CN216621043U

CN216621043U - Aligning and positioning device in X-ray three-dimensional dimension measurement system

Info

Publication number: CN216621043U
Application number: CN202220203988.1U
Authority: CN
Inventors: 陆秋龙; 王云祥
Original assignee: Suzhou Institute Of Metrology
Current assignee: Suzhou Institute Of Metrology
Priority date: 2022-01-25
Filing date: 2022-01-25
Publication date: 2022-05-27
Anticipated expiration: 2032-01-25

Abstract

The utility model provides a self-aligning positioning device in an X-ray three-dimensional dimension measuring system, and relates to the technical field of industrial CT measurement. The device comprises a polished rod and two bases, wherein two ends of each base are respectively provided with guide holes which are same in size and are arranged in parallel, the polished rod and the guide holes are arranged in a clearance fit manner, the side surface of the guide hole of each base is provided with a V-shaped groove, and each V-shaped groove is formed by a plurality of sub V-shaped grooves with different sizes and depths; when the aligning and positioning device is used, the two bases are flatly placed on the sample table, the polished rod penetrates through one guide hole in each base, the V-shaped grooves in the two bases are arranged face to face, and a sample to be measured is fixed through the V-shaped grooves. The device can fix the test balls with different sizes by using the V-shaped grooves with different sizes, the test balls can be clamped by the boundaries of the V-shaped grooves with different specifications, the connecting line of the test balls is along the direction of the cross-rod distance, the aligning and positioning effects are achieved, and the accuracy and the consistency of measurement are ensured.

Description

Aligning and positioning device in X-ray three-dimensional dimension measurement system

Technical Field

The utility model relates to the technical field of industrial CT measurement, in particular to an aligning and positioning device in an X-ray three-dimensional dimension measurement system.

Background

An X-ray coordinate measuring machine, also known as an industrial CT, employs an X-ray three-dimensional measurement system in the process of measuring a sample. The sample stage in the measuring system is not equipped with a special clamp, so that the sample is difficult to fix. The stability and the reliability of a sample measured value are difficult to ensure when the sample measurement is carried out, the test difficulty is increased, and the test stability is reduced.

When the relevant workpiece products are measured by industrial CT, most of the products can be directly measured. But encounter some workpieces, such as helical splines, and encounter measurement difficulties. The helical spline mainly calibrates parameters such as a span length, a major diameter and a minor diameter to indirectly reflect parameters such as a tooth groove width. The measurement of the span of the helical spline is realized by a measuring ball, and the measuring ball cannot be fixed when the measuring ball is measured by industrial CT, so that the measurement of the workpiece is difficult when the workpiece is measured by the industrial CT.

Therefore, it is necessary to provide a self-aligning positioning device in an X-ray three-dimensional dimension measuring system to fix a ball sample for assisting measurement.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a self-aligning positioning device in an X-ray three-dimensional dimension measuring system to solve the problem of fixing a measuring ball sample during industrial CT measurement, aiming at overcoming the defects of the prior art.

In order to achieve the purpose, the technical scheme adopted by the utility model is as follows:

the utility model provides an aligning and positioning device in an X-ray three-dimensional size measuring system, which comprises a polished rod and two bases, wherein two ends of each base in the two bases are respectively provided with guide holes which are same in size and are arranged in parallel, the penetrating direction of each guide hole is vertical to the extending direction of each base, the polished rod and the guide holes are arranged in a clearance fit manner, a V-shaped groove is arranged on the side surface of the guide hole of each base, the extending direction of the V-shaped groove is the same as that of the bases, and the V-shaped groove on each base is formed by a plurality of sub V-shaped grooves with different size depths;

when the aligning and positioning device is used, the two bases are flatly placed on a sample table of an X-ray three-dimensional size measuring system, the polished rod penetrates through one guide hole in each base respectively, the V-shaped grooves in the two bases are arranged face to face, the sub V-shaped grooves in the corresponding positions in the two bases are identical in size and depth, and samples to be measured are fixed through the V-shaped grooves in the two bases.

Optionally, the polish rod and both mounts are made of SKD11 material.

Optionally, both bases are cuboid shaped.

