CN106525037B - The method of large-caliber thin-walled iron-nickel alloy material deformation is reduced in optical fiber inertial navigation - Google Patents
The method of large-caliber thin-walled iron-nickel alloy material deformation is reduced in optical fiber inertial navigation Download PDFInfo
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- CN106525037B CN106525037B CN201611151282.0A CN201611151282A CN106525037B CN 106525037 B CN106525037 B CN 106525037B CN 201611151282 A CN201611151282 A CN 201611151282A CN 106525037 B CN106525037 B CN 106525037B
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- pedestal
- nickel alloy
- optical fiber
- inertial navigation
- cover board
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
- G01C21/00—Navigation; Navigational instruments not provided for in groups G01C1/00 - G01C19/00
- G01C21/10—Navigation; Navigational instruments not provided for in groups G01C1/00 - G01C19/00 by using measurements of speed or acceleration
- G01C21/12—Navigation; Navigational instruments not provided for in groups G01C1/00 - G01C19/00 by using measurements of speed or acceleration executed aboard the object being navigated; Dead reckoning
- G01C21/16—Navigation; Navigational instruments not provided for in groups G01C1/00 - G01C19/00 by using measurements of speed or acceleration executed aboard the object being navigated; Dead reckoning by integrating acceleration or speed, i.e. inertial navigation
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K31/00—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups
- B23K31/003—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups relating to controlling of welding distortion
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
- G01C19/00—Gyroscopes; Turn-sensitive devices using vibrating masses; Turn-sensitive devices without moving masses; Measuring angular rate using gyroscopic effects
- G01C19/58—Turn-sensitive devices without moving masses
- G01C19/64—Gyrometers using the Sagnac effect, i.e. rotation-induced shifts between counter-rotating electromagnetic beams
- G01C19/72—Gyrometers using the Sagnac effect, i.e. rotation-induced shifts between counter-rotating electromagnetic beams with counter-rotating light beams in a passive ring, e.g. fibre laser gyrometers
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Electromagnetism (AREA)
- Power Engineering (AREA)
- Automation & Control Theory (AREA)
- Mechanical Engineering (AREA)
- Light Guides In General And Applications Therefor (AREA)
- Mechanical Coupling Of Light Guides (AREA)
Abstract
The present invention relates to optical fiber inertial navigation fields, more particularly, to a kind of method for reducing large-caliber thin-walled iron-nickel alloy material deformation in optical fiber inertial navigation.The method that large-caliber thin-walled iron-nickel alloy material deformation is reduced in optical fiber inertial navigation is that sensitive components is arranged in the first assembly section, and cover board and pedestal are welded, and positioning aluminum component is coaxially fitted into the second assembly section；The cross section of annular baffle is right-angled trapezium, and bevel edge is in the side of the second assembly section, and smaller bottom edge is in the side of cover board.The present invention realizes that part deformation is small, and structure is simple, and weight facilitates processing almost without big increase, and precision is controllable, stable structure, is suitble to the advantages that producing in enormous quantities.
Description
Technical field
The present invention relates to optical fiber inertial navigation fields, reduce large-caliber thin-walled iron nickel in optical fiber inertial navigation more particularly, to one kind and close
The method of golden material deformation.
Background technique
Iron-nickel alloy is a kind of low frequency soft magnetic materials in low-intensity magnetic field with high magnetic permeability and low-coercivity；Containing Ni78%
Magnetic conductivity of the iron-nickel alloy in low-intensity magnetic field it is about 10~20 times higher than silicon steel, be commonly used to sensitive relay, magnetic screen, phone
With in wireless transformer, accurate AC and DC instrument, current transformer and inertial navigation optical fibre gyro or its
To shield interference of the earth's magnetic field to sensitive components in the gyro of his type；The hardness of general bar iron-nickel alloy is HRC24-
28, the abrasion processed using general hard alloy cutter is very big, and the iron due to there is magnetic conductivity iron-nickel alloy in processing
Bits can be adsorbed on alloy cutter, in order to avoid problem above generally uses superhard cutter such as sintex to be processed；It adopts
Very big internal stress can be generated by processing bigbore thin wall iron-nickel alloy material with this superhard cutter, be concentrated on thin-walled,
Cause to generate a part of deformation, and finish completion after iron-nickel alloy is heat-treated, heat treatment after it is also right
Iron-nickel alloy carry out laser welding, this when, stress can discharge, increase thin-walled deflection, not can guarantee concentricity and circularity into
And the optical fibre gyro for being unable to satisfy the needs of design and producing, and producing in this way, service life and accuracy will be by
To influence.
