Effect of Tooling Temperature on the Transient Lubricant Behavior in Hot Metal Forming Processes |
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Authors: | Xiao Yang LeMeng Zhang Heli Liu Denis J. Politis Mohammad M. Gharbi Huifeng Shi LiLiang Wang |
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Affiliation: | 1. Department of Mechanical Engineering, Imperial College London, London, SW7 2AZ UK;2. Department of Mechanical and Manufacturing Engineering, University of Cyprus, Nicosia, 1678 Cyprus;3. Houghton Deutschland GmbH, Giselherstraße 57, 44319 Dortmund, Germany |
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Abstract: | In hot metal forming processes, the temperature of the forming tool progressively increases under serial production conditions. Water-based two-phase lubricants may be applied to cool the forming tool and moderate temperature, in which the liquid agent would evaporate or decompose rapidly with dry matter deposited on the tooling surface during the dwelling time before the forming process commences. Herein, an interactive friction model for a two-phase lubricant is developed to predict the transient lubricant behaviors, i.e., predicting the effects of tool temperature and dwelling time on the friction coefficient evolution and lubricant breakdown. Friction tests between a warm pin and hot aluminum workpiece are conducted using the advanced friction testing system, TriboMate, to validate the modeling results. |
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Keywords: | interactive friction models tooling temperatures transient lubricant behaviors two-phase lubricants |
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