CN103017992B - Device and method for measuring static rigidity of rolling linear guide rail pair - Google Patents
Device and method for measuring static rigidity of rolling linear guide rail pair Download PDFInfo
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- CN103017992B CN103017992B CN201210543660.5A CN201210543660A CN103017992B CN 103017992 B CN103017992 B CN 103017992B CN 201210543660 A CN201210543660 A CN 201210543660A CN 103017992 B CN103017992 B CN 103017992B
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Abstract
The invention discloses a device and a method for measuring static rigidity of a rolling linear guide rail pair. A servo motor is used for driving a ladder-shaped lead screw to drive a loading nut to load the rolling linear guide rail pair. Three loading methods of vertical loading, deflecting loading and pitching loading can be adopted on the guide rail pair by changing installation positions of the guide rail pair and the type of an upper clamp of the guide rail. Measurement points, which correspond to different loading methods respectively, are distributed on the upper clamp and a lower clamp of the guide rail, and are used for determining deformation displacement of the guide rail pair when the guide rail pair is loaded. According to the device and the method for measuring the static rigidity of the rolling linear guide rail pair, automatic measurements of vertical static rigidity, deflecting static rigidity and pitching static rigidity of the rolling linear guide rail pair are achieved, a loaded load is high, measurement accuracy is high, and needs for different loading methods of different guide rail series can be satisfied.
Description
Technical field
The invention belongs to field of measuring technique, particularly a kind of linear rolling guide Static stiffness measurement mechanism and method.
Background technology
Linear rolling guide is generally made up of guide rail, slide block, reverser, rolling body and retainer etc., it is a kind of rolling bearing making relative linear reciprocating motion, can replace direct sliding contact with the steel ball rolling between slide block and guide rail, and rolling body can realize infinite loop by reverser in raceway and slide block.Linear rolling guide has the advantages such as coefficient of friction is little, running precision is high, nothing is creeped, wear-resistant, rigidity is high, thermal deformation is little, is widely used as the guiding parts of high-precision numerical control machine and machining center.
Static stiffness is the important indicator affecting Rolling Components performance and load-bearing capacity, is the basic request for utilization of linear rolling guide.Linear rolling guide Static stiffness refers to the ability of linear rolling guide carrying permanent load, when linear rolling guide is subject to external applied load, will have deformation displacement that is vertical, horizontal direction, and the angular displacement in several direction.This elastic deformation has a significant impact mechanical property, static deformation not only can change the set precision of parts and affect crudy, also can affect the vibration resistance of linear rolling guide, throughput rate, noise, mission life, moving equilibrium, heating and wearing and tearing etc.At present, China has achieved certain achievement in the Static stiffness theoretical research of linear rolling guide, but the development of domestic guide rail Static stiffness measurement mechanism is still in the starting stage, the Static stiffness experiment test of each manufacturer to Related product reality also far can not meet the demands, the optimization limiting properties of product to a certain extent improves, and also brings very large difficulty to the actual type selecting of user.Therefore, developing that a kind of precision is high, load is large, the wide linear rolling guide static stiffness test device of versatility, using it to carry out analysis of experiments to Static stiffness in the linear rolling guide design phase, to ensureing that the rigidity of linear rolling guide has important practical significance.
Through finding the literature search of prior art, the people such as the Fang Jian of the Central China University of Science and Technology adopt hydraulic system to load in the linear rolling guide Static stiffness testing machine of design in 2006, the data genaration Static stiffness curve gathered by force snesor and inductance amesdial, install the guide rail of different model by T-slot, loading hydraulic cylinder can left and right adjusting loading position by ball-screw; This testing machine maximum load load is 30KN, loaded load scope is little, the needs that large gauge guideway Static stiffness is measured can not be met, hydraulic loading system requires higher to Isobarically Control, need during loading by leading screw adjustment Position of Hydraulic Cylinder to load guideway, operation inconvenience, and only carry out the device and method of vertical loading.In addition, Chinese invention patent publication No. CN102279100A, name is called linear rolling guide rigidity tester, the patent describes a kind ofly drive leading screw to be loaded linear rolling guide by crossbeam with servomotor and detect experimental provision and the method for Static stiffness; Drive mechanism is placed in base by this test unit, during heavy duty, testing table susceptor surface can produce less distortion in the vertical direction, certain influence is produced to measuring accuracy, comparatively complicated to the control of servomotor when keeping constant voltage to load, in addition this test unit can only carry out vertical Tensile or Compressive Loading, do not carry out unbalance loading and pitching loading to guide rail, the installing/dismounting inconvenience of displacement transducer, the design of rail clamp can not meet the needs etc. of multiple guide rails assembling test.Therefore, in the measurement of linear rolling guide Static stiffness, also lack the self-operated measuring unit that can carry out large load loading and adapt to multiple guide rail, multiple load manner.
