5-axis spatial precision measuring jig

Abstract

To provide a five-axis space accuracy measurement jig that enables precise measurement and correction work of a five-axis machine tool to be quickly performed.SOLUTION: A five-axis space accuracy measurement jig includes a body and a base. The body includes a first side, a second side, and a third side. The first side is parallel to a first direction and has both ends connected to the second side and the third side, respectively, and facing each other. Angles between the first side and the second side and between the first side and the third side are 45 degrees, and an angle between the second side and the third side is 90 degrees. At least three attachment holes are provided on one surface of the body, and each are used to attach a spherical body. A center connection line of the at least three attachment holes is parallel to the first direction, and distances between centers of two adjacent attachment holes are the same. The body is installed on the base so as to be axially rotatable and installed on a work table surface of a five-axis machine tool.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to the field of machining technology, and particularly to a 5-axis spatial accuracy measuring jig that can quickly perform precise measurement and correction operations on a 5-axis machine tool.

Background Art

[0002] Based on the requirements for 5-axis high-precision machining due to the global energy conversion and aerospace industries, in order to achieve labor savings and improve the accuracy of surface machining, manufacturers have invested in the development of 5-axis machining centers, clamping the workpiece once to complete complex cutting processes, performing interpolation through spatial geometric calculations, and executing high-precision and high-quality machining of products such as turbine blades and artificial joints to achieve optimal performance requirements.

[0003] Conventional 5-axis accuracy measurement methods require the integration of expensive equipment such as laser interferometers, large straight gauges, pointer scales combined with square gauges, and circle testers. In addition to the 21 items of errors in the linear axes, they include 22 items of errors in the two rotary axes, with a total of 43 items of error measurement items. Although all measurements, accuracy correction, and adjustment are completed, the process is complicated and time-consuming.

[0004] Also, when measuring a 5-axis machine tool using a precision measuring jig, it is necessary to move the jig several times according to the differences in measurement items, which takes time and processes. Furthermore, measurement errors due to differences in the experience and methods of operators cannot be avoided.

Summary of the Invention

Problems to be Solved by the Invention

[0005] Therefore, how to develop the technology of a "5-axis spatial accuracy measuring jig" that can quickly perform precise measurement and correction operations on a 5-axis machine tool is an issue that those skilled in the art need to solve.

Means for Solving the Problems

[0006] In one embodiment, the 5-axis spatial accuracy measuring jig provided by the present invention includes a body and a base, The main body has a first side, a second side, and a third side, the first side is parallel to the first direction and has opposing ends, the second side and the third side are connected to the opposing ends of the first side, there is a first clamping angle between the first side and the second side, there is a second clamping angle between the first side and the third side, there is a third clamping angle between the second side and the third side, the first and second clamping angles are both 45 degrees, and the third clamping angle is 90 degrees, and the first surface of the main body is provided with at least three mounting holes, the center connecting lines of the at least three mounting holes are parallel to the first direction and the distance between the centers of two adjacent mounting holes is the same, The main body is mounted on the base so as to be rotatable on an axis, the axis of rotation of the main body is parallel to the third direction, and the first direction and the third direction are perpendicular to each other. [Effects of the Invention]

[0007] The 5-axis spatial accuracy measuring jig provided by the present invention enables rapid precision measurement and correction work on 5-axis machine tools. [Brief explanation of the drawing]

