CN117433464A - Workpiece measuring method, system, equipment and medium based on three-coordinate measuring machine - Google Patents
Workpiece measuring method, system, equipment and medium based on three-coordinate measuring machine Download PDFInfo
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- CN117433464A CN117433464A CN202210826285.9A CN202210826285A CN117433464A CN 117433464 A CN117433464 A CN 117433464A CN 202210826285 A CN202210826285 A CN 202210826285A CN 117433464 A CN117433464 A CN 117433464A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B21/00—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant
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Abstract
The invention discloses a workpiece measuring method, a system, equipment and a medium based on a three-coordinate measuring machine. The method comprises the following steps: acquiring initial measurement data of a workpiece to be measured, and establishing a target workpiece coordinate system according to the initial measurement data; acquiring rotation measurement data of a workpiece to be measured rotating along with a turntable based on a target workpiece coordinate system, and establishing a first measurement coordinate system according to the rotation measurement data; calculating to obtain a workpiece coordinate system correction matrix of the target workpiece coordinate system relative to the first measurement coordinate system; acquiring a measurement coordinate system correction matrix according to a preset indexing angle of rotation of the turntable and the workpiece coordinate system correction matrix; actual measurement data of the turntable at each index window is acquired based on the first measurement coordinate system to the nth measurement coordinate system. The method can reduce errors caused by manual misalignment, improve the detection precision of the workpiece to be detected, avoid reconstructing a measurement coordinate system after entering the next indexing window, and improve the detection efficiency of the three-coordinate measuring machine.
Description
Technical Field
The application relates to the technical field of three-coordinate measurement, in particular to a workpiece measurement method, system, equipment and medium based on a three-coordinate measuring machine.
Background
Three-dimensional measuring devices are devices commonly used in industrial measurements and can be used to measure geometric shapes, lengths, roundness graduations, and the like. The three-coordinate measuring machine can replace various surface measuring tools to carry out high-precision measurement on a measuring target, and measuring functions comprise size precision, positioning precision, geometric precision, contour precision and the like.
In the aircraft engine assembly detection process, when needing to use the three-dimensional measuring machine to detect the spare part of circumference distribution, because the spare part of engine is assembled to the cell cube after, for equipartition circumference distribution in many, it is loaded down with trivial details to use the three-dimensional measuring machine to measure the detection process to measurement accuracy is low, can't satisfy industrial production's fast rhythm. Such as detection of throat area in the turbine unit.
During detection, the area of each window is measured by using a three-coordinate measuring machine, the angle of a workpiece to be detected needs to be adjusted after each index window is measured by using the three-coordinate measuring machine, then a coordinate system is established again by calibration operation to measure the next index window, and the operation process is quite complicated. In actual measurement, it is difficult to ensure that the rotation axis of the turntable and the central axis of the workpiece to be measured are completely coincident, so that a certain error exists in the measurement result.
Disclosure of Invention
In order to solve the technical problems, the application provides a workpiece measuring method, a system, equipment and a medium based on a three-coordinate measuring machine.
In a first aspect, the present application provides a workpiece measurement method based on a three-coordinate measuring machine, wherein a workpiece to be measured is fixed on a turntable of the three-coordinate measuring machine, and then the workpiece measurement method is used for measurement.
The workpiece measuring method comprises the following steps:
acquiring initial measurement data of the workpiece to be measured, and establishing a target workpiece coordinate system according to the initial measurement data;
acquiring rotation measurement data of the workpiece to be measured rotating along with the turntable based on the target workpiece coordinate system, and establishing a first measurement coordinate system according to the rotation measurement data;
calculating to obtain a workpiece coordinate system correction matrix of the target workpiece coordinate system relative to the first measurement coordinate system;
acquiring a measurement coordinate system correction matrix according to a preset indexing angle of rotation of the turntable and the workpiece coordinate system correction matrix;
when the turntable enters a 1 st indexing window, acquiring actual measurement data of the workpiece to be measured based on the first measurement coordinate system;
when the turntable enters an Nth indexing window and N is more than or equal to 2, acquiring an Nth measurement coordinate system based on an N-1 th measurement coordinate system by adopting the measurement coordinate system correction matrix, and acquiring actual measurement data of the workpiece to be measured based on the Nth measurement coordinate system.
It should be noted that, when the workpiece to be measured is fixed on the turntable, the turntable is in the 1 st index window, and when the turntable rotates by a preset index angle, the turntable enters the next index window.
In the method, a workpiece coordinate system correction matrix for correcting the error is obtained according to the error of an axis between a workpiece to be measured and a turntable, and then a correction matrix for correcting a measured coordinate system after the turntable rotates is obtained through a preset indexing angle of the turntable and the workpiece coordinate system correction matrix. In actual measurement, when the turntable rotates once, the measurement coordinate system correction matrix is directly used for correction, so that a usable measurement coordinate system can be obtained, and complex calibration work for reestablishing the coordinate system is not needed.
Preferably, the step of obtaining initial measurement data of the workpiece to be measured and establishing a target workpiece coordinate system according to the initial measurement data includes:
acquiring M initial measurement data of the workpiece to be measured, and establishing an M workpiece coordinate system according to the M initial measurement data, wherein M is a positive integer;
acquiring M+1 initial measurement data of the workpiece to be measured based on the M-th workpiece coordinate system;
Establishing an M+1th workpiece coordinate system according to the M+1th initial measurement data;
determining the M+1th object coordinate system as the target object coordinate system;
the M+1th initial measurement data is greater than the number of first measuring points contained in the M initial measurement data, and the measurement accuracy of the M+1th workpiece coordinate system is greater than the measurement accuracy of the M workpiece coordinate system.
It should be noted that, in each process of establishing the coordinate system of the workpiece, the workpiece to be measured is stationary and different. At least one end face measuring point and at least one cylindrical measuring point are selected from the workpiece to be measured as first measuring points.
In the process of continuously iterating the workpiece coordinate system, the selected first measuring points are more and more dense. Therefore, the measurement accuracy of the established workpiece coordinate system can be improved based on more initial measurement data, and the target workpiece coordinate system with higher measurement accuracy can be obtained.
In this design, a target workpiece coordinate system may be established based on the one-time measurement result to determine the axis position of the workpiece to be measured. The denser first measuring points can be measured again on the basis of the first workpiece coordinate system so as to establish a more accurate target workpiece coordinate system.
