Radial dimension detection method for large bearing diameter standard parts based on coordinate measurement

Abstract

A method for detecting the radial dimension of a large bearing diameter standard part based on coordinate measuring machine (CMM) is proposed. This method involves repeatedly constructing a Cartesian coordinate system on the workpiece, selecting a region on the measured circular surface at a certain distance *h* from the end face where the circular error changes gradually, and collecting the spatial coordinates of two radially corresponding measurement points. Further evaluation of the distance between the two measurement points yields the detected value of the radial dimension of the large bearing ring diameter standard part. Through multiple measurements and evaluations, the method provides the detected value of the radial dimension of the large bearing ring diameter standard part, the measurement uncertainty, and marks the detection location. This detection method is based on the consideration of the circular error of the measured surface of the large bearing ring and its practical application as a diameter standard part. It utilizes the capabilities of a CMM and is a direct detection method, effectively solving the limitation of length measuring machines in detecting the radial dimension of large bearing ring diameter standard parts.

Description

Technical Field

[0001] This invention relates to the field of inspection technology in the process of measuring and transmitting the accuracy of bearing diameter dimensions. It mainly relates to a method for detecting the radial dimensions of large diameter standard parts by constructing a spatial rectangular coordinate system of the workpiece. It is applicable to the direct detection of the inner and outer diameter dimensions of large bearing rings or large annular structural parts as diameter standard parts. Background Technology

[0002] In the machining, assembly, and inspection of bearings, the use of numerous specialized measuring tools is essential to ensure bearing product quality and improve inspection efficiency. The diameter dimensions (inner and outer diameters) of a bearing are one of the key inspection items determining bearing quality. Inner diameter standard ring gauges and outer diameter standard gauges, serving as diameter standard parts, are specialized measuring tools for inspecting the accuracy of bearing inner and outer diameter dimensions. They are typically used in conjunction with specialized bearing diameter instruments. In practical applications, the instruments of the specialized bearing instruments are aligned and adjusted at two radial testing points on the diameter standard parts. After adjustment, the accuracy of the bearing's inner and outer diameter dimensions can be inspected. The accuracy of the radial dimension calibration or testing data of the diameter standard parts directly affects the transmission of measurement values ​​and precision, thus impacting the quality of the bearing product.

[0003] The inspection or calibration of bearing-specific diameter standard parts is usually performed on a length measuring machine by selecting gauge blocks of the appropriate grade according to the accuracy requirements of the standard parts, or by directly measuring the standard parts. During measurement, the standard part to be measured is placed on the calibrated worktable of the length measuring machine. The measuring head of the length measuring machine lightly touches the surface of the standard part. By adjusting the position of the worktable, it is adjusted to the maximum diameter of the cross-section of the standard part. The data of the length measuring machine at this point is recorded, and then the data is processed to give the inspection result. The inspection position is marked on the end face of the standard part.

[0004] However, existing length measuring machine worktables have certain limitations on the range and weight of workpieces they can bear. For example, the load-bearing size range of a certain type of length measuring machine worktable is approximately 300mm × 300mm, and the load-bearing weight is ≤10kg. Typically, for measuring the length of rod-like workpieces whose weight meets the load-bearing requirements, the length measuring machine worktable can support the middle part of the workpiece. However, for large bearing rings or large annular structural parts with large center bores, the lack of a load-bearing entity at the center of the workpiece means the load-bearing surface of the length measuring machine worktable cannot support the workpiece. Furthermore, the excessive weight makes it impossible to meet the load-bearing requirements of the measured part. This results in the inability to use length measuring machines to measure the diameter of large bearing rings or large annular structural parts with large center bores. This is especially true for high-precision radial dimension measurements using actual large bearing rings or large annular structural parts with large center bores as standard diameter parts; other conventional testing methods cannot meet these accuracy requirements. Summary of the Invention

[0005] This invention provides a method for detecting the radial dimension of a large bearing diameter standard part based on coordinate measurement, which can solve the limitations of existing methods that use actual products of large bearing rings or large annular structural parts with large center hole diameters as diameter standard parts for radial dimension detection.

