Production Schedule Planning for a Wafer Fabrication under a Non-steady State Environment

• Main Authors: Hsin-e Lee, 李幸娥
• Other Authors: Shu-Hsing Chung
• Format: Others
• Language: zh-TW
• Published: 2002
• Online Access: http://ndltd.ncl.edu.tw/handle/78305943253760810683

碩士 === 國立交通大學 === 工業工程與管理系 === 90 === As more competitors entered the market, the competition of semiconductor industry has changed from producer-oriented manufacturing into customer-oriented service. When every company aims to improve the flexibility of production system in order to compete for customer orders, a production planning based on the assumption of a stable environment is no longer applicable. A new production planning and scheduling system needs to consider demand uncertainty under a non-steady state environment, minimize production variance, and maintain good production performance and scheduling stability. The system is a necessity to improve the competitiveness in wafer fabrication. In order to achieve the above target, this research will construct a production scheduling planning for wafer fabrication under a non-steady state, make-to-order production environment. This research contains three modules. To prevent bottleneck shifting and the increase in production cycle time, the target planning module estimates the maximum quantity that can be produced in each product family. A composition for product mix ratio is then obtained to make sure that each product under the product mix has a competitive production cycle time. When a new order comes in, the demand management module will evaluate the acceptability of the order based on due date schedule and the effect on due date of existing orders. Finally, the master production schedule module evaluates the capacity loading after new order acceptance, and plans the release sequence, release time schedule, throughput schedule, and due date assignment of each order. The modules proposed in this research will provide a feasible reference for planners to be market competitive, to satisfy customer demand and to maintain good production performance.