Straightness standard device

Abstract

The utility model provides a straightness standard device which comprises a standard device body, a first support and a second support, the standard device body is in a horizontally arranged cuboid strip shape, the standard device body is made of silicon carbide ceramics, the top face of the standard device body is a finish machining working face, and one of the left side face and the right side face of the standard device body is a finish machining working face. And the first support and the second support are respectively supported at two Airy point positions of the etalon body. According to the straightness standard device, the standard device body is made of the silicon carbide ceramic material, the silicon carbide ceramic material is free of gaps and high in rigidity, and the influence of environment temperature and humidity on the deformation amount is small, so that the standard device body is high in rigidity, small in deformation amount, good in stability and high in precision, and correspondingly, the precision of a finish machining working face is high. When the straightness standard device provided by the utility model is used for checking, only the two finish machining working surfaces need to be measured, so that the checking process is simplified, the checking efficiency is improved, and the measurement precision of a three-coordinate measuring machine can be correspondingly improved.

Description

Technical Field

[0001] This utility model belongs to the field of precision measurement technology, specifically relating to a straightness standard for calibrating the straightness of precision parts or precision equipment. Background Technology

[0002] As a precision measuring instrument, the coordinate measuring machine (CMM) is one of the earliest intelligent inspection devices developed in the industrial field. It has high measurement accuracy and strong anti-interference ability, and is widely used in the manufacturing industry for measuring and inspecting parameters such as part dimensions and behavioral tolerances.

[0003] As a key precision measurement device in manufacturing, the measurement accuracy of a coordinate measuring machine (CMM) directly affects product quality and production efficiency. To ensure the long-term stable and reliable operation of the CMM, it is necessary to perform regular calibration and maintenance to guarantee its measurement accuracy and stability, meeting the stringent requirements of the manufacturing industry for product quality inspection.

[0004] In the calibration process of coordinate measuring machines (CMMs), straightness is one of the commonly used calibration standards. Straightness reflects the linear accuracy of the movement of each coordinate axis of the CMM and is an important indicator for evaluating the geometric accuracy of the machine.

[0005] The straightness calibration of a coordinate measuring machine (CMM) typically uses a straightness standard. Traditional straightness standards usually consist of a long, rectangular standard body and a support. The standard body is made of alumina ceramic, which has poor rigidity and stability, resulting in low machining accuracy, poor rigidity, and generally low stability. Therefore, calibration requires two measurements on the upper working surface (measuring the vertical component of straightness) of the standard body (forward and reverse), and the side working surface (measuring the horizontal component of straightness) also requires two measurements to improve calibration accuracy. This necessitates rotating the standard body 180° so that the upper working surface faces upward for forward measurement, then downward for reverse measurement; and the side working surface faces right (or left) for forward measurement, then left (or right) for reverse measurement. This requires a rotating mechanism on the support to achieve the rotation of the standard body, resulting in a complex structure for existing straightness standards.

[0006] Furthermore, both the upper working surface and the side working surface require measurements in both directions. The deviation value is then calculated using a specific algorithm based on the measurements in both directions, resulting in a complex verification process, low verification efficiency, and large cumulative errors. Summary of the Invention

[0007] This invention provides a straightness standard that is highly accurate, simple in structure, and efficient in calibration.

[0008] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is a straightness standard, comprising:

[0009] The standard body is a horizontally set rectangular strip. The material of the standard body is silicon carbide ceramic. Its top surface is a precision-machined working surface, and one of its left and right sides is a precision-machined working surface.

[0010] The first support and the second support are located below the standard body, and the first support and the second support are respectively supported at two Ally points on the standard body.

[0011] The technical solution of this utility model also includes the following additional technical features:

[0012] The first support includes a first support body and a first support member fixed on the horizontal top surface of the first support body, wherein a ball socket is formed on the first support member;

[0013] The second support includes a second support body and a second support member fixed on the horizontal top surface of the second support body, the second support member having a horizontal support top surface;

[0014] A first ball head is provided on the bottom surface of the standard body at the Avery point position corresponding to the first support, and the first ball head fits into the ball socket.

