CN105258888B - Research experiment device and measuring method of the bearing magnitude of interference to axis system performance impact - Google Patents
Research experiment device and measuring method of the bearing magnitude of interference to axis system performance impact Download PDFInfo
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Abstract
Research experiment device and measuring method the invention provides a kind of bearing magnitude of interference to axis system performance impact：Testing main shaft upper-part mainly includes the angular contact ball bearing of a pair of back-to-back form installations, one locking nut and a spacer ring, by changing the magnitude of interference size between main shaft and bearing using the micrometre grade thin pad of different-thickness between main shaft and the mating surface of bearing inner race, apply axial load in spindle nose, radial load analog main shaft machining operating mode, test the Static stiffness of different magnitude of interference lower main axis systems, rotating accuracy, temperature rise and vibration, and axis system characteristics of mode is tested by hammering method, the present invention simplifies axis system structure, exclude the influence of other assembly parameter shaft performances, can be more comprehensive, rule of the convenient test bearing magnitude of interference to axis system performance impact.
Description
Technical field
Research experiment device and measuring method the present invention relates to a kind of bearing magnitude of interference to axis system performance impact, tool
Body is related to implementation of the interference fit parameter for considering different bearing inner races and main shaft in experimental provision, and passes through experiment
Method of testing is to the axis system Static stiffness in the case of different value of interference fit, bearing outer ring temperature, shafting rotating accuracy, main shaft
The performances such as vibration, intrinsic frequency are tested.
Background technology
In high-speed main spindle-bearing arrangement, bearing inner race is attached with main shaft using interference fit, on the one hand its structure
Simply, it on the other hand can cause that centering precision is higher.However, the selection of value of interference fit size and residing for axis system plus
Work operating mode (such as speed of mainshaft, cutting force, cutting speed) is relevant, as machine tool chief axis processes the change of operating mode, is imitated in centrifugation
Should be with the combined influence of the factor such as fuel factor, main shaft and bearing inner race can deform, and cause the two connection status to occur
Change, further influence the processing characteristics of shafting.The magnitude of interference is chosen excessive often so that the assembling of main shaft and bearing is difficult, very
To the damage for causing the two mating surface；And the magnitude of interference choose it is too small can cause releasing for main shaft and bearing, cause mating surface to be beaten
It is sliding, the problems such as causing shafting vibration, temperature rise increase.Therefore, it is necessary to be carried out to the quantitative selection of main shaft and the bearing inner race magnitude of interference
Research.
More it is short of in terms of spindle rotor with the experimental provision and testing research of the bearing inner race magnitude of interference at present, lacks pin
To the experimental provision of magnitude of interference shaft performance impact analysis, it is difficult to which the affecting laws for changing shaft performance to the magnitude of interference are carried out
System research.
The content of the invention
It is an object of the invention to provide a kind of bearing magnitude of interference to the research experiment device of axis system performance impact and
Measuring method.
To achieve these goals, present invention employs following technical scheme：
A kind of bearing magnitude of interference to the research experiment device of axis system performance impact, the experimental provision include electro spindle,
Bearing block, magnitude of interference experiment main shaft and the detection module for testing axis system performance, the magnitude of interference are tested on main shaft
A pair of angular contact ball bearings installed back-to-back are provided with, magnitude of interference experiment main shaft passes through the pair of corner connection installed back-to-back
Tactile ball bearing is supported in bearing block, and the side of the pair of angular contact ball bearing installed back-to-back is provided with and magnitude of interference reality
The connected locking nut of main shaft is tested, the detachable end being connected with one end of bearing block, institute are provided with the outside of locking nut
End cap and locking nut are stated respectively from one end of the bearing block to the pair of angular contact ball bearing installed back-to-back
Outer ring and inner ring are held out against, and the opposite side of the pair of angular contact ball bearing installed back-to-back is provided with and magnitude of interference reality
Test the connected spacer ring of main shaft, one end of spacer ring and the shaft shoulder being arranged on magnitude of interference experiment main shaft contact, the other end of spacer ring and
The inner ring contact of the pair of angular contact ball bearing installed back-to-back, it is arranged at the shoulder block and described one of the other end of bearing block
The outer ring of angular contact ball bearing to installing back-to-back is contacted, and one end of magnitude of interference experiment main shaft is provided with for connecting electro spindle
Flange, the magnitude of interference experiment main shaft the other end be provided with for the magnitude of interference experiment main shaft apply radial load hydraulic cylinder or power
Hammer, micron is provided between magnitude of interference experiment main shaft and the inner ring mating surface of the pair of angular contact ball bearing installed back-to-back
Level shim liner, in order to simplify axis system structure, excludes the influence of other assembly parameter shaft performances, experiment main axis length compared with
Short, axle upper-part mainly includes angular contact ball bearing, a locking nut and a spacer ring for a pair of back-to-back form installations, and
Required when testing main shaft and being installed with bearing according to the different size of magnitude of interference, it is replaceable in the installing positions of bearings of experiment main shaft
Using the micrometre grade thin pad of different-thickness, make the magnitude of interference of main shaft and bearing in axis system variable.
