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汽车座椅滑轨工作面宽度小,长度长,承载大,是汽车座椅中的重要安全件。滑轨翻边成形时,材料卸载后发生弹性回弹,导致成形精度下降。因此,采用仿真和实验相结合的方式研究高强度钢短立边长行程滑轨类零件直翻边成形过程中的材料回弹规律。基于Yoshida-Uemori本构模型,采用有限元仿真技术,研究了短立边长程直翻边成形过程中的回弹规律。对材料DP780、屈服强度880MPa、厚度1.6mm的板料进行了翻边实验。研究发现,板料回弹呈现三维特征,因此,提出了考虑板料横截面内回弹角度、最大偏差距离和纵向起伏量的材料回弹综合系数。此外,随翻边高度减小,材料回弹角度非线性增大;随板料纵向长度增加,成形面纵向起伏量大幅上升。
Car seat slide rail face width, length, bearing large, is an important seat in the car safety parts. Slide flange forming, the material unloaded after the elastic rebound, resulting in decreased precision. Therefore, by means of a combination of simulation and experiment, the law of material rebound during the forming process of straight flange of high strength steel with short side length and long stroke rail was studied. Based on the Yoshida-Uemori constitutive model, the springback law in the process of forming the long flange with straight flange was studied by finite element simulation. On the material DP780, yield strength of 880MPa, thickness of 1.6mm plate flanging experiments. The research shows that the rebound of the sheet exhibits three-dimensional characteristics. Therefore, the composite coefficient of rebound of the material considering the rebound angle, the maximum deviation distance and the longitudinal undulation in the cross-section of the sheet is proposed. In addition, as the flange height decreases, the material rebound angle increases nonlinearly. With the increase of the longitudinal length of the sheet, the longitudinal undulation of the forming surface increases greatly.