On-line Measuring Method of Diameter of Shaft Parts Using Conic Invariants

A technology for quadratic curves and shaft parts, applied to measuring devices, optical devices, instruments, etc., to achieve high measurement accuracy, high measurement speed, and correction of distortion

Active Publication Date: 2019-12-03
JILIN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, shaft parts are three-dimensional entities, and the surface of the object where the measurement size is located is no longer an imaging plane, so the measurement method for two-dimensional dimensions is no longer applicable
Moreover, since the reference size of the measured part is often tens to hundreds of millimeters, which is much larger than the size of the camera lens, at this time, the machine vision measurement method is no longer applicable

Method used

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  • On-line Measuring Method of Diameter of Shaft Parts Using Conic Invariants
  • On-line Measuring Method of Diameter of Shaft Parts Using Conic Invariants
  • On-line Measuring Method of Diameter of Shaft Parts Using Conic Invariants

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Embodiment Construction

[0040] see Figure 1 to Figure 6 Shown:

[0041] The on-line measurement method for the diameter of shaft parts using the quadratic curve invariant provided by the present invention is as follows:

[0042] Step 1. Calibrate the internal parameters and distortion coefficients of the CCD camera. Based on the camera plane calibration algorithm proposed by Zhang Zhengyou, use the high-precision calibration board to calibrate the corner coordinates of the images in different postures to calibrate the internal parameters of the camera and the distortion coefficient of the lens. The specific process includes Follow these steps:

[0043] 1) Using the CCD camera 7 to collect nine images of the calibration board in different attitudes. When collecting images, the positional relationship between the backlight 1, the calibration plate 2 and the CCD camera 7 is as follows: figure 1 As shown, the nine calibration board images collected are as follows: Figure 4 shown;

[0044] 2), usin...

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Abstract

The invention discloses a shaft component diameter size online measurement method using a quadratic curve invariant. The method comprises the steps that step one, the internal parameters and the distortion coefficient of a CCD camera are calibrated; step two, line structured light plane and top connecting line parameters are calibrated; step three, fitting of the perspective projection ellipticalequation is performed; and step four, the shaft diameter size of the measured shaft is calculated. The beneficial effects are that only the relative position relationship between the CCD camera and the laser requires to be maintained when the measurement method is used so as to further facilitate practical application; and the structured light visual measurement technology is used so that online noncontact measurement can be realized, the high measurement accuracy and measurement speed can be guaranteed, and the measurement accuracy can be less than or equal to + / -0.01mm for the shaft component of which the length is less than 200mm. Online noncontact measurement can be realized, the high measurement accuracy and measurement speed can be guaranteed, and the measurement accuracy can be lessthan or equal to + / -0.01mm for the shaft component of which the length is less than 200mm.

Description

technical field [0001] The invention relates to an online measuring method for the diameter of shaft parts, in particular to an online measuring method for the diameter of shaft parts using quadratic curve invariants. Background technique [0002] At present, the shaft is one of the important parts that make up the machine. It is mainly used to support the rotating mechanical parts and transmit motion and power. The shaft parts are widely used in many mechanical devices, including automobile gearboxes, engines, machine tools spindle etc. With the rapid development of modern technology, the requirements for the operating speed and transmission accuracy of the device are getting higher and higher, so the manufacturing accuracy and working performance of the shaft will directly affect the use status and service life of the machine. [0003] The measurement of the shaft diameter in traditional machining is mostly contact measurement, mainly using vernier calipers, screw microme...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01B11/08
CPCG01B11/08
Inventor 谭庆昌寇莹刘思远张龙飞原敏乔李先报邵天池
Owner JILIN UNIV
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