Method for inspecting a bore of an elongated shaft

Abstract

The application discloses the technical field of long shaft part detection technology, and discloses a long shaft inner hole detection method, the long shaft inner hole is detected through the detection tool, and a curve graph and a radar graph are made according to the position corresponding to the detection value A, the eccentric direction and the internal size of the long shaft inner hole can be clearly seen through the curve graph and the radar graph, the correction position and the correction amount of the long shaft can be quickly determined, so that the long shaft part with unqualified size can be corrected, the production cost is reduced, the problem of starting from nothing is solved, and the overall device structure is simple, the use difficulty and the use cost are low, and the device is easy to popularize.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of detection of an elongated shaft, and particularly to an elongated shaft inner hole detection method. BACKGROUND

[0002] With the continuous innovation of an aero-engine, a new type of engine generates an elongated shaft part. The elongated shaft transmits torque at a high speed, and its inner hole also bears the function of torque measurement. Therefore, the inner hole precision is extremely high. Before the aero-engine transmission shaft, the profile is large, the length is short, and the torque measurement shaft is located outside the transmission shaft. There is no precision requirement for the inner hole of the transmission shaft.

[0003] The torque measurement shaft of the elongated shaft part is located inside the inner hole of the elongated shaft. In order to ensure that the torque measurement shaft rotates flexibly inside the elongated shaft at a high speed, the inner hole of the elongated shaft has a high precision requirement. Meanwhile, the elongated shaft is long, and the inner hole and the outer circle have small diameters. The machining is difficult during production, and the qualified rate is low. The current detection method cannot be applied to the detection of the elongated shaft part. Therefore, the elongated shaft part cannot be effectively corrected, and the production cost is high.

[0004] Based on this, the present application designs an elongated shaft inner hole detection method to solve the above problems. SUMMARY

[0005] To achieve the above object, the present application provides the following technical scheme: an elongated shaft inner hole detection method, which adopts a detection tool to detect the inner hole of the elongated shaft. The detection tool includes a support seat and a detection rod.

[0006] The first end of the detection rod is provided with a measuring device and a detection point. The first end of the detection rod is used to extend into the inner hole of the elongated shaft to measure the distance between the detection point and the inner hole wall surface through the measuring device.

[0007] The support seat is used to place and position the elongated shaft, and can move relative to the detection rod.

[0008] The elongated shaft inner hole detection method includes the following steps:

[0009] Step one, place the elongated shaft on the support seat and make the first end of the detection rod pass through the inner hole of the elongated shaft. The support seat is provided with two support seats for supporting the two ends of the elongated shaft. The positions of the two ends of the elongated shaft for contacting the support seat are defined as the outer circle reference A and the outer circle reference B, respectively.

[0010] Step two, move the two support seats along the axial direction of the detection rod as the moving path, keep the elongated shaft stationary relative to the support seats, measure the distance between the detection point of the detection rod and the inner hole wall of the elongated shaft at intervals of distance L during the moving process and read the detection value A, draw the curve of the detection value A with the moving distance of the elongated shaft as the horizontal coordinate and the size of the detection value A as the vertical coordinate;

[0011] Step three, restore the support seats to the position in step one, rotate the elongated shaft with the axial center of the elongated shaft as the rotation axis, rotate by an angle of m° at a time, repeat step two after each rotation until the elongated shaft rotates one round around its axial center;

[0012] Step four, make the radar chart with the size of the detection value A as the axis and the detection value A with the same distance to the first end or the second end of the elongated shaft in the length direction of the elongated shaft as the data points;

[0013] Step five, when the detection value A of the inner hole of the elongated shaft is within the error range, the elongated shaft is qualified, and when the detection value A of the inner hole of the elongated shaft is out of the error range, determine the correction position and the correction value of the elongated shaft according to the curve or / and the radar chart and correct the elongated shaft, and repeat steps one to four after the correction.

[0014] As a further scheme of the present application, in step five, the step of determining the correction position and the correction value of the elongated shaft according to the curve or / and the radar chart comprises:

[0015] S51, calculate the straightness of the inner hole of the elongated shaft through the curve, when the straightness of the inner hole of the elongated shaft is out of the error range, select the maximum value from all the detection values A, and take the position corresponding to the maximum detection value A on the inner hole wall of the elongated shaft as the correction position, and the correction value is the difference between the highest point A and the designed size of the inner hole of the elongated shaft;

[0016] S52, calculate the run-out value of the inner hole of the elongated shaft relative to the outer circle reference A and the outer circle reference B through the radar chart, when the run-out value is out of the error range, correct the outer circle reference A according to the radar chart corresponding to the position of the outer circle reference A, correct the outer circle reference B according to the radar chart corresponding to the position of the outer circle reference B, and take the offset direction of the detection value A in the radar chart as the correction position.

