Experimental device and experimental method for dynamic positioning error measurement of machine tool workbench under action of three-dimensional cutting force

Abstract

The invention discloses an experimental device and an experimental method for dynamic positioning error measurement of a machine tool workbench under the action of three-dimensional cutting force, the device comprises a rack and a workbench mounted on the rack, the rack is also provided with an X-direction moving mechanism and a Y-direction moving mechanism, the workbench is provided with a load seat, and the X-direction moving mechanism and the Y-direction moving mechanism are arranged on the rack. A load is placed on the load seat so as to simulate the cutting force borne by the workbench in the vertical direction; a fixed pulley is transversely and rotatably mounted on the rack, one end of the flexible rope is fixed on the load seat, and a mass block is hung at the other end of the flexible rope after the other end of the flexible rope bypasses the fixed pulley. The ingenious design of the fixed pulley and the whole set of experiment device can simulate the three-dimensional space cutting force borne by the machine tool in a real environment, direct measurement of the dynamic positioning error of the workbench when the machine tool bears the three-dimensional cutting force is achieved, the positioning precision of the workbench is improved, and the machining precision is further improved.

Description

Technical Field

[0001] The invention relates to the technical field of numerically controlled machine tools, and in particular to an experimental device and an experimental method for measuring the dynamic positioning error of a machine tool worktable under the action of a three-dimensional cutting force. Background Art

[0002] When CNC machine tools work under complex working conditions, they will be affected by the cutting force components and will produce cutting force errors. In addition, there are geometric errors in the manufacturing and assembly process of machine tools. To compensate for these errors, separate measurements and superposition processing are usually required. However, this processing method makes it difficult to establish a direct correspondence between force and machine tool positioning error in comprehensive error measurement. The error caused by cutting force is manifested as an error under the force state of the machine tool. In order to achieve direct measurement of the dynamic positioning error of the worktable, the machine tool needs to be subjected to a certain load. Under the complex working conditions of CNC machine tools, the core goal of the dynamic positioning error model of the CNC worktable under the comprehensive influence of multiple factors is to establish a mapping relationship between factors such as cutting force size, movement speed and position and the worktable positioning error. Since the spatial load on the machine tool is complex, it is necessary to design a set of experimental devices and experimental methods for measuring the dynamic positioning error of the machine tool worktable under the action of three-dimensional cutting force, which can realize the direct measurement of the multi-factor dynamic positioning error of the machine tool XY worktable under the action of cutting force. Further improve the positioning accuracy and processing accuracy of the worktable. Summary of the invention

[0003] In order to solve the technical problems existing in the background technology, the present invention proposes an experimental device and an experimental method for measuring the dynamic positioning error of a machine tool worktable under the action of three-dimensional cutting force.

[0004] The present invention proposes an experimental device for measuring the dynamic positioning error of a machine tool worktable under the action of a three-dimensional cutting force, comprising a frame and a worktable mounted on the frame, wherein the frame is further provided with an X-direction moving mechanism and a Y-direction moving mechanism, wherein the X-direction moving mechanism is used to drive the worktable to move along the X direction, and the Y-direction moving mechanism is used to drive the worktable to move along the Y direction, and the worktable is provided with a load seat, on which a load is placed to simulate the cutting force on the worktable in the vertical direction;

[0005] The frame is provided with a fixed pulley for transverse rotation, and further comprises a flexible rope, one end of the flexible rope is fixed on the load seat, and the other end of the flexible rope is hung with a mass block after passing through the fixed pulley, the height of the mass block is lower than the height of the workbench, the mass block simulates the cutting force of the load seat in the X direction and / or the cutting force in the Y direction by stretching the load seat through the fixed pulley and the flexible rope, and the decomposition of the gravity of the mass block in the X direction and the Y direction is the cutting force of the load seat in the X direction and the cutting force in the Y direction;

[0006] The frame is provided with a laser interferometer for detecting the displacement of the workbench;

[0007] It also includes a host computer, and the laser interferometer is connected to the host computer and transmits the displacement of the workbench detected by the laser interferometer to the host computer.

[0008] Preferably, the X-axis moving mechanism is a ball screw transmission mechanism and / or the Y-axis moving mechanism is a ball screw transmission mechanism.

