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摘要：
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摩擦对各种塑性加工有着极大的影响。本文采用圆柱坐标系分析了扩径时的应力应变,得出了与摩擦系数有关的应力数学表达式。同时,分析了摩擦对弯曲中性层的影响,得出了相对半径与摩擦系数的关系式,以及摩擦对制件壁厚均匀程度和口部拉裂的影响。通过采用不同的润滑剂来控制摩擦系数,可以得出不同的相对半径值,最后得出最佳摩擦值为0.15~0.3。
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Friction has a great influence on the material plastic forming.The stress-strain condition was analyzed by the cylindrical coordinate during expanding.The stress-strain mathematical expression about friction coefficient was obtained,the effect of friction on the neutral layer was analyzed,and the expressions between relative radius and friction coefficient were gained.The influences of friction on wall thickness uniformity was analyzed and the rips at the end were educed.The different relative radius can be achieved through the friction coefficient control using different lubricants.Optimum friction value of 0.15~0.3 was finally set up.
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基金项目：
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河南省自然科学基金资助项目(20060203)
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作者简介：
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参考文献：
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