CN110747403B - Fatigue-resistant rivet and manufacturing method thereof - Google Patents
Fatigue-resistant rivet and manufacturing method thereof Download PDFInfo
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- 229910021389 graphene Inorganic materials 0.000 claims abstract description 75
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- 239000000956 alloy Substances 0.000 claims abstract description 51
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 50
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 48
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 37
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 28
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 26
- 229910052742 iron Inorganic materials 0.000 claims abstract description 24
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 claims abstract description 21
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 19
- 239000011572 manganese Substances 0.000 claims abstract description 19
- 229910052802 copper Inorganic materials 0.000 claims abstract description 17
- 239000010949 copper Substances 0.000 claims abstract description 17
- 238000013016 damping Methods 0.000 claims abstract description 16
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 claims abstract description 4
- 239000007788 liquid Substances 0.000 claims description 37
- 239000000843 powder Substances 0.000 claims description 33
- 239000006185 dispersion Substances 0.000 claims description 25
- 239000002131 composite material Substances 0.000 claims description 22
- 238000003723 Smelting Methods 0.000 claims description 19
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 18
- 238000000498 ball milling Methods 0.000 claims description 15
- 238000005245 sintering Methods 0.000 claims description 14
- 238000005266 casting Methods 0.000 claims description 12
- 238000002844 melting Methods 0.000 claims description 12
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- 229910052751 metal Inorganic materials 0.000 claims description 12
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- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 claims description 3
- 238000009768 microwave sintering Methods 0.000 claims description 3
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- 238000002360 preparation method Methods 0.000 claims 1
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- 229910000861 Mg alloy Inorganic materials 0.000 description 1
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- 238000009661 fatigue test Methods 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/10—Alloys containing non-metals
- C22C1/1036—Alloys containing non-metals starting from a melt
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/10—Alloys containing non-metals
- C22C1/1036—Alloys containing non-metals starting from a melt
- C22C1/1047—Alloys containing non-metals starting from a melt by mixing and casting liquid metal matrix composites
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C30/00—Alloys containing less than 50% by weight of each constituent
- C22C30/02—Alloys containing less than 50% by weight of each constituent containing copper
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/16—Ferrous alloys, e.g. steel alloys containing copper
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B19/00—Bolts without screw-thread; Pins, including deformable elements; Rivets
- F16B19/04—Rivets; Spigots or the like fastened by riveting
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/10—Alloys containing non-metals
- C22C1/1005—Pretreatment of the non-metallic additives
- C22C1/1015—Pretreatment of the non-metallic additives by preparing or treating a non-metallic additive preform
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- General Engineering & Computer Science (AREA)
- Composite Materials (AREA)
- Powder Metallurgy (AREA)
- Insertion Pins And Rivets (AREA)
Abstract
The present disclosure relates to a fatigue resistant rivet comprising a vibration reducing alloy comprising iron, aluminum, manganese, copper, graphene; relative to 100 parts by weight of the vibration damping alloy, the content of iron is 35-65 parts by weight, the content of aluminum is 15-35 parts by weight, the content of manganese is 10-25 parts by weight, the content of copper is 4-12 parts by weight, and the content of graphene is 0.005-0.5 part by weight. This fatigue-resistant rivet can turn into heat energy with vibration energy, reduces fatigue loss to improve the fatigue strength of part, reduce vibration noise simultaneously, improve the sense of hearing comfort, improve the factor of safety of rivet connection mode.
Description
Technical Field
The disclosure relates to the field of material connection, in particular to a fatigue-resistant rivet and a manufacturing method thereof.
Background
With the development of the automobile industry, the traditional automobile materials mainly made of steel are developing towards the trend of steel-aluminum mixing, all-aluminum automobile bodies, plastic composite materials, magnesium alloys and other multi-material mixing applications. The mixed application of multiple materials brings various requirements of new material connection technology, and various connection modes such as riveting, bonding and composite connection are rapidly developed in the automobile industry.
Rivet connection is generally concerned and widely used as an important connection means, but the safety factor of the rivet connection mode is generally lower than that of other connection modes.
Disclosure of Invention
The disclosure provides a fatigue-resistant rivet and a manufacturing method thereof in order to improve the safety factor of a rivet connection mode in the using process.
