Development of Forming Condition Optimization Methodologyin Deep Drawing Process for Automotive Outer Parts

概要

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Sheet metal forming simulations are now widely used for predicting forming defects in the design of drawing dies for automotive panels. As a countermeasure against defects, however, performing a variety of simulations currently leads to the requirement of many man-hours since designers repeat the process of trial and error on the basis of their experience. A numerical optimization methodology has been recently applied to stamping in research. The optimization of forming conditions, such as the drawing bead force of actual parts and the blank size, has resulted in difficulties because it involves a large number of constraints such as formability and cost. Moreover, the objective function has multiple peaks. In this study focus on the independence of variables and develop a new method of searching the best feasible solution in the case of complicated design problems such as automotive panels. There are two steps in the developed method. 1) The optimization process is applied to the design variables with strongly related objective functions. 2) All design variables are optimized by considering all objective functions. This method was compared with optimization techniques such as simulated annealing. More optimal solutions for automotive parts can be obtained by applying the proposed method.
The Japan Society for Technology of Plasticityの論文