CN106002481B - Assess feed system leading screw prestretching force dynamic performance testing system and test method - Google Patents
Assess feed system leading screw prestretching force dynamic performance testing system and test method Download PDFInfo
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- CN106002481B CN106002481B CN201610309535.6A CN201610309535A CN106002481B CN 106002481 B CN106002481 B CN 106002481B CN 201610309535 A CN201610309535 A CN 201610309535A CN 106002481 B CN106002481 B CN 106002481B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
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- B23Q17/007—Arrangements for observing, indicating or measuring on machine tools for managing machine functions not concerning the tool
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Abstract
A kind of dynamic performance testing system and test method for assessing feed system leading screw prestretching force, system has the motor being arranged on pedestal, the leading screw that motor is connected by shaft coupling, the nut being arranged on leading screw, the workbench of nut is fixedly connected with by the nut seat of bottom, guide rail is provided with by guide rail supporting frame on pedestal, leading screw is positioned respectively by the front end Bearning mechanism and tail end Bearning mechanism that are fixed on pedestal and laser interference test system, mould measurement system and performance test system.Method：Elastic shaft sleeve is demarcated using the caliberating device of elastic shaft sleeve, obtains the calibration linear relation of elastic shaft sleeve；Carry out the test of feed system modal test, feed system movenent performance index test and the test of feed system thermal characteristics respectively under the axial prestretching force of different gradients.Utilization assessment index of the present invention handles test data, and analysis leading screw prestretching force is to the affecting laws of feed system dynamic property, comprehensive assessment leading screw prestretching force state.
Description
Technical field
The present invention relates to a kind of NC machine tool feed system dynamic performance testing systems.More particularly to a kind of assessment feeding
System leading screw prestretching force dynamic performance testing system and test method.
Background technology
In order to ensure numerically-controlled machine tool machining accuracy and efficiency, it is necessary to be surveyed online to the dynamic property of feed system
Amount.And in the case where feed system mechanical structure and servo parameter give, feed system ball-screw prestretching force is big
It is small to become the principal element for influencing its dynamic characteristic.In order to improve the rigidity of Ball-screw Drive Systems and compensation leading screw thermal change pair
The influence of feed system positioning accuracy will usually be pre-stretched ball-screw, i.e., by leading screw one end locking nut
It pre-tightens to complete.Ball-screw prestretching force has an impact feed system dynamic property, and prestretching force, which crosses conference, causes leading screw
For bearing heating seriously so as to influence the service life, prestretching force is too small to cause system rigidity insufficient, influence the positioning accurate of feed system
Degree.Therefore must reasonably be chosen for ball-screw prestretching force.And in practical situations, to feed system ball wire
The assessment of thick stick prestretching force state is mainly completed by the experience of engineer, is lacked corresponding quantizating index, is caused to feed
The dynamic property of system is not achieved optimal.
The content of the invention
It can complete to move leading screw prestretching force and feed system the technical problem to be solved by the invention is to provide one kind
State property energy test data collection and processing for assessing feed system leading screw prestretching force dynamic performance testing system and test
Method.
The technical solution adopted in the present invention is：A kind of dynamic performance testing system for assessing feed system leading screw prestretching force
System, including in NC machine tool feed system pedestal, be arranged on pedestal motor, motor output shaft connected by shaft coupling
Leading screw, be arranged on leading screw can with the rotation of leading screw and horizontal linear movement nut, fixed by the nut seat of bottom
The workbench of attaching nut is provided with to guide the guide rail of movable workbench, institute by guide rail supporting frame on the pedestal
The leading screw stated is positioned respectively by the front end Bearning mechanism and tail end Bearning mechanism that are fixed on pedestal, the corresponding work
It is respectively arranged with as platform：System is tested for measuring the laser interference of feed system movenent performance index during working table movement
System, the mould measurement system of feed system dynamic characteristic when applying excitation to workbench for measuring, the corresponding front end axis
It holds mechanism and tail end Bearning mechanism is provided with to measure the performance test system of thermal characteristics during guide screw movement, it is described
Laser interference test system, mould measurement system and performance test system connect industrial personal computer respectively.
