Research On AHSS Deforming Compensation Method Based-on Springback Curve

Recent years, since societies pay more attention on energy conservation and security of the automobile, the AHSS becomes widely used on the automobile industry. how ever, although the tensile strentgth of AHSS is higher than normal steel, but the springback problem is more serious in AHSS-forming, this becomes a restriction of the AHSS application. The traditional method, for example, craft-controling method, over-bending method and pressurization-correcting method, could not perfectly solve the AHSS springback problem, even the workfield trail/error test compensation method could not solve the problem either. therefore, we need to develop a new method to solve the problem.This paper, based on the currently most common used deforming compensation method, developed a new concept for series components, springback curve and optimal springback curve, the optimal springback curve was applied to divided the coordinateplane of springback curve, combined with wordfield craft-congroling method and compensation method, the paper developed both direct method and iterative method for the deforming compensation of springback curve. An CAE simulation system was used to demonstrate the process of driect compensation and springback curve generation based on real workfield data. The interative compensation method of springback curve, based on the CAE simulation system and rapid mold, was successfully applied on CP2 of Changfeng factory and perfectly was uesd to solve the AHSS deforming compensation problem.The method proposed by author was developed on real experimental data, the debugging data of mold and the CAE simulation data, which is an improvement of worfield trial and error test, it does not directly rely on the accuracy of CAE simulation system. According to the research, the springback curve reflected the tendency of springback-changing on a series of components, by used the tendency of changing to estimate the springback compensation, both the problem of dependent too much on the workfield trial and error test, and the problem of the low accuracy of CAE simulation are overcame. The method of springback curve which is developed by author means certain theory significance and practical value.