CN111659967B - Composite lock welding connecting device and method with ultrasonic brazing effect - Google Patents
Composite lock welding connecting device and method with ultrasonic brazing effect Download PDFInfo
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- CN111659967B CN111659967B CN202010533879.1A CN202010533879A CN111659967B CN 111659967 B CN111659967 B CN 111659967B CN 202010533879 A CN202010533879 A CN 202010533879A CN 111659967 B CN111659967 B CN 111659967B
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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
- B23K1/00—Soldering, e.g. brazing, or unsoldering
- B23K1/06—Soldering, e.g. brazing, or unsoldering making use of vibrations, e.g. supersonic vibrations
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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
- B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
- B21D22/02—Stamping using rigid devices or tools
-
- 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
- B23K3/00—Tools, devices, or special appurtenances for soldering, e.g. brazing, or unsoldering, not specially adapted for particular methods
- B23K3/04—Heating appliances
-
- 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
- B23K3/00—Tools, devices, or special appurtenances for soldering, e.g. brazing, or unsoldering, not specially adapted for particular methods
- B23K3/08—Auxiliary devices therefor
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- Pressure Welding/Diffusion-Bonding (AREA)
Abstract
The invention provides a composite lock welding connecting device and a composite lock welding connecting method with ultrasonic brazing effect, wherein the composite lock welding connecting device comprises the following steps: the electric spark heating circuit comprises an alternating current power supply, a switch, an adjustable resistor, an electric spark anode and an electric spark cathode; the ultrasonic brazing device comprises an ultrasonic brazing device body, wherein a base is arranged at the lower end of the ultrasonic brazing device body, a stamping device is arranged on the base and connected with an electric spark anode, a controller is arranged at the top end of the stamping device, the first end of the controller is electrically connected with an alternating current power supply, and the second end of the controller is electrically connected with an ultrasonic generator. The invention adopts a double heating method of electric spark heating and ultrasonic vibration friction heating, has high heating efficiency, can control the heating temperature through an adjustable resistor and ultrasonic frequency, is simple and convenient, and has accurate temperature control; the plastic deformation capacity of the metal plate is improved, the strength and the reliability of the connecting joint are improved, and the high-strength alloy can be used for connecting high-strength alloys such as titanium alloy, magnesium alloy, aluminum alloy and the like.
Description
Technical Field
The invention relates to the field of ultrasonic brazing, in particular to a composite lock welding connecting device and method with an ultrasonic brazing effect.
Background
With the development of industry and technology, different materials are often required to be connected to meet the production requirements, and the conventional welding technology is difficult to realize reliable connection between different materials. Ultrasonic brazing is a new welding method for realizing the same or different metals, semiconductors, plastics, metals/non-metals and the like by utilizing the mechanical vibration energy and static pressure of ultrasonic frequency.
The acoustic cavitation and acoustic vortex effect generated when the ultrasonic wave is transmitted in the liquid can generate local high temperature and high pressure in the liquid and generate shock waves. In the brazing process, ultrasonic waves are applied to the surface of a base material to be very beneficial to removing an oxide film on the surface of the base material, promoting diffusion of atoms of a connecting interface, dissolving substances, wetting the surface of the base material by brazing filler metal, chemical reaction between the brazing filler metal and the base material and the like, and the ultrasonic brazing is widely applied to the aerospace fields of manufacturing and repairing of turbine blades, assembly of pressure, temperature and speed sensors, manufacturing of aluminum and steel heat exchangers, manufacturing of old airplane hydraulic pipelines, connecting of spacecraft solar panels and the like as a novel solid-state connecting method.
