CN109468445A - One kind is based on micro convex point and coating composite rotating coldworking strengthened device and reinforcement process - Google Patents
One kind is based on micro convex point and coating composite rotating coldworking strengthened device and reinforcement process Download PDFInfo
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- CN109468445A CN109468445A CN201811033315.0A CN201811033315A CN109468445A CN 109468445 A CN109468445 A CN 109468445A CN 201811033315 A CN201811033315 A CN 201811033315A CN 109468445 A CN109468445 A CN 109468445A
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- plug
- sleeve
- convex point
- micro convex
- composite rotating
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D7/00—Modifying the physical properties of iron or steel by deformation
- C21D7/02—Modifying the physical properties of iron or steel by deformation by cold working
- C21D7/04—Modifying the physical properties of iron or steel by deformation by cold working of the surface
Abstract
The present invention provides one kind based on micro convex point and coating composite rotating coldworking strengthened device, its sleeve for including plug and being slideably sheathed on plug, the plug includes a tapered cylinder, the outer surface of plug is coated with one layer of first coating, sleeve has outer wall, a spiral through slot is offered on the outer wall, there is close and regular hemisphere jut of arranging on the outer surface of the side wall, the surface of hemisphere jut is coated with one layer of second coating.The present invention also provides one kind based on micro convex point and coating composite rotating extrusion hardening.Of the invention to use plug and matched conical through-hole including a tapered cylinder based on micro convex point and coating composite rotating coldworking strengthened device, when being conducive to the centering of sleeve and plug, while making radial compression of the plug along hole, stress distribution is more evenly；The sleeve surface of device is provided with spiral through slot to be kept stress distribution more uniform, is on the other hand conducive to the progress of rotating technics when on the one hand squeezing.
Description
Technical field
The present invention relates to material reinforcement fields, and in particular to one kind is filled based on micro convex point and coating composite rotating coldworking strengthened
It sets and reinforcement process.
The prior art
Bolt connecting hole is typical stress concentration portion position on aircraft component, is easily generated under the action of alternating load tired
Labor crackle all substantially reduces so as to cause the safety of complete machine, reliability and service life.Therefore, in design, selection and manufacture
In, how to reduce the influence of fastener hole stress concentration as far as possible, improve the anti-fatigue performance of aircaft configuration, prolong the service life,
The reliability and safety for ensuring aircaft configuration are design and the important subject of investigation of materials person.
H.R. hertz of earliest elasticity for having studied glass lens and occurring under the power effect for making them contact with each other in 1881
Deformation.He assumes: 1. small deformation occurs for contact zone.2. contact surface is oval.3. the object being in contact is regarded as elasticity
Half space only acts on the pressure at right angle being distributed on contact surface.It is all to meet contact assumed above and be known as Hertz contact.Work as contact
Profiling object surface near face is approximately secondary paraboloid, and contact surface size is more than the relative curvature of dimension of object and surface
It is radius hour, available with the result being actually consistent by Hertz theory.In Hertz Contact Problem, due to the change near contact zone
Shape is by the strong constraint of surrounding medium, thus each point is in three-dimensional stress state, and the distribution of contact stress is in high locality,
Decay rapidly with the increase with a distance from contact surface.In addition, contact stress and impressed pressure are in non-linear relation, and with material
Elasticity modulus is related with Poisson's ratio.
In engineering practice, surface Hardening Treatment usually is carried out to fastener hole to improve the service life of aircraft.Reinforcement technique
(fatigue life enhancement methods, FLEM) is the abbreviation for enhancing the measure in aircraft fatigue service life, it refers to
Do not changing structure type, material, under the premise of not increasing construction weight, by the strong of structure significant points and key position
Change process, and achievees the purpose that [Qian Xiaoming, Jiang Yinfang, Guan Haibing wait aircraft structure tight to raising structure fatigue life
Solid hole reinforcement technique summarizes [J] mechanical strength, 2011,33 (5): 749-753].Nowadays, fastener hole reinforcement technique mainly has cold
Extruding, interference engagement, rolling, mechanic shot peening and laser impact intensified.