It is a kind of to be filled for assessing the calibration of elastic shaft sleeve in the dynamic performance testing system of feed system leading screw prestretching force
It puts, includes the staking-out work platform for being formed with T-shaped groove, the calibration on the staking-out work platform is fixed on by T-slot bolt
Pedestal, described demarcate on pedestal are disposed with locating clip lid and head cover by studs from the bottom to top, wherein, described determines
It is used to set the elastic shaft sleeve being calibrated between position folder lid and calibration pedestal, foil gauge is provided on the elastic shaft sleeve, it is described
The signal input part of test signal collecting unit, the test in the signal output part connection static strain testing system of foil gauge
Signal gathering unit connects industrial personal computer, is provided with to gather the pressure sensing of nominal pressure between the locating clip lid and head cover
Device, the studs upper end are connected through a screw thread the force nut for being useful for applying nominal pressure, the calibration pedestal) on
It is additionally provided with the lead for being oriented to the locating clip lid and head cover.
Test method in a kind of dynamic performance testing system for assessing feed system leading screw prestretching force, including walking as follows
Suddenly：
1) caliberating device of elastic shaft sleeve in the dynamic performance testing system for assessing feed system leading screw prestretching force is utilized
Elastic shaft sleeve is demarcated, obtains the calibration linear relation F=a △ x+b of elastic shaft sleeve, wherein, a, b are for be calibrated
Number, △ x elastic shaft sleeve axial strain averages, axial force suffered by F elastic shaft sleeves.In feed system ball-screw away from motor one end
Pre-load nut and tail end Bearning mechanism bearing inner race between add in the elastic shaft sleeve demarcated, adjustment pre-load nut is to leading screw
Apply by four light gradient axial direction prestretching forces, four different gradient axes are gathered using eastern magnificent static strain testing system again
Elastic shaft sleeve axial strain data under prestretching force, the calibration linear relation F=a △ x+b based on elastic shaft sleeve, then profit
With MATLAB to strain testing system acquisition to elastic shaft sleeve axial deformation data handle, obtain four different gradients
Axial prestretching force data；
2) test of feed system modal test, feed system movement are carried out respectively under the axial prestretching force of different gradients
Testing performance index and the test of feed system thermal characteristics.
The dynamic performance testing system and test method of the assessment feed system leading screw prestretching force of the present invention, can be to silk
Thick stick prestretching force and feed system dynamic property are tested, collecting test data, and Utilization assessment index carries out test data
Processing, analysis leading screw prestretching force is to the affecting laws of feed system dynamic property, comprehensive assessment leading screw prestretching force state.
The assessment feed system leading screw prestretching force dynamic performance testing system and test method of this hair, it is bright can be quickly accurate
The size of leading screw prestretching force really is measured, comprehensive feed system modal test, movenent performance index test and thermal characteristics are surveyed
Amount is as a result, fully and effectively assess leading screw prestretching force state and feed system dynamic property, for instructing engineer
The ball-screw of feed system is reasonably pre-stretched, improves the processing performance of numerically-controlled machine tool.
Description of the drawings
Fig. 1 is the structure diagram of present invention assessment feed system leading screw prestretching force dynamic performance testing system；
Fig. 2 is leading screw prestretching force test structure schematic diagram in the present invention；
Fig. 3 is for the caliberating device dimensional structure diagram of elastic shaft sleeve in test system of the present invention；
Fig. 4 is for the caliberating device front view of elastic shaft sleeve in test system of the present invention.
In figure
1：Pedestal 2：Motor
3：Shaft coupling 4：Front end Bearning mechanism
5：Leading screw 6：Nut
7：Guide rail 8：Workbench
9：Power hammer 10：Vibrator
11：Acceleration transducer 12：Laser
13：Interference mirror 14：Speculum
15：Temperature sensor 16：Eddy current displacement sensor
17：Industrial personal computer 18：Bearing block
19：Internal axle sleeve 20：Elastic shaft sleeve
21：Pre-load nut 22：Baffle ring
23：Foil gauge 24：End cap
25：Location nut 26：Tail end Bearning mechanism
27：Nut seat 28：Series connection bearing group
29：Outer shaft 30：Test signal collecting unit
31：Control and test signal collecting unit 32：Data acquisition unit
33：T-shaped groove 34：Staking-out work platform
35：T-slot bolt 36：Demarcate pedestal
37：Lead 38：Studs
39：Exert a force nut 40：Head cover
41：Locating clip lid 42：Guide rail supporting frame
43：Pressure sensor
Specific embodiment
With reference to embodiment and attached drawing to assessment feed system leading screw prestretching force dynamic performance testing system of the invention
System and test method are described in detail.
