目前,由于冷挤压 温热挤压、精密锻造和电热镦粗等少无切削新工艺的广泛应用,对于毛坯下料提出了越来越高的要求。既要求提高劳动生产率,又要求提高坯料的端面质量。 为了克服普通剪切坯料的一些缺陷,国内外已经研制了多种精密剪切模,这些模具安装在普通的压力机上,就可以进行棒料的 At present, due to the cold extrusion hot extrusion, precision forging and electric upsetting and other less cutting new technology is widely used, the blanks put forward higher and higher requirements. Both require increased labor productivity, but also to improve the quality of the blank end face. In order to overcome some of the shortcomings of ordinary shear blanks, a variety of precision shear dies have been developed both at home and abroad. These dies are mounted on a common press and can be used for bar stock