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Influence of die parameters on internal voids during multi-wedge-multi-pass cross-wedge rolling

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Abstract

The formation of internal voids in workpieces during cross-wedge rolling affects die design and limits their widespread applications. This article investigated the formation of internal voids during the multi-wedge-multi-pass rolling production of connecting rods. A three-dimensional numerical simulation model of cross-wedge rolling (CWR) was established using the rigid-plastic finite element method, and a density change model of the porous material was developed to characterize the degree of internal void formation in the connecting rod during CWR. The optimal die parameters (forming angle, spreading angle, and distribution coefficient of area reduction) were determined by determining their relationship to the density. The stress and strain of characteristic points near the loose longitudinal sections were used to study the void formation mechanisms. The accuracy of the numerical simulations was verified by rolling experiments, which showed no void formation in the internal sections of the connecting rod after production, confirming the feasibility of using this scheme to prevent void formation.

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Funding

This work was supported by the National Nature Science Foundation of China (Grant No. 51665032), Science Foundation for Distinguished Young Scholars of Gansu Province (Grant No. 18JR3RA134), and Lanzhou University of Technology Support plan for Excellent Young Scholars (Grant No. CGZH001).

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Authors and Affiliations

  1. School of Material Science and Engineering, Lanzhou University of Technology, Lanzhou, 730050, China

    Zhi Jia, Yanjiang Wang & Baolin Wei

  2. State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals, Lanzhou University of Technology, No. 287 Langongping Road, Qilihe District, Lanzhou, 730050, China

    Zhi Jia

  3. School of Materials Engineering, Lanzhou Institute of Technology, Lanzhou, 730050, China

    Jinjin Ji

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  1. Zhi Jia
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  2. Jinjin Ji
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Correspondence to Zhi Jia.

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Jia, Z., Ji, J., Wang, Y. et al. Influence of die parameters on internal voids during multi-wedge-multi-pass cross-wedge rolling. Int J Adv Manuf Technol 110, 1295–1304 (2020). https://doi.org/10.1007/s00170-020-05897-4

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  • DOI: https://doi.org/10.1007/s00170-020-05897-4

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