Optionally, the polished rod has a clearance from the guide hole of less than 5 microns and a verticality of less than 5 microns.

Optionally, the flatness of each of the two bases is less than 5 μm perpendicular to its respective side.

Optionally, the depth dimensions of the plurality of sub V-shaped grooves decrease sequentially from one end of the corresponding base to the other end.

Optionally, the depth dimensions of two adjacent sub-V-shaped grooves in the plurality of sub-V-shaped grooves are different by 0.5 mm.

Optionally, the number of the sub-V-grooves in each V-groove is 8.

Optionally, each sub V-shaped groove has a cross-sectional shape of an isosceles right triangle.

Optionally, two rows of V-shaped grooves are arranged in parallel on each base.

The beneficial effects of the utility model include:

the utility model provides a self-aligning positioning device which comprises a polished rod and two bases, wherein two ends of each base in the two bases are respectively provided with guide holes which are same in size and are arranged in parallel, the penetrating direction of each guide hole is vertical to the extending direction of each base, the polished rod and the guide holes are arranged in a clearance fit manner, a V-shaped groove is arranged on the side surface of the opening of each guide hole of each base, the extending direction of the V-shaped groove is the same as that of the base, and the V-shaped groove on each base is formed by a plurality of sub V-shaped grooves with different sizes and depths; when the aligning and positioning device is used, the two bases are flatly placed on a sample table of an X-ray three-dimensional size measuring system, the polished rod penetrates through one guide hole in each base respectively, the V-shaped grooves in the two bases are arranged face to face, the sub V-shaped grooves in the corresponding positions in the two bases are identical in size and depth, and samples to be measured are fixed through the V-shaped grooves in the two bases. The device can fix the test balls with different sizes by using the V-shaped grooves with different sizes, the test balls can be clamped by the boundaries of the V-shaped grooves with different specifications, the connecting line of the test balls is along the direction of the cross-rod distance, the aligning and positioning effects are achieved, and the accuracy and the consistency of measurement are ensured.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed for the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

Fig. 1 is a schematic structural diagram illustrating a self-aligning positioning device in an X-ray three-dimensional dimension measuring system according to an embodiment of the present invention;

FIG. 2 is a schematic side view of a base according to an embodiment of the present invention;

fig. 3 shows a schematic AA cross-section in fig. 2.

Reference numerals: 101-a polish rod; 121-a first base; 122-a second base; 131-a first guide hole; 132-a second pilot hole; 141-third guide holes; 142-a fourth pilot hole; 105-V type groove; 150-a first V-groove; 151-second V-groove.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the utility model, as claimed, but is merely representative of selected embodiments of the utility model. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or orientations or positional relationships that the products of the present invention are conventionally placed in use, and are only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the device or element to which the description refers must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

The X-ray coordinate measuring machine uses an X-ray three-dimensional size measuring system in the process of measuring a sample. The sample stage in the measurement system is not equipped with a special fixture, resulting in difficulty in fixing the sample. The stability and the reliability of a sample measured value are difficult to ensure when the sample measurement is carried out, the test difficulty is increased, and the test stability is reduced. Therefore, this application design has processed one set of aligning positioner, the supplementary measurement of carrying out the sample. The present application will take an industrial CT as an example of splines in a measurement workpiece to illustrate the features and methods of use of the present device.

Fig. 1 is a schematic structural diagram illustrating a self-aligning positioning device in an X-ray three-dimensional dimension measuring system according to an embodiment of the present invention; FIG. 2 is a schematic side view of a base according to an embodiment of the present invention; fig. 3 shows a schematic AA cross-section in fig. 2.

Referring to fig. 1 to 3, an embodiment of the present invention provides a self-aligning positioning device in an X-ray three-dimensional dimension measurement system, where the self-aligning positioning device includes a polished rod 101 and two bases, where the two bases include a first base 121 and a second base 122; two ends of each of the two bases are respectively provided with guide holes which have the same size and are arranged in parallel, for example, two ends of the first base 121 are respectively provided with a first guide hole 131 and a second guide hole 132; both ends of the second base 122 are provided with a third guide hole 141 and a fourth guide hole 142, respectively. The penetrating direction of the guide hole is perpendicular to the extending direction of each base, the polished rod 101 is arranged in clearance fit with the guide hole, a V-shaped groove 105 is arranged on the side face where the opening of the guide hole of each base is located, the extending direction of the V-shaped groove 105 is the same as the extending direction of the bases, and the V-shaped groove on each base is formed by a plurality of sub-V-shaped grooves with different sizes and depths.

