CN102806495B - Method for measuring dynamic rigidity of numerically-controlled machine tool - Google Patents
Method for measuring dynamic rigidity of numerically-controlled machine tool Download PDFInfo
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- CN102806495B CN102806495B CN201210282368.2A CN201210282368A CN102806495B CN 102806495 B CN102806495 B CN 102806495B CN 201210282368 A CN201210282368 A CN 201210282368A CN 102806495 B CN102806495 B CN 102806495B
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Abstract
The invention discloses a method for measuring the dynamic rigidity of a numerically-controlled machine tool, and belongs to the field of testing of performance of equipment. The method includes electrically connecting the numerically-controlled machine tool, a servo motor, a servo amplifier, a numerical control system and an electronic hand wheel according to a conventional method at first, selecting a shaft to be measured, and then rocking the electronic hand wheel to control the servo motor to drive the selected shaft to move; stopping a vibration suppression function of the servo amplifier; setting a unified position loop gain according to a recommended value range of the numerically-controlled machine tool; setting a position loop gain according to conventional experience to guarantee that a machine body does not vibrate when running in an initial test state; driving the machine tool to reciprocate by the electronic hand wheel, sequentially increasing a set value of the position loop gain until the tested shaft obviously vibrates or generates squealing sound; and recording set values of parameters of the position loop gain when the machine tool stops reciprocating. The method is simple and practical, and can be used for evaluating the rigidity of the machine tool, judging the quality of batch production and screening machine tools.
Description
Technical field:
The present invention relates to a kind of assay method of dynamic rigidity of numerically-controllmachine machine tool, it belongs to machining construction equipment technical field, particularly to equipment performance field tests.
Background technology:
The rigidity of Digit Control Machine Tool has larger impact to the performance of lathe and the mach effect of examination, therefore, is using the initial of Digit Control Machine Tool, and the rigidity assessment for Digit Control Machine Tool must be carried out.At present, be difficult to carry out measuring to the rigidity of lathe and assess by General Instrument equipment.In order to evaluate the rigidity of Digit Control Machine Tool, prior art is by carrying out synthetic determination to the knife mark after test specimen processing and fineness etc. to Digit Control Machine Tool rigidity, the method is used for the assessment of lathe rigidity following defect: first, affect a lot of because have of digital control processing surface quality, being difficult to determine that lathe rigidity produces affects size.Secondly, machined surface quality is normally judged by human eye, and different personnel judge variant; Cannot be described by data, result is judged that impact there are differences.Finally, Digit Control Machine Tool adds and usually adopts three-shaft linkage man-hour, cannot be appeared on which axle if there is processing is abnormal by workpiece decision problem.
Existing Digit Control Machine Tool is substantially all provided with servo amplifier, and the servo amplifier of Digit Control Machine Tool all has Gain tuning function, and when lathe does not shake, the size of highest-gain reflects the rigidity of lathe.Servo amplifier also has vibration suppression function, and the vibration that usually will be caused by the defect of vibration filter function to Machine Tool design and production during setting is made up, and lathe still can realize higher gain and set.But adopt servo amplifier to carry out vibration suppression not eradicate the defect that Machine Tool design and production cause, these defects still can produce harmful effect to the operation of Digit Control Machine Tool and processing.Therefore, still must assess the rigidity of Digit Control Machine Tool.
Summary of the invention:
The object of the present invention is to provide a kind of simple to operate, it is convenient to measure, and provides the assay method of the dynamic rigidity of numerically-controllmachine machine tool of accurate parameter can to the assessment of the rigidity of Digit Control Machine Tool.
The object of the present invention is achieved like this:
An assay method for dynamic rigidity of numerically-controllmachine machine tool, it comprises following step:
A: first by Digit Control Machine Tool, servomotor, servo amplifier, digital control system with the electronic hand wheel that servomotor drives corresponding axle to carry out moving can be controlled be electrically connected in a conventional manner, and described servo amplifier 5 is connected to determined axle 3 place by wire, electronic hand wheel 7 is connected to digital control system, debugging is normal, and the selected axle that will carry out measuring, then shake electronic hand wheel control servomotor and drive selected axle to move;
B: setting can the relevant parameter of filtering vibration of shutdown amplifier, and regulates servo amplifier parameter by the panel of digital control system, and the vibration suppression function of servo amplifier is closed;
C: according to the recommendation number range of Digit Control Machine Tool, the unified position loop gain of setting; Again according to standard empirical, set one and guarantee that fuselage runs the position loop gain not occurring to shake when testing original state;
D: use electronic hand wheel to drive lathe to move reciprocatingly, its stroke range is the stroke range of Digit Control Machine Tool; If lathe normal operation, tested dead axle does not produce and obviously vibrates or utter long and high-pitched sounds, and just increases the setting value of position loop gain, continues to move reciprocatingly after increase; The reciprocating motion of lathe and the setting value increasing position loop gain hocket, and the amplitude that described setting value increases at every turn tapers off form; Repeat said procedure, till tested dead axle produces obviously vibration or howling;
E: record lathe moves back and forth the setting value of position loop gain parameter when stopping, this value is exactly measured without speed gain value during filtering, uses self dynamic stiffiness of this value to lathe to assess in a conventional manner.
