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一、反挤压力的计算方程反挤压时可以看到,凸模进入坯料以后,坐标网的水平线将被拉伸,弯曲出现在图1中曲线a、b之间,形状也与a、b相仿。水平网线之间的压缩表明,材料沿a、b线流动,从水平方向开始到垂直向上流出,流动方向大约转了90°。反挤压的变形区是在凸模端面下的一段距离h内,h以下可以看作不变形的刚性区,由此,可以建立如图2所示的模型,把直径为d、高为A的变形区看作圆柱镦粗,从而建立如
First, the calculation of anti-extrusion pressure Anti-extrusion can be seen after the punch into the blank, the horizontal coordinate network will be stretched, the curve appears in Figure 1 curve a, b between the shape and a, b is similar. Compression between the horizontal wires indicates that the material flows along lines a and b, starting from the horizontal to the vertical and upward, with the flow direction turning about 90 °. The deformation area of the anti-extrusion is within a distance h under the end face of the punch. The following h can be regarded as a non-deformable rigid zone. Thus, a model as shown in FIG. 2 can be established, in which the diameter is d and the height is A Deformation zone as a cylinder upset, thus establishing such as