CN110977612A - CNC (computer numerical control) machining online measurement error correction method and system - Google Patents
CNC (computer numerical control) machining online measurement error correction method and system Download PDFInfo
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- CN110977612A CN110977612A CN201911130163.0A CN201911130163A CN110977612A CN 110977612 A CN110977612 A CN 110977612A CN 201911130163 A CN201911130163 A CN 201911130163A CN 110977612 A CN110977612 A CN 110977612A
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
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Abstract
The invention discloses a CNC (computer numerical control) machining online measurement error correction method and a CNC machining online measurement error correction system, which relate to the technical field of numerical control machine tool control and comprise the steps of setting at least two condition parameters which are in linear relation with a measurement error, and acquiring corresponding measurement coordinate values based on the at least two condition parameters; generating a coordinate generation curve according to at least two condition parameters and corresponding measurement coordinate values thereof; and calculating the measurement coordinate value under the specific condition parameter according to the coordinate generation curve. Compared with the operation mode that the error measurement correction needs frequent calibration in the prior art, the method of the invention does not need frequent calibration, and can obviously reduce the time needed by error measurement correction. Meanwhile, the method of the invention not only can measure the to-be-measured site in the two-dimensional plane, but also can measure and correct the to-be-measured site on the three-dimensional curved surface.
Description
Technical Field
The invention relates to the technical field of numerical control machining, in particular to a method and a system for correcting online measurement errors of CNC (computer numerical control) machining.
Background
Before a workpiece is machined by a numerical control machine tool, the precision of the movement of a tool of the machine tool needs to be measured and calibrated in order to ensure the machining precision.
In the prior art, a common method is to drive a measuring head to move by using a main shaft of a machine tool, and stop the movement of the measuring head immediately after the measuring head contacts a workpiece to be measured (such as a standard test piece). The whole process is as shown in fig. 1 a-1 c, theoretically, when the measuring head contacts with the measured workpiece, the inclination signal is immediately transmitted to the controller of the machine tool, and then the machine tool controller immediately outputs a control signal to control the main shaft to stop moving. Obviously, in practical applications, the transmission of the control signal needs a certain time, that is, within a certain time t after the probe contacts the measured object, the spindle of the machine tool still moves according to the original speed v, and the probe stops moving, which results in an inaccurate final test result of the measured object, and the measurement error epsilon of the process can be summarized as epsilon = t × v, and in the actual measurement, epsilon needs to be deleted from the test value.
The measurement error analysis is generated based on an ideal state, in actual production, the transmission time of the inclination signal and the machine tool control signal cannot be determined, the interference is closely related to the interference of the environment, such as the interference of temperature, humidity, electromagnetic field and other factors, and the interference is difficult to accurately stabilize. The sources of the measurement error include the response speed of the machine tool controller, the amount of friction force received by the stylus during rotation with the spindle, the amount of inertia moment generated by the stylus during movement, and the like, and the presence of the various uncertainties described above makes the measurement error difficult to determine, i.e., means that the accuracy of the machine tool machining is limited.
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Disclosure of Invention
The invention aims to provide an online measurement error correction method for CNC (computer numerical control) machining, which can improve the error measurement precision of a numerical control machine tool and expand the error measurement application range of a measured piece from a two-dimensional plane to a three-dimensional curved surface. Based on the method, the invention also aims to provide a CNC (computer numerical control) machining online measurement error correction system, which has the following specific scheme:
A CNC numerical control machining online measurement error correction method comprises the following steps:
Setting at least two condition parameters which are in linear relation with the measurement error, and acquiring corresponding measurement coordinate values based on the at least two condition parameters;
Generating a coordinate generation curve according to at least two condition parameters and corresponding measurement coordinate values thereof;
And calculating the measurement coordinate value under the specific condition parameter according to the coordinate generation curve.
According to the technical scheme, the condition parameters which are in linear relation with the measurement error are deduced, searched and identified according to theory, and the measurement coordinate values corresponding to the specific condition parameters can be calculated based on the condition parameters and at least two measured coordinate values.
Further, the method comprises:
Acquiring a first measurement coordinate value based on the first condition parameter;
Acquiring a second measurement coordinate value based on the second condition parameter;
Taking the first condition parameter and the second condition parameter as a horizontal axis, and the first measurement coordinate value and the second measurement coordinate value as a vertical axis, and generating a linear relation between the measurement coordinate values and the condition parameters in a two-dimensional coordinate;
And setting a third condition parameter according to the actual working condition, and generating a measurement coordinate value corresponding to the third condition parameter based on the linear relation.
