CN105021390A - Numerical control machine tool main shaft unit static stiffness testing apparatus and test method - Google Patents
Numerical control machine tool main shaft unit static stiffness testing apparatus and test method Download PDFInfo
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- CN105021390A CN105021390A CN201510452282.3A CN201510452282A CN105021390A CN 105021390 A CN105021390 A CN 105021390A CN 201510452282 A CN201510452282 A CN 201510452282A CN 105021390 A CN105021390 A CN 105021390A
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Abstract
The invention discloses a numerical control machine tool main shaft unit static stiffness testing apparatus and a test method. Three groups of loading apparatuses that have the same structure for clamping the examination rod of the numerical control machine tool main shaft and applying force to the examination rod are set on a pedestal; the examination rod has a capacitance displacement sensor; the main bodies of the three groups of loading apparatuses are set in the pedestal respectively; among the three groups of loading apparatuses, the push rod at the front end for clamping the examination rod extends outside the pedestal, and the push rods of the three groups of loading apparatuses extend out of the pedestal along X direction, Y direction and Z direction respectively; a voltage amplifier electrically connected to the three groups of loading apparatus and an NI data collection card respectively electrically connected to the voltage amplifier, the capacitance displacement sensor and the three groups of loading apparatuses are set on the pedestal; and the voltage amplifier is connected to an outside power supply. By means of the powerful storage and operation function of the computer, the collected displacement and force data are used for curve fitting by the computer, and a force-displacement static stiffness curve is drawn, therefore, the test method is suitable for static stiffness test for various vertical or horizontal numerical control machine tool main shaft units.
Description
Technical field
The present invention relates to a kind of Performance Test System of numerically-controlled machine.Particularly relate to a kind of main shaft of numerical control machine tool unit Static stiffness proving installation and method of testing.
Background technology
The Static stiffness of main shaft of numerical control machine tool unit refers to the ability of main axle unit resistance to deformation under the effect of cutting force, when usually producing unit displacement with front-end of spindle, the acting force that sense of displacement applies is to represent the important indicator of the Static stiffness of main shaft as evaluation numerically-controlled machine overall mass, also be the important indicator of main shaft of numerical control machine tool design, not only can reflect the vibration resistance and stability etc. of main axle unit, the static properties of main shaft of numerical control machine tool can affect its dynamic perfromance, the static deformation of the main shaft of numerical control machine tool under the effect of permanent load and self gravitation not only can change the geometric accuracy of parts, reduce crudy, also be prediction main shaft dynamic perfromance, the basis of bearing life and noise.
Main shaft of numerical control machine tool unit static angular rigidity testing system mainly comprises cutting force analog loading device, loading force detects, main shaft stress deformation detects, data acquisition and procession, the research work of the basic theories such as Spindle Static stiffness curve display and experimental technique aspect, have the research that some scholars are correlated with excessively at present both at home and abroad, also have and much deliver about the achievement in research of the method for testing of machine tool and numerically-controlled machine Static stiffness and document, but the method for testing developed for the complete machine Static stiffness of numerically-controlled machine in these achievements adopts hydraulic pressure or spiral load mode mostly, and can only measure in a single direction, radial and axially to load and the test macro measured is few simultaneously, after these proving installations are tested in one direction and are terminated, need to reinstall debugging, another direction of aptitude test, bring inconvenience to so obviously actual test job, there is significant limitation, although other achievements in research can survey three direction Static stiffness simultaneously, but its test macro is mostly hydraulic pressure or spiral load mode, easy generation reveal or loading force inadequate, and the research of a large amount of scholar only rests in scheme conception or test.
Summary of the invention
Technical matters to be solved by this invention is, provides one to load three directions simultaneously, and measures main shaft of numerical control machine tool unit Static stiffness proving installation and the method for testing of displacement and power size simultaneously.
