直銑刀外周斜刃角對硬槭端面溝槽銑削性能之影響

Effects of Helix Angle of Straight Router-bit on Performance of Inside End-Grain Milling of Hard Maple in CNC Router

蘇文清(Wen-Ching Su) ； 王怡仁(Yi-Ren Wang)

《林產工業》 23卷2期 (2004/06) Pp. 111-119

https://doi.org/10.6561/FPI.2004.23(2).3

摘要

本研究以直徑12mm直銑刀對硬槭進行溝槽銑削，銑削深度6mm，主軸轉速12000rpm，試驗中改變直銑刀之外周斜刃角，並分別以600mm/min、1200mm/min、2400mm/min及4800mm/min四種送材速度進行銑削，以探討不同外周斜刃角及送材速度對硬槭端面直銑削品質之影響。試驗結果顯示所有試片之切削端面皆有產生起毛現象，且上向切削之刀具離開端及下向切削之刀具切入端會產生輕微劈裂現象，劈裂程度隨送材速度之增加而增加。切削抵抗以外周斜刃角2°較低，且隨著外周斜刃角增加而增加切削抵抗；各種外周斜刃角之垂直切削抵抗隨送材連度增加而明顯增加，然水平切削抵抗並無明顯趨勢，至於電能消耗則以外周斜刃角2°或4°消耗電能較低，隨著送材遠度增加，電能消耗直線下降，惟其加工面變的較為粗糙。

關鍵字

直銑刀 ； 外周斜刃角 ； 送材速度 ； 銑削 ； 切削抵抗

並列摘要

Effects of helix angles and feed speeds on inside end-grain milling of hard maple using a straight router-bit (12mm dia.) which mounted on a CNC router were explored in this study. The helix angles and feed speeds were varied under fixed cutting depth (6mm) and spindle speed (12000rpm). Experimental results indicated that all of the specimens showed slight splitting when the tool emerged the workpiece in up-milling and when the tool cut into the workpiece in down-milling. Splitting became more severe when the feed speed was increased from 600mm/min to 4800mm/min. Meanwhilem burrs were observed in all cutting conditions. The helix angle of 2° showed lower cutting resistance than other helix angles. Cutting resistance increased with the increase of helix angle. However, vertical cutting resistance showed higher values with increasing feed speed, whereas horizontal cutting resistance revealed no distinct trend. Furthermore helix angle of 2° or 4° consumed less electrical energy compared with other helix angles. The consumption of electrical energy was negatively related to feed speed. Surface roughness (Rz) increased with increasing feed speed.

並列關鍵字

Straight router-bit ； Helix angle Feed speed ； Milling ； Cutting resistance