In order to achieve the above object, a first aspect of the present disclosure provides a fatigue-resistant rivet comprising a vibration-damping alloy containing iron, aluminum, manganese, copper, graphene;
relative to 100 parts by weight of the vibration damping alloy, the content of iron is 35-65 parts by weight, the content of aluminum is 15-35 parts by weight, the content of manganese is 10-25 parts by weight, the content of copper is 4-12 parts by weight, and the content of graphene is 0.005-0.5 part by weight.
Optionally, based on 100 parts by weight of the vibration-damping alloy, the content of iron is 40-55 parts by weight, the content of aluminum is 25-30 parts by weight, the content of manganese is 12-18 parts by weight, the content of copper is 7-10 parts by weight, and the content of graphene is 0.05-0.1 part by weight.
Optionally, the fatigue resistant rivet is one or more of a self-piercing rivet, a blind rivet and a clinch nut.
A second aspect of the present disclosure provides a method of making a fatigue-resistant rivet according to the first aspect of the present disclosure, the method comprising:
s1: dispersing graphene powder in a solvent to prepare a graphene dispersion liquid; adding aluminum powder or copper powder into the graphene dispersion liquid, performing ball milling and drying on the obtained mixed dispersion liquid to obtain aluminum/copper-graphene composite powder, and sintering the composite powder to obtain an aluminum/copper-graphene precast ingot; the concentration of the graphene dispersion liquid is 0.01-3.0%; s2: melting and mixing metal iron and metal manganese with the prefabricated ingot, and then casting to obtain an alloy ingot;
s3: and turning the alloy ingot casting to obtain the fatigue-resistant rivet.
Optionally, the sintering is one of ion sintering, microwave sintering and sinter hardening; the ball milling and drying are performed in an inert atmosphere comprising one or more of nitrogen, argon, helium.
Optionally, step S2 further includes:
melting metallic iron in a vacuum melting furnace at a first temperature and a first vacuum degree in an argon atmosphere to obtain a first molten liquid;
adding metal manganese into the first smelting liquid at a second temperature and a second pressure in an argon atmosphere, and mixing and melting to obtain a second smelting liquid;
and adding the aluminum/copper-graphene precast ingot into the second smelting liquid, stirring and mixing, and casting the obtained mixed smelting liquid to obtain the alloy ingot.
Alternatively, the purity of the metallic aluminum powder and the metallic copper powder are each independently 99.9 wt% or more, and the particle size is each independently 15 to 30 μm; the ball milling time is 6-12h, and the rotating speed is 600-1000 rpm/min.
Optionally, the first temperature is 1550-.
Optionally, the first vacuum degree is 0.5-0.8Pa, and the second pressure is 90-130 kPa.
A third aspect of the present disclosure provides a vehicle incorporating a fatigue-resistant rivet according to the first aspect of the present disclosure.
This fatigue-resistant rivet can turn into heat energy with vibration energy, reduces fatigue loss to improve the fatigue strength of part, can reduce vibration noise simultaneously, improve the sense of hearing comfort, improve the factor of safety of rivet connection mode.
Additional features and advantages of the disclosure will be set forth in the detailed description which follows.
Drawings
The accompanying drawings, which are included to provide a further understanding of the disclosure and are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and together with the description serve to explain the disclosure without limiting the disclosure. In the drawings:
FIG. 1 is a schematic view of one embodiment of a fatigue resistant rivet of the present disclosure.
Detailed Description
The following detailed description of specific embodiments of the present disclosure is provided in connection with the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present disclosure, are given by way of illustration and explanation only, not limitation.
A first aspect of the present disclosure provides a fatigue-resistant rivet, which contains a vibration-damping alloy, wherein the vibration-damping alloy contains iron, aluminum, manganese, copper, and graphene; the content of iron may be 35-65 parts by weight, the content of aluminum may be 15-35 parts by weight, the content of manganese may be 10-25 parts by weight, the content of copper may be 4-12 parts by weight, and the content of graphene may be 0.005-0.5 parts by weight, with respect to 100 parts by weight of the vibration-damping alloy.
This fatigue-resistant rivet of this disclosure adopts the damping alloy, can turn into vibration energy heat energy, reduces fatigue loss to improve the fatigue strength of part, can reduce vibration noise simultaneously, improve sense of hearing comfort, improve the factor of safety of rivet connection mode.
