A die design method for springback compensation based on displacement adjustment

Xiang An Yang, Feng Ruan
College of Electromechanical Engineering, Guangdong Polytechnic Normal University, GuangZhou 510635, China, Received 2 January 2010; revised 17 February 2011; Accepted 4 March 2011. Available online 16 March 2011.


Abstract

Springback is a major problem in sheet forming processes. This problem can be corrected by adjusting the tooling shape to the appropriate shape and/or active process control. In this paper, the focus will be on tooling shape design, of which compensation magnitude and compensation direction are the two important aspects. A new method, which takes compensation direction into account based on displacement adjustment, has been developed. The method, which we call “comprehensive compensation method” (CC) is general for it considers the fact that large rotation and displacement would occur during springback, which is more common for automotive panel stamping due to the application of advanced high strength steels (AHSS) and the complexity in automotive panel structure. An angle compensation factor was introduced to determine the compensation direction. Compared to the three existing methods, which compensate in different directions, the new method has a higher precision especially for complex panel with advanced high strength. Additionally, the suitability and application of those four methods is also discussed, along with the origin of the differences.

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