[0009] Preferably, the fixed pulley includes an X-direction fixed pulley and a Y-direction fixed pulley, the flexible rope includes an X-direction flexible rope and a Y-direction flexible rope, one end of the X-direction flexible rope is fixed to the load seat, and the other end of the X-direction flexible rope is passed around the X-direction fixed pulley and then suspended with an X-direction mass block; one end of the Y-direction flexible rope is fixed to the load seat, and the other end of the Y-direction flexible rope is passed around the Y-direction fixed pulley and then suspended with a Y-direction mass block.

[0010] Preferably, it also includes an X-direction bracket and a Y-direction bracket installed on the frame, the X-direction fixed pulley is installed on the X-direction bracket, the X-direction fixed pulley is installed on the X-direction bracket, and the positions of the X-direction bracket and the Y-direction bracket on the frame are adjustable.

[0011] Preferably, the X-axis fixed pulley and the Y-axis fixed pulley are located on opposite sides of the workbench.

[0012] Preferably, the rack comprises a panel and support columns installed below the panel, at least three support columns are provided, and the height of each support column is adjustable.

[0013] Preferably, the host computer is installed with capture data error acquisition software.

[0014] Preferably, the laser interferometer includes a laser head and an interferometer mirror mounted on the frame, and also includes a reflector mounted on the load seat. The laser head, the interferometer mirror and the reflector are in the same horizontal plane and collinear, and the direction of the collinearity is parallel to the moving direction of the moving mechanism on the upper layer of the workbench.

[0015] An experimental method for measuring the dynamic positioning error of a machine tool worktable under the action of three-dimensional cutting force, comprising the above-mentioned device, suspending a mass block at the end of a flexible rope, simulating the cutting force of the load seat in the X and Y directions through the force decomposed by the flexible rope in the X and Y directions of the load seat, changing the movement speed of the X-direction moving mechanism and the Y-direction moving mechanism, the size of the mass block or the different positions of the worktable and measuring the displacement error of the worktable with a laser interferometer, and realizing the influence of the dynamic positioning error of the upper moving mechanism of the worktable. Preferably, the cutting force in the vertical direction can be simulated by placing a load on the load seat.

[0016] The experimental method for measuring the dynamic positioning error of the machine tool table under the action of three-dimensional cutting force includes the following scheme design: Under the complex working conditions of CNC machine tools, the core goal of the dynamic positioning error model of the CNC table under the comprehensive influence of multiple factors is to establish the mapping relationship between factors such as cutting force size, movement speed and position and the positioning error of the table. Considering the influence of the dynamic positioning error of the machine tool XY table on the upper moving mechanism of the table under different cutting forces, different speeds, and different positions (the spatial position of the XY moving mechanism (the spatial position of the table) and the cutting point position), the dynamic positioning error data of the XY table under various specific conditions are required. The XL-80 laser interferometer and the customized pulley block are used to measure the dynamic error data of the table under different conditions. The relationship between cutting force and error is studied, and mass blocks of different weights (mass blocks can be weights) are used to simulate the change of cutting force. By changing different speeds and different action point positions, the dynamic positioning error data of CNC machine tools under different cutting force sizes, different movement speeds, and different action point positions are obtained through interval sampling. The specific steps are:

[0017] S1: Change the cutting force, and keep the rest unchanged:

[0018] In the experiment, a load (which can be a weight) is placed on the load seat on the workbench, and the gravity of the load is used to simulate the vertical cutting force F. z N, use one end of the flexible rope (can be a thin wire) to fix the load on the workbench, pass through the fixed pulley in turn and hang a mass block on the end of the flexible rope, and use the gravity of the mass block to simulate the cutting force on the X-axis and Y-axis during actual machining of the machine tool. The default X-axis cutting force is F X and Y radial cutting force F y The calculation formula is F X =0.5*F z , F y =0.4*F z To replace the size of the cutting force on the machine tool, by changing the gravity of the mass block at the end of the X and Y flexible ropes, the change of the three-dimensional cutting force actually exerted on the machine tool can be simply and conveniently simulated. By changing the size of the cutting force and keeping the rest unchanged, the dynamic positioning error data at different cutting force sizes can be measured using a laser interferometer.