[0015] Two second ball heads are provided on the bottom surface of the standard body at the Avery point position corresponding to the second support, and the second ball heads are supported on the horizontal support top surface of the second support member.

[0016] In a direction parallel to the length direction of the standard body, the mounting position of the first support member on the horizontal top surface of the first support is adjustable, and the mounting position of the second support member on the horizontal top surface of the second support is adjustable.

[0017] The straightness standard also includes a worktable with a horizontal top surface, and the first support and the second support are mounted on the horizontal top surface of the worktable.

[0018] The mounting positions of the first support and the second support on the horizontal top surface of the workbench are adjustable in a direction parallel to the length direction of the standard body.

[0019] The standard instrument body is a hollow structure with both ends open.

[0020] The bottom surface and one of the left and right sides of the standard instrument body are unfinished surfaces, and markings are provided on the unfinished surfaces.

[0021] Compared with the prior art, the present invention has the following advantages and positive effects:

[0022] 1. The present invention relates to a straightness standard, comprising a standard body and a first support and a second support at two Ally points on the standard body. The standard body is made of silicon carbide ceramic, which is a high-rigidity material silicon carbide manufactured by sintering technology. This material has zero porosity, high rigidity, small deformation, and minimal impact of ambient temperature and humidity on its stability. As a result, the standard body has high rigidity, small deformation, and good stability, leading to high precision. Correspondingly, the precision of the finished working surface is high. During calibration, only one direction of measurement needs to be performed on each of the two finished working surfaces, simplifying the calibration process and improving calibration efficiency.

[0023] 2. Since the calibration only requires measuring the two precision-machined working surfaces of the standard body in one direction, such as the forward measurement, the straightness standard does not need to have a rotating mechanism to achieve the rotation of the standard body as in the existing technology, which greatly simplifies the standard structure and reduces production costs. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of this utility model 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 some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 This is a perspective view of the straightness standard in an embodiment of this utility model;

[0026] Figure 2 for Figure 1 Top view;

[0027] Figure 3 for Figure 2 An enlarged view of the AA sectional view after rotating it 90° counterclockwise;

[0028] Figure 4 for Figure 2 An enlarged view of the BB cross-section after rotating 90° clockwise;

[0029] Figure 5 This is a perspective view of the assembly structure of the first support, the second support, and the worktable in an embodiment of this utility model;

[0030] Figure 6 for Figure 5 Enlarged view of part C.

[0031] Figure label:

[0032] 10. Standard instrument body; 11. Top surface; 12. Right side surface; 13. Bottom surface; 14. Left side surface; 15. First ball head; 16. Second ball head; 17. Raised mark;

[0033] 20. First support; 21. First support body; 22. First support member; 23. Ball socket; 24. First screw hole; 25. First mounting hole;

[0034] 30. Second support; 31. Second support body; 32. Second support member; 33. Top surface of horizontal support; 34. Second mounting hole;

[0035] 40. Workbench. Detailed Implementation

[0036] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0037] Furthermore, the technical features involved in the different embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.

[0038] Reference Figure 1 In some embodiments of this utility model, a straightness standard includes a standard body 10, a first support 20, and a second support 30.

[0039] The standard body 10 is horizontally positioned and is a rectangular strip made of silicon carbide ceramic. Of the four circumferential sides of the standard body 10, opposite sides are parallel and symmetrical, and adjacent sides are perpendicular. The top surface 11 is a precision-machined working surface, and one of the left or right sides is also a precision-machined working surface, for example... Figure 1 As shown, the top surface 11 and the right side surface 12 of the standard instrument body 10 are precision-machined working surfaces.

[0040] The first support 20 and the second support 30 are located below the standard body 10 and are spaced apart along the length of the standard body 10, jointly supporting the standard body 10. The first support 20 and the second support 30 are respectively located at two Airy points on the standard body 10. The Airy point is a position on the rod-shaped member 0.211L (L is the length of the rod-shaped member) from each of its two end faces. Supporting the object at the Airy point position ensures that the two end faces of a horizontally placed object remain parallel under the action of gravity.

