CN112872280B - Semi-hollow rivet riveting process for connecting aluminum alloy section bar and aluminum alloy casting - Google Patents
Semi-hollow rivet riveting process for connecting aluminum alloy section bar and aluminum alloy casting Download PDFInfo
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- 229910000838 Al alloy Inorganic materials 0.000 title claims abstract description 86
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- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 18
- 238000005238 degreasing Methods 0.000 claims description 17
- 239000008367 deionised water Substances 0.000 claims description 14
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 14
- UIIMBOGNXHQVGW-UHFFFAOYSA-M Sodium bicarbonate Chemical compound [Na+].OC([O-])=O UIIMBOGNXHQVGW-UHFFFAOYSA-M 0.000 claims description 12
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- 235000017557 sodium bicarbonate Nutrition 0.000 claims description 6
- 239000001509 sodium citrate Substances 0.000 claims description 6
- NLJMYIDDQXHKNR-UHFFFAOYSA-K sodium citrate Chemical compound O.O.[Na+].[Na+].[Na+].[O-]C(=O)CC(O)(CC([O-])=O)C([O-])=O NLJMYIDDQXHKNR-UHFFFAOYSA-K 0.000 claims description 6
- GVGUFUZHNYFZLC-UHFFFAOYSA-N dodecyl benzenesulfonate;sodium Chemical compound [Na].CCCCCCCCCCCCOS(=O)(=O)C1=CC=CC=C1 GVGUFUZHNYFZLC-UHFFFAOYSA-N 0.000 claims description 2
- 238000003825 pressing Methods 0.000 claims description 2
- 229940080264 sodium dodecylbenzenesulfonate Drugs 0.000 claims description 2
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- 229910052782 aluminium Inorganic materials 0.000 abstract description 38
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Images
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J15/00—Riveting
- B21J15/02—Riveting procedures
- B21J15/025—Setting self-piercing rivets
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J15/00—Riveting
- B21J15/02—Riveting procedures
- B21J15/04—Riveting hollow rivets mechanically
-
- C—CHEMISTRY; METALLURGY
- C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
- C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
- C11D1/00—Detergent compositions based essentially on surface-active compounds; Use of these compounds as a detergent
- C11D1/02—Anionic compounds
- C11D1/12—Sulfonic acids or sulfuric acid esters; Salts thereof
- C11D1/22—Sulfonic acids or sulfuric acid esters; Salts thereof derived from aromatic compounds
-
- C—CHEMISTRY; METALLURGY
- C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
- C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
- C11D3/00—Other compounding ingredients of detergent compositions covered in group C11D1/00
- C11D3/02—Inorganic compounds ; Elemental compounds
- C11D3/04—Water-soluble compounds
- C11D3/044—Hydroxides or bases
-
- C—CHEMISTRY; METALLURGY
- C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
- C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
- C11D3/00—Other compounding ingredients of detergent compositions covered in group C11D1/00
- C11D3/02—Inorganic compounds ; Elemental compounds
- C11D3/04—Water-soluble compounds
- C11D3/10—Carbonates ; Bicarbonates
-
- C—CHEMISTRY; METALLURGY
- C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
- C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
- C11D3/00—Other compounding ingredients of detergent compositions covered in group C11D1/00
- C11D3/16—Organic compounds
- C11D3/20—Organic compounds containing oxygen
- C11D3/2075—Carboxylic acids-salts thereof
- C11D3/2086—Hydroxy carboxylic acids-salts thereof
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C21/00—Alloys based on aluminium
- C22C21/02—Alloys based on aluminium with silicon as the next major constituent
-
- 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
- F16B19/08—Hollow rivets; Multi-part rivets
- F16B19/086—Self-piercing rivets
-
- 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
- F16B5/00—Joining sheets or plates, e.g. panels, to one another or to strips or bars parallel to them
- F16B5/04—Joining sheets or plates, e.g. panels, to one another or to strips or bars parallel to them by means of riveting
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Abstract
The invention belongs to the technical field of alloy material processing, and particularly relates to a semi-hollow rivet riveting process for connecting an aluminum alloy section bar and an aluminum alloy casting. According to the invention, a welding process is replaced by self-piercing riveting of the semi-hollow rivet, the rivet leg expands to the periphery under the combined action of the shape of the rivet leg and the protrusion of the casting piece, so that a mechanical interlocking structure between the rivet and the aluminum profile is formed, the aluminum alloy casting piece and the aluminum alloy profile are tightly combined, the riveting strength is high, and the defects of air holes, hot cracks and the like generated in traditional welding are avoided. The riveting process is suitable for connection of the new energy automobile aluminum alloy battery box, the frame, the support, the end plate, the battery core fixing and the like, and is low in investment and subsequent operation and maintenance funds relative to laser welding equipment, safe and reliable in riveting strength, simple in process, convenient to operate and high in economic benefit.
