Journal of South China University of Technology (Natural Science Edition) ›› 2015, Vol. 43 ›› Issue (10): 89-94.doi: 10.3969/j.issn.1000-565X.2015.10.013

• Mechanical Engineering • Previous Articles     Next Articles

Investigation into Combined Process of Extrusion and Upsetting Extrusion for Thick Sheet with Rectangular Edge Convexity

Xia Qin-xiang1 Hu Xuan-tong1 Chen Deng2 Qu Hong-bo2   

  1. 1． School of Mechanical and Automotive Engineering，South China University of Technology，Guangzhou 510640，Guangdong， China; 2． Guangzhou Huaguan Fineblanking Components Co． ，Ltd． ，Guangzhou 510420，Guangdong，China
  • Received:2015-05-15 Revised:2015-07-16 Online:2015-10-25 Published:2015-09-06
  • Contact: 夏琴香( 1964-) ，女，教授，博士生导师，主要从事塑性加工及模具计算机技术研究 E-mail:meqxxia@scut.edu.cn
  • About author:夏琴香( 1964-) ，女，教授，博士生导师，主要从事塑性加工及模具计算机技术研究
  • Supported by:
    Supported by Comprehensive Strategic Cooperation Program of Guangdong Academy of Sciences( 2012B091100251)

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Abstract: In the investigation，a combined process of extrusion and upsetting extrusion is proposed by analyzing the forming technologies of the parts with rectangular edge convexity． Then，the extrusion and upsetting extrusion processes of the rectangular edge convexity are respectively simulated by using the finite element analysis software Deform-3D and by means of the rigid-plastic finite element analysis method． Simulation results show that the proposed combined process can achieve the convexity with rectangular edges，and that，during the extrusion process， the larger boss height of the anti-push punch is，the smaller the convexity edge fillet will be，which is more beneficial to form the rectangular edge convexity． It is also found that smaller boss height of the anti-push punch causes the crack defects to occur more easily on the hole wall and the end face of the convexity． According to the simulation results，a set of stamping dies are designed and manufactured，so as to verify the forming process of the convexity by experiments． The results show that the experimental results accord well with the simulation ones，and that the crack defects can be effectively reduced by increasing the punch fillet radius and by adopting the lubricating oil．

Key words: thick sheet, rectangular edge convexity, combined process, extrusion, upsetting extrusion

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