CN102012286A - Method and system for testing reliability of electric spindle in machining center - Google Patents

Method and system for testing reliability of electric spindle in machining center Download PDF

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CN102012286A
CN102012286A CN 201010547065 CN201010547065A CN102012286A CN 102012286 A CN102012286 A CN 102012286A CN 201010547065 CN201010547065 CN 201010547065 CN 201010547065 A CN201010547065 A CN 201010547065A CN 102012286 A CN102012286 A CN 102012286A
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main shaft
electric main
test
machining center
electric
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CN 201010547065
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Chinese (zh)
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CN102012286B (en
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尚建忠
陈循
王卓
张详坡
于乃辉
陶俊勇
张春华
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中国人民解放军国防科学技术大学
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Abstract

The invention discloses a system and a method for testing the reliability of an electric spindle in a machining center. The method comprises the following steps of: 1, establishing the system for testing the reliability of the electric spindle in the machining center; 2, determining test environment and test time; 3, performing a function test on the electric spindle to remove early failures; 4, acquiring the performance parameter of the electric spindle in a stable state and determining a failure criterion; and 5, circularly machining a typical workpiece, monitoring the state and performance parameter of the electric spindle and judging the failures. The system comprises a temperature sensor, a noise sensor, a force sensor, an eddy current displacement sensor, a vibration sensor, and a control unit connected with the parts. The system has the advantages of simple and compact structure, low cost, simple principle, convenience of operation, high test accuracy and the like.

Description

A kind of machining center electricity main shaft reliability test method and system
Technical field
The present invention is mainly concerned with the field of process equipment, refers in particular to a kind of test method and system at machining center electricity main shaft reliability.
Background technology
Along with machining center continues to develop towards high speed, efficient and super smart direction, its reliability level becomes the main bottleneck of restriction machining center development.Find that by the reality investigation life-span of electric main shaft is the principal element that influences the machining center reliability, the reliability that therefore will improve machining center must improve the life level of electric main shaft.
At present, the method that improves the reliability of electric main shaft mainly contain select suitable high-speed bearing, lubricated and cooling system reasonable in design, from the configuration aspects design consider to improve electric main shaft dynamically and thermal characteristic etc., all these methods are not all considered electric main shaft integrity problem on the whole.The raising of one-sided performance might not improve the reliability level of electric main shaft, most critical be the principal element that will find out the electric main shaft reliability of influence.And the unique method that addresses this problem carries out fail-test exactly, find out the major failure form of electric main shaft by the method for test, obtain failure mechanism by data analysis then, and propose innovative approach, thereby fundamentally improve the reliability of the electric main shaft of machining center.
Because the complicacy of high speed, high-accuracy property and the environmental stress of machining center electricity main shaft, independent electric main shaft fail-test also is not easy to realize.At present, the test of electricity main shaft mainly is the bench test of carrying out in order to detect its performance, bench test is that electric main shaft is separated from lathe, add corresponding sensor, acquisition system and loading system, set up a stand, electric main shaft is carried out load test separately, detect the various performance parameters of electric main shaft.But the factor that influences its reliability as the electric main shaft of machining center is numerous, the environmental stress complexity, independent bench test can not well reflect the living environment of electric main shaft, the fault mode that draws also might not be that electric main shaft is a main failure forms, therefore bench test only is fit to do the performance test of electric main shaft, rather than fail-test.
Summary of the invention
The technical problem to be solved in the present invention just is: at the technical matters that prior art exists, the invention provides a kind of simple and compact for structure, with low cost, principle is simple, easy and simple to handle, machining center electricity main shaft reliability test method and system that test accuracy is high.
For solving the problems of the technologies described above, the present invention by the following technical solutions.
A kind of machining center electricity main shaft reliability test method is characterized in that step is:
The pilot system of 1., building: the temperature sensor be used for measuring in real time electric spindle axis temperature is set in the work in-process heart operating room, is used for monitoring noise transducer, the force transducer that is used for detecting electric main shaft processing load in the process that electric main shaft idle running period noise changes, is used for monitoring the electric main shaft idle running period and vibrates the vibration transducer of variation and the eddy current displacement sensor that is used for detecting electric spindle rotation accuracy;
2., confirmed test environment and test period;
3., electric main shaft is carried out function test, the eliminating initial failure;
4., the pilot system of utilizing step to build in 1., gather the performance parameter of electric main shaft steady state (SS) and definite failure criterion;
5., representative workpiece is carried out cyclic process, monitor state, the performance parameter of electric main shaft, failure judgement.
