CN110986807A - Non-contact measuring method for multi-stage inner diameter of stepped deep through hole metal part - Google Patents
Non-contact measuring method for multi-stage inner diameter of stepped deep through hole metal part Download PDFInfo
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- CN110986807A CN110986807A CN201911083308.6A CN201911083308A CN110986807A CN 110986807 A CN110986807 A CN 110986807A CN 201911083308 A CN201911083308 A CN 201911083308A CN 110986807 A CN110986807 A CN 110986807A
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- metal part
- inner diameter
- stepped
- light source
- contact measurement
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/08—Measuring arrangements characterised by the use of optical techniques for measuring diameters
- G01B11/12—Measuring arrangements characterised by the use of optical techniques for measuring diameters internal diameters
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- General Physics & Mathematics (AREA)
- Length Measuring Devices By Optical Means (AREA)
Abstract
The stepped deep through hole metal part usually presents mirror reflection due to smooth surface, and a clear and distinguishable boundary image is often difficult to obtain when a common method is used for polishing and drawing, so that great difficulty is brought to a vision-based non-contact measurement method. The invention provides an illumination mode which utilizes a bottom rod-shaped or point-shaped light source to place a camera and the light source on two sides of a part, obtains a clear deep hole boundary image by controlling the penetration depth of the light source and utilizing the processing fillet reflection of a metal part, thereby better solving the problem of image acquisition under the condition.
Description
Technical Field
The invention belongs to the technical field of metal part measurement, and particularly relates to a non-contact measurement method for multi-stage inner diameters of a stepped deep through hole metal part.
Background
The stepped deep through hole metal part usually presents mirror reflection due to smooth surface, and a clear and variable boundary image is often difficult to obtain when a common method is used for polishing and drawing, so that great difficulty is brought to a vision-based non-contact measurement method.
Disclosure of Invention
The invention aims to provide a non-contact measuring method for the multi-stage inner diameter of a stepped deep through hole metal part, which solves the problem that a clear and variable boundary image is often difficult to obtain when a common method is used for polishing and drawing because the surface of the stepped deep through hole metal part is smooth and generally presents mirror reflection.
The purpose of the invention is realized by the following technical scheme:
a non-contact measurement method for the multi-stage inner diameter of a stepped deep through hole metal part specifically comprises the following steps:
placing the step-shaped workpiece to be detected in the light shield;
placing an industrial camera at one end of the step-shaped workpiece to be detected, wherein the size of the step-shaped workpiece is large;
and (3) the light source is inserted from one end of the step-shaped workpiece to be detected, which is small in size, through the 3D moving frame.
Further: the interior of the light shield is black matt.
Further: the inside of the light source is provided with a luminous optical fiber, and the outside of the light source is provided with a transparent hard tube.
Further: in order to photograph the inner diameters of different stepped workpieces, a light source needs to be inserted into different inner diameter depths.
Further: the industrial camera employs high resolution.
Further: the lens of the industrial camera adopts a long-focus lens or a telecentric lens which is suitable for the size, the caliber and the working distance of a step-shaped workpiece.
Further: and automatically adjusting the positions of the light source and the step-shaped workpiece to be detected, and then respectively photographing.
Further: the light source is rod-shaped or point-shaped.
Compared with the prior art, the beneficial effect that this application has is:
a lighting mode that a camera and a light source are arranged on two sides of a step-shaped workpiece to be detected by utilizing a rod-shaped or point-shaped light source at the bottom is adopted, a clear deep through hole boundary image is obtained by controlling the penetration depth of the light source and utilizing the processing fillet reflection of the step-shaped workpiece to be detected, so that the problem that the clear variable boundary image is difficult to obtain when a common method is used for polishing and drawing because the surface of a step-shaped deep through hole metal part usually presents mirror reflection is well solved.
Drawings
FIG. 1 is a diagram illustrating the state of the light source of the present invention probing different depths to different aperture boundaries.
Wherein, 1, a light shield; 2. an industrial camera; 3. a step-shaped workpiece to be detected; 4. a light source.
Detailed Description
The invention is described in further detail below with reference to the accompanying drawings:
as shown in fig. 1, a method for non-contact measurement of the multi-stage inner diameter of a stepped deep through hole metal part specifically comprises the following steps:
s1: the step-shaped workpiece 3 to be detected is arranged in the light shield 1, and the interior of the light shield 1 is black matt, so that the upper part of the light shield 1 is prevented from being interfered by an external stray light source 4.
