Patent ID: 6662610
Filing Date: 2003-12-16
Classification: B21D,Y10S

Abstract:
A bending method, comprising:creating a three-dimensional stereoscopic diagram including a desired bending angle based on graphic information of a product; obtaining a test piece of a material proposed for use in the product; bending the test piece, measuring bending angles before and after a load removal, and measuring an elongation amount of flange width due to the bending; calculating a spring back amount of the test piece from the measured bending angles of the test piece before and after the load is removed; obtaining an stroke value from the calculated spring back amount and obtaining a back gauge value from the measured elongation amount; bending a product piece based on the obtained stroke value and back gauge value; measuring a bending angle and a flange width of the product piece after a load for the bending is removed and determining whether the measured bending angle and the measured flange width of the product piece are within tolerances relative to the desired bending angle and a desired flange width; and terminating the bending when it is determined that the measured bending angle and the measured flange width of the product piece are within the tolerances; and when it is determined that the measured bending angle and the measured flange width of the product piece are not within the tolerances, obtaining a correction stroke value from a difference between the desired and measured bending angles of the product piece, obtaining a correction back gauge value from a difference between the desired flange width and the measured flange width, and performing corrective bending according to the correction values.