Method for calculating convective heat transfer coefficient of hydrostatic bearing rotating workbench

Abstract

The invention provides a method for calculating a convective heat transfer coefficient of a hydrostatic bearing rotating workbench. The calculation of the convective heat transfer coefficient of the rotating workbench can be divided into calculation of an upper surface and a side surface, the calculation of convective heat transfer coefficients of the upper surface can be compared to the fluid flowing through a horizontal plate, and the calculation of convective heat transfer coefficients of the side surface can be compared to the fluid transversely flowing through a vertical flat wall. An area tripartite method is proposed to calculate the convective heat transfer coefficients of each part on the upper surface of the rotating workbench. Since the radius of the rotating workbench is larger, the difference of heat emission coefficients at different positions are larger at the same rotational speed, so that the upper surface of the rotating workbench is divided into three parts, finallythe average value is obtained, and the calculated average value is used as the convective heat transfer coefficient of the rotating workbench.

Description

technical field [0001] The invention relates to a method for calculating the convective heat transfer coefficient of a static pressure supported rotary workbench, in particular to a method for calculating the convective heat transfer coefficient of a static pressure supported rotary workbench with double rectangular cavities. 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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