CN111288909B - Roundness detection device and method - Google Patents
Roundness detection device and method Download PDFInfo
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- CN111288909B CN111288909B CN202010217812.7A CN202010217812A CN111288909B CN 111288909 B CN111288909 B CN 111288909B CN 202010217812 A CN202010217812 A CN 202010217812A CN 111288909 B CN111288909 B CN 111288909B
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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
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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
- G01B11/24—Measuring arrangements characterised by the use of optical techniques for measuring contours or curvatures
- G01B11/2408—Measuring arrangements characterised by the use of optical techniques for measuring contours or curvatures for measuring roundness
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P90/00—Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
- Y02P90/30—Computing systems specially adapted for manufacturing
Abstract
The invention relates to a roundness detection device and a method. The rotary worktable is used for installing a workpiece, and the driving mechanism is used for driving the rotary worktable to rotate. The measuring mechanism comprises a size measuring assembly, a controller and a display, the size measuring assembly is used for sampling and measuring multiple groups of data of the workpiece, the controller can draw a two-dimensional plane graph through the data, and the diameter and the roundness of the workpiece are calculated. And starting the driving mechanism, wherein the driving mechanism drives the rotary workbench to rotate for a circle, and further drives the workpiece arranged on the rotary workbench to rotate for a circle. In the rotating process, the size measuring component samples the workpiece to obtain a plurality of groups of data, the controller draws a two-dimensional plane graph through the data measured by the size measuring component, and the diameter and the roundness of the workpiece are calculated through the controller. Through the combined action of the rotary worktable, the driving mechanism and the measuring mechanism, the roundness of the workpiece can be measured, the structure is simple, and the measuring precision is high.
Description
Technical Field
The invention relates to the technical field of detection equipment, in particular to a roundness detection device and a roundness detection method.
Background
The stator core is an important component for forming a motor magnetic flux loop and fixing a stator coil, and the spliced stator core is a common stator core, and a plurality of punching sheets are tightly pressed and combined into a whole through fasteners to improve the utilization rate of materials and realize automatic winding and efficient splicing. The diameter and the roundness of the spliced stator core need to be detected in the process of compressing and combining, and if the diameter or the roundness has errors with a standard value, the performance of the motor is influenced, so that the noise, the pulsation and the like of the motor are increased. The traditional roundness measuring method adopts a two-point method, a three-coordinate method, a yaw meter and the like, has low detection efficiency and high labor intensity, is easy to generate operation errors, and has low detection precision.
Disclosure of Invention
Therefore, it is necessary to provide a roundness detection apparatus and method, which can reduce measurement errors, improve detection accuracy and efficiency, and reduce labor intensity.
A roundness detection apparatus comprising:
a rotary table for mounting a workpiece;
the driving mechanism is used for driving the rotary worktable to rotate;
the measuring mechanism comprises a size measuring assembly, a display and a controller, the controller is respectively in communication connection with the size measuring assembly and the display, the size measuring assembly is used for sampling and measuring multiple groups of data of the workpiece at a certain height, and the controller can draw a two-dimensional plane graph through the data and calculate the diameter and the roundness of the workpiece.
The roundness detection device at least has the following advantages:
above-mentioned scheme provides a roundness detection device, when needing to carry out diameter and circularity to the work piece and detect, starts actuating mechanism, and actuating mechanism drive swivel work head is rotatory a week, and then drives the work piece rotation a week of installing in swivel work head. In the process of rotating the workpiece, the size measuring component samples the workpiece to obtain a plurality of groups of data, the controller draws a two-dimensional plane graph through the data measured by the size measuring component, and the diameter and the roundness of the workpiece are calculated through the controller. The roundness detection device of the scheme can measure the diameter and the roundness of a workpiece through the combined action of the rotary workbench, the driving mechanism, the size measurement assembly and the controller, has a simple structure and small error, can improve the measurement precision and efficiency, and reduces the labor intensity.
In one embodiment, the dimension measuring assembly includes a first sensing member disposed on one side of the workpiece and a second sensing member disposed opposite the other side of the workpiece.
In one embodiment, the first sensing member is disposed in parallel with the second sensing member.
In one embodiment, the first sensing element comprises a first emitter for being disposed on one side of the workpiece and a first receiver for being disposed opposite the other side of the workpiece; the first emitter comprises a first light source, the first receiver comprises a first CMOS sensor and a first lens connected with the first CMOS sensor through an interface, and light emitted by the first light source can be projected on the first lens after being shielded by the workpiece.