[0017] As a further scheme of the present application, in step S51, subtract the minimum detection value A from the maximum detection value A in the same curve, and compare the difference values obtained in all the curves, and the maximum difference value is the straightness of the inner hole of the elongated shaft.

[0018] As a further scheme of the present application, in step S52, subtract the minimum detection value A from the maximum detection value A in the same radar chart, and the maximum difference value in all the radar charts is the run-out value of the inner hole of the elongated shaft relative to the outer circle reference A and the outer circle reference B.

[0019] As a further scheme of the present application, in step five, when correcting the slender shaft, the correction position needs to be rotated to the highest point, pressure is applied on the corresponding outer circle, and is kept for more than 1 hour.

[0020] As a further scheme of the present application, in step three, before rotating the slender shaft, a mark line is drawn on the surface of the slender shaft to determine the rotation angle of the slender shaft.

[0021] As a further scheme of the present application, in step one, before placing the slender shaft on the support seat 1, the position of the support seat is calibrated by a standard part, and the calibration method of the support seat is as follows:

[0022] S11, the standard part is placed on the support seat, and the first end of the detection rod is arranged in the inner hole of the standard part;

[0023] S12, the two support seats are moved along the axial direction of the detection rod, and the distance between the detection point and the inner hole wall surface of the standard part is continuously read, if the difference between the detection value A and the design value is not more than 0.001mm during the whole moving process, the calibration of the support seat 1 is completed, if the difference between the detection value A and the design value exceeds 0.001mm, step S13 is performed;

[0024] S13, the height position of the support seat is adjusted, the single adjustment amount is 0.01-0.02mm, and step S12 is performed again after the adjustment is completed.

[0025] As a further scheme of the present application, in step three, m is a divisor of 360.

[0026] As a further scheme of the present application, the detection tool further comprises a mounting table and a base slidingly arranged on the mounting table, the second end of the detection rod is fixedly arranged on the mounting table, and the support seat is mounted on the base to realize the sliding cooperation with the mounting table.

[0027] As a further scheme of the present application, a sliding rail is fixedly arranged on the mounting table, and a sliding groove corresponding in position is arranged on the bottom surface of the base and slidingly cooperates with the sliding rail.

[0028] The present application has the following beneficial effects:

[0029] The present application detects the inner hole of the slender shaft by the detection tool, and makes a curve graph and a radar graph according to the position corresponding to the detection value A, the eccentric direction and the internal size of the inner hole of the slender shaft can be clearly seen through the curve graph and the radar graph, the correction position and the correction amount of the slender shaft can be quickly determined, the slender shaft parts with unqualified size can be corrected, the production cost is reduced, the problem of starting from nothing is solved, the overall device structure is simple, the use difficulty and the use cost are low, and the present application is easy to popularize.

[0030] In addition to the above described objects, features and advantages, the present application has other objects, features and advantages. These will become apparent from the following detailed description of the application, when considered in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF DRAWINGS

[0031] The accompanying drawings, which form a part of this specification, are included to provide a further understanding of the application and are incorporated by reference herein. The drawings are not intended to limit the application in any way.

[0032] Figure 1 For the curve in the embodiment of the present application Figure 1 .

[0033] Figure 2 For the curve in the embodiment of the present application Figure 2 .

[0034] Figure 3 For the curve in the embodiment of the present application Figure 3 .

[0035] Figure 4 For the curve in the embodiment of the present application Figure 4 .

[0036] Figure 5 For the radar in the embodiment of the present application Figure 1 .

[0037] Figure 6 For the radar in the embodiment of the present application Figure 2 .

[0038] Figure 7 For the schematic diagram of the detection tool in the present application.

[0039] Figure 8 For the schematic diagram of the measuring device in the present application.

[0040] Figure 9 For the schematic diagram of the detection tool in the present application.

[0041] Figure 10 For the flow chart of the detection method in the present application.

[0042] LEGEND

[0043] 1, support seat; 2, detection rod; 21, measuring device; 22, detection point; 3, mounting table; 31, slide rail; 4, base; 41, sliding groove. DETAILED DESCRIPTION

[0044] The embodiments of the present application will be described in detail below with reference to the accompanying drawings, but the present application can be implemented in various different ways as defined and covered below.

