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针对内部多台阶并且精度尺寸要求高的半轴套管,本文提出了镦粗、反挤压杯形、冲孔正挤压及扩孔整形的成形新工艺,并进行了实际生产。对新工艺开发过程中出现的圆角充不满、连皮无法完全冲出以及底部裂纹或折叠等缺陷产生的原因进行了分析,提出了相应的解决措施:通过增加2mm正挤压件上端尺寸,实现了圆角充满;利用有限元数值模拟确定了连皮冲不掉的原因,并通过提高反挤压工序的设备吨位解决了此问题;通过对挤压件设置追踪点反向追踪缺陷位置,完成裂纹缺陷的处理。
For the semi-axial bushing with many internal steps and high precision dimension requirements, a new forming process of upsetting, anti-extrusion cup, punching positive extrusion and reaming was put forward and the actual production was carried out. The reasons for the defects such as the fillet filling in the development of the new process, the incomplete penetration of the skin and the crack or folding at the bottom are analyzed, and the corresponding solutions are put forward: by increasing the size of the upper end of the 2 mm positive extrusion, And the fillet filling is realized. The reason why the skin can not be cut off is determined by the finite element numerical simulation. The problem is solved by increasing the equipment tonnages in the anti-extrusion process. By locating the tracking points on the extrusion, Complete crack defect handling.