The axis system performance test that the experimental provision can be carried out includes Static stiffness test, shafting rotating accuracy is surveyed
Examination, characteristics of mode test, vibration-testing and bearing temperature test.
The detection module includes temperature sensor, three-dimensional acceleration transducer, capacitance displacement sensor and amesdial；
Two through holes are radially offered on bearing block, temperature sensor is respectively arranged with two through holes, before being easy to directly test
Temperature rise at latter two bearing；Three-dimensional acceleration transducer, which is arranged on bearing block top, (is used for test experiments spindle operation mistake
Shafting vibration situation in journey) or be arranged on magnitude of interference experiment main shaft, three-dimensional acceleration transducer is led with magnitude of interference experiment
The contact point of axle is located at the offside that power hammer tests main shaft beating point to the magnitude of interference；The shaft part of magnitude of interference experiment main shaft is circumferentially set
Three capacitance displacement sensors are equipped with, for testing shafting rotating accuracy；The contact point position of amesdial and magnitude of interference experiment main shaft
In the hydraulic cylinder and the offside of the contact point of magnitude of interference experiment main shaft.
The experimental provision also includes cast iron platform and the support being connected with bearing block, will according to the specific test of experiment
Ask, bearing block is arranged on cast iron platform relevant position by the support, and electro spindle and hydraulic cylinder are arranged on cast iron platform
On.
The spacer ring is stepped, gap is left between the circumference and bearing block of spacer ring, locking nut is used for axially position
On the one hand the angular contact ball bearing, spacer ring can lock nut and carry out pretension to bearing, on the other hand play auxiliary and tear open
Unload the effect of bearing.
It is cageless between two bearings of the pair of angular contact ball bearing installed back-to-back.
A kind of bearing magnitude of interference pair based on the above-mentioned bearing magnitude of interference to the research experiment device of axis system performance impact
The measuring method of axis system performance impact, comprises the following steps：
By the cooperation that main shaft and the pair of angular contact ball bearing inner ring installed back-to-back are tested in the magnitude of interference
Change the magnitude of interference experiment main shaft and the pair of installation back-to-back between face using the micrometre grade thin pad of different-thickness
Angular contact ball bearing between magnitude of interference size, then test main shaft in the magnitude of interference using the electro spindle or hydraulic cylinder
End applies axial load or radial load with analog main shaft machining operating mode, then tests different magnitude of interference lower main axis systems
Static stiffness, rotating accuracy, bearing temperature rise and vibration, meanwhile, using the power hammer by hammering method test correspondence the magnitude of interference under
The characteristics of mode of axis system, so as to obtain rule of the bearing magnitude of interference to axis system performance impact.
When changing the magnitude of interference size, first the end cap is opened, then dismantles the locking nut, then using bearing
Drawbench along magnitude of interference experiment main shaft ejection bearing block, then changes the pair of angular contact ball bearing installed back-to-back not
The micrometre grade thin pad of stack pile, the micrometre grade thin pad absorption after replacing is on magnitude of interference experiment main shaft, then in conjunction with hot charging
Bearing block is returned in the pair of angular contact ball bearing top installed back-to-back by method, then reinstalls the locking nut and end
Lid；Or when changing the magnitude of interference size, first open the end cap, then the locking nut is dismantled, then directly by axle
Bearing is taken apart, is then taken out magnitude of interference experiment main shaft in the lump with the pair of angular contact ball bearing installed back-to-back, then
The pair of angular contact ball bearing installed back-to-back is separated with magnitude of interference experiment main shaft, then changes the micron of different-thickness
Level shim liner, the micrometre grade thin pad absorption after replacing, then will be the pair of using hot charge practice on magnitude of interference experiment main shaft
The angular contact ball bearing installed back-to-back is reinstalled to magnitude of interference experiment main shaft, is then reinstalled bearing block and is installed the lock
Tight nut and end cap.