Preferably, the step of obtaining rotation measurement data of the workpiece to be measured rotating along with the turntable based on the target workpiece coordinate system, and establishing a first measurement coordinate system according to the rotation measurement data includes:
acquiring the Kth rotation measurement data of a second measuring point when the workpiece to be measured rotates along with the turntable;
establishing a K-th turntable coordinate system according to the K-th rotation measurement data;
determining the Kth turntable coordinate system as a first measurement coordinate system;
acquiring the Kth rotation measurement data based on the target workpiece coordinate system when the K is equal to 1, and acquiring the Kth rotation measurement data based on a Kth-1 turntable coordinate system when the K is an integer greater than 1;
the measurement accuracy of the K+1th turntable coordinate system is greater than that of the K turntable coordinate system.
It should be noted that, in each process of establishing the turntable coordinate system, a pair of second measuring points is first selected from the workpiece to be measured, and then the positions of the second measuring points are continuously obtained in the process of rotating the workpiece to be measured along with the turntable. The second measuring point also needs to comprise an end face measuring point and a cylindrical surface measuring point of the workpiece to be measured.
The end surface measuring point and the cylindrical surface measuring point included in the first measuring point and the second measuring point are generally referred to as measuring points selected from the end surface of the workpiece to be measured and measuring points selected from the cylindrical surface of the workpiece to be measured, and are not necessarily referred to as identical measuring points.
In the design mode, the measurement data of the workpiece to be measured along with the rotation of the turntable can be directly obtained on the basis of the target workpiece coordinate system, a first turntable coordinate system is established, and the established first turntable coordinate system is directly used as the measurement coordinate system used when the turntable can be measured and positioned in the 1 st indexing window. The measurement data of the workpiece to be measured rotating along with the turntable can be acquired again on the basis of the first turntable coordinate system so as to establish a second turntable coordinate system. The K-th turntable coordinate system with more accurate detection precision is obtained through continuous iteration of the steps, and is determined to be a first measurement coordinate system.
Specifically, in one possible design manner of obtaining the kth rotation measurement data of the second measurement point when the workpiece to be measured rotates along with the turntable, the method includes:
when the K is equal to 1, acquiring first coordinate data of the second measuring point based on the target workpiece coordinate system;
when the K is larger than 1, acquiring first coordinate data of the second measuring point based on a K turntable coordinate system, wherein the second measuring point comprises a cylindrical measuring point and an end face measuring point;
acquiring second coordinate data to J+1th coordinate data of the second measuring point after the workpiece to be measured rotates 1 to J Kth preset rotation angles along with the turntable based on the first coordinate data of the second measuring point, wherein the Kth+1th preset rotation angle is smaller than the Kth preset rotation angle;
And forming the first coordinate data to the J+1th coordinate data into the Kth rotation measurement data, wherein J is a positive integer.
That is, the first coordinate data in each rotation measurement data is measured based on the previous existing coordinate system. And then measuring the coordinate data of the second measuring point once every time the turntable rotates by a preset rotation angle to obtain second coordinate data and third coordinate data … … (J+1) th coordinate data. The kth rotation measurement data is a set of first coordinate data to j+1th coordinate data.
In the process of acquiring the measurement data of each rotation, the preset rotation angle of the rotation of the turntable can be gradually reduced. On the basis of the former rotating table coordinate system, the second measuring points are measured more densely by a smaller preset rotating angle, so that more coordinate data of the second measuring points are obtained to form next rotating measurement data, and a next rotating table coordinate system with more accurate measurement accuracy is established.
Specifically, in one possible design manner of the j+1th coordinate data of the second measurement point, the j+1th coordinate data of the second measurement point is:
D J+1 ＝(D J-x ,D J-y cos(θ)-D J-z sin(θ),D J-y sin(θ)+D J-z cos(θ))，
wherein D is J-x 、D J-y 、D J-z Respectively representing an x-axis coordinate, a y-axis coordinate and a z-axis coordinate of the J-th coordinate data of the second measuring point, wherein θ represents the K-th preset rotation angle.
Preferably, the calculation formula corresponding to the measurement coordinate system correction matrix is as follows:
T′＝TR(α) -1 T -1 R(α)，
wherein T is the correction matrix of the workpiece coordinate system, and R (alpha) is the homogeneous pose matrix when the Nth measurement turntable calibration coordinate system is converted into the (n+1) th measurement turntable calibration coordinate system;
the workpiece coordinate system correction matrix T is as follows:
wherein R is a homogeneous pose matrix when the target workpiece coordinate system is converted into the first measurement coordinate system, and A is the axial number in the coordinate axis.
Preferably, the workpiece to be measured is a engine part to be measured.
Specifically, the engine parts to be tested are uniformly distributed in the circumferential direction after being assembled to the unit body. It can be fixed on the turntable, and the turntable is rotated according to a preset indexing angle to enter different indexing windows for measurement.
In a second aspect, the present application provides a workpiece measurement system based on a three-coordinate measuring machine, wherein a workpiece to be measured is fixed on a turntable of the three-coordinate measuring machine, and then the workpiece measurement system is used for measurement.
The workpiece measurement system includes:
the workpiece coordinate system establishing module is used for acquiring initial measurement data of the workpiece to be measured and establishing a target workpiece coordinate system according to the initial measurement data;
The measurement coordinate system establishing module is used for acquiring rotation measurement data of the workpiece to be measured rotating along with the turntable based on the target workpiece coordinate system, and establishing a first measurement coordinate system according to the rotation measurement data;
the workpiece coordinate system correction module is used for calculating and obtaining a workpiece coordinate system correction matrix of the target workpiece coordinate system relative to the first measurement coordinate system;
the measuring coordinate system correction module is used for obtaining a measuring coordinate system correction matrix according to the preset indexing angle of the rotation of the turntable and the workpiece coordinate system correction matrix;
the measuring module is used for acquiring actual measurement data of the workpiece to be measured based on the first measurement coordinate system when the turntable enters the 1 st indexing window; when the turntable enters an Nth indexing window and N is more than or equal to 2, acquiring an Nth measurement coordinate system based on an N-1 th measurement coordinate system by adopting the measurement coordinate system correction matrix, and acquiring actual measurement data of the workpiece to be measured based on the Nth measurement coordinate system.
It should be noted that, when the workpiece to be measured is fixed on the turntable, the turntable is in the 1 st index window, and when the turntable rotates by a preset index angle, the turntable enters the next index window.
In the method, a workpiece coordinate system correction matrix for correcting the error is obtained according to the error of an axis between a workpiece to be measured and a turntable, and then a correction matrix for correcting a measured coordinate system after the turntable rotates is obtained through a preset indexing angle of the turntable and the workpiece coordinate system correction matrix. In actual measurement, when the turntable rotates once, the measurement coordinate system correction matrix is directly used for correction, so that a usable measurement coordinate system can be obtained, and complex calibration work for reestablishing the coordinate system is not needed.