As a further improvement on the present invention:
The experimental enviroment of described step in 2. comprises operating voltage, environment temperature, humidity and vibration, the lower voltage limit of the limiting voltage of the nominal voltage of 50% the time of the being set to input design of described operating voltage, 25% time input design, 25% time input design, the tolerance of voltage is nominal voltage ± 10%, and product energising duty should account for more than 90% of test period; Environment temperature is about 20~30 ℃; Humidity is 40%~75%.
The function test of described step in 3. be for making the continuous dry run 72h of electric main shaft, each cycling time no more than 15min, the stop time between each circulation must not surpass 1min.
4. described step is under the cooling condition of regulation, and electric main shaft is running continuously under basic, normal, high rotating speed, is no less than 1h under every grade of rotating speed; After each grade rotating speed reaches steady state (SS), start the pilot system of building, gather the light condition parameter of electric main shaft steady state (SS).
The present invention further provides a kind of machining center electricity main shaft reliability test system, it is characterized in that comprising:
Temperature sensor is installed in the machining center operating room, is used for measuring in real time the axle center temperature of electric main shaft;
Noise transducer is installed in the machining center operating room, is used for monitoring in real time the noise of electric main shaft idle running period and changes;
Force transducer is installed in below the test piece, is used for detecting the processing load of electric main shaft in the process engineering;
Eddy current displacement sensor is used for detecting the rotating accuracy of electric main shaft;
Vibration transducer is used for monitoring the vibration of electric main shaft in the idle running period and changes;
Control module is used for linking to each other with above-mentioned each parts and the data that above-mentioned parts detect is shown and handle.
Described temperature sensor is fixed on by support on the shell of electric main shaft, and the measuring junction of described temperature sensor is aimed at the preceding axle head of electric main shaft.
Described vibration transducer is the three-dimensional acceleration transducer.
Described eddy current displacement sensor is fixed in the front end place of electric main shaft, the handle of a knife portion of the alignment probe electricity main shaft of described eddy current displacement sensor.
Described force transducer is a six-component force sensor, is used for detecting power and the moment of torsion that electric main shaft bears in x, y, three directions of z.
Compared with prior art, advantage of the present invention just is:
1, the present invention electricity main shaft reliability test method and system are to build the reliably monitoring system in the operating room of the direct work in-process heart, and lower to build the time shorter compared with electric its cost of main shaft stand, also easier enforcement.This test method is to examine the reliability of electric main shaft with the cyclic process representative workpiece simultaneously, this also is the environment for use of machining center reality, thereby fully expose the fault of machining center when emphasis is examined electric main shaft, this assessment for the machining center reliability has important value.
2, the environment of electric main shaft work has material impact for the reliability of electric main shaft among the present invention, all environmental stresses all can not be applied on the electric main shaft doing fail-test on the stand, the reliability data that draws is also also insincere, and should electricity main shaft reliability test method be the fail-test that work in-process directly carries out electric main shaft in the heart, can well overcome the shortcoming of bench test, make full use of machining center and adding the environmental stress in man-hour, expose the fault of electric main shaft.
3, the present invention is in order to make electric main shaft the breaking down of short time of trying one's best, No. 45 bigger steel of strength ratio are selected in the present invention's test for use when selecting workpiece, and select roughing feed, big cutting-in and high-speed for use, make electric main shaft be in the poorest operating mode, moment of torsion, radial force and axial force are all bigger, impel electric main shaft fault to occur.Can only give electric main shaft torsional load by dynamometer machine compared with experimental stand, this reliability test method has very big advantage.
Description of drawings
Fig. 1 is the schematic flow sheet of the inventive method;
Fig. 2 is the structural representation of the online reliability test system of machining center electricity main shaft of the present invention;
Fig. 3 is the layout synoptic diagram of each sensor among the present invention;
Fig. 4 is the principle schematic that adopts frequency domain three point tolerance separation methods in the concrete enforcement of the present invention;
Fig. 5 is the synoptic diagram of the present invention's processing parts blank in concrete application example;
Fig. 6 is the synoptic diagram of the present invention's processing back part in concrete application example.
Embodiment
Below with reference to specific embodiment and Figure of description the present invention is described in further details.
