Kinetic model-based design method for fit clearance of machine tool spindle bearing

Abstract

The invention provides a kinetic model-based design method for a fit clearance of a machine tool spindle bearing. The method comprises the steps of 1) simplifying the structure of a machine tool spindle into a bearing-rotor system; 2) establishing a kinetic model of the machine tool spindle; 3) based on the kinetic model, calculating a radial displacement and vibration response of a spindle rotor for a bearing outer ring and a bearing seat of the spindle under different fit clearances; 4) drawing a polar coordinate diagram of a radial displacement and vibration signal of the spindle rotor and balancing a radial rotating error of the spindle rotor by using a least square circle method; and 5) according to a relationship curve of the different fit clearances of the bearing outer ring and the bearing seat of the spindle and the radial rotating error of the spindle rotor, guiding design of the fit clearance of the bearing outer ring and the bearing seat of the spindle. According to the method, the influence of a fit clearance value of the bearing outer ring and the bearing seat of the spindle on the radial rotating precision of the spindle rotor is quantitatively considered, the technical guide is provided for installation and matching of the machine tool spindle, and an effective technology is provided for improving the rotating precision of the machine tool spindle.

Description

【Technical field】 [0001] The invention belongs to the field of machine tool spindle design, and relates to a design method for the fit gap of the machine tool spindle, in particular to a dynamic model-based design method for the fit gap of the machine tool spindle bearing. 【Background technique】 [0002] The machine tool spindle is the core component of the machine tool, and its performance is directly related to the processing performance of the machine tool. At present, machine tool spindles are developing towards high-speed, high-precision, high-efficiency high-performance electric spindles. There is still a big gap between domestic high-performance machine tool spindles and high-performance spindles in developed countries. The maximum speed of the electric spindle developed abroad for milling can reach 60000r / min, the D mn value of the spindle bearing is as high as 2.4 million mm*r / min, and the rotation accuracy of the spindle can reach within 1μm; while the current dom...

AI Technical Summary

Problems solved by technology

The only research is only a qualitative study of the impact of the tolerance of the bearing outer ring and the bearing seat on the bearing and the bearing seat, and has not quantitatively reflected the relationship between the bearing outer ring and the bearing seat fit clearance and the spindle rotation error, and used this to design the bearing outer ring Fitting clearance with bearing seat

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