Hole, which is squeezed, strengthens means as the connecting hole being most widely used in the world at present, in the good situation of technology controlling and process
Under, can be improved 3 times of fastener hole fatigue life or more [Wang Yanli, Zhu Youli, Cao Qiang, wait cold holes expansion Research progress and
Look forward to [J] aviation journal, 2017], principle be by a diameter be greater than aperture, hardness be higher than connection Porous materials plug or
Ball squeezes through connecting hole, forces pore wall material that elastic-plastic deformation occurs, and introduces the big controllable residual pressure of depth amplitude in hole wall and answers
Power layer improves hole edge local stress distribution of the pore structure under external load function, greatly improves connecting hole fatigue strength.
Current most popular hole extrusion process includes that slotted liner bushing squeezes and crack plug extruding.
Wherein, after slotted liner bushing extrusion process is to internal surface of hole processing, the thickness direction along plate can generate biggish stress
Gradient has large effect to the fatigue life of inner hole, in addition, having straight trough on slotted liner bushing, which can be in internal surface of hole
Convex ridge is generated, stress is generated at convex ridge and concentrates, cause the germinating and extension of micro-crack, therefore, after carrying out hole extrusion process, also
Secondary operation is needed, i.e., is reamed to inner hole, to eliminate the influence of convex ridge, the discontinuity of two procedures reduces processing efficiency.
After plug extrusion process crack to internal surface of hole processing, " cross " convex ridge can be also left in inner hole wall, at convex ridge
Stress concentration is not enough to reach microcrack initiation stress, but surface smoothness to inner hole wall and installation accuracy have biggish shadow
It rings, in order to guarantee preferable surface smoothness and installation accuracy, secondary operation is needed to carry out fraising technique, eliminate convex ridge, cause
The discontinuity of technique, meanwhile, the discontinuity of technique will also bring the deviation of precision in process, and then influence hole
Circularity [Rodman G A, Creager M.Split mandrel versus split sleeve coldworking:Dual
methods for extending the fatigue life of metal structures[C]//Advanced
Structural Integrity Methods for Airframe Durability and Damage Tolerance,
Part 2.Advanced Structural Integrity Methods for Airframe Durability and
Damage Tolerance,Part 2,1994].In addition, in use, since plug inner surface and guide shaft outer surface are straight
Contact, easily causes abrasion.
Therefore, at present used in hole extrusion process such as slotted liner bushing squeeze and crack plug extrusion process can in hole table
Face generates protrusion or leads to the germinating of micro-crack, therefore also needs to ream after carrying out extrusion process, to guarantee internal surface of hole
Finish.Meanwhile after both techniques process internal surface of hole, residual compressive stress gradient can be generated along hole thickness direction, into
And influence the fatigue life of inner hole.
In order to overcome these influences, Munich, Germany EADS Creative Lab has invented " variable compression tool " [Reese E
D,Dowson A L,Jones T G B.The Variable Expansion Process,a New Cost Efficient
Method for Cold Working Fastener Holes in Aluminium Aircraft Structures[M]//
ICAF 2009,Bridging the Gap between Theory and Operational Practice.Springer
Netherlands, 2009:1275-1284], " variable compression tool " consists of two parts, and a part is square cone plug, separately
A part is the bushing matched with inner hole with conic mandrel bar, which is made of 4 fan-shaped piecemeals that circle central axis is overlapped.With
Traditional hole extrusion process is compared, which be radially expanded bushing, to reach hole by carrying out axial feed to plug
The effect of coldworking strengthened, the residual stress distribution which processes in metapore is more uniform, still, between 4 fan-shaped piecemeals
Straight trough still can form a plurality of convex ridge in internal surface of hole after making processing, although the stress at convex ridge concentrates level to be far below crackle
Stress level needed for germinating state, but the finish of internal surface of hole can be impacted.And bushing is by piecemeal sector bushing
Composition easily causes bias after certain abrasion, influences the circularity in hole.In addition, being be easy to cause when opposite sliding occurs for plug and sleeve
The abrasion of plug and sleeve interior surface.
Summary of the invention
It is a kind of based on micro convex point and coating composite rotating coldworking strengthened device and reinforcing work it is an object of the invention to propose
Skill improves processing efficiency, while reducing between plug and sleeve interior surface to improve the anti-fatigue performance in the hole of element with holes
Abrasion.
To achieve the goals above, the present invention provides one kind and is based on micro convex point and coating composite rotating coldworking strengthened device,
Its sleeve for including plug and being slideably sheathed on plug, the plug include a tapered cylinder, the appearance of plug
Face is coated with one layer of first coating, and sleeve has outer wall, offers a spiral through slot on the outer wall, on the outer surface of the side wall
With close and regular hemisphere jut of arranging, the surface of hemisphere jut is coated with one layer of second coating.