Preferably, the workpiece coordinate system establishment module includes:
the workpiece coordinate system establishing unit is used for acquiring the Mth initial measurement data of the workpiece to be measured and establishing an Mth workpiece coordinate system according to the Mth initial measurement data, wherein M is a positive integer;
a workpiece coordinate system measuring unit, configured to obtain m+1th initial measurement data of the workpiece to be measured based on the mth workpiece coordinate system;
the workpiece coordinate system iteration unit is used for establishing an M+1th workpiece coordinate system according to the M+1th initial measurement data;
a target object coordinate system determination unit configured to determine the m+1th object coordinate system as the target object coordinate system;
The M+1th initial measurement data is greater than the number of first measuring points contained in the M initial measurement data, and the measurement accuracy of the M+1th workpiece coordinate system is greater than the measurement accuracy of the M workpiece coordinate system.
It should be noted that, in each process of establishing the coordinate system of the workpiece, the workpiece to be measured is stationary and different. At least one end face measuring point and at least one cylindrical measuring point are selected from the workpiece to be measured as first measuring points.
In the process of continuously iterating the workpiece coordinate system, the selected first measuring points are more and more dense. Therefore, the measurement accuracy of the established workpiece coordinate system can be improved based on more initial measurement data, and the target workpiece coordinate system with higher measurement accuracy can be obtained.
In this design, a target workpiece coordinate system may be established based on the one-time measurement result to determine the axis position of the workpiece to be measured. The denser first measuring points can be measured again on the basis of the first workpiece coordinate system so as to establish a more accurate target workpiece coordinate system.
Preferably, the measurement coordinate system establishment module includes:
the rotation measuring unit is used for acquiring the Kth rotation measuring data of the second measuring point when the workpiece to be measured rotates along with the turntable; acquiring the Kth rotation measurement data based on the target workpiece coordinate system when the K is equal to 1, and acquiring the Kth rotation measurement data based on a Kth-1 turntable coordinate system when the K is an integer greater than 1;
The measurement coordinate system establishing unit is used for establishing a K-th turntable coordinate system according to the K-th rotation measurement data;
a measurement coordinate system determination unit configured to determine the kth turntable coordinate system as a first measurement coordinate system;
the measurement accuracy of the K+1th turntable coordinate system is greater than that of the K-th workpiece coordinate system.
It should be noted that, in each process of establishing the turntable coordinate system, a pair of second measuring points is first selected from the workpiece to be measured, and then the positions of the second measuring points are continuously obtained in the process of rotating the workpiece to be measured along with the turntable. The second measuring point also needs to comprise an end face measuring point and a cylindrical surface measuring point of the workpiece to be measured.
The end surface measuring point and the cylindrical surface measuring point included in the first measuring point and the second measuring point are generally referred to as measuring points selected from the end surface of the workpiece to be measured and measuring points selected from the cylindrical surface of the workpiece to be measured, and are not necessarily referred to as identical measuring points.
In the design mode, the measurement data of the workpiece to be measured along with the rotation of the turntable can be directly obtained on the basis of the target workpiece coordinate system, a first turntable coordinate system is established, and the established first turntable coordinate system is directly used as the measurement coordinate system used when the turntable can be measured and positioned in the 1 st indexing window. The measurement data of the workpiece to be measured rotating along with the turntable can be acquired again on the basis of the first turntable coordinate system so as to establish a second turntable coordinate system. The K-th turntable coordinate system with more accurate detection precision is obtained through continuous iteration of the steps, and is determined to be a first measurement coordinate system.
Specifically, the rotation measurement unit includes:
a second measuring point obtaining subunit, configured to obtain, when the K is equal to 1, first coordinate data of the second measuring point based on the target workpiece coordinate system; when the K is larger than 1, acquiring first coordinate data of the second measuring point based on a K-1 turntable coordinate system, wherein the second measuring point comprises a cylindrical measuring point and an end face measuring point;
the rotation measurement subunit is used for acquiring second coordinate data to J+1th coordinate data of the second measuring point after the workpiece to be measured rotates along with the turntable by 1 to J th preset rotation angles based on the first coordinate data of the second measuring point, wherein the K+1th preset rotation angle is smaller than the K preset rotation angle;
and the data statistics subunit is used for forming the first coordinate data to the J+1th coordinate data into the Kth rotation measurement data, wherein J is a positive integer.
That is, the first coordinate data in each rotation measurement data is measured based on the previous existing coordinate system. And then measuring the coordinate data of the second measuring point once every time the turntable rotates by a preset rotation angle to obtain second coordinate data and third coordinate data … … (J+1) th coordinate data. The kth rotation measurement data is a set of first coordinate data to j+1th coordinate data.
In the process of acquiring the measurement data of each rotation, the preset rotation angle of the rotation of the turntable can be gradually reduced. On the basis of the former rotating table coordinate system, the second measuring points are measured more densely by a smaller preset rotating angle, so that more coordinate data of the second measuring points are obtained to form next rotating measurement data, and a next rotating table coordinate system with more accurate measurement accuracy is established.
Specifically, in one possible design manner of the j+1th coordinate data of the second measurement point, the j+1th coordinate data of the second measurement point is:
D J+1 ＝(D J-x ,D J-y cos(θ)-D J-z sin(θ),D J-y sin(θ)+D J-z cos(θ))，
wherein D is J-x 、D I-y 、D I-z Respectively representing an x-axis coordinate, a y-axis coordinate and a z-axis coordinate of the J-th coordinate data of the second measuring point, wherein θ represents the K-th preset rotation angle.
Preferably, the calculation formula corresponding to the measurement coordinate system correction matrix is as follows:
T′＝TR(α) -1 T -1 R(α)，
wherein T is the correction matrix of the workpiece coordinate system, and R (alpha) is the homogeneous pose matrix when the Nth measurement turntable calibration coordinate system is converted into the (n+1) th measurement turntable calibration coordinate system;
the workpiece coordinate system correction matrix T is as follows:
wherein R is a homogeneous pose matrix when the target workpiece coordinate system is converted into the first measurement coordinate system, and A is the axial number in the coordinate axis.
Preferably, the workpiece to be measured is a engine part to be measured.
Specifically, the engine parts to be tested are uniformly distributed in the circumferential direction after being assembled to the unit body. It can be fixed on the turntable, and the turntable is rotated according to a preset indexing angle to enter different indexing windows for measurement.
In a third aspect, the present application provides an electronic device, including a touch screen, a memory, a processor, and a computer program stored on the memory and capable of running on the processor, where the processor implements the workpiece measurement method based on the three-coordinate measuring machine according to the first aspect and any one of possible design manners of the first aspect when executing the computer program.
