CN209961177U - Device for measuring cylindricity of inner hole - Google Patents
Device for measuring cylindricity of inner hole Download PDFInfo
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- CN209961177U CN209961177U CN201920849753.8U CN201920849753U CN209961177U CN 209961177 U CN209961177 U CN 209961177U CN 201920849753 U CN201920849753 U CN 201920849753U CN 209961177 U CN209961177 U CN 209961177U
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Abstract
The utility model relates to a device for measuring hole cylindricity, utilize the utility model discloses a device for measuring hole cylindricity detects the measured hole of the work piece under test, through first testing rod, second testing rod and third testing rod detect at different measurement cross sections and draw the measured value and calculate the circularity error of being surveyed the hole on measuring the cross section, and measure the first testing rod of cross section department according to every, the second testing rod, the straightness accuracy error that draws the hole central line under test is calculated to third testing rod and tilt sensor's measured value, just can calculate the cylindricity error that draws the hole under test according to the straightness accuracy error that each measurement cross section that draws on the roundness error reaches the hole central line under test. Therefore, the utility model discloses a device for measuring hole cylindricity and application method thereof can conveniently detect the hole parameter of work piece.
Description
Technical Field
The utility model relates to a device for measuring hole cylindricity belongs to on-line measuring technical field.
Background
In the process of precisely machining the inner hole of the round hole workpiece, the cylindricity error of the inner hole is an important performance index of a manufacturing process, and in order to ensure the machining precision, the cylindricity error of the inner hole needs to be detected on line. Because the inner aperture of the circular hole workpiece is usually small, generally 10 mm to tens of mm, a conventional online detection instrument cannot extend into the inner hole, so that the measurement is difficult.
At present, cylindricity instruments or three-coordinate measuring instruments are mostly adopted for detecting the cylindricity of round hole workpieces, but 2 people are commonly used for detecting the cylindricity in a laboratory, and the online detection of an industrial field cannot be realized. Therefore, a high-precision online measuring method for the cylindricity of the round hole workpiece needs to be developed, and the rapid field measurement of the cylindricity of the round hole workpiece is realized.
The CN207095512U patent discloses an inner hole cylindricity detecting device, which has a detecting rod extending into the inner hole, a positioning system for positioning the depth extending into the inner hole, and a displacement detecting device on the detecting rod for detecting the radial displacement of the inner hole to compensate the radial straightness error of the guide rail caused by axial feeding. However, the method neglects the guide rail pitch angle motion error introduced by axial feeding, and the error can directly influence the guide rail radial displacement error, thereby reducing the detection precision.
The CN103822593B patent discloses that two mutually perpendicular light paths are formed by utilizing a spectroscope, the translation and inclination errors of a vertical lifting mechanism are respectively detected based on 2 photoelectric sensors, then the measured inner hole profile data is corrected, and the higher measurement precision is achieved through error compensation. However, the 2 displacement sensors mounted on the probe mechanism cannot obtain a highly accurate roundness measurement result in the case of eccentric motion. In addition, the realization principle and the device of the measurement are complex, and the device is only suitable for measuring large-size workpieces with good field environment and large inner apertures.
The CN107063158B patent discloses a method for measuring diameter and cylindricity of an elongated inner hole based on error separation of double sensors. And (3) a standard ring gauge is used as a calibration piece to be sleeved on the double-sensor measuring head, and a first harmonic elimination approximation method is adopted to calibrate the double-sensor measuring head. The inner hole of a workpiece to be measured is sleeved on a double-sensor measuring head, the scanning measurement is carried out on the inner hole in the axial direction and the circumferential direction of the inner hole section by section and in the whole circumference, the calculation and the separation of the linear feeding error at each section are realized by respectively solving the average value and making the difference of the distance measurement data of the two sensors at each section, the eccentric error separation of each section is combined, the outline of the inner hole to be measured is restored, and the cylindricity calculation is carried out by utilizing the cylindricity evaluation method. However, the method needs to select a high-precision rotary worktable to implement detection, and the cost of field detection is increased. Meanwhile, for the precision requirement, under the condition that the rotation error of the rotary worktable is in one grade, the rotation error of the worktable is not negligible, and the method cannot be used.
