CN105779756A - Hole corner strengthening treatment method - Google Patents
Hole corner strengthening treatment method Download PDFInfo
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- CN105779756A CN105779756A CN201610290905.6A CN201610290905A CN105779756A CN 105779756 A CN105779756 A CN 105779756A CN 201610290905 A CN201610290905 A CN 201610290905A CN 105779756 A CN105779756 A CN 105779756A
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- angle
- spot hole
- impact extrusion
- hole
- horn
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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
- C21D10/00—Modifying the physical properties by methods other than heat treatment or deformation
-
- 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
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/0068—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for particular articles not mentioned below
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Drilling And Boring (AREA)
- Apparatuses For Generation Of Mechanical Vibrations (AREA)
Abstract
The invention relates to the field of hole corner treatment, in particular to a hole corner strengthening treatment method. According to the method, a hole corner ultrasonic impact extrusion strengthening device is adopted to perform ultrasonic frequency impact extrusion treatment on the hole corner edge of a treated hole so that plastic deformation can happen to a material nearby the hole corner. According to the hole corner strengthening treatment method, the hole corner ultrasonic impact extrusion strengthening device is adopted to perform ultrasonic frequency impact extrusion treatment on the hole corner edge of the treated hole so that plastic deformation can happen to the material nearby the hole corner, the material nearby the hole corner can generate a grain refinement effect, residue compressive stress is formed after unloading, and therefore the anti-fatigue performance, the stress corrosion resistant performance and the abrasion resistance of the hole are substantially improved.
Description
Technical field
The present invention relates to angle of spot hole process field, in particular to a kind of angle of spot hole enhanced processing method.
Background technology
In frame for movement and part, usually processing has various connecting hole or fabrication hole (hereinafter referred to as pore structure), it is broadly divided into 3 classes such as connecting hole structure, structure stop hole and structure perforate, the stress of pore structure component Chang Yinkong is concentrated and is caused fatigue rupture, relevant investigation shows, in the fatigue failure of aircraft structure, there are about the fatigue crack of 70% and come from pore structure.Therefore, hole becomes the tired weak link of pore structure component.And the fatigue rupture of pore structure component is often derived from angle of spot hole or hole Bian Chu.
For solving the FATIGUE FRACTURE PROBLEMS of pore structure, the technical measures adopted at present has: the reinforcement process such as the process of ball pressure, aperture end face impressing, cold extrusion reaming.A common feature of several techniques is that the plastic deformation of angle of spot hole material is realized by quasi-static pressure load above.Wherein, ball pressure processes and the produced amount of plastic deformation of aperture end face impressing is relatively low, therefore that the anti-fatigue performance improvement result in hole is limited.
In cold extrusion chambering process, extruding plug is forced through along the axis direction of initial apertures with interference form, makes hole wall produce elastic-plastic deformation and residual compressive stress.The surface smoothness of this technological requirement initial apertures is high, and extrusion process to have sufficient lubrication, otherwise very easily causes hole wall surface to damage, is suitable for the cold holes expansion of the low magnitude of interference.But substantial amounts of research and application show, after cold extrusion expanding treatment, fatigue crack source concentrates germinating at the ingate Angle Position of extruded hole.
Summary of the invention
It is an object of the invention to provide angle of spot hole enhanced processing method, to solve the technical problem existed in prior art.
Angle of spot hole enhanced processing method provided by the invention, adopts angle of spot hole ultrasonic impact extrusion intensifying device that the angle of spot hole edge in processed hole is carried out supersonic frequency impact extrusion process, makes material near angle of spot hole produce plastic deformation.
Further, the ultrasonic impact extrusion intensifying device of described angle of spot hole includes supersonic generator, transducer, horn, tool heads and housing；
Described supersonic generator is arranged on one end of housing；
Described transducer is arranged on the inside of described housing；
One end of described horn connects described housing；
The other end of described horn is provided with described tool heads；
Described tool heads includes lead, impact extrusion portion and connecting portion；
One end of described connecting portion is fixing with the one end in described impact extrusion portion to be connected；
The other end of described connecting portion and described horn removably connect；
Described impact extrusion portion has impact extrusion inclined-plane, it is possible to angle of spot hole is carried out impact extrusion；
Described connecting portion, described impact extrusion portion and described lead are coaxially disposed.
