CN108007402A - A kind of oil film thickness static demarcating method - Google Patents
A kind of oil film thickness static demarcating method Download PDFInfo
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- CN108007402A CN108007402A CN201711287544.0A CN201711287544A CN108007402A CN 108007402 A CN108007402 A CN 108007402A CN 201711287544 A CN201711287544 A CN 201711287544A CN 108007402 A CN108007402 A CN 108007402A
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- 238000011088 calibration curve Methods 0.000 abstract description 2
- 239000003921 oil Substances 0.000 description 72
- 238000010586 diagram Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 239000010687 lubricating oil Substances 0.000 description 4
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B17/00—Measuring arrangements characterised by the use of infrasonic, sonic or ultrasonic vibrations
- G01B17/02—Measuring arrangements characterised by the use of infrasonic, sonic or ultrasonic vibrations for measuring thickness
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Abstract
The invention belongs to ultrasonic precision field of measuring technique, more particularly to a kind of oil film thickness static demarcating method, this method is realized in oil film thickness static demarcating device, before the actual measurement oil film thickness using its ultrasonic probe, the calibration of progress ultrasonic probe equipment is just needed first, this proving operation is only needed when measuring first, and the present invention is compared with prior art, oil film thickness can be adjusted arbitrarily, and the probe of different frequency responses can be calibrated：During static demarcating, by adjusting the height of right translation platform, arbitrary oil film thickness can be formed；Calibration result precision is high, sets initial oil film thickness h0And determine its numerical value using the method for spectrum analysis, as theoretical thickness curve and the common initial point of actual thickness curve in calibration curve, scaling method is likely to occur before can avoiding the problem that, so as to greatly reduce the influence of systematic error and mismachining tolerance to measurement accuracy, hence it is evident that improve calibration result precision.
Description
Technical field：
The invention belongs to ultrasonic precision field of measuring technique, and in particular to a kind of oil film thickness static demarcating method.
Background technology：
The mechanical organs such as gear, bearing rely on lubricating oil film to contacting the isolation on surface, with very long during normal work
Service life.However, once lubricating oil film fails, two contact surfaces can be in contact and rub, and the thing followed is exactly element
Abrasion and gluing.So suitable oil film thickness will be very big on the performance of friction mechanism and usage time influence.Lubrication
The performance of oil, the shape on two contact surfaces and operating condition can all influence the thickness of lubricating oil film.The way of contact on two surfaces
It is divided into face contact (such as journal bearing and thrust bearing), line contact (such as gear) and point contact (such as rolling bearing).Under the contact of face
The oil film thickness in hydrodynamic lubrication region is generally in the range of 1um~100um, and point contact and the lower elastohydrodynamic lubrication region oil of line contact
Film thickness is less than 1um.Whether which kind of way of contact, lubricating oil film sufficiently thick must isolate two surfaces with this, but oil film
It is too thick but can cause oil drag power increase, cause excessive pumping forces to be lost.Therefore, oil film thickness can influence the matter of hydrodynamic lubrication
Amount is, it is necessary to measure thickness, so as to understand the lubricating status of mechanical equipment in real time.
