Deviation value of metal stamping parts

The deviation of metal stamping parts relative to the size of the convex and concave molds is mainly due to the extrusion deformation and fiber deformation of the material when the parts are pushed out of the concave mold (blanking parts) or unloaded from the punch (punching parts). It is caused by elastic recovery due to elongation, dome, etc. The deviation value may be positive or negative. The factors that affect this deviation are: the gap between the convex and concave molds, the material properties, and the shape and size of the workpiece. The main factor is the gap value of the convex and concave molds.サWhen the gap between the die and the die is large, the stretching of the material will increase. After the punching is completed, the size of the blanking part shrinks to the solid direction due to the elastic recovery of the material. The size of the blanking part is smaller than the die size, and the punching hole Larger than the diameter of the punch. In the cold stamping process, stamping die is a special process equipment for processing materials (metal or non-metal) into parts (or semi-finished products), which is called cold stamping die (commonly known as cold stamping die). Stamping is a pressure processing method that uses a mold installed on a press to apply pressure to the material at room temperature to cause separation or plastic deformation to obtain the required parts. Stamping die is an indispensable process equipment for stamping production, and it is a technology-intensive product. The quality, production efficiency and production cost of stamping parts are directly related to mold design and manufacturing. The level of mold design and manufacturing technology is one of the important indicators to measure the level of product manufacturing in a country, and to a large extent determines the product quality, efficiency and new product development capabilities. The dimensional accuracy of the stamping part refers to the difference between the actual size of the blanking part and the basic size. The smaller the difference, the higher the accuracy. This difference includes two deviations. One is the difference between the stamping part and the punch or die. The deviation of the size, the second is the manufacturing deviation of the blanking die itself. Previous post: Mold affects the forming and accuracy of stamping parts