Journal of South China University of Technology (Natural Science Edition) ›› 2010, Vol. 38 ›› Issue (2): 49-54.doi: 10.3969/j.issn.1000-565X.2010.02.010

• Mechanical Engineering • Previous Articles     Next Articles

Spin-Forming Mechanism of Cup-Shaped Thin-Walled Trapezoidal Inner Gear

Sun Ling-yan  Ye Bang-yan  Hao Shao-hua  Xia Qin-xiang   

  1.  School of Mechanical and Automotive Engineering, South China University of Technology, Guangzhou 510640, Guangdong, China
  • Received:2009-02-23 Revised:1900-01-01 Online:2010-02-25 Published:2010-02-25
  • Contact: 夏琴香（1964-），女，教授，博士生导师，主要从事模具计算机与塑性加工研究．E—mail：meqxxia@scut．edu．cn E-mail:linnsun@163．com
  • About author:孙凌燕（1974-），女，博士生，主要从事模具计算机与塑性加工研究．
  • Supported by:

    国家自然科学基金资助项目（50475097）;广东省自然科学基金资助项目（04105943）;广东省科技计划项目（2006B11901001）

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Abstract:

As compared with the conventional flow forming of tube-shaped parts, the spin-forming of cup-shaped thin-walled trapezoidal inner gear is more complicated. In order to improve the forming quality of inner gears and lay a foundation for the selection of forming parameters, numerical simulation and processing experiment were performed to analyze the material flow during the spinning and the corresponding forming mechanism. The results show that （ 1 ） the spin-forming of inner gears is an upset-extrusion process ; （2） the deformation distribution is periodical, nonuniform and dissymmetric ; （3） the forming of gear tooth is influenced by the rotation direction of the main spindle, and forming defects easily occur during the spinning.

Key words: spinning, trapezoidal inner gear, forming mechanism, material flow, computer simulation