Geometric accuracy comprehensive detection device and method for five-axis machining center

Abstract

The application discloses a kind of five-axis linkage machining center geometric precision comprehensive detection device and detection method, detection device includes reference cube, rotating shaft installation module, fine adjustment mechanism and integrated detection unit, reference cube is the hollow square of granite or marble material, reference cube left side along symmetry center line is provided with through hole;Rotating shaft installation module includes connecting sleeve, fixed sleeve and several lock nuts, fine adjustment mechanism includes several lock nuts;Integrated detection unit includes the first level meter of same plane fixed connection on the plane of reference cube and the second level meter of same plane fixed installation in the right plane of same reference cube.The seven key geometric precision of five-axis linkage machining center can be detected by once clamping debugging, specifically including shaft guide rail flatness, three moving shaft straightness and perpendicularity between three moving shafts, which significantly improves detection efficiency and detection accuracy.

Description

Technical Field

[0001] This invention belongs to the field of geometric accuracy testing technology for five-axis linkage machining centers, and particularly relates to a comprehensive testing device and method for geometric accuracy of five-axis linkage machining centers. Background Technology

[0002] Currently, five-axis machining centers occupy an important position in modern manufacturing. They can complete multi-faceted and multi-process machining of complex-shaped workpieces in a single setup, improving machining efficiency and precision. They are widely used in high-end manufacturing fields such as aerospace, automobile manufacturing, and precision molds.

[0003] The geometric accuracy of a five-axis machining center directly affects the machining quality, but existing geometric accuracy testing technologies have the following shortcomings:

[0004] High equipment cost: Mainstream high-precision testing devices such as dual-frequency laser interferometers are based on the principle of optical interference, with equipment costs exceeding 500,000 yuan. They also require constant temperature, constant humidity and vibration-free environments, resulting in poor on-site adaptability.

[0005] Low inspection efficiency: Traditional measuring tools such as right angle rulers and levels can only measure single-axis straightness or perpendicularity between two axes. When conducting comprehensive inspection, tools need to be changed and the benchmark needs to be rebuilt multiple times. This will lead to low efficiency and cumulative errors due to benchmark fragmentation.

[0006] Low integration: The patent solution with publication number CN102506666A relies on the static reference of the worktable and does not consider the error transmission in the dynamic rotation of the A / C axes; the patent solution with publication number CN101758418A is for the calibration of gantry milling machines and does not involve the integration of five-axis rotary references. Summary of the Invention

[0007] To overcome the shortcomings of existing technologies, this invention provides a comprehensive geometric accuracy testing device and method for five-axis linkage machining centers, which can efficiently test multiple geometric accuracy parameters of five-axis linkage machining centers.

[0008] The objective of this invention is achieved through the following technical solution:

[0009] Firstly, a comprehensive geometric accuracy testing device for a five-axis linkage machining center is provided, comprising:

[0010] The reference cube is a hollow cube made of granite or marble, with a through hole on the left side along the center line of symmetry.

[0011] The rotary shaft mounting module includes a connecting sleeve, a fixing sleeve, and several locking screws. The connecting sleeve is coaxially fixedly connected to the through hole. The connecting sleeve has a tapered hole along the axis. The connecting sleeve has several first countersunk holes and several second countersunk holes alternately and evenly arranged along the circumference. The right end of the fixing sleeve is coaxially provided with a tapered shaft for seamless insertion into the tapered hole. The left end of the fixing sleeve is provided with a chuck for coaxial clamping and fixing by the A-axis clamp. The fixing sleeve has several connecting holes evenly arranged along the circumference. Several locking screws pass through several first countersunk holes from the left end and are threaded to several connecting holes respectively.

[0012] The fine-tuning mechanism includes several set screws, which are threaded from the left end to the small ends of several second countersunk holes and then evenly tighten the fixing sleeve in the circumferential direction.

[0013] An integrated detection unit includes a first level fixedly connected to the upper plane of a reference cube and a second level fixedly connected to the right plane of the reference cube. The first level includes a first level tube and a second level tube, the length direction of the first level tube being perpendicular to the axis of the through hole, and the length direction of the second level tube being parallel to the axis of the through hole. The second level includes a third level tube and a fourth level tube that are perpendicular to each other, the length direction of the third level tube being parallel to the length direction of the first level tube, and the length direction of the fourth level tube being perpendicular to the length direction of the second level tube.

