Rotationally symmetric non-complete spherical roundness measurement tool and its use method

Abstract

The present invention relates to a tool for measuring the roundness of a rotationally symmetrical non-complete spherical surface and a method for using the tool. In view of the spherical forming characteristics of rotationally symmetrical non-complete spherical parts, the tool is used to measure the roundness error of a circular cross section that passes through the center of the sphere and intersects the equator at the largest possible deflection angle, thereby achieving accurate detection and identification of the spherical accuracy of such parts. The tool belongs to the field of bearing detection technology, wherein the tool comprises a workbench base, an angle adjustment mechanism, an angle locking mechanism, and a sliding workbench. The tool includes a roundness meter workbench, a differential cylinder, a core shaft, a measuring rod, and other components. Through the coordination of the coarse adjustment knob in the angle adjustment mechanism and the differential cylinder, rapid and precise adjustment of the workpiece's tilt angle and the position of the sphere center can be achieved, and the roundness detection cross section that envelops the spherical error as much as possible can be determined, ensuring that the roundness meter's central axis can accurately pass through the workpiece's sphere center. The tool provided by the present invention has a compact structure, flexible adjustment, and high measurement accuracy, overcoming the limitation that traditional roundness meters can only perform horizontal measurements.

Description

Technical Field

[0001] The present invention relates to the field of bearing detection technology, and in particular to a professional roundness measurement tool and a use method, and specifically to a rotationally symmetric non-holosphere roundness measurement tool and a use method. Background Art

[0002] As an important parameter for characterizing the geometric accuracy of rotationally symmetrical parts, roundness has extensive and critical applications in high-end manufacturing fields such as aerospace, automotive manufacturing, precision machinery, and bearings. However, traditional roundness measurement methods for bearing parts are mostly based on the horizontal placement of the workpiece. The workpiece is rotated by the rotating platform of the roundness meter, and the measuring rod is used to collect the contour changes of a certain section, and the roundness error of the measured section is evaluated accordingly. Traditional roundness meters are difficult to directly adapt to the roundness measurement and evaluation of spherical measurement sections with tilted equatorial sections of the spherical surface of the part. In particular, for the detection of spherical errors of rotationally symmetrical non-complete spheres, the measurement capability is limited when measuring tilted sections that pass through the center of the sphere or non-equatorial sections.

[0003] In view of this, how to provide a roundness measurement tool that has a compact structure, strong adjustability, and high measurement accuracy for multi-angle measurement and analysis of roundness has become a technical problem that needs to be urgently solved in the existing technology. Summary of the Invention

[0004] The present invention is dedicated to overcoming the deficiencies of the prior art and provides a multi-angle measurement and analysis roundness meter fixture with compact structure, strong adjustability and high measurement accuracy, as well as a spherical error detection method for rotationally symmetric non-holospheres.

[0005] In one aspect, the present invention provides a rotationally symmetric non-holosphere roundness measurement tool, comprising:

[0006] The roundness meter workbench is used to provide a basic support platform, has an angle dial, and can rotate around the center axis of the roundness meter workbench;

[0007] A workbench base is mounted on the roundness instrument workbench, the central axis of the workbench base coincides with the central axis of the roundness instrument workbench, and can rotate along the central axis driven by the roundness instrument workbench;

[0008] An angle adjustment mechanism, mounted on the workbench base, for adjusting the tilt angle of the workpiece being measured;

[0009] Angle locking mechanism, used to lock or release the angle adjustment mechanism;

[0010] A sliding workbench is mounted on the upper portion of the angle adjustment mechanism and is slidable;

[0011] A differential cylinder is connected to the sliding table and is used to precisely adjust the lateral position of the sliding table;

[0012] The mandrel is mounted on the sliding table and is used to mount the workpiece to be measured;

[0013] A measuring rod is provided with a measuring head, contacts the surface of the section to be measured of the workpiece and transmits a measuring signal, and is used to measure the roundness of the workpiece;

[0014] The coordinated adjustment of the angle adjustment mechanism and the differential cylinder enables the central axis of the roundness meter worktable to accurately pass through the center of the sphere of the workpiece being measured.

[0015] Optionally, a positioning pin is provided between the workbench base and the roundness meter workbench to ensure that the workbench base is aligned with the central axis of the roundness meter workbench.

