CN104819791A - Fiber bragg grating sensor for measuring contact stress at rolling interface - Google Patents
Fiber bragg grating sensor for measuring contact stress at rolling interface Download PDFInfo
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- CN104819791A CN104819791A CN201510193289.8A CN201510193289A CN104819791A CN 104819791 A CN104819791 A CN 104819791A CN 201510193289 A CN201510193289 A CN 201510193289A CN 104819791 A CN104819791 A CN 104819791A
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Abstract
The invention discloses a fiber bragg grating sensor for measuring the contact stress at a rolling interface. The fiber bragg grating sensor comprises a roller. The surface of the roller is provided with a stepped hole. One face, perpendicular to the axis direction of the roller, of the stepped hole is milled flat and milled with a slot. A fiber bragg grating strain rosette is adhered to the slot. A plug is located at the upper portion of the stepped hole. The stepped hole is provided internally with a slender hole to the axis of the roller. The axis at an operating side of the roller is provided with a hole communicating with the slender hole. The fiber bragg grating strain rosette is connected a fiber collimator A through an optical cable. The fiber collimator A is fixed at the opening of the hole of the axis at the operating side of the roller through a collimator fixing sleeve. A fiber collimator B is mounted on a three-dimensional micro displacement adjustment table. The fiber collimator B is further connected with a fiber bragg grating wavelength demodulator. The fiber bragg grating wavelength demodulator is connected with a computer. According to the invention, through indirect measurement of normal stress and shearing stress at the rolling interface, impression can be avoided on a plate and tape and no disturbances will be generated to friction and lubrication at the rolling interface.
Description
Technical field
The present invention relates to board rolling field, specifically a kind of fiber-optic grating sensor measuring Interface of Rolling place contact stress.
Background technology
In plate strip rolling process, two rolls are used to reduce the thickness of rolled piece as instrument.Current rolling trend is: higher mill speed, larger drafts, harder steel grade grade and thinner Strip.In order to ensure better product quality, especially at thickness, these aspects such as flatness and defect-free surface, the friction in roll gap and lubrication knowledge become particularly crucial, therefore require to know the contact position place normal stress between strip and roll and shear stress.Measure the contact stress at roll gap place, thus obtain the optimized parameter of mill speed and lubrication, this is the importance in rolling field always.
In current measurement plate strip rolling process, the sensor of Interface of Rolling contact stress mainly contains three kinds:
The first is the sensor of direct needle-like, the needle for measuring blood pressue that mainly employing two sectional dimensions are very little directly measures normal pressure and shear stress, the key constraints of this sensor is that needle for measuring blood pressue directly contacts with strip, impression can be left in strip, and in order to can accurately monitor strain better, the ratio of rigidity at needle for measuring blood pressue place is lower, can cause when rolling than around the higher elastic deformation of roll, thus certain disturbance can be produced to Interface of Rolling place andfrictional conditions;
The second is the sensor of measuring unit's pressure that size is also larger than contact arc length and friction force, from the side, it is frame-type, there are two columns, each column is equipped with two strainmeters measuring vertical and horizontal stress, enter the change in location of work roll gap and four measuring-signals of strainmeter according to sensor, just can determine the unit pressure on arc of contact on each position and friction force; Problem on deformation is crossed in the local that this sensor overcomes above-mentioned needle for measuring blood pressue, but also can contact with strip due to this sensor, thus also can leave impression in rolling strip;
The third is roll sensor, and roll is sensor inherently, by measuring the elastic strain of working roll inner diverse location place roll in the operation of rolling, and applying a kind of mechanical back analysis, can recalculate Interface of Rolling place normal stress and shear stress; The maximum benefit of this sensor directly need not contact strip, but indirect inspection Interface of Rolling place contact stress, thus avoid the disturbance of to leave a trace in strip and to the friction of roll gap place and lubrication.
At present, roll sensor is only pasted strainometer in experimental mill topping roll edge and is realized, and on industrial rolling mills, roll is wider than strip, and roll edge does not contact with strip.
Summary of the invention
The object of the present invention is to provide a kind of fiber-optic grating sensor measuring Interface of Rolling place contact stress, by measuring the strain of roll inner elastomeric thus inverting backstepping obtains Interface of Rolling contact stress, directly need not contact strip, thus avoid and in strip, to leave impression and disturbance can not be produced to the friction at Interface of Rolling place and lubrication.
