CN105861798A - Hole-expanding compound reinforcing method for corrosion holes - Google Patents
Hole-expanding compound reinforcing method for corrosion holes Download PDFInfo
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- CN105861798A CN105861798A CN201610291134.2A CN201610291134A CN105861798A CN 105861798 A CN105861798 A CN 105861798A CN 201610291134 A CN201610291134 A CN 201610291134A CN 105861798 A CN105861798 A CN 105861798A
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- Prior art keywords
- hole
- reaming
- cold extrusion
- polishing
- hole wall
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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
- C21D7/10—Modifying the physical properties of iron or steel by deformation by cold working of the whole cross-section, e.g. of concrete reinforcing bars
- C21D7/12—Modifying the physical properties of iron or steel by deformation by cold working of the whole cross-section, e.g. of concrete reinforcing bars by expanding tubular bodies
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Crystallography & Structural Chemistry (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
Abstract
The invention relates to the field of surface damage repairing and reinforcing, in particular to a hole-expanding compound reinforcing method for corrosion holes. The hole-expanding compound reinforcing method comprises the following steps: polishing hole walls of processed holes so as to remove corrosion products; and reducing the roughness of the hole walls, and carrying out hole wall reinforcing treatment by adopting a method of cold-extruding and hole-expanding. According to the hole-expanding compound reinforcing method for the corrosion holes provided by the invention, reinforcing treatment is carried out on the surfaces of the processed holes by virtue of cold-extruding and hole-expanding, so that the method is beneficial for recovering fatigue strength of prior-corroded holes; and parts are not needed to be replaced, so that the process is simple, the cost is low and the materials are saved, and therefore, the hole-expanding compound reinforcing method is especially suitable for prolonging the service life of aged mechanical equipment.
Description
Technical field
The present invention relates to hole surface injury repairing and strengthening field, in particular to a kind of etch pit
Reaming composite strengthening method.
Background technology
Each pores in structure is corrosion and tired weak part, aircaft configuration, Ship Steel structure,
Large-scale steel structure, drilling platforms, steel bridge, transport facility and beam-and-rail steel construction, particularly in sea
The fatigue strength of above-mentioned steel (aluminum) the structure erosion metapore being on active service in ocean air or coastal area declines to a great extent,
The corrosion of hole wall not only results in fatigue and occurs to early, and Threshold Value of Fatigue can be made to reduce.
For solving the etching problem of pore structure, existing maintenance or repairing measure have:
1, ream processes: corrosion layer is removed in fraising.
2, change part to repair: shell renewal in large area or more renew parts.
But, traditional handicraft is respectively arranged with weak point:
1, fraising: remove material, reduces structural static strength, and repeatedly ream can cause structure to scrap.Fly
Machine important force-bearing hole structure only allows a ream.
2, changing part to repair: cost is high, workload is big, wastes material.
Summary of the invention
It is an object of the invention to provide the reaming composite strengthening method of etch pit, to solve prior art
Present in technical problem.
Provide the reaming composite strengthening method of a kind of etch pit in an embodiment of the present invention, the most first lead to
Cross the hole wall to described processed hole to be polished, be used for removing corrosion product, reduce hole wall thick simultaneously
Rugosity, uses the method for cold extrusion reaming to carry out hole wall intensive treatment afterwards.
Further, the mode being polished described processed hole rotates polishing or ultrasonic throwing for machinery
Light.
Further, after polishing, the roughness of hole wall surface is less than Ra 3.2.
Further, the method for the method of cold extrusion reaming is:
Active section diameter is more than the cold extrusion plug in the aperture in processed hole, at the uniform velocity drawing or pushing
By processed hole, make hole wall produce plastically deforming area, after unloading, produce residual compressive stress and strengthening layer.
Further, in polishing process, before changing abrasive material or grinding agent, to tool heads and institute every time
The hole wall stating processed hole is carried out.
Further, after polishing, carry out follow-up cold extrusion intensive treatment immediately, or at hole wall protection by spraying aqueous preventives
Coating.
Further, described cold extrusion plug, before entering into described processed hole, need to carry out surface
Lubrication.
Further, the lubricant being lubricated described cold extrusion plug is fixing lubricant.
Further, described cold extrusion plug is when by described processed hole, does not pauses in centre.