The first coating is molybdenum disulfide or polytetrafluoroethylene (PTFE)；And the second coating is DLC film, eka-gold
Hard rock film, titanium nitride or titanium carbonitride.
The hemisphere jut is prepared using laser roughening technique.
The inside of the sleeve has a conical through-hole, and taper is consistent with the taper of the tapered cylinder of plug.
The taper of the tapered cylinder and the conical through-hole is 1:30-1:80.
The conical through-hole is processed using slow silk thread cutting technique.
The material of the sleeve is 45 steel or 40cr.
It is arranged on the plug and the sleeve is affixed each other and cylinder body, the one end of cylinder body far from the sleeve and electricity
Machine and pipe-line system connection.
One end of sleeve has a fixing lug boss, and one end of cylinder body has a heavy platform, and the fixing lug boss seat is in described heavy
It is fixed in platform and by an attachment device and washer in the heavy platform, and the outer wall of attachment device and cylinder body is using bolt
Fastening.
On the other hand, the present invention also provides one kind based on micro convex point and coating composite rotating extrusion hardening, feature
It is, comprising: step S1: provides one according to described above based on micro convex point and coating composite rotating coldworking strengthened device, incite somebody to action
One end of its cylinder body is connect to form a hydraulic power unit with a motor and pipe-line system, and an element with holes is fixed on one
On lathe；Step S2: the sleeve based on micro convex point and coating composite rotating coldworking strengthened device is inserted into the member with holes
The hole of part and fixation；Step S3: the hydraulic power unit applies pressure to plug, drives plug along axial feed；Step S4:
Motor in the hydraulic power unit drives cylinder body to be pivoted, and the rotation of cylinder body is with the rotation of moving sleeve；Step S5: plug
The hole is exited with sleeve.
Of the invention uses the core including a tapered cylinder based on micro convex point and coating composite rotating coldworking strengthened device
Stick and matched conical through-hole, are conducive to the centering of sleeve and plug, while when making radial compression of the plug along hole,
Stress distribution is more evenly；The sleeve surface of device is provided with spiral through slot keeps stress distribution more uniform, separately when on the one hand squeezing
On the one hand be conducive to the progress of rotating technics；In addition, sleeve surface laser machines out hemisphere jut, after extrusion process, into
Internal surface of hole can be further processed in row rotary converting process, hemisphere jut, do not need to ream again, improve the continuous of processing
Property and processing efficiency；The device coats one layer of coating on the surface of the hemisphere jut of sleeve, can prevent in process
Hemisphere jut abrasion, meanwhile, to mandrel surface also using being coated with one layer of profit coating, avoid plug during axial feed with set
Cylinder inner wall contacts and generates abrasion.
Of the invention includes following two step in processing based on micro convex point and coating composite rotating extrusion hardening:
Conic mandrel bar is radially expanded along axial feed, sleeve, the inner surface of extruded hole, generates residual compressive stress；And sleeve together with
Plug is pivoted, and the hemisphere jut of sleeve surface processes internal surface of hole, improves internal surface of hole finish, since rotation generates
Amount of heat makes near surface material in hole recrystallize and refine crystal grain, and then the fatigue resistance of lifting hole inner wall, this twice is strong
Chemical industry skill is conducive to improve pore structure fatigue life, and continuity is high, and on the one hand avoiding causes because of the discontinuity of processing
Mismachining tolerance, ensure that the precision in process, on the other hand improve processing efficiency, so that easy to operate, user
Just.
Detailed description of the invention
Fig. 1 is according to an embodiment of the invention total based on micro convex point and coating composite rotating coldworking strengthened device
Body structural schematic diagram；
Fig. 2 is the structural representation as shown in Figure 1 based on micro convex point Yu the sleeve of coating composite rotating coldworking strengthened device
Figure；
Fig. 3 is the partial enlarged view of Fig. 2；
Fig. 4 is the stream according to an embodiment of the invention based on micro convex point Yu coating composite rotating extrusion hardening
Cheng Tu.
Specific embodiment
With reference to the accompanying drawing, presently preferred embodiments of the present invention is provided, and is described in detail, makes to be better understood when this hair
Bright function, feature.