In a particularly preferred embodiment according to the present disclosure, the content of iron may be 40 to 55 parts by weight, the content of aluminum may be 25 to 30 parts by weight, the content of manganese may be 12 to 18 parts by weight, the content of copper may be 7 to 10 parts by weight, and the content of graphene may be 0.05 to 0.1 parts by weight, based on 100 parts by weight of the vibration-damping alloy. The vibration reduction alloy in the range can better convert vibration energy into heat energy, improve the fatigue resistance of the component and reduce vibration noise.
According to the present disclosure, the fatigue-resistant rivet made of the vibration-damping alloy of the present disclosure may be one or more of a self-piercing rivet, a blind rivet, and a clinch nut, and preferably may be a self-piercing rivet or a blind rivet, without limitation in form.
A second aspect of the present disclosure provides a method of making a fatigue-resistant rivet of the first aspect of the present disclosure, the method comprising: s1: dispersing graphene powder in a solvent to prepare a graphene dispersion liquid; adding aluminum metal powder or copper metal powder into graphene dispersion liquid, performing ball milling and drying on the obtained mixed dispersion liquid to obtain aluminum/copper-graphene composite powder, and sintering the composite powder to obtain an aluminum/copper-graphene prefabricated ingot, wherein the concentration of the graphene dispersion liquid can be 0.01-3.0%, preferably 0.2-0.8%; s2: melting and mixing metal iron and metal manganese with the prefabricated ingot, and then casting to obtain an alloy ingot; s3: and turning the alloy ingot casting to obtain the fatigue-resistant rivet.
The prepared graphene dispersion liquid in the range can ensure that the graphene is uniformly distributed in the prepared alloy, and the vibration reduction effect is further improved. The vibration-damping alloy with the effect of converting vibration energy into heat energy can be prepared by the method, so that the fatigue wear of the finally prepared fatigue-resistant rivet in the using process is reduced, the service life and the mechanical strength are prolonged, meanwhile, the noise can be reduced, the hearing comfort level is improved, and the safety coefficient of a rivet connection mode is improved.
In a specific embodiment according to the present disclosure, aluminum powder or copper powder is added to the graphene dispersion liquid to be ball-milled and dried, so as to obtain aluminum/copper-graphene composite powder, and then the composite powder is sintered, so as to obtain an aluminum/copper-graphene precast ingot. Wherein, the sintering mode can be one of ion sintering, microwave sintering and sintering hardening, and preferably the ion sintering; the ball milling and drying process may be carried out in an inert atmosphere, which may include one or more of nitrogen, argon, helium, and preferably may be nitrogen or argon.
In order to enable various metals to be more uniformly dispersed in the vibration-damping alloy, the metal iron and the metal manganese are respectively added in two steps in the process of preparing the alloy ingot in the step S2. In one embodiment according to the present disclosure, metallic iron is melted in a melting furnace having a certain degree of vacuum at a first temperature under a first degree of vacuum in an argon atmosphere to obtain a first melt; then, filling argon into the smelting furnace to a second pressure so as to discharge air entering the smelting furnace when the manganese metal is added, and ensuring the oxygen-free environment in the smelting process, so that the manganese metal is added into the first smelting liquid in the argon atmosphere at a second temperature and a second pressure, and mixing and melting are carried out to obtain a second smelting liquid; and finally, adding the prepared aluminum/copper-graphene precast ingot into a second smelting solution, stirring and mixing, and casting the obtained mixed smelting solution to obtain an alloy cast ingot.
According to the present disclosure, the purity of the metallic aluminum powder and the metallic copper powder may be 99.9 wt% or more, preferably 99.99 wt% or more, each independently; the particle size may each independently be 15 to 30 μm, preferably 20 to 25 μm; the ball milling time is 6-12h, preferably 7-8 h; the rotation speed can be 600-1000rpm/min, preferably 700-800 rpm/min.
In one embodiment according to the present disclosure, the first temperature may be 1550-. The second temperature can be 1100-1400 ℃, preferably 1180-1230 ℃, and the second temperature in the range can save energy sources on the basis of realizing the full melting and mixing of the metals.
In one embodiment according to the present disclosure, the first vacuum degree may be 0.5 to 0.8Pa, preferably may be 0.6 to 0.7 Pa; the second pressure may be 90-130kPa, preferably may be 100-110kPa, during which argon is used to adjust the pressure so that the smelting process is always carried out in an oxygen-free atmosphere.