The technical solution adopted in the present invention is: a kind of main shaft of numerical control machine tool unit Static stiffness proving installation, include base, described base is provided with the identical check rod for clamping test main shaft of numerical control machine tool of three groups of structures and stressed charger is executed to described check rod, described check rod is provided with capacitance displacement sensor, the main body of described three groups of chargers lays respectively in described base, front end extend out to described base outside for the push rod clamping check rod is positioned in described three groups of chargers, and the push rod of three groups of chargers is respectively in X direction, Y-direction and Z-direction stretch out described base, also be provided with electrical connection three groups of chargers for described three groups of chargers are executed alive voltage amplifier and respectively with described voltage amplifier, the NI data collecting card of capacitance displacement sensor and three groups of charger electrical connections, described voltage amplifier connects external power source.
On described base, three push rods of corresponding described protuberate basic unit respectively in X direction, Y-direction and Z-direction have three for installing the through hole of the identical charger main part of three groups of structures respectively.
Arbitrary group in three groups of described chargers includes: along the through hole in base by the rear extremely front pressure transducer contacting connection successively, piezoelectric ceramics bedplate, piezoelectric ceramics spacer and push rod, and the piezoelectric ceramics be arranged in described piezoelectric ceramics spacer and the back-moving spring be enclosed within successively on described push rod and back-moving spring pad, wherein, the bottom of described push rod connects for contacting with described piezoelectric ceramics, on described base, the rear port of through hole is provided with rear end cap by bolt, described rear end cap has the cable-through hole for running through power lead and data conductor, on described base, the front port of through hole is provided with front end end cover by bolt, the center that described front end end cover is run through on the top of described push rod extend out to the outside of described base, described pressure transducer electrical connection NI data collecting card.
Described push rod is T-type structure, this one side of the piezoelectric ceramics described in the correspondence of horizontal ends face of T-type structure is formed with the location counterbore for connect with positioning and voltage ceramic front end equal with described piezoelectric ceramics quantity, the center that the vertical component of T-type structure runs through described front end end cover extend out to the outside of described base, and described back-moving spring and back-moving spring pad are enclosed within the vertical component of T-type structure.
On the push rod of the charger in X-direction and Y-direction for the front end clamping check rod be formed be inwardly recessed can with the groove of check rod tight connecting, the front end for clamping check rod on the push rod of the charger of Z-direction is formed with the outwardly plush copper for withstanding check rod.
Circumferentially equally spacedly on the side that described piezoelectric ceramics bedplate is positioned at described piezoelectric ceramics be formed with the locating slot that can insert described piezoelectric ceramics bottom equal with described piezoelectric ceramics quantity, the side that described piezoelectric ceramics bedplate is positioned at described pressure transducer has can the pilot hole of gauge head of embedment pressure sensor.
Described capacitance displacement sensor is provided with three on check rod, is to be separately positioned in the X-direction of check rod, Y-direction and Z-direction.
Also be provided with computing machine, described computing machine is connected with described NI data collecting card, the data of exerting pressure to check rod that the displacement data being obtained the check rod that capacitance displacement sensor collects by NI data collecting card is collected with acquisition pressure transducer, described computing machine is also connected with the display of the Static stiffness curve of the power-displacement of the carrying for showing check rod.
