{"id":8574,"date":"2026-01-20T10:19:56","date_gmt":"2026-01-20T02:19:56","guid":{"rendered":"https:\/\/www.uneedpm.com\/?p=8574"},"modified":"2026-03-17T20:32:41","modified_gmt":"2026-03-17T12:32:41","slug":"what-is-annealed-steel-quick-guide-to-annealing-in-metal","status":"publish","type":"post","link":"https:\/\/www.uneedpm.com\/cs\/what-is-annealed-steel-quick-guide-to-annealing-in-metal\/","title":{"rendered":"Co je \u017e\u00edhan\u00e1 ocel: Co je to \u017e\u00edh\u00e1n\u00ed oceli?"},"content":{"rendered":"<p>Pokud jste n\u011bkdy zkou\u0161eli oh\u00fdbat ocel a sledovali jste, jak prask\u00e1, nebo jste obr\u00e1b\u011bli d\u00edl, kter\u00fd se po odstran\u011bn\u00ed deformoval, narazili jste na b\u011b\u017en\u00fd probl\u00e9m: ocel je pro dan\u00fd \u00fakol p\u0159\u00edli\u0161 tvrd\u00e1 nebo nam\u00e1han\u00e1. \u017d\u00edhan\u00e1 ocel tento probl\u00e9m \u0159e\u0161\u00ed. Ale co je to vlastn\u011b \u017e\u00edhan\u00e1 ocel? Je pe\u010dliv\u011b zah\u0159\u00e1t\u00e1 a pomalu ochlazen\u00e1, aby se stala m\u011bk\u010d\u00ed, tv\u00e1rn\u011bj\u0161\u00ed a l\u00e9pe se s n\u00ed pracovalo.<\/p>\n\n\n\n<p>V t\u00e9to p\u0159\u00edru\u010dce se dozv\u00edte:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Co je to \u017e\u00edhan\u00e1 ocel v jednoduch\u00e9 angli\u010dtin\u011b<\/li>\n\n\n\n<li>Jak \u017e\u00edh\u00e1n\u00ed ovliv\u0148uje tvrdost, pevnost a ta\u017enost<\/li>\n\n\n\n<li>Postupn\u00e9 \u017e\u00edh\u00e1n\u00ed<\/li>\n\n\n\n<li>Typy \u017e\u00edh\u00e1n\u00ed a jejich pou\u017eit\u00ed<\/li>\n\n\n\n<li>Jak specifikovat a ov\u011b\u0159it \u017e\u00edhanou ocel pro CNC obr\u00e1b\u011bn\u00ed, tv\u00e1\u0159en\u00ed a v\u00fdrobu?<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Co je to \u017e\u00edhan\u00e1 ocel?<\/h2>\n\n\n\n<p>\u017d\u00edhan\u00e1 ocel m\u016f\u017ee zn\u00edt odborn\u011b, ale jej\u00ed podstata je jednoduch\u00e1: jedn\u00e1 se o ocel, kter\u00e1 byla pe\u010dliv\u011b zah\u0159\u00e1t\u00e1 a ochlazen\u00e1, aby byla m\u011bk\u010d\u00ed a l\u00e9pe se s n\u00ed pracovalo. Pochopen\u00ed toho, co se d\u011bje b\u011bhem \u017e\u00edh\u00e1n\u00ed, v\u00e1m pom\u016f\u017ee pochopit, pro\u010d se zlep\u0161uje obrobitelnost, ta\u017enost a sni\u017euje nap\u011bt\u00ed a pro\u010d konstrukt\u00e9\u0159i \u010dasto vol\u00ed tuto \u00fapravu pro tv\u00e1\u0159en\u00ed, sva\u0159ov\u00e1n\u00ed nebo CNC operace.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Definice \u017e\u00edhan\u00e9 oceli v angli\u010dtin\u011b<\/h3>\n\n\n\n<p>Co znamen\u00e1 \u017e\u00edh\u00e1n\u00ed oceli? Znamen\u00e1 to, \u017ee se kov zah\u0159eje na pl\u00e1novanou teplotu, udr\u017euje se na n\u00ed dostate\u010dn\u011b dlouho, aby se zm\u011bnila jeho vnit\u0159n\u00ed struktura, a pak se pomalu ochlazuje (\u010dasto v peci) podle n\u00e1sleduj\u00edc\u00edho postupu <a href=\"https:\/\/www.iso.org\/standard\/60261.html\">ISO 60261<\/a> normy. Tento proces tepeln\u00e9ho zpracov\u00e1n\u00ed se prov\u00e1d\u00ed proto, aby se s ocel\u00ed l\u00e9pe pracovalo a aby se zlep\u0161ily vlastnosti kovu pro obr\u00e1b\u011bn\u00ed a tv\u00e1\u0159en\u00ed.<\/p>\n\n\n\n<p>Definice \u017e\u00edh\u00e1n\u00ed oceli zjednodu\u0161en\u011b odpov\u00edd\u00e1 na ot\u00e1zku: Co je to \u017e\u00edhan\u00e1 ocel? Kov zah\u0159ejeme, podr\u017e\u00edme a pomalu ochlad\u00edme, abychom jej zm\u011bk\u010dili a sn\u00ed\u017eili vnit\u0159n\u00ed pnut\u00ed. Lid\u00e9 to n\u011bkdy nespr\u00e1vn\u011b p\u00ed\u0161\u00ed jako \u017e\u00edh\u00e1n\u00ed, ale jde o stejnou my\u0161lenku: \u0159\u00edzen\u00fd tepeln\u00fd cyklus, kter\u00fd m\u011bn\u00ed strukturu oceli.<\/p>\n\n\n\n<p>P\u0159i \u017e\u00edh\u00e1n\u00ed oceli jsou tyto trendy typick\u00e9:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Zvy\u0161uje se tv\u00e1rnost (v\u00edce se oh\u00fdb\u00e1 a natahuje, ne\u017e praskne).<\/li>\n\n\n\n<li>Zvy\u0161uje se obrobitelnost (l\u00e9pe se \u0159e\u017ee, n\u00e1stroje d\u00e9le vydr\u017e\u00ed).<\/li>\n\n\n\n<li>Sni\u017euje se zbytkov\u00e9 nap\u011bt\u00ed (d\u00edly se m\u00e9n\u011b deformuj\u00ed nebo \"pru\u017e\u00ed\").<\/li>\n\n\n\n<li>Tvrdost a pevnost se sni\u017euje (m\u00e9n\u011b odol\u00e1v\u00e1 \u0159ez\u00e1n\u00ed a prom\u00e1\u010dknut\u00ed).<\/li>\n<\/ul>\n\n\n\n<p>To je kl\u00ed\u010dov\u00fd bod: \u017e\u00edh\u00e1n\u00ed je tepeln\u00e9 zpracov\u00e1n\u00ed, kter\u00e9 se pou\u017e\u00edv\u00e1, kdy\u017e pot\u0159ebujete, aby se ocel chovala \u0161etrn\u011bji p\u0159i tv\u00e1\u0159en\u00ed, sva\u0159ov\u00e1n\u00ed nebo obr\u00e1b\u011bn\u00ed.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">O\u010dek\u00e1van\u00e9 zm\u011bny nemovitost\u00ed<\/h3>\n\n\n\n<p>Mnoho lid\u00ed se pt\u00e1: \"Je \u017e\u00edhan\u00e1 ocel pevn\u011bj\u0161\u00ed nebo slab\u0161\u00ed?\" \u017d\u00edhan\u00e1 ocel je obvykle slab\u0161\u00ed ne\u017e stejn\u00e1 ocel zpracovan\u00e1 za studena, normalizovan\u00e1 nebo kalen\u00e1. To nen\u00ed z\u00e1vada - \u010dasto je to d\u016fvod, pro\u010d jste si \u017e\u00edhan\u00fd materi\u00e1l v\u016fbec vy\u017e\u00e1dali.<\/p>\n\n\n\n<p>P\u0159i poklesu tvrdosti se zlep\u0161uj\u00ed fyzik\u00e1ln\u00ed vlastnosti oceli, tak\u017ee \u0159ezn\u00e9 n\u00e1stroje maj\u00ed tendenci p\u0159estat drhnout a za\u010d\u00edt \u010dist\u011b \u0159ezat. P\u0159i obr\u00e1b\u011bn\u00ed na CNC to \u010dasto znamen\u00e1 m\u00e9n\u011b rozbit\u00fdch vrt\u00e1k\u016f, m\u00e9n\u011b chv\u011bn\u00ed p\u0159i obr\u00e1b\u011bn\u00ed. <a href=\"https:\/\/www.uneedpm.com\/cs\/cnc-milling\/\">CNC fr\u00e9zov\u00e1n\u00ed<\/a>a p\u0159edv\u00eddateln\u011bj\u0161\u00ed povrchov\u00e9 \u00fapravy v <a href=\"https:\/\/www.uneedpm.com\/cs\/cnc-turning\/\">CNC soustru\u017een\u00ed<\/a>. Kdy\u017e se zv\u00fd\u0161\u00ed ta\u017enost, lisovac\u00ed brzdy a tv\u00e1\u0159ec\u00ed formy mohou materi\u00e1l posouvat d\u00e1le bez prasklin na hran\u00e1ch.<\/p>\n\n\n\n<p>Dal\u0161\u00ed praktickou v\u00fdhrou je rozm\u011brov\u00e1 stabilita. Pokud opracov\u00e1v\u00e1te blok, kter\u00fd je pln\u00fd zablokovan\u00e9ho nap\u011bt\u00ed, m\u016f\u017ee se m\u00edrn\u011b prohnout, jakmile odstran\u00edte materi\u00e1l. \u017d\u00edh\u00e1n\u00ed (nebo leh\u010d\u00ed cyklus uvol\u0148ov\u00e1n\u00ed nap\u011bt\u00ed) m\u016f\u017ee tento \"p\u0159ekvapiv\u00fd pohyb\" omezit, co\u017e je d\u016fle\u017eit\u00e9, kdy\u017e se hon\u00edte za t\u011bsnou rovinnost\u00ed nebo p\u0159\u00edmo\u010darost\u00ed.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Zjednodu\u0161en\u00e1 mikrostruktura: co se d\u011bje uvnit\u0159 oceli<\/h3>\n\n\n\n<p>Pokud v\u00e1s zaj\u00edm\u00e1, co je \u017e\u00edhan\u00e1 ocel na \u00farovni mikrostruktury, ocel nen\u00ed jen \"jedna v\u011bc\". Uvnit\u0159 se zrna a f\u00e1ze m\u011bn\u00ed v z\u00e1vislosti na teplot\u011b a \u010dase. \u017d\u00edh\u00e1n\u00ed funguje proto, \u017ee umo\u017e\u0148uje oceli p\u0159eskupit se do stavu ni\u017e\u0161\u00edho nap\u011bt\u00ed a ni\u017e\u0161\u00ed tvrdosti.<\/p>\n\n\n\n<p>Proces \u017e\u00edh\u00e1n\u00ed kovu si lze zjednodu\u0161en\u011b p\u0159edstavit tak, \u017ee obvykle proch\u00e1z\u00ed t\u0159emi f\u00e1zemi:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Zotaven\u00ed: ocel za\u010dne sni\u017eovat vnit\u0159n\u00ed nap\u011bt\u00ed, ani\u017e by se zcela zm\u011bnila struktura zrna.<\/li>\n\n\n\n<li>Rekrystalizace: vznikaj\u00ed nov\u00e1 zrna bez deformace, kter\u00e1 nahrazuj\u00ed deformovan\u00e1 zrna vznikl\u00e1 p\u0159i pr\u00e1ci za studena.<\/li>\n\n\n\n<li>R\u016fst zrn: pokud je dr\u017e\u00edte p\u0159\u00edli\u0161 dlouho nebo p\u0159\u00edli\u0161 hork\u00e9, mohou zrna vyr\u016fst v\u011bt\u0161\u00ed, ne\u017e byste cht\u011bli.<\/li>\n<\/ul>\n\n\n\n<p>Proto je d\u016fle\u017eit\u00e9 pomal\u00e9 chlazen\u00ed a regulace teploty. Vlastnosti kov\u016f v oceli vych\u00e1zej\u00ed z jej\u00ed mikrostruktury a mikrostruktura vych\u00e1z\u00ed z pr\u016fb\u011bhu teplot.