[0041] In this embodiment, the straightness standard body 10 is made of silicon carbide ceramic. Silicon carbide ceramic is a high-rigidity material silicon carbide manufactured by sintering technology. This material has zero porosity, high rigidity, small deformation, and little influence on its stability by ambient temperature and humidity, i.e., good stability. Therefore, the standard body 10 has high rigidity, small deformation, and good stability, resulting in high precision. Correspondingly, the precision of the finished working surface is high. When used for calibration by a coordinate measuring machine, only one measurement needs to be performed on each of the two finished working surfaces of the standard body 10, thereby simplifying the calibration process and improving calibration efficiency.

[0042] Furthermore, when using the straightness standard in this embodiment for calibration of a coordinate measuring machine, since only one measurement is needed on each of the two precision-machined working surfaces of the standard body 10, the straightness standard does not need to be equipped with a rotation mechanism to achieve the rotation of the standard body 10 as in the prior art, which greatly simplifies the standard structure and reduces production costs.

[0043] During the machining of the standard instrument body 10, it is subjected to real-time testing using a high-resolution optical collimator in a constant temperature and humidity environment. Based on the test results, it is repeatedly ground and processed until the required ultra-high precision is achieved.

[0044] This utility model has a high accuracy straightness standard, and by using it to verify the straightness accuracy of a coordinate measuring machine, the measurement accuracy of the coordinate measuring machine can be improved.

[0045] In some embodiments of this utility model, reference is made to Figures 2 to 6 At the same time, combined Figure 1 The first support 20 includes a first support body 21 and a first support member 22 fixed on the horizontal top surface 11 of the first support body 21. A ball socket 23 is formed on the first support member 22.

[0046] The second support 30 includes a second support body 31 and a second support member 32 fixed on the horizontal top surface 11 of the second support body 31. The second support member 32 has a horizontal support top surface 33.

[0047] A first ball head 15 is provided on the bottom surface 13 of the standard body 10 at the Avery point position corresponding to the first support 20, and the first ball head 15 fits in the ball socket 23; two second ball heads 16 are provided on the bottom surface 13 of the standard body 10 at the Avery point position corresponding to the second support 30, and the second ball heads 16 are supported on the horizontal support top surface 33 of the second support member 32.

[0048] The standard body 10 is positioned at one Avery point and the first support 20 using a ball joint and a socket. The other Avery point is positioned at two ball joints and a horizontal surface to cooperate with the second support 30. Under the premise of achieving reliable support at three points, it has a certain expansion space compared with fixed support, which can reduce the linear expansion of the standard body 10 caused by temperature rise and other reasons, and avoid deformation caused by the two ends being fixed and the center bulging.

[0049] During the fine-tuning, precision testing and use stages, the standard body 10 is supported by the three-point support mentioned above to maintain the consistent posture of the standard body 10 during use and processing, and to ensure minimal deformation.

[0050] In some embodiments of this utility model, the installation position of the first support member 22 on the horizontal top surface of the first support 20 is adjustable in a direction parallel to the length direction of the standard body 10, and the installation position of the second support member 32 on the horizontal top surface of the second support 30 is adjustable, so that the installation positions of the first support member 22 and the second support member 32 can be changed according to the standard body 10 of different lengths, thereby improving versatility.

[0051] Specifically, the first support member 22 is fastened to the horizontal top surface of the first support 20 by screws, and the second support member 32 is also fastened to the horizontal top surface of the second support 30 by screws. Multiple first screw holes 24 (the first screw holes on the second support 30 are obscured by the second support member 32 and not shown) can be provided on the first support 20 and the second support 30 at intervals along a direction parallel to the length of the standard body 10. This allows for the selection of appropriate positions of the first screw holes 24 to install the first support member 22 and the second support member 32 according to different lengths of the standard body 10, thus achieving adjustable installation positions.