In the Static stiffness test, the radial displacement of magnitude of interference experiment main shaft is obtained by amesdial measurement, is surveyed with amesdial
The relative loading force in amount direction is provided by the hydraulic cylinder；In the rotating accuracy test, electro spindle drive shaft system is utilized
Operating, the radial displacement of magnitude of interference experiment main shaft is measured in axis system operation process using three capacitance displacement sensors,
And measurement data is analyzed and processed using line-of-sight course, obtain the rotating accuracy of axis system；In the bearing temperature rise test,
By two through holes being opened up on bearing block by the outer of temperature sensor and the pair of angular contact ball bearing installed back-to-back
Circle contact, so as to measure the temperature rise of bearing outer ring in real time；In the vibration-testing, operated using electro spindle drive shaft system,
The vibration signal of axis system operation process is obtained by the three-dimensional acceleration transducer on bearing block top, by shaking
Dynamic signal is handled, and obtains the vibration amplitude and vibration frequency of axis system；In the characteristics of mode test, using described
Power hammers the offside in three-dimensional acceleration transducer into shape to magnitude of interference experiment main shaft progress radial direction percussion, and passes through LMS data acquisitions system
System obtains power hammer excitation signal and acceleration transducer response signal, by data analysis, obtains the frequency response of axis system
Function；By changing the position of three-dimensional acceleration transducer, the frequency response function of axis system difference is obtained, is then used
Lumped-parameter method obtains the intrinsic frequency and Mode Shape of axis system.
Beneficial effects of the present invention are embodied in：
Main shaft upper-part is tested in the present invention mainly includes the angular contact ball bearing of a pair of back-to-back form installations, a lock
Tight nut and a spacer ring, the magnitude of interference of bearing inner race and main shaft can be conveniently adjusted, be the quantitative calculating of the magnitude of interference
Or optimization design provides experiment test device, contribute to the Rational choice of bearing and main shaft work-in parameters, avoid traditional profit
Determine that the problems of bearing magnitude of interference, such as main shaft performance can not reach optimization with experience.The present invention can be to not
Comprehensively and accurately performance test, including axis system Static stiffness, bearing outer ring temperature are carried out with the axis system in the case of the magnitude of interference
Degree, shafting rotating accuracy, spindle vibration, intrinsic frequency etc., test result can be affecting laws of the magnitude of interference to axis system
Research provides reference.
Brief description of the drawings
Fig. 1 is main shaft bearing magnitude of interference test main axle structure schematic diagram；
Fig. 2 is main shaft bearing magnitude of interference experiment test system schematic diagram；
Fig. 3 is that main shaft changes schematic diagram with the bearing inner race magnitude of interference；
Fig. 4 is different magnitude of interference lower main axis system Static stiffness test schematic diagrams；Wherein：A is stereogram；Before b is a main shaft
End-view；
Fig. 5 is different magnitude of interference lower main axis system rotating accuracy test schematic diagrams；
Fig. 6 is different magnitude of interference lower main axis system mode characteristic test schematic diagrames；
Fig. 7 is different magnitude of interference lower main axis system vibration test schematic diagrams；
Fig. 8 is different magnitude of interference lower main axis system bearings temperature test schematic diagrames；Wherein：A is stereogram；B is a section view
Figure；
In figure：The 1- magnitudes of interference test main shaft；2- locking nuts；3- end caps；4- screws；5- bearing blocks；6- angular contact ball axles
Hold；7- spacer rings；8- cast iron platforms；9- supports；10- electro spindles；11- micrometre grade thin pads；12- amesdials；13- hydraulic cylinders；14-
Capacitance displacement sensor；15- three-dimensional acceleration transducers；16- temperature sensors；17- flanges.
Embodiment
The present invention is elaborated with reference to the accompanying drawings and examples.
