Discussion on the Causes and Preventive Measures of Heat Treatment Deformation of Products in Precision Mould Factory
Research on the deformation conditions and causes of precision and complex molds to explore measures to reduce and control the deformation of precision and complex molds to improve the quality and service life of mold products.
1. The influence of mold material
1. Mold selection
Considering the simplicity of material selection and heat treatment, a mold company chooses T10A steel to make more complex molds with large differences in cross-sectional dimensions and small deformation after quenching. The hardness requires 56-60HRC. After the heat treatment, the hardness of the mold meets the technical requirements, but the mold is deformed and cannot be used, resulting in the mold being scrapped. Later, the company used micro-deformed steel Cr12 steel, and the hardness and deformation of the mold after heat treatment met the requirements. Preventive measures: When manufacturing sophisticated and complex molds that require less deformation, use micro-deformed steel, such as air-quenched steel, as much as possible.
2. The influence of mold material
A certain factory sent a batch of Cr12MoV steel to manufacture more complex molds. The molds all had Φ60mm round holes. After the heat treatment of the mold, some of the mold holes appeared oval, which caused the mold to be scrapped. Generally speaking, Cr12MoV steel is slightly deformed steel and should not be deformed significantly. We conducted a metallographic analysis of the severely deformed mold and found that the mold steel contains a large amount of eutectic carbides, which are distributed in bands and blocks.
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