Drawing characteristics of cylindrical deep drawing parts

Stretching parts are widely used, and you can often see them in your life. Manufacturers of drawing parts need to understand the drawing characteristics of drawing parts during the stamping process in order to better control production. Cylindrical drawing parts are a common type of metal stamping drawing parts. Next, Precision will introduce the drawing characteristics of the lower cylindrical drawing parts. 1. The stretch coefficient and stretch time of the cylindrical stretched part. The stretch coefficient m refers to the ratio of the diameter of the cylindrical portion (or the diameter of the semi-finished product) to the diameter of the blank (or the semi-finished product) before and after stretching. 2. Partial drawing Stamping parts can only be stamped and formed at one time, and the stamping coefficient is the ratio of the diameter d of the cylindrical part of the stamping part to the diameter D of the blank. 3. Some stretched parts need to be stamped multiple times before forming. The stretch factor can be used to indicate the degree of deformation of the material during stretching. The smaller the value of the stretch coefficient m, the greater the degree of deformation. 4. From the perspective of reducing production costs and improving economic efficiency, the better the number of stretching, it is hoped that the stretching coefficient of each stretching can be reduced as much as possible. However, the smaller the value of m, the greater the degree of deformation, and the greater the value of pmax. When m is reduced to a certain value, the pmax value will reach the tensile strength σb of the dangerous area, which will cause the dangerous area to rupture. In deep drawing, the tensile coefficient corresponding to the condition that the dangerous area is at the edge of the tensile crack is called the ultimate tensile coefficient (or the lower limit of the tensile coefficient) and is recorded as mmin. The value of the ultimate tensile coefficient depends on the upper limit of the tensile stress in the force transmission area of u200bu200bthe cylinder wall and the strength of the dangerous part. Any factor that can reduce the upper limit of the tensile stress in the force transmission area of u200bu200bthe cylinder wall or increase the strength of the dangerous part will help reduce the ultimate pullout coefficient. 5. The higher the strengthening rate of the material (the smaller the ratio of σs/σb, the larger the value of n and D), the smaller the value of the ultimate tensile coefficient. The larger the thickness anisotropy index, the smaller the ultimate stretch coefficient. [Related Recommendations] Learn more: Analysis of the causes of wrinkles on the surface of drawing parts Learn more: What factors affect the quality of automotive stamping parts Learn more: How to design stamping parts