Coordinate measuring ball measuring tool

By designing a coordinate measuring ball measuring tool for including a main bracket, aligning detection rod and a restraint, the problem of difficulty in directly measuring the circularity error of the 45° position in the prior art is solved, and efficient and low-cost roundness error measurement is achieved, which is suitable for coordinate measuring balls of different specifications and models.

CN222689137UActive Publication Date: 2025-03-28SUZHOU INST OF MEASUREMENT & TESTING TECH
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Patent Information

Application Number
CN202420824751.4
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-04-20
Publication Date
2025-03-28
Estimated Expiration
2034-04-20

AI Technical Summary

Technical Problem

The prior art is difficult to directly measure the cross-sectional roundness error at the 45° position of the coordinate measuring ball, resulting in the need of special fixtures and indexing disk devices, increasing manufacturing cost and storage space.

Method used

A coordinate measuring ball measuring tool is designed, including a main bracket, a alignment detection rod and a restraint. By setting the coordinate measuring ball on a 45° inclined V-shaped groove, and using the alignment detection rod for pre-alignment, the cross-section at the 45° position is converted to a horizontal state, to achieve accurate measurement of circularity error.

Benefits of technology

The roundness error measurement and detection of coordinate measurement balls of different specifications and models is realized, reducing manufacturing cost and storage space, and has a compact structure, small space and strong versatility.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model provides a coordinate measuring ball measuring tool. The coordinate measuring ball measuring tool comprises a main support, an alignment detection rod and a binding piece. The main support comprises a trapezoid frame body and a clamping positioning column, the included angle between the left frame edge and the lower frame edge and the included angle between the right frame edge and the lower frame edge are 45 degrees, and V-shaped grooves are formed in the side faces of the left frame edge and the right frame edge; and the alignment detection rod is inserted into the through hole of the upper frame edge. The cross section B of the 45-degree position and the cross section C of the-45-degree position of the ball body of the coordinate measuring ball are converted into a horizontal state through the left frame edge and the right frame edge which are inclined by 45 degrees; pre-alignment is carried out through the alignment detection bar, so that the eccentricity of the coordinate measuring ball and the gyration center of the roundness measuring instrument after installation is kept in a small range and is controlled in the self eccentricity adjusting capacity range of the roundness measuring instrument, and the roundness error of the coordinate measuring ball can be accurately and rapidly calibrated by using the roundness measuring instrument. The measuring tool is compact in structure, small in occupied space, low in cost, capable of being suitable for roundness error detection of coordinate measuring balls of different specifications and models, and high in universality.
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Description

Technical Field

[0001] The utility model relates to the technical field of standard ball testing, in particular to a coordinate measuring ball measuring tool. Background Art

[0002] Coordinate measuring balls are used to calibrate or calibrate coordinate measuring machines, CNC machine tools and other length measuring instruments. According to the national metrology technical specification JJF1422-2013 "Coordinate measuring ball calibration specification", in its section 6.3, the current error (roundness error) of the coordinate measuring ball, it is required that the roundness error should be measured on three cross sections of the coordinate measuring ball for the first calibration, as shown in the attached figure. Figure 1 As shown, a roundness meter is required to measure the roundness error of the ball at sections A (0° position), B (45° position) and C (-45° position). For section A, it is only necessary to clamp the coordinate measuring ball on the claw plate of the roundness meter to measure. However, sections B and C, which are inclined at 45°, cannot be measured directly. Generally, a dividing plate device is used in combination with a special fixture for measurement, and each specification and model of coordinate measuring ball needs to be equipped with a matching special fixture, resulting in high manufacturing costs and large storage space. Utility Model Content

[0003] In order to overcome the above-mentioned deficiencies in the prior art, the purpose of the utility model is to provide a coordinate measuring ball measuring tool.

[0004] In order to achieve the above-mentioned purpose, the technical solution adopted by the utility model to solve the technical problem is: a coordinate measuring ball measuring tool, comprising:

[0005] A main bracket, comprising a trapezoidal frame and a clamping and positioning column, the trapezoidal frame comprising an upper frame side, a left frame side, a right frame side and a lower frame side, a through hole vertically penetrating from top to bottom is provided in the middle position of the upper frame side, the left frame side and the right frame side are both arranged at an angle of 45° with the lower frame side, and a concave V-shaped groove is provided on the side surface of the left frame side and the right frame side, the clamping and positioning column is fixedly connected below the middle position of the lower frame side, and the clamping and positioning column is coaxially arranged with the through hole; the cylindrical portion of the coordinate measuring ball to be measured is arranged in the V-shaped groove of the left frame side or the V-shaped groove of the right frame side;

[0006] An alignment detection rod, which is plugged into the through hole on the upper frame edge;

[0007] The binding member is used to bind the coordinate measuring ball to be measured after the position is adjusted to the left frame edge or the right frame edge.

