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Cambered surface gloss uniformity detection method

A detection method and uniformity technology, applied in the detection field, can solve the problems of insufficient scientificity of measurement data, misjudgment of detection results, and range limitation, etc., and achieve the effect of not being easily affected by subjective, high detection efficiency, and improved accuracy

Pending Publication Date: 2021-05-07
HUAQIAO UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

About roughness detection: for the curved surface with large curvature, it cannot be measured due to the limitation of the range of the roughness meter
About glossiness detection: The glossiness measurement of the curved surface basically adopts the measurement method of the hand-held glossmeter. reflection, which leads to inaccurate measurement results; moreover, single-point measurement is used in the measurement, which leads to insufficient scientificity of the measurement data
[0004] Therefore, for some arc-shaped workpieces with large curvature or special shapes, the surface quality is manually inspected, which has the following disadvantages: First, manual inspection is easily affected by subjectivity, and different workers may have inconsistent inspection results on the same workpiece. Human factors may misjudge the test results; second, manual testing is inefficient and expensive

Method used

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  • Cambered surface gloss uniformity detection method
  • Cambered surface gloss uniformity detection method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] A method for detecting the gloss uniformity of a curved surface, comprising:

[0035] S1, please refer to figure 1 , select the arc track 2 parallel to the arc surface to be detected at an interval of 1 radian, the arc track 2 is equipped with a camera clamping device 3, the camera clamping device 3 is equipped with a camera, and the camera clamping device 3 and the camera can be mounted together Move along the arc track 2, fix the arc track 2 so that the arc surface 1 to be detected and the arc track 2 are spaced in parallel; the camera includes a camera lens 31, a ring light source 32, a data acquisition system and a screen; the ring light source is clamped on On the camera lens, the ring light source and the camera lens are arranged radially along the arc to face the arc surface to be detected; the data acquisition system connects the camera lens and the screen through the data line, so that the pictures taken by the camera lens can be viewed in real time through the...

Embodiment 2

[0051] It differs from Embodiment 1 in that: through processing, a binary image such as Figure 8 shown.

[0052] Such as Figure 9 As shown, along the detection direction, take continuous areas with an area of ​​3 mm × 3 mm for statistics on the proportion of black pixels, and the proportion of black pixels in the 8 areas can be obtained as follows:

[0053]a1=11433÷(620×620)=2.97%;

[0054] a2=13237÷(620×620)=3.44%;

[0055] a3=29336÷(620×620)=7.63%;

[0056] a4=17130÷(620×620)=4.46%;

[0057] a5=10038÷(620×620)=2.61%;

[0058] a6=3951÷(620×620)=1.03%;

[0059] The maximum fluctuation range of the data is 7.63%-1.03%=6.6%>5%, indicating that the data fluctuates greatly, and the surface of the arc is uneven.

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Abstract

The invention discloses a cambered surface gloss uniformity detection method. The method comprises the following steps: selecting an arc-shaped track for parallelly spacing the radian of a to-be-detected cambered surface, installing and connecting a camera clamping device on the arc-shaped track, and clamping a camera on the camera clamping device; arranging a label with scales at the edge of a to-be-detected area of the to-be-detected cambered surface, wherein the scale direction of the label is parallel to the radian of the to-be-detected cambered surface, and the scales of the label are located at the edge of a camera shooting area; enabling the camera to move along the arc-shaped track, and shooting one picture when the camera moves by a preset stroke in the moving process; taking the scale of the label as a reference, and splicing the shot pictures to obtain a cambered surface expanded drawing; carrying out gray processing on the cambered surface expansion drawing to obtain a gray matrix and a gray picture; setting a threshold value n, and retrieving each gray value in the gray matrix to obtain a binary image; and taking a certain area to carry out black pixel point proportion statistics, and determining the surface gloss distribution uniformity according to the proportion statistics. The method has the advantages of accurate and scientific result and low cost.

Description

technical field [0001] The invention relates to the technical field of detection methods, in particular to a method for detecting the uniformity of gloss on a curved surface. Background technique [0002] Arc workpieces are widely used, such as metal arc workpieces, stone arc workpieces, etc. Common arc-shaped workpieces of metal parts such as bearing shells, cylindrical surfaces and special arc surfaces, etc., and common arc-shaped workpieces of stone materials such as Roman columns, marble railings, curved panels for decoration and marble stools, etc. [0003] In the traditional curved surface quality uniformity detection of curved workpieces, the detection index is the roughness and gloss of the curved surface. About roughness detection: for the curved surface with large curvature, it cannot be measured due to the limitation of the range of the roughness meter. About glossiness detection: The glossiness measurement of the curved surface basically adopts the measurement ...

Claims

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Application Information

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IPC IPC(8): G01N21/89
CPCG01N21/89
Inventor 陆静申云黄身桂
Owner HUAQIAO UNIVERSITY
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