CN104166373A - Online detecting method and system for numerical control machine tool machining error - Google Patents

Online detecting method and system for numerical control machine tool machining error Download PDF

Info

Publication number
CN104166373A
CN104166373A CN201410383243.8A CN201410383243A CN104166373A CN 104166373 A CN104166373 A CN 104166373A CN 201410383243 A CN201410383243 A CN 201410383243A CN 104166373 A CN104166373 A CN 104166373A
Authority
CN
China
Prior art keywords
error
cutter
machine tool
space
real
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201410383243.8A
Other languages
Chinese (zh)
Inventor
陈光胜
朱帅
李郝林
郑庆振
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
University of Shanghai for Science and Technology
Original Assignee
University of Shanghai for Science and Technology
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by University of Shanghai for Science and Technology filed Critical University of Shanghai for Science and Technology
Priority to CN201410383243.8A priority Critical patent/CN104166373A/en
Publication of CN104166373A publication Critical patent/CN104166373A/en
Pending legal-status Critical Current

Links

Abstract

The invention relates to an online detecting method and system for a numerical control machine tool machining error. The online detecting system comprises a feed system position feedback signal interface, an orthogonal signal counting collecting card and an industrial control computer. According to the system, a work program space track analyzing module of the industrial control computer is used for describing an ideal space track of a workpiece to be machined as an end-to-end space line segment. In the workpiece machining process, a multi-axis position feedback signal collecting module of the system synchronously collects and records the space positions of all feed shafts of a machine tool in the workpiece machining process, and accordingly the actual cutter track of the workpiece in the machining process is obtained. A real-time machining error analyzing module works out the space error of cutting points of a cutter in real time according to a space error mathematic model, and a real-time error display module displays an error in the form of graphs. The system can online monitor the machining error in the workpiece machining process, and is especially suitable for the occasion where the dynamic error is serious due to the high feed speed or the feed system nonlinearity friction error is large or other else.