<\/p>\n\n\n\n<p>U mnoha druh\u016f uhl\u00edkov\u00fdch ocel\u00ed m\u00e1 \u00fapln\u00e9 \u017e\u00edh\u00e1n\u00ed tendenci zanechat m\u011bk\u010d\u00ed feritovou\/perlitovou strukturu s men\u0161\u00edm po\u010dtem dislokac\u00ed (m\u00e9n\u011b \"propletenc\u016f\" v krystalu). Men\u0161\u00ed po\u010det dislokac\u00ed obvykle znamen\u00e1 ni\u017e\u0161\u00ed tvrdost a snadn\u011bj\u0161\u00ed \u0159ez\u00e1n\u00ed.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Co znamen\u00e1 \"\u017e\u00edhan\u00e1\" na specifikaci oceli nebo na datov\u00e9m listu?<\/h3>\n\n\n\n<p>Ve specifikac\u00edch a certifikac\u00edch m\u016f\u017ee \"\u017e\u00edh\u00e1n\u00ed\" znamenat r\u016fzn\u00e9 c\u00edlov\u00e9 v\u00fdsledky v z\u00e1vislosti na rodin\u011b slitin a standardn\u00ed praxi dodavatele. M\u016f\u017eete se setkat s v\u00fdrazy jako \"\u017e\u00edhan\u00e9\", \"m\u011bkce \u017e\u00edhan\u00e9\", \"sf\u00e9roidn\u011b \u017e\u00edhan\u00e9\" nebo \"odleh\u010den\u00e9 od nap\u011bt\u00ed\".<\/p>\n\n\n\n<p>Praktick\u00fd z\u00e1v\u011br: kdy\u017e se v datov\u00e9m listu uv\u00e1d\u00ed \u017e\u00edh\u00e1n\u00ed, \u010dasto to znamen\u00e1 jednu nebo v\u00edce z t\u011bchto mo\u017enost\u00ed:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>c\u00edlov\u00fd rozsah tvrdosti (b\u011b\u017en\u00fd pro ty\u010dov\u00fd materi\u00e1l a n\u00e1strojov\u00e9 oceli),<\/li>\n\n\n\n<li>c\u00edlovou mikrostrukturu (b\u011b\u017enou pro sf\u00e9roidizovan\u00e9 n\u00e1strojov\u00e9 oceli),<\/li>\n\n\n\n<li>v\u00fdrobn\u00ed z\u00e1m\u011br jako \"nejlep\u0161\u00ed stav pro tv\u00e1\u0159en\u00ed\" nebo \"nejlep\u0161\u00ed stav pro obr\u00e1b\u011bn\u00ed\".<\/li>\n<\/ul>\n\n\n\n<p>Pokud je v\u00e1\u0161 d\u00edl citliv\u00fd - tenk\u00e9 st\u011bny, p\u0159\u00edsn\u00e9 tolerance, t\u011b\u017ek\u00e9 obr\u00e1b\u011bn\u00ed - nespol\u00e9hejte se pouze na slovo. Zeptejte se na rozsah tvrdosti nebo na p\u0159esnou metodu \u017e\u00edh\u00e1n\u00ed (pln\u00e9 \u017e\u00edh\u00e1n\u00ed vs. odleh\u010den\u00ed od nap\u011bt\u00ed vs. sf\u00e9roidizace).<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img fetchpriority=\"high\" decoding=\"async\" width=\"1024\" height=\"768\" src=\"https:\/\/www.uneedpm.com\/wp-content\/uploads\/2026\/01\/2-21-1024x768.webp\" alt=\"\u017e\u00edh\u00e1n\u00ed\" class=\"wp-image-8578\" srcset=\"https:\/\/www.uneedpm.com\/wp-content\/uploads\/2026\/01\/2-21-1024x768.webp 1024w, https:\/\/www.uneedpm.com\/wp-content\/uploads\/2026\/01\/2-21-300x225.webp 300w, https:\/\/www.uneedpm.com\/wp-content\/uploads\/2026\/01\/2-21-768x576.webp 768w, https:\/\/www.uneedpm.com\/wp-content\/uploads\/2026\/01\/2-21-16x12.webp 16w, https:\/\/www.uneedpm.com\/wp-content\/uploads\/2026\/01\/2-21.webp 1280w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">Proces \u017e\u00edh\u00e1n\u00ed oceli: krok za krokem<\/h2>\n\n\n\n<p>Proces \u017e\u00edh\u00e1n\u00ed oceli se m\u016f\u017ee zd\u00e1t jednoduch\u00fd - zah\u0159\u00e1t, podr\u017eet a ochladit - ale ka\u017ed\u00fd krok hraje rozhoduj\u00edc\u00ed roli p\u0159i utv\u00e1\u0159en\u00ed vlastnost\u00ed oceli. Pochopen\u00ed z\u00e1kladn\u00edho t\u0159\u00edstup\u0148ov\u00e9ho cyklu v\u00e1m pom\u016f\u017ee p\u0159edpov\u011bd\u011bt, jak se bude ocel chovat p\u0159i obr\u00e1b\u011bn\u00ed, tv\u00e1\u0159en\u00ed nebo dokon\u010dov\u00e1n\u00ed, od dosa\u017een\u00ed spr\u00e1vn\u00e9 m\u011bkkosti a ta\u017enosti a\u017e po kontrolu struktury zrna a kvality povrchu.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">T\u0159\u00edstup\u0148ov\u00fd cyklus: zah\u0159\u00e1t\u00ed, nam\u00e1\u010den\u00ed, pomal\u00e9 chlazen\u00ed<\/h3>\n\n\n\n<p>V\u011bt\u0161ina pl\u00e1n\u016f \u017e\u00edh\u00e1n\u00ed oceli je variac\u00ed stejn\u00fdch t\u0159\u00ed krok\u016f. Jedn\u00e1 se o z\u00e1kladn\u00ed postup \u017e\u00edh\u00e1n\u00ed, se kter\u00fdm se setk\u00e1te ve v\u0161ech d\u00edlensk\u00fdch postupech a norm\u00e1ch.<\/p>\n\n\n\n<ol start=\"1\" class=\"wp-block-list\">\n<li>Zah\u0159\u00e1t\u00ed: Ocel se uvede do \u0159\u00edzen\u00e9 teploty \u017e\u00edh\u00e1n\u00ed. V z\u00e1vislosti na druhu oceli m\u016f\u017ee b\u00fdt tato teplota vy\u0161\u0161\u00ed ne\u017e kritick\u00e1 (p\u0159i n\u00ed\u017e doch\u00e1z\u00ed k f\u00e1zov\u00fdm zm\u011bn\u00e1m) nebo ni\u017e\u0161\u00ed (podkritick\u00e1).<\/li>\n\n\n\n<li>Nam\u00e1\u010den\u00ed (dr\u017een\u00ed): Ocel se udr\u017euje p\u0159i teplot\u011b, aby se teplo mohlo vyrovn\u00e1vat v cel\u00e9m pr\u016f\u0159ezu a struktura se mohla m\u011bnit difuz\u00ed a rekrystalizac\u00ed.<\/li>\n\n\n\n<li>Pomal\u00e9 ochlazen\u00ed: Ocel se ochlazuje pomalu - \u010dasto v peci - aby se zabr\u00e1nilo vzniku tvrd\u0161\u00edch struktur a aby se udr\u017eelo n\u00edzk\u00e9 tepeln\u00e9 nap\u011bt\u00ed.<\/li>\n<\/ol>\n\n\n\n<p>Pr\u00e1v\u011b pomal\u00e9 ochlazov\u00e1n\u00ed odli\u0161uje mnoho \u017e\u00edh\u00e1n\u00ed od proces\u016f, jako je normalizace, kdy se k dosa\u017een\u00ed pevn\u011bj\u0161\u00ed a jemn\u011bj\u0161\u00ed struktury pou\u017e\u00edv\u00e1 ochlazov\u00e1n\u00ed vzduchem.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Kl\u00ed\u010dov\u00e9 prom\u011bnn\u00e9 procesu, kter\u00e9 ovliv\u0148uj\u00ed v\u00fdsledky<\/h3>\n\n\n\n<p>\u017d\u00edh\u00e1n\u00ed zn\u00ed jednodu\u0161e, ale v\u00fdsledky se mohou velmi li\u0161it. Z\u00e1le\u017e\u00ed na rodin\u011b oceli, tlou\u0161\u0165ce pr\u016f\u0159ezu a p\u0159edchoz\u00edm zpracov\u00e1n\u00ed.<\/p>\n\n\n\n<p>Velkou p\u00e1kou je volba teploty. N\u00edzkouhl\u00edkov\u00e9 oceli, st\u0159edn\u011b a vysoce uhl\u00edkat\u00e9 oceli, legovan\u00e9 oceli a nerezov\u00e9 oceli maj\u00ed r\u016fzn\u00e9 kritick\u00e9 rozsahy. Pokud zah\u0159ejete p\u0159\u00edli\u0161 n\u00edzkou teplotu, dojde k ne\u00fapln\u00e9mu \u017e\u00edh\u00e1n\u00ed - d\u00edl z\u016fstane tvrd\u00fd a obr\u00e1b\u011bn\u00ed je st\u00e1le \"ostr\u00e9 a chytlav\u00e9\". Pokud zah\u0159\u00edv\u00e1te p\u0159\u00edli\u0161 vysoko nebo p\u0159\u00edli\u0161 dlouho, m\u016f\u017ee r\u016fst zrn sn\u00ed\u017eit hou\u017eevnatost a zhor\u0161it v\u00fdkonnost.<\/p>\n\n\n\n<p>\u010cas p\u0159i teplot\u011b je druhou p\u00e1kou. B\u011b\u017en\u00fdm pravidlem v d\u00edln\u011b je, \u017ee siln\u011bj\u0161\u00ed d\u00edly pot\u0159ebuj\u00ed del\u0161\u00ed dobu nam\u00e1\u010den\u00ed, kter\u00e1 se n\u011bkdy popisuje jako p\u0159ibli\u017en\u011b hodina na palec tlou\u0161\u0165ky pro n\u011bkter\u00e9 cykly. Je to hrub\u00e9 vod\u00edtko, nikoli z\u00e1ruka. Geometrie d\u00edlu, velikost zat\u00ed\u017een\u00ed a typ pece jej mohou zm\u011bnit.<\/p>\n\n\n\n<p>T\u0159et\u00ed p\u00e1kou je rychlost chlazen\u00ed. Chlazen\u00ed v peci je pomal\u00e9 a obvykle vede k m\u011bk\u010d\u00edm v\u00fdsledk\u016fm. Chlazen\u00ed na vzduchu je rychlej\u0161\u00ed a m\u016f\u017ee se p\u0159ibl\u00ed\u017eit normovan\u00fdm vlastnostem v z\u00e1vislosti na oceli a p\u0159esn\u00e9m pl\u00e1nu.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Typy pec\u00ed, atmosf\u00e9ry a v\u00fdsledky povrch\u016f<\/h3>\n\n\n\n<p>\u017d\u00edh\u00e1n\u00ed se net\u00fdk\u00e1 pouze vnit\u0159n\u00edch fyzik\u00e1ln\u00edch a n\u011bkdy i chemick\u00fdch vlastnost\u00ed. M\u011bn\u00ed tak\u00e9 povrch.<\/p>\n\n\n\n<p>Pokud \u017e\u00edh\u00e1te na vzduchu, m\u016f\u017eete z\u00edskat oxidov\u00fd k\u00e1men. N\u011bkter\u00e9 oceli mohou tak\u00e9 ztr\u00e1cet uhl\u00edk na povrchu (oduhli\u010den\u00ed), co\u017e m\u016f\u017ee m\u00edt v\u00fdznam, pokud pozd\u011bji pot\u0159ebujete tvrdou slupku nebo pokud je d\u00edl dokon\u010dov\u00e1n s mal\u00fdm p\u0159\u00eddavkem materi\u00e1lu.