粉末冶金件表面滚压塑性变形强化过程的数值模拟
Numerical Simulation of Powder Metallurgy Components Strengthened by Surface Rolling
毛华杰， 沈小燕
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作者单位：（武汉理工大学 材料科学与工程学院，湖北 武汉 430070）
中文关键字：粉末冶金材料； 表面滚压； 密度； 有限元； MSC.Marc
英文关键字：PM materials; surface rolling; density; FE; MSC.Marc
中文摘要：针对粉末冶金件的表面滚压强化工艺，结合粉末冶金材料的塑性理论，运用MSC.Marc有限元软件，通过正确建立有限元模型，比较分析了不同进给量、滚压转速和摩擦系数对相对密度分布的影响及变化规律。结果表明，表面滚压可以有效提高粉末冶金件的表面区密度。适当提高进给量、滚压转速和摩擦系数，将有利于相对密度的提高。在工艺设计中应按实际加工条件和保证表面质量的前提下，适当选择这些工艺参数。同时，所述建模与模拟方法为粉末冶金材料的数值模拟提供了一种合理的研究思路。
英文摘要： Combining the analysis of PM(Powder Metallurgy) plastic theory, the MSC.Marc FE method was used for the numerical simulation of PM components which were strengthened by surface rolling processing technique. Based on establishing FE model correctly, the influencing and variation law of relative density under the influence of different conditions, such as amount of feed, rotate speed and friction coefficient, were compared and analyzed. The results indicate that surface rolling can efficiently increase surface density of PM components. Increasing the amount of feed, rotate speed and friction coefficient properly can be of advantage to densification. It is supposed to choose these parameters suitably during technological design according to the practical processing conditions and surface quality requirements. The methods of modeling and simulation can provide a reasonable research technique for numerical simulation of PM materials.