For achieving the above object, the invention provides following technical scheme:
Measure a fiber-optic grating sensor for Interface of Rolling place contact stress, comprise fiber grating strain flower, roll, chock, optical cable, optical fiber collimator A, collimating apparatus fixed cover, optical fiber collimator B and three-dimensional micrometric displacement regulating platform; The rolling overlying regions of described roller surface has a stepped bore; The vertical roller axis direction one side of described stepped bore is put down by milling, is milled with slit simultaneously; Described fiber grating strain flower is pasted onto slit place; Described chock is positioned at the upper part of stepped bore; Described stepped bore inside has the elongated hole that arrives roll axis place, and described roll operation side shaft line place has a hole through with this elongated hole; One end of described optical cable is connected with fiber grating strain flower, and the other end of described optical cable is connected with optical fiber collimator A; Described optical fiber collimator A is fixed on the aperture place of roll operation side shaft line by collimating apparatus fixed muffle; Described optical fiber collimator B is arranged on three-dimensional micrometric displacement regulating platform, ensures that optical fiber collimator A6 and optical fiber collimator B8 aims at by three-dimensional micrometric displacement regulating platform; Described optical fiber collimator B is connected to optical fiber raster wavelength demodulator again; Described optical fiber raster wavelength demodulator connects computing machine.
As the further scheme of the present invention: described fiber grating strain flower is 45 °, right angle strain rosette, and be made up of 3 FBG optical fiber realizing accurate distribution, the quantity of described slit is 3.
As the further scheme of the present invention: described fiber grating strain flower is pasted onto distance roller surface 3mm place.
As the further scheme of the present invention: leave space between described fiber grating strain flower and optical cable, described gap is filled with resin.
As the further scheme of the present invention: described chock is connected with roll by screw.
As the further scheme of the present invention: after described chock coordinates with roll, chock surface is polished smooth.
As the further scheme of the present invention: its method of testing is: the light signal that described optical fiber raster wavelength demodulator sends is sent to optical fiber collimator A by optical fiber collimator B, be sent to fiber grating strain flower again, the light signal that described fiber grating strain flower is reflected back specific wavelength again through optical fiber collimator A to optical fiber collimator B, be resent to optical fiber raster wavelength demodulator, described optical fiber raster wavelength demodulator is connected with computing machine.
Compared with prior art, the invention has the beneficial effects as follows: the present invention is a kind of method of indirect inspection Interface of Rolling contact stress, by measuring the strain of roll inner elastomeric thus inverting backstepping obtains normal stress and the shear stress at Interface of Rolling place, do not need directly to contact strip, and embed inner fiber grating strain flower and can not change as-rolled condition, thus avoid and in strip, to leave impression and disturbance can not be produced to the friction at Interface of Rolling place and lubrication.The present invention can realize normal stress and the shear stress of measuring Interface of Rolling place in real time, tentatively can realize the measurement to Interface of Rolling place contact stress on industrial rolling mills.
Accompanying drawing explanation
Fig. 1 is a kind of one-piece construction schematic diagram measuring the fiber-optic grating sensor of Interface of Rolling place contact stress;
Fig. 2 is a kind of B partial schematic diagram measuring the fiber-optic grating sensor of Interface of Rolling place contact stress;
Fig. 3 is a kind of A-A diagrammatic cross-section measuring the fiber-optic grating sensor of Interface of Rolling place contact stress;
Fig. 4 is that schematic diagram put by a kind of fiber grating strain figured cloth measuring the fiber-optic grating sensor of Interface of Rolling place contact stress;
Fig. 5 is a kind of test block diagram measuring the fiber-optic grating sensor of Interface of Rolling place contact stress;
Fig. 6 is a kind of back analysis process flow diagram measuring the fiber-optic grating sensor of Interface of Rolling place contact stress;
In figure: 1-fiber grating strain flower, 2-roll, 3-chock, 4-screw, 5-optical cable, 6-optical fiber collimator A, 7-collimating apparatus fixed muffle, the three-dimensional micrometric displacement regulating platform of 8-optical fiber collimator B, 9-.
