冲压模具材料的选用及热处理要求（Selection of stamping die material and heat treatment requirement）Stamping die material selection and heat treatment requirements.Txt life is out of, not want to come out. Put down is once, can not put down is memory. Wherever I am, I only have a turning distance from you. Selection of blanking die material and heat treatment requirementThe blanking die material should consider batch workpiece production, if the volume is not high there is no need to select the life of die material; should also consider washed workpiece materials, different materials for the mould materials are also different. For punching die, wear resistance is an important factor in determining the die life, depends on the wear resistance steel carbide in hard phase condition and matrix hardness, both higher hardness, the more the number of carbide is better wear resistance. The inferior and common stamping die steel wear resistance are carbon tool steel alloy tool steel - steel - steel - Gao Tangao matrix of high speed steel - steel bonded carbide - hard alloy.In addition, the influence of the thickness, shape, size and precision requirements of the workpiece on the material selection of the mold must be considered.1. traditional die steel, for a long time, the domestic sheet blanking die steel for T10A, CrWMn, 9Mn2V, Cr12 and Cr12MoV and so on.Among them, T10A is carbon tool steel, with certain strength and toughness. But the abrasion resistance is not high, the quenching is easy to deformation and crack, and the hardenability is poor. It is only suitable for the blanking die with simple shape, small size and small quantity.T10A carbon tool steel heat treatment process is: 760810 degrees of water or oil quenching, 160180 degrees tempering, hardness 5962HRC.CrWMn and 9Mn2V are high carbon and low alloy steel. Quenching is easy to operate and hardenability is better than carbon tool steel. Deformation is easy to control. But the abrasion resistance and toughness are still low. It is applied to the punching die with medium volume and complicated workpiece shape. CrWMn steel heat treatment process is: quenching temperature 820840 degrees, oil cold, tempering temperature 200 degrees, hardness 6062HRC. The heat treatment process of 9Mn2V steel is: quenching temperature 780820 DEG C, oil cold, tempering temperature 150200 DEG C, air cooling, hardness 6062HRC. Attention should be paid to tempering temperature in the range of 200300 DEG C, temper brittleness and significant volume expansion should be avoided.Cr12 and Cr12MoV for high carbon high chromium steel, high wear resistance, quenching deformation is small, good hardenability, mold used for mass production, such as silicon steel punching die. But this kind of steel has carbide inhomogeneity, which is easy to produce carbide segregation, and it is easy to break or break during cutting. Among them, Cr12 has higher carbon content and uneven carbide distribution, which is more brittle than Cr12MoV.Require the use of the heat treatment process of Cr12 steel depends on the choice of the mold, when the mold requirements relatively small deformation and toughness, the low temperature quenching and tempering (Cr12 950980 DEG C for quenching, tempering; 150200 C Cr12MoV 10201050 C 180200 C quenching, tempering). If you want to improve the temperature of the mold, improve its hardenability and hardness, can be made of high temperature quenching and tempering (Cr12 10001100 DEG C for quenching, tempering; 480500 C Cr12MoV 11101140 C 500520 C quenching, tempering).High chromium steel is temper brittleness in the 275375 C region should be avoided.2. commonly used mold, new steelIn order to make up for the defects of the traditional mould steel, the steel used for stamping die is developed or imported at home:(1) Cr12Mo1V1 (code name D2) steel is a kind of steel imported from D2 steel in the United States ASTM standard, which belongs to Cr12 type steel. Due to the increased Mo and V content in D2 steel, refine the grain, improve the distribution of carbide, so the strength and toughness of D2 steel (impact toughness, bending strength, deflection) increased more than Cr12MoV steel, wear resistance and anti tempering stability is also higher than Cr12MoV. Cryogenic treatment can be used to improve hardness and dimensional stability. The life of punching die made of D2 steel is higher than that of Cr12MoV steel mould.D2 steel has slightly worse forging and thermoplastic properties than Cr12MoV steel, and its mechanical properties and heat treatment process are similar to those of Cr12 steel.(2) Cr6WV steel of high wear-resistant steel micro deformation of high carbon, carbon and chromium content was lower than that of Cr12 steel, the carbide distribution is uniform Cr12MoV, has good hardenability. The heat treatment has little deformation and better machinability. The flexural strength and impact toughness are bett