多軸工具機被應用於許多高精度之產品加工，如醫療器材、航太零件等，其中許多的加工產品為結構剛性較低的薄工件。以往針對薄工件之多軸加工大多以避免因加工造成其彈性變形為原則，於製程設計階段進行重複加工測試與量測求得最佳之進給量。若能建立一套薄工件加工之誤差分析與補償流程，即可省去繁複的加工規劃過程，提升薄工件之製程效率。
本研究首先以切削力模擬程式計算薄工件於加工過程中所受到之切削力，接著利用有限元素軟體做靜態分析得到變形量，透過MATLAB擬合計算出誤差矩陣，並藉由誤差矩陣修正薄工件之加工路徑，最後透過形狀創成函數將修正之加工路徑做後處理得到補償後之NC碼；系統評估方面，本文將修正後之刀具路徑藉由VERICUT®做切削模擬，並利用有限元素軟體對虛擬加工後之薄工件做卸載分析以得到加工後之體積誤差，使用者可透過系統評估介面得知加工後工件精度是否符合需求，並將評估結果作為加工道次規劃之依據。
本論文發展出一套系統流程，分析出薄工件之加工體積誤差並予以補償，此系統可應用於多軸加工的製程設計階段，讓使用者針對薄工件之製程做規劃，不僅大幅提升整體製造流程之效率，對工件之精度皆可明顯改善。

Multi-axis machine tools are used for machining of complex workpieces with high precision, such as medical and aerospace parts, some of which are thin workpieces with low structural rigidity. On account of avoiding elastic deformation of thin workpieces caused by multi-axis machining, most engineers in the past must repeat test and measurement in the process planning stage for the optimal material removal within precision requirement. If an analysis and compensation system for volumetric errors of thin workpieces can be established, it will provide for users with complex process planning to improve the efficiency of processing for thin workpieces.
In this research, a cutting force simulation program is used for calculating the cutting force during machining process of thin workpieces, and then finite element software is applied for analyzing the deformation of thin workpieces under static condition. Taking MATLAB for formula fitting, the error matrix can be calculated, and then the cutting path can be modified. Finally through the form shaping function, the NC code with compensation can be generated by postprocessing. In order to evaluate the compensated results, the modified cutting paths are simulated by Vericut software, and the unloading process of thin workpieces after virtual processing is simulated by the finite element software, thus, the volumetric errors with modified cutting path can be generated. Through the evaluation system, the users can obtain the result to check if the precision of the workpiece meet the requirements or not, and regard the evaluation result as the basis for process planning.
In this thesis, a system has been constructed for analyzing the volumetric errors of thin workpieces and compensate it. It can be applied for the process planning of multi-axis machining with thin workpiece. The system makes great improvements not only on the efficiency of the overall manufacturing process but also on the precision of the product.

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