A calibration device and calibration method for a taper hole automatic measuring device

Abstract

The application discloses a kind of long tube hole automatic measuring device's calibration device and calibration method, the calibration device, including marble base, head base, tail base, linear guide, guide positioning block, slider, support, calibration ring A and calibration ring B.Due to the application adopts double calibration ring calibration, i.e. in the same to be measured cross section position, two different sizes of calibration ring are measured, the equation set is calculated, and the two calibration ring radius and the two measurement values of distance measuring element are used to simultaneously solve the two unknown variables of cantilever value and eccentricity, realize simultaneously calibrating eccentricity and cantilever value, reduce the artificial error generated by traditional calibration, improve the calibration efficiency and stability of measuring device;Since the inner hole of the head base and the tail base of the application has high machining precision, the calibration ring itself also has high precision, and the hole diameter precision is detected and ensured, so as to ensure the reliability of calibration result.

Description

TECHNICAL FIELD

[0001] The present application relates to a kind of taper hole measuring technology, in particular to a kind of calibration device and calibration method of taper hole automatic measuring device. BACKGROUND

[0002] Taper hole exists in various pipe fittings parts with taper angle, taper hole processing is mainly used in gun barrel, aircraft landing gear and other deep hole parts manufacturing.Taper hole automatic measuring device is a kind of measurement technology related to industrial production and processing field, accurate measurement of the size in taper hole is crucial, the size measurement of taper hole usually needs high-precision instrument and professional technical operation, only after the corresponding measuring device is accurately calibrated, measurement operation can be carried out.The accuracy of rotary measuring device cantilever value and eccentricity is the key parameter that affects the accurate measurement of device in the case of installation eccentricity, inaccurate cantilever value calibration will lead to error in hole diameter measurement, the measuring device loses measurement accuracy, resulting in safety hazard in the process of workpiece processing and use.

[0003] At present, the taper hole automatic measuring device in prior art usually uses traditional calibration method, for eccentricity calibration, such as using visual alignment method, cycloid calibration method, scale compensation method, sighting calibration method, etc.;For cantilever value calibration, such as using contact type calibration method, two coordinate difference method, scale method, etc.But traditional calibration method is time-consuming, low in efficiency, and has complicated operation steps, and large human error is prone to occur, traditional calibration method often can only achieve lower calibration accuracy, low integration, cannot calibrate multiple indexes at the same time, and finally cannot guarantee the accuracy of measuring device in actual measurement process.Therefore, before measuring device measures, the related indexes of measuring device must be calibrated. SUMMARY

[0004] To solve the above problems existing in prior art, the present application designs a kind of calibration device and calibration method of taper hole automatic measuring device, which can calibrate cantilever value and eccentricity of measuring device at the same time, improve measurement accuracy, and reduce installation eccentric error.

[0005] In order to achieve the above object, the technical scheme of the present application is as follows: A calibrating device of a conical hole automatic measuring device, comprising a marble base, a head base, a tail base, a linear guide rail, a guide rail positioning block, a sliding block, a support, a calibrating ring A and a calibrating ring B; the marble base is fixed on the ground base, the head base and the tail base are respectively fixedly installed on the left side and the right side of the marble base; the linear guide rail is fixedly installed on the marble base, the left end and the right end of the linear guide rail are respectively in contact with the head base and the tail base, the rear side of the linear guide rail abuts against the strip boss on the marble base, and the front side is pressed and limited by the guide rail positioning block; the sliding block is slidably connected with the linear guide rail and moves left and right along the linear guide rail; the support is fixedly installed on the sliding block, and the calibrating ring A and the calibrating ring B are respectively installed on the left end and the right end of the support and are limited by screws.

[0006] The inner hole diameter D1 of the calibrating ring A is smaller than the inner hole diameter D2 of the calibrating ring B.

[0007] The head base has an inner hole with a diameter equal to the inner hole diameter D2 of the calibrating ring B, and the tail base has an inner hole with a diameter equal to the inner hole diameter D1 of the calibrating ring A.

[0008] The upper part of the cross section of the head base is in the shape of a semicircular ring, and three square grooves are uniformly distributed on the outer side of the upper right end of the head base in the circumferential direction.

[0009] Further, the axes of the inner holes of the head base, the calibrating ring A, the tail base and the calibrating ring B are collinear.

