CN109886949A - A kind of straight spur gear multi-parameter assessment method based on machine vision - Google Patents
A kind of straight spur gear multi-parameter assessment method based on machine vision Download PDFInfo
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- CN109886949A CN109886949A CN201910133018.1A CN201910133018A CN109886949A CN 109886949 A CN109886949 A CN 109886949A CN 201910133018 A CN201910133018 A CN 201910133018A CN 109886949 A CN109886949 A CN 109886949A
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- spur gear
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Abstract
The invention discloses a kind of straight spur gear multi-parameter assessment method based on machine vision, method and step is as follows: obtaining Z tooth straight spur gear profile by image procossing, straight spur gear precise boundary and straight spur gear axis hole centre coordinate are obtained using function programming in Virtual instrument LabVIEW, every once doing a detection line, obtain 360 flank profil marginal points informations, the distance for asking flank profil to axis hole center forms array, the average value of Z value is tip diameter before the arrangement of array ascending order, the average value of Z value is root diameter below, find the ipsilateral penumbra point of each flank profil and reference circle, obtain the intersecting point coordinate of Z ipsilateral flank profils, individual circular pitch error f is calculated by formulapt, the invention has the advantages that friendly interface, function easily extends, and detection efficiency and detection accuracy can be improved in easy to operate visualization.
Description
Technical field
The present invention relates to straight spur gear multi-parameter assessment method technical fields, are regarded more particularly to one kind based on machine
The straight spur gear multi-parameter assessment method of feel.
Background technique
Traditional gear parameter method of inspection is contact measurement, and this method is time-consuming, and detection parameters are single, different ginsengs
Number, which needs to have with different detectors, to be measured, and heavy workload is high to the technical requirements of survey crew.To overcome the above disadvantages, will
Virtual instrument technology, image processing techniques are combined with machine vision technique, using LabVIEW software as development platform, to straight-tooth
Roller gear multi-parameter is detected, and detection efficiency and detection accuracy are improved, and has practical application value.
Summary of the invention
The straight spur gear multi-parameter based on machine vision that in order to solve the above-mentioned technical problems, the present invention provides a kind of
Assessment method.The assessment method friendly interface, visualization easily extend, are high-efficient, easy to operate；Acquisition data can be carried out certainly
Dynamic preservation, playback and the visualization evaluation of straight spur gear parameter.
The present invention adopts the following technical scheme: a kind of straight spur gear multi-parameter assessment method based on machine vision,
It is characterized in that method and step is as follows:
Step 1: obtaining the shooting photo of high quality by being installed on the workbench camera, and the image of acquisition is stored to meter
In calculation machine, the image saved is read when evaluation, and the straight spur gear profile of shared Z tooth is obtained by image procossing, due to
Straight spur gear profile is not the profile of perfect condition, straight spur gear axis hole profile annular region is selected, by extroversion
It is interior every once doing a centripetal detection line, the intersection point with these detection lines and image is the inspection of straight spur gear axis hole bore edges
Measuring point selects edge strength threshold value, removes the part of trough of belt in image, obtain the K straight spur gear axis hole side in addition to keyway
Edge test point constitutes array, carries out least square method circle fitting to K edge detection point, straight spur gear axis hole can be obtained
Central coordinate of circle and radius value, above functions may be implemented by function in Virtual instrument LabVIEW, obtain axis hole centre coordinate with
Afterwards, using IMAQ Shift image translation function in LabVIEW, straight spur gear is moved into image center；
Step 2: selected flank profil annular region obtained 360 flank profil marginal points informations every once doing a detection line,
Flank profil marginal point coordinate can be obtained by function in Virtual instrument LabVIEW, for Accurate Assessment, since axis hole center is straight-tooth
The benchmark of roller gear, in the hope of 360 flank profil marginal points at a distance from axis hole centre coordinate, obtain array m1 [360], will count
The descending sequence of group m1 [360] obtains array m2 [360], and the average value of Z data is as tooth top before access group m2 [360]
Radius of circle ra, tip diameter daFor 2ra, then by array m2 [360] it is ascending sequence obtain array m3 [360], access group m3
[360] average value of the Z data in front is as root radius rf, root diameter dfFor 2rf；
Step 3: individual circular pitch error fptAssessment method be it is such, reference radius can be asked by formula r=mz/2
Out, using axis hole center as the center of circle, reference circle is made with reference radius r, since edge is that acute variation occurs for gray scale in image
The intersection point gray scale of zone boundary, each flank profil and reference circle is in variation, with LabVIEW function IMAQ ROIProfile letter
Number obtains the information at edge, accesses IMAQ simple edge function, detects marginal point letter all in reference circle detection line