<\/p>\n\n\n\n<p>Pokud z\u00e1le\u017e\u00ed na povrchu, m\u016f\u017ee \u0159\u00edzen\u00e1 atmosf\u00e9ra nebo vakuov\u00e1 pec pomoci sn\u00ed\u017eit tvorbu vodn\u00edho kamene a odv\u00e1pn\u011bn\u00ed. To m\u016f\u017ee pozd\u011bji u\u0161et\u0159it \u010das, pokud se sna\u017e\u00edte vyhnout t\u011b\u017ek\u00e9mu trysk\u00e1n\u00ed, mo\u0159en\u00ed nebo dodate\u010dn\u00e9mu obr\u00e1b\u011bn\u00ed materi\u00e1lu jen kv\u016fli vy\u010di\u0161t\u011bn\u00ed povrchu.<\/p>\n\n\n\n<p>Ot\u00e1zkou, kterou je vhodn\u00e9 si polo\u017eit, je: bude se jednat o \"kosmetick\u00fd\" povrch, t\u011bsnic\u00ed povrch nebo povrch citliv\u00fd na \u00fanavu? Pokud ano, m\u011bla by b\u00fdt atmosf\u00e9ra v peci a pl\u00e1n \u010di\u0161t\u011bn\u00ed po \u017e\u00edh\u00e1n\u00ed sou\u010d\u00e1st\u00ed rozhovoru, nikoliv dodate\u010dnou my\u0161lenkou.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">N\u00e1pad na odhad doby namo\u010den\u00ed (pravidlo palce, s varov\u00e1n\u00edm)<\/h3>\n\n\n\n<p>Lid\u00e9 \u010dasto cht\u011bj\u00ed rychlou kalkula\u010dku: \"M\u016fj d\u00edl m\u00e1 tlou\u0161\u0165ku 2 palce - jak dlouho m\u00e1m \u017e\u00edhat?\" Jednoduch\u00fd odhad v\u00e1m m\u016f\u017ee pomoci zah\u00e1jit diskusi, ale nem\u016f\u017ee nahradit kvalifikovan\u00e9ho tepeln\u00e9ho zpracovatele a spr\u00e1vnou normu pro danou t\u0159\u00eddu.<\/p>\n\n\n\n<p>Praktick\u00fdm zp\u016fsobem, jak pou\u017e\u00edvat pravidlo palce, je pova\u017eovat je za v\u00fdchoz\u00ed ot\u00e1zku, nikoli za n\u00e1vod: \"Jak\u00e9 nam\u00e1\u010dec\u00ed okno doporu\u010dujete pro tuto tlou\u0161\u0165ku a skupinu ocel\u00ed, abyste dos\u00e1hli c\u00edlov\u00e9 tvrdosti bez r\u016fstu zrn?\" Tato jedin\u00e1 v\u011bta m\u016f\u017ee zabr\u00e1nit mnoha p\u0159ed\u011bl\u00e1vk\u00e1m.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" width=\"1024\" height=\"768\" src=\"https:\/\/www.uneedpm.com\/wp-content\/uploads\/2026\/01\/3-20-1024x768.webp\" alt=\"Definice \u017e\u00edh\u00e1n\u00ed\" class=\"wp-image-8583\" srcset=\"https:\/\/www.uneedpm.com\/wp-content\/uploads\/2026\/01\/3-20-1024x768.webp 1024w, https:\/\/www.uneedpm.com\/wp-content\/uploads\/2026\/01\/3-20-300x225.webp 300w, https:\/\/www.uneedpm.com\/wp-content\/uploads\/2026\/01\/3-20-768x576.webp 768w, https:\/\/www.uneedpm.com\/wp-content\/uploads\/2026\/01\/3-20-16x12.webp 16w, https:\/\/www.uneedpm.com\/wp-content\/uploads\/2026\/01\/3-20.webp 1280w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">Typy \u017e\u00edh\u00e1n\u00ed oceli<\/h2>\n\n\n\n<p>Ocel lze \u017e\u00edhat v\u00edce ne\u017e jedn\u00edm zp\u016fsobem. V\u00fdb\u011br spr\u00e1vn\u00e9ho typu \u017e\u00edh\u00e1n\u00ed z\u00e1vis\u00ed na tom, jak\u00fd probl\u00e9m se sna\u017e\u00edte vy\u0159e\u0161it: obnovit ta\u017enost po pr\u00e1ci za studena, sn\u00ed\u017eit nap\u011bt\u00ed p\u0159i obr\u00e1b\u011bn\u00ed, maximalizovat m\u011bkkost nebo zlep\u0161it obrobitelnost n\u00e1strojov\u00e9 oceli.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u00dapln\u00e9 \u017e\u00edh\u00e1n\u00ed (\u00fapln\u00e9 \u017e\u00edh\u00e1n\u00ed): maxim\u00e1ln\u00ed m\u011bkkost pro mnoho uhl\u00edkov\u00fdch ocel\u00ed.<\/h3>\n\n\n\n<p>\u00dapln\u00e9 \u017e\u00edh\u00e1n\u00ed (naz\u00fdvan\u00e9 tak\u00e9 \u00fapln\u00e9 \u017e\u00edh\u00e1n\u00ed) je u mnoha uhl\u00edkov\u00fdch ocel\u00ed klasick\u00fdm zp\u016fsobem \u00fapravy \"aby byla co nejm\u011bk\u010d\u00ed\". Ocel se zah\u0159eje na teplotu, p\u0159i n\u00ed\u017e m\u016f\u017ee doj\u00edt k f\u00e1zov\u00e9 p\u0159em\u011bn\u011b, a pot\u00e9 se pomalu ochlad\u00ed.<\/p>\n\n\n\n<p>\u00dapln\u00e9 \u017e\u00edh\u00e1n\u00ed vol\u00edte tehdy, kdy\u017e chcete dos\u00e1hnout co nejv\u011bt\u0161\u00edho poklesu tvrdosti, obvykle p\u0159ed t\u011b\u017ek\u00fdm obr\u00e1b\u011bn\u00edm nebo p\u0159ed pozd\u011bj\u0161\u00edm kalen\u00edm. Je b\u011b\u017en\u00e9 u v\u00fdkovk\u016f a odlitk\u016f, kter\u00e9 pot\u0159ebuj\u00ed zjemnit strukturu a snadn\u011bji se \u0159ezat.<\/p>\n\n\n\n<p>V re\u00e1ln\u00e9m obchod\u011b je pln\u00e9 \u017e\u00edh\u00e1n\u00ed to, co po\u017eadujete, kdy\u017e chcete, aby ty\u010d nebo v\u00fdkovek p\u0159estal po\u017e\u00edrat n\u00e1stroje a za\u010dal se chovat slu\u0161n\u011b.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Procesn\u00ed \u017e\u00edh\u00e1n\u00ed \/ rekrystaliza\u010dn\u00ed \u017e\u00edh\u00e1n\u00ed (podkritick\u00e9)<\/h3>\n\n\n\n<p>Procesn\u00ed \u017e\u00edh\u00e1n\u00ed se \u010dasto pou\u017e\u00edv\u00e1 u n\u00edzkouhl\u00edkov\u00fdch ocel\u00ed po zpracov\u00e1n\u00ed za studena. Jedn\u00e1 se o podkritick\u00e9 \u017e\u00edh\u00e1n\u00ed, co\u017e znamen\u00e1, \u017ee teplota z\u016fst\u00e1v\u00e1 pod pln\u00fdm rozsahem p\u0159em\u011bny. C\u00edlem je obnovit ta\u017enost, aby ocel vydr\u017eela dal\u0161\u00ed tv\u00e1\u0159en\u00ed bez prask\u00e1n\u00ed.<\/p>\n\n\n\n<p>Pokud jste se setkali s plechem, kter\u00fd se zpo\u010d\u00e1tku oh\u00fdbal dob\u0159e a po opakovan\u00fdch kroc\u00edch tv\u00e1\u0159en\u00ed se za\u010dal \u0161t\u011bpit, je jednou z mo\u017enost\u00ed n\u00e1pravy procesn\u00ed \u017e\u00edh\u00e1n\u00ed. Pou\u017e\u00edv\u00e1 se hojn\u011b ve v\u00e1lcovac\u00edch a ta\u017en\u00fdch trat\u00edch, kde se kov tvrd\u011b opracov\u00e1v\u00e1, \u017e\u00edh\u00e1, aby se \"resetoval\", a pak se znovu opracov\u00e1v\u00e1.<\/p>\n\n\n\n<p>V t\u00e9to souvislosti m\u016f\u017eete tak\u00e9 sly\u0161et \u017e\u00edh\u00e1n\u00ed rekrystalizac\u00ed, zejm\u00e9na pokud je hlavn\u00edm z\u00e1m\u011brem nahradit deformovan\u00e1 zrna nov\u00fdmi, m\u011bk\u010d\u00edmi.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u017d\u00edh\u00e1n\u00ed s uvoln\u011bn\u00edm nap\u011bt\u00ed (\u017e\u00edh\u00e1n\u00ed s uvoln\u011bn\u00edm nap\u011bt\u00ed)<\/h3>\n\n\n\n<p>\u017d\u00edh\u00e1n\u00ed na uvoln\u011bn\u00ed nap\u011bt\u00ed se zam\u011b\u0159uje na vnit\u0159n\u00ed nap\u011bt\u00ed v kovu s minim\u00e1ln\u00edmi zm\u011bnami pevnosti a tvrdosti. Tento cyklus v\u00e1s zachr\u00e1n\u00ed, kdy\u017e se sva\u0159ovan\u00fd r\u00e1m p\u0159i obr\u00e1b\u011bn\u00ed zkrout\u00ed nebo kdy\u017e se velk\u00fd plech po \u010deln\u00edm fr\u00e9zov\u00e1n\u00ed jedn\u00e9 strany \"roz\u0161t\u00edpne\".<\/p>\n\n\n\n<p>Odleh\u010den\u00ed od nap\u011bt\u00ed se \u010dasto vol\u00ed pro sva\u0159ence, z\u00e1kladny stroj\u016f, p\u0159\u00edpravky a velk\u00e9 hrub\u011b opracovan\u00e9 d\u00edly. B\u011b\u017en\u011b se pou\u017e\u00edv\u00e1 tak\u00e9 po agresivn\u00edm obr\u00e1b\u011bn\u00ed, p\u0159i kter\u00e9m se odeb\u00edr\u00e1 velk\u00e9 mno\u017estv\u00ed materi\u00e1lu a uvol\u0148uj\u00ed se nap\u011bt\u00ed, kter\u00e1 byla zachycena p\u0159i v\u00e1lcov\u00e1n\u00ed, kov\u00e1n\u00ed nebo sva\u0159ov\u00e1n\u00ed.<\/p>\n\n\n\n<p>Pt\u00e1te-li se: \"M\u00e1 se \u017e\u00edh\u00e1n\u00ed prov\u00e1d\u011bt p\u0159ed nebo po obr\u00e1b\u011bn\u00ed?\", nab\u00edz\u00ed se u\u017eite\u010dn\u00e1 odpov\u011b\u010f: mnoho d\u00edlen nejprve hrub\u011b obr\u00e1b\u00ed, pak prov\u00e1d\u00ed \u017e\u00edh\u00e1n\u00ed pod nap\u011bt\u00edm a teprve pot\u00e9 dokon\u010duje obr\u00e1b\u011bn\u00ed. Tato posloupnost \u010dasto sni\u017euje pohyb t\u011bsn\u011b p\u0159ed z\u00e1v\u011bre\u010dn\u00fdmi pr\u016fchody kritick\u00fdmi pro toleranci.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Sf\u00e9roidizace (sf\u00e9roidiza\u010dn\u00ed \u017e\u00edh\u00e1n\u00ed) pro n\u00e1strojov\u00e9\/vysokouhl\u00edkov\u00e9 oceli<\/h3>\n\n\n\n<p>Pro oceli s vysok\u00fdm obsahem uhl\u00edku a mnoho n\u00e1strojov\u00fdch ocel\u00ed je sf\u00e9roidn\u00ed \u017e\u00edh\u00e1n\u00ed vhodnou volbou, pokud je prioritou obrobitelnost.