用塑性冷变形压制零件和毛坯时,会产生金属硬化,并使变形抗力增大和塑性降低,因为一道工序的变形率是有限的。如需经过较大的变形来压制成品,则必须采用几道工序,而在各道工序中间需增加热处理工序,以恢复材料的塑性。在现有的低碳钢(C=0.1％)杯形件压制工艺规程中,都规定挤压后要对毛坯进行热 With cold plastic deformation of parts and rough, it will produce metal hardening, and the deformation resistance increases and plasticity decreased, because a process of deformation rate is limited. If you want to press the finished product after a large deformation, you must use a few processes, and in the middle of each process need to increase the heat treatment process to restore the plasticity of the material. In the existing low-carbon steel (C = 0.1%) cup-shaped pressing process, the provisions of the extrusion after the blank to be hot