Summary of the invention
The object of the present invention is to provide a kind of high precision, top load, high universalizable, the measurement mechanism of linear rolling guide Static stiffness can measured multiple load mode and measuring method thereof.
The technical solution realizing the object of the invention is: a kind of linear rolling guide Static stiffness measurement mechanism, comprise charging assembly, supporting component, clamping assembly, measurement components and data processing module, described charging assembly comprises servomotor, reductor, loading trapezoidal screw, loading nut and an anti-rotation crossbeam, supporting component comprises base, a column, entablature, Magnetic gauge stand, deck plate, clamping assembly comprises fixture, guide rail lower clamp on force snesor force application rod, upper fixture web member, guide rail, measurement components comprises force snesor and laser displacement sensor, data processing module and the computer processing system needed for data processing, servomotor is connected with reductor, reductor is arranged on entablature, trapezoidal screw is connected with reductor by the bearing in entablature, loading nut is arranged on trapezoidal screw, and move up and down with the rotation of trapezoidal screw, load on nut and be installed with anti-rotation crossbeam, the two ends of anti-rotation crossbeam have through hole, can be enclosed within the symmetrical column installed of the right and left and also can move up and down, the upper end of one column is then provided with entablature, column lower end is then fixedly mounted on base, and base is provided with deck plate, loading nut is installed with the force snesor for measuring magnitude of load, force snesor is threaded connection force sensor force application rod, on guide rail, fixture is connected with force snesor force application rod by upper fixture web member, guide rail lower clamp is arranged on deck plate, Magnetic gauge stand is placed in the surface of deck plate, laser displacement sensor is arranged on the support of corresponding Magnetic gauge stand, the light projector center vertical alignment of laser displacement sensor is vertical, the measuring point of correspondence when deflection or pitching load manner, laser displacement sensor, force snesor is connected with computer processing system respectively with servomotor, servomotor, reductor, one load trapezoidal screw, load nut, force snesor, force snesor force application rod, upper fixture web member coaxial cable, the plane of anti-rotation crossbeam, entablature, deck plate, base is parallel.
The present invention compared with prior art, its remarkable advantage: the deck plate of (1) measurement mechanism is provided with for the secondary lower clamp of mounting guide rail, can realize carrying out vertically different model guideway by switching the upper and lower fixture of different guide rails and changing the position that fixture installs, deflect and the loading of pitching form, there is the feature of highly versatile.(2) load owing to have employed trapezoidal screw, trapezoidal screw has good self-locking property, so measurement mechanism can keep loading force constant preferably, is convenient to the Static stiffness under measurement permanent load.(3) larger owing to loading, when loading to reduce to test, testing table self-deformation is on the impact of test accuracy, the running part of servomotor and reductor composition is placed on measurement mechanism entablature, measurement mechanism base integrally, add the integral rigidity of measurement mechanism, reduce distortion, improve measurement result precision.(4) loaded load of the present invention can reach 600KN, and the high-precision pressure sensor precision of employing can reach 0.3 ‰, and laser displacement sensor accuracy of detection can reach a μm level, and this measuring method can obtain high precision guideway Static stiffness measurement result.(5). by measuring point corresponding during reasonable Arrangement different loads mode, can reduce the layout number of displacement transducer, adopt laser displacement sensor to detect the displacement of measuring point, mounting and adjusting is easy, improves measurement efficiency.
