Effect of friction on equal channel angular extrusion process
(1.山东省威海市哈尔滨工业大学材料科学与工程学院2.上海市上海交通大学机械与动力工程学院3.School of Mechanical and Power Engineering, Shanghai Jiaotong University, Shanghai 200030, China)
Abstract: The influence of the friction between deformed material and die wall during equal channel angular extrusion (ECAE) was studied. Because of the special design of the extrusion die, the direction of the frictional force has been altered and the distribution of the strain field has been uniformed. The results of the finite element analysis(FEA) indicate that the homogeneity of the finial deformation has been greatly enhanced with this method provided. The ratio of maximum strain to minimum strain along the width is reduced from 6.39 to 1.03. Along the billet length, the strain homogeneity region increases more obviously and the strain is uniformed more greatly than that of common extrusion. The lubrication before extrusion reduces greatly or even it is ignored, which has a great significance for the industrial application of ECAE.
Key words: equal channel angular extrusion； friction； finite element method