[0019] S2: Change the speed, and keep the rest unchanged

[0020] Use motion control card to program the X-axis moving mechanism and Y-axis moving mechanism to control the movement speed of the worktable so that the worktable can perform single-axis movement. The running speed of the X-axis moving mechanism is Vmm / s. The speed is changed through computer programming, while the rest remains unchanged. The dynamic positioning error data at different speeds is measured by laser interferometer.

[0021] S3: Change different spatial positions, and keep the rest unchanged

[0022] The X-axis moving mechanism and Y-axis moving mechanism of the workbench have a stroke of 0-200mm. When the Y-axis moving mechanism of the lower layer is in different strokes, that is, the different spatial positions of the Y-axis moving mechanism of the lower layer affect the dynamic positioning error of the X-axis moving mechanism of the upper layer. By changing the different strokes of the Y-axis moving mechanism of the lower layer and keeping the rest unchanged, the dynamic positioning error data of the Y-axis moving mechanism to the upper X-axis moving mechanism at different spatial positions are measured by a laser interferometer.

[0023] S4: When loading different cutting forces, change the loading position and keep the rest unchanged

[0024] Different cutting force action point positions are applied on the workbench respectively, and the dynamic positioning error data of different cutting force action points on the upper X-axis moving mechanism are measured by laser interferometer.

[0025] In order to ensure the accuracy of the data during the measurement, each measurement point needs to be measured three times. Finally, the average value of these three measurement data is taken as the final dynamic error value of the point to effectively reduce the impact of random errors.

[0026] In the present invention, the proposed experimental device and experimental method for measuring the dynamic positioning error of the machine tool worktable under the action of three-dimensional cutting force, the ingenious design of the fixed pulley and the whole set of experimental devices can simulate the three-dimensional space cutting force of the machine tool in the real environment, and realize the direct measurement of the dynamic positioning error of the worktable when the machine tool is subjected to the three-dimensional cutting force. The positioning accuracy of the worktable can be improved to further improve the processing accuracy.

[0027] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the structure of the present invention;

[0029] Figure 2 It is a schematic diagram of the structure of the X-direction moving mechanism and the Y-direction moving mechanism of the present invention;

[0030] Figure 3 It is a schematic diagram of cutting force loading of the present invention;

[0031] Figure 4 The experimental method of the device of the present invention is different positions of the cutting force action point;

[0032] Figure 5 This is a schematic diagram of the Y-axis fixed pulley structure of the present invention;

[0033] Figure 6 It is a schematic diagram of the structure of the load seat of the present invention;

[0034] In the figure: 1. frame; 2. workbench; 3. load seat; 4. load; 5. X-axis moving mechanism; 6. Y-axis moving mechanism; 7. bottom plate support; 8. Y-axis guide rail; 9. support plate; 10. X-axis guide rail; 11. fixed column; 12. X-axis flexible rope; 13. Y-axis flexible rope; 14. X-axis fixed pulley; 15. Y-axis fixed pulley; 16. X-axis mass block; 17. Y-axis mass block; 18. X-axis bracket; 19. Y-axis bracket; 20. laser head; 21. interferometer; 22. reflector; 23. host computer; 24. guide pulley. DETAILED DESCRIPTION

[0035] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar symbols throughout represent the same or similar elements or elements with the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0036] like Figure 1-Figure 5 An experimental device for measuring the dynamic positioning error of an XY worktable 2 of a machine tool under the action of a three-dimensional cutting force is shown, comprising a frame 1 and a worktable 2 mounted on the frame 1, an X-direction moving mechanism 5 and a Y-direction moving mechanism 6 are also provided on the frame 1, the X-direction moving mechanism 5 is used to drive the worktable 2 to move along the X direction, the Y-direction moving mechanism 6 is used to drive the worktable 2 to move along the Y direction, the X-direction moving mechanism 5 is a ball screw transmission mechanism and the Y-direction moving mechanism 6 is a ball screw transmission mechanism, specifically, comprising a bottom plate support 7 mounted on a bracket, a symmetrical Y guide rail 8 is distributed on the bottom support, a support plate 9 is installed on the bottom support through the Y-direction moving mechanism 6, the support plate 9 is slidably connected to the Y guide rail 8, a symmetrical X guide rail 10 is distributed on the support plate 9, the worktable 2 is connected to the support plate 9 through the X-direction moving mechanism 5 and the worktable 2 is slidably connected to the X guide rail 10;

