CN102313643A - Test equipment for dynamic characteristic of faying surface of linear guide rail of machining center and analysis method thereof - Google Patents
Test equipment for dynamic characteristic of faying surface of linear guide rail of machining center and analysis method thereof Download PDFInfo
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- CN102313643A CN102313643A CN201110258129A CN201110258129A CN102313643A CN 102313643 A CN102313643 A CN 102313643A CN 201110258129 A CN201110258129 A CN 201110258129A CN 201110258129 A CN201110258129 A CN 201110258129A CN 102313643 A CN102313643 A CN 102313643A
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Abstract
The invention relates to test equipment for a dynamic characteristic of a faying surface of a linear guide rail of a machining center and an analysis method thereof. The test equipment comprises: a platform, a nut of a screw rod, a slide block, a motor, a sensor, a guide rail base and a to-be-measured guide rail and the like. A state of an oil film between the slide block and the to-be-measured guide rail are analyzed by a test on the condition of the slide block with different loads and at different moving speeds; dynamic characteristics of a faying surface of a guide rail of a machining center is calculated by utilizing a known calculation means and analysis software, wherein the dynamic characteristics comprise a proportional damping and a rigidity coefficient; and then the dynamic characteristics are introduced into a whole machine limit element model for calculation; at last, an accurate whole machine dynamic characteristic and an accurate bearing analysis result are obtained.
Description
Technical field:
The invention belongs to mechanical field, particularly a kind of machining center line slideway faying face dynamic characteristic test equipment and analytical approach.
Background technology:
Usually we need do dynamic theoretical analysis to machining center complete machine newly developed, mainly analyze its stressed and mode.Analytical approach is mainly analyzed the complete machine three-dimensional model with finite element analysis softwares such as ANSYS.The complete machine three-dimensional model is to be formed by numerous component-assembled, and each parts all have faying face when in software, assembling; If faying face characteristic (elastic modulus, Poisson ratio etc.) setting is identical with parts, then be equivalent to two parts connect firmly together; Yet in work in-process heart when work, will produce the hydrodynamic lubrication oil film between ball in the slide block and guide rail, and the characteristic of oil film (elastic modulus, Poisson ratio etc.) is obvious different with parts, and the existence of oil film makes and has damping between faying face.Oil film has produced significant impact to the dynamic perfromance (stiffness coefficient, mode etc.) of complete machine, therefore when carrying out performance analysis, must be provided with the faying face characteristic.
The dynamic perfromance of faying face and faying face two face surface roughness, movement velocity, load all have bigger relation, therefore, in actual analysis, must experimentize to it and can confirm the faying face correlation parameter.
Summary of the invention:
The present invention utilizes the relation that exists between dynamic perfromance and faying face two face surface roughness, movement velocity, the load of oil film, invents a kind of machining center line slideway faying face dynamic characteristic test equipment and analytical approach.
Technical scheme of the present invention is achieved in that a kind of machining center line slideway faying face dynamic characteristic test equipment, and it is characterized in that: testing apparatus comprises platform, screw mandrel screw, slide block, motor, sensor, track base and guide rail to be measured; Track base is fixed on the platform, is provided with the guide-track groove of two parallel and height such as grade above it, and two guide rails to be measured are separately fixed on the guide-track groove, and a force transducer is respectively established at the two ends of said two guide rails to be measured respectively; Screw mandrel is on the central plane of two guide-track grooves, and its two ends are positioned on the platform through supporting axle bed, and wherein an end and motor output shaft are coupling; Guide rail to be measured is equipped with a slide block respectively; Two slide blocks are fixed into one through a plate; This web joint middle position convexes with an axle up; Ability superimposed load piece is equiped with acceleration transducer on three faces of said slide block, and also is respectively equipped with acceleration transducer at the two ends of ram travel on this axle; Be screwed between screw and the web joint on the screw mandrel and be provided with a connecting piece.
Said platform surface is processed with the parallel inverted T-slot of complex trace; Track base locks on the inverted T-slot of said platform surface through bolt.