The dynamic performance testing system and caliberating device of the assessment feed system leading screw prestretching force of the present invention, according to test
It is hard to build feed system dynamic performance testing system for the suitable sensor of task choosing, configuration data harvester and industrial personal computer
Part test platform.The feed system dynamic performance testing system hardware test platform includes feed system ball-screw prestretching
Stretch calibration test platform, feed system modal test platform, feed system movenent performance index test platform and feeding system
System thermal characteristics test platform.
As shown in Figure 1, the dynamic performance testing system of the assessment feed system leading screw prestretching force of the present invention, including numerical control
Pedestal 1 in Machine Tool Feeding System, the motor 2 being arranged on pedestal 1, the leading screw 5 for connecting by shaft coupling 32 output shaft of motor,
Be arranged on leading screw 5 can with the rotation of leading screw 5 and horizontal linear movement nut 6, fixed by the nut seat 27 of bottom
The workbench 8 of attaching nut 6 is led by what guide rail supporting frame 42 was provided with workbench 8 is guided to move on the pedestal 1
Rail 7, the leading screw 5 is positioned respectively by the front end Bearning mechanism 4 that is fixed on pedestal 1 and tail end Bearning mechanism 26, right
Workbench 8 that should be described is respectively arranged with：For measuring the laser of feed system movenent performance index in 8 motion process of workbench
Interference testing system, the mould measurement system of feed system dynamic characteristic when applying excitation to workbench 8 for measuring, corresponding institute
The front end Bearning mechanism 4 and tail end Bearning mechanism 26 stated are provided with to measure the thermal characteristics of thermal characteristics in 5 motion process of leading screw
Test system, laser interference test system, mould measurement system and performance test system connect industrial personal computer 17 respectively.
Described laser interference test system uses laser interference system of the producer for Renishaw, in system：Laser
12 are arranged on the workbench 8 away from 2 one side of motor, and interference mirror 13 is fixed on pedestal 1, and speculum 14 is fixed on workbench 8
On, the laser 12, interference mirror 13 and speculum 14 are located in same light path, the signal output part connection of the laser 12
The signal input part of test signal collecting unit 30 in laser interference test system, the test signal collecting unit 30 connect work
Control machine 17.
The mould measurement system uses producer to test system for the LMS of LMS companies of Belgium, in system：Control and
Test signal collecting unit 31 connects industrial personal computer 17, respectively connection control and the control signal output of test signal collecting unit 31
End and acquisition signal input part are for generating the one side that the vibrator 10 of exciting force is arranged on workbench 8, and connection controls and test
The power hammer 9 of the acquisition signal input part of signal gathering unit 31 corresponds to the test point tapped on workbench 8, connection control and test
12~24 acceleration transducers 11 of the acquisition signal input part of signal gathering unit 31 are laid in respectively：It is set on nut seat 27
2~4 are equipped with, 1~2 is provided on front end Bearning mechanism 4,1~2 is provided on tail end Bearning mechanism 26, workbench 8
On be provided with 8~16.
The performance test system uses producer to test system for the thermal characteristics of Beijing Collihigh Sensor Technology Center
It unites, in system：Data acquisition unit 32 connects industrial personal computer 17, and 2~4 temperature sensors 15 of connection data acquisition unit 32 divide
It is not laid on the bearing block of front end Bearning mechanism 4 1~2,1~2 on the bearing block of tail end Bearning mechanism 26, connects data
The eddy current displacement sensor 16 of collecting unit 32 is fixed on pedestal 1 and corresponding to the external part for the leading screw 5 being pre-stretched.
The test end face of the eddy current displacement sensor 16 and the end face of 5 external part of leading screw are arranged in parallel, and at a distance of 0.5
~1mm.
