Method for researching thermal characteristics of static pressure rotating worktable under extreme conditions

Abstract

The invention discloses a method for researching thermal characteristics of a static pressure rotating worktable under extreme conditions. A relationship among flow, bearing capacity and oil film thickness of a dual rectangular cavity oil pad structure is subjected to theoretical derivation. The heat emission coefficients of the worktable under different extreme conditions are calculated out by applying a heat conduction theory; and the calculation of a convective heat transfer coefficient of the rotating worktable can be divided into the calculation of an upper surface and a side surface, namely, the calculation of a convective heat transfer coefficient of the upper surface can be likened to that a fluid flows through a horizontal plate, and the calculation of a convective heat transfer coefficient of the side surface can be likened to that the fluid transversely skims over a vertical plane wall. An area trisection method is proposed; the convective heat transfer coefficient of each part of the upper surface of the rotating worktable is calculated; and finally a mean value is calculated to serve as the convective heat transfer coefficient of the rotating worktable. A base is divided into two parts, namely natural convective heat transfer of the surface of the vertical plane wall and natural convective heat transfer coefficient of the horizontal plate with a downward hot surface, and the convective heat transfer coefficients are calculated. Finally the overall deformation of the worktable and the base is solved by taking a temperature field and a pressure field of an oil film as body loads.

Description

technical field [0001] The invention relates to a method for researching thermal characteristics of a static pressure rotary table under extreme working conditions, in particular to a method for calculating thermal deformation of a static pressure rotary table with double rectangular cavities under extreme working conditions. Background technique [0002] Due to the advantages of low power consumption, long life, stable operation and high precision, the hydrostatic rotary table has become the core component of large-scale CNC equipment. In recent years, with the continuous advancement of science and technology, higher and higher requirements have been put forward for the machining accuracy, machining size, machining speed and carrying capacity of machine tools. However, under extreme working conditions, the thermal deformation of the static pressure rotary table is obvious, because the heat generated by the oil film increases greatly under extreme working conditions, which w...

AI Technical Summary

Problems solved by technology

However, under extreme working conditions, the thermal deformation of the static pressure rotary table is obvious, because the heat generated by the oil film increases greatly under extreme working conditions, which will lead to uneven temperature changes of the workbench, which will cause thermal deformation of the workbench

In addition, the convective heat transfer of the static pressure rotary table is different under different extreme working conditions, which further leads to uneven deformation of the table

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