基于放电修锐的粗金刚石砂轮干式镜面磨削技术  

Dry Mirror Grinding Technology of Coarse Diamond Grinding Wheel Based on Electrical Discharge Dressing

作　　者：鲁艳军 关伟锋 孙佳劲 莫睿 伍晓宇[1] LU Yanjun;GUAN Weifeng;SUN Jiajing;MO Rui;WU Xiaoyu(College of Mechatronics and Control Engineering,Shenzhen University,Shenzhen,Guangdong,518060)

机构地区：[1]深圳大学机电与控制工程学院,深圳518060

出　　处：《中国机械工程》2023年第9期1052-1060,共9页China Mechanical Engineering

基　　金：广东省自然科学基金青年提升项目(2023A1515030249);国家自然科学基金(51805334);深圳市国际科技合作项目(GJHZ20190822091805371)。

摘　　要：为解决超硬金刚石砂轮修锐效率较低以及环境友好性等问题,采用干式接触放电修锐(ECD)技术对粗金刚石砂轮进行修锐,获得较高的磨粒出刃,可以实现硬质合金和模具钢等高强高硬材料的高效精密镜面磨削加工。对46#金属结合剂粗金刚石砂轮进行机械修锐和干式ECD修锐,再利用修锐后的粗金刚石砂轮对硬质合金和模具钢进行干式轴向磨削加工,对比分析两种修锐条件下磨削工艺参数对硬质合金干磨削力、磨削表面粗糙度和磨削力比的影响。实验结果表明:硬质合金的干式轴向磨削力及其表面粗糙度随砂轮速度的增大而减小,随进给速度和切削深度的增大而增大;与机械修锐相比,干式ECD修锐能够获得更高的磨粒出刃和更好的表面质量,以及更小的磨削力和磨削力比;硬质合金和模具钢的干磨削表面粗糙度Ra分别可达0.058μm和0.022μm。In order to solve the problems of low efficiency and environmental friendliness of ultra-hard diamond grinding wheels,ECD dressing method was used to dress coarse diamond grinding wheels to obtain high micro grain protrusion to realize efficient and precise mirror grinding of high strength and hard materials such as cemented carbide and die steel.The 46#metal-bonded coarse diamond grinding wheels were dressed by mechanical dressing and dry ECD dressing.The dressed diamond grinding wheels were used to dry axial grind cemented carbide and die steels.The influences of grinding parameters on dry grinding force,ground surface roughness and grinding force ratio of cemented carbide under mechanical and dry ECD grinding conditions were compared and analyzed.The experimental results show that the dry axial grinding forces and surface roughness of cemented carbide decrease with the increase of wheel speed,and increase with the increase of feed speed and cutting depth.Compared with mechanical dressing,the dry ECD dressing may achieve higher micro grain protrusion and better ground surface quality,as well as produce little grinding force and grinding force ratio.The dry ground surface roughness Ra of cemented carbide and die steel are as 0.058μm and 0.022μm,respectively.

关 键 词：粗金刚石砂轮 放电修锐 机械修锐 磨削力 表面粗糙度 

分 类 号：TH161.14[机械工程—机械制造及自动化] TG580.6[金属学及工艺—金属切削加工及机床]