CN202010918U - Measuring device for torsional vibration mode of numerical control machine - Google Patents
Measuring device for torsional vibration mode of numerical control machine Download PDFInfo
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- CN202010918U CN202010918U CN2011200796713U CN201120079671U CN202010918U CN 202010918 U CN202010918 U CN 202010918U CN 2011200796713 U CN2011200796713 U CN 2011200796713U CN 201120079671 U CN201120079671 U CN 201120079671U CN 202010918 U CN202010918 U CN 202010918U
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Abstract
The utility model discloses a measuring device for numerical control machine in torsional vibration mode comprising a Hall sensor, a data acquisition card, two high resolution rotary encoders, a counter, a parameter identification module and a computer, wherein the Hall sensor is assembled on a power cord of a servo motor; the data acquisition card is installed in the computer and connected with the computer via a signal cable; the two high resolution rotary encoders are respectively arranged at the front end and the rear end of a ball-screw and connected with the counter via signal cables; the counter is connected with the computer via a signal wire; the parameter identification module is a computer software and installed in the computer. The measuring device can quickly and accurately measure the torsional vibration mode of a feed driving mechanism of the ball-screw of the numerical control machine, analyze the torsional dynamic characteristics and provide the design and the vibration control of the feed driving mechanism of the ball-screw with a scientific proof, thus applying to measuring the torsional vibration mode of the numerical control machine.
Description
Technical field
The utility model relates to Digit Control Machine Tool dynamic property measurement mechanism, particularly relates to the measurement mechanism of Digit Control Machine Tool torsion modes.
Background technology
High speed machining is one of most important common technology in the modern advanced manufacturing technique, and it has represented the developing direction of machining, and becomes the mainstream technology of machining gradually.High speed machining at first will have high-speed main spindle, and must being contained in structure, high-speed main spindle can adapt on the lathe of high-speed cutting, just can give full play to numerous advantages of high-speed cutting, this feed drive system that just requires lathe is in limited stroke, must possess very high acceleration, realize high feed speed.
At present the feed drive system of Digit Control Machine Tool adopts ball screw assembly, to drive more, ball screw assembly, drive be by leading screw-＞ball-＞complicated drive connection between the nut, rotatablely moving of motor converted to the rectilinear motion of workbench.In the transfer process of this motion, elongated leading screw can produce and reverse, the distortion of axial stretching and transverse curvature and vibration, and between ball and the raceway, also can produce mechanics phenomenons such as extruding and collision between ball and the ball.Under high speed, high acceleration unconventional operating modes such as (especially big displacement, heavy loads), the dynamic behavior that they caused will produce obviously influence to the crudy of lathe and efficient, and then the design of routine and control theory and method have been proposed new challenge.
In order to improve the control ability of high speed ball screw assembly, feed drive system machine finish, present research is Dynamic Modeling and the analysis of paying attention to mechanical driving part from the angle of Optimization of Mechanical Design on the one hand, to guarantee that frame for movement itself possesses at a high speed, the ability of high acceleration; And even be in SERVO CONTROL numerical control instruction, also to consider resonance or the microcosmic nonlinear kinetics behavior relevant more and more on the other hand, in the hope of realizing that high SERVO CONTROL bandwidth and the moving interpolation instruction that meets the Machine Tool Dynamics characteristic are satisfied at a high speed, the high acceleration requirement with malformation.At first, the dynamics of feeding driving mechanism has determined its moving component can produce distortion and vibration, this distortion and vibration are especially serious under big load, high acceleration condition, this just requires the feeding driving mechanism to have very high rigidity, and has distortion and vibration that rational structure causes to avoid or to reduce driving force.For example,, generally select great lead ball lead screw for use, in this case, can cause problems such as the increase of feeding driving mechanism load, rigidity deficiency and vibration aggravation in order to satisfy requirement at a high speed.Secondly, the high-speed numeric control lathe will be realized high feed speed and acceleration, and still has high positioning accuracy under high speed, needs its feed servo to drive and has high response, high accuracy and high stability.Yet the distortion of drive disk assembly and vibration can cause the control system instability, limit its control bandwidth.For widely used semiclosed loop ball-screw feed drive system on the present lathe, owing to be by being installed in rotary encoder on the motor shaft as position feedback, therefore, reversing dynamics is the principal element that influences controller stability, in the dynamical property analysis of drive disk assembly, must take into full account and reverse the influence of dynamic behavior, and then control system is effectively compensated control.But also lacking effective means at present accurately measures the torsion modes of Ball-screw in NC Machine Tools feeding driving mechanism.
Summary of the invention
The purpose of this utility model provides a kind of measurement mechanism of Digit Control Machine Tool torsion modes, can be fast and accurately measure the torsion modes of Ball-screw in NC Machine Tools feeding driving mechanism, analyze its torsional dynamics.
The utility model comprises Hall element, data collecting card, high resolution rotary encoder, counter, parameter identification module, computer;
Hall element is installed on the servo motor power supply line, and data collecting card is installed in the computer, and the two links to each other by signal cable, is used to measure the servomotor electric current;
Two high resolution rotary encoders are installed in the ball-screw front-end and back-end respectively, and they link to each other with counter by signal cable, and counter links to each other with computer by holding wire, are used to measure the angular velocity signal of ball-screw front-end and back-end;
The parameter identification module is a computer software, is installed in the computer, is used for motor current signal and ball-screw angular velocity signal are handled, and identifies the torsion mode parameter.
The utility model can be fast and is accurately measured the torsion modes of Ball-screw in NC Machine Tools feeding driving mechanism, analyzes its torsional dynamics, for the design and the vibration control of ball-screw feeding driving mechanism provides scientific basis.
