JPH0827181B2 - Automatic coating skin inspection device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a coating skin automatic inspection device for automatically determining the quality of the coating surface state of an object to be coated such as an automobile conveyed in a line. is there.

[Conventional technology]

Conventionally, the unevenness present on such a coated surface in a factory,
In particular, when judging the quality of the yuzu skin condition, as shown in FIG. 6, for example, fluorescent lights are arranged above or on the side of the hood surface 30 of the automobile, and diffuse reflection is caused at the edge of the illumination area of the image 32 of the fluorescent lights. The fluctuation of the image generated due to the wavelength of about 2 to 6 mm, that is, the degree of distortion was judged by the inspector visually comparing the adjacent images 31 and 33 on the reference plate 34 with each other visually.

[Problems to be Solved by the Invention]

Therefore, the determination result is likely to vary, requires skill, and requires inspection time.

Therefore, it is an object of the present invention to provide an automatic coating skin inspection device for automatically determining the degree of occurrence of the coating skin of a material to be coated conveyed in a factory, especially the state of the orange peel skin.

[Means for solving the problem]

In order to achieve this object, the present invention, as shown in FIG. 1 and FIG. 2, has a coated object detection sensor 2 for detecting the carry-in of the coated object 1 to a predetermined position along a line, A slider 3 which is driven to move in and out in response to a distance detection signal is arranged so as to have a predetermined distance from the inspection surface 1a of the object to be coated 1. The slider 3 has a distance sensor 4 that measures the distance to the inspection surface 1a and outputs a distance detection signal.
A surface emitting body 5 that illuminates the inspection surface 1a, and an image sensor 6 that captures an illumination area of the surface emitting body are provided.
Further, when the slider 3 is positioned at a predetermined distance, the image memory means 7 for storing the image signal output from the image sensor 6 at the address of the position corresponding to the illumination area, and the image signal stored or stored. about,
Binarized image data creating means 7a for binarizing depending on whether or not an intermediate level between image signal levels corresponding to the illuminated and non-illuminated areas is exceeded, and a reference line address along the edge of the illuminated area where distortion occurs. The number of addresses B up to the address position where the binary image data is inverted with respect to A is the reference line address A
Along with the data generating means 8 for generating distorted waveform data, frequency analyzing means 9 for frequency-analyzing the generated distorted waveform data, and frequency-analyzed frequency components in each of the yuzu skin frequency regions D. There are provided a summing means 10 for calculating the total value of the power E of the frequency component and a judging means 11 for comparing the calculated total value with a reference value to judge the quality of the applied skin.

The position of the reference line address A may be set in a non-illuminated area, that is, a black area in FIG. 2A, or both edges may be measured. The binarized image data creating means 7a is placed in front of or behind the image memory means 7, and the distortion data creating means 8 is provided.
The binarization process may be performed before the process of.

[Action]

When the object to be coated 1 is conveyed to a predetermined position, the object to be coated detection sensor 2 detects the loading thereof, and the slider 3 is driven to move toward and away from the inspection surface 1a so as to come to the predetermined position. The image sensor 6 captures an image of the inspection surface 1a at a predetermined distance and stores it in the image memory means 7. The distortion data creating means 8 sequentially detects the number of addresses B up to the address position where the binary image data for the reference line address A is inverted along the reference line address A, and creates the distortion waveform data C. The frequency analysis means 9 frequency-analyzes this distorted waveform data C to detect power data F with respect to a frequency change, as shown in FIG. 2c. Then, in order to collate with the frequency analysis data G of the standard coating surface, the power E for each frequency component of the frequency region D corresponding to the orange peel region is summed. The judging means 11 compares the total value with a reference value of a permissible limit set in advance corresponding to the total value of the standard frequency analysis data G, and when it exceeds, the yuzu skin condition is bad, and when it falls below. Yuzu skin condition is judged to be good.

Example of Invention

FIG. 3 shows the structure of an automatic coating skin inspection apparatus according to an embodiment of the present invention.

At a predetermined position in the transportation path of the automobile 39, a photoelectric tube 12,1 as an object detection sensor for detecting the loading is detected.
2a are arranged facing each other. A biaxial slider 13 is disposed slightly above the phototubes 12 and 12a in the rearward direction with respect to the transport direction H so as to come into contact with the inspection surface 39a by vertical movement.

The horizontal bar 13b of the slider meshes with, for example, a threaded rod in a column 13c via a nut, and a slider control drive circuit 13a is attached to this threaded rod so that the distance detection signal a reaches a predetermined distance signal. It can be slid up or down. Further, on the horizontal bar 13b, an elongated fluorescent lamp 15 that illuminates the inspection surface 39a from above vertically, and similarly, from the vertically above, the inspection surface 39a is imaged extra in the front-rear direction and partially in the vehicle width direction. As image sensor, for example, focal length 50mm
A TV camera 16 of a certain degree and, for example, an ultrasonic distance sensor 14 are attached.

That is, the slider control drive circuit 13a is configured to detect the distance detection signal a
Is input, the horizontal bar 13b is moved upward so that the separation distance between the inspection surfaces 39a reaches a predetermined distance within the range of 1 to 2 m, and the stard signal b is also sent when the separation / contact driving is completed.