SUMMERY OF THE UTILITY MODEL
In view of the above-mentioned shortcomings of the prior art, an object of the present invention is to provide a device for measuring the cylindricity of an inner hole, which can conveniently detect the inner hole parameters of a workpiece.
In order to achieve the above object, the utility model provides a device for measuring hole cylindricity adopts following technical scheme: a device for measuring the cylindricity of an inner hole comprises a lifting platform, wherein a rotating platform is arranged on the lifting platform and used for bearing a workpiece to be measured, when the workpiece to be measured is arranged on the rotating platform, the opening of the inner hole of the workpiece to be measured is upward, a detection assembly is arranged above the rotating platform and fixedly arranged, and the detection assembly is used for extending into the inner hole of the workpiece to be measured for detection; the lifting platform is provided with an inclination angle sensor for detecting inclination angle change in the lifting process of the lifting platform;
the detection assembly comprises a first detection rod, a second detection rod and a third detection rod, the first detection rod is provided with an A detection point and an A 'detection point, the distance of the A detection point and the A' detection point is D along the height direction, the second detection rod is provided with a B detection point, the third detection rod is provided with a C detection point, the A detection point, the B detection point and the C detection point are located at the same height position, and the A detection point, the A 'detection point, the B detection point and the C detection point are used for detecting the distance between the A detection point, the A' detection point, the B detection.
Preferably, the first detection rod, the second detection rod and the third detection rod face different positions of the inner wall of the detected inner hole respectively.
Preferably, the detection point A is positioned on a perpendicular bisector of the detection points B and C.
With the utility model discloses a device for measuring hole cylindricity correspondingly, the utility model discloses still provide a use method for measuring device of hole cylindricity, utilize above-mentioned technical scheme or its arbitrary preferred technical scheme device for measuring hole cylindricity carry out the operation, including following operation step:
1) mounting the workpiece to be detected on a rotating platform, and enabling a detection assembly to extend into a certain measuring section position in a detected inner hole of the workpiece to be detected;
2) recording the measurement values of a detection point A and a detection point A' in the static state of the workpiece to be measured, and recording the measurement value of the tilt sensor;
3) the rotating platform rotates by a step angle theta, the measured values of the first detection rod, the second detection rod and the third detection rod are recorded at the position at each interval of the theta angle, and the roundness error of the measured inner hole on the measured section is calculated according to the obtained measured values;
4) moving the lifting platform to another measuring section by a step length s;
5) repeating the steps 2) to 4) to obtain the measured values of the first detection rod, the second detection rod, the third detection rod and the inclination angle sensor at a plurality of measuring sections of the workpiece to be measured;
6) calculating the straightness error of the central line of the inner hole to be measured according to the measurement values of the first detection rod, the second detection rod, the third detection rod and the inclination angle sensor at each measurement section;
7) and calculating to obtain the cylindricity error of the inner hole to be measured according to the roundness error obtained in the step 3) and the straightness error obtained in the step 6).
Preferably, in the step 3), the roundness error of the measured inner hole on the measured section is calculated by adopting the following method:
31) at the measured section of the measured inner hole, the measured values of the first, second and third test bars are set as m1, m2, m3, respectively, and expressed as:
wherein, X0，Y0The coordinate of a central point O of the measured section is alpha, the included angle between a connecting line from the first detection rod to the O and a connecting line from the second detection rod to the O, beta, the included angle between a connecting line from the second detection rod to the O and a connecting line from the third detection rod to the O, theta, the step angle of the rotation of the rotating platform and P, the roundness error of the measured section;
32) carrying out Fourier transform after discretizing the equation in the step 31), and then carrying out inverse Fourier transform after time delay phase shift:
where W (n) is a harmonic weighting function,
and obtaining the roundness error of the measured inner hole on the measured section.