Description of drawings
Accompanying drawing is the utility model measurement mechanism structural representation.
Among the figure: 1. numerical control device, 2. servo-driver, 3. data collecting card, 4. computer, 5. parameter identification module, 6. counter, 7. Hall element, 8. servomotor, 9. shaft coupling, 10. leading screw fore bearing, 11. high resolution rotary encoders, 12. guide rails, 13. ball-screw, 14. nut, 15. workbench, 16. leading screw rear bearings.
The specific embodiment
As shown in drawings, the Ball-screw in NC Machine Tools feed drive system that the utility model will be measured mainly comprises numerical control device 1, servo-driver 2, servomotor 8, shaft coupling 9, leading screw fore bearing 10, guide rail 12, ball-screw 13, nut 14, workbench 15, leading screw rear bearing 16.Measurement mechanism in the utility model comprises Hall element 7, data collecting card 3, high resolution rotary encoder 11, counter 6, parameter identification module 5, computer 4.Hall element 7 is installed on the servo motor power supply line, and data collecting card 3 is installed in the computer, and the two links to each other by signal cable.Two high resolution rotary encoders 11 are installed in the ball-screw front-end and back-end respectively, and they link to each other with counter 6 by signal cable, and counter 6 links to each other with computer 4 by holding wire.Parameter identification module 5 is a computer software, is installed in the computer 4.
The utility model utilizes numerical control device 1 to produce a series of sine waves with same-amplitude and change frequency, by being installed respectively in ball-screw 13 front-end and back-end, high accuracy rotary encoder 11 measures the angular velocity of rotation of ball-screw 13, and utilize Hall element 7 to measure the servomotor current signals and then obtain the driving torque of servomotor 8, sampling angular velocity signal and motor torque are made Fourier transform respectively and asked its ratio, obtain the transfer function between the measuring point on motor torque and the leading screw, utilize weighted least-squares method identification rotor-spindle arrangement torsion modes parameter at last, obtain twisting vibration each rank intrinsic frequency and Mode Shape.
Claims (1)
1. the measurement mechanism of a Digit Control Machine Tool torsion modes is characterized in that: Hall element (7), data collecting card (3), high resolution rotary encoder (11), counter (6), parameter identification module (5), computer (4); Hall element (7) is installed on the servo motor power supply line, and data collecting card (3) is installed in the computer (4), and the two links to each other by signal cable; Two high resolution rotary encoders (11) are installed in the ball-screw front-end and back-end respectively, and they link to each other with counter (6) by signal cable, and counter (6) links to each other with computer (4) by holding wire; Parameter identification module (5) is a computer software, is installed in the computer (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200796713U CN202010918U (en) | 2011-03-24 | 2011-03-24 | Measuring device for torsional vibration mode of numerical control machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200796713U CN202010918U (en) | 2011-03-24 | 2011-03-24 | Measuring device for torsional vibration mode of numerical control machine |
Publications (1)
| Publication Number | Publication Date |
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| CN202010918U true CN202010918U (en) | 2011-10-19 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2011200796713U Expired - Lifetime CN202010918U (en) | 2011-03-24 | 2011-03-24 | Measuring device for torsional vibration mode of numerical control machine |
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| CN (1) | CN202010918U (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102156033A (en) * | 2011-03-24 | 2011-08-17 | 武汉理工大学 | Measurement device and measurement method of torsional vibration modal of numerical control machine |
| CN102490087A (en) * | 2011-11-28 | 2012-06-13 | 武汉理工大学 | Device and method for measuring axial vibration of feed drive mechanism of numerical control machine |
| CN106041532A (en) * | 2016-06-02 | 2016-10-26 | 淮南市宜留机械科技有限公司 | Shock absorption assembly for drilling and milling machine |
| CN111221300A (en) * | 2018-11-26 | 2020-06-02 | 大隈株式会社 | Numerical control device |
| CN114829035A (en) * | 2019-11-06 | 2022-07-29 | 株式会社日本制钢所 | Abnormality detection device, abnormality detection method, and computer program |
-
2011
- 2011-03-24 CN CN2011200796713U patent/CN202010918U/en not_active Expired - Lifetime
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102156033A (en) * | 2011-03-24 | 2011-08-17 | 武汉理工大学 | Measurement device and measurement method of torsional vibration modal of numerical control machine |
| CN102156033B (en) * | 2011-03-24 | 2013-06-12 | 武汉理工大学 | Measurement device and measurement method of torsional vibration modal of numerical control machine |
| CN102490087A (en) * | 2011-11-28 | 2012-06-13 | 武汉理工大学 | Device and method for measuring axial vibration of feed drive mechanism of numerical control machine |
| CN102490087B (en) * | 2011-11-28 | 2013-12-25 | 武汉理工大学 | Device and method for measuring axial vibration of feed drive mechanism of numerical control machine |
| CN106041532A (en) * | 2016-06-02 | 2016-10-26 | 淮南市宜留机械科技有限公司 | Shock absorption assembly for drilling and milling machine |
| CN111221300A (en) * | 2018-11-26 | 2020-06-02 | 大隈株式会社 | Numerical control device |
| CN111221300B (en) * | 2018-11-26 | 2024-05-28 | 大隈株式会社 | Numerical control device |
| CN114829035A (en) * | 2019-11-06 | 2022-07-29 | 株式会社日本制钢所 | Abnormality detection device, abnormality detection method, and computer program |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20111019 Effective date of abandoning: 20130612 |
|
| RGAV | Abandon patent right to avoid regrant |