Forming Mechanism of Cold-Press Connection Between Heterogeneous Sheets

The traditional connections between dissimilar sheets metals have some drawbacks, such as the connection difficulties, high process requirement, and high cost. As a result of these drawbacks, this article proposes a new method for the connection of dissimilar sheet metals: the cold-pressing connection method. Based on the analyses of the structure and characteristics of the connections, three schemes were designed. Experimental results indicate that the elongation of the connection increases along the length direction during the connection process. Meanwhile, the thinning degree is smallest at the middle position of the connection and increases toward the two sides. As the punch load is increased, the close degree between connected sheets increases. The connection strength test between stainless steel sheet and aluminum alloy sheet with the loading force of 290 KN shows that tensile strength of Scheme 1 is 1.4 times higher than that in Scheme 3. The tensile strength of the connection between stainless steel sheet and aluminum sheet is larger than that of the connection between stainless steel sheet and aluminum alloy sheet at the same experimental condition. This article provides the theoretical basis for the popularization of this method.