Study on Key Characterization Parameters of Surface Integrity in Flexible Polishing of Abrasive Cloth Wheel
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摘要: 航空发动机叶片表面完整性严重影响叶片疲劳强度和服役寿命。为掌握砂布轮柔性抛光叶片表面完整性关键表征参数,基于“数控机床+柔性磨头+弹性磨具(砂布轮)”的抛光工艺装备开展了TC4叶片抛光试验和表面完整性检测,对比了抛光前后表面完整性各项表征参数变化,分析了变化机理,结果表明:砂布轮柔性抛光对叶片表面粗糙度、表面微观形貌、表面残余应力、表面显微硬度有明显改善,对深度方向残余应力、深度方向显微硬度、微观组织没有影响。研究结果为砂布轮抛光表面完整性控制提供了依据。Abstract: The surface integrity of aeroengine blades seriously affects the fatigue strength and service life of the blades. In order to master the key parameters of the surface integrity of the flexible polishing blade of abrasive cloth wheel, the polishing test and the surface integrity test of TC4 blade were carried out based on the polishing technology equipment of "NC machine + flexible grinding head + elastic grinding tool (abrasive cloth wheel) ". The changes of surface integrity parameters before and after polishing were compared, and the changes mechanism was analyzed, the results show that the flexible polishing of abrasive cloth wheel can obviously improve the surface roughness, surface micro-morphology, surface residual stress and surface micro-hardness, however, the residual stress in depth direction, microhardness in depth direction and microstructure were not affected. The results provide a basis for surface integrity control of abrasive cloth wheel.
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Key words:
- flexible polishing /
- blade /
- surface integrity /
- key characterization parameters
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表 1 TC4钛合金化学成分
% 合金 ω(Al) ω(V) ω(Fe) ω(Si) ω(C) ω(N) ω(H) ω(O) 其他 TC4 5.5 ~ 6.8 3.5 ~ 4.5 ≤0.30 ≤0.15 ≤0.10 ≤0.05 ≤0.01 ≤0.20 0.11 表 2 TC4钛合金力学性能
合金 布氏
硬度HB抗拉强度
σb/MPa伸长率
δ/%冲击值ak/
(J·cm–2)热导系数λ/
(J·(cm·s·℃)–1)TC4 320 ~ 360 932 10 39.24 0.068 表 3 抛光工艺参数
参数 数值 砂布轮粒度 1000 主轴转速n/(r·min–1) 6000 进给速度v/(m·min–1) 250 压缩量ap/mm 0.3 -
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