Part shape deviation caused by spring back is a quality problem in sheet metal forming.There are two major approaches,adjusting tooling shapes and adopting process control.This paper focused on tooling contour design.A new die design approach,called global compensation method(GC),has been proposed and it possesses following advantages.Compensation factor in displacement adjustment method(DA)is extended to a compensation matrix,thus every node has its own compensation magnitude and compensation direction,which are related to the global forming error.
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