Abstract:

The oxidation of blanking sections of IT products may weaken the contact conductibility and eventually lead to the function failure of products. In order to solve these problems, a plane-strain rigid-plastic finite element analysis （FEA） model is established to numerically simulate the deformation and flow of coating metal in the blanking process. Moreover, a method to estimate the distribution of coating metal in the blanking section is presented and is then verified by experiments using the tin-phosphorus-bronze band with Sn coating. The results show that the coating metal mainly disperses in the roll-over and the euphoric zones of blanking section during the blanking, and that the numerically-simulated content of coating metal in the euphotic zone of blanking section accords well with the experimental result. The proposed method can be applied to the die design for the purpose of estimating the content of coating metal on the blanking section at different blanking parameters, optimizing the parameters to increase the metal content and to further improve the antioxidant ability of the blanking section.

Key words: coating, blanking, flow law, coating distribution, finite element analysis