<\/p>\n\n\n\n<p>M\u00edsto toho, aby karbidy z\u016fst\u00e1valy v dlouh\u00fdch, deskovit\u00fdch tvarech, sf\u00e9roidizace podporuje tvorbu karbid\u016f v podob\u011b mal\u00fdch zaoblen\u00fdch \u010d\u00e1stic. Zaoblen\u00e9 karbidy maj\u00ed tendenci snadn\u011bji \u0159ezat a sni\u017euj\u00ed opot\u0159eben\u00ed n\u00e1stroje. Pokud jste n\u011bkdy zkou\u0161eli vrtat n\u00e1strojovou ocel, u kter\u00e9 jste m\u011bli pocit, \u017ee se pere o ka\u017ed\u00fd milimetr, po spr\u00e1vn\u00e9m cyklu sf\u00e9roidizace obvykle pozn\u00e1te rozd\u00edl.<\/p>\n\n\n\n<p>Sf\u00e9roidizace je b\u011b\u017en\u00e1 p\u0159ed obr\u00e1b\u011bn\u00edm a p\u0159ed pozd\u011bj\u0161\u00edm kalen\u00edm, zejm\u00e9na u n\u00e1strojov\u00fdch a lo\u017eiskov\u00fdch ocel\u00ed.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Rychl\u00e9 srovn\u00e1n\u00ed typ\u016f \u017e\u00edh\u00e1n\u00ed (technick\u00e9 shrnut\u00ed)<\/h3>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th class=\"has-text-align-center\" data-align=\"center\">Typ \u017e\u00edh\u00e1n\u00ed<\/th><th class=\"has-text-align-center\" data-align=\"center\">Typick\u00e9 teplotn\u00ed p\u00e1smo (relativn\u00ed)<\/th><th class=\"has-text-align-center\" data-align=\"center\">Hlavn\u00ed c\u00edl<\/th><th class=\"has-text-align-center\" data-align=\"center\">B\u011b\u017en\u011b \u017e\u00edhan\u00e9 oceli\/v\u00fdrobky<\/th><\/tr><\/thead><tbody><tr><td class=\"has-text-align-center\" data-align=\"center\">\u00dapln\u00e9 \u017e\u00edh\u00e1n\u00ed<\/td><td class=\"has-text-align-center\" data-align=\"center\">Nad kritick\u00fdm rozsahem, pak pomal\u00e9 ochlazen\u00ed<\/td><td class=\"has-text-align-center\" data-align=\"center\">Maxim\u00e1ln\u00ed m\u011bkkost, lep\u0161\u00ed obrobitelnost<\/td><td class=\"has-text-align-center\" data-align=\"center\">Mnoho v\u00fdkovk\u016f\/odlitk\u016f z uhl\u00edkov\u00e9 oceli, ty\u010dov\u00fd materi\u00e1l p\u0159ed t\u011b\u017ek\u00fdm obr\u00e1b\u011bn\u00edm<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">Proces \/ rekrystaliza\u010dn\u00ed \u017e\u00edh\u00e1n\u00ed<\/td><td class=\"has-text-align-center\" data-align=\"center\">Pod kritick\u00fdm rozsahem<\/td><td class=\"has-text-align-center\" data-align=\"center\">Obnoven\u00ed ta\u017enosti po pr\u00e1ci za studena<\/td><td class=\"has-text-align-center\" data-align=\"center\">N\u00edzkouhl\u00edkov\u00e9 ocelov\u00e9 plechy, dr\u00e1ty, trubky p\u0159i tv\u00e1\u0159en\u00ed<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">\u017d\u00edh\u00e1n\u00ed s uvoln\u011bn\u00edm nap\u011bt\u00ed<\/td><td class=\"has-text-align-center\" data-align=\"center\">Pod transforma\u010dn\u00edm rozsahem<\/td><td class=\"has-text-align-center\" data-align=\"center\">Sn\u00ed\u017een\u00ed zbytkov\u00e9ho nap\u011bt\u00ed s minim\u00e1ln\u00ed zm\u011bnou vlastnost\u00ed<\/td><td class=\"has-text-align-center\" data-align=\"center\">Sva\u0159ence, velk\u00e9 obr\u00e1b\u011bn\u00e9 d\u00edly, p\u0159\u00edpravky, z\u00e1kladny stroj\u016f<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">\u017d\u00edh\u00e1n\u00ed sf\u00e9roid\u016f<\/td><td class=\"has-text-align-center\" data-align=\"center\">Bl\u00edzko\/pod kritickou hodnotou po del\u0161\u00ed dobu<\/td><td class=\"has-text-align-center\" data-align=\"center\">Nejlep\u0161\u00ed obrobitelnost u ocel\u00ed s vysok\u00fdm obsahem uhl\u00edku\/n\u00e1strojov\u00fdch ocel\u00ed<\/td><td class=\"has-text-align-center\" data-align=\"center\">N\u00e1strojov\u00e9 oceli a oceli s vysok\u00fdm obsahem uhl\u00edku p\u0159ed obr\u00e1b\u011bn\u00edm\/kalen\u00edm<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">Izotermick\u00e9 \/ difuzn\u00ed \u017e\u00edh\u00e1n\u00ed<\/td><td class=\"has-text-align-center\" data-align=\"center\">\u0158\u00edzen\u00e9 chlazen\u00ed\/dr\u017een\u00ed<\/td><td class=\"has-text-align-center\" data-align=\"center\">Jednotn\u00e1 struktura, homogenizace<\/td><td class=\"has-text-align-center\" data-align=\"center\">N\u011bkter\u00e9 legovan\u00e9 oceli po odlit\u00ed\/koven\u00ed<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">\u017d\u00edhan\u00e1 ocel vs. jin\u00e9 podm\u00ednky<\/h2>\n\n\n\n<p>Term\u00edny tepeln\u00e9ho zpracov\u00e1n\u00ed se zam\u011b\u0148uj\u00ed, proto\u017ee v\u0161echny zahrnuj\u00ed zah\u0159\u00edv\u00e1n\u00ed a chlazen\u00ed. Z\u00e1m\u011br je v\u0161ak odli\u0161n\u00fd a v\u00fdsledky mohou b\u00fdt velmi rozd\u00edln\u00e9.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u017d\u00edhan\u00e1 vs. normalizovan\u00e1 ocel<\/h3>\n\n\n\n<p>P\u0159i normalizaci se m\u00edsto pomal\u00e9ho chlazen\u00ed v peci obvykle pou\u017e\u00edv\u00e1 chlazen\u00ed vzduchem. Toto rychlej\u0161\u00ed ochlazov\u00e1n\u00ed m\u00e1 tendenci vytv\u00e1\u0159et jemn\u011bj\u0161\u00ed strukturu a vy\u0161\u0161\u00ed pevnost ne\u017e \u00fapln\u00e9 \u017e\u00edh\u00e1n\u00ed p\u0159i men\u0161\u00ed maxim\u00e1ln\u00ed m\u011bkkosti.<\/p>\n\n\n\n<p>Kdy tedy v\u00edt\u011bz\u00ed normalizace? Pokud pot\u0159ebujete rovnom\u011brn\u011bj\u0161\u00ed vlastnosti a lep\u0161\u00ed pevnost ne\u017e p\u0159i \u017e\u00edh\u00e1n\u00ed, ale nepot\u0159ebujete ocel co nejm\u011bk\u010d\u00ed, m\u016f\u017ee b\u00fdt normalizace lep\u0161\u00ed volbou. \u010casto se vol\u00ed v p\u0159\u00edpad\u011b, \u017ee dal\u0161\u00edm krokem je pou\u017eit\u00ed v provozu (ne t\u011b\u017ek\u00e9 tv\u00e1\u0159en\u00ed) a chcete dobrou rovnov\u00e1hu mezi pevnost\u00ed a hou\u017eevnatost\u00ed.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u017d\u00edhan\u00e9 vs. kalen\u00e9 a popou\u0161t\u011bn\u00e9 (a kalen\u00e9 oceli)<\/h3>\n\n\n\n<p>\u010cast\u00fdm nedorozum\u011bn\u00edm je: \"Jak\u00fd je rozd\u00edl mezi \u017e\u00edhanou a kalenou ocel\u00ed?\" Kalen\u00ed je opa\u010dn\u00fd sm\u011br.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Kalen\u00e1 ocel se zah\u0159eje na teplotu kalen\u00ed a pot\u00e9 se rychle ochlad\u00ed (\u010dasto olejem, vodou nebo plynem), aby se vytvo\u0159ila tvrd\u0161\u00ed struktura. Zvy\u0161uje se tvrdost a pevnost, ale z\u00e1rove\u0148 se zvy\u0161uje riziko k\u0159ehkosti.<\/li>\n\n\n\n<li>\u017d\u00edhan\u00e1 ocel se pomalu ochlazuje, aby se stala m\u011bk\u010d\u00ed a tv\u00e1rn\u011bj\u0161\u00ed.<\/li>\n<\/ul>\n\n\n\n<p>Mnoho pracovn\u00edch postup\u016f pou\u017e\u00edv\u00e1 oboj\u00ed. B\u011b\u017en\u011b se pou\u017e\u00edv\u00e1 n\u00e1sleduj\u00edc\u00ed postup: obr\u00e1b\u011bn\u00ed v \u017e\u00edhan\u00e9m stavu, pot\u00e9 kalen\u00ed (kalen\u00ed), popou\u0161t\u011bn\u00ed a nakonec dokon\u010dovac\u00ed brou\u0161en\u00ed nebo dokon\u010dovac\u00ed obr\u00e1b\u011bn\u00ed.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u017d\u00edhan\u00e1 vs. popou\u0161t\u011bn\u00e1 ocel (a \u017e\u00edh\u00e1n\u00ed a popou\u0161t\u011bn\u00ed)<\/h3>\n\n\n\n<p>Lid\u00e9 se tak\u00e9 ptaj\u00ed: \"Jak\u00fd je rozd\u00edl mezi \u017e\u00edhanou a kalenou ocel\u00ed?\" Kalen\u00ed se prov\u00e1d\u00ed po kalen\u00ed, nikoliv jako jeho n\u00e1hrada.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>C\u00edlem \u017e\u00edh\u00e1n\u00ed je zm\u011bk\u010dit a sn\u00ed\u017eit nap\u011bt\u00ed t\u00edm, \u017ee se struktura uvoln\u00ed a reformuje.<\/li>\n\n\n\n<li>C\u00edlem kalen\u00ed je sn\u00ed\u017eit k\u0159ehkost ji\u017e zakalen\u00e9 oceli p\u0159i zachov\u00e1n\u00ed u\u017eite\u010dn\u00e9 tvrdosti.<\/li>\n<\/ul>\n\n\n\n<p>Pokud d\u00edl popou\u0161t\u00edte, z\u016fstane obvykle mnohem tvrd\u0161\u00ed ne\u017e \u017e\u00edhan\u00fd d\u00edl. Pokud kalen\u00fd d\u00edl \u017e\u00edh\u00e1te (v z\u00e1vislosti na cyklu), m\u016f\u017eete kalen\u00fd stav do zna\u010dn\u00e9 m\u00edry smazat a vr\u00e1tit se zp\u011bt k m\u011bkkosti.