Hot Pressing Machine 1, punch press of the thermal processing Practice has confirmed that the quality of the hot mold processing and service life of the mold a great impact. Die from the failure analysis of the reasons we can see, due to improper heat treatment caused mold failure ‘accident’ about 40% or more. Punch die parts quenching deformation and cracking, the early use of the process of fracture, with the touch with the thermal processing technology. (1) press the quenching and tempering press. This is the mold heat treatment in the hub. If the quenching heat generated overheating, not only will cause greater brittleness of the workpiece, but also in the cooling caused by deformation and cracking, seriously affect the life of the mold beam fabrication. Die quenching heating should pay special attention to prevent oxidation and decarburization, should strictly control the heat treatment process specifications, the premise of the case, can be vacuum heat treatment. Quenching should be promptly tempered, and in accordance with technical requirements using different punch tempering process. (2) stress relief annealing. Punch press mold parts in the rough after the stress should be carried out annealing treatment, with the purpose of eliminating the roughing caused by internal stress, so as not to produce excessive quenching deformation and cracks milling machine for sale. For high precision molds, after grinding or electric processing needed by the elimination of stress tempering treatment is conducive to the accuracy of the mold is not chaotic, and improve service life. (3) punch casting process, which is part of the mold manufacturing process an important part. For high-alloy tool steel mold, the material is usually carbide distribution and other microstructure technical requirements.

In addition, should also strictly control the casting temperature range, to develop accurate heating specifications, the use of accurate casting force method, and slow cooling after forging or timely annealing. (4) Preparation of heat treatment. Should be depending on the mold work parts of the different materials and requirements were used annealing cnc shearing machine, normalizing or quenching and other preparation heat treatment process to improve the organization, to eliminate casting defects in the organization to improve the processing technology. High-carbon alloy die steel through the appropriate preparation of heat treatment can eliminate the reticulation of secondary cementite or chain carbide, the carbide ball, refinement, and promote the distribution of carbide uniformity. This is conducive to ensuring quenching, tempering quality, improve die life. 2, punch press surface quality Die parts with the surface quality of the pros and cons of mold wear resistance, fracture resistance and anti-adhesion ability has a very close relationship, a direct impact on the service life of the mold. Especially the value of surface roughness on the life of a great impact on the mold, if the surface roughness value is too large, the work will produce stress concentration phenomenon, and in its peak, the valley between the cracks easily affect the cost-resistant die, but also Will affect the workpiece surface corrosion resistance, a direct impact on the die life and accuracy.