Therblig-embedded value stream mapping method for lean energy machining

Jia, S., Yuan, Q., Lv, J., Liu, Y. , Ren, D. and Zhang, Z. (2017) Therblig-embedded value stream mapping method for lean energy machining. Energy, 138, pp. 1081-1098. (doi:10.1016/j.energy.2017.07.120)

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Abstract

To improve energy efficiency, extensive studies have focused on the cutting parameters optimization in the machining process. Actually, non-cutting activities (NCA) occur frequently during machining and this is a promising way to save energy through optimizing NCA without changing the cutting parameters. However, it is difficult for the existing methods to accurately determine and reduce the energy wastes (EW) in NCA. To fill this gap, a novel Therblig-embedded Value Stream Mapping (TVSM) method is proposed to improve the energy transparency and clearly show and reduce the EW in NCA. The Future-State-Map (FSM) of TVSM can be built by minimizing non-cutting activities and Therbligs. By implementing the FSM, time and energy efficiencies can be improved without decreasing the machining quality, which is consistent with the goal of lean energy machining. The method is validated by a machining case study, the results show that the total energy is reduced by 7.65%, and the time efficiency of the value-added activities is improved by 8.12% , and the energy efficiency of value-added activities and Therbligs are raised by 4.95% and 1.58%, respectively. This approach can be applied to reduce the EW of NCA, to support designers to design high energy efficiency machining processes during process planning.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Liu, Dr Ying
Authors: Jia, S., Yuan, Q., Lv, J., Liu, Y., Ren, D., and Zhang, Z.
College/School:College of Science and Engineering > School of Engineering > Systems Power and Energy
Journal Name:Energy
Publisher:Elsevier
ISSN:0360-5442
Published Online:24 July 2017
Copyright Holders:Copyright © 2017 Elsevier Ltd.
First Published:First published in Energy 138: 1081-1098
Publisher Policy:Reproduced in accordance with the publisher copyright policy

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