As shown in Fig. 2, the tail end Bearning mechanism 26 includes：Include bearing block 18, in bearing block 18
The two string formations connection bearing group 28 for being used to support fixed leading screw 5 and being packed into the form of back-to-back, two string formations join between bearing group 28
Internal axle sleeve 19 is provided with, two string formations connection bearing group 28 is provided with elastic shaft sleeve 20 positioned at 5 end one side of leading screw, away from leading screw 5
End one side is provided with outer shaft 29, and the periphery of the outer shaft 29 and elastic shaft sleeve 20 is respectively arranged with baffle ring 22, wherein, institute
The both ends for stating bearing block 18 are provided with to position the end cap 24 of bearing group 28 and baffle ring 22, the end cap 24 respectively by screw
The through hole for being centrally formed with that leading screw 5 can be run through, the end thread of the leading screw 5 be connected with to apply axis to leading screw 5
To the pre-load nut 21 of prestretching force, the periphery of the elastic shaft sleeve 20 is evenly arranged with 3~4 for measuring leading screw 5 axially
The foil gauge 23 of deformation, test signal is adopted in the signal output part connection " east China static strain testing system " of the foil gauge 23
Collect the signal input part of unit, the test signal collecting unit connects industrial personal computer 17.The leading screw 5 is located at the one of outer shaft 29
Side is provided with location nut 25.
As shown in Figure 3, Figure 4, for assessing elastic shaft in the dynamic performance testing system of feed system leading screw prestretching force
The caliberating device of set, includes the staking-out work platform 34 for being formed with T-shaped groove 33, and the mark is fixed on by T-slot bolt 35
Determine the calibration pedestal 36 on workbench 34, described demarcate on pedestal 36 is disposed with positioning from the bottom to top by studs 38
Lid 41 and head cover 40 are pressed from both sides, wherein, the elastic shaft sleeve being calibrated between the locating clip lid 41 and calibration pedestal 36 for setting
20, foil gauge 23 is provided on the elastic shaft sleeve 20, " east China static strain is surveyed for the signal output part connection of the foil gauge 23
The signal input part of test signal collecting unit in test system ", the test signal collecting unit connect industrial personal computer 17.It is described fixed
It is provided with to gather the pressure sensor 43 of nominal pressure between position folder lid 41 and head cover 40,38 upper end of studs leads to
The force nut 39 for being threadedly coupled and being useful for applying nominal pressure is crossed, that is, passes through the force nut on synchronous precession studs 38
39 provide the axial force of elastic shaft sleeve.It is additionally provided on the calibration pedestal 36 through the locating clip lid 41 and head cover
40 lead 37 for being oriented to the locating clip lid 41 and head cover 40.
The lead 37 and studs 38 is each provided with 2, in the upper surface of calibration pedestal 36 using center as circle
The heart, with 2~2.5 times of 20 overall diameter of elastic shaft sleeve to be formed with 2 guiding for fixed guide column 37 on the circumference of diameter
Hole slot and 2 screw hole slots for being used to connect studs 38, the guiding hole slot and screw hole slot is are arranged at intervals, in locating clip
It is equal shape on the circumference of diameter with 2~2.5 times of 20 overall diameter of elastic shaft sleeve using respective center as the center of circle on lid 41 and head cover 40
Into have 2 for through lead 37 pilot hole and 2 be used for through studs 38 stud bolt holes, the pilot hole with
Stud bolt hole is arranged at intervals, and 90o is spaced between each pilot hole and threaded hole.The lead 37 and the bottom of studs 38
Sequentially pass through the guiding that corresponding pilot hole and stud bolt hole on head cover 40 and locating clip lid 41 are fixed on the calibration pedestal 36
In hole slot and screw hole slot.The bottom of the lead 37 coordinates with the guiding hole slot on the calibration pedestal 36 for transition, institute
Lead 37 is stated to be gap-matched with the pilot hole on locating clip lid 41 and head cover 40.