Further, the surface in described impact extrusion portion is provided with lubricant.
Further, described transducer is provided with cooling fan away from one end of described horn.
Further, described horn is arranged in described housing by retainer ring；
Described retainer ring is arranged on described horn one end away from transducer.
Further, described transducer is magnetostrictive transducer or piezoelectric ceramic transducer.
Further, the direction of vibration of described horn is axial vibration.
Further, described transducer and described horn are coaxially disposed.
Further, described housing is additionally provided with handle.
Further, after angle of spot hole carries out vibration impact extrusion, mechanical or manual technique for grinding is adopted to be processed by the flange that angle of spot hole place produces.
Angle of spot hole enhanced processing method provided by the invention, utilize angle of spot hole ultrasonic impact extrusion intensifying device that the angle of spot hole edge in processed hole is carried out supersonic frequency impact extrusion process, material near angle of spot hole is made to produce plastic deformation, material near angle of spot hole is made to produce the effect of grain refinement, residual compressive stress is formed, thus the anti-fatigue performance in hole, anti-stress corrosion performance and wearability are greatly improved after unloading.
Accompanying drawing explanation
In order to be illustrated more clearly that the specific embodiment of the invention or technical scheme of the prior art, the accompanying drawing used required in detailed description of the invention or description of the prior art will be briefly described below, apparently, accompanying drawing in the following describes is some embodiments of the present invention, for those of ordinary skill in the art, under the premise not paying creative work, it is also possible to obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the structural representation of angle of spot hole strengthening and processing device of the present invention；
Fig. 2 is the structural representation of the tool heads of angle of spot hole strengthening and processing device of the present invention；
Fig. 3 is the handling principle schematic diagram of angle of spot hole strengthening and processing device of the present invention.
Accompanying drawing labelling:
1: housing 2: transducer 3: horn
4: stopper section 5: retainer ring 6: tool heads
7: processed part 8: cooling fan 9: handle
10: supersonic generator 11: connecting portion 12: transition part
13: impact extrusion portion 14: lead 15: plastic deformation district
16: processed hole 17: angle of spot hole
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 the embodiment in the present invention, the every other embodiment that those of ordinary skill in the art obtain under not making creative work premise, broadly fall into the scope of protection of the invention.
In describing the invention, it should be noted that, orientation or the position relationship of the instruction such as term " " center ", " on ", D score, "left", "right", " vertically ", " level ", " interior ", " outward " be based on orientation shown in the drawings or position relationship; be for only for ease of the description present invention and simplifying and describe; rather than instruction or imply indication device or element must have specific orientation, with specific azimuth configuration and operation, be therefore not considered as limiting the invention.
Additionally, term " first ", " second ", " the 3rd " are only for descriptive purposes, and it is not intended that indicate or hint relative importance.
In describing the invention, it is necessary to explanation, unless otherwise clearly defined and limited, term " installation ", " being connected ", " connection " should be interpreted broadly, for instance, it is possible to it is fixing connection, it is also possible to be removably connect, or connect integratedly；Can be mechanically connected, it is also possible to be electrical connection；Can be joined directly together, it is also possible to be indirectly connected to by intermediary, it is possible to be the connection of two element internals.For the ordinary skill in the art, it is possible to concrete condition understands above-mentioned term concrete meaning in the present invention.
As shown in drawings, the invention provides a kind of angle of spot hole enhanced processing method, adopt angle of spot hole ultrasonic impact extrusion intensifying device that the angle of spot hole edge in processed hole is carried out supersonic frequency impact extrusion process, make material near angle of spot hole produce plastic deformation.
It is preferred embodiment that the ultrasonic impact extrusion intensifying device of angle of spot hole, including supersonic generator 10, transducer 2, horn 3, tool heads 6 and housing 1；
Described supersonic generator 10 is arranged on one end of housing 1；
Described transducer 2 is arranged on the inside of described housing 1；
One end of described horn 3 connects described housing 1；
The other end of described horn 3 is provided with described tool heads 6；
Described tool heads 6 includes lead 14, impact extrusion portion 13 and connecting portion 11；
One end of described connecting portion 11 is fixing with the one end in described impact extrusion portion 13 to be connected；
The other end of described connecting portion 11 and described horn 3 removably connect；
Described impact extrusion portion 13 is round platform；
Bigger one end, the bottom surface of described round platform is fixing with described connecting portion 11 to be connected；
Less one end, the bottom surface of described round platform is fixing with one end of described lead 14 to be connected；
Described connecting portion 11, described impact extrusion portion 13 and described lead 14 are coaxially disposed.
