Stainless steel products for its exquisite appearance, excellent corrosion resistance, high temperature oxidation resistance and high temperature strength and drew people of all ages, more and more widely used for decoration, light industry, civilian hardware, kitchen equipment and utensils, etc. . The appearance of these products due to the higher quality requirements, the whole process of the product, to ensure that the product is not high surface brightness scratches and abrasions very difficult indeed, particularly since the drawing properties of stainless steel sheet brought Die Selection , heat treatment, machining and process lubrication problems directly affecting product quality gold, yield, cost and die life.

1 stainless steel sheet bonded tumor characteristics and Drawing

Due to the high yield point of stainless steel, high hardness, work hardening effect is remarkable, stainless steel sheets were drawing the following features:

1) due to poor thermal conductivity than ordinary low-carbon steel, resulting in deformation force required;
2) stainless steel sheet drawing, the severe plastic deformation hardening, easy to wrinkle when drawing sheet, filled to a large BHF;
3) sheet in the rebound to pull furrow mold fillet bending and reverse bending caused, usually in the product side wall forming the recess deforms so high dimensional accuracy and shape requirements of the product need to increase the shaping process to achieve.
4) stainless steel sheet bonded tumor phenomenon drawing process prone.

From the microscopic point of view, crude key panel material and the mold surfaces are uneven, due to the drawing process BHF large load by the local unit to withstand a lot of pressure protrusions; because of generated between the sheet and the mold relative movement and the plastic deformation of sheet metal production of heat, so that the lubricating film viscosity decreases, lower intensity; protrusions on the sheet at high pressure, instantaneous temperature, by motion under shear, lubricating membrane rupture, sheet metal and mold in direct contact, sheet metal protrusions being scraped mold protrusions become debris pile in front of people die protrusions, such as temperature high enough so that the pieces soften, melt, dry welding in the mold to form an adhesive tumors. Bond and form a tumor is difficult to come off, and the greater the more viscous, leading to deep drawing steel sheet products left on the surface serious scratch. In addition, the drawing speed, sheet metal deformation children size also plays an important role on the bond neoplasia. How to avoid drawing die to form an adhesive tumors, improve the surface quality of drawing parts are stainless steel sheet drawing technical problems lies.