Preferably, in the step 6), the straightness error of the measured inner hole center line is calculated by adopting the following method:
61) the distance between the detection point A and the detection point A' on the first detection rod is D, and the measurement value v of the detection point A is measured in the process that the first detection rod scans the contour line of the inner wall of the inner hole to be detected1And the measured values v of the A' detection points2Can be expressed by the following formula:
wherein f is the straightness error of the contour line passing through the inner wall of the inner hole to be measured and corresponding to the position between the detection point A and the detection point A', and S isxIs a horizontal translation error when the lifting platform moves up and down, phi is an inclination angle sensorMeasured values, subtracting the above equation yields:
v2(z)-v1(z)-D·sin(φ)＝f(z+D)-f(z)
62) and (3) obtaining a linearity error after performing differential integral approximation on the formula:
wherein s is the length of the step distance of the lifting platform in the scanning process.
Preferably, in the step 1), in an initial state, the detection assembly extends into a measurement cross section position of the lowest end in a measured inner hole of a measured workpiece; in said step 4), the lifting platform is moved upwards by a step length s to another measuring section.
As mentioned above, the utility model relates to a device for measuring hole cylindricity and application method thereof has following beneficial effect: utilize the utility model discloses a device for measuring hole cylindricity detects time measuring to the measured hole of being surveyed the work piece, through first test bar, second test bar and third test bar detect at different measurement cross sections and draw the measured value and calculate the circularity error of being surveyed the hole on measuring the cross section, and measure the first test bar of cross section department according to every, the second test bar, third test bar and inclination sensor's measured value calculates the straightness accuracy error that reachs being surveyed the hole central line, the cylindricity error that reachs being surveyed the hole just can be calculated to the straightness accuracy error that is surveyed the hole central line according to the circularity error on each measurement cross section that reachs and being surveyed the hole central line. Therefore, the utility model discloses a device for measuring hole cylindricity and application method thereof can conveniently detect the hole parameter of work piece.
Drawings
Fig. 1 shows a schematic structural diagram of a device for measuring the cylindricity of an inner hole according to the present invention.
FIG. 2 shows a schematic view of the first, second and third test rods as viewed from the axis of the bore being tested.
Fig. 3 is a flow chart showing a method for using the device for measuring the cylindricity of the inner hole according to the present invention.
Description of the element reference numerals
1 base
2 Stand
3 Cross bar
4 lifting platform
5 rotating platform
6 measured workpiece
7 measured inner hole
8 detection component
9 Dip angle sensor
10 first detecting rod
11 second detection rod
12 third detection rod
Detailed Description
The following description is provided for illustrative purposes, and other advantages and features of the present invention will become apparent to those skilled in the art from the following detailed description.
It should be understood that the structure, ratio, size and the like shown in the drawings attached to the present specification are only used for matching with the content disclosed in the specification, so as to be known and read by those skilled in the art, and are not used for limiting the limit conditions that the present invention can be implemented, so that the present invention has no technical essential meaning, and any structure modification, ratio relationship change or size adjustment should still fall within the scope that the technical content disclosed in the present invention can cover without affecting the function that the present invention can produce and the purpose that the present invention can achieve. Meanwhile, the terms such as "upper", "lower", "left", "right", "middle" and "one" used in the present specification are for convenience of description, and are not intended to limit the scope of the present invention, and changes or adjustments of the relative relationship thereof may be made without substantial technical changes, and the present invention is also regarded as the scope of the present invention.