The application of ultrasonic waves in brazing can be used for brazing dissimilar materials and materials difficult to wet without brazing flux in the atmosphere, after the brazing is completed, the brazing flux does not need to be cleaned, so that the time is saved, the cost is reduced, the harm to operators caused by evaporation of toxic gas in the brazing flux is avoided, the effect of refining grains can be achieved, and the comprehensive mechanical property of a joint is improved; the ultrasonic brazing is interface combination and is used for connecting different materials, when different brazing materials are used, the base materials and the brazing materials have different thermal expansion coefficients, and after brazing, larger residual stress can be generated, the static strength and fatigue strength of connection are influenced, and even welding seams are cracked; when the brazing temperature is too high and the heat preservation time is too long, brazing filler metal can be lost, the joint bonding rate is reduced, and the formed connection is unreliable. Accordingly, there is a need for an ultrasonic brazing apparatus that improves the strength and reliability of the joined joints.
Disclosure of Invention
The invention provides a composite lock welding connecting device and a composite lock welding connecting method with ultrasonic brazing effect, and aims to improve the strength and the reliability of a connecting joint.
In order to achieve the above object, the present invention provides a composite lock-weld connecting device with ultrasonic brazing, comprising:
the electric spark heating circuit comprises an alternating current power supply, a switch, an adjustable resistor, an electric spark anode and an electric spark cathode, wherein the electric spark anode and the electric spark cathode are respectively connected to two ends of the alternating current power supply;
the lower end of the ultrasonic brazing device is provided with a base, an inner pressing edge ring and an outer pressing edge ring are arranged on the upper portion of the base, an annular through hole is formed between the outer pressing edge ring and the inner pressing edge ring, the outer pressing edge ring is connected with the electric spark cathode, the lower portion of the base is a lower die, and an upper metal plate and a lower metal plate are placed between the lower die and the inner pressing edge ring and between the lower die and the outer pressing edge ring;
the base is provided with a stamping device, the stamping device is connected with the electric spark anode, the top end of the stamping device is provided with a controller, the first end of the controller is electrically connected with the alternating current power supply, and the second end of the controller is electrically connected with an ultrasonic generator.
Preferably, the stamping device comprises an ultrasonic die, an ultrasonic horn and an ultrasonic transducer.
Preferably, the ultrasonic die is connected with the electric spark anode, the lower part of the ultrasonic die is a cylinder with a blind hole in the center, and the ultrasonic die is arranged in an annular through hole formed between the outer pressing edge ring and the inner pressing edge ring in a penetrating mode through the lower part of the ultrasonic die.
Preferably, an inner spring is arranged above the inner pressing edge ring, and the ultrasonic die applies pressure to the inner pressing edge ring through the inner spring.
Preferably, the ultrasonic horn is fixed above the ultrasonic die.
Preferably, the ultrasonic transducer is fixed above the ultrasonic horn, the outer end of the ultrasonic transducer is sleeved with an upper die, the controller is arranged at the upper end of the ultrasonic transducer, and the ultrasonic transducer is electrically connected with the ultrasonic generator.
Preferably, an outer spring is further arranged above the outer pressing edge ring, and the upper die applies pressure to the outer pressing edge ring through the outer spring.
Correspondingly, the invention also provides a composite lock welding connection method with the ultrasonic brazing effect, which comprises the following steps:
the method comprises the following steps that firstly, a controller controls an electric spark heating loop switch to be closed, an ultrasonic generator is electrified, an ultrasonic transducer converts high-frequency electric energy into mechanical energy, and the amplitude is enhanced through an ultrasonic amplitude transformer, so that an ultrasonic die connected with the ultrasonic amplitude transformer can generate ultrasonic vibration on a workpiece;
