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Optical detection method for perpendicularity of nail hole

An optical detection and verticality technology, applied in the direction of using optical devices, measuring devices, instruments, etc., can solve the problems of inability to detect the size of the tooling, low detection efficiency, low detection accuracy, etc., and achieve online automatic detection. The effect of high detection accuracy

Active Publication Date: 2020-07-31
CHENGDU AIRCRAFT INDUSTRY GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] 1) The detection accuracy is low. Since the "T" standard tooling needs to be inserted into the hole, there is a certain gap; the feeler gauge needs to be inserted into the "T" standard tooling, and the outermost dimension of the tooling cannot be detected. The thickness H of the feeler gauge is different from the "T" "There is a certain difference in the actual height of the standard tooling
Therefore, these problem detection methods will introduce systematic errors and cannot accurately measure the verticality of the rivet holes;
[0007] 2) The detection efficiency is low. Each hole needs to be inspected with "T" standard tooling, and the inverse trigonometric function calculation is performed manually to obtain the measurement results, which is inefficient
[0008] 3) Since the "T" standard tooling is inconvenient to be directly loaded on the robot or mechanical arm, it is difficult to realize automatic detection

Method used

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  • Optical detection method for perpendicularity of nail hole
  • Optical detection method for perpendicularity of nail hole
  • Optical detection method for perpendicularity of nail hole

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Experimental program
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Effect test

Embodiment 1

[0029] A kind of optical detection method of nail hole perpendicularity of the present invention, the steps are:

[0030] S1 uses a light source that emits parallel light, so that the light source is kept perpendicular to the plane of the nail hole plate, and the diameter of the spot is larger than the diameter of the nail hole. The parallel light source is a parallel laser generated by a two-dimensional projector;

[0031] S2 injects parallel light from one end of the nail hole along the normal direction of the nail hole plate plane;

[0032] S3 Install a parallel light receiving device at the exit of the nail hole to obtain the light spot at the exit of the nail hole;

[0033] If the nail hole is perpendicular to the plane of the nail hole plate, the light spot is circular;

[0034] If the nail hole is not perpendicular to the plane of the nail hole plate, the light spot is elliptical, and the short diameter a and long diameter b of the light spot are measured;

[0035] S4...

Embodiment 2

[0039] In order to improve the accuracy and efficiency of aircraft nail hole verticality detection and realize the automatic detection of nail hole verticality, the following nail hole verticality detection method is adopted:

[0040] 1) Use such as figure 2 For the parallel laser generated by the selected parallel light sensor such as a two-dimensional projector, the parallel laser light source emitter should be kept perpendicular to the nail hole plane, and the spot diameter should be larger than the nail hole diameter.

[0041] 2) Inject from one end of the nail hole along the normal direction of the nail hole plane;

[0042] 3) If the nail hole is completely perpendicular to the plane, according to the characteristics of the parallel laser, a circular spot consistent with the nail hole will be formed at the exit of the nail hole, such as figure 2 ;

[0043] 4) If the nail hole is not perpendicular to the oblique hole on the plane, according to the characteristics of th...

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Abstract

The invention discloses an optical detection method for the perpendicularity of a nail hole. The method comprises the following steps: enabling parallel light to be perpendicular to the plane of a nail hole plate and to enter from one end of the nail hole; arranging a parallel light receiving device at a nail hole outlet to obtain light spots at the nail hole outlet; if the nail hole is perpendicular to the plane of the nail hole plate, allowing the light spots to be circular; if the nail hole is not perpendicular to the plane of the nail hole plate, allowing the light spots to be oval, and measuring to obtain a short diameter a and a long diameter b of the oval light spots; measuring the thickness delta of the nail hole plate, and obtaining the perpendicularity of the nail hole through the long diameter and the short diameter of the oval light spots; if the numerical value of the angle alpha is within a preset range, judging that the perpendicularity of the nail hole is qualified; orotherwise, judging that the perpendicularity of the nail hole is disqualified. The optical detection method has the advantages of high detection precision, high detection speed, conversion into a digital signal and realization of on-line automatic detection.

Description

technical field [0001] The invention relates to a detection method for detecting the verticality of nail holes based on an optical method, in particular, it can improve the accuracy of the verticality of nail holes and can be used for automatic online detection of nail holes. Background technique [0002] Aircraft digital assembly is the process of using computer technology and digital control technology to realize automatic clamping, hole making and connection to complete the entire assembly task. During the assembly process of large parts of the aircraft, a large number of connecting holes need to be prefabricated. Generally, there are more than 1.5 million connecting holes in large civil aircraft. Rivets, rivets, screws or high locks are mostly used for the connecting parts. These holes are hereinafter referred to as nail holes. [0003] The verticality of the nail hole refers to the degree of consistency between the center line connecting the nail hole and the normal lin...

Claims

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Application Information

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IPC IPC(8): G01B11/26
CPCG01B11/26
Inventor 邓晓春高双徐龙郑发路
Owner CHENGDU AIRCRAFT INDUSTRY GROUP