半轴套管精密挤压成形新工艺及应用  

Novel precision extrusion process of axle sleeve and its application

作　　者：郭永强[1] 徐春国[1] 崔继红 任广升[1] 任伟伟[1] 陈钰金[1] 

机构地区：[1]北京机电研究所,北京100083 [2]河北钢铁技术研究总院,河北石家庄050000

出　　处：《锻压技术》2012年第6期12-15,共4页Forging & Stamping Technology

基　　金：国家自然科学基金资助项目(51075024);国家高技术研究发展计划资助项目(2012AA040202)

摘　　要：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。A new process including upsetting, backward extrusion of cup-shaped, forward extrusion with piercing , reaming and sizing was proposed for axle sleeve that has multiple inner steps and high precision requirements, and the process had been used in real production. Furthermore, the reasons of defects, such as under filling of fillet, the situa- tion that the web could not be completely pierced and the crack appeared at the bottom during in the development of this novel process were analyzed. The corresponding solutions were put forward as follows. The fillet was fully filled by increasing 2 mm in length at the top of part. By using FEM the web could be completely pierced by improving press load of backward extrusion process. The crack defect location was founded by setting tracking points in the numerical simulation; therefore, the crack defect was completely resolved.

关 键 词：半轴套管 精密挤压 成形缺陷 

分 类 号：TG376[金属学及工艺—金属压力加工]