CN114353732A - Workpiece flatness detection device - Google Patents
Workpiece flatness detection device Download PDFInfo
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- CN114353732A CN114353732A CN202111683452.0A CN202111683452A CN114353732A CN 114353732 A CN114353732 A CN 114353732A CN 202111683452 A CN202111683452 A CN 202111683452A CN 114353732 A CN114353732 A CN 114353732A
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Abstract
The invention discloses a workpiece flatness detection device which comprises a carrying module, a pressure applying module, a driving module, a data processing module and a result processing module, wherein the carrying module is used for carrying a workpiece; the pressure application module enables the flexible measurement sensor to be in contact with a workpiece to be measured at constant pressure; the driving module drives the flexible measuring sensor to move along the surface of the workpiece to be measured at a constant speed; the data processing module is used for fitting a target signal curve of the flexible measurement sensor to reflect a surface curve of the workpiece to be measured; the result processing module compares the target signal curve with a preset standard curve of a standard workpiece to obtain a comparison result; the method has the advantages that the conversion between the datamation and the imaging is realized, the excellent conversion capability is realized, the flatness difference of the small part in the surface of the workpiece can be really restored, the flatness detection accuracy and the detection efficiency of the workpiece are improved, and the detection cost is reduced.
Description
Technical Field
The invention relates to workpiece parameter detection, in particular to a workpiece flatness detection device.
Background
At present, two modes are generally adopted for flatness detection of workpieces in the industry, one mode is high-precision detection through manual work, so that technical workers with higher technical levels are required to be used for detection, and the method has the characteristics of higher detection precision, low efficiency and uncontrollable error rate; the other type is detection by adopting detection equipment based on machine vision, and has the characteristics of higher detection precision, high cost and low efficiency improvement.
Disclosure of Invention
The present invention is directed to solve at least one of the problems of the prior art, and to provide a workpiece flatness detecting apparatus.
The technical scheme adopted by the invention for solving the problems is as follows:
a workpiece flatness detecting apparatus comprising:
the object carrying module is used for placing a workpiece to be tested;
the pressure application module is provided with a flexible measurement sensor and is used for enabling the flexible measurement sensor to be in contact with the workpiece to be measured at constant pressure;
the driving module is connected with the pressure applying module and is used for driving the flexible measuring sensor to move along the surface of the workpiece to be measured at a constant speed;
the data processing module is connected with the flexible measuring sensor and used for fitting a target signal curve of the flexible measuring sensor, and the target signal curve is used for reflecting a surface curve of the workpiece to be measured;
and the result processing module is connected with the data processing module and is used for comparing the target signal curve with a preset standard curve of a standard workpiece to obtain a comparison result.
Furthermore, the workpiece flatness detection device further comprises a display module, the display module is connected with the data processing module, and the display module is used for displaying the target signal curve.
Further, the display module is connected with the result comparison module, and the display module is used for displaying the comparison result.
Further, the pressure applying module is provided with a hydraulic push rod.
Furthermore, the driving module is a multi-joint mechanical arm and a sliding guide rail, and the multi-joint mechanical arm is connected to the sliding guide rail in a sliding mode.
Further, the flexible measuring sensor has a flexible measuring surface made of a flexible material.
Further, when the flexible measuring sensor is pressed, the resistance of the flexible measuring sensor changes.
Further, the amount of compressive deformation of the flexible measurement sensor is inversely related to the resistance of the flexible measurement sensor.
Further, the result processing module is configured to compare the target signal curve with a preset standard curve of a standard workpiece to obtain a comparison result, and specifically includes: the result processing module is used for segmenting the target signal curve to obtain a multi-segment segmentation curve; and the result processing module is also used for calculating the similarity between the segmented curve and the comparison segment by taking the part of the standard curve corresponding to the segmented curve as a comparison segment for each segmented curve, and taking the similarity as the comparison result.
