Five-axis space accuracy measurement 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 more particularly to a five-axis spatial accuracy measuring jig that can quickly perform precision measurement and correction work on a five-axis machine tool. [Background technology]

[0002] In response to the global energy transition and the aerospace industry's demand for 5-axis high-precision machining, in order to reduce manpower and improve the precision of curved surface machining, manufacturers are investing in the development of 5-axis machining centers, which can clamp the workpiece in one go to complete the complex cutting process and perform interpolation through spatial geometric operations to achieve high-precision and high-quality machining of products such as turbine blades and artificial joints, thereby achieving optimal performance requirements.

[0003] The conventional 5-axis accuracy measurement method requires the integration of expensive equipment such as a laser interferometer, a large straight gauge, a pointer scale combined with a square gauge, and a circle tester. It has 21 error items for the linear axis and 22 error items for the two rotary axes, for a total of 43 error measurement items, and completes all measurements, accuracy correction, and adjustment, but the process is complicated and time-consuming.

[0004] In addition, when using a precision measuring jig to measure a 5-axis machine tool, the jig must be moved multiple times depending on the measurement item, which takes time and effort. Furthermore, measurement errors due to differences in operator experience and methods are unavoidable. Summary of the Invention [Problem to be solved by the invention]

[0005] Therefore, the problem that must be solved by those skilled in the art is how to develop the technology of a "5-axis spatial accuracy measuring jig" that can quickly perform precision measurement and correction work on 5-axis machine tools. [Means for solving the problem]

[0006] In one embodiment, the present invention provides a five-axis spatial accuracy measurement jig, including a main body and a base; the main body has a first side, a second side, and a third side, the first side is parallel to a first direction and has opposite ends, the second side and the third side are respectively connected to the opposite ends of the first side, a first angle is formed between the first side and the second side, a second angle is formed between the first side and the third side, and a third angle is formed between the second side and the third side, the first angle and the second angle are both 45 degrees and the third angle is 90 degrees, at least three mounting holes are provided on a first surface of the main body, central connecting lines of the at least three mounting holes are parallel to the first direction, and the distances between the centers of two adjacent mounting holes are the same, The body is rotatably mounted on the base, and the rotation axis of the body is parallel to a third direction, and the first direction and the third direction are perpendicular to each other. [Effects of the Invention]

[0007] The five-axis spatial accuracy measuring jig provided by the present invention can quickly perform precision measurement and correction work on five-axis machine tools. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 1 is an explanatory diagram of a three-dimensional structure of one embodiment of the present invention. [Figure 2] 1. FIG. 4 is an explanatory diagram illustrating a combination of a sphere with a three-dimensional structure of the embodiment of FIG. 1 at a different viewing angle. [Figure 3] FIG. 2 is an explanatory front view of the embodiment of FIG. 1. [Figure 4] 2 is an explanatory diagram illustrating a right side view of the embodiment of FIG. 1 in which a sphere is combined with the structure. [Figure 5] 2 is a structural explanatory diagram of the embodiment of FIG. 1 in which the main body is pivotally attached to the base. [Figure 6] FIG. 2 is a structural explanatory diagram of a work table surface fixed to the five-axis machine tool of the embodiment shown in FIG. 1. [Figure 7]FIG. 2 is an explanatory diagram illustrating the embodiment of FIG. 1 applied to measurement of three-axis straightness of a work table surface. [Figure 8] FIG. 2 is an explanatory diagram illustrating the embodiment of FIG. 1 applied to measurement of three-axis perpendicularity of a work table surface. [Figure 9] FIG. 2 is an explanatory diagram illustrating the embodiment of FIG. 1 applied to measurement of three-axis positioning accuracy of a work table surface. [Figure 10] FIG. 2 is an explanatory diagram illustrating the embodiment of FIG. 1 applied to measurement of the error term of the A / C2 rotation axis of the work table surface. [Figure 11A] FIG. 10 is a front view illustrating a structure in which a sphere is combined with a different embodiment. [Figure 11B] FIG. 10 is a front view illustrating a structure in which a sphere is combined with a different embodiment. [Figure 11C] FIG. 10 is a front view illustrating a structure in which a sphere is combined with a different embodiment. [Figure 11D] FIG. 10 is a front view illustrating a structure in which a sphere is combined with a different embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0009] 1 to 4 includes, for example, a main body 10 and a base 30. The main body 10 is made of a material with a low expansion coefficient, such as granite.

[0010] 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 opposite ends. The second side 12 and the third side 13 are connected to both ends of the first side 11, respectively.

[0012] 3, a first included angle θ1 is formed between the first side edge 11 and the second side edge 12. A second included angle θ2 is formed between the first side edge 11 and the third side edge 13. A third included angle θ3 is formed between the second side edge 12 and the third side edge 13. The first included angle θ1 and the second included angle θ2 are both 45 degrees, and the third included angle θ3 is 90 degrees. This gives the main body 10 the outer shape of a right triangle.