Below in conjunction with accompanying drawing, the present invention is described in further detail.
Accompanying drawing explanation
Fig. 1 is the structure composition of linear rolling guide Static stiffness measurement mechanism of the present invention and assembles schematic diagram.
Fig. 2 is vertical loading structural representation.
Fig. 3 is clamping partial 3-D decomposition view.
Fig. 4 is the upper fixture of deflection and deflection loading structure schematic diagram.
Fig. 5 is fixture and pitching loading structure schematic diagram in pitching.
Fig. 6 is vertical or deflection loads measuring point distribution schematic diagram.
Fig. 7 is that pitching loads measuring point distribution schematic diagram.
Embodiment
The present invention adopts driven by servomotor trapezoidal screw to drive to load nut and loads linear rolling guide, can be carried out vertically, to deflect and pitching loads three kinds of load modes by the type changing fixture on guideway installation site and guide rail to guideway.Force snesor and laser displacement sensor are sampled to the load of tested guide rail pair and distortion respectively, wherein force snesor is fixed on and loads on nut, can with its oscilaltion, the measurement point vertical alignment that the light projector center of laser displacement sensor is corresponding to during Different Loading Method.Can draw linear rolling guide Static stiffness curve by carrying out process to the load gathered and displacement data, thus the test realizing linear rolling guide Static stiffness is measured, and the load range measured is large, highly versatile, precision are high.Particular content is as follows:
Composition graphs 1 ~ Fig. 5, linear rolling guide Static stiffness measurement mechanism of the present invention, comprise charging assembly, supporting component, clamping assembly, measurement components and data processing module, described charging assembly comprises servomotor 5, reductor 6, loads trapezoidal screw 7, load nut 8 and anti-rotation crossbeam 3, Reference numeral 1401,1402,1403,1404 indication that supporting component comprises in base 1, column 2, entablature 4, Magnetic gauge stand 14(and Fig. 2 is all Magnetic gauge stand) (vertical, pitching Static stiffness needs four Magnetic gauge stands 1401,1402,1403,1404 when detecting, and needs two Magnetic gauge stands when deflection Static stiffness detects), deck plate 16, clamping assembly comprises fixture 12, guide rail lower clamp 15 on force snesor force application rod 10, upper fixture web member 11, guide rail, measurement components comprises force snesor 9 and is all laser displacement sensor with Reference numeral 1301,1302,1303 and 1304 indication in laser displacement sensor 13(and Fig. 2, number is corresponding with Magnetic gauge stand), data processing module and the computer processing system needed for data processing, servomotor 5 is connected with reductor 6, reductor 6 is arranged on entablature 4, trapezoidal screw 7 is connected with reductor 6 by the bearing in entablature 4, loading nut 8 is arranged on trapezoidal screw 7, and move up and down with the rotation of trapezoidal screw 7, load on nut 8 and be installed with anti-rotation crossbeam 3, the two ends of anti-rotation crossbeam 3 have through hole, can be enclosed within the symmetrical column 2 installed of the right and left and also can move up and down, the upper end of one column 2 is then provided with entablature 4, column 2 lower end is then fixedly mounted on base 1, base 1 is provided with deck plate 16, loading nut 8 is installed with the force snesor 9 for measuring magnitude of load, force snesor 9 is threaded connection force sensor force application rod 10, on guide rail, fixture 12 is connected with force snesor force application rod 10 by upper fixture web member 11, guide rail lower clamp 15 is arranged on deck plate 16, Magnetic gauge stand 14 is placed in the surface of deck plate 16, laser displacement sensor 13 is arranged on the support of corresponding Magnetic gauge stand 14, the light projector center vertical alignment of laser displacement sensor 13 is vertical, the measuring point of correspondence when deflection or pitching load manner, laser displacement sensor 13, force snesor 9 is connected with computer processing system respectively with servomotor 5, servomotor 5, reductor 6, load trapezoidal screw 7, load nut 8, force snesor 9, force snesor force application rod 10, upper fixture web member 11 coaxial cable, the plane of anti-rotation crossbeam 3, entablature 4, deck plate 16, base 1 is parallel.