[0016] Optionally, the angle adjustment mechanism is provided with a coarse adjustment knob, which cooperates with a differential cylinder to achieve combined adjustment of large angle and micro displacement.

[0017] Optionally, the angle locking mechanism adopts a quick locking structure for quickly releasing the structure so that the angle adjustment mechanism can adjust the tilt angle of the workpiece being measured, or, after the angle adjustment mechanism adjusts the tilt angle of the workpiece being measured, quickly lock the angle adjustment mechanism.

[0018] Optionally, the differential cylinder is a spiral structure with a fine adjustment precision function.

[0019] Optionally, the core shaft and the sliding workbench adopt a detachable connection structure to facilitate replacement of workpieces of different specifications.

[0020] Optionally, the workpiece to be measured is a rotationally symmetric non-complete spherical part.

[0021] Optionally, the sliding workbench is provided with a guide rail system to ensure smooth movement of the differential cylinder during adjustment and avoid position deviation.

[0022] Optionally, the measuring rod is connected to a measuring system of a roundness meter, which can automatically collect and transmit measurement data for measuring and recording the roundness of the workpiece through the center of the sphere.

[0023] Optionally, the measuring system connected to the measuring rod includes data recording and fitting software, which can draw polar coordinate diagrams and automatically calculate roundness errors.

[0024] On the other hand, the present invention provides a method for using the rotationally symmetric non-holonomic spherical roundness measuring tool, specifically a method for measuring and determining the spherical error of a rotationally symmetric non-holonomic spherical surface based on the rotationally symmetric non-holonomic spherical roundness measuring tool, comprising:

[0025] Install the workpiece to be measured on the core shaft, and adjust the inclination angle and lateral position of the worktable through the angle adjustment mechanism and the differential cylinder, so that the center axis of the roundness meter worktable passes through the center of the sphere of the workpiece to be measured;

[0026] Adjust the measuring rod so that it contacts the section of the workpiece to be measured to complete the initial positioning;

[0027] Drive the roundness tester table to rotate, so that the workpiece to be measured rotates synchronously with the roundness tester table, and the measuring rod synchronously collects radial displacement data of each point on the cross section to be measured during the rotation process;

[0028] The measuring system records the radial displacement variation of each point of the measured cross section of the workpiece during the rotation process;

[0029] Calculate the difference between the maximum and minimum values ​​in the recorded data as the roundness error value of the section to be measured;

[0030] The analysis system draws a polar coordinate circularity diagram of the workpiece being measured and analyzes the direction and distribution of the error.

[0031] The present invention provides a rotationally symmetric non-complete spherical roundness measurement tool and a method for use. The tool has a compact structure, strong adjustability, and high measurement accuracy. It can effectively solve the technical bottleneck that traditional roundness instruments can only measure horizontal sections and are difficult to adapt to non-center or inclined section measurements. The tool is equipped with an angle adjustment mechanism that combines a coarse adjustment knob and a high-precision differential cylinder to achieve rapid adjustment and micron-level precise control of the workpiece inclination angle, and greatly improves the adjustment efficiency and angle stability through a quick locking mechanism. The core shaft and the sliding workbench adopt a detachable connection structure, which is convenient for replacing workpieces of different specifications and improving the versatility of the system. In conjunction with the guide rail system and the automated measurement system, accurate roundness analysis of the measured section of the measured workpiece under the inclination angle installation requirements can be achieved, and data can be automatically recorded, polar coordinate diagrams can be drawn, and roundness errors can be calculated, thereby greatly improving the measurement accuracy, operation convenience, and data processing efficiency of the spherical error of the rotationally symmetric non-complete sphere, and meeting the diverse and high-precision requirements for roundness measurement of complex workpieces in high-end fields such as aerospace, automobile manufacturing, and precision machinery. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] This specification sets forth the complete and instructive disclosure of the present application, including its best mode of implementation, for those skilled in the art. This specification refers to the accompanying drawings, in which:

[0033] Figure 1 A schematic structural diagram of a rotationally symmetric non-holosphere roundness measurement tool provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0034] Reference will now be made in detail to the embodiments of the present application, one or more examples of the embodiments of the present application being illustrated in the drawings. Each example is provided for the purpose of explaining the present application and is not intended to limit the present application. In fact, it will be clear to those skilled in the art that various modifications and variations can be made in the present application without departing from the scope or spirit of the present application. For example, a feature illustrated or described as a part of one embodiment can be used together with another embodiment to produce yet another embodiment. As used in this specification, the terms "first", "second", etc. are used interchangeably to distinguish one component from another and are not intended to indicate the position or importance of each component. As used in this specification, unless the context clearly indicates otherwise, the terms "one", "an", "the", and "said" are intended to indicate the presence of one or more elements. The terms "comprise", "include", and "have" are intended to be inclusive and mean that there may be other elements in addition to the listed elements.

