随着冷挤压、冷模锻、温热挤压、气门电镦、连杆辊锻、精密锻造和精密辗压等新工艺的发展及应用,精密剪切毛坯的工序则显得更加迫切需要。如冷挤压对毛坯的几何精度、剪切面质量和重量公差有着严格的要求,因此,毛坯的制备是冷挤压工艺的一个关键的组成部分,对实际生产有着重要的意义。目前,下料的方法较多,如车床下料、锯切割、棒料剪断等等。但这些方法都存在着这样或那样的缺点,很难满足对毛坯尺寸、形状的高精度要求。因此,为了提供形状正确、断面平整和重 With the development and application of new technologies such as cold extrusion, cold forging, hot extrusion, valve electrical upsetting, connecting rod forging, precision forging and precision rolling, the process of precision cutting of blank is even more urgent. For example, the cold extrusion has strict requirements on the geometric precision, the quality and the weight tolerance of the blank, so the preparation of the blank is a key part of the cold extrusion process, which is of great significance to actual production. At present, there are many ways of cutting, such as lathe cutting, saw cutting, bar cutting and so on. However, these methods have some shortcomings of one kind or another, so it is difficult to meet the high-precision requirements on the size and shape of the blank. Therefore, in order to provide the correct shape, section flat and heavy