Abstract
Edge passivation of the punch is a common phenomenon that is induced by wear and which would affect tool life and part quality. To investigate the edge passivation of fine-blanking punch, a wear tester based on sheet metal extrusion was designed. The relevance of the designed tester in terms of the stress state to the fine-blanking process was analyzed via finite element methods. Meanwhile, material flow at the punch edge was studied with pad printing technology, and the effects of the punch geometry and extrusion stroke on the worn profile have been discussed. The results shows that reducing the length of straight lines and radius of arcs results in a large relative sliding distance of material at the punch edge, and for a punch with circular and linear edges, wear on the circular segment is more severe than that on the linear segment. In addition, from the viewpoint of simulation, adaption of the wear coefficient in different periods could lead to a more precise worn profile of the punch.
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