[0010] Further, the strip boss on the marble base is equal in length to the linear guide rail.

[0011] Further, the support is in the structure of a U-shaped groove, a square boss is arranged at the bottom, the square boss is fixedly connected with the sliding block, and the left and right ends of the support are respectively connected with the calibrating ring A and the calibrating ring B through bolts.

[0012] Further, the inner hole diameter of the calibrating ring A is greater than the outer diameter of the shell of the conical hole automatic measuring device, and the outer diameters of the calibrating ring A and the calibrating ring B are the same.

[0013] Further, the guide rail positioning block is in the shape of a nut, and the inner screw hole is a tapered screw hole.

[0014] Further, the head base and the tail base are fixedly installed on the marble base through screws penetrating the marble base.

[0015] A calibrating method of a conical hole automatic measuring device, which is calibrated by using the calibrating device of the conical hole automatic measuring device, and comprises the following steps:

[0016] A. Installation of automatic measuring device for taper hole

[0017] A1. Define the direction of a as the direction of moving towards the head base and the direction of b as the direction of moving towards the tail base on the line connecting the center of the calibration ring A and the center of the calibration ring B; define the direction of c as the direction of moving towards the head base and the direction of d as the direction of moving towards the tail base on the axis direction of the automatic measuring device for taper hole after positioning; define the direction of e as the direction of rotating around the axis.

[0018] Insert the large diameter end of the plug gauge into the inner hole of the head base until it is tightly inserted and cannot be moved, then move the slide block along the direction of a to make the calibration ring A close to the head base, and insert the small diameter end of the plug gauge into the inner hole of the calibration ring A until it is tightly inserted and cannot be moved, read the readings of the two ends respectively, and record the inner hole diameters of the head base and the calibration ring A; then move the calibration ring A along the direction of b, and remove the plug gauge; insert the small diameter end of the plug gauge into the inner hole of the tail base until it is tightly inserted and cannot be moved, move the slide block along the direction of b to make the calibration ring B close to the tail base, and insert the large diameter end of the plug gauge into the inner hole of the calibration ring B until it is tightly inserted and cannot be moved, read the readings of the two ends respectively, and record the inner hole diameters of the tail base and the calibration ring B.

[0019] A2. Place the level on the marble base, and adjust the height of the marble base through the three fixed feet and one height-adjustable foot under the marble base.

[0020] A3. Insert the tail of the automatic measuring device for taper hole from the hole of the head base, and then take it out from the hole of the tail base after placing the shell on the support.

[0021] A4. Turn on the power to make the pneumatic three-jaw chuck of the tail of the automatic measuring device for taper hole expand tightly against the wall of the hole of the tail base, so as to realize the radial centering of the automatic measuring device for taper hole.

[0022] A5. Hook the three manual clamps of the head of the automatic measuring device for taper hole to the square groove of the head base, and pull the handle of the manual clamp to realize the axial positioning of the automatic measuring device for taper hole.

[0023] B. Calibration of automatic measuring device for taper hole

[0024] B1. Drive the straight motor of the automatic measuring device for taper hole to move along the direction of c to move the distance measuring element to the section to be calibrated.

[0025] B2. Manually move the calibration ring A on the support along the linear guide rail to the section to be calibrated.

[0026] B3. Set the number of circumferential measurement points g and the number of rotation measurements n, drive the rotation motor of the automatic measuring device for taper hole to rotate along the direction of e, and measure the section to be calibrated of the calibration ring A for n times to obtain the average measurement value L1.

[0027] B3. Stop measuring, manually move the calibration ring B on the support along the linear guide to the section to be calibrated, set the same number of circumferential measurement points g and the same number of rotation measurements n as when measuring the calibration ring A, and measure the section to be calibrated of the calibration ring B n times to obtain the average measurement value L2;

[0028] B4. Record the inner hole radii of the calibration ring A and the calibration ring B as determined values R1 and R2, record the distance between the zero point position of the distance measuring element of the automatic taper hole measuring device and the rotation axis as the overhang value, the axis of the calibration ring A and the calibration ring B are coaxial, record the distance between the axis and the rotation axis of the automatic taper hole measuring device as the eccentricity, and calculate the overhang value and the eccentricity of different rotation angles of the section to be calibrated using the following equation set, a total of t sections are calibrated, assuming that the section to be calibrated is i, i = 1, 2, 3... t, the average overhang value r i and the average eccentricity e i of the section are calculated, the formula is as follows: i i

[0029]

[0030] B5. When the average overhang value r and the average eccentricity e of the t sections are not measured, go back to step B2 to measure the average overhang value r and the average eccentricity e of the next axial different position section, and when the average overhang value r and the average eccentricity e of the t sections are measured, go to step B6;

[0031] B6. Using the least squares method, a fitting function is used to curve fit the average overhang value r and the average eccentricity e of each section calibrated, and the calibration results are tested and verified.