Further, the calculating and acquiring the corresponding measurement coordinate value based on the at least two condition parameters includes:
Setting the movement speed of the machine tool spindle as the condition parameter;
Setting the moment when the measuring head contacts with the measured piece to stop moving the main shaft of the machine tool;
Setting a first measurement condition, wherein a first distance is formed between a machine tool main shaft and a measured piece at a first interval and the machine tool main shaft approaches the measured piece at a first speed;
Setting a second measurement condition, and enabling the machine tool main shaft and the measured piece to be spaced by a second distance and approach the measured piece at a second speed;
And after the main shaft of the machine tool stops moving, generating corresponding measurement coordinate values under the first measurement condition and the second measurement condition.
Further, the first speed is greater than the second speed;
The first distance is greater than the second distance.
Through the technical scheme, the time required by the second measurement can be effectively shortened, so that the whole time for measuring and correcting the error is shortened on the whole.
Further, it contacts the lathe main shaft stop motion in the moment of by survey head and measured piece to establish the gauge head, include:
Setting an incidence relation between a contact state of the measuring head and the measured piece and a position state of the measuring head;
The measuring head is rotatably connected with the machine tool spindle through a connecting rod, and the position state of the measuring head is set to be the deflection angle of the connecting rod;
And when the deflection angle is detected to be larger than a set value, judging that the measuring head is in contact with the measured piece.
Through the technical scheme, when the measuring head approaches to the measured piece from the horizontal direction, or the point position to be measured of the measured piece is a vertical surface or an inclined surface, the deflection angle of the connecting rod connected with the measuring head is taken as a reference to be used as a mark of the measured piece contacted with the measuring head, and the trigger is accurate and convenient to detect.
Further, it contacts the lathe main shaft stop motion in the moment of by survey head and measured piece to establish the gauge head, include:
Setting an incidence relation between a contact state of the measuring head and the measured piece and a position state of the measuring head;
The connecting rod connected with the measuring head is arranged in a telescopic manner, and the position state of the measuring head is set to be the telescopic length of the connecting rod;
And when the telescopic length is detected to be larger than a set value, judging that the measuring head is in contact with the measured piece.
Through the technical scheme, when the measuring head approaches to the measured part from the vertical direction or the point position to be measured of the measured part is a horizontal plane, the telescopic length of the connecting rod connected with the measuring head is taken as a reference to serve as a mark for the measured part to contact with the measuring head, and the trigger is accurate and convenient to detect.
Further, the method further comprises:
Automatically generating a machine tool spindle motion path, the first speed, the second speed, the first distance and the second distance according to the position coordinates of the measured point on the measured piece and the working condition requirements, and implementing the time interval between the first measurement condition and the second measurement condition
Through the technical scheme, the parameter condition of error measurement can be more reasonably optimized, the measurement time is shortened, and the measurement precision is improved.
In order to realize the online measurement error correction method for CNC (computerized numerical control) machining, the invention also provides an online measurement error correction system for CNC machining, which comprises the following steps:
The measuring implementation assembly comprises a measuring head connected with a machine tool main shaft, the measuring head is connected with the machine tool main shaft through a connecting rod, and a sensor device for detecting the position state of the measuring head is arranged in the machine tool or the measuring head and outputs a detection signal;
The measurement control assembly comprises a machine tool controller and a machine tool spindle driving device which is electrically connected with the machine tool controller and is used for controlling the motion state of the machine tool spindle, and the machine tool controller is in signal connection with the sensor device and receives and responds to the detection signal to control the action of the machine tool spindle;
And the data processing assembly comprises a data memory and a data processor, the data memory is in data connection with a data interface end of the machine tool controller, the data memory stores an algorithm program corresponding to the method, and stores operation control data and measurement coordinate data in the machine tool controller, and the data processor receives and generates measurement coordinate values under specific condition parameters according to the algorithm program based on the operation control data and the measurement coordinate data.