There are a variety of methods to be used to measurement oil film thickness, such as electric-resistivity method, capacitance method, optical method etc. at present.Electric-resistivity method and
Need to be electrically isolated or surface-mounted electrode during capacitance measurement, and measurement result is very sensitive to surface roughness；
And both approaches can only generally measure the oil film thickness of more than 1um.One in two contact surfaces is needed when optical method measures
Surface is transparent or to set transparency window, and the setting of transparency window causes optical measuring method temporarily to be answered in industrial quarters
With.Above method is respectively provided with invasive, and when measurement needs to carry out bearing infringement in varying degrees, and institute is current in these processes
It can't carry out the actual measurement of industrial bearing oil film thickness.The appearance of Noninvasive ultrasonic Method for Measuring is to solve the problems, such as this
Possibility is provided, its principle is by carrying out spectrum analysis to the reflected signal of solid-liquid interface, by selecting at suitable signal
Reason method (such as resonance model or spring model) obtains oil film thickness.The measurable film thickness range of supercritical ultrasonics technology is very wide, from several
Ten nanometers can be competent to hundreds of millimeters, be completely suitable for the measurement of industrial bearing thickness.However, although supercritical ultrasonics technology has so
The advantages of more, but the calibration to ultrasonic wave thickness measuring apparatus is still within a primary stage at present.Some researcher's profits
Demarcated with the gasket that specific thicknesses are laid between two surfaces, also there is researcher to process specific thickness using the upper surface of test block
What the groove of degree was demarcated, these scaling methods all have as a drawback that：Oil film thickness is a immobilizes in calibration process
Value, and the ultrasonic probe of different frequency response needs different oil film thicknesses to demarcate；Two tables can not be determined in calibration process
Whether gap is still had between face and intermediate washer；Above all measurement result contains systematic error and mismachining tolerance
Deng, particularly when demarcating oil film thickness and needing very little, the machining accuracy in common workshop it is difficult to ensure that spacer thickness or
Test block depth of groove is exactly required numerical value.It can be seen from the above that current ultrasonic measurement thickness calibration facility and method cause to mark
Determine result and measuring result error is very big.
The content of the invention：
It is an object of the invention to overcome the defects of scaling method precision existing in the prior art is low, nominal thickness is single,
Seek design and a kind of oil film thickness static demarcating method be provided, realize that thickness is constant by static demarcating device or the long period not
The calibration of probe measurement precision and scope during change.
To achieve these goals, oil film thickness static demarcating method of the present invention is filled in oil film thickness static demarcating
Middle realization is put, before the actual measurement oil film thickness using its ultrasonic probe, just needs to carry out ultrasonic probe equipment first
Calibration, this proving operation are only needed when measuring first, and the scaling method of the oil film thickness static demarcating method is specifically according to such as
Lower step carries out：
Adjustable support foot is adjusted after S1, assembling, and is measured with ruler and ensures that four support feets are highly consistent；By level
Ruler is placed on the short slab part of left L shaped plate, and whether observation horizon rule bubble is in center, as do not adjusted bowing for left L shaped plate if
Face upward position so that horizon rule bubble is at center；During static demarcating, the pitch position of right L shaped plate is adjusted according to the method described above so that
The horizon rule bubble for being placed on right L shaped plate short slab part is also at center；
S2, the spiral head for first rotating right translation platform, raise right L shaped plate so that top surface and left L shaped plate on right L shaped plate short slab
Short slab bottom surface contacts, although contacting at this time, due to left L shaped plate and right L shaped plate flatness, the depth of parallelism, roughness and L plates
Between deformation the problems such as, at this time oil film thickness not be 0；Rotate the spiral head N of right translation platform0A lattice, reduce right L in theory
The height of shape plate is 10 × N0Micron, i.e. theoretical oil film thickness at this time in the bottom surface of left L shaped plate and right L shaped plate between top surface are
10×N0Micron, using FFT (Fast Fourier Transform (FFT)) to ultrasonic reflections signal (left L shaped plate bottom surface and lubricant interface
The reflected signal at place) spectrum analysis is carried out, obtain reflection coefficient curve；
S3, find the corresponding resonant frequency of minimum point in reflection coefficient curve, and brings following thickness calculation formula into
Solve actual oil film thickness h0：
Wherein h0For actual oil film thickness, c is the velocity of sound in oil film, and m is oil film resonance exponent number, and f is m rank resonant frequencies,
That is the corresponding frequency of reflectance factor minimum point, here with h0Initial or original thickness during as static demarcating；
S4, continue to rotate right translation platform spiral head N1A lattice, reduce by 10 × N of right L shaped plate height1Micron, to ultrasonic wave at this time
Reflected signal (reflected signal at left L shaped plate bottom surface and lubrication oil interface) can be calculated reality after carrying out FFT transform processing
Border oil film thickness h1, by h1With theoretical oil film thickness h0+10×N1Micron is contrasted and demarcated；
S5, repeat S4, reduces right L shaped plate height for continuous more than 3 times, records the oil film thickness and theory oil film actually obtained
Thickness, and contrasted, finally obtain the static demarcating curve of ultrasonic measurement thickness.