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">P\u0159\u00edm\u00e1 srovn\u00e1vac\u00ed tabulka (p\u0159i v\u00fdb\u011bru specifikace)<\/h3>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th class=\"has-text-align-center\" data-align=\"center\">Stav<\/th><th class=\"has-text-align-center\" data-align=\"center\">V\u00fdchoz\u00ed bod<\/th><th class=\"has-text-align-center\" data-align=\"center\">Styl chlazen\u00ed<\/th><th class=\"has-text-align-center\" data-align=\"center\">Typick\u00fd v\u00fdsledek<\/th><th class=\"has-text-align-center\" data-align=\"center\">Kdy\u017e je vybr\u00e1na<\/th><\/tr><\/thead><tbody><tr><td class=\"has-text-align-center\" data-align=\"center\">\u017d\u00edhan\u00e9<\/td><td class=\"has-text-align-center\" data-align=\"center\">V\u00e1lcovan\u00e9, zpracovan\u00e9 za studena, lit\u00e9\/kovan\u00e9 nebo kalen\u00e9<\/td><td class=\"has-text-align-center\" data-align=\"center\">Pomal\u00fd (\u010dasto pec)<\/td><td class=\"has-text-align-center\" data-align=\"center\">M\u011bk\u010d\u00ed; zv\u00fd\u0161en\u00ed ta\u017enosti; sn\u00ed\u017een\u00ed zbytkov\u00e9ho nap\u011bt\u00ed<\/td><td class=\"has-text-align-center\" data-align=\"center\">Tv\u00e1\u0159en\u00ed, t\u011b\u017ek\u00e9 obr\u00e1b\u011bn\u00ed, \"m\u011bkk\u00fd\" stav dod\u00e1vky<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">Zbaven\u00ed se stresu<\/td><td class=\"has-text-align-center\" data-align=\"center\">Obvykle sva\u0159ovan\u00e9 nebo hrub\u011b opracovan\u00e9<\/td><td class=\"has-text-align-center\" data-align=\"center\">\u0158\u00edzen\u00fd, ne rychl\u00fd<\/td><td class=\"has-text-align-center\" data-align=\"center\">Sn\u00ed\u017een\u00ed nap\u011bt\u00ed; minim\u00e1ln\u00ed zm\u011bna struktury<\/td><td class=\"has-text-align-center\" data-align=\"center\">Zabr\u00e1n\u011bn\u00ed deformaci p\u0159ed dokon\u010den\u00edm obr\u00e1b\u011bn\u00ed<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">Normalizovan\u00e9<\/td><td class=\"has-text-align-center\" data-align=\"center\">\u010casto kovan\u00e9\/odl\u00e9van\u00e9\/v\u00e1lcovan\u00e9<\/td><td class=\"has-text-align-center\" data-align=\"center\">Chlazen\u00ed vzduchem<\/td><td class=\"has-text-align-center\" data-align=\"center\">Pevn\u011bj\u0161\u00ed ne\u017e \u017e\u00edhan\u00e9; rovnom\u011brn\u011bj\u0161\u00ed<\/td><td class=\"has-text-align-center\" data-align=\"center\">Vyv\u00e1\u017eenost s\u00edly a odolnosti pro v\u0161eobecn\u00e9 pou\u017eit\u00ed<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">Kalen\u00e9<\/td><td class=\"has-text-align-center\" data-align=\"center\">Austenitizace\/tvrdnut\u00ed teplem<\/td><td class=\"has-text-align-center\" data-align=\"center\">Rychl\u00e9 ochlazen\u00ed<\/td><td class=\"has-text-align-center\" data-align=\"center\">Velmi tvrd\u00fd\/pevn\u00fd, m\u016f\u017ee b\u00fdt k\u0159ehk\u00fd<\/td><td class=\"has-text-align-center\" data-align=\"center\">Kdy\u017e je pot\u0159eba tvrdost a n\u00e1sledn\u00e9 popou\u0161t\u011bn\u00ed<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">Kalen\u00e9 a temperovan\u00e9<\/td><td class=\"has-text-align-center\" data-align=\"center\">Nejprve uhasil<\/td><td class=\"has-text-align-center\" data-align=\"center\">Ochlazen\u00ed a n\u00e1sledn\u00fd oh\u0159ev<\/td><td class=\"has-text-align-center\" data-align=\"center\">Vysok\u00e1 pevnost s kontrolovanou hou\u017eevnatost\u00ed<\/td><td class=\"has-text-align-center\" data-align=\"center\">H\u0159\u00eddele, \u0161rouby, d\u00edly s vysok\u00fdm zat\u00ed\u017een\u00edm<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">Temperovan\u00e9<\/td><td class=\"has-text-align-center\" data-align=\"center\">Mus\u00ed b\u00fdt nejprve vytvrzen<\/td><td class=\"has-text-align-center\" data-align=\"center\">Po ochlazen\u00ed<\/td><td class=\"has-text-align-center\" data-align=\"center\">K\u0159ehkost se sn\u00ed\u017eila, tvrdost je st\u00e1le vysok\u00e1<\/td><td class=\"has-text-align-center\" data-align=\"center\">Zaji\u0161t\u011bn\u00ed pou\u017eitelnosti kalen\u00e9 oceli v provozu<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">Data: jak \u017e\u00edh\u00e1n\u00ed m\u011bn\u00ed vlastnosti<\/h2>\n\n\n\n<p>P\u0159esn\u00e1 \u010d\u00edsla z\u00e1vis\u00ed na t\u0159\u00edd\u011b a p\u0159edchoz\u00edm zpracov\u00e1n\u00ed, ale i tak m\u016f\u017eete pou\u017e\u00edt orienta\u010dn\u00ed rozmez\u00ed pro stanoven\u00ed o\u010dek\u00e1v\u00e1n\u00ed a lep\u0161\u00ed specifikaci n\u00e1kupu.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">P\u0159\u00edklady zm\u011bn tvrdosti podle kategorie oceli<\/h3>\n\n\n\n<p>Tvrdost je \u010dasto prvn\u00edm vod\u00edtkem v d\u00edln\u011b, \u017ee je d\u00edl skute\u010dn\u011b vy\u017e\u00edhan\u00fd.<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th class=\"has-text-align-center\" data-align=\"center\">Kategorie oceli (p\u0159\u00edklad)<\/th><th class=\"has-text-align-center\" data-align=\"center\">Stav<\/th><th class=\"has-text-align-center\" data-align=\"center\">Orienta\u010dn\u00ed tvrdost (typick\u00e9 rozsahy, z\u00e1visl\u00e9 na pl\u00e1nu)<\/th><th class=\"has-text-align-center\" data-align=\"center\">\u010ceho si v obchod\u011b v\u0161imnete<\/th><\/tr><\/thead><tbody><tr><td class=\"has-text-align-center\" data-align=\"center\">St\u0159edn\u011b uhl\u00edkat\u00e1 ocel (p\u0159\u00edklad: \u0159ada 1045)<\/td><td class=\"has-text-align-center\" data-align=\"center\">Zpracov\u00e1no vs. \u00fapln\u00e9 \u017e\u00edh\u00e1n\u00ed<\/td><td class=\"has-text-align-center\" data-align=\"center\">cca 200-250 HB a\u017e 130-170 HB<\/td><td class=\"has-text-align-center\" data-align=\"center\">Vrt\u00e1n\u00ed a soustru\u017een\u00ed je hlad\u0161\u00ed; m\u00e9n\u011b sk\u0159\u00edp\u00e1n\u00ed n\u00e1stroj\u016f<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">Legovan\u00e1 ocel \u010dasto dod\u00e1van\u00e1 jako \"m\u011bkk\u00e1\" (p\u0159\u00edklad: \u0159ada 4140)<\/td><td class=\"has-text-align-center\" data-align=\"center\">\u017d\u00edhan\u00fd\/m\u011bkk\u00fd stav<\/td><td class=\"has-text-align-center\" data-align=\"center\">\u010dasto kolem 18-22 HRC (li\u0161\u00ed se podle specifikace)<\/td><td class=\"has-text-align-center\" data-align=\"center\">Lep\u0161\u00ed hrubov\u00e1n\u00ed p\u0159i CNC fr\u00e9zov\u00e1n\u00ed a soustru\u017een\u00ed<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">N\u00e1strojov\u00e9\/vysoko-uhl\u00edkov\u00e9 oceli<\/td><td class=\"has-text-align-center\" data-align=\"center\">Sf\u00e9roidizovat \u017e\u00edhan\u00e9 vs kalen\u00e9<\/td><td class=\"has-text-align-center\" data-align=\"center\">m\u016f\u017ee klesnout z 60+ HRC kalen\u00e9 na zhruba 20-30 HRC ekvivalentn\u00ed sf\u00e9roidizovan\u00e9.<\/td><td class=\"has-text-align-center\" data-align=\"center\">Klep\u00e1n\u00ed se st\u00e1v\u00e1 realistick\u00fdm; m\u00e9n\u011b odlamov\u00e1n\u00ed hran n\u00e1stroj\u016f<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p>Nejsou to sliby, ale jsou to u\u017eite\u010dn\u00e1 o\u010dek\u00e1v\u00e1n\u00ed \"kontroly spr\u00e1vnosti\", kdy\u017e p\u0159ezkoum\u00e1v\u00e1te certifik\u00e1t nebo prov\u00e1d\u00edte vstupn\u00ed kontrolu.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Kompromisy mezi pevnost\u00ed a ta\u017enost\u00ed<\/h3>\n\n\n\n<p>\u017d\u00edh\u00e1n\u00ed obvykle sni\u017euje mez kluzu a pevnost v tahu a zvy\u0161uje prodlou\u017een\u00ed. Tento kompromis pom\u00e1h\u00e1 dv\u011bma d\u016fle\u017eit\u00fdmi zp\u016fsoby.<\/p>\n\n\n\n<p>Za prv\u00e9, \u017e\u00edh\u00e1n\u00ed zlep\u0161uje obrobitelnost, tak\u017ee se t\u0159\u00edska p\u0159i obr\u00e1b\u011bn\u00ed tvo\u0159\u00ed \u010dist\u011bji. M\u011bk\u010d\u00ed ocel m\u00e1 tendenci se sp\u00ed\u0161e smykovat ne\u017e trhat, co\u017e m\u016f\u017ee v n\u011bkter\u00fdch p\u0159\u00edpadech zlep\u0161it kvalitu povrchu a sn\u00ed\u017eit tvorbu hran. Za druh\u00e9, b\u011bhem tv\u00e1\u0159en\u00ed poskytuje vy\u0161\u0161\u00ed ta\u017enost v\u011bt\u0161\u00ed bezpe\u010dn\u00e9 okno, ne\u017e za\u010dnou vznikat trhliny na hran\u00e1ch nebo polom\u011brech ohybu.