Title: An integrated cost model for metal cutting operations based on engagement time and a cost breakdown approach

Authors: Jan-Eric Ståhl

Addresses: Division of Production and Materials Engineering, Lund University, P.O. Box 118, 221 00, Lund, Sweden

Abstract: In all manufacturing processes, it is important to determine the costs and their distribution between different sequential processing steps. A cost equation based directly on the losses during manufacturing, such as rejection rate, stops and waste of workpiece materials, also provides a valuable aid in giving priority to various development activities and investments. The present work concerns how a cost model presented earlier for calculating part costs can be developed to describe part costs as a function of the cutting data and tool life time T selected. This enables a tool life model to be a directly integrated into the cost model by use of tool engagement time. The model presented also takes into account the part costs for scrap incurred in connection with forced tool changes. Examples are also given of how the model developed can be used in the economic evaluation of various cutting tools and workpiece materials. [Received 20 April 2017; Accepted 22 April 2017]

Keywords: cost model; cost breakdown approach; metal cutting; Colding equation; tool life; cutting data.

DOI: 10.1504/IJMR.2017.088397

International Journal of Manufacturing Research, 2017 Vol.12 No.4, pp.379 - 404

Received: 20 Apr 2017
Accepted: 22 Apr 2017

Published online: 05 Dec 2017 *

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