[0006] The technical solution adopted in this invention is: a method for detecting the radial dimension of a large bearing diameter standard part based on coordinate measurement, the steps of which are as follows: S01. Manually collect the surface elements and diameter circle elements of the standard diameter part, and manually establish the workpiece coordinate system; S02. Automatically collect surface elements and diameter circle elements of standard diameter parts, and automatically establish the workpiece coordinate system; S03. Automatically collect coordinate data points of the measured circle at a certain distance h from the end face, evaluate and obtain the diameter and circular error of the circle at the specified position, and determine the areas where the circular error changes gently at two radially corresponding locations. S04. Automatically collect the end face elements of the diameter standard part, the diameter circle, and the point elements on the end face where the radially corresponding circular error changes are relatively flat, and establish a new workpiece rectangular coordinate system. S05. Determine whether the X-axis or Y-axis of the newly established rectangular coordinate system is set on the two radially corresponding regions where the circular error changes are relatively flat. If yes, proceed to the next step; if no, repeat step S04. S06. In the newly established workpiece coordinate system, on the X-axis or Y-axis and at a certain distance h from the end face, automatically collect the coordinates of two radially corresponding measurement points in the vector direction to obtain the radial distance between the two radially corresponding measurement points. As a preferred option, step S07 is also included: By repeatedly measuring the radial dimension of a large bearing diameter standard part and processing the data from multiple measurements, the measured value φ was obtained. 检 And measurement uncertainty, and mark the detection location. As a preferred embodiment, in steps S01 and S02... By collecting the end face elements and diameter circle elements of the diameter standard part, a rectangular coordinate system parallel to the machine coordinate system is set on the end face of the diameter standard part. The origin of the rectangular coordinate system's X-axis, Y-axis, and Z-axis is set at the center of the projection circle of the diameter circle of the diameter standard part onto the end face. As a preferred embodiment, in step S01, the coordinate measuring machine is manually operated to collect the coordinate information of three measuring points on the end face representing the surface element on the diameter standard part and the coordinate information of three measuring points on the diameter circular surface representing the circle element to initially establish the workpiece coordinate system. As a preferred embodiment, in step S02, the coordinate information of three or more measurement points on the end face of the representative surface element of the diameter standard part and the coordinate information of three or more measurement points on the diameter circle surface of the representative circle element are collected by the automatic program operation coordinate measuring machine to accurately establish the workpiece coordinate system. Under the automatic establishment of the workpiece coordinate system, the coordinate information of the measurement points on the diameter circle to be measured at a certain distance h from the end face is automatically collected to obtain the diameter φ and circular error t of the circle at the specified position, and the detection area is determined according to the change of the circular error of the diameter circle to be measured. As a preferred embodiment, in steps S04 and S05, the coordinate information of the end face element, diameter circle element, and individual measurement point on the end face representing the diameter standard part is automatically collected under the measurement program. The machine coordinate system is established on the end face of the diameter standard part, wherein the origin of the X-axis, Y-axis, and Z-axis of the rectangular coordinate system is set at the center of the projection circle on the end face of the diameter circle of the diameter standard part. The X-axis or Y-axis of the rectangular coordinate system is set in the direction of the line connecting the center of the projection circle on the end face and the individual measurement point on the end face. It is then determined whether the X-axis or Y-axis of the newly established workpiece coordinate system is set in the region where the radially corresponding circular error changes smoothly. Otherwise, the coordinate information of the individual measurement point on the end face is collected again, the workpiece coordinate system is re-established, and the determination is made again. As a preferred embodiment, in steps S04 and S05, a large number of points are collected on the circle at the specified position, the circle element at the specified position is obtained by scanning, and the diameter φ and circular error t of the circle at the specified position are obtained. As a preferred approach, this process involves performing more than 10 measurements at two corresponding radial measurement points, and processing the multiple measurements to obtain the detection value φ for the two corresponding measurement points. 检 The invention provides the measurement uncertainty of the test and marks the test location. The beneficial effects of this invention are:

