強力刮齒刀(Power Skiving)是一種有極高效率的加工齒輪技術，常被用於進行內齒輪及外齒輪之加工，然而強力刮齒刀卻較少被使用於切削螺桿上，雖然其幾何與齒輪相似，並已有研究指出以強力刮齒切削螺桿具有可行性，然而切削時之切屑及切削力需有進一步的研究進行可行性的佐證。本研究著重於探討新型內旋強力刮齒刀在切削螺桿時之未變形切屑幾何及體積移除率，先以目標螺桿之齒條創生對應之強力刮齒刀，並建立以強力刮齒刀切削螺桿之相對座標系及數學模型，更進一步將加工過程分為單次及兩次徑向切削，將強力刮齒刀刀具面之切削路徑藉由等截面法轉成螺桿齒廓面之切削軌跡，並以此建立未變形切屑數學模型，將取得之切屑點進行四面體網格化，以此計算未變形切屑之體積，藉由探討各加工參數下之未變形切屑體積及其體積移除率(Material Removal Rate, MRR)，獲得最佳切削效率之加工參數，而其中的未變形切屑體積將藉由SOLIDWORKS 3D設計軟體對其進行驗證。此外，本研究亦有利用上述未變形切屑之體積移除率，透過Kienzle方程並帶入實驗因子，建立切削力預測模型。結果證明在相同刀具及工件材質的前提下，本研究之預測切削力數值均小於現有文獻中實驗量測之切削力數值，進而證明此新型內旋強力刮齒技術具有較高的可行性。;Power Skiving is an extremely efficient technique for machining gears and is often used for internal and external gear machining. However, power skiving is rarely used for screw rotors, which similar to gears. A study has shown that it is feasible to cut screw rotors with power skiving, however, further research is needed to prove that the cutting chips and cutting forces are feasible. This study emphasis on investigating the geometry and volume removal rate of the undeformed chips of a new internal-cylindrical skiving cutter when cutting a screw. First of all, generate an internal-cylindrical skiving cutter corresponding to the rack of the target screw. Then, establish the coordinate system and mathematical model for cutting screw with the internal-cylindrical skiving cutter. The machining process was further divided into single and two radial cutting. In order to establish the mathematical model of the undeformed chip, the cutting path of the skiving cutter face is converted into the cutting trajectory of the screw tooth profile by the isotropic method. By exploring the volume and the volume removal rate of undeformed chips under each machining parameter, the machining parameter with the best efficiency is obtained. The volume of the undeformed chips will be verified by SOLIDWORKS 3D design software. In addition, a cutting force prediction model was developed by using the above volume removal rate of undeformed chips through Kienzle′s equation with experimental factors. The results proved that the predicted cutting forces in this study were smaller than those measured by experiments in the rest of the literature for the same tool and workpiece materials. This further proves that the high feasibility of this new internal-cylindrical skiving technology.