[0032] Further, the method of testing and verifying in step B6 is as follows:

[0033] The actual observation value is substituted into the fitting function to obtain the fitting value, then the residual between the actual observation value and the fitting value is calculated, and the residual is statistically analyzed; if the residual presents a large fluctuation or has a significant difference, it indicates that the fitting function is inaccurate, i.e. the calibration result has a problem, and if the residual is within the error allowable range, it is determined that the calibration result is accurate.

[0034] Further, the plug gauge is in the shape of a dumbbell, the left and right ends are conical frustums with scales, and the left end size matches the calibration ring A and the right end size matches the calibration ring B.

[0035] Further, the fitting function is a generalized polynomial fitting function, which is represented as follows:

[0036] ​​

[0037] Wherein, x is the measured cross-section Z coordinate, F r (x j ) and F e (x j ) are the output values of cantilever value and eccentricity, respectively, a, b are the polynomial fitting coefficients of cantilever value and eccentricity, respectively, and m is the order.

[0038] Compared with the prior art, the present application has the following beneficial effects:

[0039] 1、The present application can accurately calibrate the eccentricity and cantilever value of the automatic measuring device for conical hole by designing an integrated calibration device, solving the problem of hole diameter measurement error caused by deflection deformation of the overhanging guide rail of the conical hole measuring device, simplifying the operation steps, greatly improving the calibration efficiency and accuracy, and reducing human error.

[0040] 2、The present application uses double calibration rings for calibration, measuring two different size calibration rings at the same measured cross-section position. The number of circumferential measurement points and the number of rotation measurements can be set during the calibration process, and the measurement accuracy and stability are improved by taking the average value through multiple measurements. The design of calibration ring A and calibration ring B makes the calibration process more simple and efficient, improving the measurement device calibration efficiency and stability.

[0041] 3、The present application uses multiple innovative structures in the design to improve the calibration accuracy. The marble base provides a stable reference, the linear guide rail uses the side of the strip boss and the surface of the marble platform as the installation reference surface, ensuring the straightness of the guide rail slider. The plug gauge ensures the coaxiality between the two end bases and the two calibration rings. The cross-section of the two end bases is semicircular in shape, and three square grooves are evenly distributed on the right outer side of the upper part, providing accurate clamping and positioning functions. BRIEF DESCRIPTION OF DRAWINGS

[0042] Figure 1 is a structural schematic diagram of the present application (after installation of the measuring device).

[0043] Figure 2 is a plug gauge detection schematic diagram of the head base hole and calibration ring A of the present application (before installation of the measuring device).

[0044] Figure 3 is a plug gauge detection schematic diagram of the tail base hole and calibration ring B of the present application (before installation of the measuring device).

[0045] Figure 4 is a full sectional view of the present application (after installation of the measuring device).

[0046] Figure 5This is a schematic diagram illustrating the calibration principle of calibration ring A in this invention.

[0047] Figure 6 This is a schematic diagram illustrating the calibration principle of calibration ring B in this invention.

[0048] Figure 7 This is a schematic diagram of the calibration process of the present invention.

[0049] Figure 8 This is a curve of the cantilever value fitted by the third-order generalized polynomial function of the present invention.

[0050] Figure 9 This is a curve of the third-order generalized polynomial function fitting of the eccentricity value of the present invention.

