Part R angle radius measuring device, method, program, equipment and storage medium

Abstract

The invention provides a part R angle radius measuring device which comprises a semi-arc probe fixing piece erected on a horizontal plane and optical fiber probes, emergent light rays of all the optical fiber probes are coplanar and intersect at one point, emergent light rays of the central optical fiber probe are perpendicular to the horizontal plane, and emergent light rays of the central optical fiber probe are perpendicular to the horizontal plane. By calibrating the distance from each optical fiber probe to the convergent point and the interval angle between each optical fiber probe and the central optical fiber probe, the R angle radius of the to-be-measured part is solved according to the distance measurement value from each optical fiber probe to the to-be-measured part. According to the invention, the sensitivity coefficient of the calculation result of the R angle radius of the part to the measurement point error is reduced, the calculation accuracy of the R angle radius of the part is improved, and the stability of the optical fiber probe in the measurement process is improved through the integrated structure.

Description

Technical Field

[0001] This invention belongs to the field of laser interferometry fiber optic sensing technology application, specifically relating to a part radius measurement device, method, program, equipment and storage medium. Background Technology

[0002] The radius (R) is the circular arc formed when the edge of an object intersects with an adjacent plane. R is a common structure in various parts, and its machining accuracy directly affects the performance of the part. Therefore, R inspection is a crucial step in the part quality inspection process.

[0003] The measurement methods for the radius (R) of a part mainly include contact measurement and non-contact measurement. Contact measurement can easily damage the part, while non-contact measurement does not have this problem. Laser interferometry is a type of non-contact measurement, which has the advantages of small probe size and high precision.

[0004] Laser interferometry can measure the radius (R) of a part to obtain a series of measurement points, from which the radius can be calculated. However, if the interval between measurement points is too small, the sensitivity of the calculated radius to measurement point errors will increase sharply, leading to excessively large calculation errors. Summary of the Invention

[0005] The purpose of this invention is to provide a device, method, program, equipment, and storage medium for measuring the radius of a part's radius (R-angle), thereby improving the accuracy of the R-angle radius calculation by reducing the sensitivity coefficient of the calculated result to measurement point errors.

[0006] A part radius measuring device includes a semi-circular probe fixing component, which is erected on a horizontal plane. An optical fiber probe is installed on the semi-circular probe fixing component. The outgoing light rays of all optical fiber probes are coplanar and intersect at a point. The outgoing light ray of one of the optical fiber probes is perpendicular to the horizontal plane.

[0007] Furthermore, the fiber optic probe is mounted on the semi-circular probe fixture via an adjustable probe clamp, which is used to hold the fiber optic probe and adjust its pitch and yaw.

[0008] Furthermore, it also includes a laser interferometry device for demodulating the return signal received by the fiber optic probe to obtain information on the intensity and distance of the return signal.

[0009] A method for measuring the radius of a part's R-angle includes the following steps:

[0010] Step 1: Calibrate the part's radius of curvature measuring device and obtain the distance from each fiber optic probe to the convergence point. Obtain the spacing angle between each fiber optic probe and the central fiber optic probe. ;

[0011] The central fiber optic probe is a fiber optic probe whose outgoing light rays are perpendicular to the horizontal plane; the convergence point is the intersection of the outgoing light rays from all the fiber optic probes. , This indicates the central fiber optic probe; the total number of fiber optic probes is [number missing]. ;

[0012] Step 2: Place the part to be tested under the semi-circular probe fixing part, and adjust the position of the part to be tested until the return signal intensity of each fiber optic probe is the maximum.

[0013] Step 3: Obtain the distance measurements from each fiber optic probe to the part under test. Solve the matrix :

[0014]

[0015] ,

[0016] in, , This represents the total number of fiber optic probes located on one side of the central fiber optic probe.