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

[0014] Although the adjacent portions of the first side edge 11 and the second side edge 12 of the main body 10, the adjacent portions of the first side edge 11 and the third side edge 13, and the adjacent portions of the second side edge 12 and the third side edge 13 are all chamfered, the design of these chamfers is not essential, and for example, they may be made into arc angles instead of chamfered, or may remain sharp corners.

[0015] 2 and 3, three mounting holes 14 are provided on the first surface 16 of the main body 10, each used to mount a sphere 20. The center connecting lines C14 of the three mounting holes 14 are 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 pass through the main body 10. Each sphere 20 has a fixing stand 21, which has a fixing hole 22. The mounting holes 14 and the fixing holes 22 may be, for example, screw holes. The spheres 20 can be fixed to the main body 10 by passing bolts 23 through the corresponding mounting holes 14 and fixing holes 22.

[0017] The sphere 20 is a spherical lens (probe style, touch probe) of a photoelectric sensor module that can be applied to photoelectric non-contact measurement of a five-axis machine tool.

[0018] 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] The method of connection between the main body 10 and the spheres 20 is not limited to the above structure, and it is sufficient that the spheres 20 can be positioned on the main body 10, the centers C20 of the spheres 20 are at the same height, and the first side edges 11 are parallel to the first direction F1. The number of spheres 20 is not limited to three, and it is sufficient that there be at least three.

[0020] Referring to Figures 1, 2, 4 and 5, the base 30 is approximately disk-shaped, and a pillar 31 is provided on the top of the base 30, and four positioning holes 32 are provided on the bottom of the base 30, and the positioning holes 32 are parallel to the second direction F2 and pass through the base 30.

[0021] The main body 10 is pivotally mounted on the pillar 31, allowing the main body 10 to be rotatably mounted on the base 30. 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] 5, the main body 10 can be rotated around the rotation axis C10 to make the second side 12 or the third side 13 parallel to the first direction F1. After the main body 10 has rotated to the required angle, the main body 10 can be fixed with an object or mechanism such as a bolt, hook, or ratchet to maintain the main body 10 at the required angle and prevent it from rotating.

[0023] 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 rotatably positioned on the base 30 as long as the rotation axis C10 of the main body 10 is parallel to the third direction F3. The relative dimensions of the main body 10, sphere 20, and base 30 are determined by the dimensions of the work table surface of the five-axis machine tool in actual application.

[0024] 3 and 4, for example, if the work surface is a circular surface with a diameter of 600 mm, the diameter D1 of the base 30 may be 300 mm, i.e., the outer diameter of the base 30 may be smaller than the outer diameter of the work surface. Furthermore, the length L1 of the first side edge 11 may be 537 mm. The distance D2 between the first side edge 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, which may be evenly spaced, but may also be unevenly spaced. The length L2 from the first side edge 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 limited, and although 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, this is not limited thereto, and for example, the projection position P1 may be within the center C30 of the base 30.

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

[0027] The work table surface 202 is parallel to an XY plane formed by the X-axis and Y-axis which are orthogonal to each other, the work table surface 202 faces upward parallel to the Z-axis, and the X-axis, Y-axis and Z-axis are perpendicular to each other.

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

[0029] 6, the five-axis machine tool 200 is a cradle-type five-axis machine tool. However, the five-axis machine tool to which the present invention is applicable is not limited to a cradle-type five-axis machine tool, and the work table surface 202 is not limited to a circular shape.

[0030] 7 to 10, the following describes the state when the five-axis spatial accuracy measuring jig 100 provided by the present invention is applied to the work table surface 202 and different items are measured. The state when this is done is shown in Figures 7 to 10.

[0031] Referring to FIG. 7 , the five-axis spatial accuracy measuring jig 100 is installed on a work 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. The needle of a diameter-type 1 / 10000 scale indicator 40A is used to abut against the first side edge 11 and move parallel to the Z axis, and the needle of another diameter-type 1 / 10000 scale indicator 40B is used to abut against the first surface 16 of the main body 10 and move parallel to the Z axis, thereby performing three-axis straightness measurement on the work surface 202, and the measurement data is combined for error analysis and correction. The present invention does not include the diameter-type 1 / 10000 scale indicator 40A or the diameter-type 1 / 10000 scale indicator 40B.

[0032] Referring to FIG. 8 , the five-axis spatial accuracy measuring jig 100 is installed on a work surface 202, which is parallel to the XY plane defined by the X and Y axes and faces upward parallel to the Z axis. The length direction of the second side edge 12 of the main body 10 is parallel to the X axis, and the length direction of the third side edge 13 of the main body 10 is parallel to the Z axis. The needle of the diameter-type 1 / 10000 scale indicator 40A is abutted against the second side edge 12 and moved parallel to the X axis, and the needle of the diameter-type 1 / 10000 scale indicator 40B is abutted against the third side edge 13 and moved parallel to the Z axis, thereby performing three-axis perpendicularity measurement with respect to the work surface 202, and the measurement data is combined for error analysis and correction. The present invention does not include the diameter-type 1 / 10000 scale indicator 40A or the diameter-type 1 / 10000 scale indicator 40B.