The comparator 18a exceeds the level of the image signal c at both edges of the illumination area 39b of the fluorescent lamp on the inspection surface 39a, as shown in FIG. And an H level “1”, and an L level “0” signal if not exceeded. The image memory 18
It has a storage capacity of 512 × 512 addresses, responds to the generation of the start signal b, and outputs the binarized output signal of the comparator 18a in synchronization with the read scan of the TV camera 16 to the illumination area 39b and its vicinity. Are taken in as binary image data of the corresponding position of.

Reference numeral 20 denotes a computer composed of a microcomputer or a personal computer, which is composed of a CPU 21, a program memory 22 and a RAM 23, and operates according to the flow chart shown in FIG. , Frequency analysis means 9, summing means
10 and determining means 11 are configured.

That is, as shown in FIG. 4, the CPU 21 sets the address 40 of the inversion position from the H level to the L level generated at the vertical edge portion of the illumination area 39b to the reference line address Y ₁ of the L level area.
, And the number of addresses ΔX ₁ and ΔX ₂ up to the reverse address 40 in the reading scanning direction for Y ₂ and the reference line address Y ₁ , respectively.
Distorted waveform data is created by detecting each scanning line along Y ₂ (in the figure, the black region at the L level shows only the edge portion). Further, the distorted waveform data is Fourier transformed to analyze the frequency components, and the power corresponding to each frequency component, that is, the frequency component level is detected. Furthermore, the power of the frequency domain for the orange peel skin is detected for the distortion waveform data of both edges, and the powers of the domains are summed. Furthermore, by comparing with the total value of the corresponding power of the standard coating surface stored in advance, both total values do not exceed the standard total value.
A signal is output, and an NG signal is output if the sum of one or both exceeds.

The display 24 and the buzzer 25 are output means, and the display 24 is
The buzzer 25 sounds in response to the NG signal while displaying OK or NG in response to the OK or NG signal.

The operation of the skin-applying device thus configured is as follows.

When the automobile 39 is carried in the line in the transport direction H and the photoelectric light 12, 12a detects the light interruption at a predetermined position, a coating object detection signal is sent to the slider control drive circuit 13a. As a result, when the separation distance detected by the distance sensor 14 differs from the reference separation distance depending on the vehicle type, the horizontal bar 13b moves up or down until the difference disappears. The slider control drive circuit 13a sends a start signal b to the computer 20 at the time when this separation / contact drive ends. As a result, the image memory 18 sequentially binarizes the image data c of the illumination area 39b and stores it at high speed. The computer 20 performs the data processing of FIG. 5 to detect the fluctuation of the binarized data of the illumination area 39b with respect to the reference line addresses Y ₁ and Y ₂ , and performs the frequency analysis of the fluctuation, that is, the distorted waveform data. . As a result, it is possible to know how much power of the frequency component in the yuzu skin region is present, the quality is judged according to the amount, and the judgment result is output to the display unit 24. The defect is also notified by the buzzer 25.

In the above-described embodiment, the measurement area may be set at a plurality of places on the automobile 39, or the slider may be brought into contact with or separated from the side face of the automobile to inspect the coated skin on the side face.

〔The invention's effect〕

As described above, according to the present invention, it is possible to automate the inspection of the orange-colored skin of the coated surface in the factory line, the variation of the evaluation hardly occurs, and the inspection time is shortened.

[Brief description of drawings]

FIG. 1 is a diagram showing the configuration of an automatic coating skin inspection device of the present invention,
2 is a diagram for explaining the operation of FIG. 1, FIG. 3 is a diagram showing a configuration of an automatic coating skin inspection device according to an embodiment of the present invention, and FIG. 4 is a diagram for explaining the operation of the same embodiment, FIG. 5 is a flow chart for explaining the operation of the computer of the same embodiment, and FIG. 6 is a diagram for explaining a conventional method for inspecting painted skin. 1 ... Painted object, 2 ... Painted object detection sensor, 3,13 ...
Slider, 4,14 Distance sensor, 5 Surface emitting element, 6
… Image sensor, 12, 12a …… Phototube, 15 …… Fluorescent lamp,
16 ... TV camera.

Claims (1)

[Claims] 1. An object-to-be-detected sensor for detecting the carry-in of the object-to-be-coated to a predetermined position along a line along which the object-to-be-coated is conveyed, and a predetermined surface for an inspection surface of the object-to-be-coated. A slider, which is driven to separate and contact in response to a distance detection signal so as to be a separation distance, is arranged, and a distance sensor that measures the separation distance to the inspection surface and outputs the distance detection signal to the slider. A surface light emitter that certifies the inspection surface and an image sensor that captures an illumination area by the surface light emitter, and an image output by the image sensor when the slider is positioned at the predetermined distance Image memory means for storing a signal at an address of a position corresponding to the illuminated area; and for the image signal stored or stored in the image memory means, the illuminated and non-illuminated Binarized image data creating means for binarizing depending on whether or not the intermediate level of the image signal level corresponding to the region is exceeded, and the above-mentioned 2 for the reference line address along the distorted edge of the illumination region. Distortion data creating means for creating the distortion waveform data by sequentially counting the number of addresses up to the address position where the valued image data is inverted along the reference line address, and a frequency for performing frequency analysis of the created distortion waveform data. Analyzing means, summing means for calculating the total value of the power of each frequency component in the frequency domain signal subjected to frequency analysis in the yuzu skin frequency domain, and comparing the calculated total value with a reference value to determine the quality of the painted skin. A device for automatically inspecting painted skin, comprising: a judging means for judging.