[0008] When in use, first press the coordinate measuring ball to be measured against the V-groove on the left or right frame edge, move the coordinate measuring ball to be measured along the length direction of the V-groove, and at the same time lift the alignment probe rod upward to contact the sphere of the coordinate measuring ball, visually confirm the contact point position, and when the contact point is located at the center position of the alignment probe rod, it indicates that the sphere center of the coordinate measuring ball is close to or located at the axis position of the clamping positioning column. The technical solution of the utility model is adopted, by setting the coordinate measuring ball on the left or right frame edge inclined at 45°, the section B at the 45° position and the section C at the -45° position of the sphere of the coordinate measuring ball are converted to a horizontal state; the alignment probe rod is used for pre-alignment, so that the eccentricity of the coordinate measuring ball after installation and the rotation center of the roundness meter is kept within a small range and controlled within the range of the roundness meter's own eccentricity adjustment capability, and the roundness meter can be used to accurately and quickly calibrate the roundness error of the coordinate measuring ball. The utility model has the advantages of compact structure, small space occupation, low cost, and can be used for roundness error measurement and detection of coordinate measuring balls of different specifications and models, and has strong versatility.

[0009] Furthermore, the through hole is a cylindrical hole, and the alignment detection rod is cylindrical.

[0010] Furthermore, the alignment detection rod and the through hole are matched with each other by a clearance fit.

[0011] Furthermore, the outer diameter of the alignment detection rod is 0.001 mm-0.1 mm smaller than the inner diameter of the through hole.

[0012] The above preferred solution is adopted to ensure that the alignment detection rod can move smoothly up and down, while reducing the deviation of the alignment detection rod in the vertical direction, thereby ensuring the alignment accuracy.

[0013] Furthermore, the length of the alignment detection rod is greater than the distance between the bottom surface of the upper frame edge and the upper surface of the lower frame edge.

[0014] By adopting the above preferred solution, when the alignment detection rod falls to the lowest position, it will not fall out of the trapezoidal frame, thereby improving the convenience of use.

[0015] Furthermore, the length of the alignment detection rod is less than or equal to the distance between the upper surface of the upper frame side and the upper surface of the lower frame side.

[0016] By adopting the above preferred solution, when the alignment detection rod falls to the lowest position, the top end does not exceed the upper surface of the upper frame edge, and does not hinder the downward movement of the coordinate measuring ball.

[0017] Furthermore, the angle formed by the two walls of the V-shaped groove is 90°-150°.

[0018] By adopting the above preferred solution, the space of the groove body can be better utilized, ensuring that the cylindrical shaft of the coordinate measuring ball can maintain full contact with the two wall surfaces of the V-shaped groove.

[0019] Furthermore, the binding member is a cable tie, which binds and fixes the coordinate measuring ball to the left frame edge or the right frame edge.

[0020] By adopting the above preferred solution, after the position of the coordinate measuring ball is determined, the coordinate measuring ball is tied and fixed to the measuring tooling by a cable tie, and the fixing effect is good.

[0021] Furthermore, the binding member is an elastic band, which is connected to the left frame edge or the right frame edge, and the elastic band tightly binds the coordinate measuring ball to the left frame edge or the right frame edge.

[0022] By adopting the above preferred solution, a non-disposable elastic band is used, which can be reused.

[0023] Furthermore, hooks are provided on both side surfaces of the left frame edge and the right frame edge, the elastic band is in a loop shape, and both ends of the elastic band are respectively hooked on the hooks on the two side surfaces.

[0024] By adopting the above preferred solution, the elastic band can be hooked after the coordinate measuring ball moves to the target position so as not to affect the movement and alignment of the coordinate measuring ball. The elastic band is easy to hook and has high operation convenience. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0026] Figure 1 It is a schematic diagram of the structure of the coordinate measuring sphere.

[0027] Figure 2 It is a structural schematic diagram of an implementation method of the utility model.

[0028] Figure 3 It is a schematic diagram of the conversion of section B of the coordinate measuring sphere to a horizontal state.

[0029] Figure 4 It is a schematic diagram of the conversion of section C of the coordinate measuring sphere to a horizontal state.

[0030] Figure 5 This is a schematic diagram of using cable ties to fix the coordinate measuring ball.

