Journal of South China University of Technology (Natural Science Edition) ›› 2011, Vol. 39 ›› Issue (8): 1-6.doi: 10.3969/j.issn.1000-565X.2011.08.001

• Mechanical Engineering •     Next Articles

Optimization of Tooth Shape of Multi-Tooth Mandrel for Machining Axially Inner Micro Groove Copper Tube

Li Yong  Wang Xiu-kun  Zeng Zhi-xin   

  1. School of Mechanical and Automotive Engineering,South China University of Technology,Guangzhou 510640,Guangdong,China
  • Received:2011-01-17 Revised:2011-04-01 Online:2011-08-25 Published:2011-07-06
  • Contact: 李勇(1974-) ，男，博士，副教授，主要从事微成形及面向节能与新能源的设计与制造技术研究． E-mail:meliyong@scut.edu.cn
  • About author:李勇(1974-) ，男，博士，副教授，主要从事微成形及面向节能与新能源的设计与制造技术研究．
  • Supported by:

    国家自然科学基金资助项目( 50705031， 50975096) ; 广东省自然科学基金资助项目( S2011010002225) ; 中央高校基本科研业务费专项资金资助项目( 2009ZM0096) ; 广东省重大科技专项项目( 2010A080802009)

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Abstract:

The multi-tooth mandrel is used to machine the axially inner micro-grooved Copper tube ( AIGCT) ,and the geometric shape of the teeth directly affects the forming quality and the tool life. In this paper,based on both the characteristics of metal flow,which is presented by using the metallographic images of the rectangle tooth cross-section during the forming of AIGCT,and the boundary features of the forming zone of a single tooth,the forming zone is divided into four parts: rigid zoneⅠ,plastic deformation zone,rigid zone Ⅱand two compacted dead zones. Then,a mathematical model of the unit extruding force is established for the forming of tooth shape by means of the upper bound method,the mechanism of the process parameters affecting the unit extruding force is then analyzed,and the angle of optimal metal flow direction and the factors to influence the optimization are thus
solved. Finally,the parameters of tooth shape of the multi-tooth mandrel are optimized.

Key words: axially inner micro-grooved copper tube, multi-tooth mandrel, optimization, upper bound method