[0051] In the diagram: 1. Marble base; 2. Head base; 3. Linear guide rail; 4. Calibration ring A; 5. Support; 6. Slider; 7. Calibration ring B; 8. Tail base; 9. Automatic tapered hole measuring device; 10. Straight motor; 11. Rotary motor; 12. Distance measuring element; 13. Manual clamp; 14. Plug gauge. Detailed Implementation

[0052] The invention will now be further described with reference to the accompanying drawings. Figures 1-7 As shown, a calibration device for an automatic tapered hole measuring device includes a marble base 1, a head base 2, a tail base 8, a linear guide rail 3, guide rail positioning blocks, a slider 6, a support 5, a calibration ring A4, and a calibration ring B7. The marble base 1 is fixed to a ground foundation. The head base 2 and the tail base 8 are respectively fixedly installed on the left and right sides of the marble base 1. The linear guide rail 3 is fixedly installed on the marble base 1. The left and right ends of the linear guide rail 3 contact the head base 2 and the tail base 8, respectively. The rear side of the linear guide rail 3 abuts against a strip-shaped protrusion on the marble base 1, and the front side is limited by multiple guide rail positioning blocks. The slider 6 is slidably connected to the linear guide rail 3 and moves left and right along the linear guide rail 3. The support 5 is fixedly installed on the slider 6. The calibration ring A4 and the calibration ring B7 are respectively installed at the left and right ends of the support 5 and limited by screws.

[0053] The inner diameter D1 of the calibration ring A4 is smaller than the inner diameter D2 of the calibration ring B7;

[0054] The head base 2 has an inner hole with a diameter equal to the inner hole diameter D2 of the calibration ring B7; the tail base 8 has an inner hole with a diameter equal to the inner hole diameter D1 of the calibration ring A4.

[0055] The upper part of the cross-section of the head base 2 is semi-circular, and three square grooves are evenly distributed along the circumferential direction on the outer side of the upper right end of the head base 2.

[0056] Further, the axes of the inner holes of the head base 2, the inner hole of the calibration ring A4, the inner hole of the tail base 8 and the inner hole of the calibration ring B7 are collinear.

[0057] Further, the strip-shaped boss on the marble base 1 is equal in length to the linear guide rail 3.

[0058] Further, the support 5 is a U-shaped groove structure, and a square boss is arranged at the bottom, and the square boss is fixedly connected with the sliding block 6; the left and right ends of the support 5 are connected with the calibration ring A4 and the calibration ring B7 through bolts respectively.

[0059] Further, the inner hole diameter of the calibration ring A4 is greater than the outer shell diameter of the taper hole automatic measuring device 9; the outer diameters of the calibration ring A4 and the calibration ring B7 are the same.

[0060] Further, the guide rail positioning block is in the shape of a nut, and the inner screw hole is a tapered screw hole.

[0061] Further, the head base 2 and the tail base 8 are fixedly installed on the marble base 1 through the screws penetrating the marble base 1 respectively.

[0062] A method for calibrating a taper hole automatic measuring device, which is calibrated by using a calibration device of the taper hole automatic measuring device, and comprises the following steps:

[0063] A. Install the taper hole automatic measuring device 9

[0064] A1. Define that the direction of moving towards the head base 2 on the line connecting the centers of the calibration ring A4 and the calibration ring B7 is the a direction, and the direction of moving towards the tail base 8 is the b direction; on the axis direction of the positioned taper hole automatic measuring device 9, the direction of moving the distance measuring element 12 towards the head base 2 is the c direction, the direction of moving towards the tail base 8 is the d direction, and the direction of rotating around the axis is the e direction;

[0065] Insert the large-diameter end of the plug gauge 14 into the inner hole of the head base 2 until it is tightly inserted and cannot move, then move the sliding block 6 along the a direction to make the calibration ring A4 close to the head base 2, and insert the small-diameter end of the plug gauge 14 into the inner hole of the calibration ring A4 until it is tightly inserted and cannot move, read the readings of the two ends respectively, and record the inner hole diameters of the head base 2 and the calibration ring A4; then move the calibration ring A4 along the b direction and remove the plug gauge 14; insert the small-diameter end of the plug gauge 14 into the inner hole of the tail base 8 until it is tightly inserted and cannot move, move the sliding block 6 along the b direction to make the calibration ring B7 close to the tail base 8, and insert the large-diameter end of the plug gauge 14 into the inner hole of the calibration ring B7 until it is tightly inserted and cannot move, read the readings of the two ends respectively, and record the inner hole diameters of the tail base 8 and the calibration ring B7;

[0066] A2. Place the level on the marble base 1, and level the marble base 1 by three fixed feet and one height-adjustable foot under the marble base 1;

[0067] A3. Pass the tail of the taper hole automatic measuring device 9 through the head base 2 hole, and then pass it out of the tail base 8 hole after the shell is placed on the support 5;

[0068] A4. Energize the pneumatic three-jaw chuck at the tail of the taper hole automatic measuring device 9 to tighten against the tail base 8 hole wall, and realize the radial centering of the taper hole automatic measuring device 9;

[0069] A5. The three manual clamps 13 of the head of the taper hole automatic measuring device 9 hook and clamp the square groove of the head base 2, and pull the handle of the manual clamp 13 to realize the axial positioning of the taper hole automatic measuring device 9.