[0008] [Figure 1] This is an explanatory diagram of the three-dimensional structure of one embodiment of the present invention. [Figure 2] This is an explanatory diagram showing a combination of a sphere and a three-dimensional structure from a different viewing angle of the embodiment shown in Figure 1. [Figure 3] This is a front view diagram illustrating the embodiment shown in Figure 1. [Figure 4] This is an explanatory diagram showing the right-side view structure of the embodiment in Figure 1 combined with a sphere. [Figure 5] This is a structural diagram illustrating the embodiment of Figure 1, in which the main body is pivotally attached to the base. [Figure 6] This is an explanatory diagram of the structure of the workbench surface fixed to the 5-axis machine tool in the embodiment shown in Figure 1. [Figure 7]This is an explanatory diagram illustrating the application of the embodiment shown in Figure 1 to the three-axis straightness measurement of the workbench surface. [Figure 8] This is an explanatory diagram illustrating the application of the embodiment shown in Figure 1 to the measurement of the three-axis perpendicularity of the workbench surface. [Figure 9] This is an explanatory diagram illustrating the application of the three-axis positioning accuracy measurement of the workbench surface in the embodiment shown in Figure 1. [Figure 10] This is an explanatory diagram illustrating the application of the embodiment shown in Figure 1 to the measurement of the error term of the A / C2 rotation axis on the workbench surface. [Figure 11A] This is a front view diagram illustrating the combination of spheres in different embodiments. [Figure 11B] This is a front view diagram illustrating the combination of spheres in different embodiments. [Figure 11C] This is a front view diagram illustrating the combination of spheres in different embodiments. [Figure 11D] This is a front view diagram illustrating the combination of spheres in different embodiments. [Modes for carrying out the invention]

[0009] The 5-axis spatial accuracy measuring jig 100 of the present invention, shown in Figures 1 to 4, includes, for example, a main body 10 and a base 30. The material of the main body 10 is a material with a low coefficient of expansion, and may be, for example, granite.

[0010] Referring to Figures 1 to 4, the main body 10 is, for example, a triangular block having a first side 11, a second side 12, and a third side 13, but the present invention is not limited thereto. All three sides are flat surfaces.

[0011] The first side 11 is parallel to the first direction F1 and has opposing ends. The second side 12 and the third side 13 are both connected to both ends of the first side 11, respectively.

[0012] Referring to FIG. 3, it has a first clamping angle θ1 between the first side 11 and the second side 12, a second clamping angle θ2 between the first side 11 and the third side 13, and a third clamping angle θ3 between the second side 12 and the third side 13. The first clamping angle θ1 and the second clamping angle θ2 are both 45 degrees, and the third clamping angle θ3 is 90 degrees. Thereby, the main body 10 has a right-angled triangle outer shape.

[0013] Referring to FIGS. 1, 3 and 4, the main body 10 has a first surface 16. The first surface 16 is parallel to the plane formed by the first direction F1 and the second direction F2, and the first direction F1 and the second direction F2 are perpendicular to each other. The periphery of the first surface 16 is adjacent to the first side 11, the second side 12 and the third side 13, forming a right-angled triangle.

[0014] It should be noted that the adjacent portions of the first side 11 and the second side 12 of the main body 10, the adjacent portions of the first side 11 and the third side 13, and the adjacent portions of the second side 12 and the third side 13 are all chamfered. However, the design of these chamfers is not essential. For example, instead of chamfers, they can be arc angles or remain sharp angles.

[0015] Referring to FIGS. 2 and 3, three mounting holes 14 are provided on the first surface 16 of the main body 10, and each is used to mount the sphere 20. The central connection line C14 of the three mounting holes 14 is parallel to the first direction F1, and the distance D3 between the centers of any two adjacent mounting holes 14 is the same.

[0016] In this embodiment, the axes of the mounting holes 14 are all parallel to the third direction F3 and penetrate the main body 10. Each sphere 20 has a fixing stand 21, and the fixing stand 21 has a fixing hole 22. The mounting holes 14 and the fixing holes 22 may be, for example, screw holes. By passing the bolt 23 through the corresponding mounting hole 14 and fixing hole 22, the sphere 20 can be fixed to the main body 10.

[0017] The sphere 20 is a spherical lens (probe styli, touch probe) of a photoelectric sensor module applicable to the non-contact measurement of a five-axis machine tool.

[0018] Referring to FIGS. 3 and 4, each sphere 20 is parallel to the second direction F2 and extends perpendicular to the first side 11, and the distance between the center C20 of each sphere 20 and the first side 11 is the same.