[0014] Furthermore, square holes are provided on the top, bottom, front, rear, and right sides of the reference cube.

[0015] Furthermore, the perpendicularity between two adjacent sides of the reference cube is ≤0.002mm / 300mm.

[0016] Furthermore, the taper of both the conical hole and the conical shaft is 15°.

[0017] Furthermore, the connecting sleeve is uniformly provided with a number of first countersunk holes and a number of second countersunk holes along the same circumference, and the first countersunk holes and the second countersunk holes are arranged alternately.

[0018] Secondly, a comprehensive method for detecting the geometric accuracy of a five-axis linkage machining center is provided, which includes the following steps:

[0019] The fixing sleeve is coaxially clamped and fixed on the A-axis fixture by the chuck, that is, the geometric accuracy comprehensive testing device of the five-axis linkage machining center is fixedly installed on the A-axis fixture, and the reference cube is firmly installed without shaking.

[0020] Install the dial indicator on the component of the machine tool that moves with the Y and Z axes, and make the dial indicator head perpendicular to the right side of the reference cube; manually rotate the A axis one revolution, observe the pointer jump range of the dial indicator, and then adjust several set screws to fine-tune the angle of the reference cube relative to the A axis until the maximum pointer jump error of the dial indicator is ≤0.005mm when the A axis rotates one revolution.

[0021] Manually rotate the A-axis until the bubble in the first level tube is centered; move the A-axis on the X-axis guide rail and periodically read and record the bubble positions in the first and second level tubes; based on the multiple recorded bubble positions in the second level tube, fit the straightness curve of the X-axis guide rail to obtain the straightness error of the X-axis guide rail; based on the multiple recorded bubble positions in the first and second level tubes, process the data to obtain the flatness error of the X-axis guide rail; if the flatness error of the X-axis guide rail is ≤0.02 / 1000, proceed to the next step; otherwise, adjust the X-axis guide rail and repeat this step.

[0022] Place the dial indicator head perpendicularly against the X-axis parallel plane on the reference cube; move the X-axis so that the dial indicator head moves from one end of the X-axis parallel plane to the other end, and record the dial indicator reading; obtain the perpendicularity error of the X-axis to the YOZ plane based on the maximum and minimum readings of the dial indicator; obtain the straightness of the X-axis based on the starting and ending readings of the dial indicator.

[0023] Place the dial indicator head perpendicularly against the Y-axis parallel plane on the reference cube; move the Y-axis so that the dial indicator head moves from one end of the Y-axis parallel plane to the other end, and record the dial indicator reading; obtain the perpendicularity error of the Y-axis to the XOZ plane based on the maximum and minimum readings of the dial indicator; obtain the straightness of the Y-axis based on the starting and ending readings of the dial indicator.

[0024] Place the dial indicator head perpendicularly against the Z-axis parallel plane on the reference cube; move the Z-axis so that the dial indicator head moves from one end of the Z-axis parallel plane to the other end, and record the dial indicator reading; obtain the perpendicularity error of the Z-axis to the XOY plane based on the maximum and minimum readings of the dial indicator; obtain the straightness of the Z-axis based on the starting and ending readings of the dial indicator.

[0025] Furthermore, mounting the dial indicator on a component of the machine tool that moves with the Y and Z axes includes:

[0026] The magnetic base is attached to the parts of the machine tool that move with the Y and Z axes;

[0027] Install the dial indicator on the magnetic base.

[0028] Furthermore, after vertically pressing the dial indicator head against the reference cube, apply a preload of 0.3mm~0.5mm, and then zero the dial indicator.

[0029] Furthermore, the movement speed of the X-axis, Y-axis, and Z-axis is ≤10mm / s.

