Hydrostatic rotary table kinematic error modeling and computing method

Abstract

The invention discloses a hydrostatic rotary table kinematic error modeling and computing method. The method comprises the steps that a single oil pad theoretical model based on the reynolds equation works out pressure distributions of a prepressing oil pad and a bearing oil pad during kinematic error considering, and then integration is carried out on pressure distributions to obtain bearing force Fy, Fi and Fj of the prepressing oil pad and the bearing oil pad; the oil film thickness of each oil pad is simplified to be the oil film thickness of the center of the oil pad, rotary table machining contour errors are considered and form functions in a fitting mode, and the oil film thickness and speed of each oil pad are determined according to the geometrical relationship between the oil film thickness of the oil pads; a kinetic equilibrium equation of the rotary table is built; the kinetic equation of the rotary table is solved in the Matlab software through the Runge-Kutta Method, so that influences of main parameters such as the rotary table rotating speed, the machining contour errors and the like on the kinematic error are obtained, and a reasonable range is provided for the hydrostatic rotary table machining precision.

Description

technical field [0001] The invention belongs to the field of static pressure turntable analysis, and relates to a static pressure turntable motion error modeling and simulation calculation method supported by a double-circle oil cushion, more specifically, a method for calculating the motion error of a static pressure turntable that considers the rotation speed of the turntable and the processing contour error Modeling and simulation calculation methods. Background technique [0002] Hydrostatic Rotary Table (Hydrostatic Rotary Table) uses pressurized fluid to separate two surfaces with relative motion and carry it by hydrostatic pressure. Since the kinematic pairs are completely separated by the oil film, the friction between the kinematic pairs is greatly reduced, while its bearing capacity, motion accuracy and life are greatly improved. Because of the many advantages of hydrostatic support, it is widely used in heavy machine tools and becomes one of its key components. ...

AI Technical Summary

Problems solved by technology

At present, scholars at home and abroad have conducted extensive and in-depth research on the basic theory of static pressure bearings and the general design method of static pressure turntables, but the research on machining errors of turntables is not sufficient, and the influence of machining errors and machining errors on motion errors is still unknown. No complete theoretical research to analyze

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