S2: the industrial camera 2 is arranged at one end of the ladder-shaped workpiece 3 to be measured, which is large in size.
S3: the light source 4 is inserted from one end of the step-shaped workpiece 3 to be detected, which is small in size, through the 3D moving frame, and the specified position and the specified height can be accurately reached.
Wherein the light source 4 mentioned in S3 has a light-emitting optical fiber inside and a transparent hard tube outside, and the glass tube is preferred.
The light source 4 is rod-shaped or point-shaped.
In order to photograph the inside diameters of different stepped workpieces, the light source 4 needs to be driven into different inside diameter depths.
The industrial camera 2 in S2 adopts a high resolution, and the lens adopts a long-focus lens or a telecentric lens adapted to the size, caliber and working distance of the stepped workpiece.
And moving the part to be detected by the 3D frame mechanical device to adjust the distance between the detection position and the camera so as to obtain a clear large-size image.
The positions of the light source 4 and the parts are automatically adjusted, and then the images are respectively photographed to obtain clear outline images.
The working principle is as follows: a lighting mode that a camera and a light source 4 are arranged on two sides of a ladder-shaped workpiece 3 to be detected by utilizing a bottom rod-shaped or point-shaped light source 4 is adopted, a clear deep through hole boundary image is obtained by controlling the penetration depth of the light source 4 and utilizing the processing fillet reflection of the ladder-shaped workpiece 3 to be detected, and therefore the problem that the clear variable boundary image is difficult to obtain when a common method is used for polishing and drawing because the surface of a ladder-shaped deep through hole metal part is smooth and generally presents mirror reflection is solved well.
It is noted that relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that an article or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The above description is merely exemplary of the present application and is presented to enable those skilled in the art to understand and practice the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
It is to be understood that the present application is not limited to what has been described above, and that various modifications and changes may be made without departing from the scope thereof. The scope of the application is limited only by the appended claims.
Claims (8)
1. A non-contact measurement method for the multi-stage inner diameter of a stepped deep through hole metal part is characterized by comprising the following steps:
placing the step-shaped workpiece (3) to be detected in the light shield (1);
placing an industrial camera (2) at one end of the step-shaped workpiece (3) to be detected, wherein the size of the step-shaped workpiece is large;
and (3) the light source (4) is inserted from one end of the step-shaped workpiece (3) to be detected, which is small in size, through the 3D moving frame.
2. The method for non-contact measurement of the multi-stage inner diameter of the stepped deep through hole metal part according to claim 1, wherein the inside of the light shield (1) is black matte.
3. The method for non-contact measurement of the multistage inner diameter of the stepped deep through hole metal part according to claim 1, wherein the light source (4) is internally provided with a light-emitting optical fiber and externally provided with a transparent hard tube.
4. The method for non-contact measurement of the multistage inner diameter of the stepped deep through hole metal part according to claim 1, wherein in order to photograph the inner diameters of different stepped workpieces, a light source (4) needs to be inserted into different inner diameter depths.
5. The method for the non-contact measurement of the multi-stage inner diameter of the stepped deep-via metal part according to claim 1, wherein the industrial camera (2) employs high resolution.
6. The method for the non-contact measurement of the multistage inner diameter of the stepped deep through hole metal part according to claim 1, wherein a long-focus lens or a telecentric lens adapted to the size aperture and the working distance of the stepped workpiece is adopted as the lens of the industrial camera (2).
7. The non-contact measurement method for the multi-stage inner diameter of the stepped deep through hole metal part according to claim 1, wherein the positions of the light source (4) and the stepped workpiece (3) to be measured are automatically adjusted and then photographed respectively.
8. The method for the non-contact measurement of the multistage inner diameter of the stepped deep through-hole metal part according to claim 1, wherein the light source (4) is rod-shaped or point-shaped.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911083308.6A CN110986807A (en) | 2019-11-07 | 2019-11-07 | Non-contact measuring method for multi-stage inner diameter of stepped deep through hole metal part |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911083308.6A CN110986807A (en) | 2019-11-07 | 2019-11-07 | Non-contact measuring method for multi-stage inner diameter of stepped deep through hole metal part |
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| CN110986807A true CN110986807A (en) | 2020-04-10 |
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| CN201911083308.6A Pending CN110986807A (en) | 2019-11-07 | 2019-11-07 | Non-contact measuring method for multi-stage inner diameter of stepped deep through hole metal part |
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2019
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Application publication date: 20200410 |
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