step two, the controller controls the upper die to drive the stamping device to descend, the ultrasonic die is contacted with the upper metal plate, and an electric spark heating circuit consisting of an outer pressing edge ring, an electric spark cathode, a switch, an alternating current power supply, an adjustable resistor, an electric spark anode and the ultrasonic die is communicated; the ultrasonic wave die generates ultrasonic vibration on the workpiece to drive the electric spark anode to vibrate together and frequently contact and separate with the upper metal plate, the whole electric spark heating circuit is frequently switched on and off to generate spark discharge and generate local high temperature to heat the upper metal plate; the brazing filler metal is melted under the double heating action of ultrasonic vibration and electric sparks, the ultrasonic wave promotes the upper metal plate and the lower metal plate to generate chemical reaction and element diffusion, the joint tissue is refined, the joint thermal residual stress is reduced, and good interface combination is formed at the joint; the ultrasonic die applies pressure to the inner pressing edge ring through the inner spring, the upper die applies pressure to the outer pressing edge ring through the outer spring, the pressure on the inner pressing edge ring and the pressure on the outer pressing edge ring are used for pressing the plate, the plate is stamped by the ultrasonic die, the upper metal plate and the lower metal plate are bent and extruded under the action of the ultrasonic die, and plastic deformation occurs locally; the ultrasonic mold continues to descend, and the upper metal plate and the lower metal plate are restrained by the lower mold and the blank holder and move upwards along the blind hole and the excircle side of the ultrasonic mold; the upper metal plate and the lower metal plate form an inner ring mechanical lock under the action of the blind holes of the ultrasonic die; the upper metal plate and the lower metal plate form an outer ring mechanical lock under the action of the excircle side of the ultrasonic mold;
step three, after the pressure between the ultrasonic die and the upper metal plate reaches the preset force set by the controller, the electric spark circuit switch is disconnected, the ultrasonic generator is powered off, and the ultrasonic brazing device returns to the initial working position; and cooling the upper metal plate and the lower metal plate to obtain the brazed joint with the inner ring and the outer ring mechanically locked.
The scheme of the invention has the following beneficial effects:
1. the double heating method of electric spark heating and ultrasonic vibration friction heating is adopted, the heating efficiency is high, the heating temperature can be controlled through an adjustable resistor and ultrasonic frequency, the operation is simple and convenient, and the temperature control is accurate;
2. the joint is formed at one time, extra processing is not needed, the production cost and space are saved, the processing period is short, and the connection efficiency is high;
3. the plastic deformation capability of the metal plate is improved, the composite lock welding is formed, the stress corrosion and the residual stress are reduced, the strength and the reliability of the connecting joint are improved, and the composite lock welding joint can be used for connecting various high-strength alloys such as titanium alloy, magnesium alloy, aluminum alloy and the like.
Drawings
FIG. 1 is an overview of the apparatus of the present invention;
FIG. 2 is a view of the positioning of the device of the present invention;
FIG. 3 is a diagram of the apparatus of the present invention;
FIG. 4 is a two-dimensional cross-sectional view of a fitting of the present invention;
fig. 5 is a three-dimensional view of a joint of the present invention.
1-brazing filler metal; 2-pressing the edge ring; 3-an internal spring; 4-an electric spark cathode; 5-a switch; 6-alternating current power supply; 7-adjustable resistance; 8-electric spark anode; 9-a controller; 10-an ultrasonic generator; 11-ultrasonic transducer; 12-upper mould; 13-an ultrasonic horn; 14-an outer spring; 15-ultrasonic wave mould; 16-pressing the edge ring externally; 17-upper metal plate; 18-lower metal plate; 19-lower die; 20-outer ring mechanical lock; 21-inner ring mechanical lock; 22-brazed joint.
Detailed Description
In order to make the technical problems, technical solutions and advantages of the present invention more apparent, the following detailed description is given with reference to the accompanying drawings and specific embodiments.
The invention provides a composite lock welding connecting device with ultrasonic brazing effect, aiming at the existing problems, comprising:
the electric spark heating circuit comprises an alternating current power supply 6, a switch 5, an adjustable resistor 7, an electric spark anode 8 and an electric spark cathode 4, wherein the electric spark anode 8 and the electric spark cathode 4 are respectively connected to two ends of the alternating current power supply 6; the ultrasonic brazing device comprises a base, wherein a base is arranged at the lower end of the ultrasonic brazing device, an outer pressing edge ring 16 and an inner pressing edge ring 2 are arranged on the upper portion of the base, an annular through hole is formed between the outer pressing edge ring 16 and the inner pressing edge ring 2, the outer pressing edge ring 16 is connected with an electric spark cathode 4, the lower portion of the base is a lower die 19, and an upper metal plate 17 and a lower metal plate 18 are arranged among the lower die 19, the inner pressing edge ring 2 and the outer pressing edge ring 16; the base is provided with a stamping device, the stamping device is connected with an electric spark anode 8, the top end of the stamping device is provided with a controller 9, the first end of the controller 9 is electrically connected with an alternating current power supply 6, and the second end of the controller 9 is electrically connected with an ultrasonic generator 10.
