对于一定的板金,有其最小的极限或许用压延系数m。m值规定后,零件各尺寸之间应保持一定的关系。在零件设计中,可以利用这些关系,既保证压延可以顺利进行,又满足零件的使用要求。例如当规定m=0.55时,由图1对于一定的h/d_o=0.38和(r_1+r_2)/d_o=0.2的情况下,d/d_o不能大于1.45。图中用虚线表示的最大压延力,是在压 For a certain sheet metal, there is a minimum limit which may be a rolling factor m. After the m value is specified, there should be a certain relationship between the dimensions of the parts. In the design of parts, these relationships can be used to ensure that rolling can be carried out smoothly and meet the requirements for the use of parts. For example, when m=0.55 is specified, d/d_o cannot be greater than 1.45 from the case of FIG. 1 for a certain h/d_o=0.38 and (r_1+r_2)/d_o=0.2. The maximum rolling force shown in dotted lines in the figure is