The present invention provides angle of spot hole 17 strengthening and processing device in a kind of hole on part or structure.It is made up of ultrasonic cold punching caulking gun, tool heads 6 and supersonic generator 10.The composition of assembly is as follows with effect:
The effect of ultrasonic cold punching caulking gun is to provide supersonic frequency impact extrusion power for tool heads 6.Ultrasonic cold punching caulking gun is made up of transducer 2, housing 1 and horn 3.Wherein, transducer 2 and horn 3 are mechanically coupled together, and link together with shell.Electric oscillation signal from supersonic generator 10 is converted to the mechanical vibration of same frequency by transducer 2, and carries out cumulative and Amplitude amplification rear drive tool heads 6 through horn 3.It is operated by handle and ultrasonic cold punching caulking gun can be carried out hand-held, it is also possible to be connected with lathe, it is achieved on lathe, carry out the ultrasonic cold impact extrusion strengthening in hole.The important technological parameters of ultrasonic cold punching caulking gun is: frequency of vibration is between 15kHz～30kHz, and the output amplitude of horn 3 end is between 10 μm～50 μm.
Tool heads 6 has lead 14, impact extrusion portion 13 and connecting portion 11, its effect is that the supersonic frequency accepted from horn 3 vibrates, and carry out impacting impact extrusion effect to the edge of the angle of spot hole 17 in processed hole by impact extrusion portion 13, angle of spot hole 17 skirt materials is made to produce plastically deforming area, thus realizing the purpose of angle of spot hole 17 strengthening.The axis coaxle of supersonic vibration direction and ultrasonic impact extrusion tool heads 6, connecting portion 11 is connected with the outfan fastening of horn 3 with mechanical connection manner.The side in impact extrusion portion 13 can be the conical surface, arc surface, catenary curved surface or index curved surface, but is not limited to above-mentioned several curved surface, and lead 14 is used for positioning and leading.The surface roughness Ra in impact extrusion portion 13 is less than 0.5 micron, and hardness is determined according to processed material, and general HRC is between 45～65.
Transition part 12 it is provided with between connecting portion 11 and impact extrusion portion 13；One end of transition part 12 is connected with connecting portion 11 transition；The other end of transition part 12 is fixing with impact extrusion portion 13 to be connected.
Setting by transition part 12, the structure of connecting portion 11 and impact extrusion portion 13 can be changed flexibly, and the distance in connecting portion 11 and impact extrusion portion 13 also becomes adjustable, and then according to the concrete condition in actual processed hole 16, transition part 12 can be adjusted, to reach the treatment effect of the best.
Supersonic generator 10 is used for converting industrial-frequency alternating current to supersonic frequency electric oscillation signal, and through the incoming ultrasonic cold punching caulking gun of cable, to drive transducer 2 that electric oscillation converts to the compressional wave mechanical vibration with frequency.The output electricity frequency of supersonic generator 10 is between 15kHz～30kHz.
The know-why of the present invention is: under supersonic frequency vibrational excitation, angle of spot hole 17 skirt materials of the initial apertures on processed part 7 is carried out impacting impact extrusion by the impact extrusion portion 13 of tool heads 6, it is made to produce plastic deformation, and make the crystal grain in plastically deforming area 15 be refined, because the elastic return of hole wall adjacent material makes material near angle of spot hole 17 produce circumference residual compressive stress after unloading.The synergy of refined crystalline strengthening and residual compressive stress makes the anti-fatigue performance in hole, anti-stress corrosion performance and wearability be improved.Different from quiet impact extrusion strengthening, the ultrasonic impact extrusion angle of spot hole 17 of the present invention is strengthened, because high strain rate, stress wave superimposition, temperature effects and ess-strain circulation can make processed material generation sound softening effect, thus the stream reducing processed material becomes drag, while producing severe plastic deformation, do not result in processed part 7 macroscopic deformation, and grain refining effect is obvious.