The method of testing of main shaft of numerical control machine tool unit Static stiffness proving installation of the present invention, comprises the steps:
1) check rod is applied to X-direction, Y-direction and Z-direction loading force loading velocity to main shaft of numerical control machine tool is arranged through on computers respectively:
2) computing machine sends control signal to NI data collecting card;
3) voltage amplifier that NI data collecting card connects external power source by the D/A port controlling of self applies voltage to the piezoelectric ceramics in charger;
4) piezoelectric ceramics applies loading force by the push rod pair check rod be connected with tested main shaft of numerical control machine tool, thus makes main shaft produce deflection;
5) computing machine gathers the pressure signal F on check rod that the pressure transducer in three chargers measures respectively by NI data collecting card, and computing machine is by the NI data collecting card check rod displacement signal △ X that measures of the capacitance displacement sensor of capture setting in the X-direction of check rod, Y-direction and Z-direction respectively, and the pressure signal F collected described in storing and displacement signal △ X, include the pressure F of back-moving spring in the pressure signal F measured
t;
6) computing machine is according to Static stiffness value formula F
t=K
tfirst △ X calculates the pressure F of spring
t, wherein K
tfor the rigidity value of known back-moving spring, then by formula F
s=F-F
tcalculate the pressure of main shaft, and carry out curve fitting, draw out the Static stiffness curve of the power-displacement of main shaft, then according to formula
carry out the Static stiffness value calculating main shaft;
7) the Static stiffness value K on the Static stiffness curve of power-displacement and correspondence direction is shown by display
s;
8) in test process, judge whether test completes at any time, if tested, then reduce loading force gradually, spindle deformation also diminishes gradually, and recovering virgin state, back-moving spring plays the effect of reset, push rod and piezoelectric ceramics, piezoelectric ceramics and piezoelectric ceramics bedplate, piezoelectric ceramics bedplate is remained with pressure transducer and contacts; If continue test, then return step 2) proceed
Main shaft of numerical control machine tool unit Static stiffness proving installation of the present invention and method of testing, can load three directions simultaneously, and measure the size of displacement and power simultaneously, be applicable to all kinds of Static stiffness that is vertical, horizontal digital-control For Spindle Unit of Machine Tool and test, versatility is good.There is following effect:
1) adopt the charger based on piezoelectric ceramics to load, load continuous and stable, loading force is large, and response is fast, compared with traditional hydraulic loading device, there is no the leakage of oil, sealing need not be considered, and three directions can be realized load simultaneously, install easy to carry, improve loading efficiency;
2) X-direction push rod and Y-direction push rod Front-end Design are groove structure, can closely cooperate with check rod, can keeping the directivity loaded, also steadily can load it when not locking main shaft in loading procedure;
3) capacitance displacement sensor is adopted to carry out the measurement of spindle deformation amount, more traditional clock gauge is more accurate, adopts pressure transducer to measure the size of loading force, measures simultaneously to displacement and power, can automatically draw out Static stiffness curve, automaticity is higher.
Accompanying drawing explanation
Fig. 1 is the external structure schematic diagram of main shaft of numerical control machine tool unit Static stiffness proving installation of the present invention;
Fig. 2 is the structural representation of the right part of Fig. 1;
Fig. 3 is the vertical view of Fig. 1;
Fig. 4 is the A-A cut-open view of Fig. 3;
Fig. 5 is the one-piece construction schematic diagram of charger in the present invention;
Fig. 6 is main shaft of numerical control machine tool unit Static stiffness proving installation course of action schematic diagram of the present invention;
Fig. 7 is the process flow diagram of method of testing of the present invention.
In figure
1: base 2: check rod
3: main shaft 4: charger
5: voltage amplifier 6:NI data collecting card
7: capacitance displacement sensor 8: computing machine
9: display 11: through hole
41: push rod 41a: groove
41b: plush copper 42: back-moving spring
43: piezoelectric ceramics spacer 44: piezoelectric ceramics
45: piezoelectric ceramics bedplate 46: pressure transducer
47: rear end cap 48: front end end cover
49: back-moving spring pad 50: cable-through hole
Embodiment
Below in conjunction with embodiment and accompanying drawing, main shaft of numerical control machine tool unit Static stiffness proving installation of the present invention and method of testing are described in detail.
