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    Please use this identifier to cite or link to this item: http://ccur.lib.ccu.edu.tw/handle/A095B0000Q/132


    Title: 強力刮齒製程之電腦數值模擬;Computer Numerical Simulation of Power Skiving Processing
    Authors: 古尚倫;KU, SHANG-LUN
    Contributors: 機械工程系研究所
    Keywords: 強力刮齒;強力刮齒刀設計;切痕嚙合方程式;切痕分析;接觸點數分析;接觸線;Power Skiving method;Cutter Design;Even-Contact condition;cutting mark minimization
    Date: 2018
    Issue Date: 2019-05-23 12:52:39 (UTC+8)
    Publisher: 機械工程系研究所
    Abstract: 強力刮齒為目前最熱門的圓柱形齒輪製造方法,相較於刨齒和滾齒,其具有高效率和高精度等優勢。近年強力刮齒備受業界及學術界重視,但目前國內齒輪製造商尚未掌握此關鍵技術。 本研究著墨於強力刮齒刀具的設計參數與加工參數,探討其對於切削痕跡與接觸點受力的影響。文內使用的強力刮齒刀具齒形是由最小平方法獲得,再由三維座標轉換矩陣模擬其切削運動。在具有雙自由度進給的齒輪加工系統上,使用雙嚙合方程式,具有兩個進給量:刀具轉角與刀具軸向位移。因需取得切削痕跡,本研究僅使用一條嚙合方程式,將刀具軸向位移(Axial Feed)轉換為相對於刀具轉角(Spindle Rotation Angle)的函數。 觀察強力刮齒刀做動建立切削行為,模擬齒面上的切痕分布。分析得應變變因,可從中得到在某刀具設計參數、加工裝配參數下可獲得較高的精度或效率。同時,亦觀察切削某瞬間轉角下嚙合時之接觸點數,偶數表兩側切削力相等;奇數表兩側為不均勻切削力。為獲得較佳的受力,提出了修改刀具設計參數。 期望最佳化上述參數,透過優化的參數,依使用者的需求給予建議。本論文的結果可用於模擬強力刮齒加工齒輪齒面上的切削痕跡與接觸點數受力狀況。
    The Power-Skiving? method is widely used to generate the stacked cylindrical involute gear for its low cutting tool clearance between adjacent stack gears. In this study, we explored the influence of cutter geometry and machine setups on the cutting marks on the generated tooth surface and the even-contact condition between cutter and tooth surface. The cutting edge profile of Power-Skiving cutter is derived from work gear geometry by using the conjugate theory and represented as a polynomial function by the Least Squares Fitting Method. The cutting marks on the generated tooth surface is formed by summarizing all the cutting edge locus in the coordinate system of the generated tooth surface during the Power-Skiving cutting motion with specified machine setups. The height of cutting marks can be reduced by changing the feed rate of cutter in the workpiece axial direction. We observed the number of contact points between the cutting edge of cutter and the generated tooth surface in the drive and coast sides with respect to the cutter rotation angle and found that the contact point number is varied with respect to the cutter rotation angle and the number of simultaneous contact points in the drive and coast sides is not always the same. The unbalanced contact point number in the drive and coast sides will induce the unbalanced cutting forces in the forward and reversed sides of the cutting spindle, which will lead to tooth profile error in the generated tooth surface. Therefore, the even-contact condition between cutter and workpiece can be guaranteed by specified the cutter geometry and machine setups in the Power-Skiving process. The results of this thesis can be used to minimize the height of the cutting marks with specified axial feed rate of cutter spindle and the even-contact condition between cutter and workpiece can be guaranteed with specified cutter geometry and machine setups of Power Skiving process.
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