[0017] The matrix obtained by solving It is a column vector with 3 elements, i.e. According to the matrix The elements in the calculation are used to determine the radius of the R-angle of the part to be measured. :

[0018]

[0019] Furthermore, the calibration of the part's R-angle radius measuring device in step 1 specifically involves:

[0020] Prepare a rotating reflector and position it below the semi-circular probe mounting bracket, ensuring the reflector is directly opposite the central fiber optic probe and the convergence point is on the reflector. Record this position as the starting position of the rotating reflector. Obtain the distance from the central fiber optic probe to the convergence point based on the reflected light signal from the central fiber optic probe. ;

[0021] Rotate the reflector toward the first The fiber optic probe rotates until the... When the reflected light signal intensity of the fiber optic probe is at its maximum, record the rotation angle of the rotating mirror from its initial position to its current position, as the first... The angle between the fiber optic probe and the central fiber optic probe According to the Acquisition of return signal from fiber optic probe Distance from fiber optic probe to convergence point .

[0022] Furthermore, if the part to be measured has a convex R-angle, then the top of the part to be measured should be higher than the convergence point. , .

[0023] Furthermore, if the part to be measured has a concave radius (R-angle), then the bottom of the part to be measured is lower than the convergence point. , .

[0024] A computer device includes a memory, a processor, and a computer program stored in the memory, wherein the processor executes the computer program to implement the steps of the above-described method for measuring the radius of curvature of a part.

[0025] A computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps of the above-described method for measuring the radius of curvature of a part.

[0026] A computer program product includes computer instructions that, when executed by a processor, implement the steps of the above-described method for measuring the radius of curvature of a part.

[0027] The beneficial effects of this invention are as follows:

[0028] This invention reduces the sensitivity coefficient of the calculated radius of the part's radius to measurement point errors, improves the accuracy of the radius of the part's radius of the ... Attached Figure Description

[0029] Figure 1 This is a schematic diagram of a part radius measuring device according to an embodiment of the present invention.

[0030] Figure 2 This is a schematic diagram of a device for measuring the radius of curvature (R-angle) of a part, as described in an embodiment of the present invention.

[0031] Figure 3 This is a schematic diagram of the measurement of the convex radius (R-angle) in an embodiment of the present invention.

[0032] Figure 4 This is a schematic diagram of the measurement of the concave R-angle in an embodiment of the present invention. Detailed Implementation

[0033] The present invention will now be further described with reference to the accompanying drawings.

[0034] This invention designs a part radius measurement device, including a semi-circular probe fixing component 101, an adjustable probe clamp 102, an optical fiber probe 103, a laser interferometric measurement device 104, and a host computer 105.

[0035] The semi-circular probe holder 101 is used to fix the adjustable probe clamp 102; the adjustable probe clamp 102 is used to hold the fiber optic probe 103 and adjust the pitch and yaw of the fiber optic probe 103; the fiber optic probe 103 is used to emit optical signals and receive the return light signals reflected from the R-angle of the part; the laser interferometry device 104 is used to demodulate the return light signals received by the fiber optic probe 103 to obtain the measurement distance value; the host computer 105 is used to acquire the measurement distance value demodulated by the laser interferometry device 104 and calculate the R-angle radius of the part based on the measurement distance value.

[0036] A method for measuring the radius of a part's R-angle includes the following steps:

[0037] Step 1: Calibrate the part's radius of curvature measuring device and obtain the distance from each fiber optic probe to the convergence point. Obtain the spacing angle between each fiber optic probe and the central fiber optic probe. ;

[0038] The central fiber optic probe is a fiber optic probe whose outgoing light rays are perpendicular to the horizontal plane; the convergence point is the intersection of the outgoing light rays from all the fiber optic probes. , This indicates the central fiber optic probe; the total number of fiber optic probes is [number missing]. ;

[0039] Step 2: Place the part to be tested under the semi-circular probe fixing part, and adjust the position of the part to be tested until the return signal intensity of each fiber optic probe is the maximum.