[0070] B. Calibration of the taper hole automatic measuring device 9

[0071] B1. Drive the straight motor 10 of the taper hole automatic measuring device 9 to move in the c direction, so that the distance measuring element 12 moves to the section to be calibrated;

[0072] B2. Manually move the calibration ring A4 on the support 5 along the linear guide rail 3 to the section to be calibrated;

[0073] B3. Set the number of circumferential measurement points g and the number of rotation measurements n, drive the rotation motor 11 of the taper hole automatic measuring device 9 to rotate in the e direction, and measure the section to be calibrated of the calibration ring A4 n times to obtain the average measurement value L1;

[0074] B3. Stop the measurement, manually move the calibration ring B7 on the support 5 along the linear guide rail 3 to the section to be calibrated, set the same number of circumferential measurement points g and the number of rotation measurements n as when the calibration ring A4 is measured, and measure the section to be calibrated of the calibration ring B7 n times to obtain the average measurement value L2;

[0075] B4. Record the inner hole radii of the calibration ring A4 and the calibration ring B7 as determined values R1 and R2, respectively, record the distance between the zero point position of the distance measuring element 12 of the taper hole automatic measuring device 9 and the rotation axis as the cantilever value, and record the distance between the axis and the rotation axis of the taper hole automatic measuring device 9 as the eccentricity, calculate the cantilever value and the eccentricity of different rotation angles of the section to be calibrated using the following equation set, and calibrate t sections in total, assuming that the section to be calibrated is i, i = 1, 2, 3,..., t, the average cantilever value r i and the average eccentricity e i of the section are calculated i and the average eccentricity e i of the section are calculated, and the formulas are as follows:

[0076]

[0077] B5. When the average cantilever value r and the average eccentricity e of the t sections are not measured, go to step B2 to measure the average cantilever value r and the average eccentricity e of the next axial different position section; when the average cantilever value r and the average eccentricity e of the t sections are measured, go to step B6;

[0078] B6. Using the least square method, the average cantilever value r and the average eccentricity e of each section calibrated are fitted by a fitting function, and the calibration results are tested and verified.

[0079] Further, the testing and verifying method of step B6 is as follows:

[0080] The actual observation value is substituted into the fitting function to obtain the fitting value, then the residual between the actual observation value and the fitting value is calculated, and the residual is statistically analyzed; if the residual presents a large fluctuation or a significant difference, it indicates that the fitting function is inaccurate, i.e. the calibration result has a problem, if the residual is within the error allowable range, it is determined that the calibration result is accurate.

[0081] Further, the plug gauge 14 is in the shape of a dumbbell, the left and right ends are conical frustums with scales, and the left end size matches the calibration ring A4 and the right end size matches the calibration ring B7.

[0082] Further, the fitting function is a generalized polynomial fitting function, which is expressed as follows:

[0083]

[0084] Wherein, x is the Z coordinate of the measured section, F r (x j ) and F e (x j ) are the output values of the cantilever value and the eccentricity, respectively, a and b are the polynomial fitting coefficients of the cantilever value and the eccentricity, respectively, and m is the order.

[0085] Reference Figure 8 , the curve is a curve diagram of the cantilever value three-order generalized polynomial function fitting, the horizontal axis represents the Z axis coordinate value of the section, the vertical axis represents the cantilever value measurement data, the square point is the actual observation cantilever value, and the curve is the predicted value after fitting, so that the eccentricity value distribution range is between 58.95 and 59.20, the deviation is 0.25, and the fitting effect is good.

[0086] Reference Figure 9The curve is a curve chart of the third-order generalized polynomial function fitting of the eccentricity value, the horizontal axis represents the section Z axis coordinate value, the vertical axis represents the eccentricity value measurement data, the square point is the actual observed eccentricity value, and the curve is the predicted value after fitting. It can be seen that the eccentricity value distribution range is between 0.280 and 0.310, the deviation is 0.03, and the fitting effect is good.