[0037] A load seat 3 is provided on the workbench 2, and a load 4 is placed on the load seat 3 to simulate the cutting force of the workbench 2 in the vertical direction;

[0038] like Figure 6 As shown, a vertical fixing column 11 may be provided on the load seat 3, and an annular load 4 of different masses may be sleeved on the fixing column 11. Preferably, a plurality of fixing holes are provided on the load 4, and the plurality of fixing holes are distributed along the circumference of the load 4, so that the flexible ropes can be connected to different fixing holes to change the relative position of the load 4 and the flexible rope;

[0039] A fixed pulley is installed on the frame 1 for transverse rotation, and also includes a flexible rope, one end of the flexible rope is fixed on the load seat 3, and the other end of the flexible rope is hung with a mass block after passing through the fixed pulley. The height of the mass block is lower than the height of the workbench 2. The mass block simulates the cutting force of the load seat 3 in the X direction and / or the cutting force in the Y direction by stretching the load seat 3 through the fixed pulley and the flexible rope. The decomposition of the gravity of the mass block in the X direction and the Y direction is the cutting force of the load seat 3 in the X direction and the cutting force in the Y direction.

[0040] The frame 1 is provided with a laser interferometer for detecting the displacement of the workbench 2, and the laser interferometer is an XL-80 laser interferometer;

[0041] It also includes a host computer, the laser interferometer is connected to the host computer and the displacement of the workbench 2 detected by the laser interferometer is transmitted to the host computer, and the capture data error acquisition software is installed in the host computer;

[0042] The laser interferometer includes a laser head and an interferometer mounted on a frame 1. Specifically, the laser head is placed on the ground through a tripod, and also includes a reflector mounted on a load seat 3. The interferometer is located between the reflector and the laser head. The laser head, the interferometer and the reflector are in the same horizontal plane and collinear, and the collinear direction is parallel to the moving direction of the moving mechanism on the upper layer of the workbench 2. If the X-direction moving mechanism 5 is located above the Y-direction moving mechanism 6, the moving mechanism on the upper layer is the X-direction moving mechanism 5. In this embodiment, the X-direction moving mechanism 5 is located above the Y-direction moving mechanism 6, so the collinear direction of the three is parallel to the X direction; the light emitted by the laser head is mapped onto the reflector through the interferometer, and the best effect is achieved by adjusting the signal so that all five LED lights on the upper front of the laser head are lit green. The laser head is connected to the host computer via a USB interface;

[0043] Specifically, the mass block includes an X-direction mass block 16 and a Y-direction mass block 17, the fixed pulley includes an X-direction fixed pulley 14 and a Y-direction fixed pulley 15, the flexible rope includes an X-direction flexible rope 12 and a Y-direction flexible rope 13, one end of the X-direction flexible rope 12 is fixed on the load seat 3, and the other end of the X-direction flexible rope 12 is passed around the X-direction fixed pulley 14 and then suspended with the X-direction mass block 16; one end of the Y-direction flexible rope 13 is fixed on the load seat 3, and the other end of the Y-direction flexible rope 13 is passed around the Y-direction fixed pulley 15 and then suspended with the Y-direction mass block 17.

[0044] Preferably, it also includes an X-direction bracket 18 and a Y-direction bracket 19 mounted on the frame 1, the X-direction fixed pulley 14 is mounted on the X-direction bracket 18, the X-direction fixed pulley 14 is mounted on the X-direction bracket 18, and the positions of the X-direction bracket 18 and the Y-direction bracket 19 on the frame 1 are adjustable, such as Figure 5As shown, the Y-axis bracket 19 has a transverse plate and a vertical plate, the axial direction of the Y-axis fixed pulley 15 is along the X-direction, and a Y-axis fixed pulley 15 is provided on the transverse plate and the vertical plate. It should be noted that the X-axis bracket 18 has a transverse plate and a vertical plate like the Y-axis bracket 19, and the transverse plate and the vertical plate are both provided with an X-axis fixed pulley 14.

[0045] Preferably, the X-axis fixed pulley 14 and the Y-axis fixed pulley 15 are located on opposite sides of the workbench 2 .

