在农机行业的日常生产中，经常遇到零件的被支承面是不规则形状的情况。通常的做法是尽量增大零件被支承部分的面积，从而增加装夹的稳定性和支承刚度，以减小加工时零件的受力变形，提高加工精度。但在实际工作中却有一些例外的情况。我们在加工如图的零件时，就遇到了上述情 In the daily production of agricultural machinery industry, often encountered parts of the supported surface is irregular shape of the situation. The usual practice is to try to increase the area of ​​the supported part of the part, thereby increasing the stability of the clamping and the supporting rigidity, so as to reduce the stress deformation of the part during processing and improve the processing precision. However, there are some exceptions to the actual work. We were experiencing the above situation while processing the parts as shown in the figure