How does Manhart (Guangdong) CNC Machine Tool Co., Ltd. reduce heat treatment deformation of molds through preheating and tempering treatment?

Reducing the heat treatment deformation of the mold through preheating and tempering is an important step in the heat treatment process. Here are some specific methods:
1. * * Preheating treatment * *:
Preheating is an important step before mold heat treatment, which can effectively reduce the thermal stress of the mold during the heating process, thereby preventing deformation during heat treatment.
** * Control preheating temperature * *: The preheating temperature should be set according to the material, size, and required heat treatment process of the mold. Usually, the preheating temperature should be lower than the final heating temperature, but it should not be too low to avoid affecting the effectiveness of heat treatment.
** * Uniform preheating * *: Ensure that all parts of the mold are evenly heated to avoid local overheating or undercooling. This can be achieved by arranging heating equipment reasonably and adjusting heating time and speed appropriately.
** * Remove moisture and grease * *: Before preheating, ensure that the surface of the mold is clean and remove moisture and grease to prevent the formation of bubbles or oxidation during the heating process.
2. * * Tempering treatment * *:
Tempering is an important step after heat treatment, which can eliminate the internal stress generated during the quenching process, stabilize the microstructure of the mold, and thereby reduce heat treatment deformation.
** * Choose the appropriate tempering temperature * *: The tempering temperature should be set according to the material, hardness requirements, and expected performance of the mold. Excessive tempering temperature may lead to a decrease in mold hardness, while excessively low tempering temperature may not completely eliminate internal stress.
** * Control tempering time * *: The tempering time should be long enough to ensure that the internal structure of the mold is fully stable. Meanwhile, the tempering time should not be too long to avoid excessive softening of the mold.
*Multiple tempering: In some cases, multiple tempering treatments can be performed to further eliminate internal stress and reduce heat treatment deformation.
Overall, reasonable preheating and tempering can effectively reduce the heat treatment deformation of the mold. In the actual operation process, the preheating and tempering parameters should be flexibly adjusted according to the specific situation of the mold and heat treatment requirements to achieve the best heat treatment effect.