硬质合金立铣刀螺旋槽磨削表面粗糙度模型研究  

Roughness Model for Helical Flute of Cemented Carbide End Mill under Grinding

作　　者：宋铁军[1] 周志雄[1] 李伟[1] 黄向明[1] 陈启迪[1] 

机构地区：[1]湖南大学机械与运载工程学院,长沙410082

出　　处：《机械工程学报》2017年第17期185-192,共8页Journal of Mechanical Engineering

基　　金：国家科技重大专项资助项目(2012ZX04003-041)

摘　　要：基于立铣刀螺旋槽的加工原理,根据安装参数确定砂轮磨削螺旋槽的磨削接触区;分析螺旋槽磨削接触区内砂轮与工件的等效直径和有效速度,发现立铣刀螺旋槽磨削既有外圆磨削的特点也有内圆磨削的特征。考虑硬质合金工件材料塑性隆起和砂轮速度与工件速度之间夹角对表面粗糙度的影响,建立立铣刀螺旋槽磨削表面粗糙度计算模型,分析砂轮直径、砂轮速度和工件进给速度对磨削表面粗糙度的影响。在五轴联动数控工具磨床上使用金刚石平行砂轮进行螺旋槽磨削试验。使用超景深显微镜对立铣刀螺旋槽磨削表面形貌进行分析,使用白光干涉仪测量螺旋槽磨削表面粗糙度大小。试验结果验证了硬质合金立铣刀螺旋槽磨削表面粗糙度计算模型的正确性。该模型为其他整体式刀具螺旋槽磨削表面粗糙度的计算提供了理论参考。Based on the machining principle of end milling helical flute,the grinding contact area in flute grinding is determined by the grinding wheel position. The equivalent diameters and speeds of the wheel and workpiece in flute grinding are analyzed in the contact area. There exist characteristics of cylindrical grinding and internal grinding in helical flute grinding. Then, considering the effect of plastic upheaval deformation of cemented carbide and tilt angle between wheel speed and workpiece speed on surface roughness, the theoretical model of the surface roughness of helical is established. The effects of grinding wheel diameter, grinding wheel speed and workpiece feed rate on the surface roughness are analyzed. The helical flute grinding test is carried out on a five-axis CNC tool grinder using a standard 1A1 diamond grinding wheel. The surface morphology is investigated by using digital microscope. The surface roughness is measured by white light interferometer. Finally, the validity of the proposed model is verified through grinding experiments. This model provides a theoretical reference for the grinding surface roughness calculation of other shank-type tool helical flute.

关 键 词：螺旋槽 缓进给磨削 表面粗糙度 硬质合金 立铣刀 

分 类 号：TG580[金属学及工艺—金属切削加工及机床]