Summary of the invention
The purpose of the present invention is to provide a kind of to reduce large-caliber thin-walled iron-nickel alloy material deformation in optical fiber inertial navigation
Method, to solve the technical problems existing in the prior art.
The method that the present invention provides a kind of to reduce large-caliber thin-walled iron-nickel alloy material deformation in optical fiber inertial navigation, i.e., will
Sensitive components is arranged in the first assembly section of pedestal, and cover board and the pedestal are welded, and positioning aluminum component is coaxially fitted into
In second assembly section of the pedestal；
The cross section of annular baffle between first assembly section and second assembly section is right-angled trapezium, and described
The bevel edge of right-angled trapezium is positioned close to the side of second assembly section, and the smaller bottom edge of the right-angled trapezium is positioned close to
The side of cover board.
Further, the sequence of the cover board and pedestal welding are as follows: the position of first welded cover plate outer diameter and base into contact
It sets, then the position of welded cover plate internal diameter and base into contact.
Further, the method for the cover board correction deformation are as follows: flattened on platform using weight.
Further, the diameter difference at second assembly section both ends is greater than or equal to 0.8mm.
Further, the maximum gauge of the pedestal is greater than or equal to 80mm.
Further, it is first heat-treated before pedestal and cover board welding.
Further, the temperature of heat treatment is greater than 1100 DEG C.
Further, processing is fixed in the pedestal domestic demand in the sensitive components.
Further, the material of the pedestal and the cover board is iron-nickel alloy.
The method provided by the invention that large-caliber thin-walled iron-nickel alloy material deformation is reduced in optical fiber inertial navigation, by the first dress
Cross section with the annular baffle between area and the second assembly section is right-angled trapezium, and the bevel edge of right-angled trapezium is positioned close to the
The side of two assembly sections, the smaller bottom edge of right-angled trapezium are positioned close to the side of cover board, realize bigbore iron-nickel alloy
Thin wall component deformation is small, and structure is simple, and weight facilitates processing almost without big increase, and precision is controllable, stable structure, fits
Close the advantages that producing in enormous quantities.
Detailed description of the invention
It, below will be to specific in order to illustrate more clearly of the specific embodiment of the invention or technical solution in the prior art
Embodiment or attached drawing needed to be used in the description of the prior art be briefly described, it should be apparent that, it is described below
Attached drawing is some embodiments of the present invention, for those of ordinary skill in the art, before not making the creative labor
It puts, is also possible to obtain other drawings based on these drawings.
Fig. 1 is the top view of optical fiber loop assembly provided in an embodiment of the present invention；
Fig. 2 is the A-A cross-sectional view of Fig. 1；
Fig. 3 is the top view of the pedestal of optical fiber loop assembly provided in an embodiment of the present invention；
Fig. 4 is the B-B cross-sectional view of Fig. 3.
Appended drawing reference:
1: cover board；2: annular baffle；3: positioning aluminum component；4: sensitive components；5: pedestal；6: the first weld seams；7: the second welderings
Seam；8: the first assembly sections；9: the second assembly sections.
Specific embodiment
Technical solution of the present invention is clearly and completely described below in conjunction with attached drawing, it is clear that described implementation
Example is a part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, ordinary skill
Personnel's every other embodiment obtained without making creative work, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that term " center ", "upper", "lower", "left", "right", "vertical",
The orientation or positional relationship of the instructions such as "horizontal", "inner", "outside" be based on the orientation or positional relationship shown in the drawings, merely to
Convenient for description the present invention and simplify description, rather than the device or element of indication or suggestion meaning must have a particular orientation,
It is constructed and operated in a specific orientation, therefore is not considered as limiting the invention.