[0007] The present invention proposes a method for detecting the radial dimension of a large bearing diameter standard part based on coordinate measurement. Using the above technical solution, it has the following beneficial effects: 1) The present invention adopts a step-by-step measurement technology scheme of "selecting a suitable detection area" and "detecting the distance between two radially corresponding measurement points". It takes into account the influence of the circular error of the workpiece itself as a diameter standard part on the detection value, and also conforms to the actual application of "the distance between two benchmark points" as a diameter standard part. 2) The present invention adopts a direct measurement method, which effectively solves the limitation of the length measuring machine in measuring the radial dimension of large bearing rings with large center hole diameter as the standard diameter part. The present invention is also applicable to the direct measurement of the radial corresponding two points of large ring structure parts as the standard diameter part. In summary, this invention proposes a method for detecting the radial dimensions of large bearing diameter standard parts based on coordinate measurement, which solves the limitations of existing methods for detecting the radial dimensions of large bearing ring diameter standard parts and large annular structural parts. Attached Figure Description

[0008] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0009] Figure 1 This is a flowchart illustrating a preferred embodiment of the present invention for detecting the radial dimension of a large bearing diameter standard part based on coordinate measurement; Figure 2 yes Figure 1 A schematic diagram of the S01 steps for inspecting the inner diameter of standard bearing diameter parts for medium and large bearings; Figure 3 yes Figure 1 A schematic diagram of the S02 steps for inspecting the inner diameter of standard bearing diameter parts for medium and large bearings; Figure 4 yes Figure 1 A schematic diagram of the S03 steps for inspecting the inner diameter of standard parts for medium and large bearings; Figure 5 yes Figure 1 Schematic diagram of S04 steps for measuring the inner diameter of standard parts for medium and large bearings; Figure 6 yes Figure 1 Schematic diagram of step S05 for measuring the inner diameter of standard parts for medium and large bearings; Figure 7 yes Figure 1 Schematic diagram of step S06 for measuring the inner diameter of standard parts for medium and large bearings; Figure 8 yes Figure 1 A schematic diagram of the S01 steps for inspecting the outer diameter of standard parts for medium and large bearings; Figure 9 yes Figure 1 A schematic diagram of the S02 steps for inspecting the outer diameter of standard bearing parts for medium and large bearings; Figure 10 yes Figure 1 A schematic diagram of the S03 steps for inspecting the outer diameter of standard bearing parts for medium and large bearings; Figure 11 yes Figure 1 A schematic diagram of step S04 for inspecting the outer diameter of standard parts for medium and large bearings; Figure 12 yes Figure 1 Schematic diagram of S05 steps for inspecting the outer diameter of standard parts for medium and large bearings; Figure 13 yes Figure 1 A schematic diagram of step S06 for inspecting the outer diameter of standard parts for medium and large bearings. Detailed Implementation

[0010] The present invention will now be described in detail through exemplary embodiments. However, it should be understood that, without further description, the elements, structures, and steps in one embodiment may be advantageously incorporated into other embodiments.

[0011] It should be noted that, unless otherwise defined, the technical or scientific terms used herein should have the ordinary meaning understood by one of ordinary skill in the art to which this invention pertains. The terms "a," "an," or "the," and similar words used in the specification and claims of this patent application do not express a limitation of quantity, but rather indicate the presence of at least one. Terms such as "comprising" or "including" indicate that the elements or objects preceding "comprising" encompass the elements or objects listed following "comprising" or "including" and their equivalents, but do not exclude other elements or objects having the same function. Example 1

[0012] The following is in conjunction with the appendix Figure 1-13 The working process of this embodiment will be described in detail below:

[0013] like Figure 1As shown, a method for detecting the radial dimension of a large bearing diameter standard part based on coordinate measurement is presented. The detection method consists of two measurement steps: "(I) Selecting a suitable detection area" and "(II) Detecting the distance between two radially corresponding measurement points". The first measurement step, "(I) Selecting a suitable detection area", involves firstly manually establishing the workpiece coordinate system (S01) and then automatically establishing the workpiece coordinate system (S02). Secondly, under the automatically established workpiece coordinate system, a large number of data point coordinates of the circle at a specified position of the diameter standard part being detected are automatically collected. The diameter φ and circular error t of the circle at the specified position are evaluated, and the area where the radially corresponding circular error changes smoothly (S03) is observed and analyzed. Further, the two radially corresponding measurement points are selected and set at the two radially corresponding circular error changes smoothly. On the gentler area; further, on the end face where the two radially corresponding areas of gentle circular error change are located, a coordinate point is collected, and a new workpiece coordinate system is established in step S04. The X-axis or Y-axis of the rectangular coordinate system is established on the two radially corresponding areas of gentle circular error change in step S04. The two radially corresponding measurement points are set in the X-axis or Y-axis direction of the newly established workpiece coordinate system; further, it is observed and judged whether the X-axis or Y-axis of the newly established workpiece coordinate system is on the two radially corresponding areas of gentle circular error change in step S05. If it deviates from the area of ​​gentle circular error change, a coordinate point is collected again on the end face, and the workpiece coordinate system is re-established until the X-axis or Y-axis of the newly established workpiece coordinate system is on the two radially corresponding areas of gentle circular error change.

[0014] The second measurement step of the detection method, "(II) Detecting the distance between two radially corresponding measurement points", is performed in step S06 under a newly established workpiece coordinate system. In the X-axis or Y-axis direction of the newly established workpiece coordinate system, at a certain distance h from the end face, the coordinates of the measurement points (φ / 2, 0, h) in the positive X-axis vector direction or (0, φ / 2, h) in the positive Y-axis vector direction, and the corresponding coordinates of the measurement points (-φ / 2, 0, h) in the negative X-axis vector direction or (0, -φ / 2, h) in the negative Y-axis vector direction are automatically collected. Then, the radial distance between the two radially corresponding measurement points (φ / 2, 0, h) and (-φ / 2, 0, h) or (0, φ / 2, h) and (0, -φ / 2, h) is the detected value of the radial dimension of the standard part of the large bearing ring diameter. Further, in step S07, the radial dimension of the large bearing diameter standard part is measured multiple times, and the data from these measurements is processed to determine the measured value φ for this inspection. 检 And measurement uncertainty, and mark the detection location.

[0015] Combination Figure 1Methods for inspecting the inner diameter of standard large bearing parts, such as... Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 and Figure 7 As shown; Combination Figure 1 and Figure 2 The method for detecting the inner diameter of a large bearing standard part, step S01, involves manually establishing a workpiece coordinate system. This is achieved by manually operating a coordinate measuring machine to collect coordinate information from three measuring points on the end face of the representative surface element of the diameter standard part and three measuring points on the inner diameter circle surface of the representative circle element. Using the collected surface and circle elements of the diameter standard part, a rectangular coordinate system parallel to the machine coordinate system is set on the end face of the diameter standard part. The origin of the rectangular coordinate system's X, Y, and Z axes is set at the center of the projection circle of the inner diameter circle of the diameter standard part onto the end face.

[0016] Combination Figure 1 and Figure 3 In the method for detecting the inner diameter of the large bearing diameter standard part, step S02 involves automatically establishing a workpiece coordinate system. Similar to step S01, the workpiece coordinate system is precisely established by using an automatic program to operate a coordinate measuring machine to collect coordinate information from at least three measuring points on the end face of the representative surface element of the diameter standard part and at least three measuring points on the inner diameter circular surface of the representative circular element. Further, under the workpiece coordinate system automatically established in step S02, coordinate data points of the measured circle at a certain distance h from the end face are automatically collected, thereby evaluating and obtaining the diameter φ and circular error t of the circle at the specified position.

[0017] Combination Figure 1 and Figure 4 The S03 step of the method for detecting the inner diameter of the standard large bearing diameter part is to observe the area where the inner diameter roundness changes gradually, and further select a suitable detection area.

