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- 2018
高速电主轴中主轴-机壳振动传递力学模型
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Abstract:
主轴的振动是影响机床加工精度的重要因素，且包含大量机床的工况信息。在保证精度的条件下，为实现主轴振动加速度能够在机壳外部测量，建立了主轴与机壳之间的振动传递力学模型。针对力学模型中的未知参数，基于Hertz理论和最小二乘法理论相结合的方法求解出轴承的线性刚度；基于Hooke定律，利用Ansys软件求解出电主轴固定基座的刚度。以170XDS20Z11型电主轴作为实验对象进行实验验证与仿真分析。结果表明：在机壳上测量振动信号，通过该模型可以高效、准确地推导出主轴真实振动。此理论可以运用到主轴振动间接测量方法中，提高测量精度。
Abstract：Spindle vibration is an important factor affecting the machining accuracy of machine tools with the vibrations reflecting a large amount of working condition information about the machine tool. A vibration transmission mechanics model was developed to model the coupling between the shaft and the chassis to improve machining accuracy when measuring the acceleration of the main shaft outside the shell. Hertz theory was used to calculate the bearing stiffness because of unknown parameters in the mechanical model. The base stiffness was calculated using Ansys and Hooke's theory. The vibrations of a 170XDS20Z11 motorized spindle were analyzed with the results showing that the spindle vibrations can be efficiently and accurately measured by measuring the shell vibrations. This theory can be applied to indirect measurements of spindle vibrations to improve measurement accuracy.
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