[0045] Please refer to Figures 1-10The application provides an elongated shaft inner hole detection method, which adopts a detection tool to detect the elongated shaft inner hole, wherein the detection tool comprises a support seat 1 and a detection rod 2;

[0046] The first end of the detection rod 2 is provided with a measuring device 21 and a detection point 22, and the first end of the detection rod 2 is used to extend into the elongated shaft inner hole to measure the distance between the detection point 22 and the inner hole wall surface of the elongated shaft through the measuring device 21;

[0047] The support seat 1 is used to place and position the elongated shaft, and can move relative to the detection rod 2;

[0048] The elongated shaft inner hole detection method comprises the following steps:

[0049] Step one: the elongated shaft is placed on the support seat 1, and the first end of the detection rod 2 is arranged in the elongated shaft inner hole, the support seat 1 is provided with two support seats 1, which are used to support the two ends of the elongated shaft, and the positions of the two ends of the elongated shaft used to contact the support seat 1 are defined as outer circle reference A and outer circle reference B respectively;

[0050] Step two: the two support seats 1 are moved along the axial direction of the detection rod 2 as the moving path, the static state of the elongated shaft relative to the support seat 1 is kept, the distance between the detection point 22 of the detection rod 2 and the inner hole wall surface of the elongated shaft is measured at intervals of distance L during the moving process, and the detection value A is read, and the detection value A curve is drawn by taking the moving distance of the elongated shaft and the size of the detection value A as the horizontal coordinate and the vertical coordinate respectively;

[0051] Step three: the support seat 1 is restored to the position of step one, the elongated shaft is rotated around the shaft center as the rotating shaft, the single rotation angle is m° during the rotation, step two is repeated after each rotation, and the elongated shaft is rotated around the shaft center for one circle;

[0052] Step four: the size of the detection value A is taken as the axis, and the detection value A with the same distance from the first end or the second end of the elongated shaft in the length direction of the elongated shaft is taken as the data point to make a radar chart;

[0053] Step five: when the elongated shaft inner hole detection value A is within the error range, the elongated shaft is qualified, and when the elongated shaft inner hole detection value A exceeds the error range, the correction position and the correction value of the elongated shaft are determined according to the curve or / and the radar chart, and the elongated shaft is corrected, and steps one to four are repeated after the correction.

[0054] By inserting the first end of the detection rod 2 into the inner hole cavity of the elongated shaft, and measuring the distance between the detection point 22 on the detection rod 2 and the inner hole wall surface of the elongated shaft through the measuring device 21 on the first end of the detection rod 2, since the position of the detection point 22 on the detection rod 2 is unchanged, the detection rod 2 can detect the detection values A at different positions of the inner hole of the elongated shaft through the measuring device 21 by cooperating with the lateral movement and self-rotation of the elongated shaft around its own axis. By integrating and plotting the different detection values A at different positions, the visualization of the state of the inner hole of the elongated shaft is realized, which facilitates the subsequent correction of the inner hole of the elongated shaft and meets the research and development needs of the special elongated shaft of the new generation of turboshaft engines.

[0055] Specifically, the measuring device 21 adopts a laser ranging device, and the laser receiving point of the laser ranging device is the measurement point.

[0056] Specifically, when reading the detection value A, the detection value A is output by adding the distance between the detection point 22 on the detection rod 2 and the inner hole wall surface of the elongated shaft and the distance between the detection point 22 on the detection rod 2 and the axis of the detection rod 2. The obtained detection value A is the distance between the axis of the detection rod 2 and the inner hole wall surface of the elongated shaft. Alternatively, the detection value A can directly adopt the distance between the detection point 22 on the detection rod 2 and the inner hole wall of the elongated shaft.

[0057] Specifically, in step five, the step of determining the correction position and correction value of the elongated shaft according to the curve graph and / or radar graph includes:

[0058] S51, the straightness of the inner hole of the elongated shaft is calculated through the curve graph. When the straightness of the inner hole of the elongated shaft exceeds the error range, the maximum value is selected from all detection values A, and the corresponding position of the maximum detection value A on the inner hole wall surface of the elongated shaft is taken as the correction position, and the correction value is the difference between the highest point A and the designed size of the inner hole of the elongated shaft. Through step S51, it can be calculated whether the straightness of the inner hole of the elongated shaft is within the error range. When the straightness of the inner hole of the elongated shaft exceeds the error range, the maximum deviation and the deviation value at the corresponding position of the elongated shaft inner hole can be determined through the curve graph, which can provide convenient conditions for subsequent correction of the elongated shaft, so that the subsequent correction of the elongated shaft is more accurate and convenient.

