Empirical and numerical investigation on the formability of clad sheets copper / stainless steel 304l in spinning process

In the present study the spinning process of clad sheets composed of Copper-Stainless steel 304L investigated experimentally. To produce the Copper-Steel 304L clad sheet the explosive welding method has been used. In order to smooth the surface of clad sheets، a cold roll forming process was done on the sheets. For investigation of diffusion process in interface where copper and stainless steel connected together، to produce a suitable metallurgical bounding and increase formability، the bonded sheets heat treated in duration of 32 hours in 300° C temperature. The mechanical properties of copper-steel clad sheet were extracted by experimental measurements. Then، these welded specimens were put under the EDS and SEM tests to investigate the probability of material diffusion in interface welded. The copper-steel 304L clad sheet with an internal layer of copper and an external layer of steel، used in the spinning process. The effects of influential parameters on the mentioned process including formability، tool path and tool materials on formability of the clad sheets have been investigated. Sub structural investigations on the common surface of metal connection revealed that the cross section of this area is wave-like shape and also heat treatment process increases the formability of clad sheets and causes diffusion of materials remarkably. Final results show that SPK2436 is suitable tool material، the involute curve is the best tool path and the spinning ratio lower than 2. 5 is possible to form the clad sheets.