Description
Technical Field
The invention belongs to the technical field of alloy material processing, and particularly relates to a semi-hollow rivet riveting process for connecting an aluminum alloy section bar and an aluminum alloy casting.
Background
The existing new energy automobile is used for connecting an aluminum alloy cast end plate of a battery fixing structure with a profile part by adopting a laser welding process, but the welding process currently faces the following problems:
1. the aluminum alloy is easy to form an oxide film on the surface at high temperature, the oxide film is easy to absorb moisture in the environment, the moisture is decomposed to generate hydrogen when heated by laser, the solubility of the hydrogen in the liquid aluminum is about 20 times of the solubility of the hydrogen in the solid aluminum, the solubility of the hydrogen is rapidly reduced when the liquid aluminum is converted into the solid state in the instant solidification process of the alloy, and the redundant hydrogen in the liquid aluminum can form hydrogen holes if the redundant hydrogen cannot float upwards and overflow smoothly;
2. the keyhole is collapsed, the self gravity and the atmospheric pressure in the welding small hole are in an equilibrium state, once the equilibrium is broken, the liquid metal in the molten pool cannot timely flow to fill the irregular holes, and researches find that the magnesium content of the inner wall of the holes is about 4 times of that of the welding seams; the cooling speed of laser welding is too high, so that the problem of hydrogen holes is more serious, and holes generated by collapse of small holes are more in laser welding;
3. hot cracks, which are easily generated during welding, including weld joint crystallization cracks and liquefaction cracks, are formed when the aluminum alloy belongs to typical eutectic alloy; typically crystallization cracks appear in the weld zone and liquefaction cracks appear in the near-seam zone; the crack sensitivity of the Al-Mg-Si alloy, especially 6000 series Al-Mg-Si alloy, is high, the parent metal is subjected to rapid heating and cooling, and in the instant solidification and crystallization process, crystal grains grow along the direction vertical to the center of the welding seam due to the high supercooling degree, and Al-Si or Mg-Si and Al-Mg are formed at the columnar crystal boundary 2 Si and other low-melting-point eutectic compounds weaken the bonding force of crystal faces and are easy to generate crystallization cracks under the action of thermal stress; in the aluminum alloy welding process, elements (Mg, zn, mn, si and the like) with low boiling points are easy to evaporate and burn, and the slower the welding speed is, the more serious the burn is, so that the chemical composition of weld metal is changed; because the component segregation of the weld zone can generate eutectic segregation to generate grain boundary melting, liquefied cracks can be formed at the grain boundary under the action of stress, and the performance of the welded joint is reduced;
4. the welding is easy, the aluminum has strong light and heat reflecting capability, no obvious color change exists when solid and liquid are converted, and the judgment is difficult during the welding operation; the high-temperature aluminum has low strength, difficult supporting of a molten pool and easy penetration;
therefore, a new process needs to be developed to achieve better bonding of alloy profiles to castings.
Disclosure of Invention
The invention aims to solve the problems in the prior art and provides a novel semi-hollow rivet riveting process for connecting an aluminum alloy section and an aluminum alloy casting, which completely avoids the defects of air holes, hot cracks and the like generated by welding, and has high riveting strength, safety and reliability.