Furthermore, the connecting rod is rotatably connected with the machine tool spindle through a spherical hinge, the position state of the measuring head is set as the inclination angle of the connecting rod, and the sensor device comprises an optical signal sensor for detecting the inclination angle of the connecting rod; or
The connecting rod is the flexible setting of multistage, gauge head position state sets for the flexible length of connecting rod, the sensor device is including being used for detecting the distance sensor of connecting rod flexible length.
Through the technical scheme, the point to be measured on the measured piece can be measured in the X/Y/Z directions.
Compared with the prior art, the invention has the following beneficial effects:
Compared with the operation mode that the error measurement correction needs frequent calibration in the prior art, the method of the invention does not need frequent calibration, and can obviously reduce the time needed by error measurement correction. Meanwhile, the method of the invention not only can measure the to-be-measured site in the two-dimensional plane, but also can measure and correct the to-be-measured site on the three-dimensional curved surface.
Drawings
FIG. 1a is a schematic diagram of an overall functional framework of an error correction system (a measuring head moves towards a measured part);
FIG. 1b is a schematic diagram of the overall functional framework of the error correction system (the probe is in contact with the measured object);
FIG. 1c is a schematic diagram of the overall functional framework of the error correction system (the connecting rod creates an included angle);
FIG. 2 is a schematic flow chart of an error correction method according to the present invention;
FIG. 3 is a schematic flow chart of the error correction method of the present invention;
Fig. 4 is a schematic view of a method for calculating a measurement coordinate value in error correction.
Reference numerals: 1. a machine tool spindle; 2. a connecting rod; 3. a measuring head; 4. a machine tool controller; 5. a measured piece; 6. a probe signal receiver; 7. and (6) point location to be measured.
Detailed Description
Fig. 1 a-1 c are simplified diagrams illustrating the principle of error calibration of a numerically controlled machine tool in the prior art. Before describing the error correction method of the present invention in detail, the names of the respective functional components shown in fig. 1 and the relationship therebetween will be described.
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In terms of hardware configuration, a sensor device for detecting the inclination angle of the connecting rod 2 is disposed at the connection position of the connecting rod 2 and the machine tool spindle 1, or the inclination angle of the connecting rod 2 is detected by an optical/wireless signal detector disposed at the probe 3 or other position on the machine tool, when the inclination of the connecting rod 2 is detected, a corresponding inclination signal representing that the probe 3 is in contact with the measured object 5 is output to a probe signal receiver 6, and the probe signal receiver 6 transmits the inclination signal to a machine tool controller 4, typically a PLC control module. The machine tool controller 4 receives the inclination signal and outputs a control signal to control the machine tool spindle 1 driving device to stop moving.
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In the prior art, in order to reduce errors in the operation process of the machine tool spindle 1, calibration methods are often adopted for correction. Specifically, it can be summarized as follows:
A calibration step:
A. A standard ring gauge with reliable precision and known size is taken as a standard part.
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A measurement step:
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The conventional error correction method described above has disadvantages in that:
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For this purpose, the invention proposes a corresponding solution. The present invention will be described in further detail with reference to examples and drawings, but the present invention is not limited to these examples.
A CNC numerical control machining online measurement error correction method comprises the following steps:
Setting at least two condition parameters which are in linear relation with the measurement error, and acquiring corresponding measurement coordinate values based on the at least two condition parameters;
Generating a coordinate generation curve according to at least two condition parameters and corresponding measurement coordinate values thereof;
And calculating the measurement coordinate value under the specific condition parameter according to the coordinate generation curve.
The error measurement method does not need frequent calibration, can obtain a coordinate generation curve through at least two times of measurement, and finally inputs set condition parameters, such as the approaching speed of the measuring head 3 and the like, into the coordinate generation curve, so as to finally obtain the corresponding measurement coordinate value under the specific condition parameters. The measured coordinate values are both actual measurements and reasonable theoretical derivation (see the derivation above), so that the derived measured coordinate values are closer to the true values.
In detail, as shown in fig. 2, the method further includes:
Acquiring a first measurement coordinate value based on the first condition parameter;
Acquiring a second measurement coordinate value based on the second condition parameter;
Taking the first condition parameter and the second condition parameter as a horizontal axis, and the first measurement coordinate value and the second measurement coordinate value as a vertical axis, and generating a linear relation between the measurement coordinate values and the condition parameters in a two-dimensional coordinate;
And setting a third condition parameter according to the actual working condition, and generating a measurement coordinate value corresponding to the third condition parameter based on the linear relation.