As shown in fig. 1 to 2, the utility model provides a device for measuring bore cylindricity, including lift platform 4, lift platform 4 is last to be equipped with rotary platform 5, rotary platform 5 is used for bearing measured workpiece 6, and when measured workpiece 6 is installed on rotary platform 5, measured bore 7 opening of measured workpiece 6 is up, rotary platform 5's top is equipped with detection module 8, detection module 8 is fixed to be set up, detection module 8 is used for stretching into measured bore 7 of measured workpiece 6 and detecting; the lifting platform 4 is provided with an inclination angle sensor 9 for detecting inclination angle change in the lifting process of the lifting platform 4;
the detection assembly 8 comprises a first detection rod 10, a second detection rod 11 and a third detection rod 12, the first detection rod 10 is provided with a detection point A and a detection point A 'which are at a distance D along the height direction, the second detection rod 11 is provided with a detection point B, the third detection rod 12 is provided with a detection point C, the detection point A, the detection point B and the detection point C are located at the same height position, and the detection point A, the detection point A', the detection point B and the detection point C are used for detecting respective distances from the inner wall of the detected inner hole 7.
Utilize the utility model discloses a device for measuring hole cylindricity is to being surveyed hole 7 of being surveyed work piece 6 and is examined time measuring, through first measuring stick 10, second measuring stick 11 and third measuring stick 12 measure the cross-section in the difference and draw the measured value and calculate the circularity error of being surveyed hole 7 on measuring the cross-section, and measure the first measuring stick 10 of cross-section department according to every, second measuring stick 11, third measuring stick 12 and inclination sensor 9's measured value and calculate the straightness error that reachs being surveyed hole 7 central line, just can calculate the cylindricity error that reachs being surveyed hole 7 according to the straightness error of the circularity error that each measuring on the cross-section that reachs and being surveyed hole 7 central line. Therefore, the utility model discloses a device for measuring hole cylindricity and application method thereof can conveniently detect the hole parameter of work piece.
The device for measuring the cylindricity of the inner hole has the advantages that the radial data of the inner hole 7 to be measured are collected through the 3 detection rods, the roundness error of the section of the inner hole 7 to be measured is detected, and the straightness error of the inner hole 7 to be measured is detected through the data measured by the detection point A and the detection point A' on the first detection rod 10 and the axial data of the inner hole 7 to be measured, which are collected by the inclination angle sensor 9. And combining the detection results of the roundness error and the straightness error to obtain the cylindricity error of the detected inner hole 7.
In the device for measuring the cylindricity of the inner hole, the first detection rod 10, the second detection rod 11 and the third detection rod 12 are used for respectively measuring the distance between the inner wall of the inner hole 7 to be measured, namely, the point A on the first detection rod 10 measures the distance between the inner wall of the inner hole 7 to be measured and the point A, the point A 'on the first detection rod 10 measures the distance between the inner wall of the inner hole 7 to be measured and the point A', the point B on the second detection rod 11 measures the distance between the inner wall of the inner hole 7 to be measured and the point B, and the point C on the third detection rod 12 measures the distance between the inner wall of the inner hole 7 to be measured and the point C. The tilt sensor 9 measures tilt data of the workpiece 6 under test during rotation. The sensor on the first detection rod 10 is a linear displacement sensor which is provided with a detection point A and a detection point B and can measure and obtain displacement measurement values of 2 points with the interval of D along the height direction on the inner wall of the inner hole 7 to be measured. The sensors on the second detection rod 11 and the third detection rod 12 are point displacement sensors, and displacement measurement values of points corresponding to the detection point B and the detection point C on the inner wall of the detected inner hole 7 can be obtained respectively. The detection point A, the detection point B and the detection point C are positioned at the same height. The measuring axes of the detection point A, the detection point B and the detection point C are intersected at one point, and the measuring axis of each sensor points to the inner wall of the inner hole 7 to be measured.
The utility model discloses an in the device for measuring hole cylindricity, as shown in FIG. 1, it installs on rotary platform 5 to be surveyed work piece 6, rotary platform 5 installs on lift platform 4, lift platform 4 installs on grudging post 2, grudging post 2 is fixed on base 1, be fixed with horizontal pole 3 on the grudging post 2, be connected with determine module 8 on the horizontal pole 3, the in-process that is surveyed work piece 6 rotatory or goes up and down, determine module 8 rigidity, inclination sensor 9 can detect the inclination change of being surveyed work piece 6.
