纳米硬质合金高速深磨工艺试验研究  

Experimental investigation on high speed deep grinding characteristics of the nano-cemented carbides

作　　者：杨军 黄向明[1] 蒋福星[1] 蒋为[1] 

机构地区：[1]湖南大学机械与运载工程学院,长沙410082

出　　处：《现代制造工程》2015年第10期12-17,21,共7页Modern Manufacturing Engineering

基　　金：国家自然科学基金项目(51475158);湖南省自然基金项目(12JJ5011)

摘　　要：采用树脂结合剂金刚石砂轮对不同晶粒度硬质合金进行了高速深磨试验,对比分析了砂轮速度、磨削深度以及工作台速度对磨削力、表面粗糙度及磨削表面形貌的影响,分析了纳米硬质合金材料高速深磨去除机理。试验结果表明:随着砂轮速度增加,工作台速度降低和磨削深度减小,将导致最大未变形磨屑厚度减小,单位面积磨削力减小,比磨削能增加,表面塑性去除比例增加。随着晶粒度的减少,磨削力和比磨削能降低,表面粗糙度值减少,纳米硬质合金更易表现为脆性断裂方式去除。对纳米硬质合金采用高速深磨工艺技术可以提高加工效率,同时可以保证较好的表面质量。An investigation was undertaken to explore the grinding characteristics in high speed deep grinding of cemented carbide with various grain sizes by using resin-bonded diamond wheels. The experimental investigation focuses on the grinding force, sur- face roughness and the ground surface quality, which influenced by various wheel speeds, feed rates and depths of cut. Experimen- tal results have shown that the increasing of wheel speed, and the decreasing of feed rates and cut depths of cut will lead to the decreasing of maximum chip thickness, grinding force, and improvement of surface quality. A better surface finish, decreased grinding force and specific grinding energy are obtained on the workpiece with a smaller grain size, and the nano-cemented car- bide＇ s removal mechanisms are more likely to be brittle. The application of high deep speed grinding on nano-cemented carbide can not only improve the machining efficiency, but also obtain a better surface finish.

关 键 词：高速深磨 纳米硬质合金 磨削力 表面粗糙度 

分 类 号：TG580.6[金属学及工艺—金属切削加工及机床]