In described D step, the amplitude that the setting value of described position loop gain increases at every turn is 10 ~ 3, and taper off form.
The present invention is the partial devices utilized in existing equipment, by forbidding that vibration suppression function uses, when the gain of fixed speed ring, measure without maximum position ring yield value during filtering, now the size of gain set-point just directly reflects the motion rigidity that tested dead axle self is intrinsic, and this numerical value can be used for the dynamic stiffiness judging lathe.This invention can carry out independent measurement to each axle of lathe, quantitatively assesses the rigidity of each axle.This present invention is simple, practical, can be used for the rigidity assessment of lathe and the quality judging of mass production and screening.
Accompanying drawing illustrates:
Fig. 1 is the connection diagram of use equipment of the present invention
Detailed description of the invention:
Method of the present invention is foundation: by forbidding that vibration suppression function uses, and when the gain of fixed speed ring, measures without maximum position ring yield value during filtering.Now the size of gain set-point just directly reflects the motion rigidity that this axle self is intrinsic, and the theory that this numerical value can be used for the dynamic stiffiness judging lathe designs.Therefore by forbidding that the use of vibration suppression function is important means of the present invention, the vibration filter function of servo amplifier is namely closed.Close the vibration filter function of servo amplifier according to different servo-drive systems, the parameter of its required setting is also different, but the mode of setting is unified, and method is also method conventional in prior art.Select two kinds of servo-drive systems below, the present invention be further detailed:
Embodiment 1, adopts Fa Kena servo-drive system:
In the present embodiment, Digit Control Machine Tool, servomotor, servo amplifier, digital control system and the electronic hand wheel that servomotor drives corresponding axle to carry out moving can be controlled be common equipment of the prior art, Digit Control Machine Tool 1, servomotor 2, servo amplifier 5, digital control system 6 electric connecting mode is conveniently connected, and described servo amplifier 5 is connected to determined axle 3 place by wire 4, electronic hand wheel 7 is connected to digital control system, then shakes electronic hand wheel and drives selected axle to move by digital control system control servomotor.
In order to close the vibration filter function of servo amplifier, first by the function of the panel of digital control system setting servo amplifier parameter, the trap of wave filter 1 is eliminated in setting: the attenuation bandwidth of wave filter 1 is eliminated in the centre frequency of bandpass filter: #2113=0, vibration: #2177=0, vibration: the centre frequency of wave filter 2 is eliminated in #2359=0, vibration: the attenuation bandwidth of wave filter 2 is eliminated in #2360=0, vibration: the trap of wave filter 2 is eliminated in #2361=0, vibration: #2362=0; Then complete the setting of above-mentioned relevant parameter, the vibration suppression functions such as the filtering of amplifier can be made invalid, namely close the vibrations inhibit feature of servo amplifier;
After closing the vibrations inhibit feature of servo amplifier, the unified position loop gain of setting: this position loop gain has recommendation or the empirical value according to practice summary usually, here require it is fixedly because the adjustment of this parameter can have certain influence to the result of experiment, therefore require measuring speed ring gain under the condition of unified position loop gain.In the present embodiment, desired location ring gain: #1825=4000; The setting of this numerical value is only required in recommendation or empirical value selected.
Set lower speed ring gain.Because mensuration of the present invention is exactly in fact measuring vibrations and the speed ring yield value of the critical condition do not shaken; the process measured also is first guarantee that lathe does not shake; increase setting gradually until vibration; lower gain runs when referring to and guarantee fuselage test original state and does not shake; namely according to standard empirical; set one and guarantee that fuselage runs the position loop gain not occurring to shake when testing original state; i.e. measuring vibrations and the speed ring yield value of critical condition do not shaken, if the Fa Nake system speed ring gain of the present embodiment: #2021=100.
After setting above-mentioned parameter value, use electronic hand wheel to drive lathe to move reciprocatingly, its stroke range is the stroke range of Digit Control Machine Tool; If lathe normal operation, tested dead axle does not produce and obviously vibrates or utter long and high-pitched sounds, and just increases the setting value of position loop gain, continues to move reciprocatingly after increase; The reciprocating motion of lathe and the setting value increasing position loop gain hocket, and the amplitude that described setting value increases at every turn tapers off form; Repeat said procedure, till tested dead axle produces obviously vibration or howling.In this step, the amplitude that the setting value of described position loop gain increases at every turn is 10 ~ 3, and taper off form.Such as, first time increases by 10, and second time increases by 7, and third time increases the 5, four time and increases by 3.Because reciprocal time is more, more may faster close to the generation of vibrational state, so the numerical value that each position loop gain increases needs to successively decrease, to make the data that measure more accurate, fast.If once adopt the amplitude increased excessive, there will be hypercorrect phenomenon, namely there is very large vibration suddenly, so just need to reduce increase position loop gain again, make the process of the many one replication of mensuration work, cause waste.