[0040] Step 3: Obtain the distance measurements from each fiber optic probe to the part under test. Solve the matrix :

[0041]

[0042] ,

[0043] in, , This represents the total number of fiber optic probes located on one side of the central fiber optic probe.

[0044] The matrix obtained by solving It is a column vector with 3 elements, i.e. According to the matrix The elements in the calculation are used to determine the radius of the R-angle of the part to be measured. :

[0045]

[0046] Example 1:

[0047] As shown in Figure 1, in this embodiment, there are three sets of fiber optic probes 103. The semi-circular probe fixing component 101 also includes a base for fixing the semi-circular probe fixing component 101. The radius of the semi-circular probe fixing component 101 is... ,in The width and thickness should not exceed half the radius and should not be less than 3 cm. To ensure that the light emitted from the fiber optic probe 103 illuminates the surface of the component's radius (R-angle) and is reflected back into the fiber optic probe 103, the required spacing angle of the fiber optic probe 103 is... The radius of the semi-circular probe holder 101 must be selected based on the radius of the measured part's R-angle, as it cannot exceed the radius of the part's R-angle. The spacing angle of the fiber optic probe 103... A smaller radius requires a correspondingly larger radius for the semi-circular probe holder 101 to ensure proper mounting of the adjustable probe clamp 102 and the semi-circular probe holder 101. However, increasing the radius leads to a proportional reduction in the light-receiving angle of the fiber optic probe, significantly increasing the difficulty of optical alignment. Therefore, while ensuring the compatibility of the R-angle between the measuring device and the parts, a critical minimum radius value for the semi-circular probe holder 101 is selected to achieve an optimal balance between mechanical compatibility and optical sensitivity. The pigtail of the fiber optic probe 103 is connected to the laser interferometry device 104 via a flange.

[0048] The spacing angle between the fiber optic probes 103 is ,in probe interval angle Sensitivity coefficient of the calculated radius of radius (R) to the measurement point error. The relationship is:

[0049]

[0050] From the above formula, we can see that the spacing angle between the fiber optic probes 103 is... Sensitivity coefficient of the calculated radius of radius (R) to the measurement point error. Inversely proportional. The spacing angle between the fiber optic probes 103 The larger the value, the more sensitive the calculated radius of the radius (R-angle) is to the measurement point error. The smaller the value, the smaller the error in the R-angle radius measurement. (Interval angle) When selecting, the interval angle between the fiber optic probes 103 is used. The principle is to select the critical maximum interval angle based on the radius of the part's radius.

[0051] The laser interferometry equipment 104 is connected to the host computer 105 via a network cable and communicates with it.

[0052] Figure 2 shows the calibration method for the measuring device.

[0053] When the calibration light is emitted perpendicularly, the required device 201 is an adjustable plane mirror. The adjustable plane mirror 201 is adjusted to a horizontal position and placed on the optical platform below the measuring device, with it facing the central probe. The pitch and yaw of the fiber optic probe are adjusted using the adjustable probe clamp to ensure the strongest return signal received by the fiber optic probe from the adjustable plane mirror 201. Then, the positions of the left and right probes are adjusted so that they are coplanar with the central probe. At this point, the perpendicular emission calibration of the fiber optic probe is complete.

[0054] When calibrating the intersection point of the light rays, the required device 201 is a CCD array. The CCD array 201 is adjusted to a horizontal position and placed on the optical platform below the measuring device, with it directly facing the central probe. The position of the light spot formed by the light rays emitted from the central probe is observed on the CCD array 201 display interface. The CCD array 201 is moved until the light spot is centered on the CCD array 201 display interface. Then, the pitch and yaw of the left and right fiber optic probes are adjusted using the adjustable probe clamps so that the light spots formed by the light rays emitted from the left and right probes on the CCD array 201 display interface are also centered on the CCD array 201 display interface and intersect with the light spot formed by the light rays emitted from the central probe. At this point, the calibration of the intersection point of the fiber optic probe light rays is complete.

