机械工程学报 >

2018 , Vol. 54 >Issue 21: 212 - 220

DOI: https://doi.org/10.3901/JME.2018.21.212

制造工艺与装备

基于多层钎焊金刚石砂轮在线电解修整技术的超细晶硬质合金精密磨削研究

  • 伍俏平 ,
  • 王煜 ,
  • 赵恒 ,
  • 郑维佳 ,
  • 邓朝晖
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  • 1. 湖南科技大学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

收稿日期: 2018-03-05

  修回日期: 2018-08-16

  网络出版日期: 2018-11-05

基金资助

国家自然科学基金（51575179，51205126）和湖南省自然科学基金（2017JJ3073，12JJB006）资助项目。

收起

Precision Grinding of Ultra-fine Cemented Carbide Based on Electrolytic In-process Dressing of a Multi-layer Brazed Diamond Wheel

  • WU Qiaoping ,
  • WANG Yu ,
  • ZHAO Hengi ,
  • ZHENG Weijia ,
  • DENG Zhaohui
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  • 1. Hunan Province Key Laboratory of High Efficiency and Precision Machining of Difficult to Machine Materials, Hunan University of Science and Technology, Xiangtan 411201;
    2. Institute of Intelligent Manufacturing, Hunan University of Science and Technology, Xiangtan 411201

Received date: 2018-03-05

  Revised date: 2018-08-16

  Online published: 2018-11-05

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摘要

利用模压成型技术和真空钎焊技术制备出了磨粒把持力大、力学性能优良的多层钎焊金刚石砂轮；采用在线电解修整技术促使磨钝的磨粒及时脱落，使砂轮在磨削过程中始终保持锋利性；并开展了基于多层钎焊金刚石砂轮在线电解修整技术的超细晶硬质合金精密磨削试验。试验结果表明：在相同磨削条件下，多层钎焊砂轮在线电解修整磨削力较无修整时的磨削力下降了33.7%～57.9%；多层钎焊砂轮在线电解修整磨削技术能有效提高加工表面质量。当进给速度为30 mm/s，磨削深度为15 μm时，无电解磨削加工表面粗糙度为0.35 μm，而在线电解修整磨削表面粗糙度仅为82.1 nm；多层钎焊砂轮在线电解修整磨削残余应力仅为无电解磨削时的38.2%～49.5%。且在线电解修整磨削表面完整性较好，没有出现表面/亚表面裂纹等相关缺陷，可实现超细晶硬质合金等难加工材料的高效精密加工。

关键词： 多层钎焊金刚石砂轮; ELID磨削; 超细晶硬质合金; 磨削力; 表面粗糙度

本文引用格式

伍俏平 , 王煜 , 赵恒 , 郑维佳 , 邓朝晖 . 基于多层钎焊金刚石砂轮在线电解修整技术的超细晶硬质合金精密磨削研究[J]. 机械工程学报, 2018 , 54(21) : 212 -220 . DOI: 10.3901/JME.2018.21.212

Abstract

A multi-layer brazing diamond wheel with high bonding strength and good mechanical properties is prepared by molding technology and vacuum brazing technology. The electrolytic in-process dressing (EILD) is adopted to make the worn diamonds falling off in time, which could keep the brazing wheel sharp during grinding process. A precision grinding experiment is carried out on the ultra-fine cemented carbide based on the EILD grinding with the multi-layer brazing wheel. The tests indicate that the ELID technique had effectively realized the continuous sharpness for the multi-layer brazing wheel, which resulted in a reduced grinding force by 33.7%~57.9%. The ELID grinding effectively improve the surface quality of a ground work-piece. The non-ELID grinding offered surface roughness 0.35 μm at 30 mm/s feed speed and 15μm grinding depth, which was compared to 93.1 nm from the ELID grinding with the multi-layer brazed wheel. And the residual stress of ELID grinding of the multi-layer brazing wheel is only about 38.2%-49.5% of that of the non-ELID grinding. And the surface integrity of ELID grinding is good; there are no defects such as micro-cracks in the surface/subsurface. The proposed ELID grinding with the multi-layer brazed diamond wheel effectively realized the high efficiency and precision grinding of ultra-fine cemented carbide.

Key words： multi-layer brazed diamond wheel; ELID grinding; ultra-fine cemented carbide; grinding force; surface roughness

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