Study on progressive micropunching process of T2 copper complex shaped parts
To investigate the progressive micropunching process for mesoscale T2 copper complex shaped parts with thickness of 0.2 mm,the microstructure and mechanical properties of T2 copper thin strip were obtained by metallographic corrosion and tensile tests.The com-plex shaped parts were prepared by the conventional micropunching and progressive micropunching processes,respectively,and the over-all morphologies and cross section morphologies of the formed parts were observed and analyzed by 3D laser scanning microscopy and scan-ning electron microscopy.The results show that the dimensional accuracy and shape accuracy of the formed parts obtained by progressive micropunching process are higher than that obtained by conventional micropunching process,and the process can significantly reduce the area of the fillet belt in the cross section of the punched parts in the conventional micropunching process,improve the shearing zone mor-phology and the surface finish of smooth zone,and obtain better quality of the punching cross section.
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