摘要
为了改善滑动轴承混合润滑时的摩擦学性能,在锡基巴氏合金表面加工出矩形阵列和发射线阵列的圆坑织构.采用销-盘式摩擦实验机和数值模拟对织构的润滑性能及机理进行分析,研究不同滑动速度和载荷下表面织构的摩擦系数,并数值模拟了表面织构的油膜压力分布.实验结果表明:表面织构能降低混合润滑的摩擦系数.随着滑动速度的增加,表面织构的减摩性能更佳;但是随着接触压力的增加,表面织构的减摩性能降低.相对于发射线阵列织构,矩形阵列织构的摩擦系数更低并且稳定性更好.面密度为8.6%的矩形织构阵列(3#)具有较优的摩擦学特性,在滑动速度0.3m/s、载荷5.0 MPa下的摩擦系数为0.015.模拟结果表明:相对于发射线型阵列织构,矩形阵列织构的油膜压力分布能减小润滑油泄漏,从而获得较好的摩擦学特性.
To improve tribology properties of journal bearing under mixed lubrication,rectangular and linear radiation array textures were fabricated on the Tin base Babbitt alloy surface.Pin-on-disk tribometer and numerical simulation method were employed to investigate the lubrication behavior and mechanism of textured surface.Friction coefficient of textured surface under variation sliding velocities and contact pressure were discussed.The film pressure distributions of textured surfaces were simulated using CFD method.The results suggest that friction coefficient is reduced by the textured surface under mixed lubrication,and the improvement effect is more significantly with the increase of sliding velocity or the decrease of contact pressure.Friction coefficient of rectangular array textured surface is lower and more stable than that of linear radiation textured surface.A density of 8.6%textured surface has the lowest friction coefficient,which is as low as 0.015 at sliding velocity of 0.3m/s and contact pressure of 5.0 MPa.Simulation analysis results demonstrate that the oil film pressure distribution on the rectangular array texture can reduce the oil leakage to obtain better tribological properties,comparing with that on the linear radiation array textures.
出处
《华中科技大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2014年第12期30-34,52,共6页
Journal of Huazhong University of Science and Technology(Natural Science Edition)
基金
国家自然科学基金资助项目(51175406)
关键词
滑动轴承
巴氏合金
表面织构
混合润滑
摩擦系数
journal bearing
Babbitt alloy
surface texturing
mixture lubrication
friction coefficient
