LU501758B1 - 13-step measurement method for geometric error measurement of machine tool - Google Patents
13-step measurement method for geometric error measurement of machine tool Download PDFInfo
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/18—Numerical control [NC], i.e. automatically operating machines, in particular machine tools, e.g. in a manufacturing environment, so as to execute positioning, movement or co-ordinated operations by means of programme data in numerical form
- G05B19/401—Numerical control [NC], i.e. automatically operating machines, in particular machine tools, e.g. in a manufacturing environment, so as to execute positioning, movement or co-ordinated operations by means of programme data in numerical form characterised by control arrangements for measuring, e.g. calibration and initialisation, measuring workpiece for machining purposes
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
- G05B2219/30—Nc systems
- G05B2219/37—Measurements
- G05B2219/37581—Measuring errors
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
- G05B2219/30—Nc systems
- G05B2219/45—Nc applications
- G05B2219/45136—Turning, lathe
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P90/00—Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
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Abstract
The consists of a 9-step linear measurement trajectory and a 4-step stepped measurement trajectory; the 9-step linear measurement trajectory can be summarized as nine measurement trajectories of three single-axis motions of X-axis, Y-axis, and Z-axis, with the geometric space of 1000mm×500mm×500mm as the measurement object, the trajectory ??? is the measurement trajectory of X-axis motion, the trajectory ??? is the measurement trajectory of Z-axis motion, and the trajectory ??? is the measurement trajectory of Y-axis motion. The present invention performs measurement by dividing the whole step into two steps, which can be selected according to the measurement requirements, and the stepped measurement method is adopted in the multi- axis linkage measurement. The stepped motion trajectory can more conveniently identify the rotation angle error of the single axis and the associated perpendicularity error, and reduce the cumbersome labor in adjusting the optical path at the same time.
Description
DESCRIPTION LU501758 13-STEP MEASUREMENT METHOD FOR GEOMETRIC ERROR MEASUREMENT
TECHNICAL FIELD The invention relates to the technical field of manufacturing and processing of numerically controlled machine tools, in particular to a 13-step measurement method for geometric error measurement of machine tool.
BACKGROUND CNC machine tool is an automatic machine tool, which is an automatic machine tool equipped with a program control system. The control system can logically process the program with control codes or other symbolic instructions, decode it, express it with coded numbers, input the numerical control device through the information carrier, and after arithmetic processing, the numerical control device sends various control signals to control the action of the machine tool, and automatically processes the parts according to the shape and size required by the drawing.
At present, there are various methods used for geometric error measurement of machine tools, but they do not take into account the problems of measurement time-consuming and comprehensiveness of measurement errors in geometric error measurement. Some simplify the multi-axis linkage in order to reduce time for geometric measurement, and some spend more time on optical path adjustment in measuring multi-axis linkage in order to perform multi-axis linkage measurement.
SUMMARY Related to the shortcomings in the background technology, the invention provides a 13-step measurement method for geometric error measurement of machine tool.
Technical solutions of the disclosure are described as follows. À 13-step measurement method for geometric error measurement of machine tool, it consists of a 9-step linear measurement trajectory and a 4-step stepped measurement trajectory; the 9-step linear measurement trajectory can be summarized as nine measurement trajectories of three single-axis motions of X-axis, Y-axis,
and Z-axis, with the geometric space of 1000mmx500mmx500mm as the measurement object, théJ501758 trajectory (1)(2)(3) is the measurement trajectory of X-axis motion, the trajectory (4)(5)(6) is the measurement trajectory of Z-axis motion, and the trajectory (7)(8)(9) is the measurement trajectory of Y-axis motion; the 4-step stepped measurement trajectory can be summarized as the measurement path (10) generated by XY two-axis linkage, the measurement path (1) generated by YZ two-axis linkage, the measurement path (2) generated by ZX two-axis linkage and the measurement path (13) generated by XYZ three-axis linkage.
As a preferably mode of the invention, the 9-step linear measurement trajectory is a linear trajectory along each specified edge of the measured geometric space; the 4-step stepped measurement trajectory is along the diagonals on each surface of the measured geometric space; the XY axis linkage motion trajectory is stepped and other various step-by-step methods, the YZ axis linkage motion trajectory is stepped and other various step-by-step methods, the ZX axis linkage motion trajectory is stepped and other various step-by-step methods, and the XYZ axis linkage motion trajectory is stepped and other various step-by-step methods.
