免费观看AV_日韩av在线免费观看_国产AV秘无码一区区三区_亚洲无码人妻_AV无码精品一区二区三区_免费一级一级黄色人妻片_91精品国产午夜福利在线观看_日韩久久千不卡_色婷婷91_亚洲欧美日韩一级_久久国产精品第一页_国产亚洲精品女人久久久久久_七月丁香月婷婷_久久综合久久鬼_亚洲无码在线播放

The shell deep drawing stamping part is a cylindrical bottle shaped part that deepens the sheet metal; In deep drawing operations, the diameter of the blank is influenced by the circumference of the shell, which in turn is influenced by the flowability of the stamping material and the inward flow resistance and edge resistance of the peripheral material; When the resistance of the edge material exceeds the limit, the edge will wrinkle and become unstable. To avoid wrinkling, it is necessary for the stamped part material to flow smoothly between the punch and the blank holder. The two main reasons for deep drawing fracture are that the ratio of the diameter of the deep drawing stamping part to the diameter of the blank exceeds the limit value, and when the drawing radius is drawn from a flat blank to a shell and the shell is drawn to a smaller diameter shell, there is a limit value for the inward flow distance of the material, commonly referred to as the drawing coefficient. The ultimate drawing coefficient is influenced by factors such as the material fluidity of the stamping part, the material compression capacity, and the flow resistance caused by compression. Excessive flow resistance causes damage and wrinkling at the edge of the shell, which is the area with the weakest material resistance;