[0059] S52, the runout value of the inner hole of the elongated shaft relative to the outer circle reference A and the outer circle reference B is calculated through the radar graph. When the runout value exceeds the error range, the outer circle reference A is corrected according to the radar graph at the position of the outer circle reference A, the outer circle reference B is corrected according to the radar graph at the position of the outer circle reference B, and the offset direction of the detection value A in the radar graph is taken as the correction position. Through step S52, the runout value of the inner hole of the elongated shaft at different positions relative to the outer circle reference A and the outer circle reference B can be determined, and whether the runout of the inner hole of the elongated shaft relative to the outer circle reference A and the outer circle reference B exceeds the error range can be determined, which can provide convenient conditions for subsequent correction of the elongated shaft, so that the subsequent correction of the elongated shaft is more accurate and convenient.

[0060] Specifically, in step S51, the maximum detection value A in the same graph is subtracted from the minimum value A to obtain a difference value K, and the maximum value K finally obtained in all graphs is the straightness of the elongated shaft hole. The position corresponding to the detection value A in the same graph in the elongated shaft hole is located on a straight line, and the direction of the straight line is the same as the direction of the elongated shaft axis. The straightness of the straight line relative to the elongated shaft axis is the difference K between the maximum detection value A and the minimum value A on the straight line, and the maximum value K in multiple graphs can represent the straightness of the elongated shaft hole.

[0061] Specifically, in step S52, the maximum detection value A in the same radar chart is subtracted from the minimum detection value A, and the obtained value is the runout value of the position corresponding to the elongated shaft hole in the radar chart relative to the outer circle reference A and the outer circle reference B. The runout values calculated from multiple radar charts are compared, and the maximum runout value is taken as the runout of the elongated shaft hole relative to the outer circle reference A and the outer circle reference B to determine whether the runout of the elongated shaft hole is out of tolerance.

[0062] Specifically, in step five, when correcting the elongated shaft, the position to be corrected is rotated to the highest point, pressure is applied on the corresponding outer circle, and maintained for more than 1 hour. We can determine the position to be corrected and the correction value of the elongated shaft through steps S51 and S52. Then, the position to be corrected of the elongated shaft can be rotated to the uppermost position, and pressure is applied on the corresponding position of the outer circle of the elongated shaft hole to be corrected by the correction device and maintained for more than 1 hour to achieve the correction of the elongated shaft. During the correction, the elongated shaft is supported by the support seat 1, and the position of the elongated shaft does not need to be converted to achieve the correction of the elongated shaft, which is more convenient for determining the correction position during the correction.

[0063] Specifically, in step three, before rotating the elongated shaft, mark lines are drawn on the surface of the elongated shaft to determine the rotation angle of the elongated shaft and facilitate the determination of the correction position during the subsequent correction of the elongated shaft.

[0064] Specifically, in step one, before placing the elongated shaft on the support seat 1, the position of the support seat 1 is first calibrated by a standard part, and the calibration method of the support seat 1 is as follows:

[0065] S11, the standard part is placed on the support seat 1, and the first end of the detection rod 2 is arranged in the inner hole of the standard part;

[0066] S12, move the two support seats 1 along the axial direction of the detection rod 2, continuously read the distance between the detection point 22 and the inner hole wall surface of the standard part, if the difference between the distance between the detection point 22 on the detection rod 2 and the inner hole wall surface of the standard part and the designed distance does not exceed 0.001 mm during the entire movement, the calibration of the support seat 1 is completed, if the difference between the distance between the detection point 22 on the detection rod 2 and the inner hole wall surface of the standard part and the designed distance exceeds 0.001 mm, step S13 is performed;

[0067] S13, adjust the height position of the support seat 1, the single adjustment amount is 0.01-0.02 mm, and step S12 is performed again after the adjustment is completed.

[0068] Before detecting the slender shaft, the standard part is used to calibrate the detection tooling to ensure the accuracy of the detection tooling.

[0069] Specifically, in step three, m is a divisor of 360, which uniformly distributes the axes on the radar chart and improves the accuracy of the radar chart.