Further, the similarity is expressed as:
k is the similarity, L1 is the euclidean distance of the piecewise curve from the contrast segment; a (x) is a parametric representation of the piecewise curve, B (x) is a parametric representation of the contrast segment.
The workpiece flatness detection device at least has the following beneficial effects: for the measurement of the flatness of the workpiece, a method for measuring by adopting a flexible sensor is provided, the conversion between datamation and imaging is realized, the excellent conversion capability is realized, the flatness difference of a small part in the surface of the workpiece can be really restored, the precision of the flatness detection of the workpiece is improved, the detection efficiency is improved, and the detection cost is reduced.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The invention is further illustrated with reference to the following figures and examples.
FIG. 1 is a block diagram of a device for inspecting flatness of a workpiece according to an embodiment of the present invention;
fig. 2 is a schematic signal transmission diagram of a workpiece flatness detecting apparatus according to an embodiment of the present invention.
Detailed Description
Reference will now be made in detail to the present preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to like elements throughout.
In the description of the present invention, it should be understood that the orientation or positional relationship referred to in the description of the orientation, such as the upper, lower, front, rear, left, right, etc., is based on the orientation or positional relationship shown in the drawings, and is only for convenience of description and simplification of description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
In the description of the present invention, the meaning of a plurality of means is one or more, the meaning of a plurality of means is two or more, and larger, smaller, larger, etc. are understood as excluding the number, and larger, smaller, inner, etc. are understood as including the number. If the first and second are described for the purpose of distinguishing technical features, they are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.
In the description of the present invention, unless otherwise explicitly limited, terms such as arrangement, installation, connection and the like should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above terms in the present invention in combination with the specific contents of the technical solutions.
Referring to fig. 1 and 2, an embodiment of the present invention provides a workpiece flatness detecting apparatus.
The workpiece flatness detecting apparatus includes a loading module 100, a pressing module 200, a driving module 300, a data processing module 400, and a result processing module 500.
The object carrying module 100 is used for placing a workpiece to be measured; the pressure application module 200 is provided with a flexible measurement sensor 210, and the pressure application module 200 is used for enabling the flexible measurement sensor 210 to be in contact with a workpiece to be measured at constant pressure; the driving module 300 is connected with the pressure applying module 200, and the driving module 300 is used for driving the flexible measuring sensor 210 to move along the surface of the workpiece to be measured at a constant speed; the data processing module 400 is connected with the flexible measurement sensor 210, the data processing module 400 is used for fitting a target signal curve of the flexible measurement sensor 210, and the target signal curve is used for reflecting a surface curve of a workpiece to be measured; the result processing module 500 is connected to the data processing module 400, and the result processing module 500 is configured to compare the target signal curve with a preset standard curve of a standard workpiece to obtain a comparison result.
In this embodiment, a workpiece to be measured is placed on the carrier module 100 and fixed. The driving module 300 and the pressing module 200 are started, the pressing module 200 makes the flexible measuring sensor 210 contact with the workpiece to be measured with a constant pressure, and a pressure exists between the flexible measuring sensor 210 and the workpiece to be measured, so that the flexible measuring sensor 210 generates a compression deformation quantity. The driving module 300 then drives the pressing module 200 to move along the surface of the workpiece to be measured at a constant speed, in the process, the flexible measurement sensor 210 scans the surface of the workpiece to be measured and generates a signal. The data processing module 400 receives the signal of the flexible measurement sensor 210 and fits a target signal curve to reflect the surface curve of the workpiece to be measured, so that the flatness of the surface of the workpiece can be visually expressed. The result processing module 500 compares the target signal curve with a preset standard curve of a standard workpiece to obtain a comparison result, and the difference between the flatness of the workpiece to be measured and the flatness of the standard workpiece can be visually reflected through the comparison result.