This device is different from dead load angle of spot hole impact extrusion strengthening, have employed ultrasonic activation and drives angle of spot hole 17 impact extrusion tool heads 6.Due to sound softening effect and dynamic impulsion impact extrusion, angle of spot hole 17 skirt materials local plastic deformation is violent, and grain refining effect is obvious.The residual compressive stress of the big degree of depth, amplitude can be introduced in angle of spot hole 17 region.The static pressure that workpiece is applied is little, can process thin-wall part pore structure, not result in macroscopic deformation.Chamfering or rounding can be generated at angle of spot hole 17, effectively reduce angle of spot hole 17 stress and concentrate.
It is preferred embodiment that the surface in described impact extrusion portion 13 is provided with lubricant.
A small amount of lubricant is smeared on the surface in the impact extrusion portion 13 of tool heads 6, it is possible to effectively avoid the damage that angle of spot hole 17 is caused by the bigger friction between impact extrusion portion 13 and angle of spot hole 17.
With lubricator it is generally the kollag of good pressure-resistant performance, such as the graphite being in harmonious proportion through lubricating oil, or through molybdenum bisuphide that lubricating oil is in harmonious proportion, it is possible to use oil lubricant, such as animal oil, vegetable oil and mineral oil, notices that lubricating layer is not easily too thick.
It is preferred embodiment that described transducer 2 is provided with cooling fan 8 away from one end of described horn 3.
At transducer 2, cooling fan 8 is set away from one end of horn 3, and cooling fan 8 is also disposed at housing 1 inside, so, the rotation of cooling fan 8 can be passed through, transducer 2 is dispelled the heat, and then increasing the working life of transducer 2 and work efficiency, it is to avoid transducer 2 is due to overheated and out-of-work situation of having to occurs.
It is preferred embodiment that described horn 3 is arranged in described housing 1 by retainer ring 5；
Described retainer ring 5 is arranged on described horn 3 one end away from transducer 2.
Horn 3 is fixedly installed in housing 1 by retainer ring 5, by increasing capacitance it is possible to increase horn 3 and the stability in housing 1 and fastness, effectively avoids the situation appearance that horn 3 is scurried out when vibration in housing 1.
The outside of the inner side of retainer ring 5 and horn 3 offsets, the inner side of the outside of retainer ring 5 and housing 1 offsets, horn 3 arranges a stopper section 4 matched with housing 1, stopper section 4 is clipped in the middle by retainer ring 5 and housing 1, avoid the play of horn 3, and then ensure that the normal operation of horn 3.
Connected mode between retainer ring 5 with housing 1 can be weld, it is also possible to is threaded, it is also possible to is interference fit, as long as retainer ring 5 can be fixedly installed on housing 1 inside by it.
It is preferred embodiment that described transducer 2 is magnetostrictive transducer or piezoelectric ceramic transducer.
The mechanical strength of metal magnetostrictive transducer is high, and task performance is stable, and unit are radiant power is big, and monomer power capacity is big.In high strength supersonic field, impact because of mechanical resistant and surge ability is used widely by force.Magnetostrictive transducer is because having the relatively low Q-value acutance of energy peak (Q be), so it can transmit very wide frequency, for instance: transmitting frequency range for the ultrasound wave magnetostrictive transducer of 20kHz is 17～23kHz.
Piezoelectric ceramic transducer by piezoelectric ceramic piece and light, weigh two kinds of metals and form, at a certain temperature after polarization processes, there is piezoelectric effect.In a simple situation, when piezoelectric is subject to the stress F consistent with polarised direction, polarised direction produces certain magnetic field intensity E, between them, have a simple linear relationship E=gF；Otherwise, when the applied voltage U consistent with polarised direction is added in piezoelectric, the telescopic shape change S of material and voltage U also linear relation S=dU.Proportionality constant g, d are called piezoelectric constant, relevant with material character.Owing to having simple linear relationship between E, S, F, U, therefore the simple alternating current signal of telecommunication just can be transformed into the flexible of piezoelectric longitudinal length by us, becomes the source of sound wave；Sound pressure variations can also be made equally to be changed into the change of voltage to receive acoustical signal.
It is preferred embodiment that the direction of vibration of described horn 3 is axial vibration.