Composition graphs 1, the base 1 of linear rolling guide Static stiffness measurement mechanism of the present invention is processed by forging type, the perforate of upper surface two ends, for installing a column 2, heat-treated by modes such as annealing, quenchings, its internal welding is connected to reinforcement, for strengthening the integral rigidity of base 1.
Composition graphs 3, upper fixture web member 11 top of linear rolling guide Static stiffness measurement mechanism of the present invention is a disk-like accessory, along the circumferential direction uniform bolt hole on it, for being bolted with force snesor force application rod 10, its position and size corresponding with force snesor force application rod 10 upper bolt hole, its underpart is a stud, for being connected by screw thread with fixture 12 on the guide rail of bottom.
Composition graphs 3 ~ Fig. 5, on described guide rail, fixture 12 is fixture 1201 in vertical loading, deflection loads upper fixture 1202 or pitching loads upper fixture 1203, and fixture 1201 in vertical loading, deflection load lower surface that upper fixture 1202 or pitching load upper fixture 1203 and be distributed with the measurement point measuring deformation displacement amount when vertical, deflection and pitching load, fixture 12 arranges screw hole and counter sink to guide rail, position and the diameter of screw hole and counter sink is determined according to the threaded hole on guideway 17 slide block, in vertical loading, the symmetrical center positions place of fixture 1201 upper surface also has threaded hole simultaneously, or deflection loads upper fixture 1202 and also has threaded hole in the left or right side of screw hole, or pitching loads upper fixture 1203 side before or after screw hole and also has threaded hole, these threaded holes are used for being connected with the screw rod of force snesor force application rod 10 bottom, as need be applied deflecting torque or the pitching moment of more than 1.5KNm to guideway, screw thread needs the power vertically applying more than 10KN, then the offset distance of the symcenter of threaded hole centre distance guide rail slide block upper bolt aperture should be advisable with 150mm, threaded hole work claims diameter should to be at least 30mm.
Composition graphs 3, the shape of described guide rail lower clamp 15 is one I-shaped, its top arranges threaded hole, bottom arranges screw hole, screw hole distribution situation according to guideway 17 guide rail determines threaded hole, threaded hole distribution situation according to deck plate 16 determines screw hole location, the lower surface of its both sides, top outshot is distributed with the measurement point of displacement when measuring vertical loading.
Composition graphs 2 ~ Fig. 7, the present invention uses above-mentioned linear rolling guide Static stiffness measurement mechanism, and measure linear rolling guide Static stiffness by the displacement switching fixture and detection ad-hoc location measurement point on different guide rails, step is as follows:
(1) one section of guideway 17 is intercepted before measuring as measuring object: shorter than the length of guide rail lower clamp 15 by the rail length intercepting linear rolling guide 17.
(2) preliminary work before measuring: measure as required vertical, deflection or pitching load mode guide rail lower clamp 15 and guideway 17 are installed to the correspondence position of deck plate 16, fixture 12, upper fixture web member 11 on mounting guide rail successively, adjustment loads the position of nut 8, upper fixture web member 11 is connected on force snesor force application rod 10, the light projector center corresponding measurement point of vertical alignment different loads mode respectively of laser displacement sensor 13, open computer processing system, and whether the system works detecting connection complete is normal.
The correspondence position that guide rail lower clamp 15 and guideway 17 are installed to deck plate 16 is by the described load mode measured as required: during vertical loading, guide rail lower clamp 15 is installed to the symmetrical plane position of the deck plate 16 of testing table, guideway 17 is installed on guide rail lower clamp 15, the position of secondary 17 slide blocks of moving guide rail, is located at immediately below force snesor force application rod 10; When deflection loads, guide rail lower clamp 15 is installed to apart from force snesor force application rod 10 eccentric axis position, guideway 17 is installed on guide rail lower clamp 15, the position of secondary 17 slide blocks of moving guide rail, is located at the centre position (ensureing that loaded load active line is positioned at outside the slider area of guideway 17) of guide rail; When pitching loads, guide rail lower clamp 15 is installed to the symmetrical plane position of deck plate 16, guideway 17 is installed on guide rail lower clamp 15, the position of secondary 17 slide blocks of moving guide rail, is located at the pitching loading position place (ensureing that loaded load active line is positioned at outside the slider area of guideway 17) of guide rail one end of guideway 17.