[0035] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0036] Figure 1 A schematic diagram of a rotationally symmetric non-holosphere roundness measurement tool provided by an embodiment of the present invention is shown in FIG. Figure 1 As shown, the tooling includes:

[0037] The roundness meter workbench 1 is used to provide a basic support platform, has an angle dial, and can rotate around the central axis of the roundness meter workbench 1;

[0038] The workbench base 2 is mounted on the roundness instrument workbench 1. The central axis of the workbench base 2 coincides with the central axis of the roundness instrument workbench 1 and can rotate along the central axis driven by the roundness instrument workbench 1.

[0039] An angle adjustment mechanism 3 is installed on the workbench base 2 and is used to adjust the tilt angle of the workpiece 6 to be measured;

[0040] Angle locking mechanism 8, used to lock or release the angle adjustment mechanism 3;

[0041] A sliding workbench 4 is mounted on the upper portion of the angle adjustment mechanism 3 and is slidable;

[0042] Differential cylinder 9, connected to the sliding table 4, used for precisely adjusting the lateral position of the sliding table 4;

[0043] The core shaft 7 is mounted on the sliding workbench and is used to mount the workpiece 6 to be measured; wherein the workpiece 6 to be measured is a rotationally symmetric non-holosphere part.

[0044] The measuring rod 5 is provided with a measuring head, contacts the surface of the section to be measured of the workpiece 6 and transmits a measuring signal, and is used to measure the roundness of the workpiece 6;

[0045] The coordinated adjustment of the angle adjustment mechanism 3 and the differential cylinder 9 enables the central axis of the roundness meter worktable 1 to accurately pass through the center of the sphere of the workpiece 6 to be measured.

[0046] The rotationally symmetric non-holosphere roundness measurement tool provided by the present invention achieves the following significant technical effects through a carefully designed structural combination, especially the coordinated use of the angle adjustment mechanism and the differential cylinder:

[0047] 1. Ensure that the measuring axis passes through the center of the sphere precisely, improving the accuracy of roundness measurement: Roughly adjust the workpiece inclination through the angle adjustment mechanism 3, and cooperate with the differential cylinder 9 to perform micron-level lateral precision adjustment on the sliding table 4. This ensures that the center of the workpiece 6 to be measured, on which the mandrel 7 is mounted, is precisely aligned with the central axis of the roundness meter table 1, thereby ensuring that the measuring axis passes through the center of the sphere, meeting the roundness measurement requirements of complex cross-sections to be measured.

[0048] 2. Supports measurement at different angles, expanding measurement adaptability and flexibility: The workbench base 2 can rotate around the central axis along with the roundness meter workbench 1, and can achieve arbitrary inclination angle setting through the angle adjustment mechanism. This makes the measurement not only limited to horizontal sections, but can also adapt to the roundness error analysis of spherical bodies and arbitrary oblique sections, significantly expanding the scope of application of the roundness meter.

[0049] Improve measurement alignment efficiency and reduce manual errors: The center axis of the worktable base 2 is strictly coaxial with the center axis of the roundness tester table 1, ensuring that the entire platform always moves around a fixed center during rotation. Combined with the high-precision position adjustment capability of the differential cylinder, this allows for rapid workpiece alignment, reducing manual recalibration and improving measurement efficiency and repeatability.

[0050] Fourth, the measurement process is stable and reliable, avoiding contact errors: The angle locking mechanism 8 rigidly locks the angle after setting, preventing measurement deviations caused by angle drift. Furthermore, the stable connection between the sliding table and the differential cylinder ensures smooth adjustment, effectively preventing interference such as bouncing and displacement of the stylus 5 when contacting the workpiece.

[0051] 5. Compact structure, easy operation, suitable for actual industrial application scenarios: The spatial layout of various components is compact and reasonable, and the angle adjustment and fine-tuning mechanisms are integrated into an integrated platform, which makes it convenient for users to quickly clamp workpieces and set measurement positions, thereby improving the overall operability and on-site applicability of the equipment.

