CN108372356B - Crushing method for aluminum alloy surface oxide film - Google Patents
Crushing method for aluminum alloy surface oxide film Download PDFInfo
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- CN108372356B CN108372356B CN201611191897.6A CN201611191897A CN108372356B CN 108372356 B CN108372356 B CN 108372356B CN 201611191897 A CN201611191897 A CN 201611191897A CN 108372356 B CN108372356 B CN 108372356B
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- aluminum alloy
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K20/00—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating
- B23K20/02—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating by means of a press ; Diffusion bonding
- B23K20/023—Thermo-compression bonding
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D26/00—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces
- B21D26/14—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces applying magnetic forces
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Manufacturing Cores, Coils, And Magnets (AREA)
- Hard Magnetic Materials (AREA)
- Pressure Welding/Diffusion-Bonding (AREA)
Abstract
The invention discloses a method for crushing an oxide film on the surface of an aluminum alloy, which comprises the steps of surface treatment, coating of a solder stopping agent, vacuumizing and sealing welding, heating up, magnet discharging, moving of a magnet point by point along a preset route to complete the whole selected area and the like. According to the technical scheme, huge pulse electromagnetic force generated by a pulse strong magnetic field is utilized to act on the surface of the aluminum alloy, so that the aluminum alloy is deformed to a certain extent, a compact oxide film on the surface of the aluminum alloy is crushed, and diffusion connection of the aluminum alloy is realized on the basis of the crushing; in addition, because the aluminum alloy sample is arranged on a platform capable of moving in space, the selectable area treatment is realized by using a point-by-point moving method of the magnet, and a new technical approach is provided for solving the problems of high-quality connection and processing of the aluminum alloy.
Description
Technical Field
The invention relates to an electromagnetic forming technology, in particular to a method for crushing an oxide film on the surface of an aluminum alloy.
Background
The aluminum alloy has the advantages of low density, high specific strength, high specific rigidity, good corrosion resistance, high fatigue resistance and the like, and is one of light alloy materials widely applied in the field of aerospace.
However, the surface of the aluminum alloy is easy to form a compact oxide film, and even after the surface is removed by mechanical and chemical methods, the surface can be oxidized again to form the oxide film if exposed in the air. The existence of the oxide film can generate great influence on diffusion connection, brazing, fusion welding and the like of the aluminum alloy, reduce the welding quality and even can not be connected.
For example, a multilayer hollow structure prepared by using a superplastic forming/diffusion bonding technology (SPF/DB) has the characteristics of good integrity, reduced number of connecting pieces and reduced overall weight, is widely applied to the aerospace field, and is particularly suitable for titanium alloys. However, the multilayer hollow structure of the aluminum alloy is not widely applied, because the diffusion bonding technology of the aluminum alloy is not well solved so far, the main reason is that a layer of compact and stable oxide film is easily formed on the surface of the aluminum alloy at room temperature, and the oxide film is not decomposed or dissolved in a matrix in the diffusion bonding process, so that the mutual diffusion of aluminum atoms is seriously hindered, and a diffusion bonding interface cannot be formed.
Electromagnetic Forming (EMF) is a high energy rate, high speed special processing method that utilizes the Magnetic field force generated by passing current through a coil to make a metal blank generate plasticity, and is also called Magnetic pulse Forming. The electromagnetic forming has the advantages of high production efficiency, good forming performance, simple equipment, easy operation, no mechanical contact and the like, and is suitable for bulging, reducing, punching, flanging and connecting of pipes, forming, punching, impressing or embossing, bending and the like of plates. Electromagnetic forming is widely applied in the fields of automobile industry, machinery, electronics, instruments and meters, aerospace, weapon industry and the like.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, provides a method for destroying an oxide film on the surface of an aluminum alloy, and provides a way for realizing high-quality connection and processing of the aluminum alloy.
In order to solve the technical problem, the invention provides a method for crushing an oxide film on the surface of an aluminum alloy, which is characterized by comprising the following steps of:
carrying out surface treatment on the aluminum alloy sample;
coating a layer of plastic film on the area needing to be processed on the surface of the sample by using a cold-mounting film laminating machine and a laser engraving machine, protecting the area needing to be processed on the surface of the sample, coating a layer of welding stopping agent on the area needing not to be processed on the surface of the sample and the area of a vacuumizing air channel by using a brushing method, and tearing off the plastic film on the area needing to be processed after the welding stopping agent is dried;
the two processed samples are oppositely stacked together, the periphery is sealed and welded by argon arc welding, and a vacuum-pumping pipeline is welded at the position of an air passage;
installing a sample on an electric heating platform of a press, vacuumizing the sample by adopting a vacuum pump through an air passage pipeline, and then turning on an electric heating power supply to heat the sample to 400-600 ℃;
controlling a magnet moving platform to move a magnet to a welding seam position, and controlling an upper platform of a press machine to descend so that the magnet moves to a position above a to-be-processed position of a sample, wherein the distance between the magnet and the surface of the sample is 1-5 mm;
controlling a magnetic pulse power supply to charge to 3-15 KV, then discharging a coil, and continuously charging and discharging for 3-10 times;
and controlling the upper platform of the press machine to ascend, controlling the magnet moving platform to move the magnet to the next position along a set track, controlling the upper platform of the press machine to descend, controlling the magnetic pulse power supply to discharge electricity to the magnet, and repeating the steps until the whole selected area is processed.
