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Investigation of Effects of Strip Metals and Relative Sliding Speeds on Friction Coefficients by Reversible Strip Friction Tests

Department of Mechanical and Electro-Mechanical Engineering, National Sun Yat-sen University, No. 70, Lein-Hai Rd., Kaohsiung 804, Taiwan
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Metals 2020, 10(10), 1369; https://doi.org/10.3390/met10101369
Received: 12 September 2020 / Revised: 10 October 2020 / Accepted: 10 October 2020 / Published: 14 October 2020
(This article belongs to the Special Issue Latest Hydroforming Technology of Metallic Tubes and Sheets)
Friction at the interface between strips and dies is an important factor influencing the formability of strip or sheet forming. In this study, the frictional behaviors of strips at variant speeds were investigated using a self-developed strip friction test machine with a dual tension mechanism. This friction test machine, stretching a strip around a cylindrical friction wheel, was used to investigate the effects of various parameters, including sliding speeds, contact angles, strip materials, and lubrication conditions on friction coefficients at the strip–die interface. The friction coefficients at the strip–die interface were calculated from the drawing forces at the strip on both ends and the contact angle between the strip and die. A series of friction tests using carbon steel, aluminum alloy, and brass strips as the test piece were conducted. From the friction test results, it is known that the friction coefficients can be reduced greatly with lubricants on the friction wheel surface and the friction coefficients are influenced by the strip roughness, contact area, relative speeds between the strip and die, etc. The friction coefficients obtained under various friction conditions can be applied to servo deep drawing or servo draw-bending processes with variant speeds and directions. View Full-Text
Keywords: strip friction test; friction coefficient; surface roughness; sliding speed; contact pressure strip friction test; friction coefficient; surface roughness; sliding speed; contact pressure
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Hwang, Y.-M.; Chen, C.-C. Investigation of Effects of Strip Metals and Relative Sliding Speeds on Friction Coefficients by Reversible Strip Friction Tests. Metals 2020, 10, 1369.

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