A kind of machining center electricity main shaft reliability test method of the present invention the steps include:
The pilot system of 1., building: the temperature sensor that is used for measuring in real time electric main shaft 1 axle center temperature is set in the work in-process heart operating room 9, be used for noise transducer, the force transducer that is used for detecting electric main shaft 1 processing load in the process engineering that the electric main shaft 1 idle running period noise of monitoring in real time changes, be used for monitoring the electric 1 idle running period of main shaft and vibrate the vibration transducer of variation and the eddy current displacement sensor that is used for detecting electric main shaft 1 rotating accuracy;
2., confirmed test environment and test period;
3., electric main shaft 1 is carried out function test, the eliminating initial failure;
4., the pilot system of utilizing step to build in 1., gather the performance parameter of electric main shaft 1 steady state (SS) and definite failure criterion;
5., representative workpiece 6 is carried out cyclic process, monitor state, the performance parameter of electric main shaft 1, failure judgement.
As depicted in figs. 1 and 2, machining center electricity main shaft reliability test system of the present invention comprises: temperature sensor, be installed in the machining center operating room 9, and be used for measuring in real time the axle center temperature of electric main shaft 1; Noise transducer is installed in the machining center operating room 9, is used for monitoring in real time the noise of electric 1 idle running period of main shaft and changes; Force transducer is installed in below the test piece, is used for detecting the processing load of electric main shaft 1 in the process engineering; Eddy current displacement sensor is used for detecting the rotating accuracy of electric main shaft 1; Vibration transducer is used for monitoring the vibration of electric main shaft 1 in the idle running period and changes; Control module is used for linking to each other with above-mentioned each parts and the data that above-mentioned parts detect is shown and handle.The pilot system that this system is in the said method to be built.Representative workpiece 6 is fixing by holder 8, cutter 5 be positioned at representative workpiece 6 directly over.
In the present embodiment, machining center cyclic process representative workpiece 6 begins to add start-up temperature sensor in man-hour, measures electric main shaft 1 axle center temperature rise in real time; In the Tool in Cutting process, start the force transducer that is installed under the representative workpiece 6, gather the electric main shaft 1 processing load of 15min duration; Before carrying out tool changing and the electric main shaft 1 in the intact back of workpiece processing continue idle running 30min, Vibration on Start-up sensor, noise transducer and eddy current displacement sensor are simultaneously measured performance, the state parameter of electric main shaft 1, judge whether fault of electric main shaft 1.
In the present embodiment, temperature sensor is selected the infrared thermometry sensor for use, temperature range is 0 ℃~200 ℃, this sensor is fixed on the shell of electric main shaft 1 by the support 2 that has magnet, measuring head is aimed at electric main shaft 1 preceding axle head (installation site such as Fig. 3), the temperature variation of axle center in process of the electric main shaft 1 of monitoring monitored its temperature rise fault in real time.Vibration transducer adopts the three-dimensional acceleration transducer, this acceleration transducer 3 that has magnet is adsorbed on electric main shaft 1 front end, it mainly comprises sensor probe, constant current source, sensor power supply and signal output cable, be used for measuring electric main shaft 1 axially, radially with circumferential vibration, the vibration of monitoring the 1 idle running period of electric main shaft changes.Noise transducer is installed in the machining center operating room 9 by support, and sensor is selected the free found field sensor for use, and it is made up of microphone and supporting constant current source prime amplifier thereof, by two channel charge amplifiers it is carried out electric charge and amplifies.Monitoring electric main shaft 1 idle running period noise changes.Eddy current displacement sensor is selected in the measurement of electricity main shaft 1 rotating accuracy for use, and this sensor comprises electric vortex displacement sensor probe, eddy current displacement sensor transmitter, eddy current displacement sensor power supply and three parts of signal output cable.Sensor is installed in the front end (installation site such as Fig. 3) of electric main shaft 1 by the displacement sensor bracket 4 that has magnet, sensor probe is aimed at electric main shaft 1 shank portion, measure the rotating accuracy of electric main shaft 1, adopt frequency domain three point tolerance partition methods that electric main shaft 1 turn error is separated simultaneously.This method is protected hero by the blue or green wood of Japanese scholar and is become the husband to propose with great circle, and its principle is to utilize spectrum technology that deviation from circular from and shape error are separated (as Fig. 4):
The intersection point 0 of measuring axis with sensors A, B, C serve as that the measurement initial point is set up measurement coordinate system XOY, is the circularity shape error of tested part, x (θ), y (θ) be respectively tested revolving shaft in θ place gyration error at coordinate axis X, the component of Y direction.φ BA, φ CABe respectively the angle between sensor B, C and the sensors A.Output signal S A(θ), S B(θ), S CBe respectively the gap signal of 1 on measuring sonde A, B, C and electric main shaft (θ), form by turn error x (θ), the y (θ) of electric main shaft 1 and the deviation from circular from r (θ) of benchmark.Periodicity structure three point method fundamental equation based on deviation from circular from is as follows:
s(θ)=c 1r(θ)+c 2r(θ+φ BA)+c 3r(θ+ cA)
C wherein 1, c 2, c 3Be the sensitivity of sensors A, B, C, generally get c 1=1
Utilize discrete Fourier transformation and inverse transformation to separate the three point method fundamental equation and can obtain turn error and deviation from circular from.