[0030] The beneficial effects of this invention are as follows:

[0031] This invention can detect seven key geometric accuracies of a five-axis machining center in a single setup and adjustment, specifically including the flatness of the axis guideways, the straightness of the three moving axes, and the perpendicularity between the three moving axes. Compared with traditional inspection methods, this invention eliminates the cumbersome processes of frequently changing inspection gauges and repeatedly establishing benchmarks, significantly shortening inspection time, greatly improving inspection efficiency, and effectively reducing labor costs.

[0032] This invention requires only one clamping and adjustment, effectively eliminating the reference error introduced by multiple clampings; the reference cuboid has a low coefficient of thermal expansion and excellent thermal stability, effectively suppressing measurement drift caused by environmental temperature changes; at the same time, combined with multi-point and multi-angle measurement methods, it significantly reduces the impact of environmental interference or operational errors on the results, ensuring the comprehensiveness, accuracy and repeatability of measurement data, and can meet the requirements of high-end manufacturing fields for machine tool precision testing;

[0033] In addition, compared with traditional testing methods that rely on expensive equipment such as dual-frequency laser interferometers, this testing device can significantly reduce equipment purchase costs while ensuring the same testing accuracy. Attached Figure Description

[0034] The invention will now be described in more detail with reference to embodiments and the accompanying drawings.

[0035] Figure 1 A schematic diagram of the detection device in this invention is shown;

[0036] Figure 2 An exploded view of the detection device of the present invention is shown;

[0037] Figure 3 The diagram shows the installation of the detection device of the present invention on a horizontal A-axis five-axis machine tool;

[0038] Figure 4 The diagram shows the installation of the dial indicator and magnetic base in this invention;

[0039] Figure 5 A schematic diagram of the installation of the detection device of the present invention on a cradle-type five-axis machine tool is shown;

[0040] Figure 6 The diagram shows the installation of the detection device of the present invention on a five-axis turning and milling machine tool;

[0041] In the accompanying drawings, the same parts use the same reference numerals. The drawings are not to scale.

[0042] Figure label:

[0043] 1. Reference cuboid; 101. Square hole; 2. First level; 3. Fixing sleeve; 301. Tapered shaft; 302. Connecting hole; 303. Chuck; 4. Connecting sleeve; 401. Tapered hole; 402. Second countersunk hole; 403. First countersunk hole; 5. Second level; 6. Set screw; 7. Locking screw; 8. Dial indicator; 9. Magnetic indicator base. Detailed Implementation

[0044] The invention will now be further described with reference to the accompanying drawings.

[0045] This invention provides a comprehensive geometric accuracy testing device for a five-axis linkage machining center, such as... Figure 1 and Figure 2 As shown, it includes:

[0046] Reference cube 1 is a hollow cube made of granite or marble. A through hole is provided on the left side of reference cube 1 along the center line of symmetry.

[0047] The rotating shaft mounting module includes a connecting sleeve 4, a fixing sleeve 3, and eight locking screws 7. The connecting sleeve 4 is coaxially fixed in the through hole. The connecting sleeve 4 has a tapered hole 401 along its axis. The connecting sleeve 4 has eight first countersunk holes 403 and eight second countersunk holes 402 evenly arranged along its circumference. The eight first countersunk holes 403 and eight second countersunk holes 402 are staggered. The right end of the fixing sleeve 3 is coaxially provided with a tapered shaft 301 for seamless insertion into the tapered hole 401. The left end of the fixing sleeve 3 is provided with a chuck 303 for coaxial clamping and fixing by the A-axis clamp. The fixing sleeve 3 has eight connecting holes 302 evenly arranged along its circumference. The eight locking screws 7 pass through the eight first countersunk holes 403 from the left end and are threaded into the eight connecting holes 302 respectively.

[0048] The fine-tuning mechanism includes eight set screws 6. After the eight set screws 6 are threaded to the small ends of the eight second countersunk holes 402 from the left end, they evenly tighten the fixing sleeve 3 in the circumferential direction.

