粗粒度金刚石砂轮的放电赋能磨削修整试验研究  

Experimental Investigation of Discharge Aided Grinding Dressing Method of Coarse-grained Diamond Wheels

作　　者：戴隆州 毛聪[1] 张明军[1] 陈根余[2] DAI Longzhou;MAO Cong;ZHANG Mingjun;CHEN Genyu(Hunan Provincial Key Laboratory of Intelligent Manufacturing Technology for High-performance Mechanical Equipment,Changsha University of Science and Technology,Changsha,410114;National Engineering Research Center for High Efficiency Grinding,Hunan University,Changsha,410082)

机构地区：[1]长沙理工大学机械装备高性能智能制造关键技术湖南省重点试验室,长沙410114 [2]湖南大学国家高效磨削工程技术研究中心,长沙410082

出　　处：《中国机械工程》2024年第10期1762-1773,共12页China Mechanical Engineering

基　　金：国家自然科学基金(51875050)。

摘　　要：针对粗粒度金刚石砂轮磨粒出刃形貌难以控制的问题,提出了放电赋能磨削修整技术,旨在实现出刃磨粒的等齐性。系统研究了该复合修整技术的材料去除机理,建立脉冲放电传热数值模型,以金刚石热软化深度作为磨削深度,最大限度发挥放电赋能磨削的修整优势。探究了机床运动参数(待修砂轮转速、刀具轮转速、进给速度、磨削深度)对砂轮修整精度和刀具轮损耗深度的影响规律,并优化了工艺参数以实现粗粒度砂轮的高效高精修整。磨粒粒度为180目的金刚石砂轮修整后轮廓误差PV值为11.97μm。修整砂轮表面形貌检测结果表明,放电赋能磨削修整可将磨粒部分去除,使得砂轮表面磨粒具有较好的等齐性。磨削的碳化硅陶瓷工件表面粗糙度达412 nm,表明了修整砂轮具有优异的磨削性能。The problems of difficult to control the morphology of abrasive grains on coarse-grained diamond grinding wheels were presented.A discharge aided grinding dressing technology was proposed to achieve the uniformity of abrasive grains on the cutting edges.The material removal mechanism of this hybrid dressing was systematically analyzed.The numerical models of pulse discharge heat transfer were established,and the thermal softening depth of diamond was used as the grinding depth,which was conducive to the advantages of the hybrid dressing method.The influences of machine tool kinematic parameters(such as the speed of the grinding wheel,the speed of the tool wheel,the feed speed,and the grinding depth)on the grinding wheel dressing accuracy and the loss depth of tool wheel in the discharge aided grinding dressing method were investigated,and the processing parameters were optimized to achieve high efficiency and precision dressing of coarse-grained grinding wheels.The profile error PV value of the diamond grinding wheels with a grain size of 180#is as 11.97μm.The inspection results of the surface morphology of the dressing wheel indicate that discharge powered grinding may partially remove the abrasive particles,resulting in good homogeneity of the abrasive particles on the surfaces of the grinding wheel.The surface roughness of the ground silicon carbide ceramic workpiece reaches 412 nm,indicating that the dressing wheel has excellent grinding performance.

关 键 词：放电赋能磨削 金刚石砂轮 砂轮修整 轮廓精度 

分 类 号：TG661[金属学及工艺—金属切削加工及机床]