According to the technical scheme, the measured coordinate value is directly used as the coordinate of a vertical axis, namely a Y axis, in the two-dimensional coordinate, and the set condition parameter is used as the coordinate of a horizontal axis, namely an X axis. The above arrangement can obtain the measurement error under the specific condition parameters very conveniently.
In an embodiment of the present invention, as a specific implementation manner, the acquiring the corresponding measurement coordinate values based on at least two condition parameters includes:
Setting the movement speed of the machine tool spindle 1 as the condition parameter;
Setting the moment that the measuring head 3 is contacted with the measured piece 5 and the machine tool main shaft 1 stops moving;
Setting a first measurement condition, wherein a first distance is formed between the machine tool spindle 1 and the measured piece 5, and the measured piece 5 approaches at a first speed;
Setting a second measurement condition, wherein a second distance is formed between the machine tool spindle 1 and the measured piece 5, and the measured piece 5 approaches at a second speed;
And after the machine tool spindle 1 stops moving, generating corresponding measurement coordinate values under the first measurement condition and the second measurement condition.
It should be noted that the above steps are not limited to the above sequential execution. The movement speed of the machine tool spindle 1 is set as the condition parameter by the above-described derivation, but in other embodiments, other parameters, such as the magnitude of the interaction force between the probe 3 and the workpiece 5, may be used as the condition parameter.
Since there is a linear relationship between the movement speed F of the machine tool spindle 1 and the measurement error, the number of the condition parameters may be 2 directly.
For example: as shown in fig. 4, the probe 3 approaches the workpiece 5 at speeds of F =300mm/min and F =100mm/min, respectively, and if the measurement coordinate value measured for the first time is (1.5, 1, 1) and the measurement coordinate value measured for the second time is (1.4, 1, 1), it can be inferred that when F =0mm/min, the measurement coordinate value measured should be (1.3, 1, 1), that is, the measurement coordinate value after the error is eliminated.
Preferably, in order to shorten the time of the measurement, the first speed is greater than the second speed, and the first distance is greater than the second distance. For example: as shown in fig. 1 a-1 c, the measuring head 3 moves toward the measured object 5 at a constant speed of 300mm/min under the first measuring condition, and the distance between the measuring head and the measured object is 150 mm; after the first measurement is finished, the machine tool spindle 1 does not directly return to the initial position, but returns 10mm along the original path, and then drives the measuring head 3 to move towards the measured piece 5 again at the speed of 100mm/min, and finally two times of measurement data are obtained. The advantage of the above-mentioned mode is that the roughly position of piece 5 under test can be known in the first measurement, and the measurement adopts short distance low-speed to approach for the second time, can accurately realize the measurement once more, shortens the time of measurement for the second time.
Based on the foregoing theoretical derivation analysis, and making full use of the hardware configuration in the prior art, further, the setting of the instant that the measuring head 3 contacts with the measured part 5 and the machine tool spindle 1 stops moving includes:
Setting a correlation relation between a contact state of the measuring head 3 and the measured piece 5 and a position state of the measuring head 3;
The measuring head 3 is rotatably connected with the machine tool spindle 1 through the connecting rod 2, and the position state of the measuring head 3 is set to be the deflection angle of the connecting rod 2;
And when the deflection angle is detected to be larger than a set value, judging that the measuring head 3 is in contact with the measured piece 5.
According to the scheme, when the measuring head 3 approaches the measured part 5 from the horizontal direction, or the point to be measured 7 of the measured part 5 is a vertical surface or an inclined surface, the deflection angle of the connecting rod 2 connected with the measuring head 3 is used as a reference to serve as a mark for the measured part 5 to contact with the measuring head 3, and the trigger is accurate and convenient to detect.
The association between the contact state of the probe 3 and the workpiece 5 and the position state of the probe 3 includes, but is not limited to, a control logic relationship.
In another embodiment, the stopping of the machine tool spindle 1 at the moment when the measuring head 3 is in contact with the measured object 5 includes:
Setting a correlation relation between a contact state of the measuring head 3 and the measured piece 5 and a position state of the measuring head 3;
The connecting rod 2 connected with the measuring head 3 is arranged in a telescopic manner, and the position state of the measuring head 3 is set to be the telescopic length of the connecting rod 2;
And when the telescopic length is detected to be larger than a set value, judging that the measuring head 3 is in contact with the measured piece 5.
