【摘要】 为了研究表面织构对高速精密机床支撑滑动轴承系统振动的影响,利用一种在轴颈表面大规模加工表面织构的低成本、高效率的方法,设计并制备了带有表面织构的转子。采用无织构和有织构两种转子,在供水压力分别为0.16MPa、0.30MPa及工作转速分别为2 400r/min、4 200r/min和6 000r/min的工况下,采用在主轴上附加不平衡质量的方法施加同频激振力,分别对无织构转子和有织构转子的振动进行测试分析。实验结果表明:在一定供水压力和转速条件下,表面织构抑制转子轴承系统振动的作用变得非常明显,有织构转子较无织构转子的相对振动量下降幅度超过60%,即使在发生水膜振荡的情况下,表面织构依然可以显著减小转子的振动幅值。因此,合理的表面织构设计,可以有效提高径向滑动轴承支撑的转子系统的稳定性。更多还原

【Abstract】 Aiming at engineering application of surface texture in high speed and high precision machine tool bearings,an effective and simple process was conducted to make texture on the journal surface.The surface texture influence on rotor-journal bearing system stability was experimentally investigated.The rotor was excited by the unbalance mass,and the vibration displacements of journals with and without texture were measured and compared under supplied pressures of 0.16MPa and 0.30 MPa,and at rotating speeds of 2 400r/min,4 200r/min and 6 000r/min.The experiments reveal that the surface texture slightly affects vibration amplitude in the case of lower supplied pressure and rotating speed,but the surface texture is able to reduce vibration significantly at certain rotating speeds.The supply pressure becomes important for the bearing stability,and the vibration amplitude under higher supplied pressure gets greater than that under lower supplied pressure.However,surface texture restrains rotor-bearing system vibration effectively even if oil whirl arises,and the relative vibration amplitude reduces by 60% in the rotor with surface texture.更多还原