Integration of Multi-stage Manufacturing Shops with Queue-time Constraint
Date Issued
2010
Date
2010
Author(s)
Huang, Cheng-Hao
Abstract
The semiconductor manufacturing system is complex, each of manufacturing node do the best production planning, but lack of cross cooperation between the factory. There are many factors affecting the throughput and yield rate. One of them is the “Queue-Time-Limit”. Certain process steps have the queue-time-limit, which means a lot needs to begin the following process step within certain time limit after it completes its operation of the previous process step. If a lot exceeds the queue-time-limit, quality issues will occur and the lot needs to be reworked
Many of the references deal with multi job shops integration issues, they use mathematical programming method or the simulation method to obtain the optimal solution, but when the complexity of the problem become larger, decision time will grow exponentially. This situation is not suitable for short-term,dynamic environment. So, this research develop a static capacity estimated based integration method (Queue estimate-based Lot Permission rule; QEBP) it using the available information currently, such as the lot type, site of conditions or so on to Combination calculation, in order to estimate the production cycle time quickly.
This information can be used to handle work orders with the queue time limit characteristics upstream production node estimate the downstream buffer loading, and then feed the lots at appropriate time to avoid waiting time exceed the limit .After the simulation analysis, we found QEBP complete more work orders than all-release method in different environment ,it’s also estimate the capacity loading efficiently that can help managers make decisions quickly.
Subjects
semiconductor manufacturing
integration of scheduling
static capacity
Queue-time limit
look-ahead information
Type
thesis
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