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挤压时,变形区的侧部边界表明金属周边层运动轨迹的特征,这与挤压制品的形状、工具、毛坯的温度场和接触摩擦的条件有关系。用平模进行正挤压时,对不同边界条件的变形区尺寸按滑移线网绘制图表的结果已在文献[2]中作了总结。为了研究工艺参数对用平模挤压铝合金时变形区侧部边界实保形状的影响,曾进行了试验—研究工作。确定了与所研究的挤压时刻相应的挤压工艺参数和金属宏观组织。采用各种工艺制度使未挤压毛坯留在挤压筒内140—160毫米时结束挤压。在与挤压筒距离100—150毫米处,将挤压制品切下,把未挤压毛坯从挤压筒内取出,并沿挤压中心线切开后,按低倍磨
During extrusion, the side boundaries of the deformation zone indicate the characteristics of the movement path of the metal perimeter, which is related to the shape of the extruded product, the temperature field of the blank, and the conditions of contact friction. In the case of positive extrusion with a flat die, the result of plotting the size of the deformation zone with different boundary conditions by slip line mesh has been summarized in [2]. In order to study the influence of process parameters on the real shape of the lateral boundary of the deformation zone when the flat die is extruded with aluminum alloy, experiments and research work have been carried out. The extrusion process parameters and metal macro-structure corresponding to the studied extrusion time were determined. Using a variety of processes so that the extrusion does not leave blank extrusion cylinder 140-160 mm when the end of extrusion. In the distance from the extrusion cylinder 100-150 mm, the extruded product is cut, the unpressurized blank removed from the extrusion cylinder and cut along the extrusion center line, according to the low magnification mill