[0031] Figure 6It is a schematic diagram of an implementation method of using an elastic band to constrain a coordinate measuring ball.

[0032] Figure 7 It is a schematic diagram of another implementation method of using an elastic band to constrain a coordinate measuring ball.

[0033] The numbers and letters in the figure represent the names of the corresponding parts:

[0034] 10-main bracket; 11-trapezoidal frame; 111-upper frame edge; 112-left frame edge; 113-right frame edge; 114-lower frame edge; 115-through hole; 116-V-shaped groove; 12-clamping positioning column; 20-alignment detection rod; 31-cable tie; 32-elastic belt; 33-hook; 40-coordinate measuring ball. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0036] like Figure 2-7 As shown, a coordinate measuring ball measuring tool comprises:

[0037] The main bracket 10 includes a trapezoidal frame 11 and a clamping and positioning column 12. The trapezoidal frame 11 includes an upper frame edge 111, a left frame edge 112, a right frame edge 113 and a lower frame edge 114. A through hole 115 is provided in the middle of the upper frame edge 111, and the left frame edge 112 and the right frame edge 113 are both arranged at an angle of 45° with the lower frame edge 114. A concave V-shaped groove 116 is provided on the side of the left frame edge 112 and the right frame edge 113. The clamping and positioning column 12 is fixedly connected below the middle of the lower frame edge 114, and the clamping and positioning column 12 is coaxially arranged with the through hole 115. The cylindrical portion of the coordinate measuring ball 40 to be measured is arranged in the V-shaped groove 116 of the left frame edge 112 or the V-shaped groove 116 of the right frame edge 113.

[0038] The alignment detection rod 20 is inserted into the through hole 115 on the upper frame edge;

[0039] The restraining member is used to restrain the coordinate measuring sphere 40 after the position is adjusted to the left frame edge 112 or the right frame edge 113 .

[0040] When in use, first press the coordinate measuring ball to be measured against the V-groove on the left or right frame edge, move the coordinate measuring ball to be measured along the length direction of the V-groove, and at the same time lift the alignment detection rod upward to contact the spherical body of the coordinate measuring ball, visually confirm the position of the contact point, when the contact point is located at the center position of the alignment detection rod, it indicates that the spherical center of the coordinate measuring ball is close to or located at the axis position of the clamping positioning column.

[0041] like Figure 3 As shown, by setting the coordinate measuring sphere 40 on the right frame side inclined at 45°, the section B at the 45° position of the sphere of the coordinate measuring sphere is converted to a horizontal state. Figure 4 As shown, by setting the coordinate measuring ball 40 on the left frame edge inclined at 45°, the section C of the coordinate measuring ball at the -45° position is converted to a horizontal state. The beneficial effect of adopting the above technical solution is: by pre-aligning the alignment probe rod, the eccentricity of the coordinate measuring ball with the rotation center of the roundness meter after installation is kept within a small range and controlled within the eccentricity adjustment capability of the roundness meter itself, and the roundness meter can be used to accurately and quickly calibrate the roundness error of the coordinate measuring ball. The measuring tool of the utility model has a compact structure, small space occupation, low cost, and can be applied to the roundness error measurement and detection of coordinate measuring balls of different specifications and models, and has strong versatility.

[0042] In some other embodiments of the present invention, the through hole 115 is a cylindrical hole, and the alignment detection rod 20 is cylindrical.

[0043] In other embodiments of the present invention, the alignment detection rod 20 and the through hole 115 are matched with a clearance fit. The outer diameter of the alignment detection rod 20 is 0.001mm-0.1mm smaller than the inner diameter of the through hole 115. The beneficial effect of adopting the above technical solution is: ensuring that the alignment detection rod can move up and down smoothly, while reducing the deviation of the alignment detection rod in the vertical direction, ensuring the alignment accuracy.

[0044] In other embodiments of the present invention, the length of the alignment detection rod 20 is greater than the distance between the bottom surface of the upper frame edge 111 and the upper surface of the lower frame edge 114. The beneficial effect of the above technical solution is that when the alignment detection rod falls to the lowest position, it will not fall out of the trapezoidal frame, thereby improving the convenience of use.

[0045] In some other embodiments of the present invention, the length of the alignment detection rod 20 is less than or equal to the distance between the upper surface of the upper frame edge 111 and the upper surface of the lower frame edge 114. The beneficial effect of adopting the above technical solution is that when the alignment detection rod falls to the lowest position, the top end does not exceed the upper surface of the upper frame edge, and does not hinder the downward movement of the coordinate measuring ball.