In order to optimize parameter conditions of error measurement more reasonably, shorten measurement time and improve measurement precision, the method further comprises the following steps:
And automatically generating a movement path of the machine tool spindle 1, the first speed, the second speed, the first distance and the second distance according to the position coordinates of the measured point on the measured piece 5 and the working condition requirements, and implementing a time interval between the first measurement condition and the second measurement condition. In practical application, the steps can be realized by adopting automatic operation of a computer or calculated by using a set program in a cloud server.
In order to realize the online measurement error correction method for CNC (computerized numerical control) machining, the invention also provides an online measurement error correction system for CNC machining, which comprises the following steps:
The measuring implementation assembly comprises a measuring head 3 connected with a machine tool spindle 1, wherein the measuring head 3 is connected with the machine tool spindle 1 through a connecting rod 2, and a sensor device for detecting the position state of the measuring head 3 is arranged in the machine tool or the measuring head 3 and outputs a detection signal;
The measurement control assembly comprises a machine tool controller 4 and a machine tool spindle 1 driving device which is electrically connected with the machine tool controller 4 and is used for controlling the motion state of the machine tool spindle 1, wherein the machine tool controller 4 is in signal connection with the sensor device and receives and responds to the detection signal to control the action of the machine tool spindle 1;
And the data processing assembly comprises a data memory and a data processor, the data memory is in data connection with a data interface end of the machine tool controller 4, the data memory stores an algorithm program corresponding to the method, and stores operation control data and measurement coordinate data in the machine tool controller 4, and the data processor receives and generates measurement coordinate values under specific condition parameters according to the algorithm program based on the operation control data and the measurement coordinate data.
Further, the connecting rod 2 is rotatably connected with the machine tool spindle 1 through a spherical hinge, the position state of the measuring head 3 is set as the inclination angle of the connecting rod 2, and the sensor device comprises an optical signal sensor for detecting the inclination angle of the connecting rod 2; or the connecting rod 2 is arranged in a multi-section telescopic manner, the position state of the measuring head 3 is set to be the telescopic length of the connecting rod 2, and the sensor device comprises a distance sensor for detecting the telescopic length of the connecting rod 2.
The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and embellishments within the scope of the invention may occur to those skilled in the art without departing from the principle of the invention, and are considered to be within the scope of the invention.
Claims (9)
1. A CNC numerical control machining online measurement error correction method is characterized by comprising the following steps:
Setting at least two condition parameters which are in linear relation with the measurement error, and acquiring corresponding measurement coordinate values based on the at least two condition parameters;
Generating a coordinate generation curve according to at least two condition parameters and corresponding measurement coordinate values thereof;
And calculating the measurement coordinate value under the specific condition parameter according to the coordinate generation curve.
2. The method of claim 1, comprising:
Acquiring a first measurement coordinate value based on the first condition parameter;
Acquiring a second measurement coordinate value based on the second condition parameter;
Taking the first condition parameter and the second condition parameter as a horizontal axis, and the first measurement coordinate value and the second measurement coordinate value as a vertical axis, and generating a linear relation between the measurement coordinate values and the condition parameters in a two-dimensional coordinate;
And setting a third condition parameter according to the actual working condition, and generating a measurement coordinate value corresponding to the third condition parameter based on the linear relation.
3. The method of claim 2, wherein said obtaining corresponding measurement coordinate values based on at least two condition parameters comprises:
Setting the movement speed of the machine tool spindle (1) as the condition parameter;
Setting the moment when the measuring head (3) is contacted with the measured piece (5) and the machine tool main shaft (1) stops moving;
Setting a first measurement condition, wherein a first distance is formed between the machine tool spindle (1) and a measured piece (5) and the measured piece (5) approaches to the measured piece (5) at a first speed;
Setting a second measurement condition, wherein a second distance is formed between the machine tool spindle (1) and the measured piece (5) approaches to the measured piece (5) at a second speed;
And after the standby bed main shaft (1) stops moving, generating corresponding measurement coordinate values under the first measurement condition and the second measurement condition.
4. The method of claim 3,
The first speed is greater than the second speed;
The first distance is greater than the second distance.