[0070] Specifically, the detection tooling further comprises a mounting table 3 and a base 4 slidingly arranged on the mounting table 3, the second end of the detection rod 2 is fixedly arranged on the mounting table 3, and the support seat 1 is mounted on the base 4 to realize sliding cooperation with the mounting table 3. By moving the mounting table 3 to drive the plurality of support seats 1 to move synchronously, the relative static state of the slender shaft to the support seat 1 during the movement of the support seat 1 is realized.

[0071] Specifically, a sliding rail 31 is fixedly arranged on the mounting table 3, and a sliding groove 41 corresponding in position is formed in the bottom surface of the base 4 to realize sliding cooperation with the sliding rail 31, so as to ensure the sliding track of the base 4 during sliding.

[0072] As shown in Figure 9 , a convex rib is fixedly arranged on the base 4, and a clamping groove is formed in the bottom of the support seat 1 to cooperate with the convex rib. In step S13, the height of the support seat 1 is adjusted by placing 0.01-0.02 mm racing paper on the top of the convex rib to adjust the high and low positions of the support seat 1.

[0073] As shown in Figure 9 , a V-shaped groove is formed in the top of the support seat 1 to install and center the slender shaft. Embodiment

[0074] The total length of the slender shaft of a certain type of aero-engine is 1.2 m, the outer diameter is 35 mm, the inner hole diameter is 20 mm, the inner hole relative to the outer circle runout requirement is within 0.05 mm, and the straightness requirement is within 0.04 mm;

[0075] In the detection, the measurement starts from the left end of the slender shaft 10 mm, and each 70 mm is measured from left to right, a total of 16 detection values A are measured, and then the slender shaft is rotated 90° around its own axis, and the above measurement steps are repeated;

[0076] The final result is plotted as an axial distance as the abscissa, and the detection value A size as the ordinate to obtain Figures 1-4 From Figures 1-4 we can see that Figure 3 the difference between the maximum detection value A and the minimum detection value A is 0.17 mm, which is Figures 1-4 the maximum difference in Figures 1-4 , so the straightness of the inner hole of the slender shaft in this measurement result is 0.17 mm, which obviously exceeds the error range, so the slender shaft needs to be corrected, and from Figure 3 we can see that the maximum detection value A in all the graphs is located at , the distance from the left end of the slender shaft is 570 mm, and the difference between the maximum detection value A and the design size is 0.17 mm, so when correcting the slender shaft, the correction value is 0.17 mm by applying pressure from the outside of the corresponding position of the correction device;

[0077] The detection value A is plotted in a radar chart, and the detection value A with the same distance from the left end of the slender shaft is plotted as a data point. Due to the large number of radar charts, they will not be displayed one by one here, and only the radar charts of the left and right ends of the slender shaft as shown in Figures 5-6 can be seen. Figure 6 The maximum detection value A and the minimum detection value A in Figures 5-6 reach 0.47 mm, which obviously exceeds the error range of the outer circle runout, so the two ends of the slender shaft need to be corrected according to the radar chart of Figure 5 From Figure 6 we can see that the offset direction of the inner hole of the left end of the slender shaft is mainly angle 2 and angle 3, so the left end of the slender shaft can be corrected between angle 2 and angle 3, and from we can see that the offset direction of the inner hole of the right end of the slender shaft is mainly angle 2, so the slender shaft can be corrected from the direction of angle 2 when correcting the right end of the slender shaft.