For the measurement of the flatness of the workpiece, a method for measuring by adopting a flexible sensor is provided, the conversion between datamation and imaging is realized, the excellent conversion capability is realized, the flatness difference of a small part in the surface of the workpiece can be really restored, the precision of the flatness detection of the workpiece is improved, the detection efficiency is improved, and the detection cost is reduced.
In some embodiments of the present invention, the apparatus for detecting flatness of a workpiece further includes a display module 600, the display module 600 is connected to the data processing module 400, and the display module 600 is configured to display a target signal curve. The target signal curve is displayed through the display module 600, and the target signal curve can be imaged, so that the flatness of the surface of the workpiece can be visually displayed to a measurer.
In some embodiments of the present invention, the display module 600 is connected to the result comparison module, and the display module 600 is used for displaying the comparison result. The comparison result is displayed through the display module 600, and can be graphically represented, so that the difference between the flatness of the workpiece to be measured and the flatness of the standard workpiece can be intuitively reflected to a measurer.
In some embodiments of the present invention, the pressure application module 200 is provided with a hydraulic push rod. The flexible measuring sensor 210 is pressed towards the direction of the workpiece to be measured through the hydraulic push rod, so that the flexible measuring sensor 210 deforms, and further generates a signal. In addition, the hydraulic push rod is used as the pressure applying module 200, which is beneficial to enabling the flexible measuring sensor 210 to continuously press the workpiece to be measured with constant pressure. The pressure value may be set by a controller of the hydraulic ram.
In some embodiments of the present invention, the driving module 300 is a multi-joint robot 310 and a sliding rail 320, the multi-joint robot 310 is slidably connected to the sliding rail 320, and the multi-joint robot 310 can reciprocate along the direction of the sliding rail 320. Wherein the degree of rotation of the joints of the multi-joint robotic arm 310 has at least 180 degrees. For a three-dimensional workpiece to be measured, the workpiece to be measured with an arc-shaped surface is set, and the flexible measurement sensor 210 can move around the surface of the workpiece to be measured at a constant speed through the cooperation of the multi-joint mechanical arm 310 and the sliding guide 320.
Specifically, in this embodiment, the constant speed of movement of the pressure application module 200 ranges in magnitude from 1cm/min to 10 cm/min. The magnitude of the constant pressure between the roughness sensor 24 and the object to be measured ranges from 0.1N to 1N. Of course, in other embodiments, the values of constant speed and constant pressure may take on other values depending on the actual requirements.
In particular, the flexible measuring sensor 210 has a flexible measuring surface made of a flexible material, which can better conform to the surface of the workpiece to be measured. The flexible measuring surface is larger in measuring contact area and higher in measuring efficiency relative to the measuring needle.
In some embodiments of the present invention, when the flexible measurement sensor 210 is compressed, the resistance of the flexible measurement sensor 210 changes. Specifically, the amount of compressive deformation of the flexible measurement sensor 210 is inversely related to the resistance of the flexible measurement sensor 210. Namely, the more convex one part of the surface of the object to be measured is, the larger the compression deformation amount is, and the smaller the resistance is; the more concave one position of the surface of the object to be measured is, the smaller the compression deformation amount is, and the larger the resistance is.
In some embodiments of the present invention, the step of comparing the target signal curve with a preset standard curve of a standard workpiece to obtain a comparison result specifically includes: segmenting the target signal curve to obtain a multi-segment segmented curve; and for each section of the segmented curve, taking the part of the standard curve corresponding to the segmented curve as a comparison section, calculating the similarity between the segmented curve and the comparison section, and taking the similarity as a comparison result. Specifically, the similarity is expressed as:
k is the similarity, L1 is the Euclidean distance of the piecewise curve from the contrast segment; a (x) is a parametric representation of the piecewise curve, B (x) is a parametric representation of the contrast segment. The coincidence area of the segmented curve and the contrast section can be calculated through K, so that the non-coincidence area of the segmented curve and the contrast section can be obtained, the similarity of the segmented curve and the contrast section is obtained, and the deviation degree of the segmented curve and the contrast section is obtained.
