影响板材折弯回弹因素的研究

回弹是影响板材折弯精度的主要因素，文章根据实际生产建立了比较合理的自由折弯冲压加工简化模型，提出 了基于ANSYS Workbench准静态模块的分析方法，对建立的简化模型进行了主要工艺参数的有限元模拟分析。通过控 制变量法，分析板厚、下模开口大小和下压量对回弹的影响。研究表明回弹大小随着板材厚度的增加减小，随着下模开 口的增大而增大，随着下压量的增加而减小。进行了相关折弯实验，实验结果表明有限元分析结果符合实际。研究板材 折弯时应考虑成型角度、板材厚度以及下模开口大小等因素的影响。

Study on Factors Influencing Bending Springback of Sheet Metal

Springback is the main factor which influences the bending accuracy of sheet metal. In this paper a reasonable simplified model of the freedom stamping bending was established on the basis of the actual production. Analytical method was proposed based on ANSYS Workbench quasi static. to analyze the main process parameters of the model by the FEM. Controlling variable method was adopted to research the influence of thickness of sheet metal. the amount of press and the size of die on bending springback of sheet metal. The result showed that the increase of thickness or the amount of press would lead to the decrease of springback; the more was the size of die, the bigger was the springback. Through experimental verification. the simulation results were demanded to fit into the reality. The factors of thickness. the amount of press and the size of die must be considered when studying on the sheet bending.