In a fourth aspect, the present application provides a computer-readable storage medium, on which a computer program is stored, which when executed by a processor implements the workpiece measurement method based on a three-coordinate measuring machine according to the first aspect and any one of its possible design modes.
The invention has the positive progress effects that: by constructing a correction matrix between the workpiece coordinate system and the measurement coordinate system, the fact that the actual measurement data are aligned with the axes between the workpiece coordinate system and the measurement coordinate system is ensured, errors caused by manual misalignment can be reduced, and the detection precision of the workpiece to be detected is improved. In the actual measurement process, a first measurement coordinate system is determined firstly, and then a measurement coordinate system correction matrix is obtained according to a preset indexing angle of rotation of the turntable and a workpiece coordinate system correction matrix, so that after each rotation of the turntable, a next measurement coordinate system can be directly calculated based on a previous measurement coordinate system, actual measurement data of the turntable in a corresponding indexing window is measured based on each measurement coordinate system, the need of reconstructing the measurement coordinate system after each time the turntable enters the next indexing window can be avoided, and the detection efficiency of the three-coordinate measuring machine is improved.
Drawings
Fig. 1 is a flow chart of a workpiece measurement method based on a three-coordinate measuring machine according to embodiment 1 of the present application;
fig. 2 is a schematic structural diagram of a workpiece to be measured according to embodiment 1 of the present application;
FIG. 3 is a schematic view of the position of the first measurement point according to embodiment 1 of the present application;
FIG. 4 is a schematic view of the positions of the more dense first measurement points provided in embodiment 1 of the present application;
FIG. 5 is a schematic diagram of the position of the second measurement point according to embodiment 1 of the present application;
FIG. 6 is a schematic diagram of the position of the second measuring point provided in embodiment 1 of the present application after rotation of the turntable;
FIG. 7 is a schematic block diagram of a three-coordinate measuring machine-based workpiece measurement system according to embodiment 2 of the present application;
fig. 8 is a schematic structural diagram of an electronic device according to embodiment 3 of the present application.
Detailed Description
The invention is further illustrated by means of the following examples, which are not intended to limit the scope of the invention.
The terms "first" and "second" are used below for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present embodiment, unless otherwise specified, the meaning of "plurality" is two or more.
Example 1
The embodiment of the application provides a workpiece measuring method based on a three-coordinate measuring machine, wherein a workpiece to be measured is fixed on a turntable of the three-coordinate measuring machine, and the workpiece measuring method is used for measuring the workpiece to be measured.
In the embodiment of the present application, as shown in fig. 1, the method includes steps S1 to S5:
s1, acquiring initial measurement data of the workpiece to be measured, and establishing a target workpiece coordinate system according to the initial measurement data;
s2, acquiring rotation measurement data of the workpiece to be measured rotating along with the turntable based on the target workpiece coordinate system, and establishing a first measurement coordinate system according to the rotation measurement data;
s3, calculating to obtain a workpiece coordinate system correction matrix of the target workpiece coordinate system relative to the first measurement coordinate system;
s4, acquiring a measurement coordinate system correction matrix according to the preset indexing angle of the rotation of the turntable and the workpiece coordinate system correction matrix;
s5, when the turntable enters a 1 st indexing window, acquiring actual measurement data of the workpiece to be measured based on the first measurement coordinate system; when the turntable enters an Nth indexing window and N is more than or equal to 2, acquiring an Nth measurement coordinate system based on an N-1 th measurement coordinate system by adopting the measurement coordinate system correction matrix, and acquiring actual measurement data of the workpiece to be measured based on the Nth measurement coordinate system.
Illustratively, the workpiece to be tested is a engine part to be tested as shown in fig. 2, and the components assembled on the engine part to be tested are uniformly distributed in the circumferential direction. When the three-coordinate measuring machine measures the components on the workpiece to be measured, the turntable is required to rotate by a preset indexing angle so as to enter different indexing windows for measurement.
In step S1, in order to obtain a more accurate target object coordinate system, initial measurement data may be acquired again based on the first established object coordinate system to construct a new object coordinate system, and a plurality of iterations may be performed according to this step.
Specifically, step S1 includes:
acquiring M initial measurement data of the workpiece to be measured, and establishing an M workpiece coordinate system according to the M initial measurement data, wherein M is a positive integer;
acquiring M+1 initial measurement data of the workpiece to be measured based on the M-th workpiece coordinate system;
establishing an M+1th workpiece coordinate system according to the M+1th initial measurement data;
determining the M+1th object coordinate system as the target object coordinate system;
the M+1th initial measurement data is greater than the number of first measuring points contained in the M initial measurement data, and the measurement accuracy of the M+1th workpiece coordinate system is greater than the measurement accuracy of the M workpiece coordinate system.
For example, a first measuring point shown in fig. 3 is selected from a workpiece to be measured, first initial measurement data of the first measuring point of the workpiece to be measured is obtained, and a first workpiece coordinate system is established according to the first initial measurement data.
And selecting more first measuring points shown in fig. 4 from the workpiece to be measured, acquiring second initial measurement data of the first measuring points of the workpiece to be measured based on the first workpiece coordinate system, and establishing a second workpiece coordinate system according to the second initial measurement data.
And by analogy, obtaining an Mth workpiece coordinate system with better measurement precision, and determining the Mth workpiece coordinate system as a target workpiece coordinate system. In view of calibration accuracy and efficiency, m=2 can be generally determined to meet the corresponding demands.
The first measuring point comprises an end face measuring point and a cylindrical surface measuring point. In fig. 3 and 4, the points in "A-A" are cylindrical measurement points, and the points in "B-direction" are end-face measurement points.
In step S2, again in order to obtain a more accurate measurement coordinate system, rotation measurement data can be acquired again on the basis of the first established turntable coordinate system to construct a new measurement coordinate system, and a plurality of iterations can be performed according to this step.
Specifically, step S2 includes:
acquiring the Kth rotation measurement data of a second measuring point when the workpiece to be measured rotates along with the turntable;
Establishing a K-th turntable coordinate system according to the K-th rotation measurement data;
determining the Kth turntable coordinate system as a first measurement coordinate system;
acquiring the Kth rotation measurement data based on the target workpiece coordinate system when the K is equal to 1, and acquiring the Kth rotation measurement data based on a Kth-1 turntable coordinate system when the K is an integer greater than 1;
the measurement accuracy of the K+1th turntable coordinate system is greater than that of the K-th workpiece coordinate system.
Illustratively, a second measurement point is selected from the workpiece under test. First rotation measurement data of a second measuring point are acquired based on a target workpiece coordinate system before the turntable starts to rotate. A first turret coordinate system is established based on the first rotation measurement data.