It ceases, flank profil and reference circle are there are two point a1, b1 on the left of each transverse tooth thickness, and there are two point c1, d1, Z with reference circle for transverse tooth thickness right side flank profil
A tooth just has 4Z point to intersect with reference circle, in order to which Accurate Assessment obtains Z ipsilateral flank profils with the method for interception array
Marginal points information a1(x1,y1),a2(x2,y2)......,az(xz,yz), it is known that reference radius r, two neighboring point a1(x1,
y1),a2(x2,y2) reference circle minor arc length be tooth pitch ρ, calculation formula (1) goes out formula by the relation derivation of trigonometric function
(2), measure altogether Z tooth pitch data deposit array a [z], successively subtract theoretical tooth pitch π m, take wherein maximum difference be single
Circular pitch deviation fpt；
ρ=θ * r........................................ (1)
Compared with prior art, the present invention has the advantage that: to multi-parameter tip diameter, the tooth root of straight spur gear
Circular diameter and tooth pitch are evaluated, and friendly interface, function easily extends, easy to operate, and detection efficiency and detection can be improved in visualization
Precision.
Detailed description of the invention
Fig. 1 is flank profil edge detection annular region schematic diagram of the invention.
Fig. 2 is flank profil edge and reference circle intersection point schematic diagram of the invention.
Fig. 3 is individual circular pitch error f of the inventionptFigure.
Specific embodiment
The preferred embodiment of the present invention is described in detail with reference to the accompanying drawing, so that advantages and features of the invention energy
It is easier to be readily appreciated by one skilled in the art, so as to make a clearer definition of the protection scope of the present invention.
Please refer to Fig. 1, Fig. 2, Fig. 3, a kind of straight spur gear multi-parameter assessment method based on machine vision, feature
It is that method and step is as follows:
Step 1: obtaining the shooting photo of high quality by being installed on the workbench camera, and the image of acquisition is stored to meter
In calculation machine, the image saved is read when evaluation, and the straight spur gear profile of shared Z tooth is obtained by image procossing, due to
Straight spur gear profile is not the profile of perfect condition, straight spur gear axis hole profile annular region is selected, by extroversion
It is interior every once doing a centripetal detection line, the intersection point with these detection lines and image is the inspection of straight spur gear axis hole bore edges
Measuring point selects edge strength threshold value, removes the part of trough of belt in image, obtain the K straight spur gear axis hole side in addition to keyway
Edge test point constitutes array, carries out least square method circle fitting to K edge detection point, straight spur gear axis hole can be obtained
Central coordinate of circle and radius value, above functions may be implemented by function in Virtual instrument LabVIEW, obtain axis hole centre coordinate with
Afterwards, using IMAQ Shift image translation function in LabVIEW, straight spur gear is moved into image center；
Step 2: selected flank profil annular region obtained 360 flank profil marginal points informations every once doing a detection line,
Flank profil marginal point coordinate can be obtained by function in Virtual instrument LabVIEW, for Accurate Assessment, since axis hole center is straight-tooth
The benchmark of roller gear, in the hope of 360 flank profil marginal points at a distance from axis hole centre coordinate, obtain array m1 [360], will count
The descending sequence of group m1 [360] obtains array m2 [360], and the average value of Z data is as tooth top before access group m2 [360]
Radius of circle ra, tip diameter daFor 2ra, then by array m2 [360] it is ascending sequence obtain array m3 [360], access group m3
[360] average value of the Z data in front is as root radius rf, root diameter dfFor 2rf；
Step 3: individual circular pitch error fptAssessment method be it is such, reference radius can be asked by formula r=mz/2
Out, using axis hole center as the center of circle, reference circle is made with reference radius r, since edge is that acute variation occurs for gray scale in image
The intersection point gray scale of zone boundary, each flank profil and reference circle is in variation, with LabVIEW function IMAQ ROIProfile letter
Number obtains the information at edge, accesses IMAQ simple edge function, detects marginal point letter all in reference circle detection line
It ceases, flank profil and reference circle are there are two point a1, b1 on the left of each transverse tooth thickness, and there are two point c1, d1, Z with reference circle for transverse tooth thickness right side flank profil
A tooth just has 4Z point to intersect with reference circle, in order to which Accurate Assessment obtains Z ipsilateral flank profils with the method for interception array
Marginal points information a1(x1,y1),a2(x2,y2)......,az(xz,yz), it is known that reference radius r, two neighboring point a1(x1,
y1),a2(x2,y2) reference circle minor arc length be tooth pitch ρ, calculation formula (1) goes out formula by the relation derivation of trigonometric function
(2), measure altogether Z tooth pitch data deposit array a [z], successively subtract theoretical tooth pitch π m, take wherein maximum difference be single
Circular pitch deviation fpt；
ρ=θ * r..................... (I)
Not limited to this, any change or replacement expected without creative work should all be covered in guarantor of the invention
Within the scope of shield.Therefore, protection scope of the present invention should be determined by the scope of protection defined in the claims.