[0033] Referring to FIG. 9 , the five-axis spatial accuracy measuring jig 100 is installed on a work surface 202, which is parallel to an XZ plane defined 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 body 10 is parallel to the Z axis. A photoelectric measurement module 50 is used to measure each sphere 20 to perform three-axis positioning accuracy measurement on the work surface 202, and the measurement data is combined for error analysis and correction. The photoelectric measurement module 50 is, for example, the sensing head disclosed in Republic of China Invention Patent No. I378843. The present invention does not include the photoelectric measurement module 50.

[0034] 10, the 5-axis spatial accuracy measuring jig 100 is installed on a worktable surface 202, which is parallel to the XY plane defined by the X and Y axes and faces upward parallel to the Z axis. The length direction of the first side edge 11 of the body 10 is parallel to the Y axis. The photoelectric measurement module 50 is used to measure each sphere 20 to measure the rotation axis error terms of the A / C two axes on the worktable surface 202, and the measurement data is combined to perform error analysis and correction.

[0035] In the case of a cradle-type five-axis machine tool 200, the axis around which the work table surface 202 rotates about the X axis is called the A axis, and the axis around which the work table surface 202 rotates about the Z axis is called the C axis, as shown in Figure 10 as the A and C axes.

[0036] 11A to 11D, as described 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 purpose, corresponding mounting holes may be provided on the main body 10 at equidistant or unequal distances.

[0037] For example, as shown in FIG. 11A, the main body 10 has five mounting holes 14 spaced at equal intervals, each of which has a sphere 20 provided therein, for a total of five spheres 20, with the distance between any two adjacent spheres 20 being the same.

[0038] For example, as shown in FIG. 11B, the main body 10 has five mounting holes 14 spaced at equal intervals, but only four of the mounting holes 14 have spheres 20 provided therein, for a total of four spheres 20, and the distance between two adjacent spheres 20 may be the same or different.

[0039] For example, as shown in FIG. 11C, the main body 10 has six mounting holes 14 arranged at uneven intervals, but only four of the mounting holes 14 have spheres 20 provided therein, for a total of four spheres 20, and the distance between two adjacent spheres 20 is different.

[0040] For example, as shown in FIG. 11D, the main body 10 has four mounting holes 14 arranged at uneven intervals, but only three of the mounting holes 14 have spheres 20 provided therein, for a total of three spheres 20, with the distance between two adjacent spheres 20 being different.

[0041] In summary, the five-axis spatial accuracy measuring fixture provided by the present invention has a specially designed triangular structure and is mounted at a position where at least three spheres are combined. It can measure at least 28 sets of data with the largest error rate in a single positioning, achieving the greatest accuracy improvement effect in the shortest time. During the measurement process, there is no need to move the fixture, and it can measure the straightness of three axes and the angular movement of two axes at the same time, allowing it to quickly and accurately measure the spatial geometric error of five-axis machine tools and serve as the basis for interpolation calculation data.

[0042] The present invention is based on high-precision fixtures, measures the relative accuracy of tool machines, and can greatly reduce the cost of laser equipment. In addition, the present invention uses photoelectric non-contact measurement technology and simplified processes to avoid artificial measurement errors and effectively improve measurement efficiency.

[0043] Although the present invention has been disclosed in the above embodiments, it is not intended to limit the present invention, and those skilled in the art can make some changes and modifications within the scope of the present invention without departing from the spirit of the present invention. Therefore, the protection scope of the present invention shall be as defined in the claims below. [Explanation of symbols]

[0044] 100 5-axis spatial accuracy measuring jig 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 hole 33 volts 40A diameter type 1 / 1000 scale indicator 40B Diameter Type 1 / 10,000 Scale Indicator 50 Photoelectric Measurement Module 200 5 axis machine tool 202 Work surface 204 Groove A-axis C-axis C10 Rotating 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 angle θ2 Second angle θ3 Third angle

Claims

1. 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 a first direction and has opposite ends, the second side and the third side are respectively connected to the opposite ends of the first side, a first angle is formed between the first side and the second side, a second angle is formed between the first side and the third side, and a third angle is formed between the second side and the third side, the first angle and the second angle are both 45 degrees and the third angle is 90 degrees, at least three mounting holes are provided on a first surface of the main body, central connecting lines of the at least three mounting holes are parallel to the first direction, and the distances between the centers of two adjacent mounting holes are the same, The main body is rotatably mounted on the base, the rotation axis of the main body is parallel to a third direction, and the first direction and the third direction are perpendicular to each other.

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

3. 2. The five-axis spatial accuracy measuring jig according to claim 1, wherein a pillar is provided on an upper portion of the base, and the main body is pivotally mounted to the pillar.

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

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

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