案例公司為全球性半導體元件製造商,並在北台灣有一封裝測試事業單位,製程中以壓模製程為瓶頸站。案例公司在派工法則運用上以先進先出為基礎,而在壓模站以累積的生產週期時間(Cycle Time)最高者優先,以對生產週期進行掌控,案例公司在生產週期時間相關績效指標中,特別重視生產週期時間95%tail,故本研究嘗試將目前文獻中廣泛運用的派工法則,以及近年發展出的派工法則中,以模擬的方式找出最適合半導體封裝產業的派工法則,並比較各派工法則與案例公司現行派工法則(ACT)之各項績效表現以尋求改進空間。針對生產週期時間以波動平穩策略進行測試,同時參考彈性流程型工廠之派工法則發展WTNQ派工法則。實驗結果顯示WTNQ派工法則在生產週期時間上具改善效果,ACT派工法則與波動平穩策略中的FSVCT法則,可有效降低生產週期時間變異。案例公司運用ACT法則以降低生產週期時間與生產週期時間95%tail,根據實驗結果顯示ACT法則在生產週期時間95%tail中表現優於其他派工法則。
The semiconductor assembly factory in Taiwan is a global manufacturer of IC, the bottleneck in process is mold station. To control the cycle time performance, the dispatching rule is based on FIFO, while in the mold station the highest priority gives to job with the highest accumulate cycle time (ACT). Among the cycle time related performance indicators, the company pays much attention to cycle time 95% tail. A simulation model is built to test the dispatching rules, which are commonly used in researches and developing recently. To aim at cycle time reduction and the flexible flow shop production type, the fluctuation smoothing policy and WTNQ series dispatching rule is being tested. The result shows that the WTNQ rules perform well in cycle time reduction, while the ACT rule and FSVCT rule perform well in cycle time variance reduction. The ACT rule is also better than other dispatching rule in cycle time 95%tail performance.