本文提出一個以捲積銑削力模式為基礎的方法來探討徑向切深對銑削穩定性之影響，並利用銑削顫震時之顫振軌跡解析式找出最大顫震振動方向，以此為基礎來探討在非對稱結構下，不同進給方向對銑削穩定性之影響為何。其結果發現最佳進給方向主要與徑向切深、徑向比切削係數和結構最大剛性方向有關。而在銑削穩定預測方面，本文提出使用近似多項式的方式，建立一套快速畫出徑向切深穩定耳垂圖之流程，並經由過去文獻與實驗驗證後，證明其近似後之穩定耳垂圖有一定之準確性。此外，根據同一個銑削力模式也可以推導出銑削過程中的銑削諧和力解析式，並找出各個銑削頻率下的銑削諧和力之力量軌跡，利用此力量軌跡可獲得在銑削時的最大銑削力量方向，以此為基礎可獲得最小銑削強迫振動下的最佳進給方向。最後利用機械手臂作銑削振動實驗，驗證在非對稱銑削結構下，不同的進給方向對銑削振動位移大小之影響。

This paper presents a method that based on the average milling force model to investigate the effect of radial depth of cut for milling stability. We Utilized the analytical formula of chatter trajectory to find the maximum vibration direction. As a basis for exploring the influence of milling stability in different feed directions at the asymmetric structure. From the analysis results we could found that the best feed direction depends on the radial depth of cut, radial cutting coefficient and maximum rigidity direction. And this study proposes the use of approximate polynomial to establish stability lobe diagram for the radial depth of cut. According to the same milling force model we could derivative the harmonic force analytical formula. And find the trace of milling harmonic forces under each milling frequency, use the force to obtain the direction of the maximum milling force, and then base on the method mentioned above, to find the best feed direction with the maximum forced vibration. Finally, using the manipulator go through the milling vibration experiment , to verify the effect on the magnitude of milling vibration displacement contributed by different feed directions under the situation with asymmetric structure.

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