In one embodiment, the second sensing member comprises a second transmitter and a second receiver, the second transmitter is used for being arranged on one side of the workpiece, and the second receiver is used for being oppositely arranged on the other side of the workpiece; the second transmitter comprises a second light source, the second receiver comprises a second CMOS sensor and a second lens connected with the second CMOS sensor through an interface, and light emitted by the second light source can be projected on the second lens after being shielded by the workpiece.
In one embodiment, the first emitter and the first receiver are arranged in the middle of the height direction of the workpiece, and the second emitter and the second receiver are arranged in the middle of the height direction of the workpiece.
In one embodiment, the driving mechanism comprises a speed reduction motor and a gear assembly, and the speed reduction motor is connected with the rotary worktable through the gear assembly.
In one embodiment, the roundness detection apparatus further includes a fixing frame, the fixing frame is provided with a mounting hole, the rotating table is rotatably disposed in the mounting hole, and the dimension measurement assembly is disposed on the fixing frame.
A roundness detection method comprising:
rotating the standard workpiece for one circle, acquiring multiple groups of sampling data at a certain height position of the standard workpiece, obtaining a two-dimensional plane graph of the standard workpiece according to the multiple groups of sampling data, and calculating to obtain the diameter of the standard workpiece;
the measured workpiece rotates for a circle, multiple groups of sampling data at the same height position of the measured workpiece and the standard workpiece are obtained, and a two-dimensional plane graph of the measured workpiece is obtained according to the multiple groups of sampling data;
comparing the two-dimensional plane graph of the workpiece to be measured with the two-dimensional plane graph of the standard workpiece, and automatically compensating and correcting multiple groups of sampling data of the workpiece to be measured according to the two-dimensional plane graph of the standard workpiece;
and carrying out data acquisition on the two-dimensional plane graph after the compensation and correction of the measured workpiece, calculating to obtain the diameter of the measured workpiece, and further calculating to obtain the roundness of the measured workpiece.
The roundness detection method at least has the following advantages:
the scheme provides a roundness detection method, which comprises the steps of firstly obtaining a plurality of groups of sampling data of a standard workpiece at a certain height position, and obtaining a two-dimensional plane graph of the standard workpiece according to the sampling data. And acquiring multiple groups of sampling data of the workpiece to be measured at the same height position, and obtaining a two-dimensional plane graph of the workpiece to be measured according to the sampling data. The two-dimensional plane graph of the measured workpiece is compared with the two-dimensional plane graph of the standard workpiece, the multiple groups of sampling data of the measured workpiece are automatically compensated and corrected, and the diameter and the roundness of the measured workpiece are calculated according to the compensated and corrected sampling data, so that the measuring precision is high, and the error is small.
In one embodiment, the method for performing compensation correction on a plurality of groups of sampling data of a workpiece to be measured comprises the following steps: and eliminating data points with different trends from the two-dimensional plane map of the standard workpiece in the two-dimensional plane map of the measured workpiece, and compensating the data points with the same trend as the two-dimensional plane map of the standard workpiece in the two-dimensional plane map of the measured workpiece.
Drawings
Fig. 1 is a schematic structural diagram of a roundness detection apparatus according to an embodiment of the present invention;
FIG. 2 is a schematic diagram illustrating a roundness detection apparatus according to an embodiment of the present invention;
FIG. 3 is a flowchart illustrating the operation of the roundness detection apparatus according to an embodiment of the present invention;
fig. 4 is a flowchart illustrating a roundness detection method according to an embodiment of the present invention.
Description of the drawings:
10. the device comprises a rotary table, 20, a driving mechanism, 21, a speed reducing motor, 22, a gear assembly, 30, a size measuring assembly, 31, a first sensing piece, 311, a first emitter, 3111, a first light source, 312, a first receiver, 3121, a first CMOS sensor, 3122, a first lens, 32, a second sensing piece, 321, a second emitter, 3211, a second light source, 322, a second receiver, 3221, a second CMOS sensor, 3222, a second lens, 40, a controller, 50, a fixing frame, 60 and a workpiece.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be a mechanical connection or a communication connection; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may be directly contacting the second feature or the first and second features may be indirectly contacting each other through intervening media. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.
