Hydrostatic guideway bearing capacity analyzing method considering guideway surface deformation

Abstract

The invention provides a hydrostatic guideway bearing capacity analyzing method considering guideway surface deformation and belongs to the field of supporting and lubricating. The analyzing method is provided for solving the problem that the bearing capacity of a hydrostatic guideway is affected due to the fact that the upper bearing surface and the lower bearing surface of the hydrostatic guideway deform under the effect of oil pressure. According to the hydrostatic guideway bearing capacity analyzing method considering guideway surface deformation, based on the Reynolds equation, pressure intensity distribution inside an oil cushion is obtained after the Reynolds equation is simplified, and deformation distribution of the guideway is obtained by introducing a one-dimensional elastic body balance differential equation. In the obtaining process, the differential equation is converted into a difference equation according to the finite difference method, and obtaining is accelerated through Gauss-Seidel iteration and primary and secondary super-relaxation iteration. Firstly, the Reynolds equation is solved, so that the pressure intensity distribution of oil is obtained, and the pressure intensity is taken as the external force condition to be substituted into the elastic body balance differential equation, so that deformation of the guideway below the oil cushion is obtained. The deformation is taken as the oil film thickness change condition to be substituted into the Reynolds equation, so that more accurate pressure intensity distribution is obtained. Loop iteration is conducted till a calculation result meets the precision requirement, and the change of the bearing capacity is analyzed according to the calculation result.

Description

technical field [0001] The invention relates to a method for analyzing the carrying capacity of a static pressure guide rail considering the deformation of the guide rail surface, and belongs to the technical field of support and lubrication analysis. Background technique [0002] The hydrostatic support system has been widely used in the support and lubrication system of machine tools, especially in large and heavy-duty machine tools. The static pressure support system provides pressure oil to the oil pad at the bearing position through the external oil supply system, and the pressure oil flows between the two bearing surfaces to form a static pressure effect, which separates the two bearing surfaces and realizes the bearing capacity. The oil pad can be roughly divided into two parts: the oil pocket and the oil sealing edge. The pressure of the pressure oil in the oil pocket is equal to the pressure provided by the external oil supply system. At the oil seal edge, the vis...

AI Technical Summary

Problems solved by technology

However, in large-scale machine tools, under the pressure of the supporting oil, the upper and lower bearing surfaces will inevitably produce certain deformations, and the deformations will affect the pressure distribution in the oil pad, thereby affecting the bearing capacity.

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