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A method for detection and evaluation of compound position error of spherical hole system

A composite position degree and spherical hole technology, applied in the direction of measuring devices, mechanical measuring devices, mechanical devices, etc., can solve the problems of difficulty in manufacturing, low yield rate, difficulty in ensuring process accuracy, etc., to achieve reduced evaluation errors, high precision, The effect of simple data processing methods

Active Publication Date: 2019-03-05
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the difficulty of manufacturing the spherical hole system, it is difficult to guarantee the process accuracy and the yield rate is low, so the inspection has become a necessary link to ensure the working performance of the parts

Method used

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  • A method for detection and evaluation of compound position error of spherical hole system
  • A method for detection and evaluation of compound position error of spherical hole system
  • A method for detection and evaluation of compound position error of spherical hole system

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Embodiment 1

[0030] In order to make up for the shortcomings of the existing method for detecting and evaluating the compound position degree of the spherical pore system, the embodiment of the present invention establishes an error model for the compound position degree of the spherical pore system, and uses a three-coordinate measuring machine as the basic detection instrument to propose a method of coincidence through rotation , which realizes the simple measurement and evaluation of the composite position degree of the spherical pore system, see the following description for details:

[0031] 101: Use a three-coordinate measuring machine to obtain measurement data, that is, point coordinates on multiple sections of each hole;

[0032] 102: Process the measurement data: first, solve the center of each section according to the data points on multiple sections in each hole; then solve the fitting axis of each hole according to the center of the section, and calculate the position of each h...

Embodiment 2

[0039] The scheme in embodiment 1 is introduced in detail below in conjunction with specific description drawings and calculation formulas, see the following description for details:

[0040] 201: Detect object

[0041] Among them, the spherical hole system targeted by the embodiments of the present invention is a manufacturing process and features of a group of holes on the spherical surface. like Figure 1a , 1b , 1c are respectively a three-dimensional schematic diagram and a two-dimensional diagram of a part with spherical pores.

[0042] 202: error to be checked;

[0043] The detection and evaluation error item in the embodiment of the present invention is the compound position degree error of the pore system on the spherical surface, which belongs to the compound position degree error category of group features.

[0044] In ASME-14.5 2009 (American Society of Mechanical Engineers Standard), the compound position degree of group features is defined as follows: The comp...

Embodiment 3

[0087] Combined with the specific calculation formula, the solution method of the minimum containing cylinder is given below, see the description below for details:

[0088] The relative position error of the hole group has a position requirement related to the A datum. In order to ensure the position degree requirement with the datum A, the axis of the smallest containing cylinder is perpendicular to the Z axis, and the direction vector of the axis is expressed as (0,0,1). So the points on the fitted axis after the fitting translation and rotation Projection point projected on the XOY plane Converted to solving the smallest enclosing circle, r max Expressed as the radius of the smallest enclosing circle. Therefore, the minimum enclosing circle is very important to ensure the accuracy of the algorithm and the accuracy of the solution. The embodiment of the present invention uses the particle swarm algorithm to accurately and quickly solve the minimum enclosing circle of t...

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Abstract

The invention discloses a method for detecting and evaluating a spherical hole composite location degree error, which comprises the steps of respectively calculating the distance between upper and lower limit points on a fitting axis of each hole and an ideal axis, acquiring the maximum distance, and enabling the maximum distance to be multiplied by 2 so as to act as a first error result of the composite location degree error, that is, an absolute location degree error; and acquiring the location of a minimum containing cylinder, sequentially calculating the distance between actual coordinates of all measuring points to an axis of the minimum containing cylinder, finding out the axis location of the minimum containing cylinder through an optimization algorithm, enabling the maximum distance between all of the points to the axis of the minimum containing cylinder to be the minimum, enabling the maximum distance to be multiplied by 2 so as to act as a second error result of the composite location error, that is, a relative location degree error. The method disclosed by the invention solves a problem that a plurality of space variables exist in solving the spherical hole composite location degree error; a relative location degree error between hole groups and a location degree error of each hole relative to the reference in the spherical hole composite location degree can be accurately solved; and an evaluation error in the detection process can be reduced.

Description

technical field [0001] The invention relates to the field of geometric error detection and evaluation, in particular to a method for detection and evaluation of compound position error of a spherical hole system. Background technique [0002] Spherical hole system is a manufacturing process and feature with groups of holes on the spherical surface, which is widely used in parts in the aerospace field. Parts used in aerospace often have important requirements for precision. Due to the difficulty of manufacturing the spherical hole system, it is difficult to guarantee the process accuracy and the yield rate is low, so the inspection has become a necessary link to ensure the working performance of the parts. The detection method of the position degree between the holes of the spherical hole system and the position degree of the hole to other features is the main feature of the present invention. Contents of the invention [0003] The invention provides a method for detectin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01B5/14
CPCG01B5/14G01B5/143
Inventor 何改云黄鑫郭龙真桑一村黄灿
Owner TIANJIN UNIV
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