The above object of the present invention can be achieved by the following technical solutions: a semi-hollow rivet riveting process for connecting an aluminum alloy section bar and an aluminum alloy casting comprises the following process steps:
s1, treating a surface to be riveted of an aluminum alloy section and an aluminum alloy casting;
s2, fixing the aluminum alloy section with the surface treated by the blank holder, and simultaneously, vertically downwards pre-compacting the aluminum section by the rivet under the drive of a punching hammer;
s3, the rivet is pressed down by the power source to pierce the aluminum profile, and meanwhile, the rivet drives the aluminum profile to generate plastic deformation into the aluminum alloy casting;
s4, gradually filling the aluminum profile into the casting part along with the riveting;
and S5, when the punch hammer presses the rivet until the rivet head is in close contact with the upper surface of the aluminum profile and is flush with the upper surface of the aluminum profile, the riveting is completed, the blank holder releases the blank holder force, and the punch hammer returns to the initial station.
According to the invention, the self-piercing riveting is adopted to replace a welding process, the rivet leg is expanded to the periphery under the combined action of the shape of the rivet leg and the protrusion of the casting piece, so that a mechanical interlocking structure between the rivet and the aluminum profile is formed, the aluminum alloy casting piece and the aluminum alloy profile are tightly combined, the riveting strength is high, and the defects of air holes, hot cracks and the like generated by traditional welding are avoided.
Preferably, the aluminum alloy profile consists of the following components in percentage by mass: 8-12%, mg:1.4-3%, sr:0.05-0.5%, mn:0.8-2%, cu:0.1-0.7%, and the balance of Al and unavoidable impurities. Si forms and Mg forms Mg in the aluminum alloy section 2 Si phase, improves the mechanical property of the aluminum profile, and Cu can strengthen the abrasion resistance of the aluminum profile and reduce intergranular corrosion. The aluminum alloy section has better comprehensive performance, but the components contain high-content low-melting-point Mg, mn, si and the like, the components with low melting points are easy to evaporate and burn by adopting the traditional welding, the chemical components of weld metal are changed, the component segregation of the weld zone can generate eutectic segregation to generate grain boundary melting, and the stress effect is achievedThe liquified cracks are formed at the grain boundary, which is extremely unfavorable for products, and the defects can be completely overcome by adopting a riveting process to connect high-content low-melting-point aluminum alloy.
Preferably, the aluminum alloy casting comprises the following components in percentage by mass: 0.2-0.3%, si:1.4-1.6%, mn:0.05-0.2%, cr:0.1-0.5%, zn:0.1-0.4%, ti:0.1-0.2%, sr:0.2-0.3%, and the balance of Al and unavoidable impurities. Similarly, the adopted aluminum alloy castings also contain more low-melting-point components, the welding process is not suitable for being adopted, the expansion coefficient of the aluminum alloy castings of the components is close to that of the aluminum alloy sections, and when the aluminum alloy castings are used in a complex environment of connecting pieces, particularly in a high-temperature environment, the riveting parts cannot be expanded or separated, and good bonding strength can still be maintained.
Preferably, the aluminum alloy section and the aluminum alloy casting are subjected to riveting surface treatment: placing the riveting surface into degreasing solution with the temperature of 40-50 ℃ for degreasing treatment for 1-2 hours, then cleaning with deionized water, and drying at 100-120 ℃.
Further preferably, the degreasing solution comprises the following components in percentage by mass: sodium dodecyl benzene sulfonate: 0.5-1.0%, sodium bicarbonate: 7.5-10%, sodium citrate: 0.5-1.5%, sodium hydroxide: 15-20%, and the balance deionized water. In order to better fuse components in the preparation process of the aluminum alloy part, lubricant and binder substances are generally added, and the additives are easy to burn into cohesive harmful substances in a high-temperature environment and can not be removed timely, so that the use of products is affected.
Preferably, the total thickness of the rivet in the riveting process can reach 1.5-6mm.
Preferably, the pre-pressing pressure in the step S1 is 4000-5000N.
