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杯—杯类或杯—杆类复合冷挤压在生产中已得到比较广泛的应用,但至目前为止,无论国际国内,都还没有建立起复合挤压单位挤压力的计算公式。定性的看法也不全相同,有的认为单位复挤压力总是小于分解后的纯反挤单位压力,也有人认为,单位复挤压力总是介于分解后的正反挤压力之间,而且接近于两者中的大者等等。试图建立单位复挤压力计算公式的主要困难在于:
Cup-cup or cup-rod composite cold extrusion has been widely used in the production, but so far, no matter at home and abroad, have not established the formula of extrusion unit extrusion pressure. The qualitative view is not all the same, and some believe that unit squeeze pressure is always less than the pressure of the pure anti-squeeze unit after decomposition, while others think that unit squeeze pressure always lies between the positive and negative squeeze forces after decomposition , And close to the larger of the two and so forth. The main difficulty in trying to establish the formula for unit squeeze pressure is: