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Failure mechanisms and structural optimization of shredder hammer for metal scraps

  • Vehicle Engineering
  • Published:
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Abstract

Recycling retired cars can relieve the environmental pollution and resource waste efficiently. However, a few publications can be found on the failure mechanisms and optimization method of recycling equipment, shredders. Thus, the failure mechanisms and structural optimization of shredder hammers for retired cars are studied aiming improving shredding efficiency and reducing cost. Failure types of shredder hammer are studied theoretically, and it is found that wear failure and fatigue failure are the two main failure types of shredder hammer. The shredding process of metal scraps is analyzed by finite element method, and it can be divided into four stages based on the stress states: initial stage, collision stage, grinding stage and separation stage. It is proved that the shredding efficiency can be improved by increasing cutouts on the hammer head. Finally, it is determined that the hammer with two cutouts is the optimal structure for metal scraps, which can improve the shredding efficiency by 20% and lengthen the hammer life by 15%. This study provides scientific basis for the industry application and theoretical foundation for further research.

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Author information

Authors and Affiliations

  1. Hubei Key Laboratory of Advanced Technology for Automotive Components, Wuhan University of Technology, Wuhan, 430070, China

    Xianyan Zhou, Zhili Hu, Xunpeng Qin & Lin Hua

  2. Hubei Lidi Machine Tool Company Limited, Yichang, 443000, China

    Yijun Tao

Authors
  1. Xianyan Zhou
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  2. Zhili Hu
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  3. Yijun Tao
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  4. Xunpeng Qin
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  5. Lin Hua
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Corresponding author

Correspondence to Lin Hua.

Additional information

Supported by Innovation Team Development Plan(Grant No. IRT13087), Major Scientific and Technological Innovation Project in Hubei Province, China(Grant No. 2015AAA014), and Fundamental Research Funds for the Central Universities, China(Grant No. 2015-yb-010)

ZHOU Xianyan, born in 1991, is currently a PhD candidate at Hubei Key Laboratory of Advanced Technology for Automotive Components, Wuhan University of Technology, China. She received her bachelor degree from Wuhan University of Technology, China, in 2013. His research interests include modern automotive design and manufacture.

HUA Lin received his MS degree in pressure processing from Wuhan University of Technology, China, in 1985. He received his PhD degree in mechanical engineering from Xi’an Jiaotong University, China, in 2000. He is currently a dean at School of Vehicle Engineering, Wuhan University of Technology, China. His research interests include advanced forming and equipment technology.

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Zhou, X., Hu, Z., Tao, Y. et al. Failure mechanisms and structural optimization of shredder hammer for metal scraps. Chin. J. Mech. Eng. 29, 792–801 (2016). https://doi.org/10.3901/CJME.2016.0415.053

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  • DOI: https://doi.org/10.3901/CJME.2016.0415.053

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