小直径青铜结合剂微粉砂轮的电火花精密修整实验研究

doi:10.3901/JME.2019.03.199

机械工程学报 ›› 2019, Vol. 55 ›› Issue (3): 199-207.doi: 10.3901/JME.2019.03.199

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小直径青铜结合剂微粉砂轮的电火花精密修整实验研究

余剑武^1,2, 何利华^1,3, 尚振涛², 罗红^1,4, 梁七华⁴

1. 湖南大学汽车车身先进设计制造国家重点实验室长沙 410082;
2. 湖南大学国家高效磨削工程技术研究中心长沙 410082;
3. 杭州电子科技大学机械工程学院杭州 310018;
4. 苏州昌景数控设备有限公司苏州 325000

收稿日期:2018-02-12 修回日期:2018-06-05 出版日期:2019-02-05 发布日期:2019-02-05
通讯作者: 何利华(通信作者),男,1987年出生,博士研究生,讲师。主要研究方向为特种加工技术,超硬磨料砂轮数控精密修整技术与装备。E-mail:helihua0617@yahoo.com
作者简介:余剑武,男,1968年出生,博士,教授,博士研究生导师。主要研究方向为特种加工技术,数字化设计与制造技术,先进材料复杂曲面精密加工技术及数控装备。E-mail:yokenbu@yahoo.com
基金资助:
国家科技重大专项（2012ZX04003-101）、湖南省自然科学基金（2015JJ2026）和苏州吴中区科技（WC201523）资助项目。

Experimental Investigation on Precision Electrical Discharge Dressing of Small-diameter Bronze-bonded Fine Grain Grinding Wheel

YU Jianwu^1,2, HE Lihua^1,3, SHANG Zhentao², LUO Hong^1,4, LIANG Qihua⁴

1. State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body, Hunan University, Changsha 410082;
2. National Engineering Research Center for High Efficiency Grinding, Hunan University, Changsha 410082;
3. Faculty of Mechanical Engineering, Hangzhou Dianzi University, Hangzhou 310018;
4. Suzhou Changjing CNC Equipment Co., Ltd, Suzhou 325000

Received:2018-02-12 Revised:2018-06-05 Online:2019-02-05 Published:2019-02-05

摘要/Abstract

摘要： 青铜结合剂微粉金刚石砂轮常用于脆硬材料的超精密磨削加工，但其修整十分困难；采用内冲式弧面铜钨电极对W10青铜结合剂微粉金刚石砂轮进行了电火花修整试验研究；搭建试验平台并设计三种不同弧度的内冲式电极，采用超景深三维显微镜、精密粗糙度仪、CCD激光位移传感器以及扫描电子显微镜，对修整后的砂轮进行了表面形貌检测、轮廓检测和磨削性能测试；检测结果表明60°弧面电极的内冲效果最好，修整砂轮表面磨粒突出明显，数量较多且密集度高，金刚石磨粒保存完好；砂轮圆跳动误差值最小，可达1.7 μm、1.8 μm、1.8 μm；试验验证了采用60°弧面电极修整砂轮的磨削性能最好，加工的试件表面粗糙度可达Ra2.273 nm，已基本达到超精密镜面磨削的质量。

关键词: 表面微观形貌, 电火花修整, 弧面电极, 微粉砂轮, 圆跳动误差

Abstract: Fine grain bronze-bonded diamond grinding wheel is usually used in ultra-precision machining of hard and brittle materials, but it is difficult for dressing because of the high hardness of the diamond and the strong adhesion of bronze-bond. Inner-flushing curved electrodes are used in electrical discharge dressing of W10 fine grain bronze-bonded diamond grinding wheel. The experimental platform is set up and three different degrees of inner-flushing curved electrodes are designed. The Keyence VHX6000 3D microscope, roughness profile measurement instrument, CCD laser displacement sensor and meter and SEM are employed to investigate the surface micro topography, profile of dressed grinding wheel and grinding test. It is found that improvement of inner-flushing of 60°-curved electrode is best and the protrusion of diamond grains on surface of after dressing is clearly observed with uniformly distribution and unburned during electrical discharge dressing; the minimum circular runout error can reach 1.7 μm, 1.8 μm and 1.8 μm. It is also verified by grinding experiment that surface roughness by grinding wheel with 60°-curved electrode is Ra2.273 nm, which can reach the high quality level of ultra-precision mirror grinding.

Key words: circular runout error, curved electrode, electrical discharge dressing, fine grain grinding wheel, surface micro topography

中图分类号:

TG661

余剑武, 何利华, 尚振涛, 罗红, 梁七华. 小直径青铜结合剂微粉砂轮的电火花精密修整实验研究[J]. 机械工程学报, 2019, 55(3): 199-207.

YU Jianwu, HE Lihua, SHANG Zhentao, LUO Hong, LIANG Qihua. Experimental Investigation on Precision Electrical Discharge Dressing of Small-diameter Bronze-bonded Fine Grain Grinding Wheel[J]. Journal of Mechanical Engineering, 2019, 55(3): 199-207.

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小直径青铜结合剂微粉砂轮的电火花精密修整实验研究

Experimental Investigation on Precision Electrical Discharge Dressing of Small-diameter Bronze-bonded Fine Grain Grinding Wheel

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