Said track base cross section concavity structure, guide-track groove is located at the convex ridge portion of both sides, is provided with corresponding bolt hole between guide rail to be measured and guide-track groove, through bolt with guide rail locking to be measured in guide-track groove; One side of guide-track groove also is provided with the horizontal adjustment piece, and this horizontal adjustment piece passes through locked with bolts in the guide-track groove bottom; Screw mandrel is in the track base recess.
Machining center line slideway faying face dynamic Analysis method:
One, measures guide rail to be measured and shoe surface roughness with synthesis measuring profilometer, can calculate minimum spacing and 10 height of nao-and micro relief on two surfaces according to measurement result profile measurer testing software;
Two, guide rail to be measured and corresponding slide block are installed on testing apparatus, and between slide block and guide rail to be measured, oil lubrication are arranged;
Three, open motor, make the motion of screw mandrel driving sliding block; Oil film thickness in utilization oil film thickness tester and the films test systematic survey slide block between ball and guide rail to be measured; And the minimum spacing that calculates of contrast oil film thickness and step 1, if oil film thickness is littler then can't form the hydrodynamic lubrication oil film than minimum spacing; Whether have oil film to have the dynamic perfromance to slide block and guide rail faying face, also be that the influence of proportional damping and stiffness coefficient is very big;
Four, PV value test changes the screw mandrel velocity of rotation through motor,, representes the m/s of unit with this translational speed that changes the loaded-up condition slide block with V; Quantity through changing the load piece changes slide block and guide rail bearing capacity to be measured, representes the N of unit with P; The oil film thickness of test under different loads, and the minimum spacing that calculates with step 1 contrast see whether there is the hydrodynamic lubrication oil film; Finally not had the PV limit minimum value of hydrodynamic lubrication oil film, also is the product of bearing capacity P and speed V;
Five, proportional damping test in the test of the 4th step, through the force transducer at guide rail to be measured two ends, is tested guide rail to be measured under different loads, and the actual carrying capacity size calculates load loss, and calculates proportional damping through finite element analysis software;
Six, stiffness coefficient test in the test of the 4th step, utilizes three acceleration transducers and the acceleration transducer at ram travel two ends on the slide block, measures the acceleration of slide block, and goes out the stiffness coefficient of faying face by the model analysis computed in software;
Seven, change PV value in the 4th step, obtain proportional damping and stiffness coefficient under the different conditions, contrast variant result of calculation, draw the faying face characteristic when having the hydrodynamic lubrication oil film, and faying face characteristic when not having the hydrodynamic lubrication oil film; Can also can obtain forming simultaneously the boundary condition of hydrodynamic lubrication oil film, also be the PV value;
Eight, with the condition of work of Measurement results, analyze its PV value under condition of work, whether can form the hydrodynamic lubrication oil film the machining center of analogy analysis; The dynamic perfromance that the different working condition is different with correspondence;
Nine, in the result of calculation substitution complete machine finite element model with step 7, the utilization finite element analysis software can obtain complete machine dynamic perfromance and force analysis result accurately.
Testing apparatus of the present invention; Can be according to the test needs, simulate the variation of slide block translational speed and load capacity on guide rail to be measured, through the variation of oil film between test slider and guide rail to be measured; Analyze the also dynamic perfromance of calculating processing center rail faying face; Comprise proportional damping and stiffness coefficient, and be taken in the complete machine finite element model and calculate, can obtain complete machine dynamic perfromance and force analysis result accurately.