Preferably, the magnet is a solenoid coil or a grading coil.
Preferably, the aluminum alloy sample surface treatment step comprises grinding, polishing and acetone cleaning.
Preferably, after the surface discharge of the aluminum alloy sample is completed, the power supply is turned off, and the aluminum alloy is cooled to room temperature.
Preferably, the magnet is placed 2mm from the sample surface before discharging the coil.
Preferably, the magnetic pulse power supply is charged to 12KV before discharging.
After the technical scheme is adopted, the huge pulse electromagnetic force generated by the pulse strong magnetic field is utilized to act on the surface of the aluminum alloy, so that the aluminum alloy is deformed to a certain extent, a compact oxide film on the surface of the aluminum alloy is crushed, and the diffusion connection of the aluminum alloy is realized based on the crushing. In addition, because the aluminum alloy sample is arranged on a platform capable of moving in space, the selectable area treatment is realized by using a point-by-point moving method of the magnet, and a new technical approach is provided for solving the problems of high-quality connection and processing of the aluminum alloy.
Drawings
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
FIG. 1 is a schematic diagram of an apparatus according to an embodiment of the present invention.
FIG. 2 is a view of one embodiment of the invention of a defluxing coated area.
Fig. 3 is a schematic diagram of a movement track of a magnet according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments. The following description is only for the purpose of explanation and is not intended to limit the invention.
The technical scheme is that the oxide film in the local selective area on the surface of the aluminum alloy plate is crushed by using a pulse high-intensity magnetic field. As shown in fig. 1, 2, 3, the related equipment may include a hydraulic press, a magnetic pulse power supply, a magnet moving device, a magnet 6, an electric heating power supply, and the like. The magnet 6 can be a solenoid coil or a pressure equalizing coil and is arranged on a magnet moving device which can be a two-dimensional moving platform 3 controlled by a numerical control system, the magnet moving device is arranged on an upper platform 2 of the hydraulic press, the upper platform 2 is driven by a hydraulic cylinder 1, and a sample can be arranged on a lower platform 5. The magnetic pulse power supply discharges by a magnet, and the electric heating power supply heats the workpiece.
The sample size is 150X310mm, the magnetic pulse power supply is 32uF, the voltage is 12KV, the coil uniform pressure coil is 90X100X30 mm. The implementation process is as follows:
and (3) carrying out surface treatment on the surface of the aluminum alloy sample 4 through steps of grinding, polishing, acetone cleaning and the like.
And coating a layer of plastic film on the area needing to be processed on the surface of the sample 4 by adopting a cold-mounting film laminating machine and a laser engraving machine, coating a layer of solder stopping agent on the area needing not to be processed on the surface of the sample 4 and the area of a vacuumizing air channel by adopting a brushing method, and tearing off the plastic film on the area needing to be processed after the solder stopping agent is dried. The solder resist coating area on the surface of the test piece 4 is shown in fig. 2, for example, the coating area 9 is coated, and the solder resist area 8 includes an area not requiring treatment and the vacuum channel area 9.
And (3) relatively stacking the two processed samples 4 together, sealing and welding the periphery by using argon arc welding, and welding a vacuumizing pipeline at the position of an air passage.
The sample 4 is arranged on an electric heating platform 11 on a lower platform 5 of the press, and the sample 4 is vacuumized to 10 by a vacuum pump-2Pa and then the electric heating power supply was turned on to heat the sample 4 to 520 ℃.
And controlling the magnet moving platform to move the magnet 6 to the welding seam position, and controlling the upper platform 2 of the press machine to descend so that the magnet 6 moves to the position above the sample to be processed, wherein the distance between the magnet and the surface of the sample 4 is 2 mm.
And controlling the magnetic pulse power supply to charge to 12KV, then discharging the coil, and continuously charging and discharging for 5 times.
Controlling the upper platform 2 of the press machine to ascend, controlling the magnet moving platform to move the magnet to the next position along a set track, controlling the upper platform 2 of the press machine to descend, controlling the magnetic pulse power supply to discharge electricity to the magnet, and repeating the steps until the whole selected area is processed, wherein the moving track of the magnet is shown in figure 3.
And turning off the power supply, cooling to room temperature, and taking out the sample 4.