As a preferably mode of the invention, the measurement sequence of the 13-step measurement method is to collect the positioning errors at the measurement points in turn according to the trajectory (1) to the trajectory (3).
Measurement methods comprise the followings: S1, the geometric space of the CNC machine tool of 1000mmx500mmx500mm is taken as the measurement object, and the lower left corner of the front end of the three-axis CNC machine tool table is set as the absolute coordinate origin, and the Cartesian coordinate system is established with this origin; S2, the 9-step linear measurement trajectory can be summarized as nine measurement trajectories of three single-axis motions of X-axis, Y-axis, and Z-axis, the trajectory (1)(2)(3) is the measurement trajectory of X-axis motion, the trajectory (4)(5)(6) is the measurement trajectory of Z-axis motion, and the trajectory (7)(8)(9) is the measurement trajectory of Y-axis motion; The 9-step single-axis motion is carried out along each designated edge of the measured geometric space and the trajectory is a straight line, and the measuring instrument is a laser interferometer; S3, the 4-step stepped measurement trajectory can be summarized as the measurement path generated by XY two-axis linkage, the measurement path (11) generated by YZ two-axis linkage, the measurement path (2) generated by ZX two-axis linkage and the measurement path (13)
generated by XYZ three-axis linkage; all measurement paths are carried out along the diagonal&J501758 on each face of the measured geometric space and the volume diagonal on the space, and the trajectory is stepped, where the XY axis linkage motion trajectory is stepped and other various step-by-step methods, which is the actual running trajectory of path (10); the YZ axis linkage motion trajectory is stepped and other various step-by-step methods, which is the actual running trajectory of path (1D); the ZX axis linkage motion trajectory is stepped and other various step-by-step methods, which is the actual running trajectory of path (2); and the XYZ axis linkage motion trajectory is stepped and other various step-by-step methods, which is the actual running trajectory of path (3); the measuring instrument is a laser Doppler displacement measuring instrument.
As a preferably mode of the invention, in step S2, edit the numerical control program to make the machine tool perform a trial operation along the trajectory (1), that is, perform single-axis motion along the X-axis direction; after the test run of the machine tool, install the laser interferometer in the corresponding position on the machine tool according to the installation requirements of the laser interferometer, and then, follow the ISO230-2 standard to select the appropriate interval distance for quasi-static measurement; where the interval distance is 40mm, corresponding to 26 data acquisition points, the machine tool stays at the data acquisition point for seconds, collects the positioning error data of the machine tool running for 5 cycles, and transmits the collected data to the computer to draw images and other related data.
As a preferably mode of the invention, in step S2, from the second step to the ninth step, the measurement trajectories are measured in sequence according to (2) to (9), because the running distance of the Y-axis and the Z-axis is short, the interval distance is 20mm, and the others are the same as the first step.
As a preferably mode of the invention, in step S3, the 4-step is the positioning error measurement method of multi-axis linkage; the tenth step is to edit the numerical control program to make the machine tool run along the trajectory (10), that is, XY axis linkage is required and the machine tool program runs according to the stepped trajectory in Figure 2, which is different from the body diagonal measurement method in the existing 13-line measurement method; this method does not need to point the mirror to the direction of diagonal movement, but uses the laser Doppler displacement measuring instrument to perform step-by-step measurement in the X and Y directions, where the measurement increments in the X and Y directions are 40mm and 20mm respectively, and the quasi-static measurement point is set at the corner of each line segment; the specific measurement process can be summarized as starting from the origin, moving 40mm along the kU501758 axis direction, pausing and automatically collecting data, and then moving 20mm along the Y-axis direction, pausing and automatically collecting data; there are 51 corresponding collection points, and collecting the positioning error data of the machine tool for 3 cycles.
As a preferably mode of the invention, in step S3, in the eleventh step, the twelfth step, and the thirteenth step, the measurement trajectory is measured in sequence according to 101213), the trajectory (11) is generated by the linkage of YZ axis, the trajectory (12) is generated by the linkage of ZX axis, and the trajectory (13) is generated by the linkage of XYZ axis, where the increment of trajectory (13) in the Z-axis direction is 20mm, and the others are the same as the tenth step.
The present invention performs measurement by dividing the whole step into two steps, which can be selected according to the measurement requirements, and the stepped measurement method is adopted in the multi-axis linkage measurement. The stepped motion trajectory can more conveniently identify the rotation angle error of the single axis and the associated perpendicularity error, and reduce the cumbersome labor in adjusting the optical path at the same time.
BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a schematic diagram of the 13-step geometric error measurement method of the present invention; Fig. 2 is a schematic diagram of a stepped trajectory of the XY axis linkage of the present invention; Fig. 3 is a schematic diagram of a stepped trajectory of the YZ axis linkage of the present invention; Fig. 4 is a schematic diagram of a stepped trajectory of the ZX axis linkage of the present invention; Fig. 5 is a schematic diagram of a stepped trajectory of the XYZ axis linkage of the present invention; Fig. 6 is a plane expansion diagram of the stepped trajectory of the XYZ axis linkage of the present invention; Fig. 7 is the trajectory (8) positioning error data image of the present invention; Fig. 8 is the trajectory (10) positioning error data image of the present invention.
DETAILED DESCRIPTION OF EMBODIMENTS LU501758 The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, said embodiments are only a part of the embodiments of the present application, but not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without inventive work fall within the protection scope of the present application.
The present invention provides a technical solution: a 13-step measurement method for geometric error measurement of machine tool, wherein it consists of a 9-step linear measurement trajectory and a 4-step stepped measurement trajectory; the 9-step linear measurement trajectory can be summarized as nine measurement trajectories of three single-axis motions of X-axis, Y-axis, and Z-axis, with the geometric space of 1000mmx500mmx500mm as the measurement object, the trajectory (1)(2)(3) is the measurement trajectory of X-axis motion, the trajectory (4)(5)(6) is the measurement trajectory of Z-axis motion, and the trajectory (7)(8)(9) is the measurement trajectory of Y-axis motion; the 4-step stepped measurement trajectory can be summarized as the measurement path (10) generated by XY two-axis linkage, the measurement path (1) generated by YZ two-axis linkage, the measurement path (2) generated by ZX two-axis linkage and the measurement path (13) generated by XYZ three-axis linkage; the 9-step linear measurement trajectory is a linear trajectory along each specified edge of the measured geometric space; the 4- step stepped measurement trajectory is along the diagonals on each surface of the measured geometric space; the XY axis linkage motion trajectory is stepped and other various step-by-step methods, the YZ axis linkage motion trajectory is stepped and other various step-by-step methods, the ZX axis linkage motion trajectory is stepped and other various step-by-step methods, and the XYZ axis linkage motion trajectory is stepped and other various step-by-step methods; the measurement sequence of the 13-step measurement method is to collect the positioning errors at the measurement points in turn according to the trajectory (1) to the trajectory (3).
Measurement methods comprise the followings: S1, the geometric space of the CNC machine tool of 1000mmx500mmx500mm is taken as the measurement object, and the lower left corner of the front end of the three-axis CNC machine tool table is set as the absolute coordinate origin, and the Cartesian coordinate system is established with this origin;
S2, the 9-step linear measurement trajectory can be summarized as nine measuremeht/501758 trajectories of three single-axis motions of X-axis, Y-axis, and Z-axis, the trajectory (1)(2)(3) is the measurement trajectory of X-axis motion, the trajectory (4)(5)(6) is the measurement trajectory of Z-axis motion, and the trajectory (7)(8)(9) is the measurement trajectory of Y-axis motion; The 9-step single-axis motion is carried out along each designated edge of the measured geometric space and the trajectory is a straight line, and the measuring instrument is a laser interferometer; S3, the 4-step stepped measurement trajectory can be summarized as the measurement path generated by XY two-axis linkage, the measurement path (11) generated by YZ two-axis linkage, the measurement path (2) generated by ZX two-axis linkage and the measurement path (13) generated by XYZ three-axis linkage; all measurement paths are carried out along the diagonals on each face of the measured geometric space and the volume diagonal on the space, and the trajectory is stepped, where the XY axis linkage motion trajectory is stepped and other various step-by-step methods, which is the actual running trajectory of path (10); the YZ axis linkage motion trajectory is stepped and other various step-by-step methods, which is the actual running trajectory of path (1D); the ZX axis linkage motion trajectory is stepped and other various step-by-step methods, which is the actual running trajectory of path (2); and the XYZ axis linkage motion trajectory is stepped and other various step-by-step methods, which is the actual running trajectory of path (3); the measuring instrument is a laser Doppler displacement measuring instrument.
