Journal of South China University of Technology(Natural Science Edition) ›› 2012, Vol. 40 ›› Issue (5): 1-6.

• Mechanical Engineering •     Next Articles

Forming Mechanism of 3D Integral Outside Fins Fabricated by Tool with Single Edge and Cone Extruding Face

Wan Zhen-ping  Qing Jian-bo  Fang Xiao-ming  Tang Yong   

  1. School of Mechanical and Automotive Engineering,South China University of Technology,Guangzhou 510640,Guangdong,China
  • Received:2011-11-28 Revised:2011-12-23 Online:2012-05-25 Published:2012-03-31
  • Contact: 万珍平(1971-) ，男，博士，副教授，主要从事面向节能与新能源的先进制造技术研究． E-mail:zhpwan@scut.edu.cn
  • About author:万珍平(1971-) ，男，博士，副教授，主要从事面向节能与新能源的先进制造技术研究．
  • Supported by:

    国家自然科学基金资助项目( 51075155) ; 国家重点基础研究发展计划项目( 2011CB710700)

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Abstract:

3D integral outside finned tubes were fabricated by using a tool with single edge and cone extruding face,and the forming process of fins as well as its dependence on the radius of cone extruding face was investigated. Then,the forming mechanism of fin micromorphology and the influences of cutting parameters on fin micromorphology were analyzed. It is found that,in the forming process,the surface metal material of workpiece only splits
rather than removes from the workpiece body,and the split chips are extruded into fins by the cone extruding face. The forming process of fins can be divided into three stages including splitting,sliding and fins forming,and big radius of cone extruding face contributes to the forming. Moreover,it is indicated that the microcrack to intersect the whole fin at the top makes the fin turn into double fins microscopically,and that the thickness of fins increases with the cutting depth and the pitch of fins increases with the feed.

Key words: integral outside fin, tool, single edge, cone extruding face, fin morphology, enhanced heat transfer

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