Description

Numerical Control Machine Tool Machining Error online test method and system
Technical field
The present invention relates to a kind of Numerical Control Machine Tool Machining Error on-line detecting system and method, specifically a kind ofly according to NC machining program and feed system feedback signal, the mismachining tolerance of lathe is carried out to the online system and method detecting.
Background technology
Along with development of manufacturing, particularly the high speed development of Aeronautics and Astronautics, car industry, improves constantly the performance requirement of numerically-controlled machine, at a high speed, high precision is the important directions of Modern NC Machine Tool development.Machining precision is to evaluate the important indicator of numerically-controlled machine performance, but causes that the error that machine tool accuracy declines is various, can be divided on the whole semi-static error and dynamic error two classes.The former comprise error comprise geometric error (kinematic error), because lathe element is subject to distortion inaccuracy that load causes, because heat causes, the error that STRESS VARIATION causes occurs in machine tool structure.And dynamic error comprise error that the vibration of spindle motion error, machine tool structure causes,, the response characteristic of feed system or error (as the hysteresis of system, servo parameter do not mate etc.) that digital control system control performance causes,, the non-linear error causing of servo-drive system (as friction, opposite clearance error etc.).These errors depend on the present working environment of lathe.For high speed, high-precision lathe, the error causing due to the dynamic perfromance of servo-drive system, the dynamic errors such as frictional error that the nonlinear characteristic of moving component composition surface friction causes become the principal element that affects numerically-controlled machine machining precision, are the Main Ingredients and Appearances of machine tooling error.At present, the detection of this error particularly error-detecting in process is a difficult problem, has no corresponding error detecting system or instrument, and the error of actual process is detected, and then compensation improves machine finish, be also at a high speed, the inevitable demand of high precision machine tool.
At present, to the method for numerically-controlled machine accuracy detection, can be divided into two kinds of the direct method of measurement and the indirect methods of measurement.The former comprises pairing comparision based on sample, ruler, inclinometer and step gage etc., laser interferometer method, the inclinator that relies on terrestrial gravitation and the level meter method etc. that according to rectilinear propagation principle and the light wavelength of light, are reference, and these measuring methods are only suitable for the semi-static errors such as geometric error of lathe.Common indirect measurement method has normal disc method, ball bar method, planar grid encoder method, laser tracker method, ring of light silk thread instrument method, two bar methods etc., by error identification model, can obtain comprising the multiple error of partial dynamic error.As ball bar method makes lathe carry out circular motion with different speed of feed, can conveniently obtain the part static error of lathe and the dynamic non-match error of feed shaft, and can detect the non-linear frictional error causing of feed system friction.But these methods are can only be at lathe unloaded and to carry out under the specific operations such as the track of regulation or speed of feed, although can reflect precision and the processing characteristics of lathe, can not reflect the mismachining tolerance in the actual process of numerically-controlled machine.
In addition, though three coordinate measuring machine can obtain the final error of workpiece, test specimen is more time-consuming in installation, the adjustment of three coordinate measuring machine, and cost is higher, inefficiency.In addition, three coordinate measuring machine can not obtain the error of workpiece in process.Although indivedual high-grade Installing machine tools have in machine testing system, additional sensors need to be installed in machine tooling district, cause processing inconvenient, and test item is generally for fixing special shape, as the online roundness measurement of grinding machine, expensive, and can only be to roundness measurement, other processing is helpless, and versatility is poor.
Summary of the invention
The present invention will provide a kind of Numerical Control Machine Tool Machining Error online test method and system, the method and system are by the comparison to desirable cutter path and actual cutter path, can be to causing in process that dynamic error and the non-linear frictional error causing of feed system that machine finish declines detect in real time, predict the final mismachining tolerance of workpiece.
For achieving the above object, technical scheme of the present invention is: a kind of Numerical Control Machine Tool Machining Error online test method, comprise and by Industrial Control Computer, according to nc program, draw out the theory movement track of machine tooling cutter, during machine tool motion, by each feed shaft position feedback measuring-signal gathering, draw out machine tooling cutter actual motion track, by the difference of theory movement track and the machine tooling cutter actual motion track of machine tooling cutter, the final mismachining tolerance of prediction workpiece.
A kind of system of implementing Numerical Control Machine Tool Machining Error online test method, comprise feed system position feed back signal interface, orthogonal signal counting capture card, Industrial Control Computer, each feed shaft position feed back signal of numerically-controlled machine is by feed system position feed back signal interface input orthogonal signal counting capture card, orthogonal signal counting capture card is connected with Industrial Control Computer, and Industrial Control Computer comprises:
Multiaxis position feed back signal acquisition module: for synchronous acquisition and record workpiece in each feed shaft position data of process numerically-controlled machine, obtain actual cutter path in process;
Job sequence space tracking parsing module: nc program is read in, and the ideal space track of workpiece is described as to end to end space interpolation segment of curve, this ideal space track is the reference data of carrying out error-detecting;
Mismachining tolerance real-time analysis module: when multiaxis position feed back signal acquisition module collects each cutter rail point, this cutter rail space of points position and desirable machining locus are compared, calculate in real time the trajectory error of actual machining locus point;
The real-time display module of mismachining tolerance: the form at display screen with figure shows the cutter rail point of current collection, and quantitatively marks.