The above description is only a preferred embodiment of the present invention and should not be construed as limiting the present invention, and any modifications, improvements and equivalents made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (5)
1. A method for crushing an oxide film on the surface of an aluminum alloy is characterized by comprising the following steps:
carrying out surface treatment on the aluminum alloy sample;
coating a layer of plastic film on the area needing to be processed on the surface of the sample by using a cold-mounting film laminating machine and a laser engraving machine, protecting the area needing to be processed on the surface of the sample, coating a layer of welding stopping agent on the area needing not to be processed on the surface of the sample and the area of a vacuumizing air channel by using a brushing method, and tearing off the plastic film on the area needing to be processed after the welding stopping agent is dried;
the two processed samples are oppositely stacked together, the periphery is sealed and welded by argon arc welding, and a vacuum-pumping pipeline is welded at the position of an air passage;
installing the sample on an electric heating platform on a press, vacuumizing the sample by adopting a vacuum pump through an air passage pipeline, and then opening an electric heating power supply to heat the sample to 400-600 ℃;
controlling a magnet moving platform to move a magnet to a welding seam position, and controlling an upper platform of a press machine to descend so that the magnet moves to a position above a to-be-processed position of a sample, wherein the distance between the magnet and the surface of the sample is 1-5 mm;
controlling a magnetic pulse power supply to charge to 3-15 KV, then discharging the magnet, and continuously charging and discharging for 3-10 times;
controlling the upper platform of the press machine to ascend, controlling the magnet moving platform to move the magnet to the next position along a set track, then controlling the upper platform of the press machine to descend, and then controlling the magnetic pulse power supply to discharge electricity to the magnet, and repeating the steps until the whole selected area is processed;
and after the surface discharge of the aluminum alloy sample is finished, turning off a power supply, and cooling the aluminum alloy to room temperature.
2. The method for breaking an oxide film on the surface of an aluminum alloy according to claim 1, wherein: the magnet is a solenoid coil or a grading coil.
3. The method for breaking an oxide film on the surface of an aluminum alloy according to claim 1, wherein: the aluminum alloy sample surface treatment step comprises grinding, polishing and acetone cleaning.
4. The method for crushing an oxide film on the surface of an aluminum alloy according to any one of claims 1 to 3, wherein: the magnet was placed 2mm from the sample surface before discharging the coil.
5. The method for crushing an oxide film on the surface of an aluminum alloy according to any one of claims 1 to 3, wherein: and the magnetic pulse power supply is charged to 12KV before discharging.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611191897.6A CN108372356B (en) | 2016-12-21 | 2016-12-21 | Crushing method for aluminum alloy surface oxide film |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611191897.6A CN108372356B (en) | 2016-12-21 | 2016-12-21 | Crushing method for aluminum alloy surface oxide film |
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| CN108372356A CN108372356A (en) | 2018-08-07 |
| CN108372356B true CN108372356B (en) | 2020-09-08 |
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| CN111299820B (en) * | 2020-03-12 | 2021-09-10 | 中国航空制造技术研究院 | Reflection type laser shock peening head |
| CN114273769B (en) * | 2021-12-30 | 2023-08-08 | 华瞬(深圳)智能装备有限公司 | Welding device for power battery strap of new energy automobile |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101029703A (en) * | 2006-02-27 | 2007-09-05 | 韩华 | Titanium-alloy special section and its production |
| CN101605626A (en) * | 2006-12-18 | 2009-12-16 | Gm全球科技运作股份有限公司 | The method and apparatus that is used for the magnetic pulse welding of sheet has the sheet of at least one adhering zone that tilts at a certain angle with respect to plate plane; Parts with vehicle sections of adhering zone like this |
| CN104014923A (en) * | 2014-06-11 | 2014-09-03 | 中国航空工业集团公司北京航空制造工程研究所 | Aluminum alloy diffusion bonding method |
| CN105873693A (en) * | 2013-12-31 | 2016-08-17 | Adm28责任有限公司 | Method for attaching a metal ring in a frame and induction coil obtained by said method |
| CN106181016A (en) * | 2016-07-29 | 2016-12-07 | 西安交通大学 | The electromagnetic pulse of bimetallic stratiform composite board soldering joint drives welding system and method |
-
2016
- 2016-12-21 CN CN201611191897.6A patent/CN108372356B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101029703A (en) * | 2006-02-27 | 2007-09-05 | 韩华 | Titanium-alloy special section and its production |
| CN101605626A (en) * | 2006-12-18 | 2009-12-16 | Gm全球科技运作股份有限公司 | The method and apparatus that is used for the magnetic pulse welding of sheet has the sheet of at least one adhering zone that tilts at a certain angle with respect to plate plane; Parts with vehicle sections of adhering zone like this |
| CN105873693A (en) * | 2013-12-31 | 2016-08-17 | Adm28责任有限公司 | Method for attaching a metal ring in a frame and induction coil obtained by said method |
| CN104014923A (en) * | 2014-06-11 | 2014-09-03 | 中国航空工业集团公司北京航空制造工程研究所 | Aluminum alloy diffusion bonding method |
| CN106181016A (en) * | 2016-07-29 | 2016-12-07 | 西安交通大学 | The electromagnetic pulse of bimetallic stratiform composite board soldering joint drives welding system and method |
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| CN108372356A (en) | 2018-08-07 |
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