[0049] The integrated detection unit includes a first level 2 fixedly connected to the upper plane of the reference cube 1 in the same plane, and a second level 5 fixedly connected to the right plane of the reference cube 1 in the same plane. The first level 2 includes a first level tube and a second level tube. The length direction of the first level tube is perpendicular to the axis of the through hole, and the length direction of the second level tube is parallel to the axis of the through hole. The second level 5 includes a third level tube and a fourth level tube that are perpendicular to each other. The length direction of the third level tube is parallel to the length direction of the first level tube, and the length direction of the fourth level tube is perpendicular to the length direction of the second level tube.

[0050] The length, width, and height of the reference cube 1 are all 300mm, and the coefficient of thermal expansion of the reference cube 1 is no greater than 4.5×10. -6 / ℃, the edge of the reference cube 1 is rounded with a radius R and R is not less than 3mm; the chuck 303 is a block chuck, and the length and width of the cross section of the chuck 303 are 75mm and 40mm respectively.

[0051] It should also be noted that several set screws 6 lift the fixing sleeve 3 by varying screw depths, so that the reference cube 1 undergoes elastic deformation; in addition, both the set screws 6 and the locking screws 7 are internal hexagon screws.

[0052] It should also be noted that the integrated inspection unit is applicable to various CNC machine tools. For example, in AB mode and mill-turn composite five-axis machine tools, the first level 2 is used to inspect the flatness of the axis guideways; in cradle-type five-axis machine tools, the second level 5 is used to inspect the flatness of the axis guideways.

[0053] In one embodiment, square holes 101 are provided on the upper, lower, front, rear, and right sides of the reference cube 1 to reduce the weight of the reference cube 1; wherein, the length and width of the cross-section of the square holes 101 on the upper, lower, front, and rear sides of the reference cube 1 are all 170mm; the length and width of the cross-section of the square hole 101 on the right side of the reference cube 1 are both 220mm; in addition, these square holes 101 are respectively provided in the center on each side of the reference cube 1.

[0054] The perpendicularity of two adjacent sides on the reference cube 1 is ≤0.002mm / 300mm.

[0055] In one embodiment, the taper of both the tapered hole 401 and the tapered shaft 301 is 15°.

[0056] In one embodiment, the connecting sleeve 4 is uniformly provided with eight first countersunk holes 403 and eight second countersunk holes 402 along the same circumference, and a second countersunk hole 402 is provided between two adjacent first countersunk holes 403.

[0057] This invention provides a comprehensive method for detecting the geometric accuracy of a five-axis linkage machining center, such as... Figure 1-4As shown, it is based on a horizontal A-axis five-axis machine tool, a five-axis linkage machining center, and specifically includes the following steps:

[0058] Step S1: Fix the fixed sleeve 3 to the A-axis fixture by coaxially clamping it with the chuck 303, that is, fix the five-axis linkage machining center geometric accuracy comprehensive testing device to the A-axis fixture;

[0059] Step S2: Install dial indicator 8 on the component of the machine tool that moves with the Y and Z axes, and make the head of dial indicator 8 perpendicular to the right side of the reference cube 1; manually and slowly rotate the A axis one revolution, observe the pointer jump range of dial indicator 8, and then adjust the eight set screws 6 to adjust the angle of the reference cube 1 relative to the A axis until the maximum jump error of the pointer of dial indicator 8 is no more than 0.005mm when the A axis rotates one revolution.

[0060] Step S3: Manually and slowly rotate the A-axis until the bubble in the first level tube is centered, so that the upper surface of the reference cube 1 is in a horizontal reference state; move the A-axis on the X-axis guide rail, take a measurement point every 200mm~500mm, and read and record the bubble values ​​in the first and second level tubes at each measurement point; based on the multiple recorded bubble values ​​in the second level tube, fit the straightness curve of the X-axis guide rail to obtain the straightness error of the X-axis guide rail; based on the multiple recorded bubble values ​​in the first and second level tubes, use the minimum area method to process the data to obtain the flatness error of the X-axis guide rail; if the flatness error of the X-axis guide rail is ≤0.02 / 1000, then proceed to step S4; otherwise, adjust the X-axis guide rail and proceed to step S3 again.

