A STUDY ON THE ULTRA PRECISION PROGRESSIVE DIE MAKING FOR SHEET METAL FORMING BY COMPUTER SIMULATION

摘要

The result of this study was obtained as follows. 1. Even in small details of production part, it could be considered sincerely. For the increasing of material using ratio, productivity, smoothing of strip feeding on the die block surface, and balancing of bending power, it could be fine method that is two lines blankrndisposition type strip process layout with 9 stages. Also it was applied to reduce the spring back phenomena by coining type punch shoulder. Then, it could be performed DEFORM simulation before the strip process layout design, die making, tryout and its revision through the analysis of actual production part. Upper methods produced outcome to coincide between simulation and tryout.rn2. Under the condition of clearance of bending site 5～10% aided to material thickness of production part and die radius 2.0_3.0 times of material thickness of production part, the out view of actual production part was satisfied and the coining site of bending to 0.1_0.15 times of material thickness of production part was brought into existence in allowing tolerance.rn3. It was possible that the prediction of result of tryout was successful through the FEM simulation. Also it could be done the optimizing design of strip process layout for the satisfied die making and tryout through the computer simulation