In addition, term " first ", " second ", " third " are used for description purposes only, it is not understood to indicate or imply phase
To importance.
In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, term " installation ", " phase
Even ", " connection " shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or be integrally connected；It can
To be mechanical connection, it is also possible to be electrically connected；It can be directly connected, can also can be indirectly connected through an intermediary
Connection inside two elements.For the ordinary skill in the art, above-mentioned term can be understood at this with concrete condition
Concrete meaning in invention.
The method that the present invention provides a kind of to reduce large-caliber thin-walled iron-nickel alloy material deformation in optical fiber inertial navigation, i.e., will
Sensitive components 4 is arranged in the first assembly section 8 of pedestal 5, and cover board 1 and the pedestal 5 are welded, and positioning aluminum component 3 is coaxial
It fits into the second assembly section 9 of the pedestal 5；
The cross section of annular baffle 2 between first assembly section 8 and second assembly section 9 is right-angled trapezium, and
The bevel edge of the right-angled trapezium is positioned close to the side of second assembly section 9, the smaller bottom edge setting of the right-angled trapezium
In the side close to cover board 1.
In the present embodiment, by the cross section of the annular baffle 2 between the first assembly section 8 of pedestal 5 and the second assembly section 9
Be set as right-angled trapezium, and the side of the second assembly section 9 is arranged in the bevel edge of right-angled trapezium, can in the second assembly section 9
Positioning aluminum component 3 fits, and the side of cover board 1 is arranged in the smaller bottom edge of right-angled trapezium, can be convenient for the assembly of positioning aluminum component 3.
Pedestal 5 is processed by lathe into turnery processing or other modes.
After processing is completed to pedestal 5, sensitive components 4 is arranged in the first assembly section 8, is later welded on cover board 1
On pedestal 5, the encapsulation of sensitive components 4 is completed, finally positioning aluminum component 3 is encased in the second assembly section 9.
Such setting enables the side wall of the second assembly section 9 of pedestal 5 to overcome various stress, deflection very little, very
Pedestal 5 will not be extremely set to generate strain, also there is no need to repeat to modify workpiece, after a process is completed, so that it may complete big
Diameter positions the assembly of aluminum component 3, and quality meets the requirement of mass production almost without big increase.
Preferred embodiment is the sequence of the cover board 1 and the pedestal 5 welding are as follows: first 1 outer diameter of welded cover plate and base
The position of 5 contact of seat, then the position that 1 internal diameter of welded cover plate is contacted with pedestal 5.
As depicted in figs. 1 and 2, cover board 1 has the place combined at two to be welded with pedestal 5, in cover board 1 and pedestal
5 when being welded, and welding causes to deform in order to prevent, in order to guarantee the weld strength of pedestal 5 Yu cover board 1, and it is quick in order to guarantee
The packaged stability for feeling component 4 welds cover board 1 by the way of tooling crimping.
In the present embodiment, the welding sequence of cover board 1 and pedestal 5 are as follows: the position that first 1 outer diameter of welded cover plate is contacted with pedestal 5
It sets, then the position that 1 internal diameter of welded cover plate is contacted with pedestal 5.
Preferred embodiment is the method for the correction of cover board 1 deformation are as follows: flattened on platform using weight.
After cutting force, clamping force, heat treatment, stress is also easy to the thin-walled lid panel 1 of heavy caliber iron-nickel alloy
Deformation, but cover board 1 is plate class formation, can be placed into marble platform or other more smooth rigid planars,
The problem of cover board 1 deforms can be corrected by the way of weight pressure.
It should be pointed out that in the present embodiment, the method for the correction deformation of cover board 1 is to be flattened using weight, but it is not only
It is limited only to such a mode, can also be and deformed by squeezing correction cover board 1, that is to say, that as long as it can will be covered
The deformation of plate 1 is corrected.
