本文主要在探討不同銑削條件與刀具幾何對比切削係數之影響。比切削係數的求法是以實驗所得的時域銑削力訊號，透過最小平方法辨識比切削係數，此法相較於平均力或諧合力的辨識方法，誤差較小。本文利用此法辨識方法比較不同材料(Al 6061-T651、SUS 304和Inconel 718)、不同切削方式(順、逆銑)、不同切削條件(轉速、切深)以及不同刀具幾何(斜角、隙角、螺旋角)之比切削係數的差異，並觀測其變化趨勢。在Al 6061-T651順逆銑的比切削係數實驗中，發現若平均切屑厚度相同，則順逆銑比切削係數差異是很小可以忽略的。另外以不同幾何之刀具銑削SUS 304，實驗發現螺旋角越大其比切削係數越小；而刀口斜角越大的銑刀比切削係數越小，且負斜角的銑刀切削力比正斜角大；而隙角對比切削係數影響很小。而在不同切削速度的比切削係數辨識實驗中發現，銑削Al 6061與SUS 304的過程中，比切削係數隨切削速度上升有下降的趨勢，但Inconel 718的比切削係數反而隨切削速度上升而增加。

This thesis investigates the effect of milling conditions and tool geometry on cutting coefficients. The cutting coefficients are identified by using the Least Square method with the milling force in time domain. The Least Square method has smaller errors than mean force method and harmonic force method to identify the cutting coefficients. The experiment investigates cutting coefficients by choosing different materials (Al 6061-T6, SUS 304 and Inconel 718), milling configuration (up milling, down milling), conditions (different radial of depth), and tool Geometry (rake angle, clearance angle, helix angle). The results of experiments on Al6061 show that the diversity of down milling and up milling can be ignored for the same mean chip thickness. In milling SUS 304 by different tool factors, the results show that a large helix angle, results is smaller specific coefficients; the bigger rake angle, the smaller specific coefficients. The clearance angle has less effect on specific coefficient. In different cutting speed experiments, on using Al 6061 and SUS 304, the results of experiment show specific coefficients decrease with increase cutting speed, on the contrast, the specific coefficients of Inconel 718 increase with cutting speed.

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