Preferably, the pressure of the power source in step S2 is not lower than 10000N.
The beneficial effects of the invention are as follows:
(1) According to the invention, a welding process is replaced by self-piercing riveting of the semi-hollow rivet, the rivet leg expands to the periphery under the combined action of the shape of the rivet leg and the protrusion of the casting piece, so that a mechanical interlocking structure between the rivet and the aluminum profile is formed, the aluminum alloy casting piece and the aluminum alloy profile are tightly combined, the riveting strength is high, and the defects of air holes, hot cracks and the like generated in traditional welding are avoided.
(2) The riveting process is suitable for connecting the new energy battery box, the frame, the bracket, the end plate, the cell fixing and the like in a connecting mode of the new energy automobile aluminum alloy battery box, the frame, the bracket, the end plate, the cell fixing and the like, and has the advantages of less investment and subsequent operation and maintenance funds compared with laser welding equipment, safe and reliable riveting strength, simple process, convenient operation and high economic benefit.
Drawings
FIG. 1: the invention discloses a riveting process schematic diagram of an aluminum alloy section and an aluminum alloy casting;
fig. 2: the riveting effect of the aluminum alloy section and the aluminum alloy casting is schematically shown;
fig. 3: a specific schematic diagram before riveting of the rivet;
fig. 4: a specific schematic diagram after riveting the rivet;
reference numerals: 1-aluminum alloy castings, 2-aluminum alloy sections and 3-rivets.
Detailed Description
The following are specific examples of the present invention and illustrate the technical scheme of the present invention, but the present invention is not limited to these examples.
Example 1
Placing the riveting surface of the aluminum alloy section and the aluminum alloy die casting into degreasing solution with the temperature of 40 ℃ for degreasing treatment for 1h, then cleaning with deionized water, and drying at the temperature of 100 ℃ for later use; the aluminum alloy profile consists of the following components in percentage by mass: 8%, mg:1.4%, sr:0.05%, mn:0.8%, cu:0.1% of Al and the balance of unavoidable impurities; the aluminum alloy casting comprises the following components in percentage by mass: 0.2%, si:1.4%, mn:0.05%, cr:0.1%, zn:0.1%, ti:0.1%, sr:0.2%, the balance being Al and unavoidable impurities; the degreasing solution comprises the following components in percentage by mass: 0.5 percent of sodium bicarbonate: 7.5%, sodium citrate: 0.5 percent of sodium hydroxide: 15% of deionized water and the balance of deionized water;
fixing the aluminum alloy section subjected to the treatment by using a blank holder, and simultaneously, vertically downwards pre-compacting the aluminum section under 4000N pressure by using a rivet under the driving of a punching hammer;
the power source applies force 10000N to press the rivet downwards to pierce the aluminum profile, and meanwhile, the rivet drives the aluminum profile to plastically deform in the treated aluminum alloy casting; gradually filling the aluminum profile into the casting part along with the riveting;
and when the punch hammer presses the rivet until the rivet head is in close contact with and flush with the upper surface of the aluminum profile, the riveting is completed, the blank holder releases the blank holder force, and the punch hammer returns to the initial station.
Example 2
Placing the riveting surface of the aluminum alloy section and the aluminum alloy die casting into a degreasing solution with the temperature of 42 ℃ for degreasing treatment for 2 hours, then cleaning with deionized water, and drying at 105 ℃ for later use; the aluminum alloy profile consists of the following components in percentage by mass: 9%, mg:1.8%, sr:0.2%, mn:1.2%, cu:0.3% of Al and the balance of unavoidable impurities; the aluminum alloy casting comprises the following components in percentage by mass: 0.23%, si:1.5%, mn:0.1%, cr:0.2%, zn:0.2%, ti:0.15%, sr:0.21%, the balance being Al and unavoidable impurities; the degreasing solution comprises the following components in percentage by mass: 0.6%, sodium bicarbonate: 8%, sodium citrate: 1.0 percent of sodium hydroxide: 16% and the balance of deionized water;
fixing the aluminum alloy section subjected to the treatment by using a blank holder, and simultaneously, vertically downwards pre-compacting the aluminum section under 4500N pressure by using a rivet under the driving of a punching hammer;
the power source forces 11000N to press the rivet to pierce the aluminum profile, and meanwhile, the rivet drives the aluminum profile to plastically deform into the treated aluminum alloy casting;
gradually filling the aluminum profile into the casting part along with the riveting;
and when the punch hammer presses the rivet until the rivet head is in close contact with and flush with the upper surface of the aluminum profile, the riveting is completed, the blank holder releases the blank holder force, and the punch hammer returns to the initial station.