Referring to fig. 1, fig. 1 is a schematic structural diagram illustrating a roundness detection apparatus according to an embodiment of the present invention, which includes a rotary table 10, a driving mechanism 20, and a measuring mechanism. The rotary table 10 is used for mounting the workpiece 60, and the driving mechanism 20 is used for driving the rotary table 10 to rotate. The measuring mechanism comprises a size measuring component 30, a controller 40 and a display, wherein the controller 40 is respectively connected with the size measuring component 30 and the display in a communication mode, and the size measuring component 30 is used for sampling and measuring multiple groups of data of the workpiece 60 at a certain height. The controller 40 can plot a two-dimensional plan view through the data and calculate the diameter and roundness of the workpiece 60.
When the roundness detection apparatus needs to detect the diameter and the roundness of the workpiece 60, the drive mechanism 20 is activated, and the drive mechanism 20 drives the rotary table 10 to rotate one revolution, thereby driving the workpiece 60 mounted on the rotary table 10 to rotate one revolution. During the rotation of the workpiece 60, the dimension measuring assembly 30 samples the workpiece 60 to obtain a plurality of sets of data, the controller 40 draws a two-dimensional plane view through the plurality of sets of data measured by the dimension measuring assembly 30, and the controller 40 calculates the diameter and the roundness of the workpiece 60. The roundness detection device of the scheme can measure the diameter and the roundness of the workpiece 60 through the combined action of the rotary worktable 10, the driving mechanism 20 and the measuring mechanism, has a simple structure and small error, and can improve the measuring efficiency and reduce the labor intensity.
It should be noted that, during the rotation of the workpiece 60, the size measuring assembly 30 samples the workpiece 60 to obtain a plurality of sets of data, and the controller 40 plots the plurality of sets of data measured by the size measuring assembly 30 into a two-dimensional plane graph, so that the controller 40 can calculate any diameter of the two-dimensional plane graph, and further obtain a minimum radius and a maximum radius, and the roundness of the workpiece 60 can be obtained by subtracting the minimum radius from the maximum radius. It should be appreciated that a roundness of the workpiece 60 within a certain range, such as a roundness of the workpiece 60 of less than 0.015mm, indicates that the workpiece 60 is a roundness-qualified workpiece.
Specifically, in the present embodiment, the workpiece 60 is a segmented stator core. Under the combined action of the rotary worktable 10, the driving mechanism 20 and the measuring mechanism, a two-dimensional plane diagram of the block type stator iron core can be obtained, so that the diameter and the roundness of the block type stator iron core can be calculated. If the roundness of the block stator core exceeds a certain numerical range, the roundness error of the block stator core is large, which affects the motor performance, for example, noise increases, pulsation increases, and the like. Of course, in other embodiments, the workpiece 60 may be other parts requiring diameter and roundness measurements.
In one embodiment, referring to fig. 1, the dimension measuring assembly 30 includes a first sensing member 31 and a second sensing member 32, the first sensing member 31 is disposed on one side of the workpiece 60, and the second sensing member 32 is disposed on the other side of the workpiece 60. When the size of the workpiece 60 is large, that is, the size of the workpiece 60 exceeds the measurement range of the first sensing element 31 or the second sensing element 32, the first sensing element 31 and the second sensing element 32 need to be respectively disposed on two sides of the workpiece 60. During the rotation of the workpiece 60, the first sensing element 31 and the second sensing element 32 sample the workpiece 60 to obtain a plurality of sets of data, and the controller 40 draws a two-dimensional plane graph according to the data measured by the first sensing element 31 and the second sensing element 32, and calculates the diameter and the roundness of the workpiece 60 through the controller 40. Of course, in other embodiments, when the size of the workpiece 60 does not exceed the sensing range of the first sensing member 31 or the second sensing member 32, only the first sensing member 31 or the second sensing member 32 may be provided, and several sets of data are measured by sampling the workpiece 60 through the first sensing member 31 or the second sensing member 32.
Specifically, in the present embodiment, the workpiece 60 is a segmented stator core, and the diameter of the segmented stator core is 550 mm. The first sensing part 31 and the second sensing part 32 are both two-dimensional high-speed dimension measuring instruments, and the two-dimensional high-speed dimension measuring instruments are respectively arranged on two sides of the block type stator core.
