Abstract
For some production industries, in order to accommodate diversified customer needs and shortened product lifecycles, job-order production and quick delivery are required. In production schedules that determine the amount of production, there is trade-off relationship between the meeting due date and productive efficiency. However, the relationship changes according to daily changes in the work in process in the case of high-mix production companies. This study thus proposed a method to: 1) extract four parameters which affect the balance of both factors, 2) change the parameters and make a production schedule, 3) put the due date and productive efficiency into indices, 4) assess the balance based on a simulation with the parameters and 5) use a graph which shows the results of the production schedule. The four parameters are: 1) the number of days for producing at a given time, 2) how to deal with the same parts for the following ten days, 3) how to deal with unfinished parts in the preceding process and 4) the method of producing at a given time. In addition, the effectiveness of the proposed method is verified using the data of a target company. The results show that the rate of the meeting due date can increase by 23.8% when the rate of productive efficiency decreases by only 1.0%.
