Soft die refers to the use of low melting point alloy such as zinc base alloy or steel or aluminum plate manufacturing mold, characterized by short mold manufacturing cycle, low cost, short life, generally can only make dozens to thousands of different parts will be scrapped, but after the mold scrap materials can be recycled, soft die parts are generally used for product parts functional verification and rapid production of samples for loading test, Soft die process and mass production process are very different, generally only manufacturing forming mold, such as drawing and shaping, middle cutting and punching processes are usually implemented by hand or laser cutting, and forming mold need to do as much as possible once forming to the product shape, and even many flanging in mass production mold process will also be made in the forming mold. In order to achieve this situation, the drawing process is allowed to use step by step multiple strokes and then to the bottom dead point to shape the parts out.