Fixture 12, upper fixture web member 11 on described mounting guide rail successively, adjustment loads the position of nut 8, upper fixture web member 11 is connected on force snesor force application rod 10 and is: by fixture 12 on screw mounting guide rail on the slide block of guideway 17, on guide rail fixture 12 threaded hole in screw in the screw rod of fixture web member 11, and making the axial alignment of fixture web member 11 and force snesor force application rod 10 bolt hole, screw-in length is screw flight length
, the position driving servomotor 5 adjustment to load nut 8 makes force snesor force application rod 10 lower surface and upper fixture web member 11 be close to and produce pretightning force effect, is bolted fixture web member 11 and force snesor force application rod 10.
Described by the light projector center of laser displacement sensor 13 respectively the corresponding measurement point of vertical alignment different loads mode be: during vertical loading, measurement point is: face, the slide block left and right symmetrical plane A about guideway 17 is symmetrical, in vertical loading, the measuring point 1 of fixture 1201 lower surface and measuring point 2 are 5 ~ 10mm apart from the face, slide block left and right of guideway 17 respectively, the measuring point 3 of guide rail lower clamp 15 lower surface and measuring point 4 are 5 ~ 10mm apart from this guide rail lower clamp 15 left and right side C, D, and these 4 measuring points are all positioned on slide block front-back symmetrical plane B; When deflection loads, measurement point is: face, the slide block left and right symmetrical plane A about guideway 17 is symmetrical, it is 5 ~ 10mm apart from two surfaces about slide block respectively that deflection loads the measuring point 1 of upper fixture 1202 lower surface and measuring point 2, and this measuring point 1 and measuring point 2 are positioned on slide block front-back symmetrical plane B; When pitching loads, measurement point is: the slide block front-back symmetrical plane B about guideway 17 is symmetrical, about measuring point 5,6,7, the 8 distance slide block of upper fixture 1203 lower surface of pitching loading, two surfaces are 5 ~ 10mm, and measuring point 5,6 and measuring point 7,8 lay respectively at the guide rail both sides of guideway 17.
(3) first carry out prestrain to tested guide rail pair 17, the load value of prestrain is 1 ~ 5% of guideway 17 dynamic load rating, is mainly used in the gap of eliminating each parts.
(4) on the basis of prestrain, force snesor 9 and the indicating value of laser displacement sensor 13 are placed in initial value, carry out measurement again to load, and in the dynamic load rating range ability of 5%-50%, load successively by the interval being not more than 5% and keep constant voltage 30-60s, displacement data corresponding when simultaneously gathering load and the different loads mode of each constant-voltage phase.Displacement data corresponding during described different loads mode is: during vertical loading, and guideway 17 deformation displacement is in the vertical direction
, wherein
,
for the lower surface of fixture in vertical loading 1201 is relative to the displacement of deck plate 16 upper surface,
,
for the lower surface of guide rail lower clamp 15 is relative to the displacement of deck plate 16 upper surface; When deflection loads, guideway in the deformation angle displacement of yawing moment is
, wherein,
,
for deflection loads the displacement of upper fixture 1202 relative to deck plate 16 upper surface, the distance between measuring point 1,2 is
; When pitching loads, guideway in the deformation angle displacement of pitch orientation is
, wherein,
,
,
,
for the lower surface of fixture in pitching 1203 is relative to the displacement of deck plate 16 upper surface, the distance between measuring point 5,6 or measuring point 7,8 is L, and L is not less than guideway 17 its length
.