Claims (1)
1. a kind of straight spur gear multi-parameter assessment method based on machine vision, it is characterised in that method and step is as follows:
Step 1: obtaining the shooting photo of high quality by being installed on the workbench camera, and the image of acquisition is stored to computer
In, the image saved is read when evaluation, the straight spur gear profile of shared Z tooth is obtained by image procossing, due to straight-tooth
Roller gear profile is not the profile of perfect condition, selectes straight spur gear axis hole profile annular region, and ecto-entad is every
Every once doing a centripetal detection line, the intersection point with these detection lines and image is the detection of straight spur gear axis hole bore edges
Point selects edge strength threshold value, removes the part of trough of belt in image, obtain the K straight spur gear axis hole edge in addition to keyway
Test point constitutes array, carries out least square method circle fitting to K edge detection point, straight spur gear axis hole circle can be obtained
Heart coordinate and radius value, will be straight using IMAQ Shift image translation function in LabVIEW after obtaining axis hole centre coordinate
Tooth roller gear moves to image center；
Step 2: selected flank profil annular region obtains 360 flank profil marginal points informations, passes through every once doing a detection line
Flank profil marginal point coordinate can be obtained in function in Virtual instrument LabVIEW, for Accurate Assessment, since axis hole center is straight tooth column
The benchmark of gear, in the hope of 360 flank profil marginal points at a distance from axis hole centre coordinate, array m1 [360] are obtained, by array m1
[360] descending sequence obtains array m2 [360], and the average value of Z data is as outside circle half before access group m2 [360]
Diameter ra, tip diameter daFor 2ra, then by array m2 [360] it is ascending sequence obtain array m3 [360], access group m3
[360] frontZThe average value of a data is as root radius rf, root diameter dfFor 2rf；
Step 3: individual circular pitch error fptAssessment method be it is such, reference radius can be found out by formula r=mz/2,
Using axis hole center as the center of circle, reference circle is made with reference radius r, since edge is the region that acute variation occurs for gray scale in image
The intersection point gray scale of boundary, each flank profil and reference circle is in variation, with LabVIEW function IMAQ ROIProfile function call
To the information at edge, IMAQ simple edge function is accessed, detects marginal points information all in reference circle detection line, often
There are two point a1, b1 for flank profil and reference circle on the left of a transverse tooth thickness, and there are two point c1, d1 for transverse tooth thickness right side flank profil and reference circle, and Z tooth is just
There is 4Z point to intersect with reference circle, in order to which Accurate Assessment obtains the marginal point of Z ipsilateral flank profils with the method for interception array
Information a1(x1,y1),a2(x2,y2)......,az(xz,yz), it is known that reference radius r, two neighboring point a1(x1,y1),a2(x2,
y2) reference circle minor arc length be tooth pitch ρ, calculation formula (1) goes out formula (2) by the relation derivation of trigonometric function, measures altogether
Z tooth pitch data be stored in array a [z], successively subtract theoretical tooth pitch π m, take wherein maximum difference be individual circular pitch error fpt；
ρ=θ * r...................................... (1)
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115035107A (en) * | 2022-08-10 | 2022-09-09 | 山东正阳机械股份有限公司 | Axle gear working error detection method based on image processing |
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