Common material and heat treatment of stamping die
The selection of stamping die material should consider the batch production of the workpiece. If the batch is not large, it is not necessary to choose the mold material with high life. The material of the workpiece should be considered, and the suitable material for different materials is different. For the blanking die, the wear resistance is an important factor in determining the life of the die. The wear resistance of the steel depends on the state of carbide and the hardness of the matrix. The higher the hardness of the two, the more the number of carbides, the better the wear resistance. The inferior advantages of the wear resistance of the commonly used stamping die steels are carbon tool steel alloy tool steel - matrix steel - Gao Tangao chromium steel - high speed steel - steel bonded hard alloy - hard alloy. In addition, the influence of the thickness, shape, size and accuracy of the workpiece on the material selection of mould must be considered.
Commonly used stamping die heat treatment materials and die heat treatment process, we hope to help.
1, T10A heat treatment
T10A is carbon tool steel with certain strength and toughness. But the wear resistance is not high, quenching is easy to deformation and cracking, poor hardenability, only suitable for simple workpiece shape, small size, a small number of punching die. The heat treatment process of T10A carbon tool steel is: 760~810 C water or oil quenching, tempering at 160~180 C, hardness 59~62HRC.
2, CrWMn, 9Mn2V heat treatment
CrWMn and 9Mn2V are high carbon and low alloy steels. Quenching is easy to operate and hardenability is better than carbon tool steel. Deformation is easy to control. But the wear resistance and toughness are still low, and it is applied to medium batch and complicated die blanking dies. The heat treatment process of CrWMn steel is as follows: quenching temperature is 820~840, oil is cold, tempering temperature is 200 c, hardness is 60~62HRC. The heat treatment process of 9Mn2V steel is: quenching temperature 780~820 degree C oil cooling, tempering temperature 150~200 C, air cooling, hardness 60~62HRC. Note that tempering temperature has temper brittleness and significant volume expansion in the range of 200~300 C, and should be avoided.
3, Cr12 and Cr12MoV heat treatment
Cr12 and Cr12MoV are high carbon and high chromium steel with high wear resistance, small deformation and good hardenability during quenching, which can be used in large mass production moulds, such as silicon steel sheet blanking die. However, there exist carbide inhomogeneity in these steels, which are prone to carbide segregation. Among them, Cr12 has higher carbon content, and the distribution of carbides is more serious than Cr12MoV, and brittleness is larger. The selection of heat treatment technology for Cr12 steel depends on the requirements of the use of the mold. When the mold requires a relatively small deformation and a certain toughness, it can be quenched by low temperature, tempering (Cr12 for 950~980 C, 150~200 C tempering, Cr12MoV for 1020~1050 C quenching, and 180~200 C tempering). In order to improve the use temperature of the mold and improve its hardenability and red hardness, high temperature quenching, tempering (Cr12 1000~1100 C quenching, 480~500 C tempering, Cr12MoV for 1110~1140 C quenching, 500~520 C tempering) can be used. 
