Abstract
An electric connector is produced by press working with a progressive die. The surface of the workpiece is roughened by the compression process, and this roughness is harmful to the subsequent gold plating. Before clarifying this roughening mechanism, the deformation properties of a copper alloy with 0.645mm thickness in high-speed compression and the change in the macroscopic surface morphology, which affected the microscopic surface roughening, were examined in this study by a drop tester. The impact velocity and the impact energy were varied. The viscosity of the lubricant was also changed. The reduction ratio of the thickness of the workpiece was affected by the viscosity of the lubricant. The surface morphology was classified into five types depending on impact velocity and viscosity. Surface upheaval was observed when the lubricant flew out between the surfaces. Surface depression was caused by the squeeze effect of the lubricant.
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