How to prevent deformation of metal stamping dies?

Some metal stamping dies are very good in material selection and steel materials, often because of unreasonable die structure design, such as thin edges, sharp corners, grooves, abrupt steps, and thickness disparity, which cause large deformation of the metal stamping die after heat treatment. 1. The reason for the deformation is due to the uneven thickness of the mold or the presence of sharp rounded corners, so the thermal stress and the structural stress between the various parts of the mold are different during quenching, which leads to the difference in volume expansion of each part, which causes the mold to deform after quenching. . 2. Preventive measures When designing metal stamping dies, in the case of meeting actual production needs, the thickness disparity and structural asymmetry of the die should be reduced as much as possible. At the junction of the thickness of the die, structural design such as smooth transition should be adopted as much as possible. The machining allowance is reserved according to the deformation law of the mold, so that the mold will not be scrapped due to the deformation of the mold after quenching. For molds with particularly complex shapes, a combined structure can be used to ensure uniform cooling during quenching. It is often found in the factory that some molds with complex shapes and high precision requirements deform greatly after heat treatment. After careful investigation, it is found that the metal mold molds have not undergone any pre-heat treatment during the machining and final heat treatment stages. Causes of deformation The superposition of the residual stress during machining and the stress after quenching increases the deformation of the die after heat treatment. 2. Preventive measures (1) After rough machining and before semi-finishing machining, a stress relief annealing should be carried out, that is (630-680)℃×(3-4)h furnace cooling to below 500℃, out of furnace air cooling, or 400℃×( 2-3) h stress relief treatment. (2) Lower the quenching temperature and reduce the residual stress after quenching. (3) Air cooling with quenching oil at 170oC (stage quenching). (4) The use of austempering process can reduce the quenching residual stress. Using the above measures can reduce the residual stress of the mold after quenching, and the deformation of the mold is smaller. The 7 patented technologies have been continuously improved and have been unanimously recognized by manufacturers in the industry. If you need to know more, please consult: Company website: