本文提出一個以銑削力模式為基礎的方法來評估兩種不同之微量潤滑方式對刀腹磨耗以及銑削穩定性之影響。本文利用DGCC的銑削力模式建立切向犁切削係數與刀腹磨耗之關係，因此可以在不用卸下刀具情況下而直接在線上量測刀具的磨耗情形，且根據無因次化切向犁切削係數結果可以說明兩種微量潤滑之效益，由實驗結果發現比磨耗能以乾切削最大，其次是傳統MQL而超音波二流體最小，比磨耗能越大表示切向犁切削係數隨磨耗成長越快。根據同一個銑削力模式也可以推導出銑削過程中的極限穩定方程式，利用此一極限穩定方程式所得出的臨界穩定切深可作為評估銑削穩定性的指標，由實驗結果發現在潤滑添加下銑削SKD61模具鋼之臨界切深有明顯之提升，其中微量潤滑之方式最能有效提升臨界切深，相較於乾切削可增加臨界切深約40%其次為一般濕切削可增加臨界切深約30%，從模式中可以推測出製程阻尼之提升為提升臨界切深之主要原因。

This study presented a cutting force model based to approach the influence of two different kinds of Minimal Quantity Lubrication methods on flank wear and stability. We utilized the DGCC milling force model to construct the relationship between tangential cutting coefficient for the plowing and flank wear. Therefore, we could measure the value of flank wear on line without disassembling the tool. And according to the results of dimensionless the tangential cutting coefficient for the plowing, we could explain the efficiency of two kinds of MQL. The experimental results revealed that the specific abrasion energy in dry cutting was the largest, the conventional MQL was next, and two-fluid ultrasonic lubrication was the smallest one. Specific abrasion energy grew with the tangential cutting coefficient for the plowing, the larger tangential cutting coefficient for the plowing was, and the faster Specific abrasion energy grew. According to the same milling force model we could derivative the limit stability equation, and utilized critical depth of cut which was found by the limit stability equation to be the indicator of milling stability estimate. From the experiment results we could found that the critical depth of cut of milling SKD61 with MQL was the most effective way to increase critical depth of cut, and it could increase critical depth of cut by 40% or so as compared with dry cutting. General wet cutting secondly increased critical depth of cut by about by 30% or so. We could conjecture that the increase of process damping was the main reason for the increase of critical depth of cut.

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