[0087] The present application is not limited to the present embodiment, and any equivalent concept or change within the technical scope disclosed in the present application is included in the protection scope of the present application.

Claims

1. A calibrating device for a device for automatic measurement of a conical hole, characterized in that: The application relates to a marble base (1), a head base (2), a tail base (8), a linear guide rail (3), guide rail positioning blocks, a sliding block (6), a support (5), a calibration ring A (4) and a calibration ring B (7); the marble base (1) is fixed on the ground foundation, the head base (2) and the tail base (8) are respectively fixed and installed on the left side and the right side of the marble base (1), the linear guide rail (3) is fixed and installed on the marble base (1), the left end and the right end of the linear guide rail (3) are respectively in contact with the head base (2) and the tail base (8), the rear side of the linear guide rail (3) is abutted against a strip-shaped boss on the marble base (1), and the front side is extruded and limited by the guide rail positioning blocks; the sliding block (6) is slidably connected with the linear guide rail (3) and moves leftward and rightward along the linear guide rail (3); the support (5) is fixed and installed on the sliding block (6), the calibration ring A (4) and the calibration ring B (7) are respectively installed at the left end and the right end of the support (5) and are limited by screws. The inner hole diameter D1 of the calibration ring A (4) is smaller than the inner hole diameter D2 of the calibration ring B (7). The head base (2) has an inner hole with a diameter equal to the inner hole diameter D2 of the calibration ring B (7); the tail base (8) has an inner hole with a diameter equal to the inner hole diameter D1 of the calibration ring A (4). The upper part of the cross section of the head base (2) is in a semicircular ring shape, and three square grooves are uniformly distributed on the outer side of the upper right end of the head base (2) in the circumferential direction.

2. The calibration device of the automatic measuring device for conical hole according to claim 1, characterized in that: The axes of the inner holes of the head base (2), the calibration ring A (4), the tail base (8) and the calibration ring B (7) are collinear.

3. The calibration device of the automatic measuring device for conical hole according to claim 1, characterized in that: The strip-shaped boss on the marble base (1) has a length equal to that of the linear guide rail (3).

4. The calibration device of the automatic measuring device for conical hole according to claim 1, characterized in that: The support (5) is in a U-shaped groove structure, a square boss is arranged at the bottom, the square boss is fixedly connected with the sliding block (6), and the left end and the right end of the support (5) are connected with the calibration ring A (4) and the calibration ring B (7) through bolts respectively.

5. The calibration device of the automatic measuring device of the conical hole according to claim 1, characterized in that: The inner hole diameter of the calibration ring A (4) is greater than the shell diameter of the automatic taper hole measuring device (9); the outer diameters of the calibration ring A (4) and the calibration ring B (7) are the same.

6. The calibration device of the automatic measuring device of the conical hole according to claim 1, characterized in that: The guide rail positioning block is in a nut shape, and the inner screw hole is a tapered screw hole.

7. The calibration device of the automatic measuring device of the conical hole according to claim 1, characterized in that: The head base (2) and the tail base (8) are fixedly installed on the marble base (1) through the screws penetrating through the marble base (1).