The agent structure of static demarcating device of the present invention includes：Upper plate, support leg, crossbeam, oil groove, adjustable supporting
It is spike, connector bar, angle adjustable bolt, left connection board, left platform, left L shaped plate, elasticity adjusting bolt, gripping block, super
Sonic probe, major connector, right L shaped plate, right translation platform, right connection board, first shaft coupling, ultrasonic wave transmitting/receiving instrument, oscillography
Device and PC machine, the four corners of the upper plate of square platy structure are vertically arranged with the support leg to play a supportive role respectively, branch
The bottom of support leg is provided with adjustable support foot, described positioned at a left side to make upper plate holding horizontal by adjusting adjustable support foot
The crossbeam of its fixation is connected between side and the adjustable support foot on right side, is provided with to contain immediately below the upper plate
Drain the oil the oil groove in source, the oil groove is upper end uncovered structure；The connector bar is connected through a screw thread with upper plate, and is run through
Through hole among upper plate simultaneously extends to the upper side of upper plate, and the lower end of the connector bar is provided with first shaft coupling,
The upper end of major connector of the lower end of the first shaft coupling with placing vertically is connected, and the lower end of major connector is provided with elasticity
Gripping block, is clamped with ultrasonic probe in the gripping block, is provided with to adjust the elasticity of clamping elasticity in gripping block
Adjusting bolt, elasticity adjusting bolt pick and place and clamp ultrasonic probe, and the ultrasonic probe launches ultrasonic signal, and
The ultrasonic reflections signal of left L shaped plate transverse slat bottom surface is received, the ultrasonic probe is connected with ultrasonic wave transmitting/receiving instrument, is surpassed
Sound wave transmitting/receiving instrument is connected by oscillograph with PC machine, and the information ultrasonic probe to be collected is sent out by ultrasonic wave
Penetrate/receiving instrument received, and come out in oscilloscope display, then monitored and calculate in real time by PC machine；In the upside of upper plate
Face middle is provided with angle adjustable bolt using connector bar as center of circle array, angle adjustable bolt through upper side and
The upper surface of its tail end and first shaft coupling, to finely tune the pitch angle of first shaft coupling by angle adjustable bolt
Degree；Left connection board and right connection board, the square left side placed vertically are respectively arranged with left and right sides of the first shaft coupling
Lower surface of the upper end of connecting plate and right connection board respectively with upper plate is connected, the inner side point of the left connection board and right connection board
Left platform and right translation platform are not provided with, and left L shaped plate and right L-shaped are respectively arranged with the inside of left platform and right translation platform
Plate, the riser of left platform and right translation platform respectively with left L shaped plate and right L shaped plate are connected, the left L shaped plate and right L-shaped
The lower end of the riser of plate is respectively the transverse slat position of transverse slat that is horizontal positioned and extending inwardly, the left L shaped plate and right L shaped plate
In the downside of ultrasonic probe, the left platform and right translation platform to adjust respectively the transverse slat of left L shaped plate and right L shaped plate it
Between relative position relation, and adjust left L shaped plate and the relative position relation of right L shaped plate and oil sources.
Further, support leg of the present invention uses the aluminum alloy industrial profile frame of 6-10mm groove widths, shape wheel
Exterior feature has circular arc chamfering, and surface is by anodic oxidation silvery white processing.
Further, the setting quantity of angle adjustable bolt of the present invention is preferably 6.
Further, ultrasonic probe of the present invention is water logging type, and center probe frequency response is at least 10MHz.
Further, left platform and right translation platform of the present invention are manual accurate translation stage, and mesa dimensions should
At least 65mm × 65mm, carrying are at least 10Kg, and stroke is at least 25mm, minimum scale 10um, using high-accuracy ball
Screw drive, and there is lateral locking device.
Further, the upper top surface of the bottom surface of left L shaped plate transverse slat of the present invention, right L shaped plate transverse slat is using mill
Finishing is cut, by being ground finishing to improve machining accuracy, its surface roughness is reduced, so as to reduce surface roughness to oil
The influence of film thickness measurement accuracy, to ensure the accuracy of test.