[0018] Combination Figure 1 and Figure 5 The S04 step of the method for detecting the inner diameter of a large bearing diameter standard part is to establish a new workpiece coordinate system. Under the measurement program, the coordinate information of the end face element, inner diameter circle element, and a single measurement point on the end face representing the diameter standard part is automatically collected. The machine coordinate system is established on the end face of the diameter standard part. The origin of the rectangular coordinate system X-axis, Y-axis, and Z-axis is set at the center of the projection circle on the end face of the inner diameter circle of the diameter standard part. The X-axis or Y-axis of the rectangular coordinate system is set in the direction of the line connecting the center of the projection circle on the end face and the single measurement point on the end face.

[0019] Combination Figure 1 and Figure 6The S05 step of the method for detecting the inner diameter of the standard part of the large bearing diameter is to observe and judge whether the X-axis or Y-axis of the newly established workpiece coordinate system is set on the two radially corresponding areas where the circular error changes gently; otherwise, the coordinate information of a single measurement point on the end face is collected again, the workpiece coordinate system is re-established and observed and judged until the work of “(Ⅰ) Selecting a suitable detection area” is completed.

[0020] Combination Figure 1 and Figure 7 The S06 step of the method for detecting the inner diameter of the standard bearing diameter is "(II) Detecting the distance between two radially corresponding measurement points". On the inner diameter at a certain distance h from the end face along the X-axis or Y-axis direction of the newly established workpiece coordinate system, the coordinates of the measurement point in the positive X-axis vector direction (φ / 2, 0, h) or the positive Y-axis vector direction (0, φ / 2, h), and the corresponding coordinates of the measurement point in the negative X-axis vector direction (-φ / 2, 0, h) or the negative Y-axis vector direction are collected. The coordinates of the measurement point in the vector direction are (0, -φ / 2, h). The radial distance between two corresponding radial measurement points (φ / 2, 0, h) and (-φ / 2, 0, h) or (0, φ / 2, h) and (0, -φ / 2, h) is then evaluated as the measured value of the inner diameter of the standard large bearing race. Further, in step S07, through multiple measurements of the inner diameter of the standard large bearing race and data processing of these measurements (such as averaging), the measured value φ is given. 检 The measurement uncertainty is determined, and the detection location is marked. This completes the second measurement step of detecting the inner diameter of the large bearing diameter standard part: "(II) Detecting the distance between two radially corresponding measurement points". In this embodiment, the inner diameter of the large bearing diameter standard part is measured according to the above detection method. The inner diameter detection value φ is calculated by averaging multiple measurement values. 检 As shown in Table 1. Table 1. Data table of examples for measuring the inner diameter of standard parts for large bearings.

[0021] Combination Figure 1 Methods for inspecting the outer diameter of standard large bearing parts, such as... Figure 8 , Figure 9 , Figure 10 , Figure 11 , Figure 12 and Figure 13 As shown;

[0022] Combination Figure 1 and Figure 8The method for detecting the outer diameter of a large bearing standard part, step S01, involves manually establishing a workpiece coordinate system. This is achieved by manually operating a coordinate measuring machine to collect coordinate information from three measuring points on the end face of the representative surface element of the diameter standard part and three measuring points on the outer diameter circle surface of the representative circle element. Using the collected surface and circle elements of the diameter standard part, a rectangular coordinate system parallel to the machine coordinate system is set on the end face of the diameter standard part. The origin of the rectangular coordinate system's X, Y, and Z axes is set at the center of the projection circle of the outer diameter circle projected onto the end face.

[0023] Combination Figure 1 and Figure 9 In the method for detecting the outer diameter of the large bearing diameter standard part, step S02 involves automatically establishing a workpiece coordinate system. Similar to step S01, an automatic program operates a coordinate measuring machine to collect coordinate information from at least three measurement points on the end face of the representative surface element of the diameter standard part and at least three measurement points on the outer diameter circular surface of the representative circular element to precisely establish the workpiece coordinate system. Further, under the workpiece coordinate system automatically established in step S02, coordinate data points of the measured circle at a certain distance h from the end face are automatically collected, thereby evaluating and obtaining the diameter φ and circular error t of the circle at the specified position.