Below representative workpiece 6, six-component force sensor 7 is installed as force transducer.Sensor detects power and the moment of torsion that electric main shaft 1 bears in x, y, three directions of z simultaneously in the process of cyclic process representative workpiece 6, simultaneously, workpiece of every processing is just by the working process parameter of amount increase system (as the velocity of rotation of the amount of feeding, bite and electric main shaft 1 etc.), thereby increase electric main shaft 1 suffered power and moment of torsion gradually, draw out the graph of a relation of electric main shaft 1 temperature, vibration, noise and rotating accuracy and electric main shaft 1 load, under situation about breaking down, detect the operating mode of electric main shaft 1 when breaking down.
Adopt the above machining center reliability test system of setting up to carry out the fail-test of electric main shaft 1, cyclic process representative workpiece 6, electric main shaft 1 is under the actual complex environment stress, utilize its state of various sensor monitors, performance parameter, according to failure criterion, accurately obtain the fault mode and the failure message of electric main shaft 1, the weak link of clear and definite electric main shaft 1 is for the reliability that improves electric main shaft 1 provides test basis.
Step 2. in, working environment comprises operating voltage, environment temperature, humidity and vibration.Operating voltage is the nominal voltage of time of 50% input design, the limiting voltage of 25% time input design, the lower voltage limit of 25% time input design, the tolerance of voltage is nominal voltage ± 10%, product energising duty should account for more than 90% of test period, and concrete power-off time section should be selected at random; Environment temperature is generally about 25 ℃ according to actual conditions; Humidity is 40%~75%; Vibration condition normative reference GJB150.16-1986.Test period comprises accumulative total test period, test period and working time every day.Test is regularly ending, accumulative total test period 1500 hours, with process time of representative workpiece be the test period, 8 hours working times every day.
For example: (1) operating voltage; In the electric stress of product duty, the nominal voltage of 50% time input design, the limiting voltage of 25% time input design, the lower voltage limit of 25% time input design, the tolerance of voltage is nominal voltage ± 10%, product energising duty should account for 90% of test period, and concrete power-off time section should be selected at random.
(2) environment temperature; Ambient air temperature is the highest during 1 work of machining center electricity main shaft can not surpass 40 ℃, minimumly can not be lower than-10 ℃, and the temperature that therefore is chosen in experimental enviroment is to carry out about 25 ℃.
(3) humidity; Experimental enviroment relative humidity is not more than 90%, generally gets 40%~75%.
(4) vibration; Basic transportation vibration condition, normative reference GJB150.16-1986 determines.
(5) test period; 1) time of accumulative total fixed time testing is not less than 1500 hours; 2) 24h is a test period, and wherein machining center carries out the time of cut about 90%; 3) time of work every day is no less than 8 hours.
Step 3. in, function test selects for use numerical control to mill the process simulation duty, continuous dry run 72h, each cycling time no more than 15min, the stop time between each circulation must not surpass 1min.Should not break down in the whole operation process, as natural faults such as power failures, carry out after allowing to restart, can add up working time.Breaking down and shut down in all centres, then must carry out continuous 72h simulation cutting dry run test after fixing a breakdown again.
For example: machining center electricity main shaft 1 sample of test usefulness should satisfy standard JBT 10801.2-2007 regulation, for the warranty test sample had passed through certain working time (be sample tided over early fault period advance the accidental age at failure of people) before carrying out machining center electricity main shaft fail-test before test, to carry out function test to machining center electricity main shaft 1, get rid of initial failure.