Further, first shaft coupling of the present invention uses the flexible bellow shaft coupling that aluminum alloy materials make.
Further, left L shaped plate of the present invention and right L shaped plate are using aluminium or stainless steel or other chance water non-corrosives
Metal material, other shop parts select same metal material.
Further, the response pulse duration of ultrasonic wave transmitting/receiving instrument of the present invention is more than or equal to 35MHz.
Further, oil groove of the present invention is fabricated using transparent material, is preferably organic glass or sub- gram
Power plate is with order to directly observing the formational situation of oil film thickness.
Compared with prior art, the present invention have the advantages that：
1st, caliberating device of the present invention is simple in structure, cost is low, small, and building structure is readily appreciated that, assembly method letter
Single, used standard component is common part in Machine Design, and non-standard component is mostly L-shaped or cuboid, and processing is held
Easily, of low cost, application requirement is applicable not only to laboratory and is also applied for enterprise than relatively low.
2nd, oil film thickness can be adjusted arbitrarily, and the probe of different frequency responses can be calibrated：It is right by adjusting during static demarcating
The height of translation stage, can form arbitrary oil film thickness.
3rd, calibration result precision is high：Initial oil film thickness h is set0, and determine its numerical value using the method for spectrum analysis, make
For theoretical thickness curve and the common initial point of actual thickness curve in calibration curve, scaling method is likely to occur before can avoiding
The problem of (there are micro gap such as between two test blocks and intermediate washer, or the lower test block depth of groove of two test blocks to have processing to miss
Difference), so as to greatly reduce the influence of systematic error and mismachining tolerance to measurement accuracy, hence it is evident that improve calibration result precision.
4th, available for the research that industrial lubrication is theoretical and tests：It is super that static demarcating equipment in the present invention is applied not only to calibration
The measurement accuracy and measurement range of sonic probe equipment, certain modification can be additionally used in the research that industrial lubrication is theoretical and tests, such as
Elliptic Cylinder is changed to ball, left L shaped plate bottom surface is designed to circle, and static demarcating equipment just becomes classics at this time
Ball-disc system, and transparency window need not be set on disk at this time, it can be measured using supercritical ultrasonics technology actual under industrial environment
Oil film thickness between ball-disk, can be studied using this device and enrich industrial lubrication theory.
5th, the characteristic of ultrasonic wave and the design feature of this caliberating device can be utilized, realizes the high-precision of ultrasonic wave caliberating device
Scale is determined, and solves the problems, such as that conventional scaling method device is simple and crude, stated accuracy is low, calibration probe is single, using friendly with environment
Good, market prospects are wide, have highly application value.
Brief description of the drawings：
Fig. 1 is the top plate and tank structure and the relation principle of position of oil film thickness static demarcating device of the present invention
Schematic diagram.
Fig. 2 is oil film thickness static demarcating apparatus main body principle schematic diagram of the present invention, and wherein Fig. 2 (a) is
Static demarcating schematic diagram, Fig. 2 (b) are static demarcating installation diagram.
The formation figure of difference oil film thickness when Fig. 3 is progress static demarcating of the present invention, wherein Fig. 3 (a) is initial
Oil film thickness h0, Fig. 3 (b) is oil film thickness h1。
Fig. 4 is the static demarcating curve map of ultrasonic probe of the present invention.
Embodiment：
The present invention is further detailed by way of example and in conjunction with the accompanying drawings.
