Impact of Servo Press Motion on Hole Flanging of High Strength Steels

Paper #:
  • 2017-01-0311

Published:
  • 2017-03-28
Abstract:
The capabilities of the servo press for varying the ram speed during stroke and for adjusting the stroke length are well known. Also during the blanking operation, the servo can help to slow down the press at the critical moment of blanking without losing overall productivity. The overall objective of this study is to determine, for a selected sheet material and hole diameter, the servo press motion that possibly could provide the “Best” possible blanked/sheared edge quality to improve the Hole Expansion Ratio (HER) in hole flanging. The specific objectives are to determine the effect of ram (blanking) speed upon the edge quality, and the effect of multiple step blanking (as much as possible with the servo press available) using several punch motions, during one blanking stroke. The material used in these studies was 1.4 mm thick 780 MPa TRIP steel and the blanked hole had a diameter of 75 mm. The paper will review the results of this study where the holes were blanked at various punch speeds. The edge quality was examined at different locations of the blanked hole. Subsequently, the holes were expanded using hole flanging tests to determine the HER (Hole Expansion Ratio) for various blanking conditions. The experimental results showed that the effect of various punch speeds in blanking (within 7 mm/sec and 70 mm/sec) was relatively small while the concentricity of the punch/die assembly has a very significant effect on the location of crack initiation during the hole flanging operation.
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