Mismachining tolerance real-time analysis module: for the cutter actual path being comprised of n discrete location points, its mismachining tolerance at this location point is defined as this point to the vertical range of nearest ideal trajectory line segment; The mismachining tolerance of all discrete points is obtained by geometric relationship.
The real-time display module of mismachining tolerance, the display interface of its display screen is divided into processing program code and shows selection district and error display district, wherein: described processing program code shows selects district, for the machining code section of selecting to analyze; Described error display district, shows in real time for machining locus error.
The invention has the beneficial effects as follows:
The present invention is by the comparison to desirable cutter path and actual cutter path, can be to causing in process that dynamic error and the non-linear frictional error causing of feed system that machine finish declines detect in real time, predict the final mismachining tolerance of workpiece.This detection system need not installed extra sensor at the machining area of lathe, only need be linked into by feed system position feed back signal interface the position feed back signal of lathe.By the calculating of error and the mode with real-time online that shows, complete, error-detecting expends time in few.This error detecting system can be applied to most of numerically-controlled machine, applied widely.By the determination and analysis to error in whole process, can also provide valid data and reliable basis to next step error compensation.
Accompanying drawing explanation
Fig. 1 is that Numerical Control Machine Tool Machining Error on-line detecting system forms schematic diagram;
Fig. 2 is online error real-time computing technique and flow chart of steps.
Embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in detail.
With reference to Fig. 1, a kind of Numerical Control Machine Tool Machining Error on-line detecting system, comprise feed system position feed back signal interface, orthogonal signal counting capture card, Industrial Control Computer, each feed shaft position feed back signal of numerically-controlled machine is by feed system position feed back signal interface input orthogonal signal counting capture card, and orthogonal signal counting capture card is connected with Industrial Control Computer.
Industrial Control Computer comprises multiaxis position feed back signal acquisition module, job sequence space tracking parsing module, mismachining tolerance real-time analysis module and the real-time display module of mismachining tolerance.
The online step detecting of Numerical Control Machine Tool Machining Error proposed by the invention is:
1) by NC machining program instruction code input digital control system;
2), according to processing program code instruction, draw out the theory movement track of machine tooling cutter;
3) by digital control system according to processing program code instruction controller bed motion;
4), in machine tool motion, gather each feed shaft position feed back signal of lathe;
5), by the measuring-signal of each coordinate axis, draw the figure of lathe process tool actual motion track;
6), according to the difference of cutter actual motion track in the cutter theory movement track of machine tooling and machine tooling, evaluate the error of machine tool processing workpiece.
Job sequence space tracking parsing module reads in the nc program of processing work, and ideal space track that will workpiece is described as end to end space interpolation segment of curve, and ideal space track is the reference data of carrying out error-detecting.
Position signalling synchronous acquisition module synchronous acquisition also records workpiece each feed shaft position of numerically-controlled machine in process.Before data acquisition, adjust data acquisition system (DAS) coordinate system identical with machine tooling coordinate system, guarantee that the actual cutter path that obtains process is consistent with the track of desirable cutter, does not need other coordinate transform.
System acquisition is to time each cutter rail point, mismachining tolerance real-time analysis module compares this space of points position and desirable machining locus, calculate in real time the trajectory error of the point on actual machining locus, for the cutter actual path being comprised of n discrete location points, establishing i discrete point is p i, coordinate is (x i, y i, z i), it is at the mismachining tolerance d of this location point ibe defined as this point to the vertical range of nearest ideal trajectory line segment, the mismachining tolerance of this discrete point is obtained by the geometric relationship of being correlated with.
If desirable interpolation curve is space line section, starting point (x s, y s, z s), terminal is (x e, y e, z e), the current data point collecting is (x i, y i, z i), current trajectory error is
Wherein
If desirable interpolation curve is circular arc, the center of circle (x o, y o, z o), radius R, current trajectory error becomes
Suppose that desirable cutter path is sequentially comprised of m bar interpolation curve, i bar interpolation curve L irepresent.Calculation procedure and the method for online processing on real-time error, as shown in Figure 2, be described in detail as follows:
1) when collection point is the 1st discrete point p 1time, general, the error d of this point 1should be this point to the 1st the interpolation curve L that forms ideal trajectory 1distance, now, remember that current interpolation curve is L 1;
2) when collection point is the 2nd discrete point p 2time, need to calculate P 2point is to current interpolation curve L 1vertical range D 2, calculate P simultaneously 2point is to next interpolation curve L 2vertical range D 2', if D 2<D 2', get d 2=D 2, current interpolation curve is still L 1, otherwise d 2=D 2', current interpolation curve becomes L 2;
3) in like manner, when collection point is p itime, need to calculate P ipoint is to current interpolation curve L jvertical range D iand P ipoint is to next interpolation curve L j+1vertical range D i', if D i<D i', get d i=D i, current interpolation curve is still L j, otherwise d i=D i', current interpolation curve becomes L j+1;
4) principle according to this, until image data finishes.
At display screen, the form with figure shows the cutter rail point of current collection to the real-time display module of error, and quantitatively marks.Display interface is divided into processing program code and shows that selection district and Liang great primary area, error display district form.In processing program code district, the machining code section by selecting to analyze, shows the machining locus error of this section in real time in error display district.The quantitative demonstration of error can color in accordance with regulations be indicated, or corresponding with position coordinates after error is amplified, and intuitively shows.