<\/p>\n\n\n\n<p>Zlep\u0161uje tedy \u017e\u00edh\u00e1n\u00ed obrobitelnost? V mnoha b\u011b\u017en\u00fdch p\u0159\u00edpadech ano - proto\u017ee sni\u017euje tvrdost, omezuje \u00fa\u010dinky kalen\u00ed a sni\u017euje pohyb zp\u016fsoben\u00fd nap\u011bt\u00edm b\u011bhem \u0159ez\u00e1n\u00ed. Ne ka\u017ed\u00e1 ocel se d\u00edky n\u011bmu st\u00e1v\u00e1 \"snadnou\", ale \u010dasto se d\u00edky n\u011bmu st\u00e1vaj\u00ed obt\u00ed\u017en\u00e9 oceli zpracovateln\u00fdmi.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Sn\u00ed\u017een\u00ed zbytkov\u00e9ho nap\u011bt\u00ed a riziko zkreslen\u00ed<\/h3>\n\n\n\n<p>Zbytkov\u00e9 nap\u011bt\u00ed je skryt\u00fd probl\u00e9m, dokud nezni\u010d\u00ed toleran\u010dn\u00ed z\u00e1sobn\u00edk. Po \u017e\u00edh\u00e1n\u00ed nebo odleh\u010den\u00ed nap\u011bt\u00ed vykazuj\u00ed d\u00edly \u010dasto men\u0161\u00ed pohyb po hrub\u00e9m obr\u00e1b\u011bn\u00ed, men\u0161\u00ed riziko prasklin p\u0159i oh\u00fdb\u00e1n\u00ed a m\u00e9n\u011b \"z\u00e1hadn\u00fdch\" kontroln\u00edch selh\u00e1n\u00ed.<\/p>\n\n\n\n<p>N\u011bkter\u00e9 zdroje uv\u00e1d\u011bj\u00ed, \u017ee o\u0161et\u0159en\u00edm odleh\u010den\u00edm nap\u011bt\u00ed lze odstranit velkou \u010d\u00e1st zbytkov\u00fdch nap\u011bt\u00ed ve svarech a odlitc\u00edch, ale p\u0159esn\u00e9 sn\u00ed\u017een\u00ed z\u00e1vis\u00ed na geometrii, teplot\u011b, \u010dase a omezen\u00ed. V praxi je d\u016fkazem v\u00fdsledek: pokud se v\u00e1\u0161 d\u00edl p\u0159estal deformovat mezi hrub\u00fdmi a dokon\u010dovac\u00edmi operacemi, o\u0161et\u0159en\u00ed splnilo sv\u016fj \u00fa\u010del.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Odstran\u00ed \u017e\u00edh\u00e1n\u00ed v\u0161echna nap\u011bt\u00ed v oceli?<\/h3>\n\n\n\n<p>Ne v\u017edy. Odleh\u010den\u00ed a pln\u00e9 \u017e\u00edh\u00e1n\u00ed mohou nap\u011bt\u00ed hodn\u011b sn\u00ed\u017eit, ale nezaru\u010duj\u00ed nulov\u00e9 nap\u011bt\u00ed v ka\u017ed\u00e9m tvaru. P\u0159echody mezi tlust\u00fdmi a tenk\u00fdmi d\u00edly, vzory svar\u016f a nerovnom\u011brn\u00e9 chlazen\u00ed mohou zanechat ur\u010dit\u00e9 nap\u011bt\u00ed.<\/p>\n\n\n\n<p>Proto mnoho d\u00edlen prov\u00e1d\u00ed ov\u011b\u0159ov\u00e1n\u00ed pomoc\u00ed kombinace kontrol: zkou\u0161ek tvrdosti, kontrol deformace po zku\u0161ebn\u00edm hrubov\u00e1n\u00ed a (u kritick\u00fdch prac\u00ed) kontroly mikrostruktury.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Aplikace a p\u0159\u00edklady z praxe (obr\u00e1b\u011bn\u00ed, tv\u00e1\u0159en\u00ed, nerezov\u00e9 p\u00e1sy)<\/h2>\n\n\n\n<p>\u017d\u00edhan\u00e1 ocel nen\u00ed jen laboratorn\u00ed koncept - objevuje se v re\u00e1ln\u00fdch pracovn\u00edch postupech od CNC obr\u00e1b\u011bn\u00ed a\u017e po tv\u00e1\u0159en\u00ed plech\u016f a v\u00fdrobu, zejm\u00e9na p\u0159i pr\u00e1ci se slo\u017eit\u00fdmi kovov\u00fdmi d\u00edly. Pochopen\u00ed toho, jak \u017e\u00edh\u00e1n\u00ed ovliv\u0148uje ta\u017enost, nap\u011bt\u00ed a obrobitelnost, pom\u00e1h\u00e1 vysv\u011btlit, pro\u010d d\u00edlny nejprve hrub\u011b opracov\u00e1vaj\u00ed d\u00edly, \u017e\u00edhaj\u00ed kov kv\u016fli tvarovatelnosti a pou\u017e\u00edvaj\u00ed cykly uvol\u0148ov\u00e1n\u00ed nap\u011bt\u00ed, aby udr\u017eely stabilitu sva\u0159ovan\u00fdch konstrukc\u00ed. Tyto p\u0159\u00edklady ukazuj\u00ed, pro\u010d je \u017e\u00edh\u00e1n\u00ed \u010dasto praktick\u00fdm v\u00fdchoz\u00edm bodem p\u0159i v\u00fdrob\u011b a zpracov\u00e1n\u00ed.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Pracovn\u00ed postup CNC obr\u00e1b\u011bn\u00ed: hrubov\u00e1n\u00ed v \u017e\u00edhan\u00e9m stavu \u2192 tepeln\u00e9 zpracov\u00e1n\u00ed \u2192 dokon\u010dovac\u00ed pr\u00e1ce<\/h3>\n\n\n\n<p>Pokud jste n\u011bkdy pracovali s d\u00edly s \u00fazkou toleranc\u00ed, pravd\u011bpodobn\u011b jste se s t\u00edmto vzorem setkali. Za\u010d\u00edn\u00e1te s \u017e\u00edhanou ocel\u00ed, hrubujete kapsy a profily, pos\u00edl\u00e1te d\u00edl na tepeln\u00e9 zpracov\u00e1n\u00ed pro kone\u010dnou pevnost (\u010dasto kalen\u00ed a popou\u0161t\u011bn\u00ed) a pak se vrac\u00edte na dokon\u010dovac\u00ed \u0159ezy nebo brou\u0161en\u00ed.<\/p>\n\n\n\n<p>Pro\u010d to d\u011blat t\u00edmto zp\u016fsobem? Proto\u017ee obr\u00e1b\u011bn\u00ed pln\u011b zakalen\u00e9ho d\u00edlu je pomalej\u0161\u00ed, n\u00e1klady na n\u00e1stroje jsou vy\u0161\u0161\u00ed a riziko od\u0161t\u00edpnut\u00ed n\u00e1stroj\u016f rychle roste. Hrub\u00fdm obr\u00e1b\u011bn\u00edm v \u017e\u00edhan\u00e9m stavu chr\u00e1n\u00edte n\u00e1stroje a udr\u017eujete rozumnou dobu cyklu. Kalen\u00ed pak prov\u00e1d\u00edte a\u017e po odstran\u011bn\u00ed objemov\u00e9ho materi\u00e1lu.<\/p>\n\n\n\n<p>Mnohokr\u00e1t jsem se setkal se situac\u00ed, kdy tenkost\u011bnn\u00e1 kapsa vypad\u00e1 na stroji v po\u0159\u00e1dku, ale p\u0159i kontrole se pohybuje. Po p\u0159echodu na sekvenci hrubov\u00e1n\u00ed \u2192 odleh\u010dov\u00e1n\u00ed nap\u011bt\u00ed \u2192 dokon\u010dovac\u00ed obr\u00e1b\u011bn\u00ed se \u010dasto poda\u0159\u00ed zachovat stejnou geometrii s men\u0161\u00edm po\u010dtem p\u0159ekvapen\u00ed.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" width=\"1024\" height=\"768\" src=\"https:\/\/www.uneedpm.com\/wp-content\/uploads\/2026\/01\/4-20-1024x768.webp\" alt=\"co je \u017e\u00edh\u00e1n\u00ed\" class=\"wp-image-8584\" srcset=\"https:\/\/www.uneedpm.com\/wp-content\/uploads\/2026\/01\/4-20-1024x768.webp 1024w, https:\/\/www.uneedpm.com\/wp-content\/uploads\/2026\/01\/4-20-300x225.webp 300w, https:\/\/www.uneedpm.com\/wp-content\/uploads\/2026\/01\/4-20-768x576.webp 768w, https:\/\/www.uneedpm.com\/wp-content\/uploads\/2026\/01\/4-20-16x12.webp 16w, https:\/\/www.uneedpm.com\/wp-content\/uploads\/2026\/01\/4-20.webp 1280w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\">Tv\u00e1\u0159en\u00ed a v\u00fdroba plech\u016f\/prou\u017ek\u016f: pro\u010d \u017e\u00edhan\u00e9 stavy umo\u017e\u0148uj\u00ed velk\u00e9 redukce<\/h3>\n\n\n\n<p>Zpracov\u00e1n\u00ed za studena zvy\u0161uje pevnost, ale sni\u017euje ta\u017enost. U plech\u016f a p\u00e1s\u016f se toho vyu\u017e\u00edv\u00e1 st\u0159\u00edd\u00e1n\u00edm zpracov\u00e1n\u00ed za studena a \u017e\u00edh\u00e1n\u00ed.<\/p>\n\n\n\n<p>Ocel se v\u00e1lcuje st\u00e1le ten\u010d\u00ed, dokud neza\u010dne ztr\u00e1cet tv\u00e1\u0159itelnost. Pak se \u017e\u00edh\u00e1, aby se obnovila ta\u017enost, a pokra\u010duje se ve v\u00e1lcov\u00e1n\u00ed. To je jeden z d\u016fvod\u016f, pro\u010d je \u017e\u00edhan\u00fd (nebo \"svitkov\u00fd \u017e\u00edhan\u00fd\") materi\u00e1l tak d\u016fle\u017eit\u00fd v dodavatelsk\u00fdch \u0159et\u011bzc\u00edch plech\u016f.<\/p>\n\n\n\n<p>Stejn\u00e1 my\u0161lenka plat\u00ed i ve v\u00fdrobn\u00edm z\u00e1vod\u011b. Pokud pot\u0159ebujete t\u011bsn\u00e9 ohyby, hlubok\u00e9 tahy nebo v\u00edce tv\u00e1\u0159ec\u00edch z\u00e1sah\u016f, je \u017e\u00edhan\u00fd kov \u010dasto bezpe\u010dn\u011bj\u0161\u00edm v\u00fdchoz\u00edm bodem ne\u017e kalen\u00fd materi\u00e1l.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Sva\u0159ov\u00e1n\u00ed a v\u00fdroba: \u017e\u00edh\u00e1n\u00ed za \u00fa\u010delem sn\u00ed\u017een\u00ed nap\u011bt\u00ed a kontroly deformace<\/h3>\n\n\n\n<p>Velk\u00e9 sva\u0159ovan\u00e9 r\u00e1my mohou b\u00fdt vystaveny obrovsk\u00e9mu nam\u00e1h\u00e1n\u00ed. Nemus\u00edte to vid\u011bt, dokud neobrob\u00edte referen\u010dn\u00ed plochu, a pak se d\u00edl t\u00e1hne jako ban\u00e1n.<\/p>\n\n\n\n<p>\u017d\u00edh\u00e1n\u00ed na uvoln\u011bn\u00ed nap\u011bt\u00ed se \u010dasto pou\u017e\u00edv\u00e1 p\u0159ed kone\u010dn\u00fdm obr\u00e1b\u011bn\u00edm sva\u0159enc\u016f a t\u011b\u017ek\u00fdch v\u00fdrobk\u016f. Pom\u00e1h\u00e1 tak\u00e9 zabr\u00e1nit pohyb\u016fm b\u011bhem provozu, zejm\u00e9na u d\u00edl\u016f, u nich\u017e doch\u00e1z\u00ed k v\u00fdkyv\u016fm teplot nebo vibrac\u00edm.