Prevention and Correction of Failure Forms of Stamping Die and Die

One manifestation of die bursting of stamping parts is die effect. The main forms of die failure are wear failure, deformation failure, fracture failure and other defects. However, due to the different stamping and forming processes and different working conditions, all will affect the stamping and forming service life of the mold.　　1. Stamping equipment 　　 The precision and rigidity of stamping equipment (such as presses) have an extremely important impact on the life of the die. The higher the precision of the stamping equipment, the better the rigidity and toughness, which greatly improves the life of the die. For example: the complex silicon steel sheet die material is Crl2MoV. When used on an ordinary open press, the average regrinding life is 10,000 to 30,000 times, while when used on a new precision press, the die regrinding life can reach 60,000 to 120,000 times. Especially for small or no gap punches, hard alloy punches and precision punches, presses with high precision and good rigidity must be selected. Otherwise, the life of the mold will be reduced, and the mold will be damaged in severe cases.　　2, mold design 　　 (1) the precision of the guiding mechanism of the mold. Accurate and reliable guidance has a great impact on reducing the wear of mold working parts and avoiding damage to convex and concave molds, especially for gapless and small gap blanking dies, composite dies and multi-station progressive dies. In order to improve the life of the mold, it is necessary to correctly select the guiding form and determine the accuracy of the guiding mechanism according to the nature of the process and the accuracy of the parts. Under normal circumstances, the accuracy of the guide mechanism should be higher than the matching tip of the male and female molds.　　 (2) The geometric parameters of the cutting edge of the mold (convex and concave mold). The shape, matching clearance and fillet radius of the convex and concave molds not only have a great influence on the forming of stamping parts, but also have a great influence on the wear and life of the mold. For example, the fit clearance of the mold directly affects the quality of the blanking parts and the life of the mold. For higher precision requirements, a smaller gap value should be selected; otherwise, the gap can be appropriately increased to increase the life of the mold.　　3, stamping process　　 (1) the raw material of stamping parts. In actual production, due to the excessive thickness tolerance of the raw materials of the external pressure parts, fluctuations in material properties, poor surface quality (such as rust) or dirty (such as oil stains), etc., it will cause increased wear of mold working parts and easy chipping. as a result of. Therefore, attention should be paid to: ①Use materials with good stamping processability as much as possible to reduce stamping deformation force; ②Strictly check the grade, thickness and surface quality of the raw materials before stamping, and wipe the raw materials clean, and clean the surface if necessary Oxide and rust; ③According to the stamping process and the types of raw materials, softening treatment and surface treatment can be arranged when necessary, and suitable lubricants and lubricating processes can be selected.　　 (2) Layout and edging.　　 Unreasonable reciprocating feeding layout method and too small overlap value will often cause rapid wear of the mold or damage to the convex and concave molds. Therefore, while considering the improvement of material judgment and utilization, it is necessary to reasonably select the layout method and the edge value of the tube heat exchanger according to the processing batch, quality requirements and mold matching gap of the parts to improve the life of the mold.　　4. Mold material 　　The influence of mold material on mold life is a comprehensive reflection of material types, chemical composition, organizational structure, hardness, and metallurgical quality. The mold life of different material molds is often different. For this reason, two basic requirements are put forward for the materials of the working parts of the die: ①The use performance of the material should have high hardness and high strength, and have high wear resistance and sufficient toughness, small heat treatment deformation, and a certain degree of thermal hardness; ② The process performance is good. The manufacturing process of die working parts is generally more complicated. Therefore, it must have adaptability to various processing techniques, such as forgeability, machinability, hardenability, hardenability, quenching crack sensitivity and grinding workability. Usually according to the material characteristics of the stamping parts, production batch size, precision requirements, etc., the mold material with excellent performance is selected, while taking into account its manufacturability and economy. Related news: The characteristics of the main materials of stamping parts, the treatment of common problems of stamping parts, the characteristics of scaffolding stamping parts and the importance of inspections