Claims (4)

1. a Numerical Control Machine Tool Machining Error online test method, comprise and by Industrial Control Computer, according to nc program, draw out the theory movement track of machine tooling cutter, during machine tool motion, by each feed shaft position feedback measuring-signal gathering, draw out machine tooling cutter actual motion track, it is characterized in that: by the difference of theory movement track and the machine tooling cutter actual motion track of machine tooling cutter, the final mismachining tolerance of prediction workpiece.
2. a system that implements the claims the Numerical Control Machine Tool Machining Error online test method described in 1, comprise feed system position feed back signal interface, orthogonal signal counting capture card, Industrial Control Computer, each feed shaft position feed back signal of numerically-controlled machine is by feed system position feed back signal interface input orthogonal signal counting capture card, orthogonal signal counting capture card is connected with Industrial Control Computer, it is characterized in that: described Industrial Control Computer comprises:
Multiaxis position feed back signal acquisition module: for synchronous acquisition and record workpiece in each feed shaft position data of process numerically-controlled machine, obtain actual cutter path in process;
Job sequence space tracking parsing module: nc program code is read in, and the ideal space track of workpiece is described as to end to end space interpolation segment of curve, this ideal space track is the reference data of carrying out error-detecting;
Mismachining tolerance real-time analysis module: when multiaxis position feed back signal acquisition module collects each cutter rail point, this cutter rail space of points position and desirable machining locus are compared, calculate in real time the trajectory error of actual machining locus point;
The real-time display module of mismachining tolerance: the form at display screen with figure shows the cutter rail point of current collection, and quantitatively marks.
3. Numerical Control Machine Tool Machining Error on-line detecting system according to claim 2, it is characterized in that: described mismachining tolerance real-time analysis module: for the cutter actual path being comprised of n discrete location points, its mismachining tolerance at this location point is defined as this point to the vertical range of nearest ideal trajectory line segment; The mismachining tolerance of all discrete points is obtained by geometric relationship.
4. according to the Numerical Control Machine Tool Machining Error on-line detecting system described in claim 2 or 3, it is characterized in that: the real-time display module of described mismachining tolerance, the display interface of its display screen is divided into processing program code and shows selection district and error display district, wherein: described processing program code shows selects district, for the machining code section of selecting to analyze; Described error display district, shows in real time for machining locus error.
CN201410383243.8A 2014-08-06 2014-08-06 Online detecting method and system for numerical control machine tool machining error Pending CN104166373A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201410383243.8A CN104166373A (en) 2014-08-06 2014-08-06 Online detecting method and system for numerical control machine tool machining error

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201410383243.8A CN104166373A (en) 2014-08-06 2014-08-06 Online detecting method and system for numerical control machine tool machining error

Publications (1)

Publication Number Publication Date
CN104166373A true CN104166373A (en) 2014-11-26

Family

ID=51910234

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201410383243.8A Pending CN104166373A (en) 2014-08-06 2014-08-06 Online detecting method and system for numerical control machine tool machining error

Country Status (1)

Country Link
CN (1) CN104166373A (en)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104772656A (en) * 2015-04-02 2015-07-15 西安交通大学 Online measuring system and method for rotary part of lathe
CN106774166A (en) * 2017-01-24 2017-05-31 西安科技大学 A kind of Digit Control Machine Tool frictional error form prediction and morphological feature parameter determination method
CN108942408A (en) * 2018-09-27 2018-12-07 上海气焊机厂有限公司 Part cutting deviation analytical equipment
CN110134069A (en) * 2019-05-08 2019-08-16 江苏金利宝电子科技有限公司 Numerically-controlled machine tool self-diagnosing method and system
CN111324977A (en) * 2018-11-28 2020-06-23 财团法人工业技术研究院 Cutting simulation method utilizing dynamic position error
CN111857051A (en) * 2019-04-25 2020-10-30 发那科株式会社 Waveform display device and waveform display method
CN112872909A (en) * 2021-01-12 2021-06-01 华中科技大学 Device and method for compensating dynamic contour error of machine tool
CN113741377A (en) * 2021-09-29 2021-12-03 上海理工大学 Machining process intelligent monitoring system and method based on cutting characteristic selection

