Experimental study on wrinkle suppressing in multi-pass drawing spinning of 304 stainless steel cylinder

Abstract

Cylinder shell parts are widely used in industrial and civil areas, and 304 stainless steel cylinders were attempted to be formed by multi-pass drawing spinning. But wrinkling failure occurs in the spinning process. In order to suppress it, two comparative experiments with 206 mm and 245 mm mandrel diameters are carried out to reveal the wrinkling mechanism of multi-pass drawing spinning of 304 stainless steel cylinders. It is found that a thicker mandrel diameter is conducive to the wrinkle suppressing due to the larger instantaneous contacting zone caused by the bigger mandrel. The restraining mechanism of the wrinkling failure is due to the fact that a larger contacting zone can accommodate more circumferentially squeezed metal resulting in smaller tangential compressive stress. This is further proved by the spinning experiment with roller path amendment. The roller path is amended by increasing the curvature of the roller path arc and removing the backward arcs to reduce the tangential compressive stress. Almost no wrinkling failure occurs in the new 304 stainless steel cylinder spinning process.