Embodiment 1 is based on micro convex point and coating composite rotating coldworking strengthened device and preparation method thereof
It is as shown in Figure 1 being filled based on micro convex point and coating composite rotating coldworking strengthened according to one embodiment of the present of invention
It sets comprising one end of plug 1 and the sleeve 2 being slideably sheathed on plug 1, sleeve 2 has a fixing lug boss 21.This
Outside, also it is arranged with cylinder body 3 on plug 1, one end of cylinder body 3 has a heavy platform 31, and the fixing lug boss 21 is in heavy platform 31 and leading to
It crosses an attachment device 4 and washer 6 is fixed there are four open up in heavy platform 31, and on the outer wall of attachment device 4 and cylinder body 3
Equally distributed threaded hole, and use bolt fastening.It is achieved in the affixed each other of sleeve 2 and cylinder body 3.The cylinder body 3 it is another
End is connect with a motor 7 and pipe-line system (not shown), so that cylinder body 3 is by the motor 7 driving, it is rotated, while in cylinder body 3
It can be filled with hydraulic oil.
Plug 1 includes a tapered cylinder, and the taper of the tapered cylinder is 1:50, and the peripheral wall of tapered cylinder is equipped with
The flange 11 extended radially outward, and sealing element 5 is equipped between flange 11 and the cylinder body 3.As a result, the piston 11 of plug 1,
A hydraulic power unit is collectively formed in cylinder body 3 and pipe-line system described above, and the hydraulic oil of pipe-line system pushes living in cylinder body 3
Plug 11 simultaneously correspondingly drives plug 1 to move.Wherein, the quantity of piston 11 is two, and in whole plug, one of piston 11 is arrived
This section of front end be it is tapered, this section does not have a taper between two pistons 11, is guaranteeing that it is same that plug 1 is centered about in this way
When, it is ensured that hydraulic oil seal does not generate leakage and plug is pushed to move.In addition, the outer surface of plug 1, which coats one layer, to be had
The first coating (not shown) of lubricating action generates mill for avoiding plug from contacting during axial feed with sleeve lining
Damage.First coating is preferably molybdenum disulfide or polytetrafluoroethylene (PTFE).
As shown in Fig. 2, sleeve 2 is a hollow cylinder, and it is internal to have a taper for the conical through-hole 22 of 1:50, with core
The cooperation of stick 1 is used as its sliding channel；The conical through-hole 22 is processed using slow silk thread cutting technique, so that conical through-hole 22 and plug
1 positioning accuracy is high, when cooperation, is easy centering, repeatedly will not influence its positioning accuracy when disassembly so that plug 1 it is axial into
To when, avoid damaging cutter inner surface because of bias.Sleeve 2 also has outer wall 23, offers one on outer wall 23
Spiral through slot 231, on the one hand, spiral through slot 231 compared with the straight trough in slotted liner bushing in the prior art, to internal orifice dimension to squeeze
After pressure, residual stress is circumferentially distributed more evenly, and through-thickness stress gradient is smaller, so that turbine disk connecting hole fatigue life
It improves a lot, on the other hand, spiral through slot 231 is more advantageous to rotation when rotation processing, ensure that the continuity of processing, mentions
While high processing efficiency, machining accuracy is also ensured.
As shown in figure 3, there is close and regular hemisphere jut 232 of arranging, for squeezing in hole on the outer surface of outer wall 23
Device to hole inner wall squeezes during pressure, which is prepared using laser roughening technique, so that hemisphere jut 232 is passing through
After laser processing, hardness is greatly improved compared with outer wall 23.Sleeve outer surface laser processing is formed by hemisphere jut
232 form Hertz contact with processed hole inner wall in extrusion process, since pervious hole fashion of extrusion did not used
Hertz contact produces so on the one hand Hertz contact of the present invention realizes uniform reinforcing around bolt connecting hole
The raw residual compressive stress being uniformly distributed circumferentially, on the other hand after Hertz contact by the way of, be also beneficial to second operation work
In rotation processing.In addition, the surface of hemisphere jut 232 is coated with one layer of scleroid second coating (not shown), second is applied
On the one hand layer prevents hemisphere jut excessive wear in processing, bore area can be further processed in another aspect coating.It is preferred that
Ground, the material of sleeve 2 are 45 steel, which is DLC film, titanium nitride or titanium carbonitride.
According to above based on micro convex point and coating composite rotating coldworking strengthened device, its available production method should
Production method includes:
Firstly, providing a plug raw material, to guarantee that plug and sleeve cooperate, the cone of 1:50 is processed on plug raw material
Degree, obtains plug 1.