Preferred embodiment is that the diameter difference at 9 both ends of the second assembly section is greater than or equal to 0.8mm.
In the present embodiment, to guarantee not occur stress deformation, the diameter difference at the both ends of the second assembly section 9 needs to be greater than
Or it is equal to 0.8mm, that is to say, that diameter difference can be 1mm, 1.5mm, 2mm or even bigger, can guarantee have enough in this way
Gradient in the case where, guarantee pedestal 5 stress deformation does not occur.
Preferred embodiment is that the maximum gauge of the pedestal 5 is greater than or equal to 80mm.
When the maximum gauge of pedestal 5 is greater than or equal to 80mm, can just be easier that stress deformation occurs, that is to say, that
The present invention is just applicable in the case where being relatively large in diameter in pedestal 5.
When the diameter of pedestal 5 is less than 80mm, the stress deformation occurred is smaller, and stress deformation will not even occur.
When the stress deformation that pedestal 5 occurs is smaller, if the use for not influencing integral product, so that it may not to pedestal
5 are adjusted, influenced integral product in use, can by the diameter difference of the second assembly section 9 be arranged it is more small by one
A bit, such as 0.6mm, 0.5mm, that is to say, that the diameter difference of the second assembly can carry out appropriate according to the maximum gauge of pedestal 5
Adjustment.
Preferred embodiment is first to be heat-treated before pedestal 5 and the welding of cover board 1.
Heat treatment refers to material in the solid state, by the means of heating, heat preservation and cooling, to obtain intended tissue and performance
A kind of metal heat processing technique.
Metal heat treatmet is one of the important process in machine-building, and compared with other processing technologys, heat treatment is general not
Change the shape and whole chemical component of workpiece, but by the microscopic structure of change inside workpiece, or change workpiece surface
Chemical component, assign or improve workpiece service performance.Its main feature is that improve the inherent quality of workpiece, and this is generally not meat
What eye can be seen.
In the present embodiment, it before being welded to pedestal 5 and cover board 1, is first heat-treated, 5 He of pedestal can be changed
The mechanical property of cover board 1 allows it to the use standard for reaching optical fiber inertial navigation.
Preferred embodiment is that the temperature of heat treatment is greater than 1100 DEG C.
Heat treatment process generally comprises heating, heat preservation, cooling three processes, sometimes only heating and cooling two processes.
These processes overlap, and can not be interrupted.
Heating is one of the important procedure of heat treatment.There are many heating means of metal heat treatmet, be earliest using charcoal and
Coal closely applies liquids and gases fuel as heat source.Electric is easily controllable using making to heat, and non-environmental-pollution.Utilize this
A little heat sources can directly heat, and can also carry out indirect heating down to floating particles by the salt or metal of melting.
Heating temperature is one of important technical parameter of heat treatment process, and selection and control heating temperature, are guaranteed at heat
Manage the main problem of quality.Heating temperature is different and different with the purpose of heat treatment with processed metal material, but is typically all
It is heated to phase transition temperature or more, to obtain high temperature microstructure.
In the present embodiment, in order to guarantee the effect being heat-treated, the temperature of heating is needed at 1100 DEG C or more, to guarantee to obtain
The mechanical property that must be needed.
Preferred embodiment is that processing is fixed in 5 domestic demand of pedestal in the sensitive components 4.
In order to guarantee sensitive components 4 will not due to optical fibre gyro rotation and cause sensitive components 4 follow rotation or
It shakes, will not be damaged further for guarantee sensitive components 4, need for sensitive components 4 to be fixed in pedestal 5.
In the present embodiment, the mode fixed in pedestal 5 of sensitive components 4 is bonding.
The material of the pedestal 5 and the cover board 1 is iron-nickel alloy.
