在理论上冷拉型钢的断面设计宁可有中间部分的容积。也不要向外扩展或者有过多的周边面积。如图所示的《六要六不要》现分述如下:图1:支腿太瘦,末端不能充满,多次拉拔也不能实现。图2:凹槽太宽且深度大,模具很容易破断。图3:末端不能充满,如需多次 In theory, cold-drawn steel section design rather than the middle part of the volume. Also do not scale out or have too much surrounding area. As shown in the figure, “six to six do not” are as follows: Figure 1: legs too thin, the end can not be filled, repeated drawing can not be achieved. Figure 2: The groove is too wide and deep, the mold is very easy to break. Figure 3: The end can not be filled, if necessary