JP3023890B2 - Tooth contact measuring machine - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a tooth contact measuring device that measures the tooth contact of a gear by image processing.

(Prior art) A color check method using vermilion Komeitan has been conventionally used for measuring the gear tooth contact, but since this method requires a great deal of labor and labor, it is necessary to check all gear teeth. It was practically impossible to make a tooth contact measurement.

Therefore, a method has been adopted in which an image of the tooth surface of the gear is read using a black-and-white camera, and the read image is binarized at an appropriate level to display the shade of the gear.

(Problems to be Solved by the Invention) However, in the above-mentioned conventional method, although the boundary of the tooth contact can be identified, the strength of the tooth contact cannot be identified.

Further, in the conventional method, when an object (gear) is identified by the luminance of monochromatic light, binarization cannot be identified depending on the combination of the color and luminance of the object. It was necessary to pay close attention to the intensity and direction of the light.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and an object of the present invention is to provide a tooth contact measuring device which can easily and quickly display the boundary and strength of tooth contact for all gear teeth. is there.

(Means for Solving the Problems) In order to achieve the above object, the present invention provides a tooth for measuring the tooth contact of a gear after a tooth surface coated with paint is once meshed with a mating gear not coated with paint. Driving means for indexing and rotating the set gears one tooth at a time, illuminating means for irradiating light to the tooth surface of the gears, and displaying images of the gears as R (red), G (green), A color camera readable in B (blue) and an image read by the color camera
For each of the R, G, and B components, a binarization process is performed for each component at a threshold value that is optimal for the luminance of the component in that state, and the resulting binarized image is combined to display the grayscale of the image. Image processing means for performing
It is characterized by comprising a control means for controlling the operation of the image processing means and the like, and an output means for outputting a grayscale image of the tooth surface obtained by the image processing means.

(Function) According to the present invention, since the image of the tooth surface read by the color camera is binarized for each of the R, G, and B components, not only the boundary between the teeth but also the strength is displayed. More detailed data on tooth contact is obtained.

Further, since image processing for one tooth is performed instantaneously and the gears are automatically determined one by one by the driving means, the measurement of the tooth contact with respect to all the teeth is made very efficiently in a short time.

Furthermore, according to the present invention, it is not necessary to put the gear to be measured in a dark room, and image processing can be sufficiently performed even with rough natural light, so that measurement can be performed easily.

Embodiment An embodiment of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a configuration diagram of a tooth contact measuring device according to the present invention,
In the figure, W is a gear to be measured, which is set horizontally on a horizontally rotatable rotary table 1.
Note that this gear W is one in which vermilion Komeitan is applied to all the tooth surfaces, and is once meshed with a mating gear (not shown).

The rotary table 1 is rotated by a predetermined amount at a predetermined timing by a pulse motor 2, and the rotation of the pulse motor 2 is reduced by a worm speed reducer 3 at a fixed rate and transmitted to the rotary table 1. ing.

In FIG. 1, reference numeral 4 denotes an image of each tooth surface of the gear W set on the rotary table 1 as R (red), G (green), B (blue).
Is a color CCD camera that can be read by a robot, which is supported by a robot 5 whose posture is controlled.

Further, in the drawing, reference numeral 6 denotes an illumination device for irradiating white light toward the tooth surface of the gear W. An optical fiber 7 derived from the illumination device is connected to the color CCD camera 4, and the gear W It opens toward the tooth surface.

Incidentally, an image processing board 8 is connected to the color CCD camera 4, and an AV television 9 is connected to the image processing board 8. The image processing board 8 converts the image of the tooth surface read by the color CCD camera 4 for each of the R, G, and B components into a threshold value optimal for the luminance of the component in that state. The image processing is performed, and the grayscale display of the image is performed by combining the binary images obtained thereby, and the grayscale display of the image is displayed on the AV television 9 connected thereto.

Then, the image data processed by the image processing board 8 is transmitted to the computer 10, where it is stored,
The information is displayed on the CRT 11 or output to the color printer 12 connected thereto as necessary. The computer 10 controls the operation of the pulse motor 2, the color CCD camera 4, the robot 5, and the image processing board 8.

Next, the operation of the tooth contact measuring device will be described with reference to the flowchart shown in FIG.

At the time of measurement, the pulse motor 2 is stopped, the gear W on the rotary table 1 is stationary, and the tooth surface of the gear W is irradiated with white light from the illumination device 6 via the optical fiber 7.

The color CCD camera 4 receives an instruction from the computer 10 and reads, by R, G, B, an image of the tooth surface of the gear W on which the white light is irradiated (step 1 in FIG. 2), and reads this image. Send to the image processing board 8.

The image processing board 8 determines whether or not to perform the binarization processing of the R component of the transmitted image (step 2 in FIG. 2). If YES, the R component binarization processing is performed (step 2). 3) It is determined whether or not the next G component binarization process is to be performed (step 4). If NO, the process proceeds directly to step 4 without performing the R component binarization process.

If the determination in step 4 is YES, the G component is binarized (step 5), and it is determined whether the next B component is binarized (step 6). The processing directly proceeds to step 6 without performing the binarization processing of the G component.

Similarly, if the determination in step 6 is YES, the B component 2
A binarization process is performed (step 7), and in the next step 8, the binary image of each component obtained above is combined to obtain a grayscale display of the image. If NO, the binarization process of the B component is not performed. Proceeding to step 8, the remaining binary images of the R and G components are combined to obtain a gray-scale display of the image.