Have above-mentioned as can be seen that the present invention produces the main method of optical fibre gyro are as follows: completion heavy caliber iron-nickel alloy first
Thin-walled lid panel 1 and bigbore iron-nickel alloy pedestal 5 machining, due to the factor of cutting force and clamping force cause it is thin
The deformation of wall cover board 1 and pedestal 5；Then will thin-walled lid panel 1 and bigbore iron-nickel alloy to heavy caliber iron-nickel alloy base
Seat 5 carries out the heat treatment greater than 1100 DEG C, due to stress release so that on the basis of original deformation further Superposed Deformation；
Then the pedestal 5 of the thin-walled lid panel 1 of heavy caliber iron-nickel alloy and bigbore iron-nickel alloy leads to for wrapping up sensitive components 4
It crosses after the fixed sensitive components 4 of certain mode, the thin-walled lid panel 1 of heavy caliber iron-nickel alloy and the base of bigbore iron-nickel alloy
Place of the seat 5 as 1 and Fig. 2 is shown with combination at two in figure will carry out soldering and sealing, and welding causes to deform in order to prevent, using tooling pressure
The mode connect first welds the first weld seam 6, then welds the second weld seam 7；The thin-walled lid of heavy caliber iron-nickel alloy after welding is completed
Plate 1, sensitive components 4, bigbore iron-nickel alloy pedestal 5 become one it is complete whole, later with the positioning of major diameter
Aluminum component 3 assembles；Since the positioning aluminum component 3 of major diameter has positioning action to the pedestal 5 of bigbore iron-nickel alloy, it is desirable that heavy caliber
Iron-nickel alloy pedestal 5 inner sidewall and major diameter positioning aluminum component 3 outer circle have certain concentricity and tolerance fit want
It asks, but the pedestal 5 of bigbore iron-nickel alloy passes through cutting force, clamping force, the stress of heat treatment, welding stress, in thickness
If the inner sidewall for a is designed according to the isodiametric method structure of dotted line in figure, very big shape will be had occurred in inner sidewall
Become, is unable to complete the assembling with the positioning aluminum component 3 of major diameter, design requirement is not achieved, and have verified that in actual production
This problem；If designing an inclined-plane in the face that the positioning aluminum component 3 of inner sidewall a and major diameter cooperate, this inclined-plane is not needed yet
It tilts very much, as long as the radius size of the inner sidewall bottom in figure is than the top inner sidewall radius size difference C >=0.4mm, so that it may
So that inner sidewall a can overcome various stress, deflection very little does not need to repeat to modify workpiece, after a process completion,
The assembly of the positioning aluminum component 3 of major diameter can be completed, and quality meets mass production almost without big increase
It is required that this method is verified in practice, meet the above feature.
It is generally acknowledged that the iron-nickel alloy of diameter D >=80mm is heavy caliber class thin wall iron-nickel alloy material in this method application
Material, and it is easy to appear problem deformed above.
Stress of the thin-walled lid of heavy caliber iron-nickel alloy by cutting force, clamping force, heat treatment is also easily deformed, still
Cover board 1 is plate class formation, can be placed into marble platform by the way of weight pressure the problem of capable of correcting deformation.
The method provided by the invention that large-caliber thin-walled iron-nickel alloy material deformation is reduced in optical fiber inertial navigation, by the first dress
Cross section with the annular baffle 2 between area 8 and the second assembly section 9 is right-angled trapezium, and the bevel edge setting of right-angled trapezium is being leaned on
The side of nearly second assembly section 9, the smaller bottom edge of right-angled trapezium are positioned close to the side of cover board 1, realize bigbore iron
The deformation of nickel alloy thin wall component is small, and structure is simple, and weight facilitates processing almost without big increase, and precision is controllable, structure is steady
Fixed, suitable the advantages that producing in enormous quantities.
Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention., rather than its limitations；To the greatest extent
Pipe present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that: its according to
So be possible to modify the technical solutions described in the foregoing embodiments, or to some or all of the technical features into
Row equivalent replacement；And these are modified or replaceed, various embodiments of the present invention technology that it does not separate the essence of the corresponding technical solution
The range of scheme.