When the aligning and positioning device is used, the two bases are flatly placed on a sample table of an X-ray three-dimensional size measuring system, the polished rod 101 penetrates through one guide hole on each base respectively, as shown in fig. 1, the polished rod 101 penetrates through the first guide hole 131 and the third guide hole 141 respectively, the V-shaped grooves on the two bases are arranged face to face, the sub V-shaped grooves on the two bases at corresponding positions are the same in size and depth, and a sample to be measured is fixed through the V-shaped grooves on the two bases.

The device can fix the test balls with different sizes by utilizing the V-shaped grooves with different sizes, the test balls can be clamped by the boundaries of the V-shaped grooves with different specifications, the connecting line of the test balls is along the direction of the cross-rod distance, the aligning and positioning effects are achieved, the measuring accuracy and consistency are ensured, and the measuring problem that the test balls are fixed when samples are measured by using industrial CT is solved.

Alternatively, the polish rod and both mounts may be made of SKD11 material. The selection of the material of the aligning positioning device mainly considers the following factors: 1) mass attenuation coefficient of X-rays. In the industrial CT, a three-dimensional image of a measured object is obtained according to different attenuation characteristics of different substances to X-rays. Selecting materials with smaller mass attenuation coefficients to ensure that the formed images can be separated from each other in the processing process; 2) coefficient of thermal expansion. The thermal expansion coefficient is an important index influencing the stability of the material. The material standard used for transferring the quantity value has the size which changes along with the change of temperature due to the difference of the used raw materials, and the size can affect the transferring precision of the quantity value; 3) a distribution of gray values. And selecting different thresholds according to the gray value to perform threshold segmentation on the broken image. When the threshold value is set to 0.03, the surface of the steel ball is measured to generate artifacts due to severe beam hardening, and the accuracy of the test is affected. High-density materials such as steel and the like, and low-power CT cannot ensure that rays penetrate through the materials, so that the imaging effect is influenced, and dimension measurement errors are caused. By combining the above and combining various factors such as the mass attenuation coefficient of X-rays, the thermal expansion coefficient of materials, the gray value, the processing technology maturity and the like, for the aligning positioning device in the X-ray three-dimensional size measurement system, the device is prepared by adopting the material SKD11 with moderate mass attenuation coefficient, relatively low thermal expansion coefficient, relatively low mass attenuation coefficient and relatively low thermal expansion coefficient.

Optionally, the two bases are cuboid, a gap between the polish rod and the guide hole is less than 5 microns, and the verticality is less than 5 microns. Optionally, the flatness of each of the two bases is less than 5 μm perpendicular to its respective side. Optionally, the depth dimensions of the plurality of sub V-shaped grooves decrease sequentially from one end of the corresponding base to the other end. Optionally, the depth dimensions of two adjacent sub-V-shaped grooves in the plurality of sub-V-shaped grooves are different by 0.5 mm.

Optionally, the number of the sub-V-grooves in each V-groove is 8. Optionally, each base is provided with two parallel rows of V-shaped grooves, as shown in fig. 2, for example, the first base 121 is provided with a first V-shaped groove 150 and a second V-shaped groove 151 in parallel; similarly, a third V-shaped groove and a fourth V-shaped groove are arranged in parallel on the second base 122. Optionally, as shown in fig. 3, each sub V-shaped groove has a cross-sectional shape of an isosceles right triangle. The section of the V-shaped groove is an isosceles right triangle, and the V-shaped groove is processed by using the processes of embedding and the like, so that the problem of processing the V-shaped groove is solved. The measuring range is adjusted by the length of the polished rod 101, and the design can basically cover the range of the common cross-rod distance.