[0024] Combination Figure 1 and Figure 10 The S03 step of the method for detecting the outer diameter of the large bearing diameter standard part is to observe the area where the outer diameter roundness changes gradually, and further select a suitable detection area.

[0025] Combination Figure 1 and Figure 11 The S04 step of the method for detecting the outer diameter of a large bearing standard part is to establish a new workpiece coordinate system. Under the measurement program, the coordinate information of the end face element, the outer diameter circle element, and a single measurement point on the end face representing the diameter standard part is automatically collected. The machine coordinate system is established on the end face of the diameter standard part. The origin of the rectangular coordinate system X-axis, Y-axis, and Z-axis is set at the center of the projection circle on the end face of the outer diameter circle of the diameter standard part. The X-axis or Y-axis of the rectangular coordinate system is set in the direction of the line connecting the center of the projection circle on the end face and the single measurement point on the end face.

[0026] Combination Figure 1 and Figure 12 The S05 step of the method for detecting the outer diameter of the standard part of the large bearing diameter is to observe and judge whether the X-axis or Y-axis of the newly established workpiece coordinate system is set on the two radially corresponding areas where the circular error changes are relatively flat; otherwise, the coordinate information of a single measurement point on the end face is collected again, the workpiece coordinate system is re-established and observed and judged until the work of “(Ⅰ) Selecting a suitable detection area” is completed.

[0027] Combination Figure 1 and Figure 13 The S06 step of the method for detecting the outer diameter of the large bearing diameter standard part is the measurement work of "(II) detecting the distance between two radially corresponding measurement points". On the outer diameter at a certain distance h from the end face in the X-axis or Y-axis direction of the newly established workpiece coordinate system, the coordinates of the measurement point in the positive X-axis vector direction (φ / 2, 0, h) or the positive Y-axis vector direction (0, φ / 2, h) and the corresponding coordinates of the measurement point in the negative X-axis vector direction (-φ / 2, 0, h) or the negative Y-axis vector direction are collected. The coordinates of the measurement point in the vector direction are (0, -φ / 2, h). The radial distance between two corresponding radial measurement points (φ / 2, 0, h) and (-φ / 2, 0, h) or (0, φ / 2, h) and (0, -φ / 2, h) is then evaluated as the measured value of the outer diameter of the standard large bearing race. Further, in step S07, through multiple measurements of the outer diameter of the standard large bearing race and data processing of these measurements (such as averaging), the measured value φ is given. 检 The measurement uncertainty is measured, and the detection position is marked. This completes the second measurement step of the large bearing diameter standard part outer diameter detection: "(II) Detect the distance between two radially corresponding measurement points".

[0028] In this embodiment, the outer diameter of a large bearing standard part is measured according to the above-described detection method. The outer diameter value φ is calculated by averaging multiple measured values. 检 As shown in Table 2: Table 2. Data table of examples for measuring the outer diameter of standard parts for large bearings.

[0029] The parts not detailed in this solution are existing technologies.

[0030] It should be noted that although the present invention has been described through the above embodiments, the present invention may have many other embodiments. Without departing from the spirit and scope of the present invention, those skilled in the art can obviously make various corresponding changes and modifications to the present invention, but all such changes and modifications should fall within the scope of protection of the appended claims and their equivalents.