As shown in Figure 1, Figure 2, Figure 3, Figure 4, main shaft of numerical control machine tool unit Static stiffness proving installation of the present invention, includes base 1, there is open slot on the base of base 1, is fixed on the worktable of numerically-controlled machine by bolt.Described base 1 is provided with the identical check rod 2 for clamping test main shaft of numerical control machine tool 3 of three groups of structures and stressed charger 4 is executed to described check rod 2.Described check rod 2 is circular cone check rod, and model is BT50/BT40.BT50/BT40 check rod manufactures according to JB/T9981-99 specification, for checking the geometric accuracy of all kinds of lathe, employing Fine Steel Casting iron manufactures, through repeatedly thermal treatment in processing, workplace fine grinding forms, it is textural enough rigidity, and band specification taper shank lathe check rod material is CRWMN or T10A, and barred body thermal treatment is C59.Described check rod 2 is provided with capacitance displacement sensor 7, the main body of described three groups of chargers 4 lays respectively in described base 1, front end extend out to described base 1 outside for the push rod 41 clamping check rod 2 is positioned in described three groups of chargers 4, and the push rod 41 of three groups of chargers 4 is respectively in X direction, Y-direction and Z-direction stretch out described base 1, also be provided with electrical connection three groups of chargers 4 for described three groups of chargers 4 are executed alive voltage amplifier 5 and respectively with described voltage amplifier 5, the NI data collecting card 6 that capacitance displacement sensor 7 and three groups of chargers 4 are electrically connected, described NI data collecting card 6 can adopt model to be the data collecting card of NI USB 6351/6353 or NI USB6251.Described voltage amplifier 5 connects external power source, the faint simulating signal of input can be zoomed into the voltage that can drive described piezoelectric ceramics 44, and then make piezoelectric ceramics 44 produce loading force.
Voltage amplifier of the present invention can adopt model to be the voltage amplifier of PI E-505.00
On described base 1, three push rods 41 of corresponding described protuberate basic unit 1 respectively in X direction, Y-direction and Z-direction have three for installing the through hole 11 of identical charger 4 main part of three groups of structures respectively.
As shown in Figure 5, arbitrary group in three groups of described chargers 4 includes: along the through hole 11 in base 1 by the rear extremely front pressure transducer 46 contacting connection successively, piezoelectric ceramics bedplate 45, piezoelectric ceramics spacer 43 and push rod 41, and the piezoelectric ceramics 44 be arranged in described piezoelectric ceramics spacer 43 and the back-moving spring 42 be enclosed within successively on described push rod 41 and back-moving spring pad 49, wherein, each charger 4 is provided with 6 piezoelectric ceramics and is connected in parallel, to ensure to export enough large loading force, the bottom of described push rod 41 connects for contacting with described piezoelectric ceramics 44, on described base 1, the rear port of through hole 11 is provided with rear end cap 47 by bolt, described rear end cap 47 has the cable-through hole 50 for running through power lead and data conductor, on described base 1, the front port of through hole 11 is provided with front end end cover 48 by bolt, the center that described front end end cover 48 is run through on the top of described push rod 41 extend out to the outside of described base 1, described pressure transducer 46 is electrically connected NI data collecting card 6.Due to push rod 41 and piezoelectric ceramics 44, piezoelectric ceramics 44 and piezoelectric ceramics bedplate 45, all adopt between piezoelectric ceramics bedplate 45 and pressure transducer 46 and be located by connecting, bolt is not adopted to fix, so use back-moving spring 42 can ensure that they remain contact.
Described push rod 41 is T-type structure, this one side of the piezoelectric ceramics 44 described in the correspondence of horizontal ends face of T-type structure is formed with the location counterbore for connect with positioning and voltage ceramic 44 front ends equal with described piezoelectric ceramics 44 quantity, the center that the vertical component of T-type structure runs through described front end end cover 48 extend out to the outside of described base 1, and described back-moving spring 42 and back-moving spring pad 49 are enclosed within the vertical component of T-type structure.
On the push rod 41 of the charger 4 in X-direction and Y-direction for the front end clamping check rod 2 be formed be inwardly recessed can with the groove 41a of check rod 2 tight connecting, the push rod 41 of the charger 4 of Z-direction is formed with the outwardly plush copper 41b for withstanding check rod 2 for the front end clamping check rod 2.Described groove 41a and plush copper 41b can keep the directivity loaded in loading procedure, also steadily can load it when not locking main shaft, and be applicable to all kinds of Static stiffness that is vertical, horizontal digital-control For Spindle Unit of Machine Tool and test, versatility is good.
