In the stamping process, the problem of cracks in bent parts has always been one of the problems. This paper will analyze the causes of cracks in bent parts in stamping from the aspects of material characteristics, process parameters and mold design, and propose corresponding solutions.
1.The first step is to understand the material properties of the bent part.
Different metal materials have different mechanical properties, such as elastic modulus, yield strength, breaking strength, etc. These properties determine the material's ability to deform and resist failure when subjected to stress. Therefore, when choosing the material of the bent part, its mechanical properties should be fully considered and the use of high-strength steel should be avoided.
2.The selection of process parameters has a great influence on the cracks of bent parts.
In the stamping process, the bending force, bending radius, bending speed, etc. are all process parameters that affect the generation of cracks. Therefore, in the stamping process, appropriate process parameters should be selected according to the mechanical properties and actual needs of the material to reduce the risk of cracks.
3.The design of the mold also has a great influence on the crack generation of the bent part.
A die is a tool that comes into direct contact with a material during the stamping process, and its shape, size, and surface quality will affect the quality of the bent part. When the mold design is not reasonable, it may cause stress concentration in the material during bending, resulting in cracks.
In view of the causes of cracks in stamping bent parts analyzed above, several solutions can be adopted:
1.Choose the right materials. According to the use environment and requirements of bent parts, select appropriate metal materials and avoid the use of high-strength steel. At the same time, heat treatment, cold treatment and other methods can be used to improve the mechanical properties of the material and improve its crack resistance in the stamping process.
2.Optimize process parameters. In the stamping process, appropriate process parameters should be selected according to the mechanical properties and actual needs of the material, such as bending force, bending radius, bending speed, etc.
3.Improve mold design. In the design of the mold, the characteristics of the material and the process requirements should be fully considered, and the shape and size of the mold should be reasonably set. Structures such as fillets and stiffeners can be used to disperse stress and avoid cracks caused by stress concentration. At the same time, it is necessary to ensure the surface quality and lubrication conditions of the mold, and reduce the influence of frictional resistance on cracks.