A Comprehensive Study of Hole Punching Force for AHSS

Paper #:
  • 2018-01-0802

Published:
  • 2018-04-03
Abstract:
The elevated strength of advanced high strength steels (AHSS) leads to great challenges for the sheet metal processing, one of which is hole punching operation. The total tonnage must be estimated in each trimming stage to ensure successful cutting and protect the press machine. This paper presents the effects of hole punch configurations on the punching force with the consideration of punch shape, cutting clearance and material grade. The hole punching experiments were performed with DP590, DP980, DP1180 and a mild steel as a reference. The punching force coefficient is calculated based on the experimental measured data, and it indicates a negative correlation with the material strength. Cutting consumed energy and surface quality were examined to analyze the damage accumulation during the punching process. The cutting mechanisms with various punch shapes were revealed through an extensive finite element simulation study. Keyword: Hole punch, punching force coefficient, AHSS, finite element simulation
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