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">M\u016f\u017ee b\u00fdt \u017e\u00edhan\u00e1 ocel pozd\u011bji znovu kalena?<\/h3>\n\n\n\n<p>\u010casto ano. Mnoho ocel\u00ed se \u017e\u00edh\u00e1 jako v\u00fdchoz\u00ed stav a pozd\u011bji se kal\u00ed kalen\u00edm a popou\u0161t\u011bn\u00edm. Limitem je chemie: n\u011bkter\u00e9 oceli nejsou kaliteln\u00e9 stejn\u00fdm zp\u016fsobem a rodiny nerezov\u00fdch ocel\u00ed se chovaj\u00ed odli\u0161n\u011b. Nap\u0159\u00edklad n\u011bkter\u00e9 nerezov\u00e9 oceli se kal\u00ed tepeln\u00fdm zpracov\u00e1n\u00edm, zat\u00edmco jin\u00e9 ne, a n\u011bkter\u00e9 z\u00edsk\u00e1vaj\u00ed pevnost p\u0159edev\u0161\u00edm zpracov\u00e1n\u00edm za studena. Bezpe\u010dn\u00fdm krokem je potvrdit si rodinu t\u0159\u00eddy a zam\u00fd\u0161len\u00fd zp\u016fsob kalen\u00ed d\u0159\u00edve, ne\u017e budete p\u0159edpokl\u00e1dat, \u017ee se bude kalit pozd\u011bji.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Specifikace, n\u00e1kup a pozn\u00e1mky k v\u00fdkres\u016fm (jak po\u017eadovat \u017e\u00edhanou ocel)<\/h2>\n\n\n\n<p>P\u0159i n\u00e1kupu oceli je kl\u00ed\u010dovou ot\u00e1zkou, co je to \u017e\u00edhan\u00e1 ocel a jak by m\u011bla b\u00fdt specifikov\u00e1na? Spr\u00e1vn\u00e1 specifikace \u017e\u00edhan\u00e9 oceli je stejn\u011b d\u016fle\u017eit\u00e1 jako v\u00fdb\u011br spr\u00e1vn\u00e9 jakosti. A\u0165 u\u017e se jedn\u00e1 o obr\u00e1b\u011bn\u00ed, tv\u00e1\u0159en\u00ed nebo sva\u0159ovan\u00e9 sestavy, jasn\u00e9 pokyny t\u00fdkaj\u00edc\u00ed se typu \u017e\u00edh\u00e1n\u00ed, c\u00edlov\u00e9 tvrdosti a o\u010dek\u00e1van\u00e9ho povrchu v\u00e1m zajist\u00ed, \u017ee z\u00edsk\u00e1te ocel, kter\u00e1 bude fungovat tak, jak m\u00e1. Pochopen\u00ed toho, co je t\u0159eba zahrnout do popt\u00e1vkov\u00fdch list\u016f a v\u00fdkres\u016f, pom\u00e1h\u00e1 p\u0159edch\u00e1zet zpo\u017ed\u011bn\u00edm, zmetk\u016fm a n\u00e1kladn\u00fdm p\u0159ekvapen\u00edm ve v\u00fdrob\u011b.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Jak spr\u00e1vn\u011b specifikovat \u017e\u00edhanou ocel (kontroln\u00ed seznam RFQ\/v\u00fdkres\u016f)<\/h3>\n\n\n\n<p>Koupit \"ocel\" nen\u00ed tot\u00e9\u017e jako koupit \u017e\u00edhanou ocel. Pokud v\u00e1m z\u00e1le\u017e\u00ed na obr\u00e1b\u011bn\u00ed, tv\u00e1\u0159en\u00ed nebo stabilit\u011b, mus\u00edte po\u017eadavek napsat jasn\u011b.<\/p>\n\n\n\n<p>V popt\u00e1vce nebo pozn\u00e1mce k v\u00fdkresu uve\u010fte t\u0159\u00eddu oceli a pot\u00e9 p\u0159idejte \u00fadaje o podm\u00ednk\u00e1ch dod\u00e1vky. Neju\u017eite\u010dn\u011bj\u0161\u00edmi polo\u017ekami jsou typ \u017e\u00edh\u00e1n\u00ed a c\u00edlov\u00e1 tvrdost.<\/p>\n\n\n\n<p>Jasn\u00e1 \u017e\u00e1dost obvykle obsahuje:<\/p>\n\n\n\n<ol start=\"1\" class=\"wp-block-list\">\n<li>T\u0159\u00edda oceli \/ standardn\u00ed ozna\u010den\u00ed<\/li>\n\n\n\n<li>Stav: \u017e\u00edhan\u00e9, m\u011bkce \u017e\u00edhan\u00e9, sf\u00e9roidn\u011b \u017e\u00edhan\u00e9 nebo odleh\u010den\u00e9 od nap\u011bt\u00ed<\/li>\n\n\n\n<li>C\u00edlov\u00e1 tvrdost nebo rozsah tvrdosti (pokud je to vhodn\u00e9)<\/li>\n\n\n\n<li>Po\u017eadavky na certifikaci (protokol o zkou\u0161ce, sledovatelnost tepla\/parcely)<\/li>\n\n\n\n<li>O\u010dek\u00e1van\u00fd povrch (povolen\u00e1 stupnice nebo nutn\u00e1 ochrann\u00e1 atmosf\u00e9ra)<\/li>\n\n\n\n<li>P\u0159\u00edsp\u011bvek na obr\u00e1b\u011bn\u00ed, pokud se o\u010dek\u00e1v\u00e1 odv\u00e1pn\u011bn\u00ed nebo odstran\u011bn\u00ed vodn\u00edho kamene<\/li>\n<\/ol>\n\n\n\n<p>Posledn\u00ed bod lze snadno p\u0159ehl\u00e9dnout. Pokud pot\u0159ebujete \u010dist\u00fd povrch a \u017e\u00edh\u00e1te na vzduchu, m\u016f\u017eete pot\u0159ebovat dal\u0161\u00ed z\u00e1soby na \u010di\u0161t\u011bn\u00ed.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">D\u016fsledky pro n\u00e1klady, dobu realizace a dostupnost<\/h3>\n\n\n\n<p>\u017d\u00edh\u00e1n\u00ed prodlu\u017euje dobu pece, manipulaci a n\u011bkdy i kontrolu atmosf\u00e9ry. To m\u016f\u017ee prodlou\u017eit dobu p\u0159\u00edpravy, zejm\u00e9na v n\u00e1ro\u010dn\u00fdch term\u00ednech tepeln\u00e9ho zpracov\u00e1n\u00ed nebo v p\u0159\u00edpadech, kdy je vy\u017eadov\u00e1na ochrann\u00e1 atmosf\u00e9ra.<\/p>\n\n\n\n<p>P\u0159esto n\u00e1klady netvo\u0159\u00ed pouze polo\u017eka tepeln\u00e9ho zpracov\u00e1n\u00ed. Pokud \u017e\u00edh\u00e1n\u00ed sn\u00ed\u017e\u00ed zmetkovitost, sn\u00ed\u017e\u00ed spot\u0159ebu n\u00e1stroj\u016f a omez\u00ed p\u0159epracov\u00e1n\u00ed z d\u016fvodu deformace, m\u016f\u017ee sn\u00ed\u017eit celkov\u00e9 n\u00e1klady na pr\u00e1ci. Mnoho d\u00edlen to zjist\u00ed pot\u00e9, co t\u00fddny bojuj\u00ed s jedn\u00edm \u010d\u00edslem d\u00edlu a pak si uv\u011bdom\u00ed, \u017ee probl\u00e9mem byl po\u010d\u00e1te\u010dn\u00ed stav.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Jak zjist\u00edte, zda je ocel \u017e\u00edhan\u00e1?<\/h3>\n\n\n\n<p>Vzhled nen\u00ed spolehliv\u00fdm ukazatelem. \u0160upiny se mohou objevit u mnoha o\u0161et\u0159en\u00ed a sv\u011btl\u00e9 povrchy mohou poch\u00e1zet z \u0159\u00edzen\u00e9 atmosf\u00e9ry.<\/p>\n\n\n\n<p>Praktick\u00e9 kontroly jsou n\u00e1sleduj\u00edc\u00ed:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>p\u0159ezkoumejte osv\u011bd\u010den\u00ed o uveden\u00e9m stavu,<\/li>\n\n\n\n<li>prov\u00e9st zkou\u0161ku tvrdosti (Rockwell nebo Brinell),<\/li>\n\n\n\n<li>a v\u011bnujte pozornost chov\u00e1n\u00ed p\u0159i obr\u00e1b\u011bn\u00ed b\u011bhem kontrolovan\u00e9ho zku\u0161ebn\u00edho \u0159ezu.<\/li>\n<\/ul>\n\n\n\n<p>Pokud p\u0159ij\u00edm\u00e1te ocel do v\u00fdroby, vstupn\u00ed kontrola tvrdosti m\u016f\u017ee zabr\u00e1nit tomu, aby se ke stroj\u016fm dostala drah\u00e1 \u0161ar\u017ee \"ve \u0161patn\u00e9m stavu\".<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"768\" src=\"https:\/\/www.uneedpm.com\/wp-content\/uploads\/2026\/01\/5-14-1024x768.webp\" alt=\"proces \u017e\u00edh\u00e1n\u00ed\" class=\"wp-image-8585\" srcset=\"https:\/\/www.uneedpm.com\/wp-content\/uploads\/2026\/01\/5-14-1024x768.webp 1024w, https:\/\/www.uneedpm.com\/wp-content\/uploads\/2026\/01\/5-14-300x225.webp 300w, https:\/\/www.uneedpm.com\/wp-content\/uploads\/2026\/01\/5-14-768x576.webp 768w, https:\/\/www.uneedpm.com\/wp-content\/uploads\/2026\/01\/5-14-16x12.webp 16w, https:\/\/www.uneedpm.com\/wp-content\/uploads\/2026\/01\/5-14.webp 1280w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">Kontrola kvality, rizika a \u0159e\u0161en\u00ed probl\u00e9m\u016f s \u017e\u00edhanou ocel\u00ed<\/h2>\n\n\n\n<p>P\u0159esto\u017ee \u017e\u00edh\u00e1n\u00ed zlep\u0161uje obrobitelnost a sni\u017euje nap\u011bt\u00ed, nen\u00ed to proces, kter\u00fd se d\u00e1 nastavit a zapomenout. Spr\u00e1vn\u00e1 kontrola kvality - v\u010detn\u011b ov\u011b\u0159en\u00ed tvrdosti, kontroly mikrostruktury a zku\u0161ebn\u00edho obr\u00e1b\u011bn\u00ed - pom\u00e1h\u00e1 v\u010das odhalit probl\u00e9my s nedostate\u010dn\u00fdm nebo nadm\u011brn\u00fdm \u017e\u00edh\u00e1n\u00edm. Pochopen\u00ed b\u011b\u017en\u00fdch rizik a metod \u0159e\u0161en\u00ed probl\u00e9m\u016f zajist\u00ed, \u017ee \u017e\u00edhan\u00e1 ocel bude ve v\u00fdrob\u011b spolehliv\u011b fungovat a zabr\u00e1n\u00ed n\u00e1kladn\u00fdm p\u0159ekvapen\u00edm.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Metody ov\u011b\u0159ov\u00e1n\u00ed: zkou\u0161ky tvrdosti + kontroly mikrostruktury<\/h3>\n\n\n\n<p>Pro v\u011bt\u0161inu obecn\u00fdch prac\u00ed se pou\u017e\u00edv\u00e1 ov\u011b\u0159en\u00ed tvrdosti, proto\u017ee je rychl\u00e9 a p\u0159\u00edmo souvis\u00ed s o\u010dek\u00e1vanou obrobitelnost\u00ed.