Second rotational measurement data for the second measurement point is then acquired based on the first turret coordinate system. And establishing a second turntable coordinate system according to the second rotation measurement data.
And by analogy, obtaining a K-th turntable coordinate system with better measurement accuracy, and determining the K-th turntable coordinate system as a first measurement coordinate system.
The step of acquiring the Kth rotation measurement data of the second measuring point when the workpiece to be measured rotates along with the turntable specifically comprises the following steps:
when the K is equal to 1, acquiring first coordinate data of the second measuring point based on the target workpiece coordinate system;
When the K is larger than 1, acquiring first coordinate data of the second measuring point based on a K-1 turntable coordinate system, wherein the second measuring point comprises a cylindrical measuring point and an end face measuring point;
acquiring second coordinate data to J+1th coordinate data of the second measuring point after the workpiece to be measured rotates 1 to J Kth preset rotation angles along with the turntable based on the first coordinate data of the second measuring point, wherein the Kth+1th preset rotation angle is smaller than the Kth preset rotation angle;
and forming the first coordinate data to the J+1th coordinate data into the Kth rotation measurement data, wherein J is a positive integer.
Illustratively, a second station is selected from the workpiece to be measured as shown in FIG. 5.
In the case that the first turret coordinate system has not been established, first coordinate data of the second measuring point is acquired based on the target object coordinate system.
Then the turntable is rotated by a preset rotation angle, the position of a second measuring point on the workpiece to be measured is shown in fig. 6, and at the moment, second coordinate data of the second measuring point are obtained.
That is, the turntable is rotated by 1 to J preset rotation angles, and the second coordinate data to the j+1th coordinate data of the second measurement point can be obtained.
The first to the j+1th coordinate data may constitute first rotation measurement data of the second measurement point.
A first turret coordinate system is then established based on the first rotation measurement data. And acquiring first coordinate data to J+1th coordinate data of the second measuring point based on the first rotating table coordinate system to form second rotating measurement data of the second measuring point.
And so on, the Kth rotation measurement data of the second measuring point can be obtained.
In particular, the preset rotation angle may be gradually reduced in the process of acquiring measurement data for each rotation. This allows the second measurement of more coordinate data.
That is, the turntable is rotated by a first preset rotation angle each time when the first rotation measurement data is acquired. And when the second rotation measurement data are acquired, the turntable rotates by a second preset rotation angle each time. Wherein the second preset rotation angle is smaller than the first preset rotation angle.
And by analogy, when the Kth rotation measurement data is acquired, the turntable rotates for the Kth preset rotation angle every time. Wherein, the K+1th preset rotation angle is smaller than the K preset rotation angle.
The j+1 coordinate data of the second measurement point should be theoretically:
D J+1 ＝(D J-x ,D J-y cos(θ)-D J-z sin(θ),D J-y sin(θ)+D J-z cos(θ))，
wherein D is J-x 、D J-y 、D J-z Respectively representing an x-axis coordinate, a y-axis coordinate and a z-axis coordinate of the J-th coordinate data of the second measuring point, wherein θ represents the K-th preset rotation angle.
In step S3 and step S4, the calculation formula corresponding to the measurement coordinate system correction matrix is as follows:
T′＝TR(α) -1 T -1 R(α)，
wherein T is the correction matrix of the workpiece coordinate system, and R (alpha) is the homogeneous pose matrix when the Nth measurement turntable calibration coordinate system is converted into the (n+1) th measurement turntable calibration coordinate system;
the workpiece coordinate system correction matrix T is as follows:
wherein R is a homogeneous pose matrix when the target workpiece coordinate system is converted into the first measurement coordinate system, and A is the axial number in the coordinate axis.
By way of example, three-dimensional coordinate axes commonly used include the x-axis, the y-axis, and the z-axis, and thus the axial number is 3.
Example 2
The embodiment of the application provides a workpiece measurement system based on a three-coordinate measuring machine, wherein a workpiece to be measured is fixed on a turntable of the three-coordinate measuring machine, and the workpiece measurement system is used for measuring the workpiece to be measured.
In an embodiment of the present application, as shown in fig. 7, the system includes the following modules:
the workpiece coordinate system establishing module 51 is configured to obtain initial measurement data of the workpiece to be measured, and establish a target workpiece coordinate system according to the initial measurement data;
the measurement coordinate system establishing module 52 is configured to obtain rotation measurement data of the workpiece to be measured rotating with the turntable based on the target workpiece coordinate system, and establish a first measurement coordinate system according to the rotation measurement data;
A workpiece coordinate system correction module 53, configured to calculate a workpiece coordinate system correction matrix of the target workpiece coordinate system relative to the first measurement coordinate system;
the measurement coordinate system correction module 54 is configured to obtain a measurement coordinate system correction matrix according to the preset indexing angle of the rotation of the turntable and the workpiece coordinate system correction matrix;
a measurement module 55, configured to obtain actual measurement data of the workpiece to be measured based on the first measurement coordinate system when the turntable enters the 1 st index window; when the turntable enters an Nth indexing window and N is more than or equal to 2, acquiring an Nth measurement coordinate system based on an N-1 th measurement coordinate system by adopting the measurement coordinate system correction matrix, and acquiring actual measurement data of the workpiece to be measured based on the Nth measurement coordinate system. Illustratively, the workpiece to be tested is a engine part to be tested as shown in fig. 2, and the components assembled on the engine part to be tested are uniformly distributed in the circumferential direction. When the three-coordinate measuring machine measures the components on the workpiece to be measured, the turntable is required to rotate by a preset indexing angle so as to enter different indexing windows for measurement.
In the workpiece coordinate system establishment module 51, in order to obtain a more accurate target workpiece coordinate system, initial measurement data may be acquired again based on the first established workpiece coordinate system to construct a new workpiece coordinate system, and multiple iterations may be performed according to this step.
Specifically, the workpiece coordinate system establishment module 51 includes:
the workpiece coordinate system establishing unit is used for acquiring the Mth initial measurement data of the workpiece to be measured and establishing an Mth workpiece coordinate system according to the Mth initial measurement data, wherein M is a positive integer;
a workpiece coordinate system measuring unit, configured to obtain m+1th initial measurement data of the workpiece to be measured based on the mth workpiece coordinate system;
the workpiece coordinate system iteration unit is used for establishing an M+1th workpiece coordinate system according to the M+1th initial measurement data;
a target object coordinate system determination unit configured to determine the m+1th object coordinate system as the target object coordinate system;
the M+1th initial measurement data is greater than the number of first measuring points contained in the M initial measurement data, and the measurement accuracy of the M+1th workpiece coordinate system is greater than the measurement accuracy of the M workpiece coordinate system.