The device adopts a double heating method of electric spark heating and ultrasonic vibration friction heating, the heating efficiency is higher, the heating temperature can be controlled by an alternating current power supply and the ultrasonic frequency of an ultrasonic generator, the operation is simple and convenient, and the temperature control is accurate; the adjustable resistor is arranged on the anode of the electric spark, so that the heating temperature of the alternating current power supply is conveniently controlled, and the accurate control of the temperature is realized.
Preferably, the punching device comprises an ultrasonic die 15, an ultrasonic horn 13 and an ultrasonic transducer 11; the ultrasonic die 15 is connected with the electric spark anode 8, the lower part of the ultrasonic die is a cylinder with a blind hole in the center, and the ultrasonic die 15 is arranged in an annular through hole formed between the outer pressing edge ring 16 and the inner pressing edge ring 2 in a penetrating mode through the cylinder with the blind hole in the lower part; an inner spring 3 is arranged above the inner pressing edge ring 2, and the ultrasonic die 15 applies pressure to the inner pressing edge ring 2 through the inner spring 3; the ultrasonic amplitude transformer 13 is fixed above the ultrasonic mould 15, the ultrasonic transducer 11 is fixed above the ultrasonic amplitude transformer 13, the outer end of the ultrasonic transducer 11 is sleeved with an upper mould 12, the controller 9 is arranged at the upper end of the ultrasonic transducer 11, and the ultrasonic transducer 11 is electrically connected with the ultrasonic generator 10; an outer spring 14 is arranged above the outer pressing edge ring 16, and the upper die 12 applies pressure to the outer pressing edge ring 16 through the outer spring 14.
The ultrasonic converter in the punching device can convert the ultrasonic frequency emitted by the ultrasonic generator into corresponding mechanical energy, and then the corresponding mechanical energy is enhanced by the ultrasonic amplitude transformer and is transmitted to the ultrasonic die, the ultrasonic die generates ultrasonic vibration on a workpiece to carry out ultrasonic brazing and punching, the plastic deformation capacity of the plate is rapidly increased, so that interface combination is formed between the plate and the metal plate, a combined lock welding structure with an internal mechanical lock and an external mechanical lock is formed under the action of a special ultrasonic die, the stress corrosion and the residual stress are reduced, and the strength and the reliability of a connecting joint are improved.
As shown in fig. 1 and 2, the invention provides a specific implementation process of a composite lock-welding connecting device with ultrasonic brazing effect: the controller 9 is used for controlling the electric spark heating loop switch 5 to be closed, the ultrasonic generator 10 is controlled to be electrified, the ultrasonic transducer 11 is used for converting high-frequency electric energy into mechanical energy, and the amplitude is enhanced through the ultrasonic amplitude transformer 13, so that the ultrasonic die 15 connected with the ultrasonic amplitude transformer 14 generates ultrasonic vibration on a workpiece; meanwhile, the controller 9 controls the upper die 12 to drive the punching device to descend, when the ultrasonic die 15 is in contact with the upper metal plate 17, an electric spark heating circuit consisting of an external pressing edge ring 16, an electric spark cathode 4, a switch 5, an alternating current power supply 6, an adjustable resistor 7, an electric spark anode 8 and the ultrasonic die 15 is communicated, the ultrasonic die 15 generates ultrasonic vibration on a workpiece to drive the electric spark anode 8 to vibrate together and frequently contact and separate with the upper metal plate 17, so that the whole electric spark heating circuit is frequently switched on and off to generate spark discharge, the plastic deformation capacity of the upper metal plate 17 and the lower metal plate 18 is enhanced, local high temperature is generated, the upper metal plate 17 is heated, the brazing filler metal 1 is melted, an oxide film at the brazing interface of the upper metal plate 17 and the lower metal plate 18 is removed through the ultrasonic vibration effect of the ultrasonic die 15, and element diffusion and chemical reaction occur between the brazing filler metal 1 and the upper metal plate 17 and, forming an interfacial bond at the joint; the ultrasonic die 15 applies pressure to the inner pressing edge ring 2 through the inner spring 3, the upper die 12 applies pressure to the outer pressing edge ring 16 through the outer spring 14, and the pressure on the inner pressing edge ring 2 and the outer pressing edge ring 16 mainly acts on compressing an upper metal plate 17 and a lower metal plate 18;