Circumferentially equally spacedly on the side that described piezoelectric ceramics bedplate 45 is positioned at described piezoelectric ceramics 44 be formed with the locating slot that can insert described piezoelectric ceramics 44 bottom equal with described piezoelectric ceramics 44 quantity, the side that described piezoelectric ceramics bedplate 45 is positioned at described pressure transducer 46 has can the pilot hole of gauge head of embedment pressure sensor 46.
Described capacitance displacement sensor 7 is provided with three on check rod 2, is to be separately positioned in the X-direction of check rod 2, Y-direction and Z-direction.
Adopt the charger based on piezoelectric ceramics to load, load continuous and stable, loading force is large, fast response time, compared with traditional hydraulic loading device, there is no the leakage of oil, sealing need not be considered, and three directions can be realized load simultaneously, install easy to carry, improve loading efficiency.
As shown in Figure 6, also be provided with computing machine 8, described computing machine 8 is connected with described NI data collecting card 6, the data of exerting pressure to check rod 2 that the displacement data being obtained the check rod 2 that capacitance displacement sensor 7 collects by NI data collecting card 6 is collected with acquisition pressure transducer 46, described computing machine 8 is also connected with the display 9 of the Static stiffness curve of the power-displacement of the carrying for showing check rod 2.
As shown in Figure 7, the method for testing of a kind of main shaft of numerical control machine tool unit Static stiffness proving installation of the present invention, comprises the steps:
1) check rod is applied to X-direction, Y-direction and Z-direction loading force loading velocity to main shaft of numerical control machine tool is arranged through on computers respectively:
2) computing machine sends control signal to NI data collecting card;
3) voltage amplifier that NI data collecting card connects external power source by the D/A port controlling of self applies voltage to the piezoelectric ceramics in charger;
4) piezoelectric ceramics applies loading force by the push rod pair check rod be connected with tested main shaft of numerical control machine tool, thus makes main shaft produce deflection;
5) computing machine gathers the pressure signal F on check rod that the pressure transducer in three chargers measures respectively by NI data collecting card, and computing machine is by the NI data collecting card check rod displacement signal △ X that measures of the capacitance displacement sensor of capture setting in the X-direction of check rod, Y-direction and Z-direction respectively, and the pressure signal F collected described in storing and displacement signal △ X, include the pressure F of back-moving spring in the pressure signal F measured
t;
6) computing machine is according to Static stiffness value formula F
t=K
tfirst △ X calculates the pressure F of spring
t, wherein K
tfor the rigidity value of known back-moving spring, then by formula F
s=F-F
tcalculate the pressure of main shaft, and carry out curve fitting, draw out the Static stiffness curve of the power-displacement of main shaft, then according to formula
carry out the Static stiffness value calculating main shaft;
7) the Static stiffness value K on the Static stiffness curve of power-displacement and correspondence direction is shown by display
s;
8) in test process, judge whether test completes at any time, if tested, then reduce loading force gradually, spindle deformation also diminishes gradually, and recovering virgin state, back-moving spring plays the effect of reset, push rod and piezoelectric ceramics, piezoelectric ceramics and piezoelectric ceramics bedplate, piezoelectric ceramics bedplate is remained with pressure transducer and contacts; If continue test, then return step 2) proceed.
The principle of work of main shaft of numerical control machine tool unit Static stiffness proving installation of the present invention and method of testing:
For Z-direction, first in a computer human-computer interaction interface to be arranged the loading velocity that Z-direction loads, click load button, signal from the D/A port transmission of NI data collecting card to voltage amplifier, voltage amplifier is connected with external power source, the feeble signal that the transmission of NI data collecting card comes is amplified by voltage amplifier, and then drive piezoelectric ceramics action, produce loading force, loading force passes to check rod by push rod, check rod clamping is on main shaft, and then main shaft creates deflection, and in the process loaded, pressure transducer and capacitance displacement sensor record the size of loading force and spindle deformation amount in real time, and signal is transferred in computing machine by NI data collecting card has carried out Storage and Processing, and show in a graphical form,
During unloading, reduce loading force gradually, spindle deformation also diminishes gradually, and recovers virgin state, back-moving spring makes push rod and piezoelectric ceramics, piezoelectric ceramics and piezoelectric ceramics bedplate, piezoelectric ceramics bedplate remain with pressure transducer to contact, play the effect of reset after unloading; Wherein measured rigidity comprises the rigidity of main shaft and the rigidity of back-moving spring, and the rigidity of back-moving spring needs to record in advance, and is removed in testing software.
