CN108838575B - Dissimilar metal plate welding device and method - Google Patents
Dissimilar metal plate welding device and method Download PDFInfo
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- CN108838575B CN108838575B CN201810927172.1A CN201810927172A CN108838575B CN 108838575 B CN108838575 B CN 108838575B CN 201810927172 A CN201810927172 A CN 201810927172A CN 108838575 B CN108838575 B CN 108838575B
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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
- B23K31/00—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups
- B23K31/02—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups relating to soldering or welding
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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
- B23K37/00—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups
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- 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
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- Optics & Photonics (AREA)
- Resistance Welding (AREA)
- Pressure Welding/Diffusion-Bonding (AREA)
Abstract
The invention relates to a dissimilar metal plate welding device which comprises a bakelite base, wherein an anode conductive copper bar and a cathode conductive copper bar are fixedly connected to the bakelite base, the anode conductive copper bar and the cathode conductive copper bar are connected with each other through a metal foil, a bakelite pressing plate is arranged above the metal foil, a welding cavity for connecting a flying plate and a target plate is formed between the bakelite pressing plate and the metal foil, and a separation sheet for separating the edge between the flying plate and the target plate is arranged in the welding cavity. The dissimilar metal plate welding device is simple in structure, and the connecting process comprises loading instantaneous large pulse current on the metal foil, so that the narrow part of the metal foil is partially vaporized for a short time to generate a large amount of expansion gas so as to generate driving pressure, and the fly plate is driven to obtain a certain speed to strike the target plate at a high speed, so that a solid phase metallurgical bonding phenomenon is generated, and the dissimilar metal plate welding device is used for welding.
Description
Technical Field
The invention relates to a dissimilar metal plate welding device and method, and belongs to the field of high-energy plastic processing of metal materials.
Background
The high-energy-rate forming technique is a technique for forming a metal workpiece by high-pressure impact generated by instantaneous release of energy. Forming is performed by mechanical force relative to the traditional method. Since the deformation is not formed by the external force of the male die, there is no direct contact. Therefore, the surface quality of the formed workpiece is relatively good. And the metal fluidity is relatively good during forming, wrinkling is effectively reduced, forming precision is good, and the like.
Currently, high-energy-rate forming techniques involve electrohydraulic forming, explosive explosion forming, electromagnetic forming, and the like. There are many applications in the metal working field such as punching, cutting, powder compaction, forming, etc. using instantaneous high pressure impact. However, for the joining method of dissimilar plates, explosive explosion forming cannot extend the process to thin plates or small welding areas, and furthermore, increasingly stringent safety regulations prohibit the use of explosives. The most significant disadvantage of using magnetic pulses for metal working is the limited lifetime of its energized working coils under certain magnetic field forces and cyclic operating frequencies. Further, magnetic pulse based actuators are only effective when the workpiece has electrical conductivity. Conductive drive plates can be used to drive less conductive materials, but this increases process time and cost. The underwater discharge of electrohydraulic metal processing has exposed cavitation phenomenon formed by local high pressure in a working medium, so that the problems of low efficiency, uneven pressure and the like are caused.
Disclosure of Invention
In view of the defects of the prior art, the technical problem to be solved by the invention is to provide the dissimilar metal plate welding device and method, which are simple in structure, convenient and efficient.
In order to solve the technical problems, the technical scheme of the invention is as follows: the utility model provides a heterogeneous sheet metal welding set, includes the bakelite base, positive pole conduction copper bar and negative pole conduction copper bar have been linked firmly on the bakelite base, through metal foil interconnect between positive pole conduction copper bar and the negative pole conduction copper bar, the metal foil top is equipped with the bakelite clamp plate, form the welding chamber that is used for connecting flitch and target plate between bakelite clamp plate and the metal foil, be equipped with the spacer that is used for keeping apart the edge between flitch and the target plate in the welding chamber.
Preferably, a lower steel plate is arranged between the metal foil and the bakelite base, and an upper steel plate is arranged between the target plate and the bakelite pressing plate.
Preferably, the positive electrode conductive copper bar and the negative electrode conductive copper bar are fixedly connected with a wiring terminal at one end side and a foil connection terminal at the other end side.