1) with button, switch or hand control lathe is carried out functional check, test the dirigibility of its action and the reliability of function.Under the basic, normal, high rotating speed of electric main shaft 1, do the long run test that electric main shaft 1 starts, just changes, reverses, stops (comprising braking), continued operation is no less than 7 times, tests the dirigibility of its action.Wherein electric main shaft 1 is done basic, normal, high transformation of speed test, and the difference of the command value of rotating speed and displayed value (measured value) must not be greater than 10%;
2) with numerical control device instruction control electricity main shaft 1 rotating speed, to carry out that basic, normal, high third gear transformation of speed just changes, reverse and starts, orientation, test such as stop, action should be flexibly, reliably;
3) carry out actions such as electric main shaft 1 lock cutter, loose cutter, air blowing with steering order, carry out repeatedly 10 times.The action of electricity main shaft 1 tool-broaching mechanism should be flexibly, reliably, non-fault;
4) mill the process simulation duty with numerical control, do and do not cut continuous dry run test, should not break down in the whole operation process.Continuously the dry run time is 72h, each cycling time no more than 15min, the stop time between each circulation must not surpass 1min.Should not break down in the whole operation process, as natural faults such as power failures, carry out after allowing to restart, can add up working time.Breaking down and shut down in all centres, then must carry out continuous 72h simulation cutting dry run test after fixing a breakdown again.
Step 4. in, state, performance parameter record by reliability test system, the regulation cooling condition under, electric main shaft 1 under basic, normal, high rotating speed continuously the running, be no less than 1h under every grade of rotating speed.After each grade rotating speed reached steady state (SS), start-up temperature, vibration, noise and rotating accuracy acquisition system were gathered the light condition parameter of electric main shaft 1 steady state (SS), and acquisition time is 30min.State, performance parameter comprise temperature, vibration, noise, rotating accuracy and load, and wherein temperature sensor is in monitoring state all the time in process, and six-component force sensor is at in-process measurement 15min.Each carry out before the tool changing and process after the workpiece, electricity main shaft 1 continues idle running 30min with present speed, start noise detection apparatus, vibration detection device and rotating accuracy detecting device simultaneously, electric main shaft 1 state, performance are detected, judge whether fault of electric main shaft 1 according to failure criterion.In the present embodiment, as shown in Figure 6, in the specific embodiment, to the processing of representative workpiece 6, the material of blank is No. 45 steel, and the type of cooling is the mist of oil cooling.
For example: 1) under the cooling condition of regulation, electric main shaft 1 is running continuously under basic, normal, high rotating speed, is no less than 1h under every grade of rotating speed.After each grade rotating speed reached steady state (SS), start-up temperature, vibration, noise and rotating accuracy acquisition system were gathered the light condition parameter of electric main shaft 1 steady state (SS), and acquisition time is 30min.
2) following situation in the official hour, takes place and can determine electric main shaft 1 fault under defined terms in product:
1. can not finish the function (functional fault) of regulation, as electric main shaft 1 do not change, can not tool changing etc.
2. status fault aggravates (electric main shaft 1 vibration values surpasses 2 times of steady-state vibration amplitudes), noise big (the electric main shaft 1 noise sound intensity surpasses 70dB and continues 30min), generate heat big (electric main shaft 1 temperature surpasses 60 ℃ of lasting 2h) etc. as vibration.
3. one or several performance parameter exceeds the variation range (parameter fault) of permission, as the rotating accuracy and the processing parts precision of electric main shaft 1.
Representative workpiece is carried out cyclic process, monitors state, performance parameter and the load parameter of electric main shaft 1, failure judgement:
1) electric main shaft 1 energising preheating is about middling speed no-load running a period of time 30min;
2) representative workpiece 6 is as Fig. 6, and blank such as Fig. 5, material are No. 45 steel, and the type of cooling is the mist of oil cooling, and machined parameters is as follows:
1. the blank profile is rough milled
2. the blank profile is carried out finish-milling
Cutter D10 ball cutter, 970L100-TRIBON
Rotating speed (rev/min) 15000
Feeding (mm/ branch) 1500
Bite (mm) 0.3
3) in process electric main shaft 1 temperature is monitored, six-component force sensor is gathered 15min.Before the tool changing of every execution, electric main shaft 1 continues idle running 30min, starts noise detection apparatus, vibration detection device and rotating accuracy detecting device simultaneously, and electric main shaft 1 state, performance are detected, and judges whether fault of electric main shaft 1 according to failure criterion;
4) above task is carried out in circulation, until breaking down;
5) to carry out record to the fault that occurs, analyze reason, and correct, restart test then, calculate the accumulative total working time.
Step 5. in, failure criterion is:
1) can not finish the function (functional fault) of regulation, as electric main shaft 1 do not change, can not tool changing etc.
2) status fault is as vibration aggravation (electric main shaft 1 vibration values surpasses 2 times of lasting 30min of steady-state vibration amplitude), noise big (the electric main shaft 1 noise sound intensity surpasses 70dB and continues 30min), heating big (electric main shaft 1 temperature surpasses 60 ℃ of lasting 2h) etc.
