切削加工中選用的切削參數往往會影響到產品生產率以及加工的成本，要得到最佳的加工成本是一件值得探討與研究的事情。故本研究的目的主要考量切削動力、刀具磨耗以及切削成本，並求得各個切削參數的單位成本。本研究首先藉由刀具磨耗實驗建立泰勒刀具壽命方程式，並得到當刀具壽命終止時所需要的時間。再藉由使用MetalMax軟體得出切削顫振穩定圖以及建立切削成本與移除體積的數學模型，然後將泰勒刀具壽命方程式與其結合，目標是可以在單位成本分析圖上加上機台與刀具的限制與切削顫振穩定圖的應用，以避免不穩定的切削產生，由此我們可以得知選用哪些參數可以符合加工的需求又避免顫振的產生。由刀具磨耗實驗結果中可以發現切削參數中的主軸轉速影響刀具壽命最為嚴重，再者是進給，影響最小的是切削深度。而在單位成本分析結果來看則會發現位於穩定區時，當切削深度越大時其單位成本會越小，而每轉進給與切削深度具有相同的趨勢，最小單位成本位於切削顫振穩定圖中的中轉速區域，雖然較高的轉速會造成其單位成本的降低，但是由於切削顫振穩定圖的限制使得可選用切削參數範圍縮小，因此在參數選擇上受限。

Selection of cutting parameters affects productivity and machining cost in machining process. Obtaining the optimum machining cost is an important thing which is worthy of being discussed and studied. Therefore, machining dynamics, tool wear and self-excited vibration are considered for analysing the optimum unit cost of parameter combination in this study. First of all, Taylor’s equation of milling Al 6061-T6 using HSS-CO end mill was built up. Second, stability lobe diagram was obtained using MetalMax. Third, mathematical models of machining costs and material removal volume were developed. Finally, a figure of machining cost was drawn based on the tool wear, machining stability and cost model.
From the results, the minimum cost of parameter combination was obtained. We can find that the increase of depth of cut, spindle speed and feed per revolution can reduce the unit cutting cost. However the stability lobe diagram limit the choice of cutting parameters. The optimal combinations of cutting parameters has to be decided based on the stable cutting range.

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