[0052] In one embodiment, a positioning pin (not shown) is provided between the workbench base 2 and the roundness tester workbench 1 to ensure alignment of the central axes of the workbench base 2 and the roundness tester workbench 1. This structure avoids eccentricity caused by installation errors, thereby improving the accuracy of roundness measurement.

[0053] In one embodiment, the angle adjustment mechanism 3 is equipped with a coarse adjustment knob that cooperates with a differential cylinder 9 to achieve combined adjustment of large angles and micro-displacements. Rotating this knob drives the adjustment module to rotate within a wide range, enabling rapid setting of the initial tilt angle of the workpiece 6 being measured. The coarse adjustment mechanism is typically linked to the rotating shaft via a gear or worm mechanism, resulting in a simple structure and rapid response. The differential cylinder 9 is mounted on the micro-motion unit of the angle adjustment mechanism and utilizes a screw-type propulsion structure, offering high linear propulsion accuracy and anti-backlash performance. After coarse adjustment is completed, the operator can precisely control the angular displacement at the micrometer level by rotating the differential cylinder, ultimately precisely setting the tilt angle of the workpiece being measured. The rotation of the differential cylinder achieves fine angle adjustment via a fine-pitch thread, with graduated markings to aid visual reading. Furthermore, to ensure stability throughout the adjustment process, the angle adjustment mechanism is internally equipped with friction damping and limiter structures to effectively prevent mechanical shock during the coarse adjustment process from affecting the fine adjustment results.

[0054] In one embodiment, the angle locking mechanism 8 adopts a quick locking structure for quickly releasing the structure so that the angle adjustment mechanism 3 can adjust the inclination angle of the workpiece to be measured. After the angle adjustment mechanism 3 adjusts the inclination angle of the workpiece to be measured, the angle adjustment mechanism 3 is quickly locked. When it is necessary to adjust the inclination angle of the workpiece to be measured, the user only needs to easily operate the unlocking mechanism to flexibly adjust the angle adjustment mechanism; after the adjustment is completed, the set angle can be firmly locked through the quick locking mechanism to ensure that the adjustment accuracy is not offset due to equipment vibration or misoperation. This technical solution solves the problems of cumbersome adjustment steps, unstable locking, and the need to use tools of traditional locking mechanisms. It effectively improves the convenience of operation, measurement preparation efficiency and angle stability during the measurement process. It is particularly suitable for high-precision measurement scenarios that require frequent angle fine-tuning and repositioning.

[0055] In one embodiment, the differential cylinder 9 is a spiral structure with a fine adjustment precision function.

[0056] In one embodiment, the core shaft 7 and the sliding workbench 4 adopt a detachable connection structure to facilitate the replacement of workpieces 6 of different specifications.

[0057] In one embodiment, the workpiece 6 to be measured is a non-complete spherical rotationally symmetrical part.

[0058] In one embodiment, the sliding workbench 4 is provided with a guide rail system to ensure smooth movement of the differential cylinder during adjustment and avoid position deviation.

[0059] In one embodiment, the measuring rod 5 is connected to the roundness tester's measuring system (not shown) to automatically collect and transmit measurement data for measuring and recording the roundness of the workpiece 6 through the center of the sphere. The roundness errors of the cross-center sections at multiple angles relative to the equatorial section are calculated, with the largest roundness error value being considered the spherical error. Specifically, when measuring spherical error, data on the sphere's surface is typically acquired through a series of cross-center sections at different angles. Each section represents the shape of the sphere at different orientations. In practice, the following methods can be used to measure cross-sections: The equatorial section, located at the center plane of the sphere, is typically one of the most critical sections. Measuring the error of the equatorial section provides essential information about the sphere's shape. In addition to the equatorial section, the sphere is cut at multiple angles, such as 0°, 22.5°, 45°, 60°, and 90°. After obtaining the measurement data, the roundness of each section is fitted and the roundness error is calculated. Specifically, the difference between the fitted circle and the actual measurement point is used to determine the roundness error value for each section. Finally, among all the measured cross sections, the maximum roundness error is selected as the spherical error. Usually, this maximum value reflects the shape deviation of the sphere.

[0060] In one embodiment, the measuring system connected to the measuring rod 5 includes data recording and fitting software, which can draw polar coordinate diagrams and automatically calculate the roundness error of the measured section as the spherical error caused by the inconsistency of the spherical profile of the part's equator and the circular section passing through the center of the sphere and perpendicular to the equator.

