螺旋铣和坡走铣.ppt

螺旋差补铣Circular interpolation解决方案Pioneering solutions * Ramping from solid在实体上斜走 Circular interpolation走内螺旋线 Machining into corners加工到边角 Rest milling清根 Trochoidal milling摆线铣 Dvf=Dm-De Dm DVf Dc 螺旋差补走－斜走 Circular interpolation – ramping 刀体尺寸的选择Cutter diameter selection 盲孔Blind hole – 平底flat bottom Max Dc = 0.80 x Dm Min Dc = 0.5 x Dm Dc rad De rad 通孔Through hole Max De = 0.80 x Dm ap = Tanθ x Dvf? Dvf = Dm-Dc Circular interpolation – ramping 最大螺距－切深Max pitch - ap Dm DVf DC θ Dvf? ap ap θ = max 坡走角度ramp angle Circular interpolation – ramping 螺旋进给率Calculating feed rates ap Dm DVf DC Vf1 Vf2 Vf2 = n x fz x z Vf1 = Dvf x Vf2  Dm Cos B = Dc2+(Dm-Dc)2-Dw2 2*Dc*(Dm-Dc) θ = 180-B Dc Dw Dm-Dc A B C θ ae = Dc – (Cos θ x Dc) 2 fz = hex sinθ Circular interpolation – (Dm-Dw)/2 Bs 螺旋差补的进入角，铣宽和进给Calculating engagement angle, ae and feed Vf2 = n x fz x z Vf1 = Dvf x Vf2  Dm Dm DVf DC Vf1 Vf2 θ ae Dm Dw DC degrees rota’n per tooth Vftc Vftc Vftc Vftc Vfper Vftc fz fzper 拐角处的加工Machining into a corner进入角，铣宽和进给Engagement angle, ae and feed 拐角处的进给要降低，因为 ：feed needs to be reduced in corner due to:- 铣宽变大；increased ae 周边的进给速度比刀具中心的进给速度快；peripheral feed far greater than tool centre feed θrad aerad DVf DC ae θ rad ln fz fz Vftc Vftc Vfrad Vfper Machining into a cornerEngagement angle, ae and feed Dc/rad ratio Machining into a cornerEngagement angle, ae and feed 拐角处的清根铣削Rest milling into a corner进入角，铣宽和进给Engagement angle, ae and feed aetot = radw - radw + radm - radm sin(θ/2) sin(θ/2) aetot radm (6) radw (20) θ aetot = 14mm aetot = 5.8mm aetot radm (6) radw (20) θ Rest milling into a cornerEngagement angle, for set ae aemax DVf DC rad (6) radw (20) radm (17,5) Cos B = (0.5Dc)2+((radw+ae)-0.5Dc)2-radw2 Dc*((radw+ae)-0.5Dc) θ θ A B C radw Dc (radw+ae)-0.5Dc θ = 180-B aemax = Dc – (Cos θ x Dc) 2 modified feed calculated for respective Dvf Rest milling into a cornerEngagement angle, for set ae aemax DVf DC θ radw radm