Further, the flange that cold extrusion reaming is formed at extruding end, by the work of mechanical or manual polishing
Skill processes.
The reaming composite strengthening method of the etch pit that the present invention provides, by cold extrusion reaming, is being located
The surface in reason hole carries out intensive treatment, contributes to significantly recovering pre-etching hole fatigue strength；
Being made without the replacing of part, technique is simple, low cost, saving material, is particularly suitable for extending
The service life of aged mechanized equipment.
Accompanying drawing explanation
In order to be illustrated more clearly that the specific embodiment of the invention or technical scheme of the prior art, under
The accompanying drawing used required in detailed description of the invention or description of the prior art will be briefly described by face,
It should be evident that the accompanying drawing in describing below is some embodiments of the present invention, general for this area
From the point of view of logical technical staff, on the premise of not paying creative work, it is also possible to obtain according to these accompanying drawings
Obtain other accompanying drawing.
Fig. 1 is that the machinery of the reaming composite strengthening method of etch pit of the present invention rotates the signal of pre-polish(ing) technique
Figure；
Fig. 2 is the ultrasonic pre-polish(ing) process schematic representation of the reaming composite strengthening method of etch pit of the present invention；
Fig. 3 is the follow-up cold extrusion chambering process signal of the reaming composite strengthening method of etch pit of the present invention
Figure；
Fig. 4 is the process chart of the reaming composite strengthening method of etch pit of the present invention.
Reference:
1: processed part 2: tool heads 3: rotary polisher
4: processed hole 5: horn 6: ultrasonic polishing machine
7: cold extrusion plug 8: plastically deforming area
Detailed description of the invention
Below in conjunction with accompanying drawing, technical scheme is clearly and completely described, it is clear that
Described embodiment is a part of embodiment of the present invention rather than whole embodiments.Based on this
Embodiment in bright, those of ordinary skill in the art are obtained under not making creative work premise
Every other embodiment, broadly fall into the scope of protection of the invention.
In describing the invention, it should be noted that term " " center ", " on ", D score, " left ",
The orientation of the instruction such as " right ", " vertically ", " level ", " interior ", " outward " or position relationship are for based on accompanying drawing institute
The orientation shown or position relationship, be for only for ease of the description present invention and simplify description rather than instruction
Hint indication device or element must have specific orientation, with specific azimuth configuration and operation,
Therefore it is not considered as limiting the invention.
Additionally, term " first ", " second ", " the 3rd " are only used for describing purpose, and it is not intended that refer to
Show or imply relative importance.
In describing the invention, it should be noted that unless otherwise clearly defined and limited, art
Language " is installed ", " being connected ", " connection " should be interpreted broadly, and connects for example, it may be fixing, it is also possible to
It is to removably connect, or is integrally connected；Can be to be mechanically connected, it is also possible to be electrical connection；Permissible
It is to be joined directly together, it is also possible to be indirectly connected to by intermediary, can be the connection of two element internals.
For the ordinary skill in the art, above-mentioned term can be understood in the present invention with concrete condition
Concrete meaning.
The present invention be directed to the deficiency that conventional holes structural repair mode exists, the corrosion of apertures wall surface carries
A kind of pre-polish(ing) and cold extrusion reaming compound hardening treatment technique are supplied.
Its know-why is: by being polished removing corrosion product to corrosion hole wall, reduce simultaneously
Hole Wall Roughness, uses the method for cold extrusion reaming to carry out hole wall intensive treatment afterwards.
The present invention is accomplished by:
1, pre-polish(ing) processes: pre-polish(ing) process can use rotary polisher 3 or ultrasonic polishing machine 6 (but
It is not limited to both polishing technologies), polishing tool head 2 is mechanically connected to rotary polisher output revolving shaft,
Or the end of the horn 5 of ultrasonic polishing machine.Pre-polish(ing) tool heads 2 is placed on processed part 1
The hole wall surface in processed hole 4 is removed corrosion product polishing and processes.Polishing time is according to hole wall
Surface corrosion situation determines, every time general 1～5min, pre-polish(ing) process after hole wall surface coarse
Degree should be less than Ra 3.2.