The upper surface of the locating clip lid 41 is formed with diameter more than 43 1~2mm of diameter of pressure sensor, depth 2
The upper end cylinder locating slot for fixation pressure sensor 43 of~3mm, the lower face of the locating clip lid 41 is formed with
Diameter is more than 20 1~2mm of diameter of elastic shaft sleeve, depth is being positioned for fixing the lower end of elastic shaft sleeve 20 cylinder for 2~3mm
Slot, the upper end cylinder locating slot and lower end cylinder locating slot are coaxial arrangement.
The test method being used to assess in the dynamic performance testing system of feed system leading screw prestretching force of the present invention, bag
Include following steps：
1) caliberating device of elastic shaft sleeve in the dynamic performance testing system for assessing feed system leading screw prestretching force is utilized
Elastic shaft sleeve is demarcated, 3~4 foil gauges are circumferentially uniformly pasted onto on elastic shaft sleeve to be calibrated, are pulled with torque
Hand tightens force nut as force application means, and elastic shaft is gathered respectively by pressure sensor and Dong Hua static strain testing systems
Axial force data and its axial strain data suffered by set determine that axial force suffered by elastic shaft sleeve axially becomes with it based on Hooke's law
Linear relationship between shape obtains the calibration linear relation F=a △ x+b of elastic shaft sleeve, wherein, a, b are for be calibrated
Number, △ x elastic shaft sleeve axial strain averages, axial force suffered by F elastic shaft sleeves, and in this, as measuring axial direction prestretching force
Foundation.
Axial prestretching force test is in pre-load nut of the feed system ball-screw away from motor one end and tail end bearing
The elastic shaft sleeve demarcated is added between the bearing inner race of mechanism, 3~4 foil gauges are circumferentially uniformly pasted onto elastic shaft sleeve
On, adjustment pre-load nut applies leading screw by four light gradient axial direction prestretching forces, utilizing eastern magnificent static strain testing again
Elastic shaft sleeve axial strain data under the different gradient axial direction prestretching forces of system acquisition four, the calibration line based on elastic shaft sleeve
Sexual intercourse formula F=a △ x+b recycle MATLAB to carry out the elastic shaft sleeve axial deformation data that strain testing system acquisition arrives
Processing obtains the axial prestretching force data of four different gradients；
2) test of feed system modal test, feed system movement are carried out respectively under the axial prestretching force of different gradients
Testing performance index and the test of feed system thermal characteristics.Wherein：
The feed system modal test test is to carry out hammering method modal test first, is then tried in hammering method mode
Vibrator method modal test is carried out on the basis of testing and obtains accurate feed system dynamic characteristic parameter, is obtained according to step 1)
The axial prestretching force data of four different gradients change the leading screw prestretching force repetition feed system modal test and tested
Cheng Sici obtains the feed system dynamics under four different gradient leading screw prestretching forces.Wherein：
The hammering method modal test is the method using single point excitation more points collection, including：
(1) 10~20 location arrangements test points are chosen on feed system workbench position, wherein, it is selected on nut seat
2~4 location arrangements test points is taken to install acceleration transducer additional, choosing 8~16 location arrangements test points in workbench installs additional
Acceleration transducer.In LMS mould measurement systems：Each test point arranged on corresponding nut seat and on workbench is established corresponding
Test point, and each test point is sequentially connected according to the test point position of hammering method modal test, establishes geometrical model；
(2) excitation and response channel are set and acceleration transducer is calibrated, and sampling parameter is set：Including sampling
Frequency, analysis bandwidth, filp-flop stage and window function；
(3) can measure after set-up has been completed, firmly hammer taps workbench, is adopted using LMS mould measurement systems
Collect pumping signal and the response signal of each measuring point, obtain corresponding frequency response function；
(4) frequency response function for obtaining hammering method modal test is by the model analysis module in LMS mould measurement systems
Processing obtains the intrinsic frequency of feed system；
The method that the vibrator method modal test equally uses single point excitation more points collection, including：
(1) it is Bearning mechanism and tail in front end on the basis of workbench selected by hammering method and nut seat test point position