Embodiment 1：
The oil film thickness static demarcating method that the present embodiment is related to is realized in oil film thickness static demarcating device, is being utilized
Before the actual measurement oil film thickness of its ultrasonic probe, just need to carry out the calibration of ultrasonic probe equipment, this proving operation first
Only needed when measuring first, the scaling method of the caliberating device of the ultrasonic measurement thickness specifically carries out in accordance with the following steps：
S1, build top plate 1, support leg 2 and crossbeam 3 successively, then oil groove 4 is placed in four 2 middles of support leg, then presses
According to static demarcating caliberating device is assembled shown in Fig. 2 successively；
S2, adjust adjustable support foot 5, and is measured with ruler and ensure that four support feets are highly consistent；Horizon rule is placed on left L
The short slab part of shape plate 10, whether observation horizon rule bubble is in center, the pitching position as do not adjusted left L shaped plate 10 if
Put so that horizon rule bubble is at center；During static demarcating, the pitch position of right L shaped plate 15 is adjusted according to the method described above so that put
Horizon rule bubble in right 15 short slab part of L shaped plate is also at center；
S3, the spiral head for first rotating right translation platform 16, raise right L shaped plate 15 so that top surface and a left side on right 15 short slab of L shaped plate
10 short slab bottom surface of L shaped plate contact, although at this time contact, due to the flatness of left L shaped plate 10 and right L shaped plate 15, the depth of parallelism,
The problems such as deformation between roughness and L plates, oil film thickness is not 0 at this time；Rotate the spiral head N of right translation platform 160It is a
Lattice, the height for reducing right L shaped plate 15 in theory are 10 × N0Micron, i.e., at this time on the bottom surface and right L shaped plate 15 of left L shaped plate 10
Theoretical oil film thickness between top surface is 10 × N0Micron, using FFT (Fast Fourier Transform (FFT)) to ultrasonic reflections signal (left L
Reflected signal at 10 bottom surface of shape plate and lubricant interface) spectrum analysis is carried out, obtain reflection coefficient curve；
S4, find the corresponding resonant frequency of minimum point in reflection coefficient curve, and brings following thickness calculation formula into
Solve actual oil film thickness h0：
Wherein h0For actual oil film thickness, c is the velocity of sound in oil film, and m is oil film resonance exponent number, and f is m rank resonant frequencies,
That is the corresponding frequency of reflectance factor minimum point, here with h0Initial or original thickness during as static demarcating；
S5, continue to rotate 16 spiral head N of right translation platform1A lattice, reduce by 10 × N of the right height of L shaped plate 151Micron, to surpassing at this time
Sound wave reflected signal (reflected signal at left 10 bottom surface of L shaped plate and lubrication oil interface) calculates after carrying out FFT transform processing
Actual oil film thickness h can be obtained1, by h1With theoretical oil film thickness h0+10×N1Micron is contrasted and demarcated；
S6, repeat S5, reduces the right height of L shaped plate 15 for continuous more than 3 times, records the oil film thickness actually obtained and theory is oily
Film thickness, and contrasted, finally obtain the static demarcating curve of ultrasonic measurement thickness；
Scaling method described in the present embodiment can reduce calibrated error caused by systematic error and mismachining tolerance, the present embodiment
When middle center probe frequency is 10MHz, its static demarcating curve is as shown in Figure 4.
Embodiment 2：
The agent structure of oil film thickness static demarcating device involved in embodiment 1 includes：Upper plate 1, support leg 2, horizontal stroke
Beam 3, oil groove 4, adjustable support foot 5, connector bar 6, angle adjustable bolt 7, left connection board 8, left platform 9, left L shaped plate 10,
Elasticity adjusting bolt 11, gripping block 12, ultrasonic probe 13, major connector 14, right L shaped plate 15, right translation platform 16, right connection
Plate 17, first shaft coupling 18, ultrasonic wave transmitting/receiving instrument 19, oscillograph 20 and PC machine 21, the upper plate 1 of square platy structure
Four corners be vertically arranged with the support leg 2 to play a supportive role respectively, the bottom of support leg 2 is provided with adjustable support foot 5,
It is described between left side and the adjustable support foot 5 on right side to make 1 holding of upper plate horizontal by adjusting adjustable support foot 5
The crossbeam 3 of its fixation is connected with, the underface of the upper plate 1 is provided with to hold the oil groove 4 of oil sources, the oil groove