[0061] Step S4: Place the dial indicator 8 perpendicularly against the X-axis parallel plane on the reference cube 1; manually or automatically move the X-axis so that the dial indicator 8 moves from one end of the X-axis parallel plane to the other end, specifically moving it at a constant speed of 300mm along the X-axis parallel plane, and record the reading of the dial indicator 8; based on the maximum and minimum readings of the dial indicator 8, obtain the perpendicularity error of the X-axis to the YOZ plane; based on the starting and ending readings of the dial indicator 8, obtain the straightness of the X-axis;

[0062] Step S5: Place the dial indicator 8 perpendicularly against the Y-axis parallel plane on the reference cube 1; manually or automatically move the Y-axis so that the dial indicator 8 moves from one end of the Y-axis parallel plane to the other end, specifically moving it at a constant speed of 300mm along the Y-axis parallel plane, and record the reading of the dial indicator 8; based on the maximum and minimum readings of the dial indicator 8, obtain the perpendicularity error of the Y-axis to the XOZ plane (unit: mm / 300mm); based on the starting and ending readings of the dial indicator 8, obtain the straightness of the Y-axis;

[0063] Step S6: Place the dial indicator 8 perpendicularly against the Z-axis parallel plane on the reference cube 1; manually or automatically move the Z-axis so that the dial indicator 8 moves from one end of the Z-axis parallel plane to the other end, specifically moving at a constant speed of 300mm along the Z-axis parallel plane, and record the reading of the dial indicator 8; obtain the perpendicularity error of the Z-axis to the XOY plane based on the maximum and minimum readings of the dial indicator 8; obtain the straightness of the Z-axis based on the starting and ending readings of the dial indicator 8.

[0064] It should be noted that when the maximum runout error of the dial indicator 8 is no more than 0.005mm when the A-axis rotates one revolution, the YOZ measurement reference plane of the reference cube 1 is perpendicular to the A-axis axis to establish a stable reference for subsequent measurements.

[0065] It should also be noted that if the flatness error of the X-axis guide rail is no greater than 0.02 / 1000, it means that the test result meets the accuracy requirements and subsequent processes can be carried out; otherwise, the X-axis guide rail needs to be adjusted to a qualified state first.

[0066] It should also be noted that when any one of the X, Y, or Z axes is moved, the other two axes remain fixed.

[0067] It should also be noted that the perpendicularity error = |maximum reading - minimum reading|, and the straightness error = |starting point reading - ending point reading|.

[0068] In one embodiment, mounting the dial indicator 8 on a component of a machine tool that moves along the Y-axis and Z-axis includes:

[0069] The magnetic base 9 is attached to the parts of the machine tool that move with the Y and Z axes;

[0070] Install the dial indicator 8 on the magnetic base 9.

[0071] In one embodiment, after the dial indicator 8 is vertically pressed against the reference cube 1, a preload of 0.3mm~0.5mm is applied before zeroing.

[0072] Understandably, this setup ensures that the dial indicator 8's head is in full contact with the measured surface of the reference cube 1.

[0073] In one embodiment, the moving speed of the X-axis, Y-axis, and Z-axis is no greater than 10 mm / s.

[0074] Understandably, this setting avoids reading distortion caused by impact or vibration.

[0075] It should be noted that, to ensure the stability of the reference, after the reference is established in step S3, the set screw 6 should not be adjusted again in subsequent steps; the same five-axis linkage machining center needs to be tested three times, and the data dispersion should be ≤0.001mm.

[0076] In addition, the five-axis linkage machining center geometric accuracy comprehensive testing device can also be used for Figure 5 The cradle-type five-axis machine tool shown and Figure 6 The five-axis machining center shown, such as the milling-turning composite five-axis machine tool, uses a second level 5 to check the flatness of the axis guide rails in the cradle-type five-axis machine tool, and a first level 2 to check the flatness of the axis guide rails in the milling-turning composite five-axis machine tool.

[0077] Based on the above, the present invention has the following advantages:

[0078] This invention can detect seven key geometric accuracies of a five-axis machining center in a single setup and adjustment, specifically including the flatness of the axis guideways, the straightness of the three moving axes, and the perpendicularity between the three moving axes. Compared with traditional inspection methods, this invention eliminates the cumbersome processes of frequently changing inspection gauges and repeatedly establishing benchmarks, significantly shortening inspection time, greatly improving inspection efficiency, and effectively reducing labor costs.

