Scheduling in two-machine robotic cells assuming tool switching time and dependency of the processing time ‎

Document Type: Research Paper

Authors

1 Department of Industrial Engineering, Islamic Azad University, Bonab Branch, Bonab,Iran

2 Department of Industrial Engineering, University of Kurdistan

Abstract

A set of different parts are produced by robotic cells as cyclic and each part requires a ‎number of tools on each machine in order to be completed; if the tools required for the part are not ‎available in tool magazine of the machines, the part process will be completed by switching tools; ‎which would be time-consuming. As the tool magazines of machines have limited capacity, the ‎method of tools switching is a decision making problem. Furthermore; the arrival sequencing of ‎different parts to the cell affects the frequency and number of tools switching. In addition, it has ‎been assumed the processing time of each part on the second machine depends on the quality of ‎the part process on the first machine, and as the quality of parts process depends on the tools life of ‎the first machine, subsequently, the processing time of the second machine acts as a function of ‎tools life on the first machine. Based on this procedure, the cycle time in the possible movement ‎policies of the two-machine robotic cells has been calculated, followed by presenting the ‎mathematical programming model for minimizing the cycle time in that cell. Then, the effects of ‎the time spent for switching the tools as well as the dependence of processing time have been ‎analyzed as the two new assumptions on the cycle time, and the mathematical programming model ‎is solved by using GAMS and genetic algorithm.‎

Keywords

Main Subjects


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