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104772656A (en) * 2015-04-02 2015-07-15 西安交通大学 Online measuring system and method for rotary part of lathe
CN104772656B (en) * 2015-04-02 2017-04-26 西安交通大学 Online measuring system and method for rotary part of lathe
CN106774166A (en) * 2017-01-24 2017-05-31 西安科技大学 A kind of Digit Control Machine Tool frictional error form prediction and morphological feature parameter determination method
CN106774166B (en) * 2017-01-24 2019-04-12 西安科技大学 A kind of prediction of numerically-controlled machine tool frictional error form and morphological feature parameter determination method
CN108942408A (en) * 2018-09-27 2018-12-07 上海气焊机厂有限公司 Part cutting deviation analytical equipment
CN111324977A (en) * 2018-11-28 2020-06-23 财团法人工业技术研究院 Cutting simulation method utilizing dynamic position error
CN111324977B (en) * 2018-11-28 2023-05-30 财团法人工业技术研究院 Method for simulating cutting by using dynamic position error
CN111857051A (en) * 2019-04-25 2020-10-30 发那科株式会社 Waveform display device and waveform display method
CN110134069A (en) * 2019-05-08 2019-08-16 江苏金利宝电子科技有限公司 Numerically-controlled machine tool self-diagnosing method and system
CN110134069B (en) * 2019-05-08 2022-05-31 江苏金利宝电子科技有限公司 Self-diagnosis method and system of numerical control machine tool
CN112872909A (en) * 2021-01-12 2021-06-01 华中科技大学 Device and method for compensating dynamic contour error of machine tool
CN113741377A (en) * 2021-09-29 2021-12-03 上海理工大学 Machining process intelligent monitoring system and method based on cutting characteristic selection

Similar Documents

Publication Publication Date Title
CN104166373A (en) Online detecting method and system for numerical control machine tool machining error
Blaser et al. Adaptive learning control for thermal error compensation of 5-axis machine tools
US5111590A (en) Measuring method of machine tool accuracy using a computer aided kinematic transducer link and its apparatus
CN102854841B (en) Shape and position error in-situ compensating and processing method for curved surface parts
CN105269404B (en) Numerically-controlled machine tool point of a knife dynamic characteristic accuracy detecting device and its method
CN111215967B (en) Device and method for detecting dynamic precision of numerical control machine tool
CN109794805A (en) A kind of cone hole machine bus deviation automatic detection device and its detection method
CN204711699U (en) Digit Control Machine Tool point of a knife dynamic characteristic accuracy detecting device
CN103831669A (en) Circular degree error online measurement system and measurement method
CN202204481U (en) Gear chamfering laser gauge
CN103659467A (en) Method for calibrating axial prestroke of touch-type measuring head
CN102658503B (en) Modal testing method of numerical control machine tool feed system based on built-in sensors
Surkov Development of methods and means of coordinate measurements for linear and angular parameters of cutting instruments
CN102322819A (en) Gear chamfer laser measuring instrument
CN110977612B (en) CNC (computer numerical control) machining online measurement error correction method and system
JERZY et al. Calibration of 5 axis CNC machine tool with 3D quickSET measurement system.
CN111708323B (en) Five-axis small gantry numerical control machining center with thermal deformation error compensation function
CN109202539A (en) A kind of composite material weak separation polymorphic structure online test method
CN106796095B (en) Method for operating a coordinate measuring device, coordinate measuring device and computer program
Jiang et al. Evaluation of the dynamic performance for five-axis CNC machine tools based on RTCP
Liu et al. A line measurement method for geometric error measurement of the vertical machining center
CN106568398A (en) Swing axle revolution precision measure method of pivot angle head and similar type product
CN113134848A (en) Measurement mode based on six-axis robot repeated positioning precision
EP3101384B1 (en) Calibration method for calibrating the drive axis of a machine tool
Xiao et al. Swing Angle Error Compensation of a Computer Numerical Control Machining Center for Special-Shaped Rocks.

Legal Events

Date Code Title Description
C06 Publication
PB01 Publication
C10 Entry into substantive examination
SE01 Entry into force of request for substantive examination
RJ01 Rejection of invention patent application after publication

Application publication date: 20141126

RJ01 Rejection of invention patent application after publication