4 be upper end uncovered structure；The connector bar 6 is connected through a screw thread with upper plate 1, and leading to through the centre of upper plate 1
Hole and the upper side for extending to upper plate 1, the lower end of the connector bar 6 are provided with first shaft coupling 18, first shaft coupling
The lower end of device 18 is connected with the upper end for the major connector 14 placed vertically, and the lower end of major connector 14 is provided with elasticity gripping block
12, ultrasonic probe 13 is clamped with the gripping block 12, is provided with to adjust the elastic of clamping elasticity in gripping block 12
Spend adjusting bolt 11, elasticity adjusting bolt 11 picks and places and clamp ultrasonic probe 13, and the transmitting of ultrasonic probe 13 is super
Acoustic signals, and the ultrasonic reflections signal of left 10 transverse slat bottom surface of L shaped plate is received, the ultrasonic probe 13 is sent out with ultrasonic wave
Penetrate/receiving instrument 19 connects, ultrasonic wave transmitting/receiving instrument 19 is connected by oscillograph 20 with PC machine 21, to by ultrasonic probe
13 information collected are launched by ultrasonic wave/and receiving instrument 19 received, and shown in oscillograph 20, then pass through PC machine
21 monitorings in real time and calculating；Angular adjustment is provided with for center of circle array with connector bar 6 in the upper side middle of upper plate 1
Bolt 7, angle adjustable bolt 7 is through upper side and its tail end and the upper surface of first shaft coupling 18, to pass through
Angle adjustable bolt 7 finely tunes the pitch angle of first shaft coupling 18；The left and right sides of the first shaft coupling 18 is set respectively
Have a left connection board 8 and right connection board 17, the upper end of the square left connection board 8 placed vertically and right connection board 17 respectively with it is upper
The lower surface connection of top plate 1, the inner side of the left connection board 8 and right connection board 17 is respectively arranged with left platform 9 and right translation
The inner side of platform 16, left platform 9 and right translation platform 16 is respectively arranged with left L shaped plate 10 and right L shaped plate 15, the left platform 9
It is connected with riser of the right translation platform 16 respectively with left L shaped plate 10 and right L shaped plate 15, the left L shaped plate 10 and right L shaped plate 15 are erected
The lower end of plate is respectively transverse slat that is horizontal positioned and extending inwardly, and the transverse slat of the left L shaped plate 10 and right L shaped plate 15 is located at
The downside of ultrasonic probe 13, the left platform 9 and right translation platform 16 adjusting left L shaped plate 10 and right L shaped plate 15 respectively
Transverse slat between relative position relation, and adjust left L shaped plate 10 and right L shaped plate 15 and the relative position relation of oil sources.
Further, the support leg 2 described in the present embodiment is using the aluminum alloy industrial profile frame of 8mm groove widths, shape wheel
Exterior feature has circular arc chamfering, and surface is by anodic oxidation silvery white processing.
Further, the setting quantity of the angle adjustable bolt 7 described in the present embodiment is preferably 6.
Further, the ultrasonic probe 13 described in the present embodiment is water logging type, and center probe frequency response is at least 10MHz.
Further, the left platform 9 described in the present embodiment and right translation platform 16 are manual accurate translation stage, table top ruler
Very little to be at least 65mm × 65mm, carrying is at least 10Kg, and stroke is at least 25mm, minimum scale 10um, and use is high-accuracy
Ball screw drives, and has lateral locking device.
Further, the bottom surface of 10 transverse slat of left L shaped plate described in the present embodiment, the upper top surface of 15 transverse slat of right L shaped plate are equal
Finished using grinding, by being ground finishing to improve machining accuracy, its surface roughness is reduced, so as to reduce rough surface
The influence to oil film thickness measurement accuracy is spent, to ensure the accuracy of test.
Further, the flexible bellow shaft coupling that the first shaft coupling 18 described in the present embodiment is made of aluminum alloy materials
Device.
Further, the left L shaped plate 10 described in the present embodiment and right L shaped plate 15 are using aluminium or stainless steel or other chance water
Rustless metal material, other shop parts select same metal material.
Further, the response pulse duration of ultrasonic wave transmitting/receiving instrument 19 described in the present embodiment is more than or equal to
35MHz。
Further, the oil groove 4 described in the present embodiment is fabricated using transparent material, is preferably organic glass or Asia
Gram force plate is with order to directly observing the formational situation of oil film thickness.