as shown in fig. 3, 4 and 5, the ultrasonic die 15 punches the upper metal plate 17 and the lower metal plate 18, and the upper metal plate 17 and the lower metal plate 18 are bent and pressed by the ultrasonic die 15 to be locally plastically deformed; the ultrasonic mold 15 continues to move downwards, and the upper metal plate 17 and the lower metal plate 18 are restrained by the lower mold 19, the inner pressing edge ring 2 and the outer pressing edge ring 16 and move upwards along the blind hole and the excircle side of the ultrasonic mold 15; the upper and lower metal plates 17, 18 form an outer ring mechanical lock 20 under the action of the excircle side of the ultrasonic mold 15; the upper and lower metal plates 17, 18 form an inner ring mechanical lock 21 under the action of the blind holes of the ultrasonic die 15;
when the pressure between the ultrasonic die 15 and the upper metal plate 17 reaches the preset force set by the controller 9, the electric spark circuit switch 5 is switched off, the ultrasonic generator 10 is powered off, the ultrasonic brazing device returns to the initial working position, and the upper metal plate 17 and the lower metal plate 18 are cooled to obtain the brazed joint 22 with the outer ring mechanical lock 20 and the inner ring mechanical lock 21.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (6)
1. A composite lock-weld connection device for ultrasonic brazing, comprising:
the electric spark heating circuit comprises an alternating current power supply, a switch, an adjustable resistor, an electric spark anode and an electric spark cathode, wherein the electric spark anode and the electric spark cathode are respectively connected to two ends of the alternating current power supply;
the lower end of the ultrasonic brazing device is provided with a base, an inner pressing edge ring and an outer pressing edge ring are arranged on the upper portion of the base, an annular through hole is formed between the outer pressing edge ring and the inner pressing edge ring, the outer pressing edge ring is connected with the electric spark cathode, the lower portion of the base is a lower die, and an upper metal plate and a lower metal plate are placed between the lower die and the inner pressing edge ring and between the lower die and the outer pressing edge ring;
the base is provided with a stamping device, the stamping device is connected with the electric spark anode, the top end of the stamping device is provided with a controller, the first end of the controller is electrically connected with the alternating current power supply, and the second end of the controller is electrically connected with an ultrasonic generator;
the stamping device comprises an ultrasonic die, an ultrasonic amplitude transformer and an ultrasonic transducer;
the ultrasonic die is connected with the electric spark anode, the lower part of the ultrasonic die is a cylinder with a blind hole in the center, and the ultrasonic die is arranged in an annular through hole formed between the outer pressing edge ring and the inner pressing edge ring in a penetrating mode through the lower part of the ultrasonic die.
2. The ultrasonic brazing composite lock-weld connection device as claimed in claim 1, wherein an inner spring is disposed above the inner pressing edge ring, and the ultrasonic mold applies pressure to the inner pressing edge ring through the inner spring.
3. The ultrasonic brazing composite lockweld attachment device of claim 1, wherein the ultrasonic horn is fixed above the ultrasonic die.
4. The ultrasonic brazing combined lock welding connection device as claimed in claim 1, wherein the ultrasonic transducer is fixed above the ultrasonic horn, an upper die is sleeved at the outer end of the ultrasonic transducer, the controller is arranged at the upper end of the ultrasonic transducer, and the ultrasonic transducer is electrically connected with the ultrasonic generator.
