Title: Optimisation of cutting conditions in machining of cobalt-based refractory material

Authors: N. Lebaal; D. Schlegel; M. Folea

Addresses: Mechatronics Methods Models and Skills Laboratory (M3M-E.A.3318), Research Institute on Transportation, Energy and Society (IRTES), Université de Technologie de Belfort-Montbéliard, Belfort cedex, 90010 France. ' Ecole Superieure des Technologies et des Affaires, 1 rue du Docteur Frery, 90000 Belfort – France. ' Department of Manufacturing Engineering, Faculty of Technological Engineering, 2200 Brasov, Romania

Abstract: Milling a cobalt-based refractory material has been very little studied being proved to be very expensive due to rapid toolwear. The aim of this work was cost optimisation of cutting conditions in slot milling with carbide tools. It used a Kriging interpolation technique of search space that avoids the local optima and decreases the function evaluation toward the global minimum. The objective and constraint functions taken into account were tool cost and surface roughness. Experimental results showed that optimal cutting conditions still led to an important abrasion of the tool, but minimised the adhesive wear at lower cutting speeds.

Keywords: machining; refractory materials; design of experiments; DOE; optimisation; response surface methodology; RSM; kriging interpolation; sequential quadratic programming; SQP; cobalt; cutting conditions; slot milling; carbide tools; tool wear; tool cost; surface roughness; surface quality; cutting speeds.

DOI: 10.1504/IJMPT.2012.048187

International Journal of Materials and Product Technology, 2012 Vol.44 No.1/2, pp.127 - 143

Received: 09 Feb 2011
Accepted: 07 Mar 2012
Published online: 17 Sep 2014 *

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