The axial vibration of horn 3, the vibration that the part 7 that is processed provides the strongest can be given, and then reach farthest vibration to be passed to processed part 7, to reach to carry out impacting impact extrusion effect to angle of spot hole 17 edge in processed hole 16 by impact extrusion portion 13, make material near angle of spot hole 17 produce the effect of plastic deformation and grain refinement, after unloading, form residual compressive stress.
It is preferred embodiment that described transducer 2 and described horn 3 are coaxially disposed.
Transducer 2 and horn 3 being coaxially disposed, its effect is the same with the direction of vibration of horn 3, also for the vibration of transducer 2 can farthest pass to processed part 7.
It is preferred embodiment that described housing 1 is additionally provided with handle 9.
Housing 1 arranges handle 9, it is possible to by handle 9, whole angle of spot hole 17 strengthening and processing device is held, or be connected on lathe and operate, make operation more convenient.
It is preferred embodiment, after angle of spot hole 17 carries out vibration impact extrusion, adopt mechanical or manual technique for grinding to be processed by the flange that angle of spot hole 17 place produces.
Whole processing method main process comprises the steps:
1) machined burrs on processed hole 16 is removed in polishing, removes hole wall pollutant with ethanol or ethanol.
2) check ultrasonic impact extrusion tool heads 6 surface quality, and remove surface contaminant with ethanol or ethanol.
3) on the impact extrusion work surface of ultrasonic impact extrusion tool heads 6, a small amount of lubricant is smeared, with lubricator it is generally the kollag of good pressure-resistant performance, such as the graphite being in harmonious proportion through lubricating oil, or the molybdenum bisuphide through lubricating oil mediation, oil lubricant can also be used, such as animal oil, vegetable oil and mineral oil, notice that lubricating layer is not easily too thick.
4) by the guide post on the lever on ultrasonic cold punching caulking gun and ultrasonic impact extrusion tool heads 6, ultrasonic impact extrusion tool heads 6 is inserted processed hole 16, impact extrusion work surface is made to contact with angle of spot hole 17, and slightly exert pressure (pressure is typically in 1～5Kg), it is maintained with impact extrusion tool heads 6 coaxial with processed hole 16.
5) opening supersonic generator 10 and angle of spot hole 17 edge carries out ultrasonic impact extrusion, the ultrasonic impact extrusion time is different with requirement according to processed material, is typically between 15～120 seconds.
6), after process terminates, close ultrasonic generator, remove ultrasonic cold punching caulking gun.
7) ultrasonic impact extrusion strengthening generally can produce certain flange at bore edges, if processed hole 16 is bolt or riveted holes, mechanical or manual technique for grinding then should be adopted to be removed by flange, it should be noted that strengthening face can not be injured during polishing, and removal material of polishing is not easily too much.
8) after ultrasonic impact extrusion strengthening and grinding process, protection by spraying aqueous preventives coating near angle of spot hole 17, in order to avoid hole wall corrosion or oxidation.
Angle of spot hole 17 strengthening and processing device provided by the invention, adopt transducer 2 that the ultrasound wave that supersonic generator 10 sends is converted to mechanical vibration, after amplification again through horn 3, vibration is passed to the impact extrusion portion 13 in tool heads 6, by impact extrusion portion 13, angle of spot hole 17 edge is carried out supersonic frequency impact extrusion process, make material near angle of spot hole 17 produce plastic deformation, and then material produces the effect of grain refinement near angle of spot hole 17, after unloading, form residual compressive stress.The present invention introduces the big degree of depth, amplitude residual compressive stress near angle of spot hole 17；Material near angle of spot hole 17 is made to form Ultra-fine Grained；Generate chamfering or rounding transition at angle of spot hole 17, reduce angle of spot hole 17 stress and concentrate；The static pressure that workpiece is applied is little, can process thin-wall part pore structure；The resisting fatigue in hole, anti-stress corrosion performance and wearability are greatly improved
Last it is noted that various embodiments above is only in order to illustrate technical scheme, it is not intended to limit；Although the present invention being described in detail with reference to foregoing embodiments, it will be understood by those within the art that: the technical scheme described in foregoing embodiments still can be modified by it, or wherein some or all of technical characteristic is carried out equivalent replacement；And these amendments or replacement, do not make the essence of appropriate technical solution depart from the scope of various embodiments of the present invention technical scheme.