[0055] When calibrating the distance from the probe to the intersection point and the probe spacing angle, the required device 201 is a rotating mirror. The rotating mirror 201 is adjusted to a horizontal position and placed on the optical platform below the measuring device. The position of the rotating mirror 201 is adjusted so that it faces the intermediate probe and the light intersection point is located on the rotating mirror 201; this position is taken as the starting position of the rotating mirror 201. The distance from the intermediate probe to the rotating mirror 201 is measured using a laser interferometry device, and the measured distance value is used as the calibration value for the distance from the intermediate probe to the intersection point. Rotate the rotating reflector 201 toward the left probe until the reflected light signal from the left probe is strongest. Take this rotation angle as the interval angle between the left and middle probes. The distance from the left probe to the rotating mirror 201 was measured using a laser interferometer, and the measured distance value was used as the calibration value of the distance from the left probe to the intersection point. After returning the rotating reflector 201 to its initial position, rotate it towards the right probe until the reflected light signal from the right probe is strongest. Stop when the rotation angle at this point is taken as the interval angle between the right probe and the middle probe. The distance from the right probe to the rotating mirror 201 was measured using a laser interferometer, and the measured distance value was used as the calibration value of the distance from the right probe to the intersection point. At this point, the calibration of the distance from the probe to the intersection point and the probe interval angle is complete.

[0056] As shown in Figure 3, the convex R-angle 301 is placed horizontally near the intersection of the optical fiber probes. The intensity of the reflected light signal from each optical fiber probe is observed, and the position of the convex R-angle 301 is adjusted to maximize the reflected light signal intensity of each optical fiber probe. The distance from the optical fiber probe to the convex R-angle 301 is measured using a laser interferometry device. The measured distances from the three optical fiber probes from left to right to the convex R-angle 301 are as follows: , , .

[0057] The polar coordinates of the three measurement points from left to right can be obtained as follows: , , Since the measured radius (R) angle is a convex R angle of 30°, therefore... , , .

[0058] Based on the coordinates of the measurement points, three corresponding matrices can be obtained:

[0059] , ,

[0060] Assuming the radius of the convex shape is 30°, the radius is... The rectangular coordinates of the center of the circle are Then the polar equation of the convex shape with an R-angle of 30° can be expressed as:

[0061]

[0062] Substituting matrices A, B, and C into the polar coordinate equation of the convex shape with a radius of 30°, we can obtain:

[0063]

[0064] Solving the system of linear equations above yields the elements of matrix C. , , The value of , then the radius of the convex R-angle 301 .

[0065] As shown in Figure 4, the concave R-angle 401 is placed horizontally near the intersection of the fiber optic probe beams. The intensity of the reflected light signal from each fiber optic probe is observed, and the position of the concave R-angle 401 is adjusted to maximize the reflected light signal intensity of each fiber optic probe. The distance from the fiber optic probe to the concave R-angle 401 is measured using a laser interferometry device. The measured distances from the three fiber optic probes from left to right to the concave R-angle 401 are as follows: , , .

[0066] Specifically, the polar coordinates of the three measurement points from left to right can be obtained as follows: , , Since the measured radius (R) angle is a concave R angle of 40°, therefore... , , .

[0067] Based on the coordinates of the measurement points, three corresponding matrices can be obtained:

[0068] , ,

[0069] Assuming the concave radius is 40°, the radius is... The rectangular coordinates of the center of the circle are Then the polar equation of the concave R-angle 40° can be expressed as:

[0070]

[0071] Substituting matrices A, B, and C into the polar coordinate equation of the concave radius 40°, we obtain:

[0072]

[0073] Solving the system of linear equations above yields the elements of matrix C. , , The value of , then the radius of the concave R-angle 401 .

