1, material selection
Different materials have different tensile properties. The limit of drawing speed is the ratio of blank diameter to stamping diameter. Stainless steel material is controlled at 2. 1 ~ 2.2, and carbon steel is controlled at 2. 15 ~ 2.5. After deep drawing, stainless steel can be stretched for the second time, but unlike carbon steel, stainless steel cannot be stretched to the extent of the first time unless it is heat treated. The strength of stainless steel equipment is required to be 1 to 2 times that of carbon steel equipment. Generally speaking, double-acting hydraulic equipment is most suitable for deep drawing.
2, the choice of lubricating oil
There are two factors to consider when choosing lubricating oil, to provide oil film to prevent scratches and reduce friction. Moreover, after the deep drawing operation is completed, it should be convenient and thorough to remove. It can include chlorinated or vulcanized grease or wax, heavy emulsion, or deep-drawn soap solution.