A third aspect of the disclosure provides a vehicle incorporating the fatigue resistant rivet of the first aspect of the disclosure.
The vehicle adopting the fatigue rivet converts vibration energy of parts into heat energy, reduces fatigue loss, reduces vibration noise and improves hearing comfort.
The present disclosure is further illustrated by the following examples, but is not to be construed as being limited thereby.
Example 1
S1 a: preparing a graphene dispersion liquid: adding 10g of graphene powder into 1L of absolute ethyl alcohol, and performing ultrasonic dispersion to obtain a graphene dispersion liquid with the concentration of 1.0%;
s1 b: preparing composite powder: adding 1990g of copper metal powder into graphene dispersion liquid, then carrying out mixed ball milling for 8h under the protection of argon, wherein the ball milling speed is 800rpm/min, and then carrying out vacuum drying treatment to obtain composite powder, wherein the graphene accounts for 0.5 wt% of the total weight of the composite powder, the purity of the copper powder is more than or equal to 99.9 wt%, the mesh number is 500 meshes, and the particle size is 25 micrometers; preparing the obtained composite powder into a copper-graphene precast ingot by an ion sintering method;
s2: preparing an alloy ingot: weighing the raw materials according to the weight percentage, and weighing 50 parts of iron, 30 parts of aluminum, 13 parts of manganese and 7 parts of copper-graphene precast ingot relative to 100 parts of vibration reduction alloy; firstly, heating a vacuum smelting furnace to 1550-; adding a copper-graphene precast ingot, and uniformly stirring by using a stone grinding rod; directly casting a water-cooled copper mold into an ingot to obtain a ferro-manganese-aluminum-copper-graphene vibration reduction alloy ingot;
s3: the graphene alloy ingot was processed into a phi 536mm clinch rivet by a high-speed turning process as shown in fig. 1, in which a represents that the diameter of the opening of the rivet was 3.5mm, B represents that the effective length of the rivet was 4.9mm, C represents that the length of the rivet was 6.0mm, D represents that the diameter of the leg portion of the rivet was 5.3mm, and E represents that the diameter of the head portion of the rivet was 7.75mm, and a clinch test was performed.
Example 2
S1 a: preparing a graphene dispersion liquid: adding 10g of graphene powder into 1.5L of absolute ethyl alcohol, and performing ultrasonic dispersion to obtain 0.67% graphene dispersion liquid;
s1 b: preparing composite powder: adding 2490g of aluminum metal powder into the graphene dispersion liquid, then carrying out mixed ball milling for 8 hours under the protection of argon, wherein the ball milling speed is 800rpm/min, and then carrying out vacuum drying treatment to obtain composite powder, wherein the graphene accounts for 0.4 wt% of the total weight of the composite powder, the purity of the aluminum powder is more than or equal to 99.9 wt%, the mesh number is 600 meshes, and the particle size is 21 microns; preparing the obtained composite powder into an aluminum-graphene precast ingot by an ion sintering method;
s2: preparing an alloy ingot: weighing raw materials according to weight percentage, and weighing 45 parts of iron, 30 parts of aluminum-graphene precast ingot, 15 parts of manganese and 10 parts of copper relative to 100 parts of vibration reduction alloy; firstly, heating a vacuum smelting furnace to 1550-; adding an aluminum-graphene precast ingot, and then uniformly stirring by using a stone grinding rod; directly casting a water-cooled copper mold into an ingot to obtain a ferro-manganese-aluminum-copper-graphene vibration reduction alloy ingot;
s3: the graphene alloy ingot is processed into a phi 536mm rivet lock rivet (same size as in example 1) by a high-speed turning process, and a riveting test is performed as shown in fig. 1.