[0046] Preferably, a guide pulley 24 is provided on the workbench 2 , and the guide pulley 24 is located between the Y-direction fixed pulley 15 and the load seat 3 and is used to guide the Y-direction flexible rope 13 .

[0047] Preferably, the rack 1 includes a panel and support columns installed below the panel, and there are at least three support columns, and the height of each support column is adjustable.

[0048] An experimental method for measuring the dynamic positioning error of a machine tool XY worktable 2 under the action of a three-dimensional cutting force specifically includes the following:

[0049] 1) Dynamic positioning error measurement of workbench 2 under different cutting forces and different movement speeds:

[0050] The influence of the X-axis moving mechanism 5 system on the XY worktable 2 on the dynamic error of the worktable 2 under different three-dimensional cutting force sizes and different movement speeds. A vertical load 4 of 40N is loaded on the worktable 2 and the X-axis suspended mass block is used to simulate a given cutting force. The movement speed of the X-axis moving mechanism 5 is set to 1mm / s, the measuring stroke is 200mm, and interval sampling is performed at every 5mm to measure the dynamic positioning error of the X-axis moving mechanism 5 of the worktable 2.

[0051] S1: changing different vertical loads 4, hanging different mass blocks in X and Y to simulate different cutting force magnitudes, while keeping the speed unchanged and the same position, repeating the above steps can measure the dynamic positioning error of the X-direction moving mechanism 5 at different cutting force magnitudes and the same speed;

[0052] S2: Programming the X-axis moving mechanism 5 and the Y-axis moving mechanism 6 through the motion control card, changing different movement speeds, while keeping the cutting force and position unchanged, the dynamic positioning error data of the upper X-axis moving mechanism 5 at different movement speeds can be measured.

[0053] Each set of experiments was repeated three times and the average value was taken to calculate its final dynamic error.

[0054] 2) Dynamic positioning error measurement of workbench 2 at different cutting action points:

[0055] The influence of different cutting force action points (different torques) on the dynamic error of the upper X-direction moving mechanism 5; when different cutting forces are loaded on the worktable 2, the loading position is changed, such as Figure 5 As shown, the gray square is the 2nd surface of the workbench. The cutting force is applied to the workbench 2 at two positions, A and B. When the position of the cutting force point is changed, the dynamic positioning error of the workbench 2 at different cutting force points is measured.

[0056] 3) Dynamic positioning error measurement when the Y-direction moving mechanism 6 of the lower layer of the workbench 2 is in different positions:

[0057] The XY worktable 2 is a two-dimensional stacking structure, and the influence of the lower Y-direction moving mechanism 6 on the dynamic error of the upper X-direction moving mechanism 5 when it is in different positions is considered; that is, when a given cutting force is applied, the Y-direction moving mechanism 6 is moved to five different positions of 0mm, 50mm, 100mm, 150mm and 200mm respectively, and the dynamic positioning error of the upper X-direction moving mechanism 5 of the worktable 2 is measured when the lower Y-direction moving mechanism 6 is in different positions.

[0058] The above is only an experimental method for when the upper X-axis moving mechanism 5 of the XY worktable 2 performs a single movement, and is also applicable when the double guide rails of the X-axis moving mechanism 5 and the Y-axis moving mechanism 6 move simultaneously.

[0059] It should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0060] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0061] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0062] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0063] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. An experimental device for measuring the dynamic positioning error of a machine tool worktable under the action of three-dimensional cutting force, comprising a frame (1) and a worktable (2) mounted on the frame (1), wherein the frame (1) is further provided with an X-direction moving mechanism (5) and a Y-direction moving mechanism (6), wherein the X-direction moving mechanism (5) is used to drive the worktable (2) to move along the X direction, and the Y-direction moving mechanism (6) is used to drive the worktable (2) to move along the Y direction, and wherein: The workbench (2) is provided with a load seat (3), and a load (4) is placed on the load seat (3) to simulate the cutting force applied to the workbench (2) in the vertical direction; The frame (1) is provided with a fixed pulley for transverse rotation, and further comprises a flexible rope, one end of the flexible rope being fixed on the load seat (3), and the other end of the flexible rope being hung with a mass block after passing through the fixed pulley, the height of the mass block being lower than the height of the workbench (2), and the mass block simulates the cutting force of the load seat (3) in the X direction and / or the cutting force in the Y direction by stretching the load seat (3) through the fixed pulley and the flexible rope, and the decomposition of the gravity of the mass block in the X direction and the Y direction is the cutting force of the load seat (3) in the X direction and the cutting force in the Y direction; The frame (1) is provided with a laser interferometer for detecting the displacement of the workbench (2); It also includes a host computer, the laser interferometer is connected to the host computer and transmits the displacement of the workbench (2) detected by the laser interferometer to the host computer.

