Journal of South China University of Technology (Natural Science Edition) ›› 2014, Vol. 42 ›› Issue (11): 14-18,24.doi: 10.3969/j.issn.1000-565X.2014.11.003

• Mechanical Engineering • Previous Articles     Next Articles

Folding Criterion of Die Block Forging of 5CrNiMo During Stretching

Zhao Xue-zhi1 Fan Yan-bo1 Xia Qin-xiang1 Lü Ming- ke2   

  1. 1.School of Mechanical and Automotive Engineering,South China University of Technology,Guangzhou 510640,Guangdong,China; 2.Shaoguan Zhongji Heavy Forging Co.,Ltd.,Shaoguan 512000,Guangdong,China
  • Received:2014-05-21 Revised:2014-07-21 Online:2014-11-25 Published:2014-11-17
  • Contact: 夏琴香(1964-)，女，博士，教授，博士生导师，主要从事塑性加工研究． E-mail:meqxxia@scut.edu.cn
  • About author:赵学智(1970-)，男，博士，教授，博士生导师，主要从事塑性加工研究．E-mail:mezhaoxz@scut．edu．cn
  • Supported by:

    国家自然科学基金资助项目(51375172);韶关市科技计划项目(2011CXY/C15)

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Abstract:

In order to reveal the effects of reduction and feed amount on the surface quality of forgings during the stretching,and to establish a criterion judging the occurrence of stretching folding,a stretching model of 5CrNiMo die block forgings is constructed by means of the FEM software DEFORM- 3D,and the effects of the reduction- to- feed amount ratio (namely the M value) on the maximum folding corner and the folding depth are discussed.It is found that the stretching folding occurs at a critical M interval of 0.8 ～1.0.On this basis,a criterion to judge the occurrence of folding during the stretching is established,that is,the folding of forging surfaces can be avoided when M is less than the range of 0.8 ～1.0,while the folding occurs when M is within or exceeds the range of 0.8 ～1.0.

Key words: 5CrNiMo, die block forging, stretching, folding criterion, DEFORM- 3D

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