[0079] This invention effectively eliminates the reference error introduced by multiple clamping through a single clamping and debugging; moreover, the reference cube 1 has a low coefficient of thermal expansion and excellent thermal stability, effectively suppressing measurement drift caused by environmental temperature changes; at the same time, combined with a multi-point and multi-angle measurement method, it significantly reduces the impact of environmental interference or operational errors on the results, ensuring the comprehensiveness, accuracy and repeatability of the measurement data, and can fully meet the stringent testing requirements for machine tool precision in the high-end manufacturing field;

[0080] In this invention, the structural design conforms to ergonomics, and the testing process is clear and the steps are well-defined. Operators do not need to have advanced professional testing knowledge or complex operating skills to quickly master and complete high-precision testing tasks. At the same time, the modular design further improves the maintainability and upgradeability of the testing device and reduces the maintenance costs for long-term use.

[0081] Compared to traditional testing solutions that rely on expensive equipment such as dual-frequency laser interferometers, this testing device can significantly reduce equipment purchase costs, testing time, and manpower requirements while ensuring the same testing accuracy, and also eliminates the need for dedicated equipment maintenance. Its highly integrated features further reduce the overall testing costs for enterprises and improve production efficiency.

[0082] In the description of this invention, it should be understood that the terms "upper", "lower", "bottom", "top", "front", "rear", "inner", "outer", "left", "right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0083] While the invention has been described herein with reference to specific embodiments, it should be understood that these embodiments are merely examples of the principles and applications of the invention. Therefore, it should be understood that many modifications can be made to the exemplary embodiments, and other arrangements can be designed without departing from the spirit and scope of the invention as defined by the appended claims. It should be understood that different dependent claims and features described herein can be combined in ways different from those described in the original claims. The combination of different dependent claims and features described herein is not limited to the forms described in the original claims. It is also understood that features described in conjunction with individual embodiments can be used in other described embodiments.

Claims

1. A comprehensive geometric accuracy testing device for a five-axis linkage machining center, characterized in that, include: A reference cube (1) is a hollow cube made of granite or marble. A through hole is provided on the left side of the reference cube (1) along the center line of symmetry. A rotating shaft mounting module includes a connecting sleeve (4), a fixing sleeve (3), and several locking screws (7). The connecting sleeve (4) is coaxially fixedly connected to the through hole. The connecting sleeve (4) is provided with a tapered hole (401) along the axis. The connecting sleeve (4) is provided with several first countersunk holes (403) evenly in the circumferential direction, and several second countersunk holes (402) are provided evenly in the circumferential direction. The several first countersunk holes (403) and several second countersunk holes (402) are staggered. The right end of the fixing sleeve (3) is coaxially provided with a tapered shaft (301) for seamless insertion into the tapered hole (401). The left end of the fixing sleeve (3) is provided with a chuck (303) for coaxial clamping and fixing by the A-axis clamp. The fixing sleeve (3) is provided with several connecting holes (302) evenly in the circumferential direction. Several locking screws (7) pass through several first countersunk holes (403) from the left end and are threaded to several connecting holes (302). The fine-tuning mechanism includes a plurality of set screws (6), which are threaded from the left end to the small ends of a plurality of second countersunk holes (402) and then uniformly tighten the fixing sleeve (3) in the circumferential direction. An integrated detection unit includes a first level (2) fixedly connected to the upper plane of the reference cube (1) in the same plane and a second level (5) fixedly connected to the right plane of the reference cube (1) in the same plane. The first level (2) includes a first level tube and a second level tube. The length direction of the first level tube is perpendicular to the axis of the through hole, and the length direction of the second level tube is parallel to the axis of the through hole. The second level (5) includes a third level tube and a fourth level tube that are perpendicular to each other. The length direction of the third level tube is parallel to the length direction of the first level tube, and the length direction of the fourth level tube is perpendicular to the length direction of the second level tube.

2. The comprehensive geometric accuracy testing device for a five-axis linkage machining center according to claim 1, characterized in that, The reference cube (1) is provided with square holes (101) on its upper, lower, front, rear and right sides.

