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为减少某型轿车门框的三维拉弯回弹,通过单向拉伸试验,获得了SPCC材料的弹性模量、抗拉强度、屈服强度、应变硬化模量等材料的力学性能参数和真实的应力-应变曲线方程。基于板料弯曲回弹计算,给出了拉弯件内层材料的回弹前和回弹后曲率半径的关系以及回弹半径的表达式。在此基础上,提出将工件形线离散化,计算工件回弹前的形线方法,确定拉弯模形线,并进一步绘制拉弯模外形。根据理论分析结果,设计门框的三维拉弯模具,进行拉弯试验,并得到了合格的工件,验证了该方法适用于拉弯模具的设计。
In order to reduce the three-dimensional bending-bending rebound of a car door frame, the mechanical properties of the materials such as the elastic modulus, tensile strength, yield strength, strain hardening modulus and the real stress - Strain curve equation. Based on the calculation of sheet bending springback, the relationship between the springback radius and the springback radius before the springback is given. On this basis, it is proposed to discretize the workpiece shape line, to calculate the shape line method before the workpiece rebound, to determine the bending line shape, and to further draw the drawing form. According to the theoretical analysis results, the three-dimensional bending mold of the door frame is designed, the bending test is carried out, and the qualified workpieces are obtained, which proves that the method is suitable for the design of the bending mold.