According to pore wall material, Hole Wall Roughness and with polishing after roughness requirements, use successively
Suitably abrasive material and the grinding agent of suitable granularity, be processed by shot blasting etch pit, polishing time about per pass
Secondary 1～5min, before changing abrasive material and grinding agent, it is necessary to spend with the cotton textiles of 100% glue take ethanol or other
Cleaning solution cleaning means head and hole wall surface, finally make hole wall surface roughness reach Ra≤0.8 μm.Make
The radian of hole wall disc can be coordinated with cork rod or bamboo rod.
2, cold extrusion reaming intensive treatment: after pre-polish(ing), throws active section diameter D slightly larger than through pre-
Cold extrusion plug 7 at the uniform velocity drawing under conditions of sufficient lubrication of the processed hole aperture d0 after optical processing
Or it is forced through the hole processed through pre-polish(ing), makes pore wall material produce plastically deforming area 8, produce after unloading
Raw residual compressive stress and strengthening layer.
After pre-polish(ing), within the shortest time, carry out follow-up cold extrusion intensive treatment, otherwise need
In hole wall protection by spraying aqueous preventives coating after pre-polish(ing) processes, in order to avoid hole wall corrosion or oxidation.
During cold extrusion reaming, active section diameter is slightly larger than the plug of pre-polish(ing) back aperture in sufficient lubrication
Under conditions of be at the uniform velocity pressed through through the hole that pre-polish(ing) processes that (extrusion speed is typically left at 20mm/min.
The right side, not in stopping over), make pore wall material produce residual compressive stress and strengthening layer.Lubricant one
As select the kollag of good pressure-resistant performance, such as the graphite being in harmonious proportion through lubricating oil, or adjust through lubricating oil
The molybdenum bisuphide of sum, it is possible to use oil lubricant, such as animal oil, vegetable oil and mineral oil.
The amount of compression of cold extrusion reaming should determine according to processed material and strengthening requirement, the most high-strength
Steel is between 2.4%～3%, and high strength alumin ium alloy is between 1.2～4.8%.Noting, amount of compression is unsuitable excessive,
In order to avoid making hole wall surface produce damage.
3, cold extrusion reaming typically can form flange at extruding end, in order to avoid having influence on follow-up bolt
Or riveting assembling, mechanical or manual technique for grinding should be used to be processed by flange, it should be noted that can not during polishing
Injure hole wall surface.
As shown in accompanying drawing 1 to Fig. 4, the invention provides the reaming composite strengthening method of a kind of etch pit,
I.e. first pass through the hole wall to described processed hole 4 to be polished, be used for removing corrosion product, subtract simultaneously
Little Hole Wall Roughness, uses the method for cold extrusion reaming to carry out hole wall intensive treatment afterwards.
Cold extrusion plug 7 includes active section, linkage section and guide section.The two ends of active section respectively connect
The section of connecing and guide section, cold extrusion plug 7 is connected by linkage section with extruding power set such as motor etc.
Getting up, to the power of cold extrusion plug 7 one extruding, guide section enters into processed hole 4 at active section
It is introduced in processed hole 4, it is possible to avoid active section cannot align with processed hole 4 before
Align.
The structures such as the setting of guide section, generally round platform, or it is set to lead, in lead and work
Chamfering is set between the section of work, in order to active section enters in processed hole 4.
The diameter of the active section of cold extrusion plug 7 is slightly larger than the aperture in processed hole 4, dynamic by extruding
Power apparatus drives cold extrusion plug 7 to enter in processed hole 4, carries out the hole wall in processed hole 4
Extruding, and then make hole wall produce plastic deformation district, and then at cold extrusion plug 7 from processed hole 4
After extraction, the hole wall in processed hole 4 produces residual compressive stress and strengthening layer, and then improves processed hole 4
Fatigue strength.
Yes it may be noted that, when cold extrusion plug 7 carries out drawing in processed hole 4 or pushes, need
Ensure at the uniform velocity, it is to avoid irregular due to speed and that cause plastic deformation is uneven, so cold extracting out
Strengthening layer after extruding plug 7 is uneven.
Before processed part 1 proceeds by process, the hole wall in processed hole 4 has more corrosion
Product.Before carrying out the strengthening in processed hole 4, first processed hole 4 is polished, it is possible to will
Corrosion product on the hole wall in processed hole 4 is removed, and then when processed hole 4 is carried out cold extrusion,
Corrosion product will not be squeezed in hole wall, and then the fatigue that can improve the hole wall in processed hole 4 is strong
Degree.