Claims (10)
- A kind of 1. oil film thickness static demarcating method, it is characterised in that this method realizes in oil film thickness static demarcating device, Before the actual measurement oil film thickness using its ultrasonic probe, just need to carry out the calibration of ultrasonic probe equipment, this mark first Fixed operation is only needed when measuring first, the scaling method of the oil film thickness static demarcating method specifically in accordance with the following steps into OK：Adjustable support foot is adjusted after S1, assembling, and is measured with ruler and ensures that four support feets are highly consistent；Horizon rule is put In the short slab part of left L shaped plate, whether observation horizon rule bubble is in center, the pitching position as do not adjusted left L shaped plate if Put so that horizon rule bubble is at center；During static demarcating, the pitch position of right L shaped plate is adjusted according to the method described above so that be placed on The horizon rule bubble of right L shaped plate short slab part is also at center；S2, the spiral head for first rotating right translation platform, raise right L shaped plate so that top surface and left L shaped plate short slab on right L shaped plate short slab Bottom surface contacts, although contacting at this time, due between the flatness of two L shaped plates 15 and 10, the depth of parallelism, roughness and L plates Deformation the problems such as, at this time oil film thickness not be 0；Rotate the spiral head N of right translation platform0A lattice, reduce right L shaped plate in theory Height be 10 × N0Micron, i.e., at this time the theoretical oil film thickness in the bottom surface of left L shaped plate and right L shaped plate between top surface for 10 × N0Micron, using FFT (Fast Fourier Transform (FFT)) to ultrasonic reflections signal (at left L shaped plate bottom surface and lubricant interface Reflected signal) spectrum analysis is carried out, obtain reflection coefficient curve；S3, find the corresponding resonant frequency of minimum point in reflection coefficient curve, and brings following thickness into and calculate equations Actual oil film thickness h0：<mrow> <msub> <mi>h</mi> <mn>0</mn> </msub> <mo>=</mo> <mfrac> <mrow> <mi>c</mi> <mi>m</mi> </mrow> <mrow> <mn>2</mn> <mi>f</mi> </mrow> </mfrac> </mrow>Wherein h0For actual oil film thickness, c is the velocity of sound in oil film, and m is oil film resonance exponent number, and f is m rank resonant frequencies, that is, is reflected The corresponding frequency of coefficient minimum point, here with h0Initial or original thickness during as static demarcating；S4, continue to rotate right translation platform spiral head N1A lattice, reduce by 10 × N of right L shaped plate height1Micron, to ultrasonic reflections at this time Signal (reflected signal at left L shaped plate bottom surface and lubrication oil interface) can be calculated actual oil after carrying out FFT transform processing Film thickness h1, by h1With theoretical oil film thickness h0+10×N1Micron is contrasted and demarcated；S5, repeat S4, reduces right L shaped plate height for continuous more than 3 times, records the oil film thickness actually obtained and theoretical oil film thickness Degree, and contrasted, finally obtain the static demarcating curve of ultrasonic measurement thickness.