Description of drawings:
Below in conjunction with concrete legend the present invention is further specified:
Fig. 1 testing apparatus partial cutaway schematic
Concern diagrammatic cross-section between Fig. 2 testing apparatus track base and guide rail to be measured
Fig. 3 testing apparatus schematic top plan view
Wherein
1-platform 11-inverted T-slot 2-track base 21-guide-track groove
22-horizontal adjustment piece 3-guide rail 4-to be measured slide block 41-web joint
42-axle 5-screw mandrel 51-screw 52-supports axle bed
53-brace 6-motor 7-load piece 8-acceleration transducer
81-force transducer 9-bolt
Embodiment:
With reference to Fig. 1, Fig. 2 and Fig. 3, machining center line slideway faying face dynamic characteristic test equipment comprises platform 1, track base 2, guide rail to be measured 3, slide block 4, sensor, screw mandrel 5, screw 51 and motor 6; Platform 1 uses steel plate, and its surface working has the parallel inverted T-slot of complex trace 11; Track base 2 on the inverted T-slot 11 of said platform surface, can guarantee that it is stable through bolt 9 lockings.Track base 2 cross section concavity structures, guide-track groove 21 is located at the convex ridge portion of both sides, and the parallel and height such as grade of two guide-track grooves 21 that keep processing; Guide rail 3 to be measured is provided with corresponding bolt hole with 21 of guide-track grooves, through bolt 9 guide rail 3 to be measured is locked in guide-track groove 21; One side of guide-track groove 21 also is provided with horizontal adjustment piece 22, and this horizontal adjustment piece 22 is locked in the bottom of guide-track groove 21 through bolt 9, utilizes horizontal adjustment piece 22 can guide rail 3 to be measured be extruded into a side of guide rail mechanism 21.
Article two, guide rail 3 to be measured is equipped with a slide block 4 respectively; Two slide blocks 4 are fixed into one through a plate 41; These web joint 41 middle positions convex with an axle 42 up, and ability superimposed load piece 7 is equiped with acceleration transducer 8 on three faces of said slide block 4 on this axle 42; And also be respectively equipped with acceleration transducer 8 at the two ends of slide block 4 strokes, can be fixed on arbitrary fixture at slide block 4 stroke two ends; A force transducer 81 is respectively established at the two ends of said two guide rails 3 to be measured respectively.
Said screw mandrel 5 is on the central plane of two guide-track grooves 21, says so exactly to be in the central indentation of track base 2, and its two ends are positioned on the platform 1 through supporting axle bed 52, and wherein an end and motor 6 output shafts are coupling; Be connected with a screw 51 on the screw mandrel 5,41 of this screw 51 and web joints are provided with a connecting piece 53, by this brace 53, make that slide block 4 and screw 51 are synchronous, are driven by screw mandrel 5.
This testing apparatus both can change the weight of load piece as required, also can change the speed that slide block 4 slides through regulating the rotating speed of motor 6.
Concrete analytical approach:
As shown in the figure, the dynamic perfromance between slide block 4 and guide rail 3 faying faces is mainly tested and calculated to machining center line slideway faying face dynamic characteristic test platform, also is proportional damping and stiffness coefficient.In this instance, guide rail 3 employing Taiwan PMI line slideways to be measured, model: MSB-TE-25-E; Initial load 20KN increases progressively load piece 7 with 10KN at every turn; Motor 6 rotating speeds are 3000r/m, can realize stepless change; Slide block 4 maximum linear translational speeds are 20M/m, can realize stepless change.Test and the step of analyzing are following:
The first step: before the installation, measure the surfaceness of slide block 4 and guide rail 3 respectively, can calculate minimum spacing and 10 height of nao-and micro relief on two surfaces according to measurement result profile measurer testing software with breathing out the quantity set 2302A of group type synthesis measuring profilometer;
Second step: guide rail 3 to be measured and corresponding slide block 4 are installed on testing apparatus, and on 3 on slide block 4 and guide rail to be measured, oil lubrication are arranged;