2. The experimental device for measuring the dynamic positioning error of a machine tool table under the action of three-dimensional cutting force according to claim 1 is characterized in that: The X-direction moving mechanism (5) is a ball screw transmission mechanism and / or the Y-direction moving mechanism (6) is a ball screw transmission mechanism.

3. The experimental device for measuring the dynamic positioning error of a machine tool table under the action of three-dimensional cutting force according to claim 1 is characterized in that: The fixed pulley comprises an X-direction fixed pulley (14) and a Y-direction fixed pulley (15); the flexible rope comprises an X-direction flexible rope (12) and a Y-direction flexible rope (13); one end of the X-direction flexible rope (12) is fixed to the load seat (3); the other end of the X-direction flexible rope (12) is passed around the X-direction fixed pulley (14) and then suspended with an X-direction mass block (16); one end of the Y-direction flexible rope (13) is fixed to the load seat (3); the other end of the Y-direction flexible rope (13) is passed around the Y-direction fixed pulley (15) and then suspended with a Y-direction mass block (17).

4. The experimental device for measuring the dynamic positioning error of a machine tool table under the action of three-dimensional cutting force according to claim 3 is characterized in that: It also comprises an X-direction bracket (18) and a Y-direction bracket (19) mounted on the frame (1), the X-direction fixed pulley (14) being mounted on the X-direction bracket (18), the X-direction fixed pulley (14) being mounted on the X-direction bracket (18), and the positions of the X-direction bracket (18) and the Y-direction bracket (19) on the frame (1) being adjustable.

5. The experimental device for measuring the dynamic positioning error of a machine tool table under the action of three-dimensional cutting force according to claim 3 is characterized in that: The X-direction fixed pulley (14) and the Y-direction fixed pulley (15) are located on two opposite sides of the workbench (2).

6. The experimental device for measuring the dynamic positioning error of a machine tool table under the action of three-dimensional cutting force according to claim 5 is characterized in that: The workbench (2) is provided with a guide pulley (24), which is located between the Y-direction fixed pulley (15) and the load seat (3) and is used to guide the Y-direction flexible rope (13).

7. The experimental device for measuring the dynamic positioning error of a machine tool table under the action of three-dimensional cutting force according to claim 1 is characterized in that: The frame (1) comprises a panel and a support column installed below the panel, at least three support columns are provided, and the height of each support column is adjustable.

8. The experimental device for measuring the dynamic positioning error of a machine tool table under the action of three-dimensional cutting force according to claim 1 is characterized in that: The host computer is installed with capture data error acquisition software.

9. The experimental device for measuring the dynamic positioning error of a machine tool table under the action of three-dimensional cutting force according to claim 1 is characterized in that: The laser interferometer comprises a laser head and an interferometer mirror mounted on the frame (1), and also comprises a reflector mirror mounted on the load seat (3); the laser head, the interferometer mirror and the reflector mirror are located in the same horizontal plane and are collinear, and the collinear direction is parallel to the moving direction of the moving mechanism on the upper layer of the workbench (2).

10. The experimental method for measuring the dynamic positioning error of a machine tool table under the action of three-dimensional cutting force according to claim 1, characterized in that: The device comprises a device as claimed in any one of claims 1 to 9, wherein a vertical cutting force is simulated by placing a vertical mass block on a load seat (3), the cutting force of the load seat (3) in the X direction and the Y direction is simulated by suspending the mass block at the end of a flexible rope through the force decomposed by the flexible rope in the X direction and the Y direction of the load seat (3), and the displacement error of the moving mechanism located at the upper layer is measured by a laser interferometer by changing the movement speed of the X-moving mechanism (5) and the Y-moving mechanism (6), the size of the mass block or the different positions of the workbench.

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