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

doi:10.3901/JME.2018.21.212

Abstract

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

CLC Number:

TG580

WU Qiaoping, WANG Yu, ZHAO Hengi, ZHENG Weijia, DENG Zhaohui. Precision Grinding of Ultra-fine Cemented Carbide Based on Electrolytic In-process Dressing of a Multi-layer Brazed Diamond Wheel[J]. Journal of Mechanical Engineering, 2018, 54(21): 212-220.

References

[1] YANG J,ODEN M,JOHANSSON M P,et al. Grinding effects on surface integrity and mechanical strength of WC-Co cemented carbides[J]. Procedia CIRP,2014,13:257-263.
[2] KONYASHIN I,RIES B. Wear damage of cemented carbides with different combinations of WC mean grain size and Co content,Part Ⅱ:Laboratory performance tests on rock cutting and drilling[J]. International Journal of Refractory Metals and Hard Materials,2014,45:230-237.
[3] LIU C,LIN N,HE Y H,et al. The effects of micron WC contents on the microstructure and mechanical properties of ultrafine WC-(micro WC-Co) cemented carbides[J]. Journal of Alloys and Compounds,2014,594:76-81.
[4] AKHTAR F,HUMAIL I S,ASKARI S J,et al. Effect of WC particle size on the microstructure,mechanical properties and fracture behavior of WC-(W,Ti,Ta)C-6 wt% Co cemented carbides[J].International Journal of Refractory Metals & Hard Materials,2007,25:405-410.
[5] XIONG J,GUO Z X,YANG M,et al. Tool life and wear of WC-TiC-Co ultrafine cemented carbide during dry cutting of AISI H13 steel[J]. Ceramics International,2013,39:337-346.
[6] 原一高,畅晓振,施耀祖,等. 超细硬质合金磨削表面残余应力的试验研究[J]. 机械科学与技术,2011,30(7):1217-1220. YUAN Yigao,CHANG Xiaozhen,SHI Yaozhu,et al. Residual surface stress in the grinding of ultrafine grained WC-Co cemented carbides[J]. Mechanical Science and Technology for Aerospace Engineering,2011,30(7):1217-1220
[7] CHATTOPADHYAY A K,HINTERMANN H E. On performance of brazed monolayer diamond grinding wheel[J]. Annals of the CIRP,1991,40:347-350.
[8] CHEN J Y,HUANG H,XU X P. An experimental study on the grinding of alumina with a monolayer brazed diamond wheel[J]. International Journal of Advanced Manufacturing Technology,2009,41:16-23.
[9] YANG Z Y,XU J H,DING W F,et al. Dimension accuracy and surface integrity of creep feed ground titanium alloy with monolayer brazed CBN shaped wheels[J]. Chinese Journal of Aeronautics,2010,23:585-590.
[10] LI S S,XU J H,XIAO B,et al. Performance of brazed diamond cup-type wheels with defined grain pattern in grinding cemented carbide[J].Transactions of Nanjing University of Aeronautics & Astronautics,2007,24(1):54-58.
[11] 詹友基,李远,黄辉,等. 钎焊金刚石砂轮磨削硬质合金的磨削力研究[J]. 中国机械工程,2010,21(15):1844-1849. ZHAN Youji,LI Yuan,HUANG Hui,et al. Investigation of grinding forces for grinding cemented carbide with brazed diamond wheels[J].China Mechanical Engineering,2010,21(15):1844-1849
[12] KATAHIRA K,OHMORI H,UEHARA Y,et al. ELID grinding characteristics and surface modifying effects of aluminum nitride(AIN)ceramics[J].International Journal of Machine Tools & Manufacture,2005,45:891-896.
[13] ZHANG F H,QIU Z J,KANG G W,et al. High efficiency ELID grinding of garnet ferrite[J].Journal of Materials Processing Technology,2002,129:41-44.
[14] YANG L J,REN C Z,JIN X M. Experimental study of ELID grinding based on the active control of oxide layer[J].Journal of Materials Processing Technology,2010,210:1748-1753.
[15] YIN S H,OHMORI H,DAI Y T,et al. ELID grinding characteristics of glass-ceramic materials[J].International Journal of Machine Tools & Manufacture,2009,49:333-338.
[16] 伍俏平,邓朝晖,潘占,等.钎焊气氛对金刚石钎焊性能的影响[J]. 机械工程学报,2012,48(4):51-57. WU Qiaoping,DENG Zhaohui,PAN Zhan,et al. Effect of brazing atmosphere on brazing performance of diamond[J]. Journal of Mechanical Engineering,2012,48(4):51-57.
[17] 伍俏平,邓朝晖,潘占,等. 粉末注射成型金刚石制品的烧结工艺[J]. 硅酸盐学报,2013,41(9):1207-1213. WU Qiaoping,DENG Zhaohui,PAN Zhan,et al. Sintering process of diamond products by powder injection molding[J]. Journal of the Chinese Ceramic Society,2013,41(9):1207-1213
[18] 伍俏平,邓朝晖,潘占,等. 金刚石纤维砂轮的制备及磨削表面质量研究[J]. 机械工程学报,2014,50(11):205-212. WU Qiaoping,DENG Zhaohui,PAN Zhan,et al. Preparation and grinding surface-quality of a new diamond fiber wheel[J]. Journal of Mechanical Engineering,2014,50(11):205-212.
[19] EBBRELL W T. The effects of cutting fluid application methods on the grinding process[J].International Journal of Machine Tools & Manufacture,2000,40:209-223.
[20] 伍俏平,王煜,瞿为,等. 在线电解修整磨削液研究现状及其展望[J]. 中国机械工程,2017,28(9):1118-1125. WU Qiaoping,WANG Yu,QU Wei,et al. Research status and perspectives of ELID grinding fluid[J]. China Mechanical Engineering,2017,28(9):1118-1125.