[0019] In addition, the connection method between the main body 10 and the spheres 20 is not limited to the above structure, and the spheres 20 can be positioned on the main body 10, as long as the centers C20 of each sphere 20 are at the same height and the first side 11 is parallel to the first direction F1. Also, the number of spheres 20 is not limited to three, and at least three are sufficient.

[0020] Referring to FIGS. 1, 2, 4, and 5, the base 30 is substantially disc-shaped. A column 31 is provided on the upper part of the base 30, and four positioning holes 32 are provided at the bottom of the base 3. The positioning holes 32 are parallel to the second direction F2 and penetrate the base 30.

[0021] The main body 10 is pivotally attached to the column 31, and the main body 10 can be installed on the base 30 so as to be rotatable about an axis. The rotation axis C10 of the main body 10 is parallel to the third direction F3. The first direction F1, the second direction F2, and the third direction F3 are perpendicular to each other.

[0022] As shown in FIG. 5, the main body 10 rotates about the rotation axis C10, and the second side 12 or the third side 13 can be made parallel to the first direction F1. After the main body 10 rotates to the required angle, the main body 10 is fixed with an object or mechanism such as a bolt, a hook, a ratchet, etc., so as to maintain the main body 10 at the required angle and prevent it from rotating.

[0023] In addition, the connection method between the main body 10 and the base 30 is not limited to the above structure, and the main body 10 can be positioned on the base 30 so as to be rotatable about an axis, as long as the rotation axis C10 of the main body 10 is parallel to the third direction F3. The related dimensions of the main body 10, the spheres 20, and the base 30 are determined by the dimensions of the working table surface of the five-axis machine tool when actually applied.

[0024] Referring to Figures 3 and 4, for example, if the workbench surface is a circular surface with a diameter of 600 mm, the diameter D1 of the base 30 may be 300 mm, that is, the outer diameter of the base 30 may be smaller than the outer diameter of the workbench surface. Also, the length L1 of the first side 11 may be 537 mm. The distance D2 between the first side 11 and the bottom of the base 30 may be 270 mm. The distance D3 between the centers of two adjacent mounting holes 14 may be 220 mm apart, but may also be unequal. The length L2 from the first side 11 of the main body 10 to the bottom edge 15 of the main body 10 may be 233 mm, and the thickness T1 of the main body 10 may be 30 mm.

[0025] The downward projection position of the center C20 of the sphere 20 is not restricted. Figure 4 shows that the projection position P1 of the center C20 of the sphere 20 is offset from the center C30 of the base 30, but this is not limited to this. For example, the projection position P1 may fall within the center C30 of the base 30.

[0026] Referring to Figure 6, the 5-axis spatial accuracy measuring jig 100 can be detachably installed on the work surface 202 of the 5-axis machine tool 200 by passing a bolt 33 through the positioning hole 32 of the base 30 and the groove 204 of the work surface 202 of the 5-axis machine tool 200.

[0027] The workbench surface 202 is parallel to the XY plane, which is composed of mutually orthogonal X and Y axes, and the workbench surface 202 faces upward parallel to the Z axis, with the X, Y, and Z axes being perpendicular to each other.

[0028] As shown in Figure 6, since the work surface 202 is circular, the circular base 30 is installed concentrically on the work surface 202. However, it is not limited to this, and for example, the base 30 may be installed eccentrically on the work surface 202.

[0029] In the embodiment shown in Figure 6, the 5-axis machine tool 200 is a cradle-type 5-axis machine tool. However, the 5-axis machine tool to which the present invention is applicable is not limited to a cradle-type 5-axis machine tool, and the work surface 202 is not limited to a circular shape.

[0030] Referring to Figures 7 to 10, the state when the 5-axis spatial accuracy measuring jig 100 provided by the present invention is applied to the workbench surface 202 and measurements of different items are performed will be explained. The state at that time is shown in Figures 7 to 10.