5. The ultrasonic brazing composite lock welding connection device as claimed in claim 4, wherein an outer spring is further disposed above the outer pressing edge ring, and the upper mold applies pressure to the outer pressing edge ring through the outer spring.
6. A method of joining ultrasonically brazed composite clinch-on connections as claimed in any one of claims 1 to 5, comprising the steps of:
the method comprises the following steps that firstly, a controller controls an electric spark heating loop switch to be closed, an ultrasonic generator is electrified, an ultrasonic transducer converts high-frequency electric energy into mechanical energy, and the amplitude is enhanced through an ultrasonic amplitude transformer, so that an ultrasonic die connected with the ultrasonic amplitude transformer can generate ultrasonic vibration on a workpiece;
step two, the controller controls the upper die to drive the stamping device to descend, the ultrasonic die is contacted with the upper metal plate, and an electric spark heating circuit consisting of an outer pressing edge ring, an electric spark cathode, a switch, an alternating current power supply, an adjustable resistor, an electric spark anode and the ultrasonic die is communicated; the ultrasonic wave die generates ultrasonic vibration on the workpiece to drive the electric spark anode to vibrate together and frequently contact and separate with the upper metal plate, the whole electric spark heating circuit is frequently switched on and off to generate spark discharge and generate local high temperature to heat the upper metal plate; the brazing filler metal is melted under the double heating action of ultrasonic vibration and electric sparks, the ultrasonic wave promotes the upper metal plate and the lower metal plate to generate chemical reaction and element diffusion, the joint tissue is refined, the joint thermal residual stress is reduced, and good interface combination is formed at the joint; the ultrasonic die applies pressure to the inner pressing edge ring through the inner spring, the upper die applies pressure to the outer pressing edge ring through the outer spring, the pressure on the inner pressing edge ring and the pressure on the outer pressing edge ring are used for pressing the plate, the plate is stamped by the ultrasonic die, the upper metal plate and the lower metal plate are bent and extruded under the action of the ultrasonic die, and plastic deformation occurs locally; the ultrasonic mold continues to descend, and the upper metal plate and the lower metal plate are restrained by the lower mold and the blank holder and move upwards along the blind hole and the excircle side of the ultrasonic mold; the upper metal plate and the lower metal plate form an inner ring mechanical lock under the action of the blind holes of the ultrasonic die; the upper metal plate and the lower metal plate form an outer ring mechanical lock under the action of the excircle side of the ultrasonic mold;
step three, after the pressure between the ultrasonic die and the upper metal plate reaches the preset force set by the controller, the electric spark circuit switch is disconnected, the ultrasonic generator is powered off, and the ultrasonic brazing device returns to the initial working position; and cooling the upper metal plate and the lower metal plate to obtain the brazed joint with the inner ring and the outer ring mechanically locked.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010533879.1A CN111659967B (en) | 2020-06-12 | 2020-06-12 | Composite lock welding connecting device and method with ultrasonic brazing effect |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010533879.1A CN111659967B (en) | 2020-06-12 | 2020-06-12 | Composite lock welding connecting device and method with ultrasonic brazing effect |
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| Publication Number | Publication Date |
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| CN111659967A CN111659967A (en) | 2020-09-15 |
| CN111659967B true CN111659967B (en) | 2021-05-14 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US7698797B2 (en) * | 2005-02-02 | 2010-04-20 | Ford Global Technologies | Apparatus and method for forming a joint between adjacent members |
| CN101474699B (en) * | 2009-01-19 | 2010-10-27 | 哈尔滨工业大学 | Ultrasonic soldering method of aluminum or aluminum alloy |
| CN102260088A (en) * | 2011-06-28 | 2011-11-30 | 哈尔滨工业大学 | Low-stress low-temperature ceramic brazing method |
| CN105916612B (en) * | 2014-01-16 | 2019-03-08 | 亨罗布有限公司 | Linear actuator assemblies |
| CN109821992B (en) * | 2019-04-11 | 2024-04-16 | 吉林大学 | Rivet-free riveting forming device under ultrasonic wave and high temperature effects and control method |
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