8. A method for calibrating a device for automatically measuring a taper hole, using the device for calibrating a device for automatically measuring a taper hole according to any one of claims 1 to 7, characterized in that: The application further discloses a method for calibrating the automatic taper hole measuring device (9). A. installing the automatic taper hole measuring device (9) A1. defining the connecting line of the center of the calibration ring A (4) and the center of the calibration ring B (7), the direction of moving towards the head base (2) is the a direction, the direction of moving towards the tail base (8) is the b direction; in the axial direction of the positioned automatic taper hole measuring device (9), the direction of moving of the distance measuring element (12) towards the head base (2) is the c direction, the direction of moving towards the tail base (8) is the d direction, and the direction of rotating around the axis is the e direction. Put the large diameter end of the plug gauge (14) into the inner hole of the head base (2) until it is tightly plugged and cannot move, then move the slider (6) in the a direction to make the calibration ring A (4) close to the head base (2), and put the small diameter end of the plug gauge (14) into the inner hole of the calibration ring A (4) until it is tightly plugged and cannot move, read the readings of the two ends respectively, and record the inner hole diameters of the head base (2) and the calibration ring A (4); then move the calibration ring A (4) in the b direction, and remove the plug gauge (14); put the small diameter end of the plug gauge (14) into the inner hole of the tail base (8) until it is tightly plugged and cannot move, move the slider (6) in the b direction to make the calibration ring B (7) close to the tail base (8), and put the large diameter end of the plug gauge (14) into the inner hole of the calibration ring B (7) until it is tightly plugged and cannot move, read the readings of the two ends respectively, and record the inner hole diameters of the tail base (8) and the calibration ring B (7); A2. Place the level on the marble base (1), and adjust the level of the marble base (1) through the three fixed feet and one height-adjustable foot below the marble base (1); A3. The tail of the taper hole automatic measuring device (9) is inserted into the hole of the head base (2), and the shell is placed on the support (5), and then the tail is inserted into the hole of the tail base (8); A4. Turn on the power to expand the pneumatic three-jaw chuck at the tail of the taper hole automatic measuring device (9) to resist the hole wall of the tail base (8) to realize the radial centering of the taper hole automatic measuring device (9); A5. The three manual clamps (13) of the head of the taper hole automatic measuring device (9) hook and clamp the square groove of the head base (2), and the handle of the manual clamp (13) is pulled to realize the axial positioning of the taper hole automatic measuring device (9); B. Calibrate the taper hole automatic measuring device (9) B1. Drive the straight motor (10) of the taper hole automatic measuring device (9) to move in the c direction to move the distance measuring element (12) to the section to be calibrated; B2. Manually move the calibration ring A (4) on the support (5) along the linear guide rail (3) to the section to be calibrated; B3. Set the number of circumferential measurement points g and the number of rotation measurements n, drive the rotation motor (11) of the taper hole automatic measuring device (9) to rotate in the e direction, and measure the section to be calibrated of the calibration ring A (4) n times to obtain the average measurement value L1; B3. Stop measuring, manually move the calibration ring B (7) on the support (5) along the linear guide rail (3) to the section to be calibrated, set the same number of circumferential measurement points g and the number of rotation measurements n as when measuring the calibration ring A (4), and measure the section to be calibrated of the calibration ring B (7) n times to obtain the average measurement value L2; B4. The inner hole radius of the calibration ring A (4) and the calibration ring B (7) is respectively a certain value R1 and R2, the distance between the zero position of the ranging element (12) of the taper hole automatic measuring device (9) and the rotation axis is a cantilever value, the calibration ring A (4) and the calibration ring B (7) are coaxial, the distance between the axis of the calibration ring A (4) and the calibration ring B (7) and the rotation axis of the taper hole automatic measuring device (9) is an eccentricity, the cantilever value and the eccentricity of different rotation angles of the to-be-calibrated section are calculated by using the following equation group, a total of 4 sections are calibrated t i , i =1,2,3..... t , r i e i , the average cantilever value r i and the average eccentricity e i of the section are calculated, and the formulas are as follows:​​ B5. When measurements are not completed t Average cantilever value of each section r and average eccentricity e Then, proceed to step B2 to measure the average cantilever value at different axial positions of the cross-section. r and average eccentricity e After the measurement is completed t Average cantilever value of each section r and average eccentricity e Then, proceed to step B6; B6. Using the principle of least squares, the average cantilever value of each section obtained by calibration r and the average eccentricity e Test and verify the calibration results using curve fitting with a fitting function.

9. The method of calibrating a device for automatically measuring a taper hole according to claim 8, wherein: The test and verification method of step B6 is as follows: Substitute the actual observation value into the fitting function to obtain the fitting value, then calculate the residual between the actual observation value and the fitting value, and statistically analyze the residual; if the residual presents large fluctuations or has obvious differences, it indicates that the fitting function is not accurate, that is, the calibration result has a problem, if the residual is within the error allowable range, it is determined that the calibration result is accurate.

10. The method of calibrating a device for automatically measuring a taper hole according to claim 8, wherein: The fitting function is a generalized polynomial fitting function, which is represented as follows: where x is the measured cross section Z coordinate, F r ( x j ) and F e ( x j ) are the output values of the cantilever value and the eccentricity, respectively, a 、 b are the polynomial fit coefficients of the cantilever value and the eccentricity, respectively, m is the order.

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