5. A method according to claim 3, wherein the stopping of the movement of the machine spindle (1) at the moment of the contact between the measuring head (3) and the piece (5) to be measured comprises:
Setting a correlation relation between the contact state of the measuring head (3) and the measured piece (5) and the position state of the measuring head (3);
The measuring head (3) is rotatably connected with the machine tool spindle (1) through a connecting rod (2), and the position state of the measuring head (3) is set to be the deflection angle of the connecting rod (2);
And when the deflection angle is detected to be larger than a set value, judging that the measuring head (3) is in contact with the measured piece (5).
6. A method according to claim 3, wherein the stopping of the movement of the machine spindle (1) at the moment of the contact between the measuring head (3) and the piece (5) to be measured comprises:
Setting a correlation relation between the contact state of the measuring head (3) and the measured piece (5) and the position state of the measuring head (3);
The connecting rod (2) connected with the measuring head (3) is arranged in a telescopic manner, and the position state of the measuring head (3) is set to be the telescopic length of the connecting rod (2);
And when the telescopic length is detected to be larger than a set value, judging that the measuring head (3) is in contact with the measured piece (5).
7. The method of claim 4, further comprising:
And automatically generating a movement path of the machine tool spindle (1), the first speed, the second speed, the first distance and the second distance according to the position coordinates of the measured point on the measured piece (5) and the working condition requirements, and implementing a time interval between the first measurement condition and the second measurement condition.
8. The utility model provides a CNC numerical control processing on-line measurement error correction system which characterized in that includes:
The measurement implementation assembly comprises a measuring head (3) connected with a machine tool spindle (1), wherein the measuring head (3) is connected with the machine tool spindle (1) through a connecting rod (2), and a sensor device for detecting the position state of the measuring head (3) is arranged in the machine tool or the measuring head (3) and outputs a detection signal;
The measurement control assembly comprises a machine tool controller (4) and a machine tool spindle (1) driving device electrically connected with the machine tool controller and used for controlling the motion state of the machine tool spindle (1), wherein the machine tool controller (4) is in signal connection with the sensor device and receives and responds to the detection signal to control the action of the machine tool spindle (1);
Data processing assembly, comprising a data memory and a data processor, wherein the data memory is in data connection with the data interface end of the machine tool controller (4), the data memory stores an algorithm program corresponding to the method of any one of claims 1-6, and stores operation control data and measurement coordinate data in the machine tool controller (4), and the data processor receives and generates measurement coordinate values under specific condition parameters according to the algorithm program based on the operation control data and the measurement coordinate data.
9. The system according to claim 8, characterized in that the connecting rod (2) is rotatably connected with the machine tool spindle (1) through a ball hinge, the position state of the measuring head (3) is set to be the inclination angle of the connecting rod (2), and the sensor device comprises an optical signal sensor for detecting the inclination angle of the connecting rod (2); or
The connecting rod (2) is arranged in a multi-section telescopic mode, the position state of the measuring head (3) is set to be the telescopic length of the connecting rod (2), and the sensor device comprises a distance sensor used for detecting the telescopic length of the connecting rod (2).
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| CN111922782A (en) * | 2020-07-06 | 2020-11-13 | 杭州电子科技大学 | Method for detecting machine tool space error by using ball bar instrument constructed by ball hinge |
| CN114193231A (en) * | 2022-02-16 | 2022-03-18 | 成都飞机工业（集团）有限责任公司 | Bottom hole orifice measuring method for numerical control countersink |
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| CN206425903U (en) * | 2017-02-09 | 2017-08-22 | 河北工业大学 | A kind of workpiece probe error calibration device for vertical machining centre |
| CN106975983A (en) * | 2017-03-31 | 2017-07-25 | 河北工业大学 | A kind of method of testing for the hot position error of vertical machining centre linear axes |
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| CN111922782A (en) * | 2020-07-06 | 2020-11-13 | 杭州电子科技大学 | Method for detecting machine tool space error by using ball bar instrument constructed by ball hinge |
| CN114193231A (en) * | 2022-02-16 | 2022-03-18 | 成都飞机工业（集团）有限责任公司 | Bottom hole orifice measuring method for numerical control countersink |
| CN114193231B (en) * | 2022-02-16 | 2022-06-14 | 成都飞机工业（集团）有限责任公司 | Bottom hole orifice measuring method for numerical control countersink |
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