The Study of Reducing the Cycle Time for a Specific Order in the Wafer Fab

• Main Authors: chenghua Lee, 李振樺
• Other Authors: Shu-Hsing Chung
• Format: Others
• Language: zh-TW
• Published: 2000
• Online Access: http://ndltd.ncl.edu.tw/handle/44298336273485067839

碩士 === 國立交通大學 === 工業工程與管理系 === 88 === The wafer fab usually has cooperating policy with specific customers to get long-term steady orders. These customers thus frequently transfer the costs of inaccurate sales forecasting to their suppliers, "wafer fabs", by changing the due date of a pre-scheduled order. The wafer fab that wants to get benefits from cooperation will sacrifice the orders of small-scale customers or low down overall production performances. Facing the request of changing the due date of a pre-scheduled order, this paper studies how to reduce the cycle time for a specific order so as to satisfy customer. This paper constructs three mechanisms for providing decision-related information. First, master production planning mechanism is designed to schedule the release time and due-date for each released order so as to be the input of performance evaluation. Second, cycle time reduction mechanism is constructed to reduce cycle time of the specific order by decreasing batch size in releasing and in dispatching lots to batch resources. The new cycle time of this specific order will be calculated. Last, the system performance evaluation mechanism is proposed to measure the impact to the whole system induced by reducing cycle time of the special order. The case study shows that cycle time reduction for the specific order is realized with such a design. Also, new cycle time for the specific order and for each product type with different priority level are estimated accurately and quickly. Additionally, system performance indexes include system slackness, delay numbers of orders and maximum lateness are provided to judge whether the specific request of reducing cycle time can be accepted or not. Thus, this proposed design is effective and efficient for solving planning related problem of due date change. 1.1研究背景與動機 1 1.2研究目的 2 1.3研究範圍與限制 2 1.4研究方法與步驟 4 第二章、文獻探討 7 2.1訂單管理 7 2.2生產週期時間影嚮因子 10 2.2.1.批量法則 11 2.2.2.緊急工單的影嚮 12 2.3 績效衡量指標設定 14 2.3.1週期時間與其它績效指標之關係 16 2.3.2週期時間與在製品量之關係 16 2.3.3.週期時間與產出量之關係 17 2.3.3週期時間與利用率之關係 17 第三章 模式構建 20 3.1問題定義分析 20 3.2 整體控制架構與邏輯 21 3.3 多等級工單情況下之主生產排程規劃機制 23 3.3.1生產週期時間估算機制 24 3.3.1.1 負荷因子等候時間之估算--M/M/c等候模式 25 3.3.1.2批量因子等候時間之估算--區段基礎式週期時間估算法 29 3.3.2.目標水準之設定 34 3.3.2.1系統在製品量 34 3.3.2.2投料循環表與投料時程表 35 3.3.2.3產出時點與交期設定 36 3.4 縮短週期時間調控機制 36 3.4.1.批量大小之決定 37 3.4.2. 特定訂單之投料法則 40 3.4.3生產週期時間修正 41 3.4.4資源監控機制 42 3.5 系統績效評估機制 45 3.5.1階段別的判定 45 3.5.2.跨階段生產週期時間之修正[41] 46 3.5.3.製單預訂完成時間之修正 47 3.5.3.1一般等級(normal)製單 48 3.5.3.2次緊急(rush)製單 48 3.5.3.3規劃幅度內緊急(hot)製單 49 第四章 實例驗証 52 4.1 系統環境說明 52 4.2 輸入資訊與模式驗証(模擬環境說明) 53 4.2.1 基本輸入資料 54 4.3多工單等級主生產排程之執行結果與模擬驗證 55 4.3.1生產週期時間之規劃結果與模擬驗證 55 4.4縮短週期時間調控機制之執行過程與模擬驗證 56 4.4.1縮短週期時間調控機制之執行結果 56 4.4.1.1生產週期時間 56 4.4.1.2 資源監控機制 58 4.4.2縮短週期時間調控機制之模擬結果 60 4.4.2.1生產週期時間模擬結果 61 4.4.2.2資源監控機制之模擬結果 63 4.4.3縮短週期時間調控機制之結果分析比較 67 4.4.3.1生產週期時間結果分析 67 4.4.3.2資源利用率結果分析 70 4.5系統績效評估模組 72 第五章、結論與未來研究方向 74 5.1結論 74 5.2未來研究方向 75