左右制动器底板是CPQI型叉车制造部件中比较关键的零件之一。如图1所示,在离φ237外缘拉伸中心线85mm处需进行梯形盒拉伸成型,由于处在φ237外缘的边缘附近,必然存在着不同的成型状态,在成型部位的材料流动,应力应变分布也必然不同。同时φ237 The left and right brake pads are one of the more critical parts in the CPQI truck parts. As shown in Fig. 1, trapezoidal box stretch forming is required at a stretch of 85 mm from the centerline of the outer edge of φ237. Since the edge is near the outer edge of φ237, there are inevitably different forming states in which material flows at the forming portion, The distribution of stress and strain is also inevitable. At the same time φ237