Embodiment
Below in conjunction with the embodiment of the present invention and accompanying drawing, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
Refer to Fig. 1-Fig. 4, in the embodiment of the present invention, a kind of fiber-optic grating sensor measuring Interface of Rolling place contact stress, comprises fiber grating strain and spends 1, roll 2, chock 3, screw 4, optical cable 5, optical fiber collimator A6, collimating apparatus fixed muffle 7, optical fiber collimator B8, three-dimensional micrometric displacement regulating platform 9.Roller surface rolling overlying regions has a stepped bore; hole one facing cut is put down by vertical axis direction; mill out 3 slits simultaneously; 1 is spent by fiber grating strain to be pasted onto this slit place; the surperficial 3mm of distance roll 2, pastes chock 3 and inserts in this stepped bore, connect with two screws 4; fiber grating strain spend 1 and optical cable 5 place leave space, be filled with in space resin protection fiber grating strain spend 1.Stepped bore inside has elongated hole and two threaded holes that arrives roll 2 axis place, a hole is opened and this elongated hole is through from roll 2 fore side axis, be convenient to optical cable 5 like this and spend 1 extraction from fiber grating strain, through roll mandrel string holes out, connecting fiber collimating apparatus A6, optical fiber collimator A6 is fixed on roll 2 axis aperture place by collimating apparatus fixed muffle 7, optical fiber collimator B8 is arranged on three-dimensional micrometric displacement regulating platform 9, thus adjustment optical fiber collimator B8 ensures that optical fiber collimator A6 and optical fiber collimator B8 aims at, optical fiber collimator A6 and optical fiber collimator B8 is used for ensureing that light signal does not interrupt because of rotation, optical fiber collimator B8 is connected to optical fiber raster wavelength demodulator again, optical fiber raster wavelength demodulator connects computing machine.Like this when rolling, computing machine just can obtain the stress value at the inner radial distance surperficial 3mm place of roll 2, can obtain the normal stress at Interface of Rolling place and the value of shear stress in real time by the Inversion Calculation program finished in advance.
Described fiber grating strain spends 1 for 45 °, right angle strain rosette, according to FBG wavelength-division multiplex principle, make full use of the advantage that it can realize quasi-distributed measurement, 45 °, the right angle strain rosette utilizing 3 different FBG of the wavelength of the accurate distribution of realization on a single-mode fiber to make, reaches the number saving detuner passage.Fiber grating strain spends 1 to be pasted onto the distance surperficial 3mm place of roll 2.
Described roll 2 surface rolling overlying regions has a stepped bore; hole one facing cut is put down by vertical axis direction; mill out 3 slits simultaneously; being convenient to fiber grating strain spends 1 to be arranged on this slit place; stairstepping is arranged in this hole; be convenient to chock 3 and can cover this stepped bore, spend 1 to protect fiber grating strain.
Described chock 3 ensure stepped bore on the surface part cover completely, lower part ensure fiber grating strain spend 1 and optical cable 5 can be interference-free, thus reach and can closely fill this stepped bore.Chock 3 is connected by two screws 4 with roll 2, and after chock 3 coordinates with roll 2, this surface grinding is smooth.
Spend to leave between 1 and optical cable 5 at the fiber grating strain of stepped bore inside and remain space, be used for filling out resin, resin covers fiber grating strain and spends on 1, spends 1 to play a protective role to fiber grating strain.
Refer to Fig. 5, when the present invention uses, the light signal that optical fiber raster wavelength demodulator sends is sent to optical fiber collimator A6 by optical fiber collimator B8, be sent to fiber grating strain again and spend 1, fiber grating strain spend 1 to be reflected back specific wavelength light signal again through optical fiber collimator A6 to optical fiber collimator B8, be resent to optical fiber raster wavelength demodulator, optical fiber raster wavelength demodulator is connected with computing machine.Like this when rolling, computing machine just can obtain the stress value at the inner radial distance surperficial 3mm place of roll 2, can obtain the normal stress at Interface of Rolling place and the value of shear stress in real time by the Inversion Calculation program finished in advance.
Refer to Fig. 6, inversion algorithm theory of program: the radius of a circle of measured value is
, the radius of roll itself is
, in formula below, subscript c means relevant with the circle of measured value, and subscript d means relevant with roll cross section circle.Under isothermal hypothesis, the elastic equation of isotropic material can by Muskhelishvili (2008) (Muskhelishvili, N., 1953. Singular Integral Equations:Boundary Problems of Function Theory and Their Application to Mathematical Physics, 1st ed. Dover, New York, pp. 316 – 322) provide:
（1）
Wherein
(2)
Here
for radial stress,
for circumference stress,
for shear stress, complex potential
with
power series can be expanded to, so:
（3）
The present invention is a kind of method of indirect inspection Interface of Rolling contact stress, by measuring the strain of roll inner elastomeric thus inverting backstepping obtains normal stress and the shear stress at Interface of Rolling place, do not need directly to contact strip, and embed inner fiber grating strain flower and can not change as-rolled condition, thus avoid and in strip, to leave impression and disturbance can not be produced to the friction at Interface of Rolling place and lubrication.The present invention can realize normal stress and the shear stress of measuring Interface of Rolling place in real time, tentatively can realize the measurement to Interface of Rolling place contact stress on industrial rolling mills.