Example 3
S1 a: preparing a graphene dispersion liquid: adding 12g of graphene powder into 4.0L of absolute ethyl alcohol, and performing ultrasonic dispersion to obtain 0.3% graphene dispersion liquid;
s1 b: preparing composite powder: adding 2488g of aluminum metal powder into the graphene dispersion liquid, then carrying out mixed ball milling for 8 hours under the protection of argon, wherein the ball milling speed is 800rpm/min, and then carrying out vacuum drying treatment to obtain composite powder, wherein the graphene accounts for 0.48 wt% of the total weight of the composite powder, the purity of the aluminum powder is more than or equal to 99.9 wt%, the mesh number is 500 meshes, and the particle size is 25 micrometers; preparing the obtained composite powder into an aluminum-graphene precast ingot by an ion sintering method;
s2: preparing an alloy ingot: weighing the raw materials according to the weight percentage, and weighing 42 parts of iron, 33 parts of aluminum-graphene precast ingot, 15 parts of manganese and 10 parts of copper relative to 100 parts of vibration reduction alloy; firstly, heating a vacuum smelting furnace to 1550-; adding an aluminum-graphene precast ingot, and then uniformly stirring by using a stone grinding rod; directly casting a water-cooled copper mold into an ingot to obtain a ferro-manganese-aluminum-copper-graphene vibration reduction alloy ingot;
s3: the graphene alloy ingot is processed into a phi 536mm rivet lock rivet (same size as in example 1) by a high-speed turning process, and a riveting test is performed as shown in fig. 1.
Example 4
A fatigue resistant rivet was made using the protocol of example 1, except that,
s2: preparing an alloy ingot: weighing the raw materials according to the weight percentage, and weighing 38 parts of iron, 33 parts of aluminum, 18 parts of manganese and 11 parts of copper-graphene precast ingot relative to 100 parts of vibration reduction alloy;
the graphene alloy ingot is processed into a phi 536mm rivet lock rivet (same size as in example 1) by a high-speed turning process, and a riveting test is performed as shown in fig. 1.
Comparative example 1
A Purlie phi 536mm self-piercing carbon steel rivet (same size as example 1) was commercially available for the riveting test.
Comparative example 2
A fatigue resistant rivet was made using the protocol of example 1, except that,
s2: preparing an alloy ingot: weighing raw materials according to weight percentage, and weighing 30 parts of iron, 44 parts of aluminum, 18 parts of manganese and 8 parts of copper-graphene precast ingot relative to 100 parts of vibration reduction alloy;
the graphene alloy ingot is processed into a phi 536mm rivet lock rivet (same size as in example 1) by a high-speed turning process, and a riveting test is performed as shown in fig. 1.
Comparative example 3
A fatigue resistant rivet was made using the protocol of example 1, except that,
step S1 a: preparing a graphene dispersion liquid: adding 40g of graphene powder into 1.0L of absolute ethyl alcohol, and performing ultrasonic dispersion to obtain a graphene dispersion liquid with the concentration of 4.0%;
the graphene alloy ingot is processed into a phi 536mm rivet lock rivet (same size as in example 1) by a high-speed turning process, and a riveting test is performed as shown in fig. 1.
Comparative example 4
A fatigue resistant rivet was made using the protocol of example 1, except that,
s2: preparing an alloy ingot: weighing raw materials according to weight percentage, and weighing 44 parts of iron, 30 parts of aluminum, 16 parts of manganese and 10 parts of copper relative to 100 parts of vibration reduction alloy;
the alloy ingot was processed into a phi 536mm clinch rivet (same size as example 1) by a high speed turning process, as shown in fig. 1, and a clinching test was performed.
Test example
The rivets are respectively adopted to carry out sample riveting and fatigue strength test, and the test is carried out according to the GB/T15111-1994 standard. The riveting plate is a 5182 aluminum alloy plate, the size is 120mm multiplied by 38mm multiplied by 2mm, and the area of the plate in the test overlapping area is 38mm multiplied by 38 mm; the riveting equipment is a Poise numerical control servo EPRN50, the pretightening force is set to be 5KN, and the riveting force is set to be 25 KN; fatigue tests were tested using an MTS E64 electro-servo hydraulic fatigue tester. And (3) testing conditions are as follows: the fatigue load is 4.5KN, the load minimum and maximum load ratio R is 0.1, the test frequency is 20Hz, and the experimental results are shown in Table 1.
TABLE 1 fatigue and Life-table for different rivets
As can be seen from the above experimental results table 1, the fatigue-resistant rivet prepared according to the scheme of the present disclosure has a longer fatigue life than a commercially available or graphene-free rivet under the same experimental load, vibration frequency, etc., thereby improving the fatigue strength of the component and the safety of the rivet connection manner.
The preferred embodiments of the present disclosure are described in detail with reference to the accompanying drawings, however, the present disclosure is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solution of the present disclosure within the technical idea of the present disclosure, and these simple modifications all belong to the protection scope of the present disclosure.