1~2 measuring point is additionally chosen in end bearing mechanism respectively and arranges acceleration transducer, table spindle is selected to end face center position
It takes impacting point and installs vibrator additional.In LMS mould measurement systems：On corresponding nut seat, on workbench, front end Bearning mechanism and
Each test point arranged on tail end Bearning mechanism establishes corresponding test point, according to the test point position of vibrator method modal test
Each test point is sequentially connected, establishes geometrical model；
(2) excitation and response channel and sampling parameter are set, and sampling parameter includes：Test bandwidth, spectral line, frequency discrimination
Rate, filp-flop stage and window function；
(3) intrinsic frequency for defining measurement direction, output voltage amplitude and measurement functions and being obtained according to hammering method is set
Vibrator swept frequency range；It can measure after set-up has been completed, using LMS mould measurement system acquisition pumping signals and respectively
The response signal of measuring point obtains corresponding frequency response function；It is imported in model analysis module in LMS mould measurement systems by swashing
The frequency response function that device method of shaking modal test obtains show that the intrinsic dynamics of system including intrinsic frequency and Mode Shape is special
Property；
The feed system movenent performance index test is to complete feeding using Renishaw laser interferences test system
The acquisition of system workbench exercise data information, and using MATLAB the data collected are handled to obtain every motility
Energy index, specifically includes：
(1) speculum is fixed on the table, interference mirror is fixed on guide rail that (ensuring will not in working table movement stroke
Collide with interference mirror), the position of adjustment laser, interference mirror and speculum carries out laser alignment；
(2) sampling parameter is set, including sample frequency, sampling time, triggered time；
(3) feed system numerical control operation program is write, including：Displacement motion on a slope signal, speed ramp motor message and
Move back and forth signal；
(4) feed system numerical control operation program is performed, using laser interference test system acquisition feed system in three kinds of fortune
The location information of dynamic signal lower table movement, will collect operating position information and is stored in the form of tables of data；
(5) based on response efficiency, positioning accuracy, speed tracing characteristic and lag characteristic this tetrathlon performance indicator meter
Formula is calculated, three kinds of motor message lower table position datas being stored in tables of data handle using MATLAB
To the curve of three kinds of motor message lower tables movements of tetrathlon performance indicator and drafting of feed system；
It is described based on this tetrathlon performance indicator of response efficiency, positioning accuracy, speed tracing characteristic and lag characteristic
Calculation formula it is specific as follows：
The response efficiency index is reflection feed system to the response performance of displacement motion on a slope signal, computational chart
It is up to formulaWherein tpThe theoretical moment of stroke, t are covered for feed systemcIt is reached for the actual displacement of feed system
At the time of in desired displacement scope ε, teTo test finish time；
The positioning accuracy index is to reflect physical location of the feed system under displacement motion on a slope signal and ideal
Deviation between position, calculation expression areWherein choose the theoretical moment t that feed system covers strokepAs spy
Point is levied, by feed system actual displacement XrWith desired displacement XeThe ratio between be used as positioning accuracy index；
The speed tracing characteristic index is reflection feed system actual speed and reason under speed ramp motor message
Think the degree of closeness of speed, calculation expression isWherein VeFor the ideal velocity value of feed system, VrFor feed system
Accelerate to theoretical moment tiCorresponding values for actual speed, the ratio of the two is as speed tracing characteristic index；
The lag characteristic index is to reflect dynamic respond of the feed system to reciprocating motion signal, calculation expression
FortaAt the time of maximum displacement being actually reached for feed system, tiWhen reaching the theory of maximum displacement for feed system
It carves, the ratio of the two is as lag characteristic index.
(6) the axial prestretching force data of the four different gradients obtained according to step 1), change leading screw prestretching force weight
(1)~(5) step four times again obtains the feed system movenent performance index under four different gradient leading screw prestretching forces.