[0061] The present invention also provides a method for using the above-mentioned rotationally symmetric non-holonomic spherical roundness measuring tool, comprising:

[0062] Step 11: Mount the workpiece 6 on the core shaft 7, and adjust the inclination angle and lateral position of the worktable through the angle adjustment mechanism 3 and the differential cylinder 9, so that the central axis of the roundness meter worktable 1 passes through the center of the sphere of the workpiece 6;

[0063] Step 12: Adjust the measuring rod 5 so that it contacts the section to be measured of the workpiece 6 to complete the initial positioning;

[0064] Step 13: driving the roundness tester table 1 to rotate, so that the workpiece 6 rotates synchronously with the roundness tester table 1, and the measuring rod 5 synchronously collects radial displacement data of each point of the cross section to be measured during the rotation process;

[0065] Step 14: Record the radial displacement variation of each point of the measured cross section of the workpiece 6 during the rotation process by the measuring system;

[0066] Step 15: Calculate the roundness error value of the measured section using the least square method;

[0067] Step 16: The analysis system draws a polar coordinate circularity diagram of the workpiece 6 to be measured, and analyzes the direction and distribution of the error.

[0068] Step 17: After completing the measurement of a specific section of the workpiece 6, the user can adjust the angle adjustment mechanism to a new inclination angle and repeat the above measurement steps. By collecting the roundness errors of multiple sections at different angles, a complete roundness error distribution map of the spherical part can be more accurately constructed in three-dimensional space, achieving a precise evaluation of the overall geometric accuracy of the spherical surface.

[0069] In one embodiment, during the measurement process, the roundness tester table 1 rotates at a constant, low speed to avoid spindle bounce or data jitter caused by high rotational speeds, thereby improving data acquisition stability and repeatability. This measure ensures that the measurement system responds stably to every angular displacement throughout the entire rotation cycle, and the data more accurately reflects changes in the workpiece contour.

[0070] In one embodiment, a high-precision displacement sensor is used to record the radial change data of the measuring rod in real time. The information collected by the sensor will be synchronously transmitted to the data processing module or computer system for subsequent roundness error calculation and fitting analysis, ensuring that the entire measurement process is automated and efficient.

[0071] In one embodiment, a least square method is used to fit a theoretical circle to the collected radial data points, and the difference between the maximum deviation and the minimum deviation is used as the roundness error value.

[0072] In one embodiment, in order to improve measurement stability and traceability, the coordinates of the initial contact point of the measuring rod 5 are recorded before each measurement and compared and verified after the measurement is completed to prevent measurement deviation caused by sliding error or installation disturbance and improve the consistency of the measurement process.

[0073] In one embodiment, the computer system converts the measured data into a polar coordinate graph to reflect the directional and periodic characteristics of the roundness error, which helps analyze the sources of manufacturing errors, such as machine tool spindle eccentricity and fixture deformation, and guides subsequent process optimization.

[0074] In one embodiment, this method is applicable to a variety of precision parts with spherical center geometry, such as spherical shells, ball sockets, and spherical bearings. Traditional methods often struggle to capture the spherical error of the entire sphere when measuring these workpieces, or when tilting plasticine parts, ensuring that the center of the sphere and the axis of rotation coincide. This method, through platform structural design and a fine-tuning mechanism, effectively resolves this issue and has broad engineering application prospects.

[0075] The description of the present invention has been presented for purposes of illustration and description and is not intended to be exhaustive or to limit the invention to the form disclosed. Many modifications and variations will be apparent to those skilled in the art. The embodiments were chosen and described in order to better illustrate the principles of the invention and its practical application and to enable those skilled in the art to understand the invention and design various embodiments with various modifications as are suited for specific applications.

