What are the problems with the heat treatment of plastic molds

What are the problems with heat treatment of plastic molds?

Die heat treatment is an important means to improve the hardness performance of steel materials. Generally, it is carried out after the mold is roughed. After the heat treatment is returned, the finishing process is carried out. However, there are risks in the process of processing. Improper handling will cause cracks in the steel material. Scrap, then what are the reasons for the abnormality of the plastic pallet mould steel?

1) There is serious segregation of network carbide in the mold material.

2) There is machining or cold plastic stress in the mold.

3) Improper heat treatment operation of molds (too fast heating or cooling, improper selection of quenching cooling medium, too low cooling temperature, too long cooling time, etc.).

4) The complex shape of the mold, uneven thickness, sharp corners and thin threaded holes, etc., make the thermal stress and tissue stress residual too large.

5) The heating temperature of the plastic mold quenching process is too high to cause overheating or overburning.

6) After the mold is quenched, the tempering is not timely or the tempering holding time is insufficient.

7) When the mold is repaired and quenched, it is reheated and quenched without intermediate annealing.

8) If the mold is heat treated, the grinding process is improper.

9) During the EDM process after heat treatment of the mold, there are high tensile stress and microcracks in the hardened layer.