In step S2, edit the numerical control program to make the machine tool perform a trial operation along the trajectory (1), that is, perform single-axis motion along the X-axis direction; after the test run of the machine tool, install the laser interferometer in the corresponding position on the machine tool according to the installation requirements of the laser interferometer, and then, follow the ISO230-2 standard to select the appropriate interval distance for quasi-static measurement; where the interval distance is 40mm, corresponding to 26 data acquisition points, the machine tool stays at the data acquisition point for 10 seconds, collects the positioning error data of the machine tool running for 5 cycles, and transmits the collected data to the computer to draw images and other related data.
In step S2, from the second step to the ninth step, the measurement trajectories are measured in sequence according to (2) to (9), because the running distance of the Y-axis and the Z-axis is short, the interval distance is 20mm, and the others are the same as the first step.
In step S3, the 4-step is the positioning error measurement method of multi-axis linkage; the tenth step is to edit the numerical control program to make the machine tool run along the trajectotyJ501758 (10), that is, XY axis linkage is required and the machine tool program runs according to the stepped trajectory in Figure 2, which is different from the body diagonal measurement method in the existing 13-line measurement method; this method does not need to point the mirror to the direction of diagonal movement, but uses the laser Doppler displacement measuring instrument to perform step-by-step measurement in the X and Y directions, where the measurement increments in the X and Y directions are 40mm and 20mm respectively, and the quasi-static measurement point is set at the corner of each line segment; the specific measurement process can be summarized as starting from the origin, moving 40mm along the x-axis direction, pausing and automatically collecting data, and then moving 20mm along the Y-axis direction, pausing and automatically collecting data; there are 51 corresponding collection points, and collecting the positioning error data of the machine tool for 3 cycles.
In step S3, in the eleventh step, the twelfth step, and the thirteenth step, the measurement trajectory is measured in sequence according to (1)(2)03), the trajectory (1) is generated by the linkage of YZ axis, the trajectory (2) is generated by the linkage of ZX axis, and the trajectory (13) is generated by the linkage of XYZ axis, where the increment of trajectory (3) in the Z-axis direction is 20mm, and the others are the same as the tenth step.
Embodiment 1 The present invention provides a technical solution: a 13-step measurement method for geometric error measurement of machine tool, using the 13-step geometric error measurement method to measure the positioning error of single-axis motion, taking the eighth line (i.e. the eighth step) in Figure 1 as an example to measure, and combine the actual measurement situation to establish a Cartesian coordinate system with B as the origin. First, the optical lens group is installed on the machine tool table, then the optical path generated by the laser head in the laser interferometer is directed to the lens, and the relative position of the optical lens group is adjusted to achieve the purpose of measuring the distance, and the single-axis motion is measured as linear motion, which is very convenient in terms of optical path adjustment. The data obtained is now plotted and shown in Figure 7 as -4.265 microns, R is 9.958 microns, and A is 28.204 microns. To obtain the other 21 geometric errors, it is necessary to continue to obtain the positioning errors from the trajectory (1) to (3) of the above method, and then combine the error identification methods in the 22-line, 15-line, 12-line and 9-line measurement methods to obtain the angle error,
straightness error and perpendicularity error. LU501758 The error data of the 13-step geometric error measurement method is detected and evaluated using the following international standard ISO230-2:
1. The position deviation is the positioning error measured by the measuring instrument equal to the difference between the actual positionP; jand the target position Piie x; =P;-P.
2. The unidirectional average position deviation is the average deviation calculated by
X _ 12 _ 1. Als Ada Td measuring n times at a certain point, i.e. (positive) and (negative).
3. The bidirectional average position deviation (description point) is the average of the positive average position deviation and the negative average position deviation at a certain point, 2 - x; Tx; Lex; = —. 2
4. The reverse clearance is the difference between the positive average position deviation and the negative average position deviation at a certain position, i.e. B; = X; T —x; |.
5. The average reverse clearance is the average value of m times reverse clearance at a certain . PB 1 point, ie B = — X, B;.
m
6. The evaluation value of unidirectional repetition accuracy is the standard deviation of _ 2 . LL 1 — 12 _ position deviation at a certain point, ie. S; T= —X (0; T —Xi) (positive) and S; I= 1 —\2 . |= X (x; J —X;) (negative).
7. The unidirectional position repetition accuracy (description point) is 4 times of the unidirectional repetition accuracy evaluation value at a certain point, ie. R; T= 45; T (positive) and R; l= 45; | (negative).
