The mold platen hardness is 55-58 HRC, and the mold frame hardness is 58-62 HRC. Why is the platen hardness lower than the mold frame hardness?

A: Because if the hardness is the same, wear will occur simultaneously. The lower platen hardness protects the mold frame, reducing the cost of replacing the platen. Also, after a period of use, the mold frame's internal cavity will expand. When replacing the platen, a larger platen can be used to eliminate burrs.