On the premise of ensuring the hardness of the mould, the pre cooling, staged cooling and quenching or temperature quenching process shall be adopted as far as possible.

2. Changping heat treatment suggestions. For the precision and complex die, the nitriding heat treatment plant suggests that the vacuum heating quenching and the deep cooling treatment after quenching should be adopted as far as possible when the conditions permit.

3. For some precision and complex dies, pre heat treatment, aging heat treatment and quenching, tempering and nitriding heat treatment can be used to control the precision of the dies.

4. When repairing mold defects such as sand hole, air hole, wear, etc., nitriding heat treatment plant selects repair equipment with small thermal impact such as cold welding machine to avoid deformation during repair.

5. The die structure design should be reasonable, the thickness should not be too different, and the shape should be symmetrical. Experts say that for large-scale and complex dies, the deformation law should be mastered and machining allowance should be reserved. For large-scale and precise complex dies, the combined structure can be used.

6. The precision and complex mould should be pre soft nitriding to eliminate the residual stress in the machining process.