The present invention provides research experiment device and measuring method of a kind of bearing magnitude of interference to axis system performance impact, leads to
Cross and changed between main shaft and the mating surface of bearing inner race using the micrometre grade thin pad of different-thickness between main shaft and bearing
Magnitude of interference size.Apply axial load, radial load analog main shaft machining operating mode in spindle nose, test different interference
Static stiffness, rotating accuracy, temperature rise and the vibration of lower main axis system are measured, and axis system characteristics of mode is tested by hammering method.
As depicted in figs. 1 and 2, the bearing magnitude of interference is to the research experiment device of axis system performance impact, including with
Lower module：Cast iron platform 8, driving electro spindle 10 and its servo drive system and lubricating and cooling system, tests axis system, axle
To loading system (electro spindle 10), radial loaded system (hydraulic cylinder 13 and power hammer) and axis system Performance Test System
(including corresponding sensor).
(1) main shaft is arranged on cast iron platform 8 with the test of bearing value of interference fit with experiment main shaft (test axis system),
Test axis system includes following parts：1,2 angular contact ball bearing 6 of magnitude of interference experiment main shaft, spacer ring 7, bearing block 5, lock
Tight nut 2 and end cap 3.Its assembly relation is as follows：The Bearing configuration of magnitude of interference experiment main shaft 1 is carried on the back from simplest two supports
The Bearing configuration form of backrest, to eliminate as much as other influences of assembling factor to value of interference fit (magnitude of interference).Nose angle
Using having stepped short spacer ring 7, (inside diameter is small, outside diameter between contact ball bearing 6 and the magnitude of interference experiment shaft shoulder of main shaft 1
Greatly, gap be present with bearing block), the bearing removal being easy in experimentation.2 angular contact ball bearings 6 are led with magnitude of interference experiment
Axle 1 is fixed by the locking nut 2 of rear end, forms spindle bearing system part, spindle bearing system part is installed to
In bearing block 5 (generally horizontal installation), it is fixed by the end cap 3 of the rear end of bearing block 5, and is tightened with screw 4, so as to is formed
The test axis system, magnitude of interference experiment main shaft 1 rear end has flange 17, for being connected with the front end flange of electro spindle 10.
(2) in order to test axis system performance, respective sensor is arranged on experimental provision.It is specific to be described in detail such as
Under：Two apertures for being used for mounting temperature sensor 16, corresponding two corner connections of axial location in hole are radially provided with bearing block 5
Center of the ball bearing 6 on width (axial direction) is touched, is easy to the temperature rise situation at angular contact ball bearing before and after directly testing；
The shaft part of magnitude of interference experiment main shaft 1 front end circumferentially three capacitance displacement sensors 14, match somebody with somebody for measuring different interference
Shafting rotating accuracy under resultant；The top of bearing block 5 can install three-dimensional acceleration transducer 15, for testing different interference fits
The shafting vibration situation in lower main axis system operation process is measured, the three-dimensional acceleration transducer 15 can also be provided at magnitude of interference experiment
On the front end diverse location of main shaft 1, the radial direction that coordinate force hammer tests main shaft 1 to the magnitude of interference taps, and realizes the mode such as intrinsic frequency spy
The test of property；The also settable amesdial 12 in magnitude of interference experiment main shaft 1 front end, coordinates with hydraulic cylinder 13, realizes that Static stiffness is tested.Always
It, whole experimental provision can carry out axis system Static stiffness, bearing outer ring temperature, shafting rotating accuracy, spindle vibration, intrinsic
The performance tests such as frequency.
