Preparation of Porous Brazed Grinding Wheels and Experimental Research of SiC Ceramic Grinding

doi:10.3969/j.issn.1004-132X.2022.15.004

Abstract

Abstract: Based on the molding and vacuum solid-phase sintering processes，a porous brazed diamond grinding wheel（PBDGW）with high bonding strength and uniform pore distribution was prepared by using Cu-10Sn binder，oxidation pretreated TiH2 brazed pore-forming agent and MBD8 diamond abrasive particles. The SiC ceramic grinding experiments of PBDGW and multilayer brazed diamond grinding wheel（MBDGW） were carried out for comparison，then the grinding performances of grinding wheel were analyzed from grinding force，workpiece surface roughness and surface/sub-surface morphology. The experimental results show that the tangential force in SiC ceramics grinding with PBDGW decreases by 8.4%～23.6%，the normal force decreases by 10.2%～38.6%，and the average reduction of surface roughness is as 10.4%. The workpiece surface has better integrity，and the surface/sub-surface brittle fracture，microscopic crack and other defects are less.

Key words: porous, brazed grinding wheel, TiH2, SiC ceramics, grinding performance

摘要： 基于模压成形和真空固相烧结工艺，选用Cu-10Sn结合剂、经氧化预处理的TiH2钎焊造孔剂、MBD8金刚石磨粒，制备出磨粒把持力大、孔隙分布均匀的多孔钎焊金刚石砂轮（PBDGW）。开展PBDGW与多层钎焊金刚石砂轮（MBDGW）的SiC陶瓷磨削对比试验，从磨削力、工件表面粗糙度和表面/亚表面形貌等方面分析砂轮的磨削性能。试验结果表明：与MBDGW相比，PBDGW磨削SiC陶瓷的切向力下降了8.4%～23.6%、法向力下降了10.2%～38.6%，磨削加工表面粗糙度平均降幅为10.4%；工件表面完整性较好，表面/亚表面的脆性断裂、微观裂纹等缺陷较少。

关键词: 多孔, 钎焊砂轮, TiH2, SiC陶瓷, 磨削性能

CLC Number:

TG74
TG580.6

LIU Wei, MAO Guoan, YAN Can, LI Boxin, . Preparation of Porous Brazed Grinding Wheels and Experimental Research of SiC Ceramic Grinding[J]. China Mechanical Engineering, 2022, 33(15): 1787-1793.

刘伟, 毛国安, 严灿, 李博鑫, . 多孔钎焊砂轮的制备及SiC陶瓷磨削试验研究[J]. 中国机械工程, 2022, 33(15): 1787-1793.

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