在某些机器制造厂的冲压车间里,生产过程中经常遇到的问题就是零件的拉延工艺,特别是技术要求较高。形状复杂的拉延件,很容易出现裂缝及在表面上产生线纹。这种现象,以前我们只归于模具设计及工艺上存在问题。其实,钢板的时效硬化亦是造成上述缺陷的重要原因之一。但是,这个原因常常被人们忽略。有的工厂就因为缺乏这方面的研究,将钢板长期存放,等以后使 In some machine shop stamping shop, the production process is often encountered in the drawing process of parts, especially the higher technical requirements. The complex shape of the drawing pieces, it is easy to crack and the surface lines. This phenomenon, in the past we only attribute to die design and process problems. In fact, the aging of steel plate is also one of the important reasons for the above defects. However, this reason is often overlooked. Some factories because of the lack of research in this area, the long-term storage of steel, so later