Further, processed hole 4 is polished, it is also possible to improve the hole wall fineness in processed hole 4,
Reduce roughness, and then reduction cold extrusion plug 7 enters into the difficulty in processed hole 4, and can subtract
Friction between active section surface and the hole wall in processed hole 4 of few cold extrusion plug 7, and then improve
The life-span of cold extrusion plug 7.
It is preferred embodiment that the mode being polished described processed hole 4 rotates for machinery throws
Light or ultrasonic polishing.
The polishing mode in processed hole 4 is had a variety of.In the present embodiment, have employed machinery rotation
Polishing and ultrasonic polishing mode.
It is to use rotary polisher 3 to drive tool heads 2 to rotate, by tool heads 2 that machinery rotates polishing
Processed hole 4 is polished.Tool heads 2 is mechanically connected on the output revolving shaft of rotary polisher 3,
When rotary polisher 3 rotates, tool heads 2 is driven to rotate, by the work of tool heads 2
As surface, the hole wall in processed hole 4 is carried out sanding and polishing.
Ultrasonic polishing is that ultrasonic polishing machine 6 drives tool heads 2 to vibrate, by tool heads 2 to quilt
Disposal hole 4 is polished.Ultrasonic polishing machine 6 mainly has supersonic generator to send ultrasound wave, warp
Cross transducer and ultrasound wave is converted to mechanical vibration, further after the amplification of horn 5, band
Power driven tools head 2 vibrates, and then comes the hole to processed hole 4 by the working surface of tool heads 2
Wall carries out sanding and polishing.
The polishing mode to processed hole 4 that it is pointed out that can be that machinery rotates polishing or ultrasonic
Polishing, but it is not limited solely to above two mode, and it can also is that other polishing mode, also
That is, as long as it is capable of being polished the hole wall in processed hole 4.
It is preferred embodiment that after polishing, the roughness of hole wall surface is less than Ra 3.2.
Processed hole 4 after polishing, the surface roughness of its hole wall should be reduced to one relatively low
Numerical value, to ensure all to remove complete by the corrosion product of hole wall surface.
After test of many times research, the surface roughness of the hole wall after polishing is set by the present embodiment
It is set to less than Ra 3.2, ensures the clean of corrosion product, and then ensure the fatigue strength in processed hole 4
Recovery.
It is preferred embodiment that the method for the method of cold extrusion reaming is:
By active section diameter more than the cold extrusion plug 7 in the aperture in processed hole 4, at the uniform velocity drawing or push away
Pressure, by processed hole 4, makes hole wall produce plastically deforming area 8, produces residual compressive stress with strong after unloading
Change layer.
It is preferred embodiment, in polishing process, before changing abrasive material or grinding agent, to work every time
The hole wall in tool 2 and described processed hole 4 is carried out.
According to pore wall material, Hole Wall Roughness and with polishing after roughness requirements, use successively
Suitably abrasive material and the grinding agent of suitable granularity, is processed by shot blasting the processed hole 4 of corrosion, polishing
Time be about every time 1～5min, before changing abrasive material and grinding agent, it is necessary to spend to glue with the cotton textiles of 100% and take
Ethanol or other cleaning solution cleaning means head 2 and hole wall surface, finally make hole wall surface roughness reach
Ra≤0.8μm.Use cork rod or bamboo rod can coordinate the radian of hole wall disc.
The hole wall of tool heads 2 and processed hole 4 is carried out, it is possible to reduce hole wall surface roughness,
Reduce the friction between hole wall and tool heads 2, and then the service life of tool heads 2 can be improved.
The mode being carried out the hole wall of tool heads 2 and processed hole 4 can have a lot, as above-mentioned
Use Cotton Gossypii viscous take ethanol, it is also possible to be to use the such as modes such as machine oil, diesel oil even washing, also
That is, as long as the surface in processed hole 4 and tool heads 2 can be carried out totally.
It is preferred embodiment after polishing, to carry out follow-up cold extrusion intensive treatment immediately, or at hole wall
Protection by spraying aqueous preventives coating.
Processed hole 4, after polishing, carries out follow-up cold extrusion strengthening within the shortest time
Process, the most in the short period of time cold extrusion plug 7 is pushed in processed hole 4, otherwise need
In hole wall protection by spraying aqueous preventives coating after pre-polish(ing) processes, in order to avoid hole wall is again corroded or aoxidizes.