For example, a first measuring point shown in fig. 3 is selected from a workpiece to be measured, first initial measurement data of the first measuring point of the workpiece to be measured is obtained, and a first workpiece coordinate system is established according to the first initial measurement data.
And selecting more first measuring points shown in fig. 4 from the workpiece to be measured, acquiring second initial measurement data of the first measuring points of the workpiece to be measured based on the first workpiece coordinate system, and establishing a second workpiece coordinate system according to the second initial measurement data.
And by analogy, obtaining an Mth workpiece coordinate system with better measurement precision, and determining the Mth workpiece coordinate system as a target workpiece coordinate system.
The first measuring point comprises an end face measuring point and a cylindrical surface measuring point. In fig. 3 and 4, the points in "A-A" are cylindrical measurement points, and the points in "B-direction" are end-face measurement points.
In the measurement coordinate system establishing module 52, in order to obtain a more accurate measurement coordinate system, rotation measurement data can be acquired again based on the first established turntable coordinate system to construct a new measurement coordinate system, and multiple iterations can be performed according to the step.
Specifically, the measurement coordinate system creation module 52 includes:
the rotation measuring unit is used for acquiring the Kth rotation measuring data of the second measuring point when the workpiece to be measured rotates along with the turntable; acquiring the Kth rotation measurement data based on the target workpiece coordinate system when the K is equal to 1, and acquiring the Kth rotation measurement data based on a Kth-1 turntable coordinate system when the K is an integer greater than 1;
the measurement coordinate system establishing unit is used for establishing a K-th turntable coordinate system according to the K-th rotation measurement data;
a measurement coordinate system determination unit configured to determine the kth turntable coordinate system as a first measurement coordinate system;
The measurement accuracy of the K+1th turntable coordinate system is greater than that of the K-th workpiece coordinate system.
Illustratively, a second measurement point is selected from the workpiece under test. First rotation measurement data of a second measuring point are acquired based on a target workpiece coordinate system before the turntable starts to rotate. A first turret coordinate system is established based on the first rotation measurement data.
Second rotational measurement data for the second measurement point is then acquired based on the first turret coordinate system. And establishing a second turntable coordinate system according to the second rotation measurement data.
And by analogy, obtaining a K-th turntable coordinate system with better measurement accuracy, and determining the K-th turntable coordinate system as a first measurement coordinate system.
Wherein the rotation measuring unit includes:
when the K is equal to 1, acquiring first coordinate data of the second measuring point based on the target workpiece coordinate system;
a second measuring point obtaining subunit, configured to obtain, when the K is equal to 1, first coordinate data of the second measuring point based on the target workpiece coordinate system; when the K is larger than 1, acquiring first coordinate data of the second measuring point based on a K-1 turntable coordinate system, wherein the second measuring point comprises a cylindrical measuring point and an end face measuring point;
the rotation measurement subunit is used for acquiring second coordinate data to J+1th coordinate data of the second measuring point after the workpiece to be measured rotates along with the turntable by 1 to J th preset rotation angles based on the first coordinate data of the second measuring point, wherein the K+1th preset rotation angle is smaller than the K preset rotation angle;
And the data statistics subunit is used for forming the first coordinate data to the J+1th coordinate data into the Kth rotation measurement data, wherein J is a positive integer.
Illustratively, a second station is selected from the workpiece to be measured as shown in FIG. 5.
In the case that the first turret coordinate system has not been established, first coordinate data of the second measuring point is acquired based on the target object coordinate system.
Then the turntable is rotated by a preset rotation angle, the position of a second measuring point on the workpiece to be measured is shown in fig. 6, and at the moment, second coordinate data of the second measuring point are obtained.
That is, the turntable is rotated by 1 to J preset rotation angles, and the second coordinate data to the j+1th coordinate data of the second measurement point can be obtained.
The first to the j+1th coordinate data may constitute first rotation measurement data of the second measurement point.
A first turret coordinate system is then established based on the first rotation measurement data. And acquiring first coordinate data to J+1th coordinate data of the second measuring point based on the first rotating table coordinate system to form second rotating measurement data of the second measuring point.
And so on, the Kth rotation measurement data of the second measuring point can be obtained.
In particular, the preset rotation angle may be gradually reduced in the process of acquiring measurement data for each rotation. This allows the second measurement of more coordinate data.
That is, the turntable is rotated by a first preset rotation angle each time when the first rotation measurement data is acquired. And when the second rotation measurement data are acquired, the turntable rotates by a second preset rotation angle each time. Wherein the second preset rotation angle is smaller than the first preset rotation angle.
And by analogy, when the Kth rotation measurement data is acquired, the turntable rotates for the Kth preset rotation angle every time. Wherein, the K+1th preset rotation angle is smaller than the K preset rotation angle.
The j+1 coordinate data of the second measurement point should be theoretically:
D J+1 ＝(D J-x ,D J-y cos(θ)-D J-z sin(θ),D J-y sin(θ)+D J-z cos(θ))，
wherein D is J-x 、D J-y 、D J-z Respectively representing an x-axis coordinate, a y-axis coordinate and a z-axis coordinate of the J-th coordinate data of the second measuring point, wherein θ represents the K-th preset rotation angle.
In step S3 and step S4, the calculation formula corresponding to the measurement coordinate system correction matrix is as follows:
T′＝TR(α) -1 T -1 R(α)，
wherein T is the correction matrix of the workpiece coordinate system, and R (alpha) is the homogeneous pose matrix when the Nth measurement turntable calibration coordinate system is converted into the (n+1) th measurement turntable calibration coordinate system;
the workpiece coordinate system correction matrix T is as follows:
wherein R is a homogeneous pose matrix when the target workpiece coordinate system is converted into the first measurement coordinate system, and A is the axial number in the coordinate axis.
By way of example, three-dimensional coordinate axes commonly used include the x-axis, the y-axis, and the z-axis, and thus the axial number is 3.
Example 3
Fig. 8 is a schematic structural diagram of an electronic device according to embodiment 3 of the present invention. The electronic device includes a memory, a processor, and a computer program stored on the memory and executable on the processor, the processor implementing the three-coordinate measuring machine-based workpiece measurement method of embodiment 1 when executing the program. The electronic device 30 shown in fig. 8 is merely an example, and should not be construed as limiting the functionality and scope of use of embodiments of the present invention.
As shown in fig. 8, the electronic device 30 may be in the form of a general purpose computing device, which may be a server device, for example. Components of electronic device 30 may include, but are not limited to: the at least one processor 31, the at least one memory 32, a bus 33 connecting the different system components, including the memory 32 and the processor 31.
The bus 33 includes a data bus, an address bus, and a control bus.