The 3rd step: open motor 6, make 4 motions of screw mandrel 5 driving sliding block; The oil film thickness of 3 on ball and guide rail to be measured in utilization PCS EHD2 oil film thickness tester and EHL Ultra films test system (production firm: Engineering Co., Ltd is surveyed in the safety check of Shanghai nation) the measurement slide block 4; And the minimum spacing that calculates of contrast oil film thickness and step 1, if oil film thickness is littler then can't form the hydrodynamic lubrication oil film than minimum spacing; Whether have oil film to exist the dynamic perfromance of slide block 4 with guide rail 3 faying faces to be measured, also be that the influence of proportional damping and stiffness coefficient is very big;
The 4th step:, note load p, the N of unit through axle 42 imposed load pieces 7; Drive screw mandrel 5 through motor 6, slide block 4 is moved with respect to guide rail 3 to be measured, note speed V, the m/s of unit; Note the numerical value of acceleration transducer 8 and force transducer 81 in the motion process;
Can judge whether to exist lubricating oil film according to oil film thickness of measuring and minimum spacing contrast; The load p of the slide block 4 of experimental record and the product of speed V also are the PV value, can be used as the basis for estimation that whether has lubricating oil film;
According to the accekeration of measuring, go out the stiffness coefficient between slide block 4 and guide rail to be measured 3 faying faces with the Modalview model analysis computed in software of the grand diligent scientific & technical corporation in Shanghai,
Measure load value according to imposed load P and force transducer, calculate load loss, and calculate proportional damping through the ANSYS finite element analysis software of U.S. ANSYS company;
The 5th step: a PV value test of every change of the 4th step, correspondence calculates proportional damping and the stiffness coefficient under friction speed and the load, can be used as the dynamic response factor of faying face under this PV state of value.
The 6th: aforementioned calculation result relatively, draw the faying face characteristic when having the hydrodynamic lubrication oil film, and faying face characteristic when not having the hydrodynamic lubrication oil film; Can also can obtain forming simultaneously the boundary condition of hydrodynamic lubrication oil film, also be the PV value;
The 7th step: with the condition of work of Measurement results, analyze its PV value under condition of work, whether can form the hydrodynamic lubrication oil film to the machining center of analogy analysis; The dynamic perfromance that the different working condition is different with correspondence;
The 8th step: in the result of calculation substitution complete machine finite element model with step 5, utilization ANSYS finite element analysis software can obtain complete machine dynamic perfromance and force analysis result accurately.
Machining center is when carrying out performance analysis; Earlier draw the PV value according to working condition; Judge whether then to have the hydrodynamic lubrication oil film, and the faying face dynamic perfromance (it is different whether having dynamically lubricating oil film dynamic perfromance) that obtains through experiment of substitution respectively, find the solution comparatively accurately obtaining.
Claims (3)
1. machining center line slideway faying face dynamic characteristic test equipment and analytical approach, it is characterized in that: testing apparatus comprises platform, screw mandrel screw, slide block, motor, sensor, track base and guide rail to be measured; Track base is fixed on the platform, is provided with the guide-track groove of two parallel and height such as grade above it, and two guide rails to be measured are separately fixed on the guide-track groove, and a force transducer is respectively established at the two ends of said two guide rails to be measured respectively; Screw mandrel is on the central plane of two guide-track grooves, and its two ends are positioned on the platform through supporting axle bed, and wherein an end and motor output shaft are coupling; Guide rail to be measured is equipped with a slide block respectively; Two slide blocks are fixed into one through a plate; This web joint middle position convexes with an axle up; Ability superimposed load piece is equiped with acceleration transducer on three faces of said slide block, and also is respectively equipped with acceleration transducer at the two ends of ram travel on this axle; Be screwed between screw and the web joint on the screw mandrel and be provided with a connecting piece.
