汽車及零組件製造業產為台灣極度重要的產業，而面臨環境競爭與國際化的壓力，企業朝向低成本、高品質、高彈性與交期短等目標持續改善，許多企業傾向導入精實生產來降低生產成本與增加製造彈性以提升產業競爭力。本研究以汽車引擎連桿廠為實例，將單元工程的概念應用於生產線設計，產生出合適且實務可行的改善方案，並設計最佳化方案，管理者可將其作為生產線未來發展的目標。
首先以價值流圖分析案例公司現況方案，找出改善契機，接下來利用作業研究表蒐集要素作業時間，假設案例公司導入多能工的條件下，依精實作業安排指派作業給作業員，再由標準作業組合表求出作業員週期時間，提出改善方案，並假設案例公司導入著著化後，按照與上述相同的步驟求得最佳化方案，並在顧客需求變動的情況下討論各方案少人化人員配置情況，之後利用模擬工具蒐集定量績效指標，最後以敏感度分析討論在顧客需求不同的情況下，改善方案與最佳化方案導入少人化前後績效指標的變動情況。
經過結果分析與比較，案例公司目前正在實行的改善方案較現況而言，週期時間改善百分比為37.67%，在製品數量改善百分比為32.17%；而最佳化方案較現況之週期時間改善百分比為56.65%，在製品數量改善百分比為51.74%，可看出案例公司生產線導入單元工程設計能減少週期時間、在製品數量並改善工件移動總距離、設備佈置使用總面積，且提高人員利用程度，並驗證少人化效益，使生產線作業員人數配置更有彈性，將來案例公司可望持續朝本研究提供的最佳化方案為目標發展。

Motor vehicle part manufacturing have been important industry in Taiwan over 30 years. However, in the case of more competitive market and internationalization, many enterprises have been adapting lean method not only to reduce costs and wastes but also enhance product quality and flexibility of productions. This study is conducted to the case firm, a connecting rod manufacturing, and try to impel cellular manufacturing in design of engine connecting rod’s production line and propose the improvement plan and the future plan which can be referred by case firm.
First, we use value stream mapping to distinguish wastes in the system and find out the chances of improvement. And we collect elementary operating time by processing study sheet. Second, we rearrange job allocation of operators with lean method and use standardized work combination sheet to calculate the operator’s cycle time. Next, we propose the improvement plan. Moreover, assumptions that the case firm can impel concept of Chaku-Chaku way in connecting rod production line, we follow the same steps to get the future plan. Therefore, we also discuss the configuration of labor linearity about the improvement and future plan. Afterwards, discrete-event simulation can be used to find the system performance index of plans. Finally, we conduct a sensibility analysis to discuss the different plan’s system performance under the circumstances of customer’s variable demand.
As a results, purposed plans can reduce cycle time, WIP level, number of operators, total usage area and total distance but also improved utilization of operations and flexibility of operator’s allocation. It also justifies the benefit of the labor linearity. Now, case firm have already impelled the improvement plan and it have brought advantages to them obviously.

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