3. The comprehensive geometric accuracy testing device for a five-axis linkage machining center according to claim 1, characterized in that, The perpendicularity of two adjacent sides of the reference cube (1) is ≤0.002mm / 300mm.

4. The comprehensive geometric accuracy testing device for a five-axis linkage machining center according to claim 1, characterized in that, The taper of both the conical hole (401) and the conical shaft (301) is 15°.

5. The comprehensive geometric accuracy testing device for a five-axis linkage machining center according to claim 1, characterized in that, The connecting sleeve (4) is uniformly provided with a plurality of first countersunk holes (403) and a plurality of second countersunk holes (402) along the same circumference, and the first countersunk holes and the second countersunk holes are arranged alternately.

6. A comprehensive method for detecting the geometric accuracy of a five-axis linkage machining center, characterized in that, Includes the following steps: The fixing sleeve (3) is coaxially clamped and fixed on the A-axis fixture by the chuck (303), that is, the five-axis linkage machining center geometric accuracy comprehensive testing device according to any one of claims 1-5 is fixedly installed on the A-axis fixture; Install the dial indicator (8) on the part of the machine tool that moves with the Y-axis and Z-axis, and make the head of the dial indicator (8) perpendicular to the right side of the reference cube (1); manually rotate the A-axis one revolution, observe the pointer jump range of the dial indicator (8), and then adjust several set screws (6) to adjust the angle of the reference cube (1) relative to the A-axis until the maximum jump error of the pointer of the dial indicator (8) is no greater than 0.005mm when the A-axis rotates one revolution; Manually rotate the A-axis until the bubble in the first level tube is centered; move the A-axis on the X-axis guide rail and periodically read and record the bubble positions in the first and second level tubes; based on the multiple recorded bubble positions in the second level tube, fit the straightness curve of the X-axis guide rail to obtain the straightness error of the X-axis guide rail; based on the multiple recorded bubble positions in the first and second level tubes, process the data to obtain the flatness error of the X-axis guide rail; if the flatness error of the X-axis guide rail is ≤0.02 / 1000, proceed to the next step; otherwise, adjust the X-axis guide rail and repeat this step. Place the dial indicator (8) vertically against the X-axis parallel plane on the reference cube (1); move the X-axis so that the dial indicator (8) moves from one end of the X-axis parallel plane to the other end, and record the reading of the dial indicator (8); obtain the perpendicularity error of the X-axis to the YOZ plane based on the maximum and minimum readings of the dial indicator (8); obtain the straightness of the X-axis based on the starting and ending readings of the dial indicator (8). Place the dial indicator (8) vertically against the plane parallel to the Y-axis on the reference cube (1); move the Y-axis so that the dial indicator (8) moves from one end of the plane parallel to the Y-axis to the other end, and record the reading of the dial indicator (8); obtain the perpendicularity error of the Y-axis to the XOZ plane based on the maximum and minimum readings of the dial indicator (8); obtain the straightness of the Y-axis based on the starting and ending readings of the dial indicator (8). Place the dial indicator (8) vertically against the Z-axis parallel plane on the reference cube (1); move the Z-axis so that the dial indicator (8) moves from one end of the Z-axis parallel plane to the other end, and record the reading of the dial indicator (8); obtain the perpendicularity error of the Z-axis to the XOY plane based on the maximum and minimum readings of the dial indicator (8); obtain the straightness of the Z-axis based on the starting and ending readings of the dial indicator (8).

7. The detection method according to claim 6, characterized in that, The method of mounting the dial indicator (8) on a component of the machine tool that moves with the Y-axis and Z-axis includes: The magnetic base (9) is attached to the parts of the machine tool that move with the Y and Z axes; Install the dial indicator (8) on the magnetic base (9).

8. The detection method according to claim 6, characterized in that, After placing the dial indicator (8) vertically against the reference cube (1), apply a preload of 0.3mm to 0.5mm, and then zero the dial indicator.

9. The detection method according to claim 6, characterized in that, The movement speed of the X-axis, Y-axis, and Z-axis is ≤10mm / s.

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