Machine Tool Reliability: Lad/Machine
04 Mar 2016-
About: The article was published on 2016-03-04. It has received 3 citations till now. The article focuses on the topics: Reliability (statistics) & Machine tool.
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TL;DR: It is observed that integrated PM and LOR approach gives better Life Cycle Cost performance compared to isolated approaches and the importance of user’s cost structure and shop floor operations policy parameters in LOR and PM planning is evident from the results.
Abstract: In this paper, a novel approach is developed for machine tool maintenance modelling considering fleet system architecture. The fleet system architecture consisting of different types of machine tools from various OEMs operated at different users, but supported by a single repair depot is considered. The prime objective of this paper is to jointly optimize the decisions of Level of Repair (LOR) i.e. repair/move/discard, and Preventive Maintenance (PM) schedules considering user’s cost structure and shop floor policy parameters. It is observed that integrated PM and LOR approach gives better Life Cycle Cost (LCC) performance compared to isolated approaches. Also, the importance of user’s cost structure and shop floor operations policy parameters in LOR and PM planning is evident from the results. The proposed approach is very useful for the machine tool manufacturers (i.e. OEM) who want to engage into long term maintenance contract with their customers. Integrating LOR and PM is a complex problem. The complexity further increases due to consideration of time dependent failure rate of the machine components, imperfect maintenance which brings partial restoration to the components/systems, and stochastic natures of model parameters. Consequently, a simulation based genetic algorithm approach is used to solve the problem.
7 citations
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01 Aug 2019
TL;DR: A novel Reliability Associated Cost (RAC) model for machine tools throughout its lifetime that considers two different failure consequences, immediate failure and product rejections increase failure is proposed.
Abstract: This paper proposes a novel Reliability Associated Cost (RAC) model for machine tools throughout its lifetime that considers two different failure consequences, immediate failure and product rejections increase failure. A maintenance strategy of corrective maintenance combined with overhaul utilized to the maintenance activities of machine tools in the current paper. Markov reward approach is developed for computing of the costs incurred by both failure consequences and maintenance activities and system average availability throughout the machine tools life cycle. The Genetic Algorithm is used to find the optimal repair rates layout and overhaul moments that provide a minimal expected cost of system operation and maintenance actions and satisfies the desired availability requirement. A numerical example is presented in order to illustrate the approach and the results show that the proposed technique can significantly cut the RAC for machine tools.
5 citations
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TL;DR: In this article, the authors discuss various aspects of performability for next-generation manufacturing systems and identify intelligence as an essential dimension of performance for such systems, and present new business models that utilize the performability of the next generation manufacturing systems.
Abstract: Globally, the manufacturing industry is gearing up for the next level of industrial revolution, and it is called smart manufacturing or Industry 4.0. This chapter aims to discuss various aspects of performability for next-generation manufacturing systems. “Intelligence” is identified as an essential dimension of performability for such systems. Various elements of this new dimension are discussed, and the associated technologies are mapped. New business models that utilize the performability of the next-generation manufacturing systems are presented. Finally, a new philosophy, namely, “Manufacturing by Mass,” is built to capitalize the full potential of intelligent factories.
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