Applying fuzzy logic in selecting press machine for scheduling n-jobs on a single machine

This paper deals with scheduling n-jobs on a single machine. The problem is to determine which machine will be used based on the job characteristics. Since each job has different characteristic according to the customer requirement, the floor shop facing difficulties in selecting the press machine as per requirement. Two steps solution are proposed, first step using fuzzy logic to determine which machine to be used, and the second step to make scheduling n-jobs on selected single press machine following the priority rules EDD (earliest due-date) or SPT (shortest processing time). The fuzzy variables to be considered are speed and pressing capacity of the press machine, while for the non-fuzzy variables are slide, bolster and dies height. The computational experiment is based on 91 jobs with 8 unit press machines supported by software Borland Delphi.