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標題: | 以獲利為基礎的晶圓製造系統改善工單交期之區段式派工法則研究 To enhance the performance of a profit-based dispatching rule to meet the delivery date by a block checkpoint method in a semiconductor manufacturing system |
作者: | Ssu-Hsien Li 李思賢 |
指導教授: | 謝淑華 |
關鍵字: | 晶圓製造,週期時間,派工法則,交期,區段式, wafer fab,cycle time,dispatching,due date,block, |
出版年 : | 2005 |
學位: | 碩士 |
摘要: | 由於晶圓製造廠其製程複雜性與機器設備多樣性等因素的交互影響,顧難以精確掌握晶圓製造週期時間的變化,因此廠家在接受訂單時訂單交期日的決定往往只能粗略的估計,難免產生交期的延誤而招致罰金與商譽的損失。Chung and Huang[19]有鑑於此,提出區段生產週期時間的預估方法學,致力於工單的排序與交期的密切的配合。另外,侯氏[7]提出以獲利為基礎的派工法則,量化每個工單獲利能力的差別,使高價值工單優先產出,卻忽略低獲利工單在交期上的問題。
本研究主要目的,首先將針對侯氏[7]所提出以獲利為基礎的晶圓製造系統中,以模擬實驗在多工單不同獲利強度的情況下,是否會發生嚴重交期延遲現象。其次,藉由加入Chung and Huang[19]之區段生產週期時間的預估方法學,將製程以批量機台作為區分點,以區段作為檢驗控制的時間點,判斷每個工單在該區段是否會有加工進度落後的情形發生,並給予延遲之懲罰成本,進而調整各工單之派工優先順序,以改善低獲利工單發生交期嚴重延遲的現象。最後,再進行修正後之模擬實驗,經由實例驗證結果顯示,不論是在平均加工週期、平均延遲數目、平均延遲率、平均延遲時數,皆有大幅度之改善。 The factor interactive effects such as reentry phenomenon, process complexity and variety of workstations of a semiconductor manufacturing system make the estimation of the production cycle time difficult. This affect the calculation of a job due date inaccurately. Therefore, penalty due to order delay occurs frequently, and the company brand name is also affected. Chung and Huang[19] thus developed an algorithm for the production cycle time estimation to enhance the calculation of a job due date. A profit-based dispatching rule proposed by Hou[7] assures the job dispatching lead the maximal production profit. However, some low profitability jobs could be delayed, miss the delivery date and cause penalty, and thus lose company’s name. Can a profit-based job dispatching rule consider the loss from the order delay? This has not be discussed in the past research. The main purpose of this study is to enhance the profit-based dispatching rule to meet the due date. Firstly, a wafer fabrication simulation model is built to identify that the order delay causes a serious problem if the job profitability is low. Secondly, adopting Chung and Huang’s[19] cycle time estimation, the block checkpoint is added to the profit-based job dispatching rule between batch processes to identify possible job delays. If there is any, penalty occurs, and the profitability of each job is changed. Therefore, job order priorities are changed, and low profitability job can be processed in time. Finally, to demonstrate the proposed method, a simulation case study is performed and shows that the block check point does reduce the job order delays that might occur if a pure profit-based dispatching rule is adopted. |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/35822 |
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顯示於系所單位: | 機械工程學系 |
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