碳纳米管对大粒度多层钎焊金刚石砂轮电解修整磨削性能的影响研究  

Influence of Carbon Nanotubes on Electrolytic Dressing Grinding Performance of a Multi-layer Brazed Coarse-grained Diamond Wheel

作　　者：伍俏平 欧阳志勇 阳慧 宋琨 邓朝晖 WU Qiaoping;OUYANG Zhiyong;YANG Hui;SONG Kun;DENG Zhaohui(Hunan Province Key Laboratory of High Efficiency and Precision Machining of Difficult to Machine Materials,Xiangtan 411201;Institute of Intelligent Manufacturing,Hunan University of Science and Technology,Xiangtan 411201)

机构地区：[1]难加工材料高效精密加工湖南省重点实验室,湘潭411201 [2]湖南科技大学智能制造研究院,湘潭411201

出　　处：《机械工程学报》2020年第7期231-239,共9页Journal of Mechanical Engineering

基　　金：国家自然科学基金(51575179,51205126);湖南省自然科学基金(2017JJ3073,12JJB006);湖南省教育厅重点项目(18A182)资助项目。

摘　　要：制备了一种含碳纳米管电解液以用于大粒度多层钎焊金刚石砂轮的电解修整,并分析了碳纳米管对电解氧化膜特性及电解修整磨削性能的影响。研究结果表明碳纳米管能显著提高电解液的电解能力,电解氧化膜厚度增大了56.3%~80.2%,这有利于磨损磨粒的顺利脱落;螺旋卷曲状的碳纳米管在电解过程中能吸附、分布于氧化膜中,氧化膜的粘附强度增大了30%~50%,这能充分发挥氧化膜的研磨、抛光效果。含碳纳米管电解液电解修整大粒度多层钎焊金刚石砂轮磨削力比普通电解液电解修整磨削力降低了30%以上;磨削表面粗糙度小,且增长幅度相对平缓,即使当进给速度为30mm/s,磨削深度为16μm时,表面粗糙度也仅为0.15μm左右;含碳纳米管电解液电解修整大粒度多层钎焊金刚石砂轮磨削加工表面完整性较好,没有出现破碎、裂纹等加工缺陷,可有效实现超细晶硬质合金等难加工材料的高效精密磨削加工。An electrolyte containing carbon nanotubes(CNTs) is prepared for electrolytic dressing of a multi-layer brazed coarse-grained diamond grinding wheel, and the influence of CNTs on the characteristics of oxide film and the electrolytic dressing grinding performance are investigated. The results indicated that CNTs could significantly improve the electrolytic capacity of electrolyte, and the thickness of oxide film increased by 56.3% to 80.2%, which allowed the worn diamond grits to fall off smoothly. CNTs are adsorbed and distributed in the oxide film during electrolytic dressing, and the adhesion strength of the oxide film increases by 30%-50%, which could improve the polishing effect of the oxide film. The grinding experiment results shows that the grinding force of the multi-layer brazed coarse-grained diamond wheel after electrolytic dressing with electrolyte containing CNTs decreased by 30%. The grinding surface roughness is small and the increase rate is relatively gentle. When the feed speed is 30 mm/s and the grinding depth is 16 μm, the surface roughness is just about 0.15 μm. Moreover, the integrity of surface ground by the brazed wheel after electrolytic dressing with electrolyte containing CNTs is good, there are no cracks and other defects. It could effectively realize the high efficiency and precise grinding of ultra-fine cemented carbide and other difficult-to-cut materials.

关 键 词：碳纳米管 大粒度多层钎焊金刚石砂轮 电解修整 超细晶硬质合金 氧化膜 磨削性能 

分 类 号：TG521[金属学及工艺—金属切削加工及机床]