The feed system thermal characteristics test is to carry out bearing block temperature using performance test system to rise test and ball
The thermal deformation of leading screw axial direction is tested, and is specifically included：
(1) will be passed in each fixed 1~2 temperature of the bearing block of the bearing block of front end Bearning mechanism and tail end Bearning mechanism
The signal input part of sensor is connected with the respective channel of NI data collecting cards in performance test system, and gets the bid in LabVIEW
Determine temperature sensor；
(2) it is located at NI in the signal input part and performance test system of the eddy current displacement sensor at leading screw pre-stretching end
The respective channel of data collecting card is connected, and current vortex micro-displacement sensor is demarcated in LabVIEW.Write feed system numerical control
Operation program sets feed speed such as 4800mm/min, single direction stroke length such as 800mm, moves back and forth, and setting run time is such as
30min；
(3) perform feed system numerical control operation program, by temperature sensor and eddy current displacement sensor acquisition into
To in the run time of default, the temperature of the bearing block of front end Bearning mechanism and the bearing block of tail end Bearning mechanism rises data,
And ball-screw axial direction thermal deformation data, it and is stored in the tables of data of LabVIEW, using MATLAB to the front end that collects
The temperature of the bearing block of Bearning mechanism and the bearing block of tail end Bearning mechanism rises data and ball-screw axial direction thermal deformation data,
It is handled and draws curve；
(4) once treat that the bearing block of front end Bearning mechanism and the bearing block temperature of tail end Bearning mechanism are down to after the test
Stationary value, the axial prestretching force data of the different gradients of four obtained according to step 1) change leading screw prestretching force and repeat the
(1)~(3) step four times obtains the feed system bearing block Wen Sheng and ball wire under four different gradient leading screw prestretching forces
Thick stick Axial Thermal deformation data is simultaneously compared.
Claims (3)
1. it is a kind of for assessing the caliberating device of elastic shaft sleeve in the dynamic performance testing system of feed system leading screw prestretching force,
The dynamic performance testing system of the assessment feed system leading screw prestretching force, including the bottom in NC machine tool feed system
Seat（1）, be arranged on pedestal（1）On motor（2）, pass through shaft coupling（3）Connect motor（2）The leading screw of output shaft（5）, be arranged on
Leading screw（5）On can be with leading screw（5）Rotation and horizontal linear movement nut（6）, pass through the nut seat of bottom（27）Gu
Determine attaching nut（6）Workbench（8）, the pedestal（1）On pass through guide rail supporting frame（42）It is provided with to guide work
Platform（8）Mobile guide rail（7）, the leading screw（5）Respectively by being fixed on pedestal（1）On front end Bearning mechanism（4）And tail
End bearing mechanism（26）It is positioned, the corresponding workbench（8）It is respectively arranged with：For measuring workbench（8）It is moved through
The laser interference test system of feed system movenent performance index in journey, for measuring to workbench（8）It is fed when applying excitation
The mould measurement system of system dynamic characteristic, the corresponding front end Bearning mechanism（4）With tail end Bearning mechanism（26）It is provided with
For measuring leading screw（5）The performance test system of thermal characteristics in motion process, laser interference test system, mode are surveyed
Test system and performance test system connect industrial personal computer respectively（17）；
The tail end Bearning mechanism（26）Include：Include bearing block（18）, positioned at bearing block（18）Interior is used to support
Fixed leading screw（5）And the two string formations connection bearing group being packed into the form of back-to-back（28）, two string formations connection bearing group（28）Between set
It is equipped with internal axle sleeve（19）, two string formations connection bearing group（28）Be located at leading screw（5）End one side is provided with elastic shaft sleeve（20）, it is separate
Leading screw（5）End one side is provided with outer shaft（29）, the outer shaft（29）And elastic shaft sleeve（20）Periphery be respectively arranged with
Baffle ring（22）, wherein, the bearing block（18）Both ends be provided with to position bearing group respectively by screw（28）And baffle ring
（22）End cap（24）, the end cap（24）Be centrally formed with can run through leading screw（5）Through hole, the leading screw（5）'s
End thread is connected with for leading screw（5）Apply the pre-load nut of axial prestretching force（21）, the elastic shaft sleeve（20）'s
Periphery is evenly arranged with 3 ~ 4 for measuring leading screw（5）The foil gauge of axial deformation（23）, the foil gauge（23）Signal it is defeated
The signal input part of test signal collecting unit, the test signal collecting unit connect in outlet connection static strain testing system
Connect industrial personal computer（17）, the leading screw（5）Positioned at outer shaft（29）One side be provided with location nut（25）；
It is characterized in that, caliberating device, which includes, is formed with T-shaped groove（33）Staking-out work platform（34）, pass through T-slot bolt
（35）It is fixed on the staking-out work platform（34）On calibration pedestal（36）, the calibration pedestal（36）On pass through studs
（38）Locating clip lid is disposed with from the bottom to top（41）And head cover（40）, wherein, the locating clip lid（41）With calibration bottom
Seat（36）Between for setting the elastic shaft sleeve that is calibrated（20）, the elastic shaft sleeve（20）On be provided with foil gauge（23）, institute
State foil gauge（23）Signal output part connection static strain testing system in test signal collecting unit signal input part, institute
State test signal collecting unit connection industrial personal computer（17）, the locating clip lid（41）And head cover（40）Between be provided with to gather
The pressure sensor of nominal pressure（43）, the studs（38）Upper end, which is connected through a screw thread, to be useful for applying nominal pressure
Exert a force nut（39）, the calibration pedestal（36）On be additionally provided with for the locating clip lid（41）And head cover（40）Into
The lead that row is oriented to（37）.
