Infinite capacity planning for IC packaging plants

Abstract

An infinite capacity planning system (ICPS) considering the capacity and capability of machines as well as the capacity of jigs is developed for an integrated circuit packaging plant. ICPS consists of five modules: work-in-process (WIP) pulling module, lot release module, resource selection module, workload accumulation module, and workload balance module. The WIP-pulling module pulls WIP from the end of the process route to meet the master production schedule (MPS). If WIP cannot meet the MPS requirement, the lot release module is executed to release new lots. The resource selection module helps a lot to select an appropriate resource, by taking into account the resource's capacity and capability, at each operation step and calculate the lot's planned start time and planned finished time at each step. The workload accumulation module accumulates the workload of each machine and each jig on each day. The workload balance module balances the loading of machines and jigs by adjusting the lot's start time using these resources. Simulation is used to evaluate ICPS performance, and results show that ICPS can effectively and efficiently balance the workload of production resources: machines and jigs.

Keywords:

• IC packaging
• capacity planning
• capability

Acknowledgements

The research was supported by National Science Council of Taiwan, ROC (contract nos NSC 93-2212-E-033-003 and NSC 97-2221-E-033-027) and United Test Center.