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Analytical contact pressure model for predicting roughness of ball burnished surfaces.pdf

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Analytical contact pressure model for predicting roughness of ball burnished surfaces.pdf

Journal of Materials Processing Technology 232 (2016) 63–77 Contents lists available at ScienceDirect Journal of Materials Processing Technology journal homepage: /locate/jmatprotec Analytical contact pressure model for predicting roughness of ball burnished surfaces Lars Hiegemann ?, Christian Weddeling, A. Erman Tekkaya Institute of Forming Technology and Lightweight Construction, TU Dortmund University, Baroper Stra?e 303, 44227 Dortmund, Germany article info Article history: Received 15 September 2015 Received in revised form 22 January 2016 Accepted 23 January 2016 Available online 27 January 2016 Keywords: Ball burnishing Contact pressure Analytical model Prediction of roughness abstract Within this work, an analytical model to predict the roughness after a ball burnishing process for thermally coated surfaces is developed. For this purpose, ?rst a model is derived which determines the contact pressure between rolling ball and workpiece. By extending a previously developed model and by using the calculated contact pressure the prediction of the roughness after a rolling process of total areas without conducting experimental preliminary tests becomes possible. The model and the assumptions are veri?ed in experimental studies for various rolling parameters and materials. The agreement between the calculated values and the experiments is suitable. Furthermore, a discussion of the in?uence of the individual parameters is carried out based on the developed model. ? 2016 Elsevier B.V. All rights reserved. 1. Introduction Ball burnishing is a post treatment process to smooth rough surfaces. It is commonly used as alternative to grinding offering the advantages of short processing times, the generation of compressive residual stresses which are favorable for wear resistance, and cold work hardening of the surface (Broszeit and Steindorf 1989). One area of application for a ball burnishing process is the smoothing of thermally coated surfaces. Such coated surfaces are