Referring to fig. 1, 2 and 3, fig. 3 is a flowchart illustrating the operation of the roundness detection apparatus according to an embodiment of the present invention. The first sensing member 31 includes a first emitter 311 and a first receiver 312, the first emitter 311 is configured to be disposed on one side of the workpiece 60, and the first receiver 312 is configured to be disposed on the other side of the workpiece 60. The first emitter 311 includes a first light source 3111, the first receiver 312 includes a first CMOS sensor 3121 and a first lens 3122 connected to the first CMOS sensor 3121 through an interface, and light emitted from the first light source 3111 can be projected onto the first lens 3122 through the workpiece 60. Specifically, the light emitted by the first light source 3111 is green LED light. During measurement, the driving mechanism 20 is started, and the driving mechanism 20 drives the rotary table 10 to rotate for one circle, thereby driving the workpiece 60 mounted on the rotary table 10 to rotate for one circle. In the process of rotating the workpiece 60, the first light source 3111 irradiates LED light with uniform brightness to the workpiece 60 in a stripe-shaped parallel light, the LED light is projected onto the first lens 3122 through the shielded portion of the workpiece 60, the first CMOS sensor 3121 captures a shadow shielded by the workpiece 60, and the diameter of the workpiece 60 is measured by the light and dark edge positions of the shadow.
Further, referring to fig. 1, 2 and 3, the second sensing member 32 includes a second transmitter 321 and a second receiver 322, the second transmitter 321 is configured to be disposed on one side of the workpiece 60, and the second receiver 322 is configured to be disposed on the other side of the workpiece 60. The second transmitter 321 includes a second light source 3211, the second receiver 322 includes a second CMOS sensor 3221 and a second lens 3222 connected to the second CMOS sensor 3221 through an interface, and light emitted by the second light source 3211 is blocked by the workpiece 60 and can be projected onto the second lens 3222. Specifically, the light emitted by the second light source 3211 is green LED light. During measurement, the driving mechanism 20 is started, and the driving mechanism 20 drives the rotary table 10 to rotate for one circle, so as to drive the workpiece 60 mounted on the rotary table 10 to rotate for one circle. In the process of rotating the workpiece 60, the second light source 3211 irradiates the workpiece 60 with the LED light with uniform brightness in a strip-like parallel light, the LED light is projected onto the second lens 3222 through the part shielded by the workpiece 60, the second CMOS sensor 3221 captures a shadow shielded by the workpiece 60, and the diameter of the workpiece 60 is measured by the light and dark edge positions of the shadow.
Specifically, the first sensing member 31 is disposed in parallel with the second sensing member 32. The first sensing part 31 and the second sensing part 32 are arranged in parallel to ensure that the workpiece 60 can still be correctly detected during the rotation process, thereby ensuring the accuracy of diameter and roundness measurement.
Referring to fig. 2, fig. 2 is a schematic calculation diagram of a roundness detection apparatus according to an embodiment of the present invention. In fig. 2, a represents the minimum value of the perpendicular distance between the outermost side of the parallel light emitted from the first light source 3111 and the workpiece 60; b represents the minimum value of the perpendicular distance between the outermost side of the parallel light emitted from the second light source 3211 and the workpiece 60; c represents a perpendicular distance between the outermost side of the first light source 3111 emitting parallel light to the outermost side of the second light source 3211 emitting parallel light; d represents the diameter of the workpiece 60. In the process of rotating the workpiece 60, the first light source 3111 irradiates the workpiece 60 with the LED light with uniform brightness in the form of a strip of parallel light, the LED light is projected onto the first lens 3122 through a portion shielded by the workpiece 60, and the light and dark edge positions of the light reaching the first CMOS sensor 3121 are checked, so that the value of a can be calculated. The second light source 3211 irradiates the workpiece 60 with the LED light having uniform brightness in the form of a strip of parallel light, the LED light is projected onto the second lens 3222 through a portion of the workpiece 60 shielded, and the light and dark edge positions of the light reaching the second CMOS sensor 3221 are checked, so that the value B can be calculated. Meanwhile, a perpendicular distance, that is, a value of C, from an outermost side of the first light source 3111 emitting parallel light to an outermost side of the second light source 3211 emitting parallel light may be measured. The diameter of the workpiece 60 can be obtained by calculating the equation D-C-a-B, the minimum radius and the maximum radius of the workpiece 60 can be obtained, and the roundness of the workpiece 60 can be obtained by calculating the difference between the maximum radius and the minimum radius. In addition, even if the position of the center of the circle of the workpiece 60 is slightly changed, the diameter and the roundness of the workpiece 60 can be accurately measured by the roundness detection device and the roundness calculation method, and the method is simple, convenient and fast, high in measurement accuracy and small in error.
