CNC Parts - Injection Mold Ejector Pins

What are ejector pins used for?
The flat ejector pins are used in the ejection system of custom plastic molds to ensure that the formed parts are completely ejected, preventing product deformation or surface damage.

Pain Point Analysis:
– Right Angle Deviation: The head length reaches 155mm, and processing errors cause uneven ejection force, affecting demolding stability.
– Wear Issues: Frequent ejection operations lead to accelerated surface wear of the ejector pins, resulting in incomplete ejection or product scratches.

Solutions:
1. Precision Machining Process:
￮ Use EDM wire cutting for shaping to ensure basic dimension accuracy.
￮ Key functional areas (right-angle surface of the head) are fully ground by professional technicians to control the right-angle tolerance to ≤0.01mm.
2. Material and Heat Treatment Optimization:
￮ Material: Use SKD61 hot working tool steel (JIS standard), which has both strength and toughness.
￮ Heat Treatment: Adopt vacuum hardening and triple tempering, with hardness stably controlled at 53~56 HRC, which effectively improves wear resistance.

Effect Verification:
• Right-Angle Qualification Rate: 100% (based on ISO 2768-fH tolerance standard).
• Wear Resistance Improvement: Wear rate reduced by 37%.
• Mass Production Stability: After 100,000 consecutive ejection cycles, there are no scratches on the formed parts, and no plastic deformation of the ejector pins.