(5) data of sampling are processed, matching are carried out to all data points, rejecting abnormalities point, draw linear rolling guide 17 under different loads mode Static stiffness curve (vertical Static stiffness take N as abscissa unit,
for Static stiffness curve is drawn by ordinate unit; Deflection, pitching Static stiffness take Nm as abscissa unit, and mrad is that Static stiffness curve is drawn by ordinate unit), the inverse of rate of curve is guideway 17 Static stiffness value.
(6) after being loaded into 50% of the dynamic load rating of guideway 17, Unloading Condition is carried out, simultaneously the situation of change of the real time measure load and displacement, until unloading is zero, end data collecting work simultaneously.
By above implementation process, the devices and methods therefor in the present invention is adopted to achieve the vertical Static stiffness of linear rolling guide, the automatic measurement deflecting Static stiffness and pitching Static stiffness respectively, loaded load is large, measuring accuracy is high, can meet the needs of different guide rail series to vertical, deflection, pitching Different Loading Method.
Claims (9)
1. a linear rolling guide Static stiffness measurement mechanism, it is characterized in that comprising charging assembly, supporting component, clamping assembly, measurement components and data processing module, described charging assembly comprises servomotor (5), reductor (6), loading trapezoidal screw (7), loading nut (8) and an anti-rotation crossbeam (3), supporting component comprises base (1), a column (2), entablature (4), Magnetic gauge stand (14), deck plate (16), clamping assembly comprises fixture (12), guide rail lower clamp (15) on force snesor force application rod (10), upper fixture web member (11), guide rail, measurement components comprises force snesor (9) and laser displacement sensor (13), data processing module and the computer processing system needed for data processing, servomotor (5) is connected with reductor (6), reductor (6) is arranged on entablature (4), trapezoidal screw (7) is connected with reductor (6) by the bearing in entablature (4), loading nut (8) is arranged on trapezoidal screw (7), and move up and down with the rotation of trapezoidal screw (7), load on nut (8) and be installed with anti-rotation crossbeam (3), the two ends of anti-rotation crossbeam (3) have through hole, one column (2) that can be enclosed within the installation of the right and left symmetry above also can move up and down, the upper end of one column (2) is then provided with entablature (4), column (2) lower end is then fixedly mounted on base (1), base (1) is provided with deck plate (16), loading nut (8) is installed with the force snesor (9) for measuring magnitude of load, force snesor (9) is threaded connection force sensor force application rod (10), on guide rail, fixture (12) is connected with force snesor force application rod (10) by upper fixture web member (11), guide rail lower clamp (15) is arranged on deck plate (16), Magnetic gauge stand (14) is placed in the surface of deck plate (16), laser displacement sensor (13) is arranged on the support of corresponding Magnetic gauge stand (14), the light projector center vertical alignment of laser displacement sensor (13) is vertical, the measuring point of correspondence when deflection or pitching load manner, laser displacement sensor (13), force snesor (9) is connected with computer processing system respectively with servomotor (5), servomotor (5), reductor (6), one load trapezoidal screw (7), load nut (8), force snesor (9), force snesor force application rod (10), upper fixture web member (11) coaxial cable, the plane of anti-rotation crossbeam (3), entablature (4), deck plate (16), base (1) is parallel.
2. linear rolling guide Static stiffness measurement mechanism according to claim 1, it is characterized in that described upper fixture web member (11) top is a disk-like accessory, along the circumferential direction uniform bolt hole on it, for being bolted with force snesor force application rod (10), its position and size corresponding with force snesor force application rod (10) upper bolt hole, its underpart is a stud, for being connected by screw thread with fixture (12) on the guide rail of bottom.
3. linear rolling guide Static stiffness measurement mechanism according to claim 1, it is characterized in that on described guide rail, fixture (12) is fixture in vertical loading (1201), deflection loads upper fixture (1202) or pitching loads upper fixture (1203), fixture (1201) in vertical loading, deflection load lower surface that upper fixture (1202) or pitching load upper fixture (1203) and are distributed with the measurement point measuring deformation displacement amount when vertical, deflection and pitching load; Fixture (12) arranges screw hole and counter sink to guide rail, position and the diameter of screw hole and counter sink is determined according to the threaded hole on guideway (17) slide block, in vertical loading, the symmetrical center positions place of fixture (1201) upper surface also has threaded hole simultaneously, or deflection loads upper fixture (1202) and also has threaded hole in the left or right side of screw hole, or pitching loads upper fixture (1203) side before or after screw hole and also has threaded hole, these threaded holes are used for being connected with the screw rod of force snesor force application rod (10) bottom.