Antirust coat can be by using antirust oil, antirust paint or passivating solution etc. to smear, it is also possible to
It is to use corrosion inhibiter etc. to be processed to realize.As long as it is to say, it is it can be avoided that hole wall is by again
Corrode or aoxidize.
Be preferred embodiment, described cold extrusion plug 7 before entering into described processed hole 4,
Surface lubrication need to be carried out.
During cold extrusion reaming, active section diameter is existed slightly larger than the cold extrusion plug 7 of pre-polish(ing) back aperture
At the uniform velocity it is pressed through the processed hole 4 processed through pre-polish(ing) under conditions of sufficient lubrication, makes to produce on hole wall
Residual compressive stress and strengthening layer.
Cold extrusion plug 7 after lubrication enters by being pressed in processed hole 4, it is possible to fall
Friction between low cold extrusion plug 7 and processed hole 4, and then be that cold extrusion plug 7 is easier
Get in processed hole 4, it is achieved the cold extrusion reaming to processed hole 4.
It is preferred embodiment that the lubricant being lubricated described cold extrusion plug 7 is fixing profit
Lubrication prescription.
The kollag of good pressure-resistant performance typically selected by lubricant, such as the graphite being in harmonious proportion through lubricating oil,
Or the molybdenum bisuphide through lubricating oil mediation, it is possible to use oil lubricant, such as animal oil, vegetable oil
And mineral oil.
Be preferred embodiment, described cold extrusion plug 7 when by described processed hole 4, in
Between do not pause.
Extrusion speed is typically at about 20mm/min., not in stopping over.
The amount of compression of cold extrusion reaming should determine according to processed material and strengthening requirement, the most high-strength
Steel is between 2.4%～3%, and high strength alumin ium alloy is between 1.2～4.8%.Noting, amount of compression is unsuitable excessive,
In order to avoid making hole wall surface produce damage.
It is preferred embodiment, the flange that cold extrusion reaming is formed at extruding end, with mechanical or manual
The technique of polishing processes.
Cold extrusion reaming typically can extruding end formed flange, in order to avoid have influence on follow-up bolt or
Riveting assembling, should use mechanical or manual technique for grinding to be removed by flange, it should be noted that can not hinder during polishing
And hole wall surface.
That sums up says, the reaming composite strengthening method of etch pit of the present invention is, is first entered in processed hole 4
Row polishing, during polishing, before changing abrasive material or grinding agent, needs tool heads 2 and quilt
The hole wall of disposal hole 4 is carried out；After a polish, use the cold extrusion plug 7 after surface lubrication right
The hole wall in processed hole 4 carries out cold extrusion reaming；Timely cold extrusion reaming can not be carried out, to being located
The hole wall in reason hole 4 carries out protection by spraying aqueous preventives coating process；Processed hole 4 after cold extrusion reaming produces
Flange carries out mechanical or manual polishing, and whole process chart is as shown in Figure 4.
In summary it can be seen, the present invention is compared with fraising, and pre-polish(ing) material is removed few, does not changes
The nominal diameter in hole, affects the least on the static strength of pore structure, and traditional fraising technique eliminates hole
Wall material, can cause pore structure static strength to decline.
Traditional fraising restorative procedure, does not has follow-up coldworking strengthened to process after fraising, so to pre-corruption
The recovery of pit fatigue strength is limited.
The method of the present invention is compared with changing part repairing, and technique is simple, low cost, saving material, especially
It is suitable for the service life extending aged mechanized equipment.
The reaming composite strengthening method of the etch pit that the present invention provides, by cold extrusion reaming, is being located
The surface in reason hole 4 carries out intensive treatment, contributes to the recovery to pre-etching hole fatigue strength；Need not
Carrying out the replacing of part, technique is simple, low cost, saving material, is particularly suitable for extending aged machine
The service life of tool equipment.
Last it is noted that various embodiments above is only in order to illustrate technical scheme, rather than
It is limited；Although the present invention being described in detail with reference to foregoing embodiments, this area
Those of ordinary skill is it is understood that the technical scheme described in foregoing embodiments still can be entered by it
Row amendment, or the most some or all of technical characteristic is carried out equivalent；And these amendment or
Person replaces, and does not make the essence of appropriate technical solution depart from the scope of various embodiments of the present invention technical scheme.