Further, referring to fig. 1, the first emitter 311 and the first receiver 312 are disposed at the middle of the workpiece 60 in the height direction. The second transmitter 321 and the second receiver 322 are disposed at the middle of the workpiece 60 in the height direction. By disposing the first emitter 311, the first receiver 312, the second emitter 321, and the second receiver 322 at the middle portion of the workpiece 60 in the height direction, the sampled data and the two-dimensional plan view at the middle portion of the workpiece 60 can be obtained, and the diameter and the roundness at the middle portion of the workpiece 60 can be calculated. When the roundness of the middle position of the workpiece 60 is qualified, the roundness of the workpiece 60 is qualified. In addition, by disposing the first emitter 311, the first receiver 312, the second emitter 321, and the second receiver 322 in the middle of the workpiece 60 in the height direction, the accuracy of roundness detection of the workpiece 60 can be ensured.
Specifically, in the present embodiment, the height of the workpiece 60 is 80mm, the distance from the first emitter 311 to the top or bottom of the workpiece 60 is 39mm to 41mm, and the distance from the first receiver 312 to the top or bottom of the workpiece 60 is 39mm to 41 mm. The distance from the second emitter 321 to the top or bottom of the workpiece 60 is 39 mm-41 mm, and the distance from the second receiver 322 to the top or bottom of the workpiece 60 is 39 mm-41 mm.
In one embodiment, the first lens 3122 and the second lens 3222 are both telecentric lenses. Specifically, a telecentric lens images only parallel light. Since the first lens 3122 and the second lens 3222 are telecentric lenses, the imaging magnification does not change, and even if the position between the workpiece 60 and the first lens 3122 or the second lens 3222 changes, the imaging size of the first CMOS sensor 3121 and the second CMOS sensor 3221 does not change, thereby ensuring high-precision measurement.
Further, a display is communicatively coupled to the controller 40, and by providing the display and communicatively coupling the display to the controller 40, the display is capable of displaying and recording the measurements of the dimensional measuring assembly 30. Meanwhile, the display can display the three-dimensional perspective view of the workpiece 60, so that a worker can intuitively grasp the three-dimensional perspective view of the workpiece 60 and perform roundness detection operation on the three-dimensional perspective view.
In one embodiment, referring to fig. 1, the driving mechanism 20 includes a reduction motor 21 and a gear assembly 22, and the reduction motor 21 is connected to the rotary table 10 through the gear assembly 22. The speed reducing motor 21 is started, the speed reducing motor 21 drives the rotary worktable 10 to rotate for a circle, and the speed reducing motor 21 is connected with the rotary worktable 10 through the gear assembly 22, so that the workpiece 60 arranged on the rotary worktable 10 slowly rotates for a circle at a uniform speed. In the process that the workpiece 60 rotates slowly at a constant speed, the size measuring assembly 30 samples the workpiece 60 to obtain a plurality of groups of data, the controller 40 draws a two-dimensional plane graph through the plurality of groups of data measured by the size measuring assembly 30, and calculates the diameter and the roundness of the two-dimensional plane graph to obtain the diameter and the roundness of the workpiece 60.
Further, referring to fig. 1, the roundness detection apparatus further includes a fixing frame 50, the fixing frame 50 is provided with a mounting hole, the rotary table 10 is rotatably disposed in the mounting hole, and the size measurement component 30 is disposed on the fixing frame 50. Specifically, the middle of the fixing frame 50 is provided with a mounting hole adapted to the rotary table 10, the rotary table 10 is disposed at the position of the mounting hole, and the driving mechanism 20 can drive the rotary table 10 to rotate in the mounting hole. By providing the mount 50, it is possible to mount the drive mechanism 20 and the size measuring unit 30 to the mount 50.
The dimension measuring unit 30 may be a magnetic induction displacement sensor, and the diameter and the roundness of the workpiece 60 may be measured by the magnetic induction displacement sensor. Of course, the dimension measuring unit 30 is a contact type displacement sensor, and the diameter and roundness of the workpiece 60 are measured by the contact type displacement sensor.