[0078] The above only describes the preferred embodiments of the present application and is not used to limit the present application. For those skilled in the art, the present application can have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A method of inspecting a bore of an elongate shaft, characterised by, The application discloses a detection tool for detecting an inner hole of an elongated shaft, which comprises a support base (1) and a detection rod (2). The first end of the detection rod (2) is provided with a measuring device (21) and a detection point (22), and the first end of the detection rod (2) is used for extending into the inner hole of the elongated shaft to measure the distance between the detection point (22) and the inner hole wall surface of the elongated shaft through the measuring device (21). The support base (1) is used for placing and positioning the elongated shaft and can move relative to the detection rod (2). The inner hole detection method of the elongated shaft comprises the following steps: Step one, the elongated shaft is placed on the support base (1), and the first end of the detection rod (2) is arranged in the inner hole of the elongated shaft, the support base (1) is provided with two support bases (1) for supporting two ends of the elongated shaft, and the positions of the two ends of the elongated shaft for contacting the support base (1) are defined as outer circle reference A and outer circle reference B respectively. Step two, the two support bases (1) are moved along the axial direction of the detection rod (2) as the moving path, the elongated shaft is kept in a static state relative to the support base (1), the distance between the detection point (22) of the detection rod (2) and the inner hole wall surface of the elongated shaft is measured at intervals of distance L during the moving process, and a detection value A is read, and a curve graph of the detection value A is drawn by taking the moving distance of the elongated shaft and the size of the detection value A as the horizontal coordinate and the vertical coordinate respectively. Step three, the support base (1) is restored to the position in step one, the elongated shaft is rotated with the shaft center of the elongated shaft as the rotating shaft, the elongated shaft is rotated by m° as the single rotating angle, step two is repeated after each rotation, and the elongated shaft is rotated one circle around the shaft center. Step four, a radar graph is made by taking the size of the detection value A as the axis and the detection value A with the same distance from the first end or the second end of the elongated shaft in the length direction of the elongated shaft as the data points. Step five, when the inner hole detection value A of the elongated shaft is within the error range, the elongated shaft is qualified, and when the inner hole detection value A of the elongated shaft is out of the error range, the correction position and the correction value of the elongated shaft are determined according to the curve graph and / or the radar graph, and the elongated shaft is corrected, and steps one to four are repeated after the correction. In step five, the steps of determining the correction position and the correction value of the elongated shaft according to the curve graph and / or the radar graph comprise the following steps. S51, the straightness of the inner hole of the elongated shaft is calculated through the curve graph, when the straightness of the inner hole of the elongated shaft is out of the error range, the maximum value is selected by comparing all the detection values A, the position corresponding to the maximum detection value A on the inner hole wall surface of the elongated shaft is taken as the correction position, and the correction value is the difference between the highest point A and the design size of the inner hole of the elongated shaft. S52, the runout value of the inner hole of the elongated shaft relative to the outer circle reference A and the outer circle reference B is calculated through the radar graph, when the runout value is out of the error range, the outer circle reference A is corrected according to the radar graph corresponding to the position of the outer circle reference A, the outer circle reference B is corrected according to the radar graph corresponding to the position of the outer circle reference B, and the offset direction of the detection value A in the radar graph is taken as the correction position.

2. The method of claim 1, wherein: In step S51, the maximum detection value A in the same curve graph is subtracted from the minimum detection value A, and the difference values obtained in all the curve graphs are compared, and the maximum difference value is the straightness of the inner hole of the elongated shaft.

3. The method of claim 1, wherein: In step S52, the maximum detection value A in the same radar chart is subtracted from the minimum detection value A, and the maximum difference value among all radar charts is the runout value of the inner hole of the elongated shaft relative to the outer circle reference A and the outer circle reference B.

4. The method of claim 1, wherein: In step five, when correcting the elongated shaft, the correction position needs to be rotated to the highest point, pressure is applied on the corresponding outer circle, and maintained for more than 1 hour.

5. The method of claim 1, wherein: In step three, before rotating the elongated shaft, mark lines are drawn on the surface of the elongated shaft to determine the rotation angle of the elongated shaft.

6. The method of claim 1, wherein: In step one, before placing the elongated shaft on the support seat (1), the position of the support seat (1) is calibrated by a standard part, and the calibration method of the support seat (1) is as follows: S11, the standard part is placed on the support seat (1), and the first end of the detection rod (2) is arranged in the inner hole of the standard part; S12, two support seats (1) are moved along the axial direction of the detection rod (2), and the distance between the detection point (22) and the inner hole wall surface of the standard part is continuously read; if the difference between the detection value A and the design value is not more than 0.001 mm during the whole moving process, the calibration of the support seat (1) is completed; if the difference between the detection value A and the design value exceeds 0.001 mm, step S13 is performed; S13, adjust the height position of the support seat (1), and the single adjustment amount is 0.01-0.02 mm; after adjustment, step S12 is performed again.

7. The method of claim 1, wherein: In step three, m is a divisor of 360.

8. The method of claim 1, wherein: The detection tool further comprises a mounting table (3) and a base (4) slidingly arranged on the mounting table (3), the second end of the detection rod (2) is fixedly arranged on the mounting table (3), and the support seat (1) is mounted on the base (4) to realize sliding cooperation with the mounting table (3).

9. A method of inspecting the bore of an elongate shaft according to claim 8, wherein: The mounting table (3) is fixedly provided with a sliding rail (31), and the bottom surface of the base (4) is provided with a sliding groove (41) corresponding in position and in sliding cooperation with the sliding rail (31).

Images