Method for calculating properties of hydrostatic oil pad by considering inclination and heat

Abstract

The invention discloses a method for calculating various properties of a hydrostatic oil pad by considering inclination and heat. According to the method, influences from inclination and the heat are considered, and pressure distribution and temperature distribution of the oil pad are calculated through the finite difference method. The method comprises the following steps that firstly, an N-S equation and an energy equation are simplified and a two-dimension Reynolds equation is deduced; secondly, dimensionless processing is conducted on the equations; thirdly, the bearing capacity, rigidity and damping of the oil pad are calculated; finally, on the basis of the finite difference method, a calculation program is written through Matlab so as to obtain parameters of the properties of the oil pad. The method is characterized in that the simplified N-S equation is used for deducing the Reynolds equation, and the energy equation and the Reynolds equation are coupled with each other through a viscosity-temperature equation and a density-temperature equation. The coupled equation is solved through the finite difference method, the bearing capacity of the oil pad is obtained through the bearing surface integral, and the rigidity and the damping are obtained by deriving the bearing capacity. The method can provide guidance for use and design of a rotary table.

Description

technical field [0001] The invention belongs to the field of static pressure turntable analysis, and relates to a method for calculating the bearing capacity, stiffness and damping of a turntable supporting oil pad with quantitative oil supply. The method uses the finite difference method to calculate and considers the effects of frictional heat and inclination. Background technique [0002] Hydrostatic Rotary Table uses pressurized fluid to separate two surfaces with relative motion and carries them 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. The hydrostatic oil pad is a key component of the hydrostatic turntable support system. It is usually considered in it...

AI Technical Summary

Problems solved by technology

The hydrostatic oil pad is a key component of the hydrostatic turntable support system. It is usually considered in its design that it will always be parallel to the guide rail surface. However, this is not realistic. In fact, due to processing and assembly errors, local deformation of the turntable and the influence of partial load It is often difficult to maintain parallelism between the oil pad and the rail surface

The heating of the oil is also a key factor affecting the performance of the oil pad. It reduces the viscosity of the oil and also causes thermal deformation of the turntable, which affects the accuracy of the turntable.

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