[0031] Referring to Figure 7, the 5-axis spatial accuracy measuring jig 100 is installed on the workbench surface 202, which is parallel to the XZ plane formed by the X and Z axes and faces forward parallel to the Y axis. The length direction of the first side edge 11 of the main body 10 is parallel to the Z axis. By using the needle of a diameter-type 1 / 10,000 scale indicator 40A to contact the first side edge 11 and moving it parallel to the Z axis, and by using the needle of another diameter-type 1 / 10,000 scale indicator 40B to contact the first surface 16 of the main body 10 and moving it parallel to the Z axis, 3-axis straightness measurement is performed on the workbench surface 202, and error analysis and correction are performed by combining the measurement data. The present invention does not include the diameter-type 1 / 10,000 scale indicator 40A or the diameter-type 1 / 10,000 scale indicator 40B.

[0032] Referring to Figure 8, the 5-axis spatial accuracy measuring jig 100 is installed on the workbench surface 202, which is parallel to the XY plane composed of the X and Y axes and oriented upward parallel to the Z axis. The length direction of the second side 12 of the main body 10 is parallel to the X axis, and the length direction of the third side 13 of the main body 10 is parallel to the Z axis. The needle of the diameter-type 1 / 10,000 scale indicator 40A is brought into contact with the second side 12 and moved parallel to the X axis, and the needle of the diameter-type 1 / 10,000 scale indicator 40B is brought into contact with the third side 13 and moved parallel to the Z axis, thereby performing 3-axis perpendicularity measurement with respect to the workbench surface 202, and error analysis and correction are performed by combining the measurement data. The present invention does not include the diameter-type 1 / 10,000 scale indicator 40A or the diameter-type 1 / 10,000 scale indicator 40B.

[0033] Referring to Figure 9, the 5-axis spatial accuracy measuring jig 100 is installed on the workbench surface 202, which is parallel to the XZ plane composed of the X and Z axes and faces forward parallel to the Y axis. The length direction of the first side 11 of the main body 10 is parallel to the Z axis. Three-axis positioning accuracy measurement is performed on the workbench surface 202 by measuring each sphere 20 using the photoelectric measuring module 50, and error analysis and correction are performed by summarizing the measurement data. The photoelectric measuring module 50 is, for example, the sensing head of Invention Patent No. I378843 of the Republic of China. This invention does not include the photoelectric measuring module 50.

[0034] Referring to Figure 10, the 5-axis spatial accuracy measuring jig 100 is installed on the workbench surface 202, which is parallel to the XY plane composed of the X and Y axes and oriented upward parallel to the Z axis. The length direction of the first side 11 of the main body 10 is parallel to the Y axis. By measuring each sphere 20 using the photoelectric measuring module 50, the rotation axis error term of the A / C2 axis is measured relative to the workbench surface 202, and error analysis and correction are performed by summarizing the measurement data.

[0035] In the case of the cradle-type 5-axis machine tool 200, the A / C2 axes described above refer to the axis around which the work surface 202 rotates about the X axis as the A axis, and the axis around which the work surface 202 rotates about the Z axis as the C axis, as shown in Figure 10 as axes A and axis C.

[0036] Referring to Figures 11A to 11D, as mentioned above, the number of spheres 20 is not limited to three, but is at least three, and the distance between two adjacent spheres 20 may be equidistant or unequal. To achieve the above objective, equidistant or unequal mounting holes can be provided in the main body 10.

[0037] For example, as shown in Figure 11A, the main body 10 has five mounting holes 14 at equal intervals, and a sphere 20 is provided in each mounting hole 14, resulting in a total of five spheres 20, and the distance between two adjacent spheres 20 is the same.

[0038] For example, as shown in Figure 11B, the main body 10 has five mounting holes 14 at equal intervals, however, only four of these mounting holes 14 are fitted with spheres 20, resulting in a total of four spheres 20, and the distance between two adjacent spheres 20 is either the same or different.