In order to realize, the magnitude of interference of main shaft and angular contact ball bearing 6 is variable in axis system, in installation process, according to reality
Border experiment test uses the micrometre grade thin of different-thickness to the demand of the magnitude of interference between main shaft and the inner ring of angular contact ball bearing 6
Pad 11, as shown in Figure 3.In experimentation, the micrometre grade thin pad 11 of different-thickness need to be changed, to realize angular contact ball axle
Hold 6 value of interference fit different from main shaft.Its specific dismounting mode is as follows：During assembling, a pair of (2) angular contact ball bearings
6 installation form on magnitude of interference experiment main shaft 1 is back-to-back, by testing circumferentially wound micron order on main shaft 1 in the magnitude of interference
Shim liner (using aviation kerosine absorption on main shaft), then 2 angular contact ball bearings 6 are led in the form of hot charging with magnitude of interference experiment
Axle 1 is assembled, and 2 angular contact ball bearings 6 are axially fixed in into the magnitude of interference by locking nut 2 and tested on main shaft 1, micron
Level shim liner 11 is located between the mating surface of angular contact ball bearing 6 and magnitude of interference experiment main shaft 1, forms spindle bearing system portion
Part.Spindle bearing system part is integrally loaded into bearing block 5, and positioned in axial direction with the shoulder block of bearing block front end, finally
Compressed in rear end using end cap 3, and fixation is tightened with screw 4.When needing to change the magnitude of interference, first rear end end cap 3 is opened, then
Locking nut 2 is dismantled, then 2 angular contact ball bearings 6 are ejected using bearing puller, change the micrometre grade thin of different-thickness
Pad 11, and then assembling process is repeated, so as to change the pad of different-thickness, to reach different magnitude of interference lower axles in experimentation
It is the testing requirement of performance.
In axis system Static stiffness test process, as shown in figure 4, testing the front end of main shaft 1 to the magnitude of interference using hydraulic cylinder 13
Shaft part carries out the application of radial load, while the amesdial 12 by testing the front end of main shaft 1 installed in the magnitude of interference measures the main shaft
Radial displacement.According to the radial displacement of measured magnitude of interference experiment main shaft 1 and the radial direction applying power read, main shaft system is carried out
The calculating of system Static stiffness.Carry out repeatedly test to average, obtain the Static stiffness of axis system.According to experiment needs, to difference
Shafting Static stiffness under the magnitude of interference is tested, and obtains the affecting laws of magnitude of interference shaft Static stiffness.
In axis system rotating accuracy test process, as shown in figure 5, (by electro spindle 10 in axis system operation process
Driving), the magnitude of interference experiment front end radial displacement of main shaft 1 is tested using capacitance displacement sensor 14.Three capacitive displacements
Sensor arrangement tests the circumferential position of the front end shaft part of main shaft 1 in the magnitude of interference, is gathered in real time by data actuation and records interference
Measured data are finally analyzed and processed, obtain different interference by the radial displacement of amount experiment main shaft 1 front end using line-of-sight course
Shafting rotating accuracy in the case of amount.
In axis system characteristics of mode test process, as shown in fig. 6, three-dimensional acceleration transducer 15 was arranged on first
The amount of being full of experiment main shaft 1 front end, magnitude of interference experiment main shaft 1 is carried out radially using offside of the power hammer in three-dimensional acceleration transducer 15
Tap, the response signal of power hammer excitation signal and acceleration transducer is collected by LMS data collecting systems, passes through data
Analysis, obtains the frequency response function of axis system；And then test master in the magnitude of interference by changing three-dimensional acceleration transducer 15
Position on axle 1, repeat frequency response function measurement, the response of magnitude of interference experiment main shaft 1 difference can be obtained, then
Using lumped-parameter method, the intrinsic frequency and Mode Shape of axis system can be obtained.According to experiment needs, to the different magnitudes of interference
Under shafting characteristics of mode tested, obtain the affecting laws of magnitude of interference shaft characteristics of mode.
In spindle system vibration test process, as shown in fig. 7, in axis system operation process, by installed in bearing
Three-dimensional acceleration transducer 15 on seat 5 obtains the vibration signal of axis system, includes the axial vibration of magnitude of interference experiment main shaft 1
With two orthogonal radial vibration signals.By being carried out to the vibration signal gathered in the case of the different magnitudes of interference at analysis
Reason, the vibration amplitude and vibration frequency situation of axis system in the case of the different magnitudes of interference can be obtained, it is hereby achieved that mistake
The amount of being full of is to the vibration amplitude of axis system and the affecting laws situation of vibration frequency.
During bearing outer ring temperature test, as shown in figure 8, two temperature sensors 16 are separately mounted into bearing block 5
On in two apertures opening up, temperature sensor can directly contact with the outer ring of two angular contact ball bearings 6, in axis system
In operation process, the temperature rise situation recorded in the case of the different magnitudes of interference at axis system bearing can be measured in real time, obtains interference
Measure the affecting laws of shaft temperature.