Secondly, providing the sleeve raw materials not punched, sleeve raw materials one end is machined with a fixing lug boss 21, in sleeve original
The inside of material goes out the conical through-hole 22 of taper 1:50 using slow silk thread cutting processing, then processes spiral through slot on its external wall
231, and the hemisphere jut 232 close and regular using the preparation arrangement of laser roughening technique in the outer surface of outer wall, obtain sleeve
2。
Then, a cylinder body 3 is provided, which is machined with a heavy platform 31, and cylinder body 3 and sleeve 2 are sheathed on plug
On 1, the inner wall of plug 1 and sleeve 2 is made to form taper fit, another fixing lug boss 21 is in heavy platform 31, then using a connection dress
Set 4 and washer 6 fixing lug boss 21 is fixed in the heavy platform 31.
Embodiment 2 is based on micro convex point and coating composite rotating extrusion hardening
According to above based on micro convex point and coating composite rotating coldworking strengthened device, the present invention provides one kind based on micro-
Salient point and coating composite rotating extrusion hardening comprising following steps:
Step S1: one is provided according to described above based on micro convex point and coating composite rotating coldworking strengthened device, by it
One end of cylinder body 3 is connect to form a hydraulic power unit with a motor 7 and pipe-line system, by an element (i.e. turbine with holes
Disk) it is fixed on a lathe.
Step S2: the element with holes will be inserted into based on the sleeve 2 of micro convex point and coating composite rotating coldworking strengthened device
Bolt connecting hole and fixation.
Step S3: the radial compression process of sleeve 2.Hydraulic power unit applies pressure to plug 1, drives plug 1 along axis
To feeding, at this point, plug 1 is as the increase of axial feeding is along diameter since plug 1 is matched with the conical through-hole 22 of sleeve 2
To extruding sleeve interior surface, and then the inner wall for making the outer surface of sleeve 2 squeeze bolt connecting hole covers after feeding certain distance
Cylinder generates a certain amount of plastic deformation to inner hole extruding, i.e., in hole, inner wall generates circumferentially distributed residual compressive stress, improves spiral shell
The anti-fatigue performance of bolt connecting hole.
Step S4: plug 1 and sleeve 2 are fitted close, and the motor in hydraulic power unit drives cylinder body 3 to be pivoted, cylinder
The rotation of body 3 is by the rotation with moving sleeve 2, the 232 device to hole inner wall secondary operation of hemisphere jut for being coated with first coating of sleeve 2,
To meet the machining accuracy and surface smoothness of the inner wall of bolt connecting hole, simultaneously as rotation generates amount of heat, make in hole
Near surface material recrystallizes and refines crystal grain, and then the fatigue resistance of lifting hole inner wall.
Step S5: plug 1 and sleeve 2 exit the bolt connecting hole.
Above-described, only presently preferred embodiments of the present invention, the range being not intended to limit the invention, of the invention is upper
Stating embodiment can also make a variety of changes.For example the taper of tapered cylinder can also be 1:30 or 1:80, the material of sleeve
40cr also can be selected in material, and the hardness of spherical protuberances can be HRC28~HRC60.I.e. all rights applied according to the present invention are wanted
Simple, equivalent changes and modifications made by book and description are sought, the claims of the invention patent are fallen within.
The not detailed description of the present invention is routine techniques content.
Claims (10)
1. one kind is based on micro convex point and coating composite rotating coldworking strengthened device comprising plug (1) and be slideably arranged
In the sleeve (2) on plug (1), which is characterized in that the plug (1) includes a tapered cylinder, and the outer surface of plug (1) applies
There is one layer of first coating, sleeve (2) has outer wall (23), offers a spiral through slot (231), the side on the outer wall (23)
There is close and regular hemisphere jut (232) of arranging, the surface of hemisphere jut (232) is coated with one layer on the outer surface of wall (23)
Second coating.
2. according to claim 1 be based on micro convex point and coating composite rotating coldworking strengthened device, which is characterized in that described
First coating is molybdenum disulfide or polytetrafluoroethylene (PTFE)；And the second coating is DLC film, DLC film, nitridation
Titanium or titanium carbonitride.
3. according to claim 1 be based on micro convex point and coating composite rotating coldworking strengthened device, which is characterized in that described
Hemisphere jut (232) is prepared using laser roughening technique.