Preferably, the first positioning groove for embedding the positive electrode conductive copper strip and the negative electrode conductive copper strip and the second positioning groove for embedding the lower steel plate are formed in the upper surface of the bakelite base, the third positioning groove for embedding the upper steel plate is formed in the lower surface of the bakelite pressing plate, the shape of the first positioning groove is adaptive to the conductive copper strip, the shape of the second positioning groove is adaptive to the lower steel plate, the shape of the third positioning groove is adaptive to the upper steel plate, mounting through holes are formed in the first positioning groove, the positive electrode conductive copper strip and the negative electrode conductive copper strip are connected to the bakelite base through outer hexagon bolts which penetrate through the mounting through holes downwards and upwards, and a regular hexagon countersink is formed in the lower surface of the bakelite base.
Preferably, the wiring terminals comprise wire pressing blocks, the wire pressing blocks are all screwed at the front ends of the positive electrode conductive copper bars and the negative electrode conductive copper bars through screwing bolts, the foil connecting terminals comprise foil pressing blocks, the foil pressing blocks are all screwed at the rear ends of the positive electrode conductive copper bars and the negative electrode conductive copper bars through screwing bolts, and the ends of the metal foil are pressed between the foil pressing blocks and the conductive copper bars.
Preferably, the metal foil is thin in the middle and thick on both sides.
Preferably, the spacer is a split first sheet body and a split second sheet body, and a space is reserved between the first sheet body and the second sheet body.
Preferably, the isolating sheet is of an integrated reverse-shaped structure.
A welding method of a dissimilar metal plate welding device comprises the following steps: (1) preparation of a tool: according to the technical scheme, the tooling is carried out, a foil pressing block is used for fixing a metal foil, a wire pressing block is used for pressing an electrode terminal, a screwing bolt is screwed, a fly plate (one of metal plates to be welded) is arranged on the metal foil, a separation plate is arranged on the fly plate, a target plate is arranged on the separation plate, and an upper steel plate is arranged on the target plate; (2) charging preparation: the voltage of the external network is boosted through a boosting transformer, then alternating current is converted into direct current through a rectifier, then an energy storage capacitor is charged through a current limiting resistor, and after the charging reaches a preset voltage, a charging loop is disconnected; (3) discharge connection: the high-voltage switch of the discharge loop is connected, the energy storage capacitor discharges instantaneous pulse high current, then the metal foil is discharged through the conductive copper bar, the metal foil is instantaneously vaporized, a large amount of expansion gas is generated, driving pressure is further generated, and the fly plate is driven to impact the target plate at a high speed, so that welding is realized.
Compared with the prior art, the invention has the following beneficial effects: the dissimilar metal plate welding device has a simple structure, and the connecting process comprises loading instantaneous large pulse current on a metal foil, so that a narrow part of the metal foil is gasified for a short time to generate a large amount of expansion gas so as to generate driving pressure, and a fly plate is driven to obtain a certain speed to strike a target plate at a high speed, so that a solid-phase metallurgical bonding phenomenon is generated, and welding is performed; the metal foil can be vaporized to generate strong driving pressure to push the fly plate to impact the target plate.
The invention will be described in further detail with reference to the drawings and the detailed description.
Drawings
Fig. 1 is an exploded view of an embodiment of the present invention.
Fig. 2 is a perspective view of an embodiment of the present invention.
Fig. 3 isbase:Sub>A cross-sectional view of the welding principle in the directionbase:Sub>A-base:Sub>A in fig. 2.
Fig. 4 is a perspective view of the bakelite base.
Fig. 5 is a bottom view of the bakelite base.
Fig. 6 is a perspective view of an bakelite pressing plate.
Fig. 7 is a side view of the metal foil shown enlarged.
Detailed Description
In order to make the above features and advantages of the present invention more comprehensible, embodiments accompanied with figures are described in detail below.
As shown in fig. 1-7, a dissimilar metal plate welding device comprises a bakelite base 1, wherein an anode conductive copper bar 2 and a cathode conductive copper bar 3 are fixedly connected to the bakelite base, the anode conductive copper bar and the cathode conductive copper bar are connected with each other through a metal foil 4, a bakelite pressing plate 5 is arranged above the metal foil, a welding cavity for connecting a flyer 6 and a target 7 is formed between the bakelite pressing plate and the metal foil, and a spacer 8 for isolating the edge between the flyer and the target is arranged in the welding cavity; the positive electrode conductive copper bar and the negative electrode conductive copper bar are used for conducting current, so that short-time pulse current is loaded on the metal foil, the metal foil is vaporized in a short time, strong driving pressure is generated to push the fly plate to impact the target plate, and metal welding is realized; the bakelite base and the bakelite pressing plate are made of bakelite materials, and the bakelite base is used for being insulated from the workbench to ensure the safety of the operation process.