[0039] For example, as shown in Figure 11C, the main body 10 has six mounting holes 14 that are not evenly spaced, however, spheres 20 are provided in only four of these mounting holes 14, resulting in a total of four spheres 20, and the distance between two adjacent spheres 20 is different.

[0040] For example, as shown in Figure 11D, the main body 10 has four mounting holes 14 that are not evenly spaced, however, spheres 20 are provided in only three of these mounting holes 14, resulting in a total of three spheres 20, and the distance between two adjacent spheres 20 is different.

[0041] In summary, the 5-axis spatial accuracy measuring jig provided by the present invention has a specially designed triangular structure and is mounted in a position that combines at least three spheres. It can measure at least 28 sets of data with the largest error ratio in a single positioning operation, achieving the greatest accuracy improvement effect in the shortest time. During the measurement process, it does not require movement of the jig and can share the measurement of 3-axis straightness and 2-axis angular motion. It can quickly and accurately measure the spatial geometric error of a 5-axis machine tool and use it as the basis for interpolation calculation data.

[0042] This invention, based on high-precision jigs, can measure the relative accuracy of tool machines and significantly reduce the cost required for laser equipment. Furthermore, this invention effectively improves measurement efficiency by avoiding human error through photoelectric non-contact measurement technology and a simplified process.

[0043] Although the present invention has been disclosed in the embodiments described above, this invention is not limited to the present invention, and those skilled in the art may make some modifications and alterations without departing from the spirit of the invention, and therefore the scope of protection of the present invention shall be subject to the claims described below. [Explanation of symbols]

[0044] 100 5-axis spatial precision measuring fixture 10 Main Unit 11 First side 12 Second side 13 Third side 14 mounting holes 15 Bottom edge 16 Front page 20 spheres 21 Fixed Stand 22 Fixing hole 23 volts 30 base 31 Column 32 positioning holes 33 volts 40A Diameter-type 1 / 10,000 scale indicator 40B Diameter-type 1 / 10,000 scale indicator 50 Photoelectric Measurement Module 200 5 axis machine tool 202 Workbench surface 204 Groove A-axis C-axis C10 Rotation axis C14 Center Connection Line C20 center C30 center D1 diameter D2 distance D3 Distance F1 1st direction F2 2nd direction F3 3rd direction L1 Length L2 Length P1 projection position T1 Thickness θ1 First clamping angle θ2 Second clamping angle θ3 Third clamping angle

Claims

1. Including the main unit and the base, The main body has a first side, a second side, and a third side, the first side being parallel to the first direction and having opposing ends, the second side and the third side being connected to the opposing ends of the first side including the chamfered portion if there is one, there is a first clamping angle between the first side and the second side, there is a second clamping angle between the first side and the third side, there is a third clamping angle between the second side and the third side, the first and second clamping angles are both 45 degrees, and the third clamping angle is 90 degrees, and the first surface of the main body is provided with at least three mounting holes, the center connection lines of the at least three mounting holes are parallel to the first direction and the distance between the centers of two adjacent mounting holes is the same, A five-axis spatial precision measuring jig, wherein the main body is mounted on the base so as to be rotatable on an axis, the axis of rotation of the main body is parallel to the third direction, and the first direction and the third direction are perpendicular to each other.

2. The five-axis spatial accuracy measuring jig according to claim 1, wherein the axial directions of at least three of the mounting holes are all parallel to the third direction.

3. A five-axis spatial accuracy measuring jig according to claim 1, wherein a column is provided on the upper part of the base, and the main body is pivotally attached to the column.

4. The five-axis spatial accuracy measuring jig according to claim 1, wherein a plurality of positioning holes are provided at the bottom of the base.

5. The five-axis spatial accuracy measuring jig according to claim 1, wherein the first surface is perpendicular to the plane formed by the first direction and the third direction, and the periphery of the first surface is adjacent to the first side, the second side, and the third side.

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