Example 3
Placing the riveting surface of the aluminum alloy section and the aluminum alloy die casting into degreasing solution with the temperature of 45 ℃ for 2 hours, cleaning with deionized water, and drying at 110 ℃ for later use; the aluminum alloy profile consists of the following components in percentage by mass: 10%, mg:2.5%, sr:0.4%, mn:1.5%, cu:0.5% of Al and the balance of unavoidable impurities; the aluminum alloy casting comprises the following components in percentage by mass: 0.25%, si:1.4-1.6%, mn:0.05-0.2%, cr:0.1-0.5%, zn:0.1-0.4%, ti:0.1-0.2%, sr:0.27% of Al and the balance of unavoidable impurities; the degreasing solution comprises the following components in percentage by mass: 0.5-1.0%, sodium bicarbonate: 7.5-10%, sodium citrate: 0.5-1.5%, sodium hydroxide: 15-20%, and the balance deionized water;
fixing the aluminum alloy section subjected to the treatment by using a blank holder, and simultaneously, vertically downwards pre-compacting the aluminum section under 5000N pressure by using a rivet under the driving of a punching hammer;
the power source forces 12000N to press the rivet so as to pierce the aluminum profile, and meanwhile, the rivet drives the aluminum profile to plastically deform into the treated aluminum alloy casting;
gradually filling the aluminum profile into the casting part along with the riveting;
and when the punch hammer presses the rivet until the rivet head is in close contact with and flush with the upper surface of the aluminum profile, the riveting is completed, the blank holder releases the blank holder force, and the punch hammer returns to the initial station.
Example 4
Placing the riveting surface of the aluminum alloy section and the aluminum alloy die casting into degreasing solution with the temperature of 50 ℃ for degreasing treatment for 1h, then cleaning with deionized water, and drying at 120 ℃ for later use; the aluminum alloy profile consists of the following components in percentage by mass: 12%, mg:3%, sr:0.5%, mn:2%, cu:0.7% of Al and the balance of unavoidable impurities; the aluminum alloy casting comprises the following components in percentage by mass: 0.3%, si:1.6%, mn:0.2%, cr:0.5%, zn:0.4%, ti:0.2%, sr:0.3% of Al and the balance of unavoidable impurities; the degreasing solution comprises the following components in percentage by mass: 1.0%, sodium bicarbonate: 10%, sodium citrate: 1.5 percent of sodium hydroxide: 20% of deionized water and the balance of deionized water;
fixing the aluminum alloy section subjected to the treatment by using a blank holder, and simultaneously, vertically downwards pre-compacting the aluminum section under 4800N pressure by using a rivet under the driving of a punching hammer;
the power source applies force 13000N to press the rivet to pierce the aluminum profile, and meanwhile, the rivet drives the aluminum profile to plastically deform into the treated aluminum alloy casting;
gradually filling the aluminum profile into the casting part along with the riveting;
and when the punch hammer presses the rivet until the rivet head is in close contact with and flush with the upper surface of the aluminum profile, the riveting is completed, the blank holder releases the blank holder force, and the punch hammer returns to the initial station.
The riveting process of the invention is also suitable for mixing dissimilar plates, such as steel plates with galvanized layers, organic layers or precoated layers, aluminum steel mixed plates or plastic and metal mixed plates.