Claims (9)
1. a kind of bearing magnitude of interference is to the research experiment device of axis system performance impact, it is characterised in that：The experimental provision bag
Include electro spindle（10）, bearing block（5）, the magnitude of interference experiment main shaft（1）And for testing the detection module of axis system performance, institute
State magnitude of interference experiment main shaft（1）On be provided with a pair of angular contact ball bearings installed back-to-back（6）, magnitude of interference experiment main shaft（1）
Pass through the pair of angular contact ball bearing installed back-to-back（6）It is supported in bearing block（5）It is interior, it is the pair of back-to-back to install
Angular contact ball bearing（6）Side be provided with and the magnitude of interference experiment main shaft（1）Connected locking nut（2）, locking nut（2）'s
Outside is provided with and bearing block（5）The connected detachable end in one end（3）, the end cap（3）And locking nut（2）Point
Not from the bearing block（5）One end to the pair of angular contact ball bearing installed back-to-back（6）Outer ring and inner ring enter
Row is held out against, the pair of angular contact ball bearing installed back-to-back（6）Opposite side be provided with and the magnitude of interference experiment main shaft（1）Phase
Spacer ring even（7）, spacer ring（7）One end and be arranged at the magnitude of interference experiment main shaft（1）On the shaft shoulder contact, spacer ring（7）It is another
End and the pair of angular contact ball bearing installed back-to-back（6）Inner ring contact, be arranged at bearing block（5）The other end gear
Shoulder and the pair of angular contact ball bearing installed back-to-back（6）Outer ring contact, the magnitude of interference experiment main shaft（1）One end set
Have for connecting electro spindle（10）Flange（17）, magnitude of interference experiment main shaft（1）The other end be provided with for real to the magnitude of interference
Test main shaft（1）Apply the hydraulic cylinder of radial load（13）And power hammer, magnitude of interference experiment main shaft（1）Back-to-back installed with the pair of
Angular contact ball bearing（6）Inner ring mating surface between be provided with micrometre grade thin pad（11）.
2. a kind of bearing magnitude of interference is to the research experiment device of axis system performance impact, its feature according to claim 1
It is：The axis system performance test that the experimental provision is carried out includes Static stiffness test, the test of shafting rotating accuracy, mode spy
Property test, vibration-testing and bearing temperature test.
3. a kind of bearing magnitude of interference is to the research experiment device of axis system performance impact, its feature according to claim 1
It is：The detection module includes temperature sensor（16）, three-dimensional acceleration transducer（15）, capacitance displacement sensor（14）With
And amesdial（12）；In bearing block（5）On radially offer two through holes, be respectively arranged with temperature sensor in two through holes
（16）；Three-dimensional acceleration transducer（15）It is arranged at bearing block（5）On top or be arranged at the magnitude of interference experiment main shaft（1）On,
Three-dimensional acceleration transducer（15）Main shaft is tested with the magnitude of interference（1）Contact point be located at the power hammer to the magnitude of interference test main shaft
（1）The offside of beating point；The magnitude of interference tests main shaft（1）Shaft part be circumferentially provided with three capacitance displacement sensors（14）；Thousand points
Table（12）Main shaft is tested with the magnitude of interference（1）Contact point be located at the hydraulic cylinder（13）Main shaft is tested with the magnitude of interference（1）Contact
The offside of point.
4. a kind of bearing magnitude of interference is to the research experiment device of axis system performance impact, its feature according to claim 1
It is：The experimental provision also includes cast iron platform（8）And and bearing block（5）Connected support（9）, the support（9）, electricity
Main shaft（10）And hydraulic cylinder（13）It is arranged on cast iron platform（8）On.
5. a kind of bearing magnitude of interference is to the research experiment device of axis system performance impact, its feature according to claim 1
It is：The spacer ring（7）To be stepped, spacer ring（7）Circumference and bearing block（5）Between leave gap.
6. a kind of bearing magnitude of interference is to the research experiment device of axis system performance impact, its feature according to claim 1
It is：The pair of angular contact ball bearing installed back-to-back（6）Between it is cageless.
