工程科学学报2018，Vol.40Issue(3)：357-365,9.DOI:10.13374/j.issn2095-9389.2018.03.012
基于微晶刚玉砂轮的20 CrMnTi齿轮成型磨削表面完整性
Surface integrity of form grinding 20 CrMnTi gear based on a new microcrystalline corundum wheel
摘要
Abstract
To study the surface integrity of 20CrMnTi gears for form grinding by a microcrystalline corundum wheel, a grinding experiment on 20CrMnTi gear was performed. Furthermore, the effects of wheel speed, axial feed rate, and radial feed on tooth surface roughness, hardness, microstructure, and residual stresses of the surface/subsurface were studied. The mechanism of the damage caused by grinding and micro-cracks was discussed. The results show that the effect of radial feed on the surface roughness is the most significant. The wheel speed is then the second most significant, and the axial feed rate is the least significant. In addition, an excessive grinding temperature leads to grinding burns, which the quenching burns cause the surface hardness to increase by 5%-20%, and the tempering burns cause the surface hardness to drop by varying degrees. The surface/subsurface structure is composed of a white layer, dark layer, and bulk material, with the white layer on the top and the bulk material being on the bottom. The white layer is composed of a dense martensitic structure, carbide, and retained austenite. The increase in the wheel speed and radial feed then increases the residual tensile stress caused by grinding. Surface residual compressive stress decreases and gradually changes to tensile stress. When the final residual tensile stress is greater than the breaking strength of the material, the surface produces micro cracks, compromising the integrity of the surface.关键词
20CrMnTi/微晶刚玉砂轮/成型磨削/表面完整性/表面缺陷Key words
20CrMnTi/microcrystalline corundum wheel/form grinding/surface integrity/surface detects分类
矿业与冶金引用本文复制引用
刘谦,杨理钧,田欣利,王龙,孟凡卓..基于微晶刚玉砂轮的20 CrMnTi齿轮成型磨削表面完整性[J].工程科学学报,2018,40(3):357-365,9.基金项目
国家科技重大专项资助项目(2015ZX04003006) （2015ZX04003006）
