Method for extracting line-to-line perpendicularity error of mechanical structure

Abstract

The embodiment of the invention discloses a method for extracting a line-to-line perpendicularity error of a mechanical structure. The perpendicularity error of a side line or an axis to a reference axis can be extracted based on deformation data of a structural part of a finite element model. The method comprises the steps that a straight line equation of a reference axis 1 in the finite elementmodel after a valve is deformed is measured in infinite element software, a point A is selected on the side line or the axis to be measured of a normal vector tau, and the coordinate of the point A isqueried; according to the coordinate of the point A and the normal vector tau of the reference axis, a plane equation pi is determined; the distances between other points on the side line or the axisto be measured and the plane are calculated and divided into two types, one type is larger zero, the other type is smaller than zero, the sum of the absolute values of the positive maximum value andthe negative minimum value is denoted as the formula f=|li|max+|lj|max, li is larger than or equal to zero, lf is smaller than zero, and f is used as the line-to-line perpendicularity error.

Description

technical field [0001] The invention relates to the technical field of extracting structural line-to-line perpendicularity errors, in particular to a method for extracting mechanical structural line-to-line perpendicularity errors. Background technique [0002] The line-to-line perpendicularity of high-precision mechanical product parts is one of the important quality indicators 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 and interchangeability of this part, the squareness error should be detected according to the line-to-line squareness tolerance given by the design. [0003] The error detection of line-to-line perpendicularity of existing mechanical products is mainly realized by mechanical detection, and there are mainly the following problems: 1. The existing methods are mainly aimed at the detection of line-to-line perpendicularity errors of ...

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Problems solved by technology

[0003] The error detection of line-to-line perpendicularity of existing mechanical products is mainly realized by mechanical detection, and there are mainly the following problems: 1. The existing methods are mainly aimed at the detection of line-to-line perpendicularity errors of actual mechanical products, which require mechanical product processing The line-to-line squareness error data can only be detected and obtained after it is manufactured; 2. When the mechanical product is assembled and is in a composite working condition, it is impossible to use the existing method to detect the line-to-line squareness error, that is, the existing The method can only detect the influence of manufacturing errors on the line-to-line perpendicularity of mechanical products, but cannot detect the effect of structural deformation of mechanical products on the line-to-line perpendicularity under actual working conditions such as temperature, air pressure, external load, and vibration environment. Impact

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