8. Bidirectional position repetition accuracy (description point) R; = max[2S; 1 +25; | +|B;;R; 1; R; 4]
9. Bidirectional position repetition accuracy (description axis)
R = max[R;] LU501758
10. Bidirectional positioning system deviation E = max[ %; 1; X; 4] — min[x; 1; x; |]
11. Bidirectional average position deviation (describe axis) M = max|[x;] — min[x;]
12. Bidirectional positioning accuracy (description axis) A = max|x; T +25; 1, %; L +25; L] — min[x; T —25; 1; x; L —25; 4] Embodiment 2 The present invention provides a technical solution: a 13-step measurement method for geometric error measurement of machine tool, using the 13-step geometric error measurement method to measure the positioning error of multi-axis linkage, taking the tenth line (i.e. the tenth step) in Figure 1 as an example to measure, combine the actual measurement situation to establish a Cartesian coordinate system with B as the origin, and the instrument used here is a laser Doppler displacement measuring instrument. First, the optical lens group is installed on the machine tool table, then the optical path generated by the laser head in the laser interferometer is directed to the lens, and the relative position of the optical lens group is adjusted to achieve the purpose of measuring the distance, and the motion trajectory of multi-axis linkage is a stepped motion trajectory, which reduces the burden on light adjustment compared to directly measuring the diagonal positioning error. The data obtained is now plotted and shown in Figure 8 as 1.693 microns, R is 5.520 microns, and A is 24.444 microns. To obtain the other 21 geometric errors, it is necessary to continue to obtain the positioning errors from the trajectory (1) to (3) of the above method, and then combine the error identification methods in the 22-line, 15-line, 12-line and 9- line measurement methods to obtain the angle error, straightness error and perpendicularity error.
In summary, the present invention performs measurement by dividing the whole step into two steps, which can be selected according to the measurement requirements, and the stepped measurement method is adopted in the multi-axis linkage measurement. The stepped motion trajectory can more conveniently identify the rotation angle error of the single axis and the associated perpendicularity error, and reduce the cumbersome labor in adjusting the optical path at the same time; and the 13-step geometric error measurement method does not perform the original oblique movement in the measurement space, but adopts the stepped movement, whi¢tJ501758 can more conveniently design the pause point for measurement, so it can collect data more conveniently; at the same time, the 13-step geometric error measurement method also comprises a 9-step single-axis motion measurement method, which is also applicable when the measuring instrument only has a laser interferometer.
The basic principles and main features of the present invention and the advantages of the present invention have been shown and described above. For those skilled in the art, it is obvious that the invention is not limited to the details of the above exemplary embodiments, and the invention can be implemented in other specific forms without departing from the spirit or basic features of the invention. Therefore, from any point of view, the embodiments should be regarded as exemplary and non limiting. The scope of the invention is limited by the appended claims rather than the above description, and therefore it is intended to include all changes within the meaning and scope of the equivalent elements of the claims in the invention. Any reference numerals in the claims shall not be construed as limiting the involved claim.
In addition, it should be understood that although the description is described in terms of embodiments, not every embodiment contains only one independent technical solution. The description in the specification is only for clarity, and those skilled in the art should take the description as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.
Claims (8)
1. A 13-step measurement method for geometric error measurement of machine tool, wherein it consists of a 9-step linear measurement trajectory and a 4-step stepped measurement trajectory; the 9-step linear measurement trajectory can be summarized as nine measurement trajectories of three single-axis motions of X-axis, Y-axis, and Z-axis, with the geometric space of 1000mmx500mmx500mm as the measurement object, the trajectory (1)(2)(3) is the measurement trajectory of X-axis motion, the trajectory (4)(5)(6) is the measurement trajectory of Z-axis motion, and the trajectory (7)(8)(9) is the measurement trajectory of Y-axis motion; the 4-step stepped measurement trajectory can be summarized as the measurement path generated by XY two- axis linkage, the measurement path (11) generated by YZ two-axis linkage, the measurement path (12) generated by ZX two-axis linkage and the measurement path (13) generated by XYZ three-axis linkage.
2. The method of claim 1, wherein the 9-step linear measurement trajectory is a linear trajectory along each specified edge of the measured geometric space; the 4-step stepped measurement trajectory is along the diagonals on each surface of the measured geometric space; the XY axis linkage motion trajectory is stepped and other various step-by-step methods, the YZ axis linkage motion trajectory is stepped and other various step-by-step methods, the ZX axis linkage motion trajectory is stepped and other various step-by-step methods, and the XYZ axis linkage motion trajectory is stepped and other various step-by-step methods.
3. The method of claim 1, wherein the measurement sequence of the 13-step measurement method is to collect the positioning errors at the measurement points in turn according to the trajectory (1) to the trajectory (3).