It should be noted that, in the foregoing embodiments, various features described in the above embodiments may be combined in any suitable manner, and in order to avoid unnecessary repetition, various combinations that are possible in the present disclosure are not described again.
In addition, any combination of various embodiments of the present disclosure may be made, and the same should be considered as the disclosure of the present disclosure, as long as it does not depart from the spirit of the present disclosure.
Claims (9)
1. The fatigue-resistant rivet is characterized by consisting of a vibration-damping alloy, wherein the vibration-damping alloy contains iron, aluminum, manganese, copper and graphene;
relative to 100 parts by weight of the vibration damping alloy, the content of iron is 35-65 parts by weight, the content of aluminum is 15-35 parts by weight, the content of manganese is 10-25 parts by weight, the content of copper is 4-12 parts by weight, and the content of graphene is 0.005-0.5 part by weight;
the fatigue-resistant rivet is prepared by a preparation method comprising the following steps:
s1: dispersing graphene powder in a solvent to prepare a graphene dispersion liquid; adding aluminum powder or copper powder into the graphene dispersion liquid, performing ball milling and drying on the obtained mixed dispersion liquid to obtain aluminum/copper-graphene composite powder, and sintering the composite powder to obtain an aluminum/copper-graphene precast ingot; the concentration of the graphene dispersion liquid is 0.01-3.0%;
s2: melting and mixing metal iron and metal manganese with the prefabricated ingot, and then casting to obtain an alloy ingot;
s3: and turning the alloy ingot casting to obtain the fatigue-resistant rivet.
2. A fatigue-resistant rivet according to claim 1, wherein the content of iron is 40 to 55 parts by weight, the content of aluminum is 25 to 30 parts by weight, the content of manganese is 12 to 18 parts by weight, the content of copper is 7 to 10 parts by weight, and the content of graphene is 0.05 to 0.1 part by weight, based on 100 parts by weight of the vibration-damping alloy.
3. A fatigue resistant rivet according to claim 1, wherein the fatigue resistant rivet is one or more of a self-piercing rivet, a blind rivet and a clinch nut.
4. A fatigue-resistant rivet according to claim 1, wherein the sintering is one of ion sintering, microwave sintering, and sinter hardening; the ball milling and drying are performed in an inert atmosphere comprising one or more of nitrogen, argon, helium.
5. A fatigue-resistant rivet according to claim 1, wherein step S2 further comprises:
melting metallic iron in a vacuum melting furnace at a first temperature and a first vacuum degree in an argon atmosphere to obtain a first molten liquid;
adding metal manganese into the first smelting liquid at a second temperature and a second pressure in an argon atmosphere, and mixing and melting to obtain a second smelting liquid;
and adding the aluminum/copper-graphene precast ingot into the second smelting liquid, stirring and mixing, and casting the obtained mixed smelting liquid to obtain the alloy ingot.
6. A fatigue-resistant rivet according to claim 1, wherein the aluminum metal powder and the copper metal powder each independently have a purity of 99.9 wt% or more and a grain size of 15 to 30 μm; the ball milling time is 6-12h, and the rotating speed is 600-1000 rpm/min.
7. The fatigue-resistant rivet as claimed in claim 1, wherein the first temperature is 1550-.
8. A fatigue-resistant rivet according to claim 1, wherein the first vacuum is 0.5-0.8Pa and the second pressure is 90-130 kPa.
9. A vehicle comprising a fatigue resistant rivet according to any one of claims 1 to 3.
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| US5976709A (en) * | 1996-05-31 | 1999-11-02 | Hitachi Kinzoku Kabushiki Kaisha | Aluminum alloy member, with insert provided therein, possessing improved damping capacity and process for producing the same |
| US20100003159A1 (en) * | 2005-10-14 | 2010-01-07 | Tzeng-Feng Liu | Low-density high-toughness alloy and the fabrication method thereof |
| JP2011214127A (en) * | 2010-03-31 | 2011-10-27 | Tk Techno Consulting:Kk | Vibration-suppression/base-isolation damper device |
| JP6308424B2 (en) * | 2014-02-28 | 2018-04-11 | 株式会社日本製鋼所 | Fe-based damping alloy, method for producing the same, and Fe-based damping alloy material |
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