When lathe move back and forth be stopped time, the setting value of record position ring gain parameter, this value is exactly measured without speed gain value during filtering, uses self dynamic stiffiness of this value to lathe to assess in a conventional manner.
Embodiment 2, adopts Mitsubishi's servo-drive system:
In the present invention, adopting different servo-drive systems, is only different with parameter during speed ring gain with the gain of desired location ring at the vibration filter function of setting closedown servo amplifier.When selecting Mitsubishi's servo-drive system, as long as close vibration filter function setting filter frequency number 1:#2238=0, the filter frequency number 2:#2246=0 of servo amplifier; Desired location ring gain #2203=33; Speed ring gain #2205=30.
Other parts of the present embodiment are identical with embodiment 1.
Claims (2)
1. an assay method for dynamic rigidity of numerically-controllmachine machine tool, is characterized in that it comprises following
Step:
A: first by Digit Control Machine Tool, servomotor, servo amplifier, digital control system with the electronic hand wheel that servomotor drives corresponding axle to carry out moving can be controlled be electrically connected in a conventional manner, and described servo amplifier (5) is connected to determined axle (3) place by wire, electronic hand wheel (7) is connected to digital control system, debugging is normal, and the selected axle that will carry out measuring, then shake electronic hand wheel control servomotor and drive selected axle to move;
B: setting can shutdown amplifier filtering vibration relevant parameter, namely the trap of wave filter is eliminated in the centre frequency of bandpass filter, the attenuation bandwidth of vibration elimination wave filter and vibration, and regulate servo amplifier parameter by the panel of digital control system, the vibration suppression function of servo amplifier is closed;
C: according to the recommendation number range of Digit Control Machine Tool, the unified position loop gain of setting; Again according to standard empirical, set one and guarantee that fuselage runs the position loop gain not occurring to vibrate when testing original state;
D: use electronic hand wheel to drive lathe to move reciprocatingly, its stroke range is the stroke range of Digit Control Machine Tool; If lathe normal operation, tested dead axle does not produce and obviously vibrates or utter long and high-pitched sounds, and just increases the setting value of position loop gain, continues to move reciprocatingly after increase; The reciprocating motion of lathe and the setting value increasing position loop gain hocket, and the amplitude that described setting value increases at every turn tapers off form; Repeat D step procedure, till tested dead axle produces obviously vibration or howling;
E: record lathe moves back and forth the setting value of position loop gain parameter when stopping, this value is exactly measured without speed gain value during filtering, uses self dynamic stiffiness of this value to lathe to assess in a conventional manner.
2. the assay method of dynamic rigidity of numerically-controllmachine machine tool as described in claim 1, it is characterized in that in described D step, the amplitude that the setting value of described position loop gain increases at every turn is 10 ~ 3, and taper off form.
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| CN108615109A (en) * | 2018-04-19 | 2018-10-02 | 北京信息科技大学 | A kind of NC Machine Quality method of evaluating performance Internet-based |
| CN113960960B (en) * | 2021-12-22 | 2022-03-18 | 沈阳机床(集团)有限责任公司 | Method for testing and analyzing rigidity of semi-closed loop servo feeding system of numerical control machine tool |
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| US5239886A (en) * | 1992-08-03 | 1993-08-31 | Cincinnati Milacron Inc. | Stability high gain and dynamic stiffness servo axis drive system and method |
| CN2703290Y (en) * | 2004-06-04 | 2005-06-01 | 南京工业大学 | Full closed-loop AC servo motion control teaching experiment device |
| JP2007276031A (en) * | 2006-04-05 | 2007-10-25 | Kitagawa Iron Works Co Ltd | Method and apparatus for monitoring processing target gripping device |
| JP5056796B2 (en) * | 2009-05-28 | 2012-10-24 | アイシン・エィ・ダブリュ株式会社 | Dynamic stiffness measuring device and dynamic stiffness measuring method of spindle in machine tool |
| JP5695555B2 (en) * | 2011-01-28 | 2015-04-08 | オークマ株式会社 | Position control device |
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Inventor after: Luo Yonggang Inventor after: Zhou Yong Inventor after: Shi Dong Inventor before: Luo Yonggang |
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Effective date of registration: 20160608 Address after: 241000 Wuhu Machinery Industrial Park, Wuhu, Anhui, China, Wuhu Patentee after: ANHUI JIEYONGDA INTELLIGENT MACHINE CO., LTD. Address before: 518111, Longgang, Guangdong, Pinghu Shenzhen street Pinghu community Fumin Industrial Zone sixty-fourth Patentee before: Shenzhen Joint Industry Co., Ltd. |
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Address after: 241000 No. 379, Xinwu Economic Development Zone, Wuhu County, Anhui Province Patentee after: Anhui Jieyongda Intelligent Machinery Co., Ltd. Address before: 241000 Wuhu Machinery Industry Park, Wuhu County, Wuhu City, Anhui Province Patentee before: ANHUI JIEYONGDA INTELLIGENT MACHINE CO., LTD. |