[0052] In some embodiments of this utility model, such as Figure 1 , Figure 2 and Figure 5 As shown, the straightness standard also includes a worktable 40, which has a horizontal top surface. The first support 20 and the second support 30 are installed on the horizontal top surface of the worktable 40, so that the first support 20, the second support 30 and the worktable 40 form a whole, which is convenient for overall handling and movement, and convenient for the whole to be placed on the coordinate measuring machine to be calibrated.

[0053] In some embodiments of this utility model, the installation positions of the first support 20 and the second support 30 on the horizontal top surface of the workbench 40 are adjustable in a direction parallel to the length direction of the standard body 10. This allows the installation positions of the first support 20 and the second support 30 to be changed according to the different lengths of the standard body 10. By adjusting the positions of the first support 20 and the second support 30 and the first support member 22 and the second support member 32, the adjustment range can be expanded, thereby improving the convenience of adjustment.

[0054] Specifically, the first support 20 is fastened to the horizontal top surface of the workbench 40 with screws, and the second support 30 is also fastened to the horizontal top surface of the workbench 40 with screws. The first mounting hole 25 on the first support 20 can be configured as an elongated screw hole, and the second mounting hole 34 on the second support 30 can be configured as an elongated screw hole, with the length direction of the elongated screw holes parallel to the length direction of the standard body 10. This allows for the selection of appropriate positions to fix the first support 20 and the second support 30 according to different lengths of the standard body 10, thus achieving adjustable installation positions.

[0055] In some embodiments of this utility model, the standard body 10 is a hollow structure with both ends open. While ensuring the good rigidity of the silicon carbide ceramic standard body 10, lightweight design is achieved, minimizing the risk of deformation due to excessive weight.

[0056] Because the bottom surface 13 and the other side surface of the standard body 10, excluding the finishing working surface (such as...) Figure 1 If the left side 14 shown is a non-working surface, then the bottom surface 13 and the left side 14 of the standard body 10 can be set as non-finished surfaces to reduce processing costs.

[0057] To facilitate differentiation, markings can be placed on non-machined surfaces to indicate that this is a non-working surface and avoid accidental operation. For example... Figure 1 A raised mark 17 is provided on the left side 14 of the standard instrument body 10, and the first ball head 15 and the second ball head 16 on the bottom surface 13 of the standard instrument body 10 can also be used as marks on the bottom surface 13.

[0058] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A straightness standard, characterized in that, include: The standard body is a horizontally set rectangular strip. The material of the standard body is silicon carbide ceramic. Its top surface is a precision-machined working surface, and one of its left and right sides is a precision-machined working surface. The first support and the second support are located below the standard body, and the first support and the second support are respectively supported at two Ally points on the standard body.

2. The straightness standard according to claim 1, characterized in that, The first support includes a first support body and a first support member fixed on the horizontal top surface of the first support body, wherein a ball socket is formed on the first support member; The second support includes a second support body and a second support member fixed on the horizontal top surface of the second support body, the second support member having a horizontal support top surface; A first ball head is provided on the bottom surface of the standard body at the Avery point position corresponding to the first support, and the first ball head fits into the ball socket. Two second ball heads are provided on the bottom surface of the standard body at the Avery point position corresponding to the second support, and the second ball heads are supported on the horizontal support top surface of the second support member.

3. The straightness standard according to claim 2, characterized in that, In a direction parallel to the length direction of the standard body, the mounting position of the first support member on the horizontal top surface of the first support is adjustable, and the mounting position of the second support member on the horizontal top surface of the second support is adjustable.

4. The straightness standard according to claim 1, characterized in that, Also includes: A workbench having a horizontal top surface, wherein the first support and the second support are mounted on the horizontal top surface of the workbench.

5. The straightness standard according to claim 4, characterized in that, The mounting positions of the first support and the second support on the horizontal top surface of the workbench are adjustable in a direction parallel to the length direction of the standard body.

6. The straightness standard according to claim 1, characterized in that, The standard instrument body is a hollow structure with both ends open.

7. The straightness standard according to claim 1, characterized in that, The bottom surface and one of the left and right sides of the standard instrument body are unfinished surfaces, and markings are provided on the unfinished surfaces.

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