3) performance parameter exceeds the variation range (parameter fault) of permission, as the rotating accuracy and the processing parts precision of electric main shaft 1.
The processing of fault comprises following step:
1) in time the record trouble phenomenon is also confirmed as far as possible.Recorded content comprises: trouble location, phenomenon of the failure, failure cause, prevailing circumstances condition, fault-time or the like;
2) carry out localization of fault.Carry out necessary failure analysis and fault diagnosis, find out failure mechanism;
3) classification of fault according to a preliminary estimate after obtaining correct failure analysis and fault diagnosis, is found out failure mechanism;
4) estimate issuable misjudgement failure, some fault can produce soft damage to other parts;
5) determine reclamation activities according to above-mentioned analysis and research conclusion, comprise reparation soft damage location;
6) the out of order unit that will not repair, plug-in unit, parts, components and parts etc. should be kept properly the regular period in accordance with regulations, supply and demand will the time analyze;
7) electric main shaft 1 drops into test immediately after reparation.
Below machining center electricity main shaft 1 fail-test, fault judgement and fault handling are illustrated:
Machining center is selected VMC650m five machining centers at a high speed for use, this machining center adopts Heidenhain iTNC530 digital control system, electricity main shaft 1 maximum speed 24000r/m, peak torque 75Nm, peak power 32kW, for examining the reliability of its electric main shaft 1, build electric main shaft 1 reliability test system in this experiment work in-process heart operating room, carry out fail-test.
At first electric main shaft 1 is carried out function test, get rid of initial failure, progressively carry out,, proceed next step test because electric main shaft 1 initial failure does not take place.Under the cooling condition of regulation, electric main shaft 1 is running continuously under basic, normal, high rotating speed, is no less than 1h under every grade of rotating speed, gather the performance parameter of electric main shaft 1 steady state (SS), acquisition time is 30min, electric main shaft 1 initial stage steady-state vibration amplitude, and maximum amplitude is Y direction 0.2859m/ss; Steady state temperature maintains about 30 ℃; It is stable that rotating accuracy keeps.
With the machined parameters rapidoprint of selecting for use is the representative workpiece 6 of No. 45 steel, the roughing time is 4h, the finishing time is 2h, cyclic process representative workpiece 6 is also monitored electric main shaft 1 state, performance parameter, workpiece sensor of every processing gathers twice, and the time is 1h altogether, adds power on main shaft 1 preheating 30min and clamping time, process a workpiece in 8h working time every day, and assess the state of electric main shaft 1.
Early stage, electric main shaft 1 was in stable condition, increased gradually in high strength processing electric main shaft 1 temperature rise in back of having experienced 845h, and temperature is increased to 56.5 ℃ behind the finishing 2.5h, can judge that there is failure risk in electric main shaft 1.
Process workpiece, electric main shaft 1 continues idle running, starts noise detection apparatus, vibration detection device and rotating accuracy detecting device simultaneously, and electric main shaft 1 state, performance are detected.Adopt the three-dimensional acceleration transducer to detect electric main shaft 1 vibration, the vibration signal of gathering is analyzed analytical parameters such as following table
Vibration signal and the initial stage steady-state vibration signal gathered compare, and the peak swing amplitude of electric as can be seen main shaft 1 is significantly increased (as following table), and amplitude is maximum and inferior, and mostly to increase twice many.
The noise signal that noise transducer detects by analyzing, is compared with initial stage steady-state noise signal, and noise intensity has also increased about two ones.
According to above performance data, judge that with reference to failure criterion electric main shaft 1 is status fault, should stop test this moment; Fault is handled, repaired electric main shaft 1 back and continue test.
When 1450h, electric main shaft 1 cutter can not unclamp, and judges that tool-broaching mechanism breaks down, and is same, and fault is handled, and repairs electric main shaft 1 back and continues test.
The above only is a preferred implementation of the present invention, and protection scope of the present invention also not only is confined to the foregoing description, and all technical schemes that belongs under the thinking of the present invention all belong to protection scope of the present invention.Should be pointed out that for those skilled in the art in the some improvements and modifications that do not break away under the principle of the invention prerequisite, for example, these improvements and modifications also should be considered as protection scope of the present invention.

