The goal of the present research was to develop an industrially applicable software tool that automatically alters the deep drawing tools, so that springback is compensated. Two different ways of geometric optimization are presented, the smooth displacement adjustment (SDA) method and the surface controlled overbending (SCO) method. Both methods use results from a finite elements deep drawing simulation for the optimization of the tool shape and have been proven to be effective in compensating springback in industrial products (hat-profile). The SDA and SCO methods, however, have their limitations. With the SDA method, the approximation/extrapolation function filters out detailed information in the shape modification field. Therefore, the shape modification possibilities are limited, and the effectivity will be lower than the standard DA method. When the degree of the polynomials is raised, more details are captured, but instabilities occur. With the SCO method, the control surfaces only allow 'quasi 2D' shape modifications, such as bending, or the application of torsion and camber. But if the control surface must contain many control points the springback compensation will be unstable. Most likely, the algorithms need to be applied iteratively to obtain maximum effect. Although the simulations need to become much more reliable, the experiences and results provide a promising outlook for the future.
The development of a finite elements based springback compensation tool for sheet metal products
Journal of Materials Processing Technology ; 169 , 1 ; 115-125
2005
11 Seiten, 16 Bilder, 18 Quellen
Article (Journal)
English
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