[0074] This invention effectively reduces the sensitivity of the calculated radius of curvature (R-angle) of a part to measurement point errors by increasing the angle interval between measurement points, thereby improving the accuracy of R-angle calculation. Simultaneously, the integrated structure enhances the stability of the fiber optic probe during measurement. Furthermore, this invention improves measurement accuracy through a series of calibrations of the measuring device, and provides a corresponding R-angle radius calculation method in conjunction with the measuring device.

[0075] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A device for measuring the radius of a part's R-angle, characterized in that: It includes a semi-circular arc probe holder, which stands vertically on a horizontal plane. An optical fiber probe is installed on the semi-circular arc probe holder. The emitted rays of all optical fiber probes are coplanar and intersect at a point. The emitted ray of one of the optical fiber probes is perpendicular to the horizontal plane.

2. The part radius measuring device according to claim 1, characterized in that: The fiber optic probe is mounted on a semi-circular probe holder via an adjustable probe clamp. The adjustable probe clamp is used to hold the fiber optic probe and adjust its pitch and yaw.

3. The part radius measuring device according to claim 1, characterized in that: It also includes laser interferometry equipment, used to demodulate the return signal received by the fiber optic probe and obtain information on the intensity and distance of the return signal.

4. A method based on the part radius measuring device according to claim 1, characterized in that: Step 1: Calibrate the part's radius of curvature measuring device and obtain the distance from each fiber optic probe to the convergence point. Obtain the spacing angle between each fiber optic probe and the central fiber optic probe. ; The central fiber optic probe is a fiber optic probe whose outgoing light rays are perpendicular to the horizontal plane; the convergence point is the intersection of the outgoing light rays from all the fiber optic probes. , This indicates the central fiber optic probe; the total number of fiber optic probes is [number missing]. ; Step 2: Place the part to be tested under the semi-circular probe fixing part, and adjust the position of the part to be tested until the return signal intensity of each fiber optic probe is the maximum. Step 3: Obtain the distance measurements from each fiber optic probe to the part under test. Solve the matrix : ， in, , This represents the total number of fiber optic probes located on one side of the central fiber optic probe. The matrix obtained by solving It is a column vector with 3 elements, i.e. According to the matrix The elements in the calculation are used to determine the radius of the R-angle of the part to be measured. : 。 5. The method for measuring the radius of a part's R-angle according to claim 4, characterized in that: The calibration of the part's radius measuring device in step 1 specifically involves: Prepare a rotating reflector and position it below the semi-circular probe mounting bracket, ensuring the reflector is directly opposite the central fiber optic probe and the convergence point is on the reflector. Record this position as the starting position of the rotating reflector. Obtain the distance from the central fiber optic probe to the convergence point based on the reflected light signal from the central fiber optic probe. ; Rotate the reflector toward the first The fiber optic probe rotates until the... When the reflected light signal intensity of the fiber optic probe is at its maximum, record the rotation angle of the rotating mirror from its initial position to its current position, as the first... The angle between the fiber optic probe and the central fiber optic probe According to the Acquisition of return signal from fiber optic probe Distance from fiber optic probe to convergence point .

6. The method for measuring the radius of a part's R-angle according to claim 4, characterized in that: If the part to be measured has a convex radius (R-angle), then the top of the part to be measured should be higher than the convergence point. , .

7. The method for measuring the radius of a part's R-angle according to claim 4, characterized in that: If the part to be measured has a concave radius (R-angle), then the bottom of the part to be measured should be lower than the convergence point. , .

8. A computer device, comprising a memory, a processor, and a computer program stored in the memory, characterized in that: The processor executes the computer program to implement the steps of the method according to any one of claims 4 to 7.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that: When executed by a processor, the computer program implements the steps of the method according to any one of claims 4 to 7.

10. A computer program product comprising computer instructions, characterized in that: When executed by a processor, the computer instructions implement the steps of the method according to any one of claims 4 to 7.

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