Claims (9)

1. machining center electricity main shaft reliability test method is characterized in that step is:
The pilot system of 1., building: the temperature sensor be used for measuring in real time electric spindle axis temperature is set in the work in-process heart operating room, is used for monitoring noise transducer, the force transducer that is used for detecting electric main shaft processing load in the process that electric main shaft idle running period noise changes, is used for monitoring the electric main shaft idle running period and vibrates the vibration transducer of variation and the eddy current displacement sensor that is used for detecting electric spindle rotation accuracy;
2., confirmed test environment and test period;
3., electric main shaft is carried out function test, the eliminating initial failure;
4., the pilot system of utilizing step to build in 1., gather the performance parameter of electric main shaft steady state (SS) and definite failure criterion;
5., representative workpiece is carried out cyclic process, monitor state, the performance parameter of electric main shaft, failure judgement.
2. machining center electricity main shaft reliability test method according to claim 1, it is characterized in that: the experimental enviroment of described step in 2. comprises operating voltage, environment temperature, humidity and vibration, the lower voltage limit of the limiting voltage of the nominal voltage of 50% the time of the being set to input design of described operating voltage, 25% time input design, 25% time input design, the tolerance of voltage is nominal voltage ± 10%, and product energising duty should account for more than 90% of test period; Environment temperature is about 20~30 ℃; Humidity is 40%~75%.
3. machining center electricity main shaft reliability test method according to claim 1, it is characterized in that: the function test of described step in 3. is for making the continuous dry run 72h of electric main shaft, each cycling time no more than 15min, each the circulation between stop time must not surpass 1min.
4. machining center electricity main shaft reliability test method according to claim 1, it is characterized in that: 4. described step is under the cooling condition of regulation, electric main shaft is running continuously under basic, normal, high rotating speed, is no less than 1h under every grade of rotating speed; After each grade rotating speed reaches steady state (SS), start the pilot system of building, gather the light condition parameter of electric main shaft steady state (SS).
5. machining center electricity main shaft reliability test system is characterized in that comprising:
Temperature sensor is installed in the machining center operating room (9), is used for measuring in real time the axle center temperature of electric main shaft (1);
Noise transducer is installed in the machining center operating room (9), is used for monitoring the noise of electric main shaft (1) idle running period and changes;
Force transducer is installed in below the test piece, is used for detecting the processing load of electric main shaft (1) in the process engineering;
Eddy current displacement sensor is used for detecting the rotating accuracy of electric main shaft (1);
Vibration transducer is used for monitoring the vibration of electric main shaft (1) in the idle running period and changes;
Control module is used for linking to each other with above-mentioned each parts and the data that above-mentioned parts detect is shown and handle.
6. machining center electricity main shaft reliability test system according to claim 5, it is characterized in that: described temperature sensor is fixed on the shell of electric main shaft (1) by support (2), and the measuring junction of described temperature sensor is aimed at the preceding axle head of electric main shaft (1).
7. machining center electricity main shaft reliability test system according to claim 5, it is characterized in that: described vibration transducer is three-dimensional acceleration transducer (3).
8. machining center electricity main shaft reliability test system according to claim 5, it is characterized in that: described eddy current displacement sensor is fixed in the front end place of electric main shaft (1), the handle of a knife portion of the alignment probe electricity main shaft (1) of described eddy current displacement sensor.
9. machining center electricity main shaft reliability test system according to claim 5, it is characterized in that: described force transducer is six-component force sensor (7), is used for detecting power and the moment of torsion that electric main shaft (1) bears in x, y, three directions of z.
