免费国产视频_亚洲国产女人精品久久久_国产欧美日产A片_91porn国产_欧美精品久久久久久久久久丰满_日日日夜夜操_91熟妇视频_精品探花对白视频在线观看,97久人人做人人妻人人玩精品 ,91露脸熟女对白不带套,正在播放日韩一区二区

What about the rebound generated during the bending process of precision shrapnel? There are two main methods for controlling the rebound of stamping parts in Ligao precision molds, and I will provide you with reference.

There are two methods for controlling the rebound of precision shrapnel. One is the over compensation method, and the other is the process control method. According to the trend of rebound, manufacturing a compensation angle in the mold that is consistent with the expected rebound, or controlling excessive stamping of the punch, is called a compensation method. This is a widely used method for controlling the rebound of precision shrapnel. However, when there are complex shaped curved products and high precision requirements, the accuracy control of rebound is limited because it is difficult to accurately estimate the rebound amount.

The second method of changing the stress state of the sheet, the process control method, is used to control rebound. Usually, this process includes stamping, tension bending, and hot bending. During the stamping process, the additional stress in the thickness direction of the plate changes the stress distribution in the bending deformation area. By applying a tangential tensile deformation and reducing the bending moment at the bending point of the precision spring, the rebound of the sheet metal is controlled.