積層製造(Additive Manufacturing ，AM)採用離散材料(液體、粉末、絲、片、板、塊等)逐層累加原理製造實體零件的技術。是一種自下而上材料累加的製造技術，也稱為加法製造，有別於傳統加工方法利用設備進行減法的方式，如利用車床加工、研磨等製造出所需的產品，積層製造特色在於達成「設計個人化、浪費極小化」，具備客製化、節能、迅速、彈性及高價性能比等優點，現正逐漸用於一些產品的少量直接製造，特別是一些高價值應用，如生醫零件或航太零件都可以採用這種技術。
雖然加法製造的積層成型技術有很多的優點，但仍然有一些瓶頸需要去克服，製程參數對披覆品質的影響需要進行研究，為了設計出一穩健製程，除了需具備材料方面以及熱傳知識，也必須對相關文獻進行探討，以利在實驗設計中能定義出較適當的品質目標，同時篩選出重要的實驗參數，讓研究流程更有效率且結果更有價值。
明確設定目標與瞭解實驗設備後，列表實驗中可調動參數，排除影響較小實驗因子，並先整理出實驗參數調動適當範圍，將使用田口方法的實驗規劃分析各因子對披覆品質的影響，為增進實驗效率初步先未考慮交互作用，對實驗結果進行分析披覆形成缺陷原因，並進一步變動製程嘗試解決，進行最佳化設置以提高披覆高度與平整度。除了宏觀的表面品質分析外，也將對微結構進行探討，分析製程參數如何對其進行影響，本文針對直接製造矩形薄壁零件進行分析，找出關鍵因子參數對品質的影響，並證實研究前後差異。

AM (Additive manufacturing) is a novel technique to manufacture physical parts layer by layer using discrete materials such as liquid, powder, silk, film, plate, block, etc. Different from the traditional processing methods using equipment to subtract parts, for example, the use of lathe processing, grinding, etc. The purpose of AM is to achieve "personalized design, waste minimization". The process has advantage of customization, energy saving, rapid, flexible and high-performance performance. Currently, medical parts or aerospace parts can use this technology for a small number of direct manufacturing products.

Although the additive manufacturing technology has many advantages, there are still some bottlenecks need to overcome. The influence of process parameters on the quality of cladding needs to be studied. In order to design a robust process, the materials and heat transfer knowledge are essential. The related literature must be searched to define appropriate performance index. Meanwhile picking out important experiment parameters, so that the research process more efficient and the results more valuable.

To simplify the complexity of laser cladding experiment design, we listed total adjustable parameters table, excluding the less impact of experiment factors, and first sorted out the appropriate setting range of parameters. The relationships between parameters and performance indices of cladding would be analyzed by using Taguchi methods. It was possible to find the significant of cladding with limited numbers of experiments by applying orthogonal arrays. In this paper, the direct manufacture of rectangular thin-walled parts were analyzed to find out the key factor parameters on the surface evenness and cladding height of the impact and confirmed the difference before and after.

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