4. The method of any one of claims 1-3, comprising the following steps: S1: the geometric space of the CNC machine tool of 1000mmx500mmx500mm is taken as the measurement object, and the lower left corner of the front end of the three-axis CNC machine tool table is set as the absolute coordinate origin, and the Cartesian coordinate system is established with this origin;
S2: the 9-step linear measurement trajectory can be summarized as nine measuremeht/501758 trajectories of three single-axis motions of X-axis, Y-axis, and Z-axis, the trajectory (1)(2)(3) is the measurement trajectory of X-axis motion, the trajectory (4)(5)(6) is the measurement trajectory of Z-axis motion, and the trajectory (7)(8)(9) is the measurement trajectory of Y-axis motion; the 9-step single-axis motion is carried out along each designated edge of the measured geometric space and the trajectory is a straight line, and the measuring instrument is a laser interferometer; S3: the 4-step stepped measurement trajectory can be summarized as the measurement path generated by XY two-axis linkage, the measurement path (11) generated by YZ two-axis linkage, the measurement path (2) generated by ZX two-axis linkage and the measurement path (13) generated by XYZ three-axis linkage; all measurement paths are carried out along the diagonals on each face of the measured geometric space and the volume diagonal on the space, and the trajectory is stepped, where the XY axis linkage motion trajectory is stepped and other various step-by-step methods, which is the actual running trajectory of path (10); the YZ axis linkage motion trajectory is stepped and other various step-by-step methods, which is the actual running trajectory of path (1D); the ZX axis linkage motion trajectory is stepped and other various step-by-step methods, which is the actual running trajectory of path (2); and the XYZ axis linkage motion trajectory is stepped and other various step-by-step methods, which is the actual running trajectory of path (3); the measuring instrument is a laser Doppler displacement measuring instrument.
5. The method of claim 4, wherein in step S2, edit the numerical control program to make the machine tool perform a trial operation along the trajectory (1), that is, perform single-axis motion along the X-axis direction; after the test run of the machine tool, install the laser interferometer in the corresponding position on the machine tool according to the installation requirements of the laser interferometer, and then, follow the ISO230-2 standard to select the appropriate interval distance for quasi-static measurement; where the interval distance is 40mm, corresponding to 26 data acquisition points, the machine tool stays at the data acquisition point for 10 seconds, collects the positioning error data of the machine tool running for 5 cycles, and transmits the collected data to the computer to draw images and other related data.
6. The method of claim 4, wherein in step S2, from the second step to the ninth step, the measurement trajectories are measured in sequence according to (2) to (9), because the running distance of the Y-axis and the Z-axis is short, the interval distance is 20mm, and the others are thé/501758 same as the first step.
7. The method of claim 4, wherein in step S3, the 4-step is the positioning error measurement method of multi-axis linkage; the tenth step is to edit the numerical control program to make the machine tool run along the trajectory (10), that is, XY axis linkage is required and the machine tool program runs according to the stepped trajectory in Figure 2, which is different from the body diagonal measurement method in the existing 13-line measurement method; this method does not need to point the mirror to the direction of diagonal movement, but uses the laser Doppler displacement measuring instrument to perform step-by-step measurement in the X and Y directions, where the measurement increments in the X and Y directions are 40mm and 20mm respectively, and the quasi-static measurement point is set at the corner of each line segment; the specific measurement process can be summarized as starting from the origin, moving 40mm along the x- axis direction, pausing and automatically collecting data, and then moving 20mm along the Y-axis direction, pausing and automatically collecting data; there are 51 corresponding collection points, and collecting the positioning error data of the machine tool for 3 cycles.
8. The method of claim 4, wherein in step S3, in the eleventh step, the twelfth step, and the thirteenth step, the measurement trajectory is measured in sequence according to ()(2(3), the trajectory (11) is generated by the linkage of YZ axis, the trajectory (12) is generated by the linkage of ZX axis, and the trajectory (13) is generated by the linkage of XYZ axis, where the increment of trajectory (13) in the Z-axis direction is 20mm, and the others are the same as the tenth step.
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| US11886162B2 (en) | 2022-02-23 | 2024-01-30 | Guangdong Ocean University | Method for identifying pitch error and yaw error of numerically-controlled (NC) machine tool |
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| CN113093649A (en) * | 2021-04-02 | 2021-07-09 | 广东海洋大学 | 13-step measurement method for measuring geometric errors of machine tool |
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