Referring to fig. 1 to 4, fig. 4 shows a working flowchart of a roundness detection method according to an embodiment of the present invention, where the roundness detection method according to an embodiment of the present invention includes:
s1: rotating the standard workpiece for one circle, acquiring multiple groups of sampling data at a certain height position of the standard workpiece, obtaining a two-dimensional plane graph of the standard workpiece according to the multiple groups of sampling data, and calculating to obtain the diameter of the standard workpiece;
specifically, the driving mechanism 20 drives the standard workpiece to rotate for one circle, and the controller 40 obtains a plurality of sets of sampling data at a certain height position of the standard workpiece, and obtains a two-dimensional plan view of the standard workpiece according to the plurality of sets of sampling data. And calculating any diameter of the two-dimensional plane graph to obtain a maximum radius and a minimum radius, and calculating the difference value of the maximum radius and the minimum radius to obtain the roundness of the standard workpiece.
S2: the measured workpiece rotates for a circle, multiple groups of sampling data at the same height position of the measured workpiece and the standard workpiece are obtained, and a two-dimensional plane graph of the measured workpiece is obtained according to the multiple groups of sampling data;
specifically, the driving mechanism 20 drives the workpiece to be measured to rotate for one circle, and the controller 40 obtains multiple sets of sampling data at the same height position of the workpiece to be measured and the standard workpiece, and obtains a two-dimensional plane diagram of the workpiece to be measured according to the multiple sets of sampling data.
S3: comparing the two-dimensional plane graph of the workpiece to be measured with the two-dimensional plane graph of the standard workpiece, and automatically compensating and correcting multiple groups of sampling data of the workpiece to be measured according to the two-dimensional plane graph of the standard workpiece;
specifically, the controller 40 compares the two-dimensional plan view of the measured workpiece with the two-dimensional plan view of the standard workpiece, and the controller 40 performs automatic compensation and correction on multiple sets of sampling data of the measured workpiece according to the two-dimensional plan view of the standard workpiece to ensure the measurement accuracy, thereby ensuring the accuracy of roundness detection.
S4: and carrying out data acquisition on the two-dimensional plane graph after the compensation and correction of the measured workpiece, calculating to obtain the diameter of the measured workpiece, and further calculating to obtain the roundness of the measured workpiece.
Specifically, the controller 40 performs data acquisition on the two-dimensional plane graph after compensation correction of the measured workpiece, calculates any diameter of the two-dimensional plane graph to obtain a maximum radius and a minimum radius, and calculates a difference between the maximum radius and the minimum radius to obtain the roundness of the measured workpiece.
The roundness detection method comprises the steps of firstly obtaining a plurality of groups of sampling data of the standard workpiece at a certain height position, and obtaining a two-dimensional plane graph of the standard workpiece according to the sampling data. And acquiring multiple groups of sampling data of the workpiece to be measured at the same height position, and obtaining a two-dimensional plane graph of the workpiece to be measured according to the sampling data. The two-dimensional plane graph of the workpiece to be measured is compared with the two-dimensional plane graph of the standard workpiece, multiple groups of sampling data of the workpiece to be measured are automatically compensated and corrected, and the diameter and the roundness of the workpiece to be measured are calculated according to the sampling data after compensation and correction, so that the measurement precision is high, and the error is small.
In one embodiment, the method for performing compensation correction on a plurality of groups of sampling data of a workpiece to be measured comprises the following steps: and eliminating data points with different trends from the two-dimensional plane map of the standard workpiece in the two-dimensional plane map of the measured workpiece, and compensating the data points with the same trend as the two-dimensional plane map of the standard workpiece in the two-dimensional plane map of the measured workpiece. According to the two-dimensional plane graph of the standard workpiece, the sampling data of the measured workpiece are removed and compensated, so that the diameter and roundness measurement accuracy of the measured workpiece is higher, and the error is smaller.
