一、 The reason why the mold is out of stock and broken

• The toughness of the release pin is insufficient
• The root corner R of the demoulding pin is incomplete.

二、 Associated knowledge

• The demolding pin hole is related to the position of the lock mold screw on the mold, so the demoulding pin is both thin and long, easy to bend, and easy to break due to the molding pressure, so this kind of pin must be heat treated to have both very toughness and a certain hardness.
• Since the stress concentration of the pin is mostly concentrated at the corner R of the root, if there is damage in this part during processing, it is common for the release pin to break due to the stress concentration here.

三、Solution

• Demoulding pins are heat treated.

四、 Due to the difference in materials

• There is no particular reason

五、References

• Usually the mold should have spare parts for the release pin.