Claims (10)
1. the reaming composite strengthening method of an etch pit, it is characterised in that first pass through and state processed hole
Hole wall be polished, be used for removing corrosion product, reduce Hole Wall Roughness simultaneously, use cold afterwards
The method of extruding reaming carries out hole wall intensive treatment.
The reaming composite strengthening method of etch pit the most according to claim 1, it is characterised in that
The mode being polished described processed hole rotates polishing or ultrasonic polishing for machinery.
The reaming composite strengthening method of etch pit the most according to claim 1, it is characterised in that
After polishing, the roughness of hole wall surface is less than Ra 3.2.
The reaming composite strengthening method of etch pit the most according to claim 1, it is characterised in that
The method of the method for cold extrusion reaming is:
By active section diameter more than the cold extrusion plug in aperture in described processed hole, at the uniform velocity drawing or
It is forced through described processed hole, makes hole wall produce plastically deforming area, after unloading, produce residual compressive stress
And strengthening layer.
The reaming composite strengthening method of etch pit the most according to claim 1, it is characterised in that
In polishing process, before changing abrasive material or grinding agent, to tool heads and the hole in described processed hole every time
Wall is carried out.
The reaming composite strengthening method of etch pit the most according to claim 1, it is characterised in that
Follow-up cold extrusion intensive treatment is carried out immediately after polishing, or in hole wall protection by spraying aqueous preventives coating.
The reaming composite strengthening method of etch pit the most according to claim 4, it is characterised in that
Described cold extrusion plug, before entering into described processed hole, need to carry out surface lubrication.
The reaming composite strengthening method of etch pit the most according to claim 7, it is characterised in that
The lubricant being lubricated described cold extrusion plug is fixing lubricant.
The reaming composite strengthening method of etch pit the most according to claim 4, it is characterised in that
Described cold extrusion plug is when by described processed hole, does not pauses in centre.
10., according to the reaming composite strengthening method of the etch pit described in any one of claim 1-9, it is special
Levy and be, the flange that cold extrusion reaming is formed at extruding end, carry out by the technique of mechanical or manual polishing
Process.
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| CN201610291134.2A CN105861798B (en) | 2016-05-05 | 2016-05-05 | The reaming composite strengthening method of etch pit |
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| CN201610291134.2A CN105861798B (en) | 2016-05-05 | 2016-05-05 | The reaming composite strengthening method of etch pit |
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| CN107254581A (en) * | 2017-05-04 | 2017-10-17 | 江苏大学 | A kind of laser-impact and ultrasonic vibration extruding cooperative reinforcing device and method |
| CN107254581B (en) * | 2017-05-04 | 2018-10-09 | 江苏大学 | A kind of laser-impact and ultrasonic vibration squeeze cooperative reinforcing device and method |
| WO2018201521A1 (en) * | 2017-05-04 | 2018-11-08 | 江苏大学 | Laser shock and supersonic vibration extrusion co-strengthening device and method |
| US11542571B2 (en) | 2017-05-04 | 2023-01-03 | Jiangsu University | Laser shock and supersonic vibration extrusion co-strengthening device and method |
| CN107804477A (en) * | 2017-08-28 | 2018-03-16 | 中国航空工业集团公司沈阳飞机设计研究所 | A kind of preventive overhaul method in Tensile load bolt hole |
| CN110450062A (en) * | 2018-05-07 | 2019-11-15 | 蓝思科技股份有限公司 | It is a kind of for processing the polishing rod and polishing method of waist-shaped hole |
| CN112172700A (en) * | 2019-07-03 | 2021-01-05 | 全耐塑料欧洲公司 | Element of a body part comprising an aperture covered with a protective coating |
| CN111069983A (en) * | 2019-12-31 | 2020-04-28 | 昆山品越精密模具有限公司 | Polishing method for ball sheath of stamping bearing |
| CN111975283A (en) * | 2020-07-24 | 2020-11-24 | 中国航发北京航空材料研究院 | Cold extrusion method and tool for prolonging cycle life of wheel disc with bolt holes |
| CN111975283B (en) * | 2020-07-24 | 2023-03-14 | 中国航发北京航空材料研究院 | Cold extrusion method and tool for prolonging cycle life of wheel disc with bolt holes |
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