Method for extracting flatness errors of mechanical structural plane based on finite element analysis

Abstract

The invention provides a method for extracting the flatness errors of a mechanical structural plane based on finite element analysis. First, a three-dimensional solid model of a valve is built with the CAD technology, and simulated analysis under composite working conditions is carried out on the three-dimensional solid model through finite element software to measure and obtain the coordinates of all nodes of a deformed valve seat plane; space analytic geometry knowledge is utilized and a certain assessment method is combined to determine the position of an assessment basal plane (namely an ideal plane) of the valve seat plane so as to enable the maximum variations from all the nodes of the valve seat plane to the assessment basal plane to be smallest; the distance from each node of the valve seat plane to the assessment basal plane is calculated to obtain a high pole and a low pole and finally obtain the flatness errors. The method for extracting the flatness errors of the mechanical structural plane based on the finite element analysis has the advantages that the flatness errors can be extracted from the result of the finite element analysis of mechanical products including the valve and the like, whether the flatness errors meet requirements of graph paper is detected so as to judge out effects on performance such as sealing performance caused by deformation of the valve under the composite working conditions.

Description

technical field [0001] The invention relates to the technical field of valve parameter measurement, in particular to a method for extracting flatness errors of mechanical structure planes based on finite element analysis. Background technique [0002] The flatness of mechanical parts such as valves is a main quality index of the part, which affects the interchangeability and quality of the part, and then also affects the quality of the entire mechanical product. In order to ensure the quality of the valve and the interchangeability of the valve, the flatness error should be detected according to the flatness tolerance given by the design. [0003] The strength and stiffness analysis of valves under composite working conditions has always been a difficult point in valve design. In order to judge the sealing performance of the valve, it is necessary to analyze the influence of the stress distribution and deformation of the valve on the flatness of the valve seat plane under t...

AI Technical Summary

Problems solved by technology

[0005] There are mainly the following problems in the current error detection method for the flatness of mechanical products such as valves: 1. The existing methods are mainly aimed at the flatness error detection of actual mechanical products, and the flatness error can only be detected after the mechanical products such as valves are processed and manufactured. Data; 2. When mechanical products such as valves are assembled and are in complex working conditions, it is impossible to detect flatness errors using existing methods, that is, existing methods can only detect the flatness of mechanical products such as valves due to processing and manufacturing errors. However, it is impossible to detect the influence of the deformation of mechanical products such as valves on their flatness under compound working conditions such as temperature, air pressure, installation external load, and vibration environment.

Images