Claims (7)
1. a kind of method for reducing large-caliber thin-walled iron-nickel alloy material deformation in optical fiber inertial navigation, which is characterized in that will be sensitive
Component is arranged in the first assembly section of pedestal, and cover board and the pedestal are welded, and positioning aluminum component is coaxially fitted into described
In second assembly section of pedestal；
The cross section of annular baffle between first assembly section and second assembly section is right-angled trapezium, and the right angle
Trapezoidal bevel edge is positioned close to the side of second assembly section, and the smaller bottom edge of the right-angled trapezium is positioned close to cover board
Side；
The maximum gauge of the pedestal is greater than or equal to 80mm, and the radius size ratio of the second assembly section inner sidewall bottom is most upper
Face inner sidewall radius size difference C >=0.4mm.
2. the method according to claim 1 that large-caliber thin-walled iron-nickel alloy material deformation is reduced in optical fiber inertial navigation,
It is characterized in that, the sequence of the cover board and pedestal welding are as follows: the position of first welded cover plate outer diameter and base into contact, then weld
The position of cover board internal diameter and base into contact.
3. the method according to claim 1 that large-caliber thin-walled iron-nickel alloy material deformation is reduced in optical fiber inertial navigation,
It is characterized in that, the method for the cover board correction deformation are as follows: flattened on platform using weight.
4. the method according to claim 1 that large-caliber thin-walled iron-nickel alloy material deformation is reduced in optical fiber inertial navigation,
It is characterized in that, is first heat-treated before pedestal and cover board welding.
5. the method according to claim 1 that large-caliber thin-walled iron-nickel alloy material deformation is reduced in optical fiber inertial navigation,
It is characterized in that, the temperature of heat treatment is greater than 1100 DEG C.
6. the method according to claim 1 that large-caliber thin-walled iron-nickel alloy material deformation is reduced in optical fiber inertial navigation,
It is characterized in that, processing is fixed in the pedestal domestic demand in the sensitive components.
7. the method according to claim 1 that large-caliber thin-walled iron-nickel alloy material deformation is reduced in optical fiber inertial navigation,
It is characterized in that, the material of the pedestal and the cover board is iron-nickel alloy.
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| CN201611151282.0A CN106525037B (en) | 2016-12-14 | 2016-12-14 | The method of large-caliber thin-walled iron-nickel alloy material deformation is reduced in optical fiber inertial navigation |
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| CN201611151282.0A CN106525037B (en) | 2016-12-14 | 2016-12-14 | The method of large-caliber thin-walled iron-nickel alloy material deformation is reduced in optical fiber inertial navigation |
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| US6462824B1 (en) * | 1999-12-15 | 2002-10-08 | Northrop Grumman Corporation | Snap fit magnetic shields for laser gyroscopes |
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| CN103033179A (en) * | 2012-12-25 | 2013-04-10 | 北京航空航天大学 | Fiber-optic gyroscope sensitive ring skeleton with inner flange |
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| CN103674005B (en) * | 2012-09-07 | 2016-09-14 | 中国航空工业第六一八研究所 | A kind of optical fibre gyro magnetic shielding cover |
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2016
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| DE69725275T2 (en) * | 1996-07-26 | 2004-08-12 | Litton Systems, Inc., Woodland Hills | HIGHLY EFFICIENT MAGNETIC SHIELDING |
| US6462824B1 (en) * | 1999-12-15 | 2002-10-08 | Northrop Grumman Corporation | Snap fit magnetic shields for laser gyroscopes |
| CN103674005B (en) * | 2012-09-07 | 2016-09-14 | 中国航空工业第六一八研究所 | A kind of optical fibre gyro magnetic shielding cover |
| CN103033179A (en) * | 2012-12-25 | 2013-04-10 | 北京航空航天大学 | Fiber-optic gyroscope sensitive ring skeleton with inner flange |
| CN203908554U (en) * | 2014-06-17 | 2014-10-29 | 北京航空航天大学 | Winding tooling for skeletonless coils of fiber-optic gyroscope |
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| CN106525037A (en) | 2017-03-22 |
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