In the step of obtaining a multi-segment piecewise curve by segmenting the target signal curve, the target signal curve may be segmented by averaging to obtain a plurality of segmented curves having equal distances on the X axis.
Of course, a plurality of key points of the target signal curve may be marked, and then the target signal curve is segmented according to the key points to obtain a multi-segment segmented curve. In addition, the multiple sections of segmented curves are compared respectively to obtain a comparison result corresponding to each section of segmented curve, and the flatness of the workpiece can be analyzed from multiple dimensions through the multiple comparison results.
The above description is only a preferred embodiment of the present invention, and the present invention is not limited to the above embodiment, and the present invention shall fall within the protection scope of the present invention as long as the technical effects of the present invention are achieved by the same means.
Claims (10)
1. A workpiece flatness detecting apparatus, comprising:
the object carrying module is used for placing a workpiece to be tested;
the pressure application module is provided with a flexible measurement sensor and is used for enabling the flexible measurement sensor to be in contact with the workpiece to be measured at constant pressure;
the driving module is connected with the pressure applying module and is used for driving the flexible measuring sensor to move along the surface of the workpiece to be measured at a constant speed;
the data processing module is connected with the flexible measuring sensor and used for fitting a target signal curve of the flexible measuring sensor, and the target signal curve is used for reflecting a surface curve of the workpiece to be measured;
and the result processing module is connected with the data processing module and is used for comparing the target signal curve with a preset standard curve of a standard workpiece to obtain a comparison result.
2. The apparatus of claim 1, further comprising a display module, the display module is connected to the data processing module, and the display module is configured to display the target signal curve.
3. The apparatus of claim 2, wherein the display module is connected to the result comparison module, and the display module is configured to display the comparison result.
4. A workpiece flatness detecting device according to claim 1, wherein said pressing module is provided with a hydraulic push rod.
5. The apparatus of claim 1, wherein the driving module is a multi-joint robot and a sliding guide rail, and the multi-joint robot is slidably connected to the sliding guide rail.
6. A workpiece flatness detection apparatus according to claim 1, wherein said flexible measuring transducer has a flexible measuring surface made of a flexible material.
7. A workpiece flatness detecting apparatus according to claim 6, wherein when said flexible measuring sensor is pressed, the resistance of said flexible measuring sensor changes.
8. A workpiece flatness detecting apparatus according to claim 7, wherein the amount of compressive deformation of said flexible measuring sensor is inversely related to the resistance of said flexible measuring sensor.
9. The apparatus of claim 1, wherein the result processing module is configured to compare the target signal curve with a preset standard curve of a standard workpiece to obtain a comparison result, and specifically:
the result processing module is used for segmenting the target signal curve to obtain a multi-segment segmentation curve;
and the result processing module is also used for calculating the similarity between the segmented curve and the comparison segment by taking the part of the standard curve corresponding to the segmented curve as a comparison segment for each segmented curve, and taking the similarity as the comparison result.
10. A workpiece flatness detection apparatus according to claim 9, wherein said similarity is expressed as:
k is the similarity, L1 is the euclidean distance of the piecewise curve from the contrast segment; a (x) is a parametric representation of the piecewise curve, B (x) is a parametric representation of the contrast segment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111683452.0A CN114353732A (en) | 2021-12-31 | 2021-12-31 | Workpiece flatness detection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111683452.0A CN114353732A (en) | 2021-12-31 | 2021-12-31 | Workpiece flatness detection device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114353732A true CN114353732A (en) | 2022-04-15 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111683452.0A Withdrawn CN114353732A (en) | 2021-12-31 | 2021-12-31 | Workpiece flatness detection device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114353732A (en) |
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2021
- 2021-12-31 CN CN202111683452.0A patent/CN114353732A/en not_active Withdrawn
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