LAYER-BY-LAYER-REVERSE-PLANISH-ING BLANK ESTIMATION APPROACH
AND ITS IMPLEMENTATION

GUO Yuqin  LI Fuzhu  HE Chengwen

(College of Mechanical and Electrical Engineering, Xuzhou Normal University, Xuzhou 221116)

Abstract: Based on the hole-expanding forming theory in plastic mechanics, applying the layered idea, a layer-by-layer- reverse-planishing blank shape estimation approach is proposed for the complex cover panels with free form surface so that the blank shape estimation can be executed effectively. The present approach considers synthetically the influence of material mechanical properties, work-hardening effect and plastic deformation during cover panels forming on blank shape. Simultaneously, the base-surface idea of the section curve length development approach is adopted in order to determine the initial blank contour shape and position. Furthermore, by applying the continuity between adjacent layers during surface development- planish, this estimation approach develops a surface layer by layer according to the order of layering-planishing-expanding- re-layering. Therefore, it is expected to reduce effectively the amount of calculation and improve blank development efficiency. Finally, by comparing the blank area, material utilization ratio, and stamping test results of the example’s development result with ones of the given traditional blank shape, the validity and reasonability of the proposed blank estimation approach are verified.

Key words: Cover panels Blank shape estimation Stamping process Hole-expanding forming

CLC No: TP386

Received 20060625, received in revised form 20061211