[0046] In other embodiments of the present invention, the angle between the two walls of the V-shaped groove 116 is 90°-150°. The beneficial effect of the above technical solution is that the groove space can be better utilized to ensure that the cylindrical shaft of the coordinate measuring ball can maintain full contact with the two walls of the V-shaped groove.

[0047] like Figure 5 As shown, in some other embodiments of the present invention, the binding member is a cable tie 31, and the cable tie 31 binds and fixes the coordinate measuring ball 40 to the left frame edge or the right frame edge. The beneficial effect of adopting the above technical solution is that after the position of the coordinate measuring ball is determined, the coordinate measuring ball is bound and fixed to the measuring tooling by the cable tie, and the fixing effect is good.

[0048] like Figure 6 As shown, in some other embodiments of the present invention, the binding member is an elastic band 32, which is connected to the left frame edge or the right frame edge, and the elastic band 32 tightly binds the coordinate measuring ball 40 to the left frame edge or the right frame edge. The beneficial effect of adopting the above technical solution is: the elastic band is not disposable and can be reused.

[0049] like Figure 7 As shown, in some other embodiments of the present invention, hooks 33 are provided on both sides of the left frame edge and the right frame edge, the elastic band 32 is in a loop shape, and both ends of the elastic band 32 are respectively hooked on the hooks 33 on the two sides. The beneficial effect of adopting the above technical solution is that the elastic band can be hooked after the coordinate measuring ball moves to the target position so as not to affect the movement and alignment of the coordinate measuring ball, the elastic band is convenient to hook, and the operation is convenient.

[0050] The above embodiments are only for illustrating the technical concept and features of the utility model, and their purpose is to enable ordinary technicians in the field to understand the content of the utility model and implement it. They cannot be used to limit the protection scope of the utility model. All equivalent changes or modifications made according to the spirit of the utility model should be included in the protection scope of the utility model.

Claims

1. A coordinate measuring ball measuring tool, characterized in that: include: A main bracket, comprising a trapezoidal frame and a clamping and positioning column, the trapezoidal frame comprising an upper frame side, a left frame side, a right frame side and a lower frame side, a through hole vertically penetrating from top to bottom is provided in the middle position of the upper frame side, the left frame side and the right frame side are both arranged at an angle of 45° with the lower frame side, and a concave V-shaped groove is provided on the side surface of the left frame side and the right frame side, the clamping and positioning column is fixedly connected below the middle position of the lower frame side, and the clamping and positioning column is coaxially arranged with the through hole; the cylindrical portion of the coordinate measuring ball to be measured is arranged in the V-shaped groove of the left frame side or the V-shaped groove of the right frame side; An alignment detection rod, which is plugged into the through hole on the upper frame edge; The binding member is used to bind the coordinate measuring ball to be measured after the position is adjusted to the left frame edge or the right frame edge.

2. The coordinate measuring ball measuring tool according to claim 1, characterized in that: The through hole is a cylindrical hole, and the alignment detection rod is cylindrical.

3. The coordinate measuring ball measuring tool according to claim 2, characterized in that: The alignment detection rod and the through hole are matched with each other by a clearance fit.

4. The coordinate measuring ball measuring tool according to claim 3, characterized in that: The outer diameter of the alignment detection rod is 0.001 mm-0.1 mm smaller than the inner diameter of the through hole.

5. The coordinate measuring ball measuring tool according to claim 1, characterized in that: The length of the alignment detection rod is greater than the distance between the bottom surface of the upper frame edge and the upper surface of the lower frame edge.

6. The coordinate measuring ball measuring tool according to claim 5, characterized in that: The length of the alignment detection rod is less than or equal to the distance between the upper surface of the upper frame side and the upper surface of the lower frame side.

7. The coordinate measuring ball measuring tool according to claim 1, characterized in that: The angle formed by the two walls of the V-shaped groove is 90°-150°.

8. The coordinate measuring ball measuring tool according to claim 1, characterized in that: The binding member is a cable tie, which binds and fixes the coordinate measuring ball on the left frame edge or the right frame edge.

9. The coordinate measuring ball measuring tool according to claim 1, characterized in that: The binding member is an elastic band connected to the left frame edge or the right frame edge, and the elastic band tightly binds the coordinate measuring ball to the left frame edge or the right frame edge.

10. The coordinate measuring ball measuring tool according to claim 9, characterized in that: Hooks are arranged on both side surfaces of the left frame edge and the right frame edge, the elastic band is in a ring shape, and the two ends of the elastic band are respectively hooked on the hooks on the two side surfaces.