Here, the binarization processing of the components R, G, and B and the combination of the binary images obtained by these processing will be specifically described with reference to FIGS.

Generally, the hue of an image is represented by a combination of luminance (intensity) of three primary colors (R, G, B) of light.

For example, if the color of a red-based color image changes from the outside to the center, the shade of this color image is changed to the third.
Consider multilevel representation using contour lines as shown in FIG.

Assuming that the luminance (intensity) distributions of R, G, and B for the color image are as shown in FIGS. 3B, 3C, and 3D, respectively, the threshold values shown for the R, G, and B components are shown. 1,2,3
, A binary image 13 shown in FIG. 4A is obtained for the R component, a binary image 14 shown in FIG. 4B is obtained for the G component, and a B component is obtained for the B component. Gives a binary image 15 shown in FIG. 4 (c).

Thus, when the binary images 13, 14, and 15 are combined, an image shaded by contour lines shown in FIG. 3A is obtained, and regions a, b, and c divided by contour lines in the figure are obtained. , d become darker in this order.

The gray scale display of the tooth surface obtained by combining the binary images in step 8 of FIG. 2 is output to the CRT 11 of the AV television or the computer 10 (step 9) and, if necessary, to the color printer 12 (step 9). In step 10), the output result is determined (step 11). If the result is correct, the tooth contact measurement on the tooth surface is completed (step 1).
2) If not, repeat the procedure from step 1 until a correct result is obtained.

When the tooth contact measurement on one tooth surface of the gear W is completed as described above, the pulse motor 2 is driven by a command from the computer 10, the turntable 1 is rotated by a predetermined amount, and the gear set on this is set. W is 1
Only the tooth is determined, and the tooth contact of the next tooth is measured by the same procedure as described above. When this operation is performed on all the teeth of the gear W, the measurement of the tooth contact over all the teeth of the gear W is completed.

FIG. 5 shows an example of a grayscale image of the tooth surface output by the color printer 12. In FIG. 5, an area e is displayed in color, for example, in yellow, and this area e is an area having no tooth contact at all. The area f is displayed in red, for example, in color. The area f is an area in which the tooth contact is weak (area in which the hit is extended when a load is applied). The area g is displayed in black, for example, in color. g indicates a region where the tooth contact is strong.

Thus, from the output results shown in FIG. 5, the tooth contact is shifted to the right of the tooth surface, and the area g where the contact is strong is further shifted to the right of the area (f + g) where the tooth is touched. I understand.

As described above, according to the present embodiment, not only the boundary of the tooth contact but also the strength is displayed, so that more detailed data on the tooth contact can be obtained.

Further, the image processing for one tooth is performed instantaneously, and the gear W is automatically determined one by one at an appropriate timing by the pulse motor 2, so that the measurement of the tooth contact with respect to all the teeth is efficiently performed in a short time. You.

Further, according to the present embodiment, it is not necessary to put the gear W to be measured in a dark room, and image processing can be performed even with rough natural light, so that there is an advantage that measurement is greatly simplified.

(Effects of the Invention) As is apparent from the above description, according to the present invention, the tooth for measuring the tooth contact of the gear after the tooth surface coated with the paint is once meshed with the mating gear not coated with the paint. Driving means for indexing and rotating the set gears one tooth at a time, illuminating means for irradiating light to the tooth surfaces of the gears, and displaying images of the gears as R (red), G (green), A color camera that can be read in B (blue), and an image read by the color camera is binarized for each of the R, G, and B components with a threshold value that is optimal for the luminance of each component in that state. Processing means for performing a binarization process and combining the binarized images obtained thereby to display a shade of an image; control means for controlling the operation of the driving means, image processing means and the like; and To output a grayscale image of the tooth surface obtained by Because of the configuration including the means, it is possible to obtain the effect that the boundary and the strength of the tooth contact can be easily and quickly displayed for all the teeth of the gear.

[Brief description of the drawings]

FIG. 1 is a block diagram of a tooth contact measuring device according to the present invention, FIG. 2 is a flowchart showing a procedure of tooth contact measurement, and FIGS. 3 and 4 (a), (b) and (c) are images. FIG. 5 is a grayscale image of a tooth surface showing an example of a tooth contact measurement result. 2 ... Pulse motor (drive means), 4 ... Color CCD
Camera, 6: Lighting device (lighting means), 8: Image processing board (image processing means), 9: AV television (output means), 10: Computer (control means), 11: CRT
(Output means), 12 color printer (output means),
W ... Gears.

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) G01M 13/02 G01N 21 / 25,21 / 88 G01B 11/24 G01F 15/62 H04N 7/18

Claims (1)

(57) [Claims] A tooth contact measuring device for measuring a tooth contact of a gear after a tooth surface coated with a paint is once meshed with a mating gear not coated with a paint. A driving means for indexing and rotating, a lighting means for irradiating the tooth surface of the gear with light, a color camera capable of reading an image of the gear with R (red), G (green), and B (blue); The image read by the color camera is subjected to binarization processing for each of the R, G, and B components at a threshold value that is optimal for the luminance of each component in that state, and the resulting binarization is performed. Image processing means for combining the images to display the gray scale of the image; control means for controlling the operation of the driving means, the image processing means, etc .; and an output for outputting a gray scale image of the tooth surface obtained by the image processing means Tooth comprising a means Hit measuring machine.