4. linear rolling guide Static stiffness measurement mechanism according to claim 1, it is characterized in that the shape of described guide rail lower clamp (15) is one I-shaped, its top arranges threaded hole, bottom arranges screw hole, screw hole distribution situation according to guideway (17) guide rail determines threaded hole, threaded hole distribution situation according to deck plate (16) determines screw hole location, the lower surface of its both sides, top outshot is distributed with the measurement point of displacement when measuring vertical loading.
5. utilize the linear rolling guide Static stiffness measurement mechanism described in claim 1,2,3 or 4 to carry out a method for Static stiffness measurement, it is characterized in that step is as follows:
(1) one section of guideway (17) is intercepted before measuring as measuring object: shorter than the length of guide rail lower clamp (15) by the rail length intercepting linear rolling guide (17);
(2) preliminary work before measuring: that measures as required is vertical, guide rail lower clamp (15) and guideway (17) are installed to the correspondence position of deck plate (16) by deflection or pitching load mode, fixture (12) on mounting guide rail successively, upper fixture web member (11), adjustment loads the position of nut (8), upper fixture web member (11) is connected on force snesor force application rod (10), the light projector center corresponding measurement point of vertical alignment different loads mode respectively of laser displacement sensor (13), open computer processing system, and whether the system works detecting connection complete is normal,
(3) first carry out prestrain to tested guide rail pair (17), the load value of prestrain is 1 ~ 5% of guideway (17) dynamic load rating;
(4) on the basis of prestrain, force snesor (9) and the indicating value of laser displacement sensor (13) are placed in initial value, carry out measurement again to load, and in the dynamic load rating range ability of 5%-50%, load successively by the interval being not more than 5% and keep constant voltage 30-60s, displacement data corresponding when simultaneously gathering load and the different loads mode of each constant-voltage phase;
(5) data of sampling are processed, matching is carried out to all data points, rejecting abnormalities point, the Static stiffness curve of linear rolling guide (17) under drafting different loads mode, the inverse of rate of curve is guideway (17) Static stiffness value;
(6) after being loaded into 50% of the dynamic load rating of guideway (17), Unloading Condition is carried out, simultaneously the situation of change of the real time measure load and displacement, until unloading is zero, end data collecting work simultaneously.
6. linear rolling guide Static stiffness measuring method according to claim 5, it is characterized in that in step (2), the correspondence position that guide rail lower clamp (15) and guideway (17) are installed to deck plate (16) is by the load mode measured as required: during vertical loading, guide rail lower clamp (15) is installed to the symmetrical plane position of the deck plate (16) of testing table, guideway (17) is installed on guide rail lower clamp (15), the position of moving guide rail pair (17) slide block, be located at immediately below force snesor force application rod (10), when deflection loads, guide rail lower clamp (15) is installed to apart from force snesor force application rod (10) eccentric axis position, guideway (17) is installed on guide rail lower clamp (15), the position of moving guide rail pair (17) slide block, is located at the centre position of guide rail, when pitching loads, guide rail lower clamp (15) is installed to the symmetrical plane position of deck plate (16), guideway (17) is installed on guide rail lower clamp (15), the position of moving guide rail pair (17) slide block, is located at the pitching loading position place of guide rail one end of guideway (17).