Analytical approach:
One, synthesis measuring profilometer is measured guide rail to be measured and shoe surface roughness, calculates minimum spacing and 10 height of nao-and micro relief on two surfaces according to measurement result profile measurer testing software;
Two, guide rail to be measured and corresponding slide block are installed on testing apparatus, and apply oil is lubricated between slide block and guide rail to be measured;
Three, open motor, make the motion of screw mandrel driving sliding block; Oil film thickness in utilization oil film thickness tester and the films test systematic survey slide block between ball and guide rail to be measured; And the minimum spacing that calculates of contrast oil film thickness and step 1, if oil film thickness is littler then can't form the hydrodynamic lubrication oil film than minimum spacing;
Four, PV value test changes the screw mandrel velocity of rotation through motor,, representes the m/s of unit with this translational speed that changes the loaded-up condition slide block with V; Quantity through changing the load piece changes slide block and guide rail bearing capacity to be measured, representes the N of unit with P; The oil film thickness of test under different loads, and the minimum spacing that calculates with step 1 contrast see whether there is the hydrodynamic lubrication oil film; Finally not had the PV limit minimum value of hydrodynamic lubrication oil film, also is the product of bearing capacity P and speed V;
Five, proportional damping test in the test of the 4th step, through the force transducer at guide rail to be measured two ends, is tested guide rail to be measured under different loads, and the actual carrying capacity size calculates load loss, and calculates proportional damping through finite element analysis software;
Six, stiffness coefficient test in the test of the 4th step, utilizes three acceleration transducers and the acceleration transducer at ram travel two ends on the slide block, measures the acceleration of slide block, and goes out the stiffness coefficient of faying face by the model analysis computed in software;
Seven, change PV value in the 4th step, obtain proportional damping and stiffness coefficient under the different conditions, contrast variant result of calculation, draw the faying face characteristic when having the hydrodynamic lubrication oil film, and faying face characteristic when not having the hydrodynamic lubrication oil film; Can also can obtain forming simultaneously the boundary condition of hydrodynamic lubrication oil film, also be the PV value;
Eight, with the condition of work of Measurement results, analyze its PV value under condition of work, whether can form the hydrodynamic lubrication oil film the machining center of analogy analysis; The dynamic perfromance that the different working condition is different with correspondence;
Nine, in the result of calculation substitution complete machine finite element model with step 7, the utilization finite element analysis can obtain complete machine dynamic perfromance and force analysis result accurately.
2. machining center line slideway faying face dynamic characteristic test equipment according to claim 1, it is characterized in that: platform surface is processed with the parallel inverted T-slot of complex trace; Track base locks on the inverted T-slot of said platform surface through bolt.
3. machining center line slideway faying face dynamic characteristic test equipment according to claim 1 and 2; It is characterized in that: track base cross section concavity structure; Guide-track groove is located at the convex ridge portion of both sides; Be provided with corresponding bolt hole between guide rail to be measured and guide-track groove, through bolt with guide rail locking to be measured in guide-track groove; One side of guide-track groove also is provided with the horizontal adjustment piece, and this horizontal adjustment piece passes through locked with bolts in the guide-track groove bottom; Screw mandrel is in the track base recess.
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| CN 201110258129 CN102313643B (en) | 2011-09-01 | 2011-09-01 | Test equipment for dynamic characteristic of faying surface of linear guide rail of machining center and analysis method thereof |
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| CN 201110258129 CN102313643B (en) | 2011-09-01 | 2011-09-01 | Test equipment for dynamic characteristic of faying surface of linear guide rail of machining center and analysis method thereof |
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Cited By (5)
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| CN103017992A (en) * | 2012-12-15 | 2013-04-03 | 南京理工大学 | Device and method for measuring static rigidity of rolling linear guide rail pair |
| CN103674542A (en) * | 2012-09-21 | 2014-03-26 | 全球传动科技股份有限公司 | Test device for linear motion module |
| CN105016027A (en) * | 2015-06-23 | 2015-11-04 | 贵州银泰铝业有限公司 | Aluminum plate carrying device |
| CN105277347A (en) * | 2015-07-31 | 2016-01-27 | 北京工业大学 | Method for using variable-stiffness variable-damping model to identify dynamic characteristic parameters of rolling linear guide rail |
| CN108827609A (en) * | 2018-04-27 | 2018-11-16 | 林明 | A kind of numerical control Self-debugging flange machine |
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| CN105277347A (en) * | 2015-07-31 | 2016-01-27 | 北京工业大学 | Method for using variable-stiffness variable-damping model to identify dynamic characteristic parameters of rolling linear guide rail |
| CN108827609A (en) * | 2018-04-27 | 2018-11-16 | 林明 | A kind of numerical control Self-debugging flange machine |
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