Claims (10)
1. an angle of spot hole enhanced processing method, it is characterised in that adopt angle of spot hole ultrasonic impact extrusion intensifying device that the angle of spot hole edge in processed hole is carried out supersonic frequency impact extrusion process, makes material near angle of spot hole produce plastic deformation.
2. angle of spot hole enhanced processing method according to claim 1, it is characterised in that the ultrasonic impact extrusion intensifying device of described angle of spot hole includes supersonic generator, transducer, horn, tool heads and housing；
Described supersonic generator is arranged on one end of housing；
Described transducer is arranged on the inside of described housing；
One end of described horn connects described housing；
The other end of described horn is provided with described tool heads；
Described tool heads includes lead, impact extrusion portion and connecting portion；
One end of described connecting portion is fixing with the one end in described impact extrusion portion to be connected；
The other end of described connecting portion and described horn removably connect；
Described impact extrusion portion has impact extrusion inclined-plane, it is possible to angle of spot hole is carried out impact extrusion；
Described connecting portion, described impact extrusion portion and described lead are coaxially disposed.
3. angle of spot hole enhanced processing method according to claim 2, it is characterised in that be provided with lubricant on the surface in described impact extrusion portion.
4. angle of spot hole enhanced processing method according to claim 2, it is characterised in that described transducer is provided with cooling fan away from one end of described horn.
5. angle of spot hole enhanced processing method according to claim 2, it is characterised in that described horn is arranged in described housing by retainer ring；
Described retainer ring is arranged on described horn one end away from transducer.
6. angle of spot hole enhanced processing method according to claim 2, it is characterised in that described transducer is magnetostrictive transducer or piezoelectric ceramic transducer.
7. angle of spot hole enhanced processing method according to claim 2, it is characterised in that the direction of vibration of described horn is axial vibration.
8. angle of spot hole enhanced processing method according to claim 2, it is characterised in that described transducer and described horn are coaxially disposed.
9. angle of spot hole enhanced processing method according to claim 2, it is characterised in that be additionally provided with handle on described housing.
10. the angle of spot hole enhanced processing method according to any one of claim 1-9, it is characterised in that after angle of spot hole carries out vibration impact extrusion, adopt mechanical or manual technique for grinding to be processed by the flange that angle of spot hole place produces.
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| CN201610290905.6A CN105779756B (en) | 2016-05-05 | 2016-05-05 | Angle of spot hole enhanced processing method |
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Cited By (5)
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| CN107012305A (en) * | 2017-03-24 | 2017-08-04 | 江苏大学 | A kind of ultrasonic coldworking strengthened method and device of structural member connecting hole |
| CN110055397A (en) * | 2019-04-28 | 2019-07-26 | 江苏大学 | Magnetic drive formula taper hole inner surface strengthening device |
| CN111975284A (en) * | 2020-08-20 | 2020-11-24 | 东风商用车有限公司 | Extrusion die and method for improving fatigue strength of hole end of metal plate |
| CN112210646A (en) * | 2020-09-29 | 2021-01-12 | 郑州大学 | Ultrasonic rolling strengthening device for V-shaped notch cylindrical fatigue test sample |
| CN112981067A (en) * | 2021-02-03 | 2021-06-18 | 四川大学 | Cold extrusion fatigue strengthening device and method for orifice with open pore structure |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107012305B (en) * | 2017-03-24 | 2018-11-06 | 江苏大学 | A kind of ultrasonic coldworking strengthened method and device of structural member connecting hole |
| CN110055397A (en) * | 2019-04-28 | 2019-07-26 | 江苏大学 | Magnetic drive formula taper hole inner surface strengthening device |
| CN111975284A (en) * | 2020-08-20 | 2020-11-24 | 东风商用车有限公司 | Extrusion die and method for improving fatigue strength of hole end of metal plate |
| CN112210646A (en) * | 2020-09-29 | 2021-01-12 | 郑州大学 | Ultrasonic rolling strengthening device for V-shaped notch cylindrical fatigue test sample |
| CN112210646B (en) * | 2020-09-29 | 2022-06-28 | 郑州大学 | Ultrasonic rolling strengthening device for V-notch cylindrical fatigue test sample |
| CN112981067A (en) * | 2021-02-03 | 2021-06-18 | 四川大学 | Cold extrusion fatigue strengthening device and method for orifice with open pore structure |
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| CN105779756B (en) | 2019-01-11 |
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