Prevention of mold deformation during heat treatment
On the premise of ensuring the hardness of the mold, pre-cooling, step-cooling quenching or warm quenching techniques are used as much as possible.
1. Changping heat treatment is recommended. For precision and complex molds, under conditions permitting, the nitriding heat treatment plant recommends that vacuum heating quenching and cryogenic treatment after quenching be used as far as possible.
2. For some precise and complicated molds, pre-heat treatment, aging heat treatment, and quenching and nitridation heat treatment can be used to control the accuracy of the mold.
3. When the nitriding heat treatment plant repairs defects such as mold holes, blowholes, and wear, it uses cold welding machines and other repair equipment with low thermal impact to avoid deformation during the repair process.
4, the mold structure design should be reasonable, thickness should not be too disparate, the shape should be symmetrical, experts said that for large deformation mold to master the deformation law, reserve machining allowance, for large, precision and complex molds can use a combined structure.
5.Precise and complex nitriding is required to eliminate the residual stress generated during machining.