The embodiments herein are not exhaustive of the values of points in the technical scope of the invention claimed, and new technical solutions formed by equivalent substitution of single or multiple technical features in the technical solutions of the embodiments are also within the scope of the invention claimed, and all the parameters involved in the solutions of the invention are not mutually and non-replaceable unique combinations unless specifically stated.
While the invention has been described in detail and with reference to specific embodiments thereof, it will be apparent to one skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope thereof.
Claims (4)
1. The semi-hollow rivet riveting process for connecting the aluminum alloy section bar and the aluminum alloy casting is characterized by comprising the following steps of:
s1, treating a surface to be riveted of an aluminum alloy section and an aluminum alloy casting;
s2, fixing the aluminum alloy section with the surface treated by using a blank holder, and simultaneously, vertically downwards pre-compacting the aluminum alloy section by using a rivet under the driving of a punching hammer;
s3, the rivet is pressed downwards under the action of the power source to pierce the aluminum alloy section, and meanwhile, the rivet drives the aluminum alloy section to plastically deform into the aluminum alloy casting;
s4, gradually filling the aluminum alloy section into the aluminum alloy casting along with the riveting;
s5, when the punch hammer presses the rivet until the rivet head is in close contact with and flush with the upper surface of the aluminum alloy section, riveting is completed, the blank holder releases blank holding force, and the punch hammer returns to the initial station;
the aluminum alloy section and aluminum alloy casting riveting surface treatment is as follows: placing the riveting surface into degreasing solution with the temperature of 40-50 ℃ for degreasing treatment for 1-2 hours, then cleaning with deionized water, and drying at 100-120 ℃;
the degreasing solution comprises the following components in percentage by mass: sodium dodecyl benzene sulfonate: 0.5-1.0%, sodium bicarbonate: 7.5-10%, sodium citrate: 0.5-1.5%, sodium hydroxide: 15-20%, and the balance deionized water;
the aluminum alloy profile consists of the following components in percentage by mass: 8-12%, mg:1.4-3%, sr:0.05-0.5%, mn:0.8-2%, cu:0.1-0.7%, the balance of Al and unavoidable impurities;
the aluminum alloy casting comprises the following components in percentage by mass: 0.2-0.3%, si:1.4-1.6%, mn:0.05-0.2%, cr:0.1-0.5%, zn:0.1-0.4%, ti:0.1-0.2%, sr:0.2-0.3%, and the balance of Al and unavoidable impurities.
2. A semi-hollow rivet process according to claim 1, in which the total thickness of the rivet is up to 1.5-6mm.
3. A semi-hollow rivet riveting process according to claim 1 wherein the pre-compaction pressure in step S2 is 4000-5000N.
4. The process according to claim 1, wherein the pressing pressure provided by the power source in the step S3 is not lower than 10000N.
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| CN101890564A (en) * | 2010-07-06 | 2010-11-24 | 上海交通大学 | Special metal resistance rivet welding device |
| US8662141B2 (en) * | 2011-04-06 | 2014-03-04 | GM Global Technology Operations LLC | Fabricated-in-place inserts to receive self-piercing rivets |
| CN103240564B (en) * | 2013-04-26 | 2016-04-13 | 上海交通大学 | Machinery-solid phase composite connecting device and attaching method thereof |
| CN103600201B (en) * | 2013-11-14 | 2016-01-06 | 贵州航天特种车有限责任公司 | A kind of outer cover of van vehicle rivet welding technique |
| US9486957B2 (en) * | 2014-03-21 | 2016-11-08 | Ford Global Technologies, Llc | Assembly and method of pretreating localized areas of parts for joining |
| CN104399859B (en) * | 2014-11-25 | 2016-07-06 | 眉山南车紧固件科技有限公司 | Thin plate self-locking is solidly connected method and system |
| CN109940100A (en) * | 2019-03-21 | 2019-06-28 | 上海交通大学 | A method of inhibiting aluminium alloy self-pierce riveting head crackle |
| CN110319097A (en) * | 2019-06-24 | 2019-10-11 | 上海交通大学 | Interior self-lock rivet, rivet composite connecting device and connection method |
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