Nov 12,2024
Mold heat treatment is an important means to improve the hardness of steel materials, which is generally carried out after the mold is roughened.
1) There is serious network carbide segregation in the mold material.
2) There is mechanical processing or cold plastic stress in the mold.
3) Improper mold heat treatment operation (heating or cooling too fast, improper selection of quenching cooling medium, too low cooling temperature, too long cooling time, etc.).
4) The mold has a complex shape, uneven thickness, sharp corners and thin threaded holes, etc., which makes the thermal stress and tissue stress residual too large.
5) The heating temperature during the quenching process of the plastic mold is too high to cause overheating or overburning.
6) The mold is not tempered in time after quenching or the tempering insulation time is insufficient.
7) When the mold is repaired and quenched, it is heated and quenched again without intermediate annealing.
8) For molds that have been heat treated, the grinding process is improper.
9) When the mold is electrospark machined after heat treatment, high tensile stress and microcracks exist in the hardened layer.
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