4. according to claim 1 be based on micro convex point and coating composite rotating coldworking strengthened device, which is characterized in that described
The inside of sleeve (2) has a conical through-hole (22), and taper is consistent with the taper of tapered cylinder of plug (1).
5. according to claim 4 be based on micro convex point and coating composite rotating coldworking strengthened device, which is characterized in that described
The taper of tapered cylinder and the conical through-hole (22) is 1:30-1:80.
6. according to claim 5 be based on micro convex point and coating composite rotating coldworking strengthened device, which is characterized in that described
Conical through-hole (22) is processed using slow silk thread cutting technique.
7. according to claim 1 be based on micro convex point and coating composite rotating coldworking strengthened device, which is characterized in that described
The material of sleeve (2) is 45 steel or 40cr.
8. according to claim 1 based on micro convex point and coating composite rotating coldworking strengthened device described in one of -7, feature exists
In being arranged on the plug (1) and the sleeve (2) is affixed each other and cylinder body (3), cylinder body (3) is far from the sleeve (2)
One end connect with a motor (7) and pipe-line system.
9. according to claim 8 be based on micro convex point and coating composite rotating coldworking strengthened device, which is characterized in that sleeve
(2) one end has a fixing lug boss (21), and one end of cylinder body (3) has a heavy platform (31), fixing lug boss (21) seat in
It is fixed in the heavy platform (31) and by an attachment device (4) and washer (6) on the heavy platform (31), and attachment device
(4) bolt fastening is used with the outer wall of cylinder body (3).
10. one kind is based on micro convex point and coating composite rotating extrusion hardening characterized by comprising
Step S1: it provides one and is filled according to one of claim 8-9 based on micro convex point and coating composite rotating coldworking strengthened
It sets, one end of its cylinder body (3) is connect with a motor (7) and pipe-line system to form a hydraulic power unit, it is with holes by one
Element is fixed on a lathe；
Step S2: the sleeve (2) based on micro convex point and coating composite rotating coldworking strengthened device is inserted into the member with holes
The hole of part and fixation；
Step S3: the hydraulic power unit applies pressure to plug (1), drives plug (1) along axial feed；
Step S4: the motor in the hydraulic power unit drives cylinder body (3) to be pivoted, the rotation band moving sleeve of cylinder body (3)
(2) rotation；
Step S5: plug (1) and sleeve (2) exit the hole.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811033315.0A CN109468445B (en) | 2018-09-05 | 2018-09-05 | Composite rotary extrusion strengthening device and strengthening process based on micro-convex points and coating |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811033315.0A CN109468445B (en) | 2018-09-05 | 2018-09-05 | Composite rotary extrusion strengthening device and strengthening process based on micro-convex points and coating |
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| CN111961823A (en) * | 2020-08-19 | 2020-11-20 | 江苏大学 | Spiral slotted sleeve with concave-convex phase micro-texture and hole extrusion strengthening method |
| CN112045677A (en) * | 2020-08-10 | 2020-12-08 | 华东理工大学 | Intelligent strengthening system for bolt holes of turbine disc of aircraft engine and control method of intelligent strengthening system |
| CN113977190A (en) * | 2021-11-23 | 2022-01-28 | 南京航空航天大学 | Ultrasonic vibration auxiliary hole extrusion strengthening device, design method and operation process thereof |
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|---|---|---|---|---|
| CN112045677A (en) * | 2020-08-10 | 2020-12-08 | 华东理工大学 | Intelligent strengthening system for bolt holes of turbine disc of aircraft engine and control method of intelligent strengthening system |
| CN112045677B (en) * | 2020-08-10 | 2024-03-29 | 华东理工大学 | Intelligent reinforcement system for bolt holes of turbine disk of aero-engine and control method of intelligent reinforcement system |
| CN111961823A (en) * | 2020-08-19 | 2020-11-20 | 江苏大学 | Spiral slotted sleeve with concave-convex phase micro-texture and hole extrusion strengthening method |
| CN113977190A (en) * | 2021-11-23 | 2022-01-28 | 南京航空航天大学 | Ultrasonic vibration auxiliary hole extrusion strengthening device, design method and operation process thereof |
| CN113977190B (en) * | 2021-11-23 | 2022-10-25 | 南京航空航天大学 | Ultrasonic vibration auxiliary hole extrusion strengthening device, design method and operation process thereof |
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| CN109468445B (en) | 2020-11-10 |
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