- 2. the oil film thickness static demarcating device described in a kind of claim 1, it is characterised in that its agent structure includes：Upper top Plate, support leg, crossbeam, oil groove, adjustable support foot, connector bar, angle adjustable bolt, left connection board, left platform, left L-shaped Plate, elasticity adjusting bolt, gripping block, ultrasonic probe, major connector, right L shaped plate, right translation platform, right connection board, first Axis device, ultrasonic wave transmitting/receiving instrument, oscillograph and PC machine, the four corners of the upper plate of square platy structure are vertically arranged respectively There is the support leg to play a supportive role, the bottom of support leg is provided with adjustable support foot, to by adjusting adjustable support foot Make upper plate holding horizontal, the crossbeam that its fixation is connected between left side and the adjustable support foot on right side, institute State and the oil groove for holding oil sources is provided with immediately below upper plate, the oil groove is upper end uncovered structure；The connector bar It is connected through a screw thread with upper plate, and through the through hole among upper plate and extends to the upper side of upper plate, it is described small The lower end of connecting rod is provided with the upper end company of first shaft coupling, the lower end of the first shaft coupling and the major connector placed vertically Connect, the lower end of major connector is provided with elasticity gripping block, and ultrasonic probe is clamped with the gripping block, is set in gripping block There is to adjust an elasticity adjusting bolt of clamping elasticity, elasticity adjusting bolt picks and places and clamp ultrasonic probe, institute Ultrasonic probe transmitting ultrasonic signal is stated, and receives the ultrasonic reflections signal of left L shaped plate transverse slat bottom surface, the ultrasonic wave is visited Head is connected with ultrasonic wave transmitting/receiving instrument, and ultrasonic wave transmitting/receiving instrument is connected by oscillograph with PC machine, to by ultrasonic wave The information that collects of popping one's head in launched by ultrasonic wave/and receiving instrument received, and come out in oscilloscope display, then to pass through PC machine real When monitoring and calculate；Center of circle array is provided with angle adjustable bolt of connector bar in the upper side middle of upper plate, Angle adjustable bolt is through upper side and its tail end and the upper surface of first shaft coupling, to pass through angular adjustment spiral shell Bolt finely tunes the pitch angle of first shaft coupling；Left connection board and right company are respectively arranged with left and right sides of the first shaft coupling Fishplate bar, the upper end of the square left connection board and right connection board placed vertically is connected with the lower surface of upper plate respectively, described The inner side of left platform and right translation platform, left platform and right translation platform is respectively arranged with the inside of left connection board and right connection board It is respectively arranged with left L shaped plate and right L shaped plate, the left platform and right translation the platform riser with left L shaped plate and right L shaped plate respectively The lower end of the riser of connection, the left L shaped plate and right L shaped plate is respectively transverse slat that is horizontal positioned and extending inwardly, described The transverse slat of left L shaped plate and right L shaped plate is located at the downside of ultrasonic probe, and the left platform and right translation platform adjusting respectively Relative position relation between the transverse slat of left L shaped plate and right L shaped plate, and adjust the opposite of left L shaped plate and right L shaped plate and oil sources Position relationship.
- 3. oil film thickness static demarcating equipment according to claim 2, it is characterised in that the setting number of angle adjustable bolt Amount is preferably 6.
- 4. oil film thickness static demarcating equipment according to claim 2, it is characterised in that ultrasonic probe is water logging type, is visited Head center frequency response is at least 10MHz.
- 5. oil film thickness static demarcating equipment according to claim 2, it is characterised in that left platform and right translation platform are equal For manual accurate translation stage, mesa dimensions should be at least 65mm × 65mm, and carrying is at least 10Kg, and stroke is at least 25mm, most Down scale is 10um, is driven using high-accuracy ball screw, and have lateral locking device.
- 6. oil film thickness static demarcating equipment according to claim 2, it is characterised in that the bottom surface of left L shaped plate transverse slat, Using grinding finishing, by being ground finishing to improve machining accuracy, it is thick to reduce its surface for the upper top surface of right L shaped plate transverse slat Rugosity, so that influence of the surface roughness to oil film thickness measurement accuracy is reduced, to ensure the accuracy of test.
- 7. oil film thickness static demarcating equipment according to claim 2, it is characterised in that first shaft coupling uses aluminium alloy The flexible bellow shaft coupling that material makes.
- 8. oil film thickness static demarcating equipment according to claim 2, it is characterised in that the arteries and veins of ultrasonic wave transmitting/receiving instrument Rush response duration and be more than or equal to 35MHz.
- 9. oil film thickness static demarcating equipment according to claim 2, it is characterised in that oil groove is manufactured using transparent material Form, be preferably organic glass or acrylic board with order to directly observing the formational situation of oil film thickness.
- 10. oil film thickness static demarcating equipment according to claim 2, it is characterised in that support leg uses 6-10mm groove widths Aluminum alloy industrial profile frame, appearance profile has a circular arc chamfering, and surface is by anodic oxidation silvery white processing.
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Application publication date: 20180508 |