A kind of 7. bearing mistake based on the bearing magnitude of interference described in claim 1 to the research experiment device of axis system performance impact
Measuring method of the amount of being full of to axis system performance impact, it is characterised in that：Comprise the following steps：
By testing main shaft in the magnitude of interference（1）With the pair of angular contact ball bearing installed back-to-back（6）Inner ring is matched somebody with somebody
The micrometre grade thin pad of different-thickness is used between conjunction face（11）To change the magnitude of interference experiment main shaft（1）With the pair of back of the body
The angular contact ball bearing of backrest installation（6）Between magnitude of interference size, then utilize the electro spindle（10）In the magnitude of interference
Test main shaft（1）End applies axial load or utilizes hydraulic cylinder（13）Main shaft is tested in the magnitude of interference（1）End applies footpath
To load with analog main shaft machining operating mode, Static stiffness, rotating accuracy, the axle of different magnitude of interference lower main axis systems are then tested
Temperature rise and vibration are held, meanwhile, the characteristics of mode for corresponding to magnitude of interference lower main axis system is tested by hammering method using power hammer, from
And obtain rule of the bearing magnitude of interference to axis system performance impact.
8. according to the method for claim 7, it is characterised in that：When changing the magnitude of interference size, first by the end cap（3）
Open, then dismantle the locking nut（2）, then using bearing puller by the pair of angular contact ball axle installed back-to-back
Hold（6）Main shaft is tested along the magnitude of interference（1）Eject bearing block（5）, then change different-thickness micrometre grade thin pad（11）, change
Micrometre grade thin pad afterwards（11）Absorption tests main shaft in the magnitude of interference（1）On, will be the pair of back-to-back then in conjunction with hot charge practice
The angular contact ball bearing of installation（6）Push up back bearing block（5）, then reinstall the locking nut（2）And end cap（3）；Or
Person, when changing the magnitude of interference size, first by the end cap（3）Open, then dismantle the locking nut（2）, then directly will
Bearing block（5）Take apart, the magnitude of interference is then tested into main shaft（1）With the pair of angular contact ball bearing installed back-to-back（6）One
And take out, then by the pair of angular contact ball bearing installed back-to-back（6）Main shaft is tested with the magnitude of interference（1）Separation, then
Change the micrometre grade thin pad of different-thickness（11）, the micrometre grade thin pad after replacing（11）Absorption tests main shaft in the magnitude of interference
（1）On, then using hot charge practice by the pair of angular contact ball bearing installed back-to-back（6）Reinstall to the magnitude of interference and test main shaft
（1）On, then it is reinstalled bearing block（5）And the locking nut is installed（2）And end cap（3）.
9. according to the method for claim 7, it is characterised in that：In Static stiffness test, magnitude of interference experiment main shaft（1）Radial direction
Displacement is by amesdial（12）Measurement obtains, with amesdial（12）The relative loading force of measurement direction is by the hydraulic cylinder（13）Carry
For；In rotating accuracy test, electro spindle is utilized（10）Drive shaft system operates, and uses three capacitance displacement sensors（14）
Magnitude of interference experiment main shaft is measured in axis system operation process（1）Radial displacement, and using line-of-sight course to measurement data carry out
Analyzing and processing, obtains the rotating accuracy of axis system；In bearing temperature rise test, by two through holes being opened up on bearing block by temperature
Spend sensor（16）With the pair of angular contact ball bearing installed back-to-back（6）Outer ring contact, so as to measuring bearing in real time
The temperature rise of outer ring；In vibration-testing, electro spindle is utilized（10）Drive shaft system operates, the vibration letter of axis system operation process
Number by installed in bearing block（5）Three-dimensional acceleration transducer on top（15）Obtain, by handling vibration signal, obtain
To the vibration amplitude and vibration frequency of axis system；In characteristics of mode test, hammered into shape using the power in three-dimensional acceleration sensing
Device（15）Offside to the magnitude of interference test main shaft（1）Radial direction percussion is carried out, and power hammer excitation is obtained by LMS data collecting systems
Signal and acceleration transducer response signal, by data analysis, obtain the frequency response function of axis system；By changing three
To acceleration transducer（15）Position, the frequency response function of axis system difference is obtained, then using lumped-parameter method
Obtain the intrinsic frequency and Mode Shape of axis system.
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| CN108931167A (en) * | 2017-05-23 | 2018-12-04 | 鼎奇(天津)主轴科技有限公司 | The measurement method of main shaft bearing spacer ring precision |
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