Memory 32 may include volatile memory such as Random Access Memory (RAM) 321 and/or cache memory 322, and may further include Read Only Memory (ROM) 323.
Memory 32 may also include a program/utility 325 having a set (at least one) of program modules 324, such program modules 324 including, but not limited to: an operating system, one or more application programs, other program modules, and program data, each or some combination of which may include an implementation of a network environment.
The processor 31 executes a computer program stored in the memory 32 to thereby perform various functional applications and data processing such as the three-coordinate measuring machine-based workpiece measuring method of embodiment 1 of the present invention.
The electronic device 30 may also communicate with one or more external devices 34 (e.g., keyboard, pointing device, etc.). Such communication may be through an input/output (I/O) interface 35. Also, model-generating device 30 may also communicate with one or more networks, such as a Local Area Network (LAN), a Wide Area Network (WAN), and/or a public network, such as the internet, via network adapter 36. As shown in fig. 8, network adapter 36 communicates with the other modules of model-generating device 30 via bus 33. It should be appreciated that although not shown in the figures, other hardware and/or software modules may be used in connection with the model-generating device 30, including, but not limited to: microcode, device drivers, redundant processors, external disk drive arrays, RAID (disk array) systems, tape drives, data backup storage systems, and the like.
It should be noted that although several units/modules or sub-units/modules of an electronic device are mentioned in the above detailed description, such a division is merely exemplary and not mandatory. Indeed, the features and functionality of two or more units/modules described above may be embodied in one unit/module in accordance with embodiments of the present invention. Conversely, the features and functions of one unit/module described above may be further divided into ones that are embodied by a plurality of units/modules.
Example 4
The present embodiment provides a computer-readable storage medium having stored thereon a computer program which, when executed by a processor, implements the three-coordinate measuring machine-based workpiece measuring method of embodiment 1.
More specifically, among others, readable storage media may be employed including, but not limited to: portable disk, hard disk, random access memory, read only memory, erasable programmable read only memory, optical storage device, magnetic storage device, or any suitable combination of the foregoing.
In a possible embodiment, the invention can also be realized in the form of a program product comprising program code for causing a terminal device to carry out the three-coordinate measuring machine-based workpiece measuring method of embodiment 1 when the program product is run on the terminal device.
Wherein the program code for carrying out the invention may be written in any combination of one or more programming languages, the program code may be executed entirely on the user device, partially on the user device, as a stand-alone software package, partially on the user device, partially on a remote device or entirely on the remote device.
While specific embodiments of the present application have been described above, it will be appreciated by those skilled in the art that this is by way of example only, and the scope of the application is defined by the appended claims. Various changes and modifications to these embodiments may be made by those skilled in the art without departing from the principles and spirit of the application, but such changes and modifications fall within the scope of the application.
Claims (16)
1. A workpiece measurement method based on a three-coordinate measuring machine, characterized in that a workpiece to be measured is fixed on a turntable of the three-coordinate measuring machine, the workpiece measurement method comprising:
acquiring initial measurement data of the workpiece to be measured, and establishing a target workpiece coordinate system according to the initial measurement data;
acquiring rotation measurement data of the workpiece to be measured rotating along with the turntable based on the target workpiece coordinate system, and establishing a first measurement coordinate system according to the rotation measurement data;
Calculating to obtain a workpiece coordinate system correction matrix of the target workpiece coordinate system relative to the first measurement coordinate system;
acquiring a measurement coordinate system correction matrix according to a preset indexing angle of rotation of the turntable and the workpiece coordinate system correction matrix;
when the turntable enters a 1 st indexing window, acquiring actual measurement data of the workpiece to be measured based on the first measurement coordinate system;
when the turntable enters an Nth indexing window and N is more than or equal to 2, acquiring an Nth measurement coordinate system based on an N-1 th measurement coordinate system by adopting the measurement coordinate system correction matrix, and acquiring actual measurement data of the workpiece to be measured based on the Nth measurement coordinate system.
2. The method of claim 1, wherein the step of obtaining initial measurement data of the workpiece to be measured and establishing a target workpiece coordinate system based on the initial measurement data comprises:
acquiring M initial measurement data of the workpiece to be measured, and establishing an M workpiece coordinate system according to the M initial measurement data, wherein M is a positive integer;
acquiring M+1 initial measurement data of the workpiece to be measured based on the M-th workpiece coordinate system;
Establishing an M+1th workpiece coordinate system according to the M+1th initial measurement data;
determining the M+1th object coordinate system as the target object coordinate system;
the M+1th initial measurement data is greater than the number of first measuring points contained in the M initial measurement data, and the measurement accuracy of the M+1th workpiece coordinate system is greater than the measurement accuracy of the M workpiece coordinate system.
3. The method for measuring a workpiece based on a three-coordinate measuring machine according to claim 1, wherein the step of acquiring rotation measurement data of the workpiece to be measured rotating with the turntable based on the target workpiece coordinate system, and establishing a first measurement coordinate system based on the rotation measurement data comprises:
acquiring the Kth rotation measurement data of a second measuring point when the workpiece to be measured rotates along with the turntable;
establishing a K-th turntable coordinate system according to the K-th rotation measurement data;
determining the Kth turntable coordinate system as a first measurement coordinate system;
acquiring the Kth rotation measurement data based on the target workpiece coordinate system when the K is equal to 1, and acquiring the Kth rotation measurement data based on a Kth-1 turntable coordinate system when the K is an integer greater than 1;
The measurement accuracy of the K+1th turntable coordinate system is greater than that of the K-th workpiece coordinate system.
4. A method of measuring a workpiece on the basis of a three-coordinate measuring machine as defined in claim 3, wherein the step of acquiring kth rotation measurement data of a second measurement point when the workpiece to be measured rotates with the turntable comprises:
when the K is equal to 1, acquiring first coordinate data of the second measuring point based on the target workpiece coordinate system;
when the K is larger than 1, acquiring first coordinate data of the second measuring point based on a K-1 turntable coordinate system, wherein the second measuring point comprises a cylindrical measuring point and an end face measuring point;
acquiring second coordinate data to J+1th coordinate data of the second measuring point after the workpiece to be measured rotates 1 to J Kth preset rotation angles along with the turntable based on the first coordinate data of the second measuring point, wherein the Kth+1th preset rotation angle is smaller than the Kth preset rotation angle;
and forming the first coordinate data to the J+1th coordinate data into the Kth rotation measurement data, wherein J is a positive integer.
5. The method for measuring a workpiece based on a three-coordinate measuring machine according to claim 4, wherein the j+1 th coordinate data of the second measuring point is:
D J+1 ＝(D J-x ，D J-y cos(θ)-D J-z sin(θ)，D J-y sin(θ)+D J-z cos(θ))，
Wherein D is J-x 、D J-y 、D J-z Respectively representing an x-axis coordinate, a y-axis coordinate and a z-axis coordinate of the J-th coordinate data of the second measuring point, wherein θ represents the K-th preset rotation angle.