In a preferred embodiment, as shown in fig. 2, the first detecting rod 10, the second detecting rod 11 and the third detecting rod 12 face different positions of the inner wall of the bore 7 to be detected, i.e., a detecting point a and a' on the first detecting rod 10 face the same direction, a detecting point B on the second detecting rod 11 faces the other direction, and a detecting point C on the third detecting rod 12 faces the other direction. More preferably, as shown in fig. 2, the detection point a is located on a perpendicular bisector between the detection point B and the detection point C.
With the utility model discloses a device for measuring hole cylindricity correspondingly, the utility model discloses still provide a use method for measuring device of hole cylindricity, utilize above-mentioned technical scheme or its arbitrary preferred technical scheme device for measuring hole cylindricity carry out the operation, please refer to fig. 1 to fig. 3, include following operation step:
1) mounting the workpiece 6 to be measured on the rotary platform 5, and enabling the detection assembly 8 to extend into a certain measuring section position in the inner hole 7 to be measured of the workpiece 6 to be measured;
2) recording the measurement values of a detection point A and a detection point A' in the static state of the workpiece 6 to be measured, and recording the measurement value of the tilt sensor 9;
3) the rotating platform 5 rotates by a step angle theta, the measured values of the first detection rod 10, the second detection rod 11 and the third detection rod 12 are recorded at the position of every theta angle, and the roundness error of the measured inner hole 7 on the measured section is calculated according to the obtained measured values; when the workpiece 6 to be measured rotates for one circle, 360/theta (assumed to be an integer) groups of displacement sensor measurement values are obtained; when the roundness error of the measured inner hole 7 on the measuring section is calculated, the 3-point method error separation technology can be used for calculation;
4) the lifting platform 4 moves one step length s to another measuring section;
5) repeating the steps 2) to 4) to obtain the measured values of the first detection rod 10, the second detection rod 11, the third detection rod 12 and the inclination angle sensor 9 at a plurality of measuring cross sections of the workpiece 6 to be measured;
6) calculating the straightness error of the central line of the inner hole 7 to be measured according to the measurement values of the first detection rod 10, the second detection rod 11, the third detection rod 12 and the inclination angle sensor 9 at each measurement section; when the straightness error of the central line of the inner hole 7 to be measured is calculated, a mixed 2-point error separation technology can be used for calculation;
7) and calculating to obtain the cylindricity error of the inner hole 7 to be measured according to the roundness error obtained in the step 3) and the straightness error obtained in the step 6).
In order to conveniently and accurately calculate the roundness error in step 3), preferably, in step 3), the roundness error of the measured inner hole 7 on the measured section is calculated by the following method:
31) at the measured section of the bore 7 to be measured, the measured values of the first, second and third test bars 10, 11 and 12 are set to m1, m2 and m3, respectively, expressed as:
wherein, X0，Y0The coordinate of the central point O of the measuring section is alpha, which is an included angle between a connecting line of the first detecting rod 10 to the O and a connecting line of the second detecting rod 11 to the O, beta which is an included angle between a connecting line of the second detecting rod 11 to the O and a connecting line of the third detecting rod 12 to the O, theta which is a step angle of the rotation of the rotating platform 5, and P which is a roundness error of the measuring section;
33) carrying out Fourier transform after discretizing the equation in the step 31), and then carrying out inverse Fourier transform after time delay phase shift:
where W (n) is a harmonic weighting function,
and the roundness error of the measured inner hole 7 on the measured section can be obtained.
In order to conveniently and accurately calculate the straightness error in the step 6), preferably, in the step 6), the straightness error of the central line of the measured inner hole 7 is calculated by adopting the following method:
61) the distance between the detection point A and the detection point A' on the first detection rod 10 is D, and the first detection rod 10 scans the contour line of the inner wall of the detected inner hole 7In the course, the measured value v of the point A is detected1And the measured values v of the A' detection points2Can be expressed by the following formula:
wherein f is the straightness error of the contour line passing through the inner wall of the detected inner hole 7 and corresponding to the position between the detection point A and the detection point A', and S isxThe horizontal translation error of the lifting platform 4 in the up-and-down motion is shown, phi is the measured value of the tilt angle sensor 9, and the above formula is subtracted to obtain:
v2(z)-v1(z)-D·sin(φ)＝f(z+D)-f(z)
63) and (3) obtaining a linearity error after performing differential integral approximation on the formula:
wherein s is the length of the step distance of the lifting platform 4 in the scanning process.