Claims

1. A method for detecting the radial dimension of a large bearing diameter standard part based on coordinate measurement, characterized in that: The steps are as follows: S01. Manually collect the surface elements and diameter circle elements of the standard diameter part, and manually establish the workpiece coordinate system; S02. Automatically collect surface elements and diameter circle elements of standard diameter parts, and automatically establish the workpiece coordinate system; S03. Automatically collect coordinate data points of the measured circle at a certain distance h from the end face, evaluate and obtain the diameter and circular error of the circle at the specified position, and determine the areas where the circular error changes gently at two radially corresponding locations. S04. Automatically collect the end face elements of the diameter standard part, the diameter circle, and the point elements on the end face where the radially corresponding circular error changes are relatively flat, and establish a new workpiece rectangular coordinate system. S05. Determine whether the X-axis or Y-axis of the newly established rectangular coordinate system is set on the two radially corresponding areas where the circular error changes gradually. If yes, proceed to the next step; if no, repeat step S04. In steps S04 and S05, the coordinate information of the end face element, diameter circle element, and single measurement point on the end face representing the diameter standard part is automatically collected under the measurement program. The machine coordinate system is established on the end face of the diameter standard part. The origin of the X-axis, Y-axis, and Z-axis of the rectangular coordinate system is set at the center of the projection circle on the end face of the diameter circle of the diameter standard part. The X-axis or Y-axis of the rectangular coordinate system is set in the direction of the line connecting the center of the projection circle on the end face and the single measurement point on the end face. Determine whether the X-axis or Y-axis of the newly established workpiece coordinate system is set on the two radially corresponding areas where the circular error changes gradually. Otherwise, re-collect the coordinate information of the single measurement point on the end face, re-establish the workpiece coordinate system, and perform the judgment again. S06. In the newly established workpiece coordinate system, on the X-axis or Y-axis and at a certain distance h from the end face, automatically collect the coordinates of two radially corresponding measurement points in the vector direction to obtain the radial distance between the two radially corresponding measurement points.

2. The method for detecting the radial dimension of a large bearing diameter standard part based on coordinate measurement according to claim 1, characterized in that: It also includes step S07: By repeatedly measuring the radial dimension of a large bearing diameter standard part and processing the data from multiple measurements, the measured value φ was obtained. 检 And measurement uncertainty, and mark the detection location.

3. The method for detecting the radial dimension of a large bearing diameter standard part based on coordinate measurement according to claim 1, characterized in that: In steps S01 and S02, By collecting the end face elements and diameter circle elements of the diameter standard part, a rectangular coordinate system parallel to the machine coordinate system is set on the end face of the diameter standard part. The origin of the rectangular coordinate system's X-axis, Y-axis, and Z-axis is set at the center of the projection circle of the diameter circle of the diameter standard part onto the end face.

4. The method for detecting the radial dimension of a large bearing diameter standard part based on coordinate measurement according to claim 1, characterized in that: In step S01, the coordinate measuring machine is manually operated to collect the coordinate information of three measuring points on the end face representing the surface element on the diameter standard part and the coordinate information of three measuring points on the diameter circular surface representing the circle element to initially establish the workpiece coordinate system.

5. The method for detecting the radial dimension of a large bearing diameter standard part based on coordinate measurement according to claim 1, characterized in that: In step S02, the coordinate information of three or more measurement points on the end face of the representative surface element of the diameter standard part and the coordinate information of three or more measurement points on the diameter circle surface of the representative circle element are collected by the automatic program operation coordinate measuring machine to accurately establish the workpiece coordinate system. Under the automatic establishment of the workpiece coordinate system, the coordinate information of the measurement points on the diameter circle to be measured at a certain distance h from the end face is automatically collected to obtain the diameter φ and circular error t of the circle at the specified position, and the detection area is determined according to the change of the circular error of the diameter circle to be measured.

6. The method for detecting the radial dimension of a large bearing diameter standard part based on coordinate measurement according to claim 1, characterized in that: In steps S04 and S05, a large number of points are collected on the circle at the specified position, and the circle element at the specified position is obtained by scanning. The diameter φ and circular error t of the circle at the specified position are then obtained.

7. The method for detecting the radial dimension of a large bearing diameter standard part based on coordinate measurement according to claim 2, characterized in that: During this process, more than 10 measurements are performed on two corresponding radial measurement points. Data processing is then performed on the multiple measurements to obtain the detection value φ for the two corresponding measurement points. 检 The measurement uncertainty of this test is given, and the test location is marked.

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