6. The workpiece measurement method based on the three-coordinate measuring machine according to claim 1, wherein the calculation formula corresponding to the measurement coordinate system correction matrix is as follows:
T′＝TR(α) -1 T -1 R(α)，
wherein T is the correction matrix of the workpiece coordinate system, and R (alpha) is the homogeneous pose matrix when the Nth measurement turntable calibration coordinate system is converted into the (n+1) th measurement turntable calibration coordinate system;
the workpiece coordinate system correction matrix T is as follows:
wherein R is a homogeneous pose matrix when the target workpiece coordinate system is converted into the first measurement coordinate system, and A is the axial number in the coordinate axis.
7. The method for measuring a workpiece based on a three-dimensional measuring instrument according to any one of claims 1 to 6, wherein the workpiece to be measured is a engine member to be measured.
8. A workpiece measurement system based on a three-coordinate measuring machine, wherein a workpiece to be measured is fixed on a turntable of the three-coordinate measuring machine, the workpiece measurement system comprising:
the workpiece coordinate system establishing module is used for acquiring initial measurement data of the workpiece to be measured and establishing a target workpiece coordinate system according to the initial measurement data;
The measurement coordinate system establishing module is used for acquiring rotation measurement data of the workpiece to be measured rotating along with the turntable based on the target workpiece coordinate system, and establishing a first measurement coordinate system according to the rotation measurement data;
the workpiece coordinate system correction module is used for calculating and obtaining a workpiece coordinate system correction matrix of the target workpiece coordinate system relative to the first measurement coordinate system;
the measuring coordinate system correction module is used for obtaining a measuring coordinate system correction matrix according to the preset indexing angle of the rotation of the turntable and the workpiece coordinate system correction matrix;
the measuring module is used for acquiring actual measurement data of the workpiece to be measured based on the first measurement coordinate system when the turntable enters the 1 st indexing window; when the turntable enters an Nth indexing window and N is more than or equal to 2, acquiring an Nth measurement coordinate system based on an N-1 th measurement coordinate system by adopting the measurement coordinate system correction matrix, and acquiring actual measurement data of the workpiece to be measured based on the Nth measurement coordinate system.
9. The three-coordinate measuring machine-based workpiece measurement system of claim 8, wherein the workpiece coordinate system establishment module comprises:
the workpiece coordinate system establishing unit is used for acquiring the Mth initial measurement data of the workpiece to be measured and establishing an Mth workpiece coordinate system according to the Mth initial measurement data, wherein M is a positive integer;
A workpiece coordinate system measuring unit, configured to obtain m+1th initial measurement data of the workpiece to be measured based on the mth workpiece coordinate system;
the workpiece coordinate system iteration unit is used for establishing an M+1th workpiece coordinate system according to the M+1th initial measurement data;
a target object coordinate system determination unit configured to determine the m+1th object coordinate system as the target object coordinate system;
the M+1th initial measurement data is greater than the number of first measuring points contained in the M initial measurement data, and the measurement accuracy of the M+1th workpiece coordinate system is greater than the measurement accuracy of the M workpiece coordinate system.
10. The three-coordinate measuring machine-based workpiece measurement system of claim 8, wherein the measurement coordinate system establishment module comprises:
the rotation measuring unit is used for acquiring the Kth rotation measuring data of the second measuring point when the workpiece to be measured rotates along with the turntable; acquiring the Kth rotation measurement data based on the target workpiece coordinate system when the K is equal to 1, and acquiring the Kth rotation measurement data based on a Kth-1 turntable coordinate system when the K is an integer greater than 1;
the measurement coordinate system establishing unit is used for establishing a K-th turntable coordinate system according to the K-th rotation measurement data;
A measurement coordinate system determination unit configured to determine the kth turntable coordinate system as a first measurement coordinate system;
the measurement accuracy of the K+1th turntable coordinate system is greater than that of the K-th workpiece coordinate system.
11. The three-coordinate measuring machine-based workpiece measurement system of claim 10, wherein the rotation measurement unit comprises:
a second measuring point obtaining subunit, configured to obtain, when the K is equal to 1, first coordinate data of the second measuring point based on the target workpiece coordinate system; when the K is larger than 1, acquiring first coordinate data of the second measuring point based on a K-1 turntable coordinate system, wherein the second measuring point comprises a cylindrical measuring point and an end face measuring point;
the rotation measurement subunit is used for acquiring second coordinate data to J+1th coordinate data of the second measuring point after the workpiece to be measured rotates along with the turntable by 1 to J th preset rotation angles based on the first coordinate data of the second measuring point, wherein the K+1th preset rotation angle is smaller than the K preset rotation angle;
and the data statistics subunit is used for forming the first coordinate data to the J+1th coordinate data into the Kth rotation measurement data, wherein J is a positive integer.
12. The three-coordinate measuring machine-based workpiece measurement system of claim 11, wherein the j+1 th coordinate data of the second measurement point is:
D J+1 ＝(D J-x ，D J-y cos(θ)-D J-z sin(θ)，D J-y sin(θ)+D J-z cos(θ))，
wherein D is J-x 、D J-y 、D J-z Respectively representing an x-axis coordinate, a y-axis coordinate and a z-axis coordinate of the J-th coordinate data of the second measuring point, wherein θ represents the K-th preset rotation angle.
13. The three-coordinate measuring machine-based workpiece measurement system of claim 8, wherein the measurement coordinate system correction matrix corresponds to the following calculation formula:
T′＝TR(α) -1 T -1 R(α)，
wherein T is the correction matrix of the workpiece coordinate system, and R (alpha) is the homogeneous pose matrix when the Nth measurement turntable calibration coordinate system is converted into the (n+1) th measurement turntable calibration coordinate system;
the workpiece coordinate system correction matrix T is as follows:
wherein R is a homogeneous pose matrix when the target workpiece coordinate system is converted into the first measurement coordinate system, and A is the axial number in the coordinate axis.
14. The three-coordinate measuring machine-based workpiece measurement system of any of claims 8-13, wherein the workpiece to be measured is a engine to be measured.
15. An electronic device comprising a touch screen, a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the processor implements the three-coordinate measuring machine-based workpiece measurement method of any of claims 1-7 when the computer program is executed by the processor.
16. A computer-readable storage medium, on which a computer program is stored, characterized in that the computer program, when being executed by a processor, implements the three-coordinate measuring machine-based workpiece measuring method according to any of claims 1-7.
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