Method of Obtaining Smooth and Precise Cut Surface of High Tensile Strength Steel Sheets

― A Study of Blanking High Strength Steel Sheets I ―

Abstract

Methods by which smooth and high-precision cut surfaces of high strength steel sheets with strength of up to 980MPa class have been investigated using a servo press in which the average punching speed can be varied from 2 to 140mm·s^-1. A method called finish blanking has been performed, and the other method called press shaving has also been conducted to obtain either smooth cut surfaces or highly precise product shapes and dimensional sizes. The results show that both methods can yield good cut surfaces if appropriate working parameters including punch/die clearance, edge radius and punching speed are used. However, as regards shape and dimensional accuracies, the press shaving method yielded the most satisfactory results.