Preferably, in the step 1), in an initial state, the detection assembly 8 extends into the position of the measuring section at the lowest end in the measured inner hole 7 of the measured workpiece 6; in said step 4), the lifting platform 4 is moved upwards by a step length s to another measuring section.
Based on the technical scheme of above-mentioned embodiment, the utility model discloses a device for measuring hole cylindricity and application method thereof can conveniently detect the hole parameter of work piece, the utility model discloses a beneficial effect for measuring device of hole cylindricity and application method thereof lies in:
1) the sensor of the first detection rod 10 adopts a linear displacement sensor with a detection point A and a detection point A' which are distributed along the height direction, and can simultaneously obtain the measurement values of 2 points on the inner wall of the detected inner hole 7 at a certain distance along the axial direction, thereby reducing the complexity of the detection component 8 extending into the detected inner hole 7 and being more suitable for the detected workpiece 6 with smaller inner diameter hole diameter.
2) The inclination angle sensor 9 is used for detecting the inclination angle change of the workpiece in the moving process of the lifting platform 4, so that the axial straightness error of the side wall of the circular hole workpiece is more accurately separated.
3) The detection assembly 8 used in the method is simple and convenient to install, easy to implement and suitable for online cylindricity detection in an industrial field.
To sum up, the utility model discloses various shortcomings in the prior art have effectively been overcome and high industry value has.
The above embodiments are merely illustrative of the principles and effects of the present invention, and are not to be construed as limiting the invention. Modifications and variations can be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which may be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.
Claims (3)
1. A device for measuring the cylindricity of an inner hole is characterized by comprising a lifting platform, wherein a rotating platform is arranged on the lifting platform and used for bearing a workpiece to be measured, when the workpiece to be measured is arranged on the rotating platform, the opening of the inner hole to be measured of the workpiece to be measured is upward, a detection assembly is arranged above the rotating platform and fixedly arranged and used for extending into the inner hole to be measured of the workpiece to be measured for detection; the lifting platform is provided with an inclination angle sensor for detecting inclination angle change in the lifting process of the lifting platform;
the detection assembly comprises a first detection rod, a second detection rod and a third detection rod, the first detection rod is provided with an A detection point and an A 'detection point, the distance of the A detection point and the A' detection point is D along the height direction, the second detection rod is provided with a B detection point, the third detection rod is provided with a C detection point, the A detection point, the B detection point and the C detection point are located at the same height position, and the A detection point, the A 'detection point, the B detection point and the C detection point are used for detecting the distance between the A detection point, the A' detection point, the B detection.
2. The apparatus for measuring the cylindricity of an internal bore of claim 1, wherein: the first detection rod, the second detection rod and the third detection rod face different positions of the inner wall of the inner hole to be detected respectively.
3. The apparatus for measuring the cylindricity of an internal bore of claim 1, wherein: the detection point A is positioned on the perpendicular bisector of the detection point B and the detection point C.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920849753.8U CN209961177U (en) | 2019-06-06 | 2019-06-06 | Device for measuring cylindricity of inner hole |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920849753.8U CN209961177U (en) | 2019-06-06 | 2019-06-06 | Device for measuring cylindricity of inner hole |
Publications (1)
| Publication Number | Publication Date |
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| CN209961177U true CN209961177U (en) | 2020-01-17 |
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| CN201920849753.8U Expired - Fee Related CN209961177U (en) | 2019-06-06 | 2019-06-06 | Device for measuring cylindricity of inner hole |
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| Country | Link |
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| CN (1) | CN209961177U (en) |
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2019
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