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Plastic mold heat treatment problems
Release time:2024-12-17
Mold heat treatment is an important means of enhancing the hardness properties of the steel material, usually after the mold roughing.
1)Severe reticulated carbide segregation exists in the mold material.
2) The presence of machining or cold molding stresses in the mold.
3) Mold heat treatment operation improperly lead to (heating or cooling too fast, quenching and cooling medium selection, cooling temperature is too low, cooling time is too long, etc.).
4)Complex shape of the mold, uneven thickness, with sharp corners and thin threaded holes, etc., so that the thermal stress and tissue stress residue is too large.
5) Plastic mold quenching process heating temperature is too high to produce overheating or overcooking.
6) Mold quenching tempering is not timely or tempering insulation time is insufficient.
7) mold repair quenching and heating, without intermediate annealing and re-heating quenching.
8) mold heat treatment, improper grinding process.
9) mold heat treatment after electric discharge machining, there are high tensile stress and micro cracks in the hardened layer.
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