Although be described the preferred embodiments of the present invention by reference to the accompanying drawings above; but the present invention is not limited to above-mentioned embodiment; above-mentioned embodiment is only schematic; be not restrictive; those of ordinary skill in the art is under enlightenment of the present invention; do not departing under the ambit that present inventive concept and claim protect, can also make a lot of form, these all belong within protection scope of the present invention.
Claims (9)
1. a main shaft of numerical control machine tool unit Static stiffness proving installation, include base (1), it is characterized in that, described base (1) is provided with the identical check rod for clamping test main shaft of numerical control machine tool (3) (2) of three groups of structures and stressed charger (4) is executed to described check rod (2), described check rod (2) is provided with capacitance displacement sensor (7), the main body of described three groups of chargers (4) lays respectively in described base (1), front end extend out to described base (1) outside for the push rod (41) clamping check rod (2) is positioned in described three groups of chargers (4), and the push rod (41) of three groups of chargers (4) is respectively in X direction, Y-direction and Z-direction stretch out described base (1), also be provided with electrical connection three groups of chargers (4) for described three groups of chargers (4) are executed alive voltage amplifier (5) and respectively with described voltage amplifier (5), the NI data collecting card (6) that capacitance displacement sensor (7) and three groups of chargers (4) are electrically connected, described voltage amplifier (5) connects external power source.
2. main shaft of numerical control machine tool unit Static stiffness proving installation according to claim 1, it is characterized in that, three push rods (41) of the upper corresponding described protuberate basic unit (1) of described base (1) respectively in X direction, Y-direction and Z-direction have three for installing the through hole (11) of identical charger (4) main part of three groups of structures respectively.
3. main shaft of numerical control machine tool unit Static stiffness proving installation according to claim 1 and 2, it is characterized in that, arbitrary group in three groups of described chargers (4) includes: along the through hole (11) in base (1) by the rear extremely front pressure transducer (46) contacting connection successively, piezoelectric ceramics bedplate (45), piezoelectric ceramics spacer (43) and push rod (41), and the piezoelectric ceramics (44) be arranged in described piezoelectric ceramics spacer (43) and the back-moving spring (42) be enclosed within successively on described push rod (41) and back-moving spring pad (49), wherein, the bottom of described push rod (41) connects for contacting with described piezoelectric ceramics (44), the rear port of the upper through hole (11) of described base (1) is provided with rear end cap (47) by bolt, described rear end cap (47) has the cable-through hole (50) for running through power lead and data conductor, the front port of the upper through hole (11) of described base (1) is provided with front end end cover (48) by bolt, the center that described front end end cover (48) is run through on the top of described push rod (41) extend out to the outside of described base (1), described pressure transducer (46) electrical connection NI data collecting card (6).
4. main shaft of numerical control machine tool unit Static stiffness proving installation according to claim 3, it is characterized in that, described push rod (41) is T-type structure, this one side of the piezoelectric ceramics (44) described in the correspondence of horizontal ends face of T-type structure is formed equal to described piezoelectric ceramics (44) quantity connecting and the location counterbore of positioning and voltage pottery (44) front end, the center that the vertical component of T-type structure runs through described front end end cover (48) extend out to the outside of described base (1), described back-moving spring (42) and back-moving spring pad (49) are enclosed within the vertical component of T-type structure.
5. main shaft of numerical control machine tool unit Static stiffness proving installation according to claim 3, it is characterized in that, on the push rod (41) of the charger (4) in X-direction and Y-direction for the front end clamping check rod (2) be formed be inwardly recessed can with the groove (41a) of check rod (2) tight connecting, the push rod (41) of the charger (4) of Z-direction is formed with the outwardly plush copper (41b) for withstanding check rod (2) for the front end clamping check rod (2).
