一、前言 汽车后制动器底板(见图1)在汽车冲压件中是比较难加工的零件。它不仅形状复杂而且尺寸精度、形状误差要求较严,某些部位的圆角半径小于板料厚度。这就给冷压成形造成了一定的困难。特别是目前深拉深钢板供应紧张的条件下,要用塑性较差的A3钢板代替塑性较好的08F钢板,零件质 First, the foreword Rear brake brakes (see Figure 1) in the car stamping parts is more difficult to process parts. Not only is it complicated in shape and dimensional accuracy, the shape error requires more stricture, and the radius of fillet of some parts is smaller than the sheet thickness. This creates some difficulties in cold forming. In particular, the deep drawing of the current tight supply of steel conditions, the use of poor plasticity A3 steel instead of better plastic 08F steel, parts quality