Title: Incremental versus continuous load-lubrication procedure in the determination of friction conditions by the ring compression test

Authors: Ana María Camacho; Jesús Valero; Marta María Marín; Juan Claver

Addresses: Department of Manufacturing Engineering, National Distance University of Spain (UNED), C/Juan del Rosal 12, Ciudad Universitaria, E 28040, Madrid, Spain ' Department of Manufacturing Engineering, National Distance University of Spain (UNED), C/Juan del Rosal 12, Ciudad Universitaria, E 28040, Madrid, Spain ' Department of Manufacturing Engineering, National Distance University of Spain (UNED), C/Juan del Rosal 12, Ciudad Universitaria, E 28040, Madrid, Spain ' Department of Manufacturing Engineering, National Distance University of Spain (UNED), C/Juan del Rosal 12, Ciudad Universitaria, E 28040, Madrid, Spain

Abstract: This work presents the differences found when using two types of methodology (continuous and incremental) in the application of load-lubricant during ring compression tests. Friction calibration maps have been obtained by conducting ring compression tests to flat rings of aluminium alloy UNS A97075-T6 with molybdenum disulphide (MoS2) as lubricant. Accordingly, in order to determine the particular values of the Coulomb friction coefficient, the problem was simulated using an elasto-plastic model with the finite element code Abaqus/Standard. A friction coefficients map from experiments and finite element simulation is drawn to compare the friction coefficient values derived from the continuous and incremental procedure. A comparison with experiments done with graphite powder as lubricant is also presented. Results of this investigation show that friction curves are affected by the methodology of load-lubricant application, and some guidelines about the use of these maps depending on the actual process conditions are provided.

Keywords: incremental forming; friction coefficient map; metal forming; lubrication; ring compression test; RCT; finite element method; Abaqus/Standard; experimental methodology; Coulomb friction coefficient.

DOI: 10.1504/IJMMS.2017.084377

International Journal of Mechatronics and Manufacturing Systems, 2017 Vol.10 No.1, pp.71 - 83

Received: 13 Apr 2016
Accepted: 04 Oct 2016

Published online: 25 May 2017 *

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