<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th class=\"has-text-align-center\" data-align=\"center\">Kontroln\u00ed metoda<\/th><th class=\"has-text-align-center\" data-align=\"center\">Co potvrzuje<\/th><th class=\"has-text-align-center\" data-align=\"center\">Kdy ji pou\u017e\u00edt<\/th><\/tr><\/thead><tbody><tr><td class=\"has-text-align-center\" data-align=\"center\">Tvrdost podle Rockwella<\/td><td class=\"has-text-align-center\" data-align=\"center\">Rychl\u00fd pr\u016fchod\/nepr\u016fchod vs c\u00edlov\u00fd rozsah<\/td><td class=\"has-text-align-center\" data-align=\"center\">Vstupn\u00ed kontrola, ov\u011b\u0159en\u00ed v d\u00edln\u011b<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">Tvrdost podle Brinella<\/td><td class=\"has-text-align-center\" data-align=\"center\">Vhodn\u00e9 pro m\u011bk\u010d\u00ed oceli a hromadn\u00e9 kontroly<\/td><td class=\"has-text-align-center\" data-align=\"center\">St\u0159edn\u011b uhl\u00edkat\u00e9 oceli, v\u00fdkovky, siln\u011bj\u0161\u00ed profily<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">Zkoum\u00e1n\u00ed mikrostruktury<\/td><td class=\"has-text-align-center\" data-align=\"center\">Potvrzuje strukturn\u00ed c\u00edle (nap\u0159. sf\u00e9roidn\u00ed karbidy).<\/td><td class=\"has-text-align-center\" data-align=\"center\">N\u00e1strojov\u00e9 oceli, kritick\u00e9 \u00fanavov\u00e9 d\u00edly, vy\u0161et\u0159ov\u00e1n\u00ed poruch<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">Kontrola pohybu rozm\u011br\u016f (zku\u0161ebn\u00ed hrubov\u00e1n\u00ed)<\/td><td class=\"has-text-align-center\" data-align=\"center\">Potvrzuje stav nap\u011bt\u00ed v re\u00e1ln\u00e9 geometrii<\/td><td class=\"has-text-align-center\" data-align=\"center\">D\u00edly s \u00fazkou toleranc\u00ed, tenk\u00e9 st\u011bny, velk\u00e9 desky<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\">B\u011b\u017en\u00e9 probl\u00e9my a jejich projevy<\/h3>\n\n\n\n<p>Nedostate\u010dn\u00e9 \u017e\u00edh\u00e1n\u00ed se projevuje jako ocel, kter\u00e1 je st\u00e1le p\u0159\u00edli\u0161 tvrd\u00e1. To poc\u00edt\u00edte p\u0159i obr\u00e1b\u011bn\u00ed: n\u00e1stroje se rychle opot\u0159ebov\u00e1vaj\u00ed, vrt\u00e1n\u00ed je pomal\u00e9, z\u00e1vitov\u00fd moment prudce roste a tv\u00e1\u0159en\u00e9 hrany brzy praskaj\u00ed.<\/p>\n\n\n\n<p>P\u0159e\u017ehaven\u00ed se projevuje jinak. Ocel m\u016f\u017ee b\u00fdt m\u011bkk\u00e1, ale r\u016fst zrn m\u016f\u017ee sn\u00ed\u017eit hou\u017eevnatost a zp\u016fsobit nerovnom\u011brnost v\u00fdkonu. Pokud d\u00edl, kter\u00fd \"by m\u011bl b\u00fdt v po\u0159\u00e1dku\", za\u010dne selh\u00e1vat n\u00e1razov\u011b nebo vykazuje nekonzistentn\u00ed chov\u00e1n\u00ed v r\u016fzn\u00fdch s\u00e9ri\u00edch, m\u016f\u017ee to b\u00fdt sou\u010d\u00e1st\u00ed hlavn\u00ed p\u0159\u00ed\u010diny.<\/p>\n\n\n\n<p>\u010cast\u00e9 jsou tak\u00e9 probl\u00e9my s povrchem. Oxida\u010dn\u00ed okuj\u00ed m\u016f\u017ee zni\u010dit pl\u00e1ny povrchov\u00e9 \u00fapravy a oduhli\u010den\u00ed m\u016f\u017ee zp\u016fsobit m\u011bkk\u00e9 povrchov\u00e9 vrstvy, kter\u00e9 jsou ne\u017e\u00e1douc\u00ed, pokud je t\u0159eba povrch pozd\u011bji kalit nebo p\u0159en\u00e1\u0161et zat\u00ed\u017een\u00ed.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Nev\u00fdhody \u017e\u00edh\u00e1n\u00ed (co se m\u016f\u017ee pokazit)<\/h3>\n\n\n\n<p>Lid\u00e9 se \u010dasto ptaj\u00ed p\u0159\u00edmo: jak\u00e9 jsou nev\u00fdhody \u017e\u00edh\u00e1n\u00ed? Ty hlavn\u00ed jsou praktick\u00e9:<\/p>\n\n\n\n<p>\u017d\u00edh\u00e1n\u00ed vy\u017eaduje \u010das a energii, tak\u017ee zvy\u0161uje n\u00e1klady na proces a dobu p\u0159\u00edpravy. Pokud se prov\u00e1d\u00ed na vzduchu, m\u016f\u017ee tak\u00e9 zp\u016fsobit usazov\u00e1n\u00ed a odv\u00e1p\u0148ov\u00e1n\u00ed povrchu, co\u017e si m\u016f\u017ee vynutit dodate\u010dn\u00e9 \u010distic\u00ed obr\u00e1b\u011bn\u00ed. Pokud nen\u00ed cyklus \u0159\u00edzen, m\u016f\u017ee v\u00e9st k hrubnut\u00ed zrn (r\u016fstu zrn), co\u017e m\u016f\u017ee po\u0161kodit hou\u017eevnatost. A proto\u017ee \u017e\u00edh\u00e1n\u00ed sni\u017euje tvrdost a pevnost, m\u016f\u017ee b\u00fdt nevhodn\u00fdm kone\u010dn\u00fdm stavem pro d\u00edly, kter\u00e9 mus\u00ed n\u00e9st vysok\u00e9 zat\u00ed\u017een\u00ed bez pozd\u011bj\u0161\u00edho tepeln\u00e9ho zpracov\u00e1n\u00ed.<\/p>\n\n\n\n<p>\u017d\u00edh\u00e1n\u00ed \u0159e\u0161\u00ed skute\u010dn\u00e9 probl\u00e9my, ale nen\u00ed \"zadarmo\" a ne v\u017edy je to spr\u00e1vn\u00fd kone\u010dn\u00fd stav.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Praktick\u00e9 poznatky (shrnut\u00ed)<\/h3>\n\n\n\n<p>Kdy\u017e se rozhodujete, zda koupit nebo pou\u017e\u00edt \u017e\u00edhan\u00fd materi\u00e1l, je dobr\u00e9 se zeptat: Co je to \u017e\u00edhan\u00e1 ocel a vy\u0159e\u0161\u00ed va\u0161e probl\u00e9my s obr\u00e1b\u011bn\u00edm nebo tv\u00e1\u0159en\u00edm? Pom\u016f\u017ee v\u00e1m jednoduch\u00fd kontroln\u00ed seznam. Sna\u017e\u00edte se zastavit prask\u00e1n\u00ed p\u0159i tv\u00e1\u0159en\u00ed, sn\u00ed\u017eit opot\u0159eben\u00ed n\u00e1stroj\u016f p\u0159i obr\u00e1b\u011bn\u00ed nebo omezit deformace zp\u016fsoben\u00e9 vnit\u0159n\u00edm pnut\u00edm? Pokud ano, \u017e\u00edh\u00e1n\u00ed nebo sni\u017eov\u00e1n\u00ed nap\u011bt\u00ed je \u010dasto na kr\u00e1tk\u00e9m seznamu.<\/p>\n\n\n\n<p>Kdy\u017e zad\u00e1v\u00e1te \u017e\u00edhanou ocel, nezastavujte se u slova \"\u017e\u00edhan\u00e1\". Pokud je to mo\u017en\u00e9, uve\u010fte typ \u017e\u00edh\u00e1n\u00ed a c\u00edlov\u00fd rozsah tvrdosti. Pot\u00e9 ov\u011b\u0159te pomoc\u00ed kontrol tvrdosti a v p\u0159\u00edpad\u011b pot\u0159eby pomoc\u00ed kontrol mikrostruktury nebo kontroly pohybu.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Nej\u010dast\u011bj\u0161\u00ed dotazy<\/h2>\n\n\n\n\n\n<h2 class=\"wp-block-heading\">Odkaz<\/h2>\n\n\n\n<p><a href=\"https:\/\/www.iso.org\/standard\/60261.html\">https:\/\/www.iso.org\/standard\/60261.html<\/a><\/p>\n\n\n\n<p><\/p>","protected":false},"excerpt":{"rendered":"<p>If you\u2019ve ever tried bending steel and watched it crack, or machined a part that warped after removal, you\u2019ve hit a common problem: the steel is too hard or stressed for the task. Annealed steel solves this. But what is annealed steel, exactly? It\u2019s carefully heated and slowly cooled to become softer, more ductile, and [&hellip;]<\/p>\n","protected":false},"author":7,"featured_media":8577,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_seopress_robots_primary_cat":"none","_seopress_titles_title":"","_seopress_titles_desc":"Discover what is annealed steel and how annealing metal improves ductility, reduces internal stress, and enhances machinability. Learn the step-by-step annealing process, types of annealed steel, and why engineers choose it for CNC machining, forming, and fabrication.","_seopress_robots_index":"","_daim_seo_power":"","_daim_enable_ail":"","footnotes":""},"categories":[1],"tags":[],"class_list":["post-8574","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog"],"acf":[],"_links":{"self":[{"href":"https:\/\/www.uneedpm.com\/cs\/wp-json\/wp\/v2\/posts\/8574","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.uneedpm.com\/cs\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.uneedpm.com\/cs\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.uneedpm.com\/cs\/wp-json\/wp\/v2\/users\/7"}],"replies":[{"embeddable":true,"href":"https:\/\/www.uneedpm.com\/cs\/wp-json\/wp\/v2\/comments?post=8574"}],"version-history":[{"count":1,"href":"https:\/\/www.uneedpm.com\/cs\/wp-json\/wp\/v2\/posts\/8574\/revisions"}],"predecessor-version":[{"id":8586,"href":"https:\/\/www.uneedpm.com\/cs\/wp-json\/wp\/v2\/posts\/8574\/revisions\/8586"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.uneedpm.com\/cs\/wp-json\/wp\/v2\/media\/8577"}],"wp:attachment":[{"href":"https:\/\/www.uneedpm.com\/cs\/wp-json\/wp\/v2\/media?parent=8574"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.uneedpm.com\/cs\/wp-json\/wp\/v2\/categories?post=8574"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.uneedpm.com\/cs\/wp-json\/wp\/v2\/tags?post=8574"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}