超声辅助镦挤塑性成形过程材料变形模式研究

doi:10.3901/JME.2017.18.071

机械工程学报 ›› 2017, Vol. 53 ›› Issue (18): 71-78.doi: 10.3901/JME.2017.18.071

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超声辅助镦挤塑性成形过程材料变形模式研究

吴欣^1,2, 王志海¹, 杨世锡², 李峰³, 沈国强¹

1. 杭州电子科技大学机械工程学院杭州 310018;
2. 浙江大学机械工程学院杭州 310027;
3. 宁波双林汽车部件股份有限公司宁波 315613

收稿日期:2016-06-13 修回日期:2017-02-05 出版日期:2017-09-20 发布日期:2017-09-20
通讯作者: 沈国强(通信作者),男,1965年出生,副教授.主要研究方向为机械设计与仿真技术.E-mail:shen_guoqiang@yahoo.com
作者简介:吴欣,男,1979年出生,博士,讲师.主要研究方向为材料成形过程仿真技术,发表论文10余篇.E-mail:wuxin@hdu.edu.cn
基金资助:
国家自然科学基金（51475130）、中国博士后基金（2013M541769）和浙江省自然科学基金（LY14E050025）资助项目。

Study on Metal Forming Patterns of the Ultrasonic Vibration Assisted Upset-extruding Process

WU Xin^1,2, WANG Zhihai¹, YANG Shixi², LI Feng³, SHEN Guoqiang¹

1. School of Mechanical Engineering, Hangzhou Dianzi University, Hangzhou 310018;
2. School of Mechanical Engineering, Zhejiang University, Hangzhou 310027;
3. Ningbo Shuanglin Auto Parts Co., Ltd., Ningbo 315613

Received:2016-06-13 Revised:2017-02-05 Online:2017-09-20 Published:2017-09-20

摘要/Abstract

摘要： 从材料塑性变形的角度，结合试验和应力波理论，研究超声效应对于材料变形的影响规律，提出超声辅助镦挤过程中的材料变形模式。基于镦挤试验，研究材料铝的小孔填充能力和径向变形规律，试验结果表明超声辅助振动可以大幅提高小孔的填充能力和接触区域的径向变形量。利用扫描电镜测试手段，研究了镦挤成形工件的表面形貌，发现超声辅助塑性成形零件表面生成了高硬度的氧化铝膜。归纳总结超声辅助塑性变形过程中的变形模式，基于材料变形等效的原则，结合应力波理论和冲击动力学方法，认为超声辅助镦挤过程中的变形模式与材料塑性模量下降、接触区域摩擦因子下降和超声振动的间歇冲击有关。

关键词: 变形模式, 超声效应, 镦挤

Abstract: The ultrasonic vibration effects of the ultrasonic vibration assisted forming process are studied from the view of metal plastic deformation patterns. First, the small-hole filling capacity and radial flow rules are studied for the upset-extruding process. Experimental results show that the ultrasonic vibration can increase not only the length of extruded cylinder but also the radial deformation. The surface morphology of the deformed workpiece are studied by using scanning electron microscope, the data shows that the black material covered the workpiece surface is Al₂O₃. The metal deformation patterns of the ultrasonic vibration assisted forming process are proposed based the experimental observation. The cause of these metal deformation patterns are considered to have connections with the decrease of plastic modulus, improvement of frictional condition along workpiece-tool interface and intermittent impact of ultrasonic vibration.

Key words: deformation pattern, ultrasonic effect, upset-extruding deformation

中图分类号:

TG376

吴欣, 王志海, 杨世锡, 李峰, 沈国强. 超声辅助镦挤塑性成形过程材料变形模式研究[J]. 机械工程学报, 2017, 53(18): 71-78.

WU Xin, WANG Zhihai, YANG Shixi, LI Feng, SHEN Guoqiang. Study on Metal Forming Patterns of the Ultrasonic Vibration Assisted Upset-extruding Process[J]. Journal of Mechanical Engineering, 2017, 53(18): 71-78.

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超声辅助镦挤塑性成形过程材料变形模式研究

Study on Metal Forming Patterns of the Ultrasonic Vibration Assisted Upset-extruding Process

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