CN201010547065XA 2010-11-16 2010-11-16 Method and system for testing reliability of electric spindle in machining center CN102012286B (en)

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CN103195437A (en) * 2013-04-02 2013-07-10 天津大学 Online testing device for hob blade string abrasion of heading machine
CN103336901A (en) * 2013-06-27 2013-10-02 中国人民解放军国防科学技术大学 Statistical analysis technique for accelerated life test related to ineffectiveness in competition
CN103592112A (en) * 2013-10-27 2014-02-19 沈阳建筑大学 Electric main shaft loading testing system and method
CN104656633A (en) * 2014-12-23 2015-05-27 重庆大学 Detecting method for early failure of logistics trolley of flexible manufacturing system
CN105300681A (en) * 2015-11-13 2016-02-03 南京航空航天大学 Electric spindle temperature and thermal deformation testing device
CN105334031A (en) * 2015-09-28 2016-02-17 安阳工学院 Dual-drive spindle test stand and test method
CN105527090A (en) * 2016-02-05 2016-04-27 吉林大学 Electric spindle reliability test bed and reliability test method
CN105938044A (en) * 2016-04-14 2016-09-14 西安交通大学 High-precision liquid hydrostatic spindle axis track test system for grinding machine and high-precision liquid hydrostatic spindle axis track test method thereof
CN106874582A (en) * 2017-01-25 2017-06-20 吉林大学 A kind of electro spindle life test time method for designing
CN108829043A (en) * 2018-09-12 2018-11-16 珠海格力智能装备有限公司 The processing method and processing device of distributed CNC system
CN109940456A (en) * 2017-12-21 2019-06-28 上海铼钠克数控科技股份有限公司 Machine tool chief axis method for testing performance and system
CN110296831A (en) * 2019-07-01 2019-10-01 清华大学 Electro spindle Pneumatic loading and condition monitoring system
CN110571985A (en) * 2019-09-11 2019-12-13 深圳市速锋科技股份有限公司 Preheating running-in method of high-speed electric spindle
WO2020093325A1 (en) * 2018-11-08 2020-05-14 清华大学 Reliability rapid detection device for vertical machining center

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CN101701868A (en) * 2009-11-17 2010-05-05 重庆大学 High-speed electric main shaft dynamic rigidity test device
CN101718658A (en) * 2009-11-17 2010-06-02 重庆大学 Device for testing dynamic stiffness and constant pressure of high-speed electric spindle

Cited By (23)

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CN103195437A (en) * 2013-04-02 2013-07-10 天津大学 Online testing device for hob blade string abrasion of heading machine
CN103195437B (en) * 2013-04-02 2015-07-15 天津大学 Online testing device for hob blade string abrasion of heading machine
CN103336901A (en) * 2013-06-27 2013-10-02 中国人民解放军国防科学技术大学 Statistical analysis technique for accelerated life test related to ineffectiveness in competition
CN103336901B (en) * 2013-06-27 2016-07-06 中国人民解放军国防科学技术大学 The relevant accelerated life test statistical analysis technique of a kind of competing failure
CN103592112A (en) * 2013-10-27 2014-02-19 沈阳建筑大学 Electric main shaft loading testing system and method
CN103592112B (en) * 2013-10-27 2015-09-16 沈阳建筑大学 A kind of electro spindle loads test macro and method
CN104656633A (en) * 2014-12-23 2015-05-27 重庆大学 Detecting method for early failure of logistics trolley of flexible manufacturing system
CN104656633B (en) * 2014-12-23 2017-04-26 重庆大学 Detecting method for early failure of logistics trolley of flexible manufacturing system
CN105334031B (en) * 2015-09-28 2018-01-23 安阳工学院 A kind of test method of dual drive electro spindle
CN105334031A (en) * 2015-09-28 2016-02-17 安阳工学院 Dual-drive spindle test stand and test method
CN105300681A (en) * 2015-11-13 2016-02-03 南京航空航天大学 Electric spindle temperature and thermal deformation testing device
CN105300681B (en) * 2015-11-13 2018-03-30 南京航空航天大学 A kind of electro spindle temperature and heat distortion test device
CN105527090B (en) * 2016-02-05 2018-06-05 吉林大学 Electro spindle reliability test bench and reliability test method
CN105527090A (en) * 2016-02-05 2016-04-27 吉林大学 Electric spindle reliability test bed and reliability test method
CN105938044A (en) * 2016-04-14 2016-09-14 西安交通大学 High-precision liquid hydrostatic spindle axis track test system for grinding machine and high-precision liquid hydrostatic spindle axis track test method thereof
CN105938044B (en) * 2016-04-14 2019-02-05 西安交通大学 The high-precision liquid static pressure electric main shaft orbit of shaft center test macro and method of grinding machine
CN106874582B (en) * 2017-01-25 2018-03-27 吉林大学 A kind of electro spindle life test time design method
CN106874582A (en) * 2017-01-25 2017-06-20 吉林大学 A kind of electro spindle life test time method for designing
CN109940456A (en) * 2017-12-21 2019-06-28 上海铼钠克数控科技股份有限公司 Machine tool chief axis method for testing performance and system
CN108829043A (en) * 2018-09-12 2018-11-16 珠海格力智能装备有限公司 The processing method and processing device of distributed CNC system
WO2020093325A1 (en) * 2018-11-08 2020-05-14 清华大学 Reliability rapid detection device for vertical machining center
CN110296831A (en) * 2019-07-01 2019-10-01 清华大学 Electro spindle Pneumatic loading and condition monitoring system
CN110571985A (en) * 2019-09-11 2019-12-13 深圳市速锋科技股份有限公司 Preheating running-in method of high-speed electric spindle

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