[0076] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A rotationally symmetric non-holosphere roundness measurement tool, characterized in that: include: A roundness meter workbench (1) is used to provide a basic support platform, has an angle scale, and is capable of rotating around the central axis of the roundness meter workbench (1); A workbench base (2) is mounted on the roundness meter workbench (1), wherein the central axis of the workbench base (2) coincides with the central axis of the roundness meter workbench (1), and can rotate along the central axis driven by the roundness meter workbench (1); An angle adjustment mechanism (3) is mounted on the workbench base (2) and is used to adjust the tilt angle of the workpiece (6) being measured; An angle locking mechanism (8) for locking or releasing the angle adjustment mechanism (3); A sliding workbench (4) is mounted on the upper portion of the angle adjustment mechanism (3) and is slidable; A differential cylinder (9) connected to the sliding table (4) for precisely adjusting the lateral position of the sliding table (4); A core shaft (7) is mounted on the sliding table (4) and is used to mount the workpiece (6) to be measured; A measuring rod (5) is provided with a measuring head, contacts the surface of the cross section of the workpiece (6) to be measured and transmits a measuring signal, and is used to measure the roundness of the workpiece (6) to be measured; The angle adjustment mechanism (3) and the differential cylinder (9) are adjusted in coordination so that the central axis of the roundness meter worktable (1) can accurately pass through the center of the sphere of the workpiece (6) being measured; The angle adjustment mechanism (3) is provided with a coarse adjustment knob, which cooperates with the differential cylinder (9) to achieve a combined adjustment of large angle and micro displacement. The angle adjustment mechanism (3) is rotated within a large range to achieve a rapid setting of the initial tilt angle of the measured workpiece (6). After the coarse adjustment is completed, the micron-level angular displacement is carefully controlled by rotating the differential cylinder (9) to accurately set the tilt angle of the measured workpiece (6).

2. The rotationally symmetric non-holonomic spherical roundness measuring tool according to claim 1, characterized in that: A positioning pin is provided between the workbench base (2) and the roundness meter workbench (1) to ensure that the workbench base (2) and the central axis of the roundness meter workbench (1) are aligned.

3. The rotationally symmetric non-holosphere roundness measuring tool according to claim 1, characterized in that: The angle locking mechanism (8) adopts a quick locking structure for quickly releasing the structure, so that the angle adjustment mechanism (3) can adjust the tilt angle of the workpiece being measured. After the angle adjustment mechanism (3) adjusts the tilt angle of the workpiece to be measured, the angle adjustment mechanism (3) is quickly locked.

4. The rotationally symmetric non-holosphere roundness measuring tool according to claim 1, characterized in that: The differential cylinder (9) is a spiral structure and has a fine adjustment precision function.

5. The rotationally symmetric non-holonomic spherical roundness measuring tool according to claim 1, characterized in that: The core shaft (7) and the sliding workbench (4) adopt a detachable connection structure, which facilitates the replacement of workpieces (6) to be measured of different specifications.

6. The rotationally symmetric non-holonomic spherical roundness measuring tool according to claim 1, characterized in that: The workpiece (6) to be measured is a rotationally symmetrical non-complete spherical part.

7. The rotationally symmetric non-holonomic spherical roundness measuring tool according to claim 1, characterized in that: The sliding workbench (4) is provided with a guide rail system to ensure smooth movement of the differential cylinder during adjustment and avoid position deviation.

8. The rotationally symmetric non-holonomic spherical roundness measuring tool according to claim 1, characterized in that: The measuring rod (5) is connected to the measuring system of the roundness meter and can automatically collect and transmit measurement data for measuring and recording the roundness of the workpiece (6) passing through the center of the sphere; and / or The measuring system connected to the measuring rod (5) includes data recording and fitting software, which can draw polar coordinate diagrams and automatically calculate roundness errors.

9. A method for using the rotationally symmetric non-holosphere roundness measuring tool according to any one of claims 1 to 8, characterized in that: include: The workpiece (6) to be measured is mounted on the core shaft (7), and the inclination angle and the lateral position of the worktable are adjusted by the angle adjustment mechanism (3) and the differential cylinder (9) so that the central axis of the roundness meter worktable (1) passes through the center of the sphere of the workpiece (6) to be measured; Adjusting the measuring rod (5) so that it contacts the section to be measured of the workpiece (6) to complete the initial positioning; The roundness meter worktable (1) is driven to rotate, so that the workpiece (6) to be measured rotates synchronously with the roundness meter worktable (1), and the measuring rod (5) synchronously collects radial displacement data of each point of the cross section to be measured during the rotation process; Recording the radial displacement variation of each point of the measured cross section of the workpiece (6) during the rotation process by a measuring system; Calculate the difference between the maximum and minimum values ​​in the recorded data as the roundness error value of the section to be measured; The analysis system draws a polar coordinate circularity diagram of the workpiece (6) being measured and analyzes the direction and distribution of the error.

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