7. linear rolling guide Static stiffness measuring method according to claim 5, it is characterized in that in step (2), fixture (12) on described mounting guide rail successively, upper fixture web member (11), adjustment loads the position of nut (8), upper fixture web member (11) is connected on force snesor force application rod (10) and is: by fixture (12) on screw mounting guide rail on the slide block of guideway (17), on guide rail fixture (12) threaded hole in screw in the screw rod of upper fixture web member (11), and make the axial alignment of fixture web member (11) and force snesor force application rod (10) bolt hole, screw-in length is screw flight length
the position driving servomotor (5) adjustment to load nut (8) makes force snesor force application rod (10) lower surface and upper fixture web member (11) be close to and produce pretightning force effect, is bolted fixture web member (11) and force snesor force application rod (10).
8. linear rolling guide Static stiffness measuring method according to claim 5, it is characterized in that in step (2), described by the light projector center of laser displacement sensor (13) respectively the corresponding measurement point of vertical alignment different loads mode be: during vertical loading, measurement point is: face, the slide block left and right symmetrical plane A about guideway (17) is symmetrical, in vertical loading, the measuring point 1 of fixture (1201) lower surface and measuring point 2 are 5 ~ 10mm apart from the face, slide block left and right of guideway (17) respectively, the measuring point 3 of guide rail lower clamp (15) lower surface and measuring point 4 are apart from this guide rail lower clamp (15) left and right side C, D is 5 ~ 10mm, these 4 measuring points are all positioned on slide block front-back symmetrical plane B, when deflection loads, measurement point is: face, the slide block left and right symmetrical plane A about guideway (17) is symmetrical, it is 5 ~ 10mm apart from two surfaces about slide block respectively that deflection loads the measuring point 1 of upper fixture (1202) lower surface and measuring point 2, and this measuring point 1 and measuring point 2 are positioned on slide block front-back symmetrical plane B, when pitching loads, measurement point is: the slide block front-back symmetrical plane B about guideway (17) is symmetrical, about measuring point 5,6,7, the 8 distance slide block of upper fixture (1203) lower surface of pitching loading, two surfaces are 5 ~ 10mm, and measuring point 5,6 and measuring point 7,8 lay respectively at the guide rail both sides of guideway (17).
9. linear rolling guide Static stiffness measuring method according to claim 5, it is characterized in that in step (4), displacement data corresponding during described different loads is: during vertical loading, and guideway (17) deformation displacement is in the vertical direction
wherein s
1, s
2for the lower surface of fixture in vertical loading (1201) is relative to the displacement of deck plate (16) upper surface, s
3, s
4for the lower surface of guide rail lower clamp (15) is relative to the displacement of deck plate (16) upper surface; When deflection loads, guideway in the deformation angle displacement of yawing moment is
wherein, s
1, s
2for deflection loads the displacement of upper fixture (1202) relative to deck plate (16) upper surface, the distance between measuring point 1,2 is l; When pitching loads, guideway in the deformation angle displacement of pitch orientation is
wherein, s
5, s
6, s
7, s
8for the lower surface of fixture in pitching (1203) is relative to the displacement of deck plate (16) upper surface, the distance between measuring point 5,6 or measuring point 7,8 is L, and L is not less than guideway (17) its length
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| CN108534970B (en) * | 2018-06-01 | 2024-04-23 | 南京理工大学 | High-precision linear guide rail pair static stiffness comprehensive measurement device and method |
| CN111024341B (en) * | 2019-12-25 | 2024-06-14 | 大连理工大学 | Contact stiffness testing device and testing method |
| CN111044242B (en) * | 2019-12-30 | 2021-09-28 | 哈尔滨工业大学 | Rigidity detection device and detection method for main shaft and guide rail of ultra-precise fly-cutting machine tool |
| CN113390708A (en) * | 2021-06-29 | 2021-09-14 | 东风耐世特转向系统(武汉)有限公司 | Detection tool for detecting rigidity of riveting structure |
| CN115628866B (en) * | 2022-12-21 | 2023-05-16 | 中国空气动力研究与发展中心高速空气动力研究所 | Full-automatic three-dimensional deformation measurement positioning loading system and application method thereof |
| CN117268268B (en) * | 2023-09-27 | 2024-07-26 | 深圳市深科达智能装备股份有限公司 | Reverse monitoring assembly, guide rail pair and monitoring method |
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