On critical surface strain during hot forging of lubricated aluminum alloy
- Lee, SeongWon; Lee, JungMin; Joun, ManSoo
- Issue Date
- ELSEVIER SCI LTD
- Critical surface strain; Aluminum hot forging; Coulomb' s law of friction; Solid-film lubrication
- TRIBOLOGY INTERNATIONAL, v.141
- Journal Title
- TRIBOLOGY INTERNATIONAL
- We present a new concept of critical surface strain to evaluate the lubrication-effective limit for process design in metal forming. Finite-element predictions obtained at various fixed Coulomb friction coefficients were compared in hot-forging experiments of a passenger car piston fabricated from short cylindrical aluminum alloy specimens well-lubricated with a solid film of water-dispersed lubricant. The Coulomb friction coefficient was formulated as a function of temperature, pressure, and material strain, and optimized by minimizing the difference between the predicted and experimental results. We established that the effect of surface strain dominated the metal-forming process, and that the optimized Coulomb friction coefficient changed abruptly at the critical surface strain at which the solid lubricating film used in the process is suddenly disrupted.
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- 공학계열 > Division of Mechanical and Aerospace Engineering > Journal Articles
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