All possible combinations of the technical features of the above embodiments may not be described for the sake of brevity, but should be considered as within the scope of the present disclosure as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (11)
1. A roundness detection method is characterized by comprising the following steps:
rotating the standard workpiece for one circle, acquiring multiple groups of sampling data at a certain height position of the standard workpiece, obtaining a two-dimensional plane graph of the standard workpiece according to the multiple groups of sampling data, and calculating to obtain the diameter of the standard workpiece;
the measured workpiece rotates for a circle, multiple groups of sampling data at the same height position of the measured workpiece and the standard workpiece are obtained, and a two-dimensional plane graph of the measured workpiece is obtained according to the multiple groups of sampling data;
comparing the two-dimensional plane graph of the measured workpiece with the two-dimensional plane graph of the standard workpiece, and automatically compensating and correcting multiple groups of sampling data of the measured workpiece according to the two-dimensional plane graph of the standard workpiece; the method for compensating and correcting the multiple groups of sampling data of the tested workpiece comprises the following steps: removing data points with different trends from the two-dimensional plane map of the standard workpiece in the two-dimensional plane map of the measured workpiece, and compensating the data points with the same trend as the two-dimensional plane map of the standard workpiece in the two-dimensional plane map of the measured workpiece;
and carrying out data acquisition on the two-dimensional plane graph after the compensation and correction of the measured workpiece, calculating to obtain the diameter of the measured workpiece, and further calculating to obtain the roundness of the measured workpiece.
2. The roundness detection method according to claim 1, wherein in the step of calculating the diameter of the standard workpiece and the diameter of the workpiece to be detected, the method specifically comprises the steps of:
the first light source emits strip-shaped parallel light to irradiate one side of the workpiece, and the second light source emits strip-shaped parallel light to irradiate the other side of the workpiece;
acquiring a C value, wherein the C value is a vertical distance value between the outermost side of the parallel light emitted by the first light source and the outermost side of the parallel light emitted by the second light source;
obtaining an A value, wherein the A value is the minimum value of the vertical distance between the outermost side of the parallel light emitted by the first light source and the workpiece;
acquiring a B value which is the minimum value of the vertical distance between the outermost side of the parallel light emitted by the second light source and the workpiece;
and calculating C-A-B to obtain the diameter of the workpiece.
3. The roundness detection method according to claim 2, wherein the step of calculating the roundness of the workpiece to be detected specifically includes the steps of:
acquiring the minimum radius and the maximum radius of a two-dimensional plane graph of a measured workpiece;
and calculating the difference between the maximum radius and the minimum radius to obtain the roundness of the measured workpiece.
4. A roundness detection apparatus that employs the roundness detection method according to any one of claims 1 to 3, comprising:
a rotary table for mounting a workpiece;
the driving mechanism is used for driving the rotary worktable to rotate;
the measuring mechanism comprises a size measuring assembly, a display and a controller, the controller is respectively in communication connection with the size measuring assembly and the display, the size measuring assembly is used for sampling and measuring multiple groups of data of the workpiece at a certain height, and the controller can draw a two-dimensional plane graph through the data and calculate the diameter and the roundness of the workpiece.
5. The roundness detection apparatus of claim 4 wherein the dimension measuring assembly includes a first sensing member and a second sensing member, the first sensing member being disposed on one side of the workpiece, the second sensing member being disposed opposite the other side of the workpiece.
6. The roundness detection apparatus according to claim 5, wherein the first sensing member is disposed in parallel with the second sensing member.
7. The roundness detection apparatus according to claim 5 or 6, wherein the first sensing member includes a first emitter for being disposed on one side of the workpiece and a first receiver for being oppositely disposed on the other side of the workpiece; the first emitter comprises a first light source, the first receiver comprises a first CMOS sensor and a first lens connected with the first CMOS sensor through an interface, and light emitted by the first light source can be projected on the first lens after being shielded by the workpiece.
8. The roundness detection apparatus according to claim 7, wherein the second sensing member includes a second transmitter and a second receiver, the second transmitter being adapted to be disposed on one side of the workpiece, the second receiver being adapted to be disposed on the other side of the workpiece; the second transmitter comprises a second light source, the second receiver comprises a second CMOS sensor and a second lens connected with the second CMOS sensor through an interface, and light emitted by the second light source can be projected on the second lens after being shielded by the workpiece.
9. The roundness detection apparatus according to claim 8, wherein the first transmitter and the first receiver are adapted to be provided at a middle portion in a height direction of the workpiece, and the second transmitter and the second receiver are adapted to be provided at a middle portion in a height direction of the workpiece.
10. The roundness detection apparatus according to any one of claims 4 to 6, wherein the drive mechanism includes a reduction motor and a gear assembly, and the reduction motor is connected to the rotary table through the gear assembly.
11. The roundness detection apparatus according to any one of claims 4 to 6, further comprising a fixing frame, wherein the fixing frame is provided with a mounting hole, the rotary table is rotatably provided in the mounting hole, and the dimension measurement unit is provided in the fixing frame.
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