Application of factor rating for production layout selection to improve production: Case study rail joint production
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Abstract
The objective of this research was to improve the rail joint production by developing the production layout and selecting the suitable production layout. The study was done by analyzing the value stream mapping current state together with flow diagram and outline process chart in order to study the problem condition and analyze the problem with why-why analysis technique. Four rail joint production layouts were designed on purpose to make a decision and also factors influencing on selection of those layouts were included. In this study, the determination of proper factors, concerned with Index of Item-Objective Congruence (IOC) with value above 0.5, was obtained from experts. Then, a method of pairwise comparison was employed to construct weight of those factors. Consistency ratio was also tested with satisfied score of 0.09, lower than 0.10. The primary outcomes showed that factors with their weights having an effect on layout selection were as follows: capability of management and production control, change of production volume, cost of improvement, period of improvement and distance with weights of 0.36, 0.34, 0.13 and 0.05, respectively. As a consequence, according to scores of four production layouts in relation to those five factors, the highest scores of 3.31 belonged to the third layout. This layout led to decrease 40 m of distance, 50,000 baht of improvement cost, and increase 6-10% of production volume with high management capability and production control compared to the original layout.
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