It is 2. according to claim 1 elastic in the dynamic performance testing system of feed system leading screw prestretching force for assessing
The caliberating device of axle sleeve, which is characterized in that the lead（37）And studs（38）2 are each provided with, at calibration bottom
Seat（36）Upper surface using center as the center of circle, with elastic shaft sleeve（20）2 ~ 2.5 times of overall diameter are to be formed with 2 on the circumference of diameter
It is a to be used for fixed guide column（37）Guiding hole slot and 2 for connecting studs（38）Screw hole slot, the pilot hole
Slot and screw hole slot is are arranged at intervals, in locating clip lid（41）And head cover（40）On using respective center as the center of circle, with elastic shaft sleeve
（20）2 ~ 2.5 times of overall diameter have been respectively formed on 2 for through lead for the circumference of diameter（37）Pilot hole and 2 use
In through studs（38）Stud bolt hole, the pilot hole and stud bolt hole be arranged at intervals, the lead（37）With it is double
Header stud（38）Bottom sequentially pass through head cover（40）With locating clip lid（41）Upper corresponding pilot hole and stud bolt hole are fixed on
The calibration pedestal（36）Guiding hole slot and screw hole slot in；The lead（37）Bottom and the calibration pedestal（36）
On guiding hole slot be transition cooperation, the lead（37）With locating clip lid（41）And head cover（40）On pilot hole use
Clearance fit.
It is 3. according to claim 1 elastic in the dynamic performance testing system of feed system leading screw prestretching force for assessing
The caliberating device of axle sleeve, which is characterized in that the locating clip lid（41）Upper surface be formed with diameter more than pressure sensor
（43）1 ~ 2mm of diameter, depth are 2 ~ 3mm for fixation pressure sensor（43）Upper end cylinder locating slot, described determines
Position folder lid（41）Lower face be formed with diameter more than elastic shaft sleeve（20）1 ~ 2mm of diameter, depth are 2 ~ 3mm for fixing bullet
Property axle sleeve（20）Lower end cylinder locating slot, the upper end cylinder locating slot and lower end cylinder locating slot is coaxially set
It puts.
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| CN106041641B (en) * | 2016-05-10 | 2018-01-19 | 天津大学 | Assess feed system leading screw prestretching force dynamic performance testing system and caliberating device |
| CN107621361B (en) * | 2017-08-02 | 2019-03-05 | 大连理工大学 | A kind of closed loop control method loosening testing machine based on accurate control bolt transverse load |
| CN107470978B (en) * | 2017-10-18 | 2019-07-09 | 广东正业科技股份有限公司 | A kind of lead screw and its nose balance System and method for |
| CN114102165B (en) * | 2021-10-26 | 2022-09-13 | 山东辰兴数控机械有限公司 | Stretching method for pre-stretching lead screw of large gantry machining center |
| CN117990485B (en) * | 2024-04-03 | 2024-07-02 | 湖南科技大学 | Effective pre-tensioning force field detection method for anchor bolts |
| CN118482914A (en) * | 2024-06-18 | 2024-08-13 | 徐州顺轩自动化科技有限公司 | Performance test method and system for high-precision guide rail lead screw |
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