To those skilled in the art, obviously the invention is not restricted to the details of above-mentioned one exemplary embodiment, and when not deviating from spirit of the present invention or essential characteristic, the present invention can be realized in other specific forms.Therefore, no matter from which point, all should embodiment be regarded as exemplary, and be nonrestrictive, scope of the present invention is limited by claims instead of above-mentioned explanation, and all changes be therefore intended in the implication of the equivalency by dropping on claim and scope are included in the present invention.
In addition, be to be understood that, although this instructions is described according to embodiment, but not each embodiment only comprises an independently technical scheme, this narrating mode of instructions is only for clarity sake, those skilled in the art should by instructions integrally, and the technical scheme in each embodiment also through appropriately combined, can form other embodiments that it will be appreciated by those skilled in the art that.
Claims (7)
1. measure a fiber-optic grating sensor for Interface of Rolling place contact stress, it is characterized in that, comprise fiber grating strain flower, roll, chock, optical cable, optical fiber collimator A, collimating apparatus fixed cover, optical fiber collimator B and three-dimensional micrometric displacement regulating platform; The rolling overlying regions of described roller surface has a stepped bore; The vertical roller axis direction one side of described stepped bore is put down by milling, is milled with slit simultaneously; Described fiber grating strain flower is pasted onto slit place; Described chock is positioned at the upper part of stepped bore; Described stepped bore inside has the elongated hole that arrives roll axis place, and described roll operation side shaft line place has a hole through with this elongated hole; One end of described optical cable is connected with fiber grating strain flower, and the other end of described optical cable is connected with optical fiber collimator A; Described optical fiber collimator A is fixed on the aperture place of roll operation side shaft line by collimating apparatus fixed muffle; Described optical fiber collimator B is arranged on three-dimensional micrometric displacement regulating platform, ensures that optical fiber collimator A6 and optical fiber collimator B8 aims at by three-dimensional micrometric displacement regulating platform; Described optical fiber collimator B is connected to optical fiber raster wavelength demodulator again; Described optical fiber raster wavelength demodulator connects computing machine.
2. the fiber-optic grating sensor of measurement Interface of Rolling place according to claim 1 contact stress, it is characterized in that, described fiber grating strain flower is 45 °, right angle strain rosette, and be made up of 3 FBG optical fiber realizing accurate distribution, the quantity of described slit is 3.
3. the fiber-optic grating sensor of measurement Interface of Rolling place according to claim 1 contact stress, is characterized in that, described fiber grating strain flower is pasted onto distance roller surface 3mm place.
4. the fiber-optic grating sensor of measurement Interface of Rolling place according to claim 1 contact stress, is characterized in that, leave space between described fiber grating strain flower and optical cable, described gap is filled with resin.
5. the fiber-optic grating sensor of measurement Interface of Rolling place according to claim 1 contact stress, it is characterized in that, described chock is connected with roll by screw.
6. the fiber-optic grating sensor of measurement Interface of Rolling place according to claim 1 contact stress, is characterized in that, after described chock coordinates with roll, chock surface is polished smooth.
7. the fiber-optic grating sensor of measurement Interface of Rolling place according to claim 1 contact stress, it is characterized in that, its method of testing is: the light signal that described optical fiber raster wavelength demodulator sends is sent to optical fiber collimator A by optical fiber collimator B, be sent to fiber grating strain flower again, the light signal that described fiber grating strain flower is reflected back specific wavelength again through optical fiber collimator A to optical fiber collimator B, be resent to optical fiber raster wavelength demodulator, described optical fiber raster wavelength demodulator is connected with computing machine.
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| CN201510193289.8A CN104819791B (en) | 2015-04-22 | 2015-04-22 | A kind of fiber-optic grating sensor for measuring contact stress at Interface of Rolling |
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| CN201510193289.8A CN104819791B (en) | 2015-04-22 | 2015-04-22 | A kind of fiber-optic grating sensor for measuring contact stress at Interface of Rolling |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113884228A (en) * | 2021-09-29 | 2022-01-04 | 燕山大学 | Metallized fiber grating stress sensor suitable for cold-rolled plate shape detection |
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2015
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113884228A (en) * | 2021-09-29 | 2022-01-04 | 燕山大学 | Metallized fiber grating stress sensor suitable for cold-rolled plate shape detection |
| CN113884228B (en) * | 2021-09-29 | 2024-03-26 | 燕山大学 | Metallized fiber bragg grating stress sensor suitable for cold-rolled sheet shape detection |
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