In the practical use of the device, the base is flatly placed on a sample table of an industrial CT, and the polished rod is placed in the guide hole. And placing a workpiece to be measured, such as a spline, on a working platform of the industrial CT. And clamping the ball to be measured in the V-shaped groove and the spline tooth groove, and clamping the base. Measuring the measuring ball by using industrial CT to obtain a space three-dimensional image of the measuring ball, and obtaining the cross-ball distance by using professional analysis software carried in the industrial CT. This aligning positioner easy operation is swift, the facilitate promotion. The method can be used in coordinate instruments such as an X-ray coordinate measuring machine, a contact coordinate measuring machine, an image coordinate measuring machine and the like. The centering and positioning device is particularly suitable for centering and positioning of rotary measuring machines, such as a turntable, an X-ray coordinate measuring machine and the like.

The aligning and positioning device can well fix the measuring ball, the placing height between the measuring ball and the working platform can be adjusted through the pads and other high blocks, and the device is also provided with double rows of V-shaped grooves, so that the height adjustment is more flexible. In use, the heights of the measuring balls with different sizes in different V-shaped grooves can be recorded for inquiry, so that the measuring efficiency is improved. Especially for small-sized measuring balls, the imaging is inaccurate due to the undersize of the measuring balls during the industrial CT measurement, and the measurement error is larger. The distance between the surface and the surface of the end face of the V-shaped groove of the measuring clamp can be measured, the height of the measuring ball in different V-shaped grooves is combined, the distance between the measuring ball and the measuring ball is indirectly measured, and the measuring requirement can be met. This solves the difficult problem of measuring small-size measuring balls.

The aligning and positioning mechanism of the device enables the workpiece to be accurately positioned at the rotation center of the industrial CT measuring machine, so that larger magnification is obtained, the measuring result is more accurate while the detection efficiency is greatly improved, and the measuring capability and efficiency of the industrial CT in the workpiece measurement of the type are greatly improved.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. The aligning and positioning device in the X-ray three-dimensional size measuring system is characterized by comprising a polished rod and two bases, wherein two ends of each base in the two bases are respectively provided with guide holes which are same in size and are arranged in parallel, the penetrating direction of each guide hole is vertical to the extending direction of each base, the polished rod and the guide holes are arranged in a clearance fit mode, a V-shaped groove is arranged on the side face where the opening of each guide hole of each base is located, the extending direction of the V-shaped groove is the same as the extending direction of the bases, and the V-shaped groove on each base is formed by a plurality of sub V-shaped grooves with different size depths;

when the aligning and positioning device is used, the two bases are flatly placed on a sample table of an X-ray three-dimensional size measuring system, the polish rod penetrates through one guide hole in each base respectively, the V-shaped grooves in the two bases are arranged face to face, the sub V-shaped grooves in the corresponding positions on the two bases are the same in size and depth, and a sample to be measured is fixed through the V-shaped grooves in the two bases.

2. The self-aligning positioning device for X-ray three-dimensional dimension measurement system of claim 1, wherein said light rod and said two bases are made of SKD11 material.

3. The aligning positioning device for an X-ray three-dimensional dimension measuring system according to claim 1, wherein the two bases are each in a shape of a rectangular parallelepiped.

4. The aligning positioner of claim 3, wherein the gap between the polish rod and the guiding hole is less than 5 microns, and the verticality is less than 5 microns.

5. The self-aligning positioning device for an X-ray three-dimensional dimension measuring system according to claim 4, wherein the flatness of each of the two bases is less than 5 μm perpendicular to the side surfaces of the two bases.

6. The self-aligning positioning device of an X-ray three-dimensional size measuring system according to any one of claims 1 to 5, wherein the depth dimension of the plurality of sub V-shaped grooves decreases from one end to the other end of the corresponding base.

7. The aligning and positioning device of claim 6, wherein the depth of two adjacent sub-V-shaped grooves in the plurality of sub-V-shaped grooves differs by 0.5 mm.

8. The aligning positioner of claim 7, wherein the number of the sub-V-grooves in each V-groove is 8.

9. The aligning and positioning device of claim 8, wherein each of the sub-V-shaped grooves has a cross-sectional shape of an isosceles right triangle.

10. The aligning and positioning device of claim 9, wherein two rows of V-shaped grooves are disposed in parallel on each base.