6. main shaft of numerical control machine tool unit Static stiffness proving installation according to claim 3, it is characterized in that, circumferentially equally spacedly on the side that described piezoelectric ceramics bedplate (45) is positioned at described piezoelectric ceramics (44) be formed with the locating slot that can insert described piezoelectric ceramics (44) bottom equal with described piezoelectric ceramics (44) quantity, the side that described piezoelectric ceramics bedplate (45) is positioned at described pressure transducer (46) has can the pilot hole of gauge head of embedment pressure sensor (46).
7. main shaft of numerical control machine tool unit Static stiffness proving installation according to claim 1, it is characterized in that, described capacitance displacement sensor (7) is provided with three on check rod (2), is to be separately positioned in the X-direction of check rod (2), Y-direction and Z-direction.
8. main shaft of numerical control machine tool unit Static stiffness proving installation according to claim 1, it is characterized in that, also be provided with computing machine (8), described computing machine (8) is connected with described NI data collecting card (6), the data that check rod (2) is exerted pressure that the displacement data being obtained the check rod (2) that capacitance displacement sensor (7) collects by NI data collecting card (6) is collected with acquisition pressure transducer (46), described computing machine (8) is also connected with the display (9) of the Static stiffness curve of the power-displacement of the carrying for showing check rod (2).
9. a method of testing for the main shaft of numerical control machine tool unit Static stiffness proving installation described in any one of claim 1-9, is characterized in that, comprise the steps:
1) check rod is applied to X-direction, Y-direction and Z-direction loading force loading velocity to main shaft of numerical control machine tool is arranged through on computers respectively:
2) computing machine sends control signal to NI data collecting card;
3) voltage amplifier that NI data collecting card connects external power source by the D/A port controlling of self applies voltage to the piezoelectric ceramics in charger;
4) piezoelectric ceramics applies loading force by the push rod pair check rod be connected with tested main shaft of numerical control machine tool, thus makes main shaft produce deflection;
5) computing machine gathers the pressure signal F on check rod that the pressure transducer in three chargers measures respectively by NI data collecting card, and computing machine is by the NI data collecting card check rod displacement signal △ X that measures of the capacitance displacement sensor of capture setting in the X-direction of check rod, Y-direction and Z-direction respectively, and the pressure signal F collected described in storing and displacement signal △ X, include the pressure F of back-moving spring in the pressure signal F measured
t;
6) computing machine is according to Static stiffness value formula F
t=K
tfirst △ X calculates the pressure F of spring
t, wherein K
tfor the rigidity value of known back-moving spring, then by formula F
s=F-F
tcalculate the pressure of main shaft, and carry out curve fitting, draw out the Static stiffness curve of the power-displacement of main shaft, then according to formula
carry out the Static stiffness value calculating main shaft;
7) the Static stiffness value K on the Static stiffness curve of power-displacement and correspondence direction is shown by display
s;
8) in test process, judge whether test completes at any time, if tested, then reduce loading force gradually, spindle deformation also diminishes gradually, and recovering virgin state, back-moving spring plays the effect of reset, push rod and piezoelectric ceramics, piezoelectric ceramics and piezoelectric ceramics bedplate, piezoelectric ceramics bedplate is remained with pressure transducer and contacts; If continue test, then return step 2) proceed.
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| WO2021190144A1 (en) * | 2020-03-25 | 2021-09-30 | 东南大学 | High-precision miniaturized on-orbit calibration device and method for six-dimensional force sensor of mechanical arm of space station |
| CN114115121A (en) * | 2021-11-10 | 2022-03-01 | 珠海格力电器股份有限公司 | Detection device, machine tool, and machine tool detection method |
| CN114932454A (en) * | 2022-05-17 | 2022-08-23 | 纽威数控装备(苏州)股份有限公司 | Machining center static stiffness detection method and force application device |
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