In the embodiment of the invention, a lower steel plate 9 is arranged between the metal foil and the bakelite base, an upper steel plate 10 is arranged between the target plate and the bakelite pressing plate, and the lower steel plate is used for bearing and centralizing the pressure brought by vaporization of the metal foil to the target plate, and simultaneously isolating the high temperature influence brought by vaporization, protecting the bakelite base and prolonging the service life of the device.
In the embodiment of the invention, the positive electrode conductive copper bar and the negative electrode conductive copper bar are fixedly connected with a wiring terminal at one end side and a foil connection terminal at the other end side.
In the embodiment of the invention, the upper surface of the bakelite base is provided with a first positioning groove 11 for embedding the positive conductive copper strip and the negative conductive copper strip and a second positioning groove 12 for embedding the lower steel plate, the lower surface of the bakelite pressing plate is provided with a third positioning groove 13 for embedding the upper steel plate, the shape of the first positioning groove is adapted to the conductive copper strip, the shape of the second positioning groove is adapted to the lower steel plate, the shape of the third positioning groove is adapted to the upper steel plate, the first positioning grooves are all provided with mounting through holes 14, the positive conductive copper strip and the negative conductive copper strip are connected to the bakelite base through outer hexagon bolts 15 penetrating through the mounting through holes downwards and upwards in a screwed mode, the lower surface of the bakelite base is provided with regular hexagon countersunk holes 16, the countersunk holes ensure that the heads of the outer hexagon bolts of metals sink in the bakelite base for insulation protection, the safety operation and reliability are ensured. Simultaneously, countersink design processing is regular hexagon shape, therefore, when outer hexagon bolt carries out the part and connects, the head can sink in the hole and by countersink constraint and can not rotate, only need operate the nut end screw up the operation can, its assembly is more convenient.
In the embodiment of the invention, the wiring terminals comprise wire pressing blocks 17 which are all screwed at the front ends of the positive electrode conductive copper bar and the negative electrode conductive copper bar through screwing bolts 18, the foil receiving terminals comprise foil pressing blocks 19 which are all screwed at the rear ends of the positive electrode conductive copper bar and the negative electrode conductive copper bar through screwing bolts, and the ends of the metal foil are pressed between the foil pressing blocks and the conductive copper bars; the conductive copper strip is used for connecting the positive electrode and the negative electrode of the capacitor bank with a loop of the metal foil, instant pulse high current can be conducted, the foil pressing block is used for pressing the metal foil, stable work of the metal foil is guaranteed, the wire pressing block can ensure that the positive electrode terminal 31 and the negative electrode terminal 32 are in compression joint on the conductive copper strip, the screw tightening degree can be adjusted by screwing the bolt, pressing can be guaranteed, and the sparking phenomenon caused by loose wire pressing is prevented.
In the embodiment of the invention, the wire pressing block and the foil pressing block can be made of small resistance or insulator materials such as copper or bakelite, so that the resistance of a system loop is reduced to the minimum.
In the embodiment of the present invention, the metal foil is thin at the middle and thick at both sides, forming a narrow region 20, the size of which can be used to control the welding area and size.
In the embodiment of the invention, the separation sheet is a split first sheet body 21 and a split second sheet body 22, a gap 23 is arranged between the first sheet body and the second sheet body, the gap can be used for controlling the welding area and the size, the gap plays a role of providing an acceleration distance for high-speed impact of the flyer, so that the flyer can reach a certain speed within the distance after being subjected to driving pressure, further, the condition of solid-phase metallurgical bonding is achieved, and meanwhile, the welding area and the size can be controlled by adjusting the distance between the first sheet body and the second sheet body.
In the embodiment of the invention, the spacer is in an integrated structure in a shape of a Chinese character 'hui', and the middle holes in the shape of the Chinese character 'hui' form the intervals 23.
In the embodiment of the invention, before the tooling assembly is carried out, the lower steel plate and the metal foil are required to be wrapped by the insulating PET polyester film, so that the resistance of the whole power-on loop is reduced as much as possible, the influence of peripheral factors is eliminated as much as possible, and the energy utilization rate of the system is improved.
A welding method of a dissimilar metal plate welding device comprises the following steps: (1) preparation of a tool: according to the technical scheme, the tooling is carried out, a foil pressing block is used for fixing a metal foil, a wire pressing block is used for pressing an electrode terminal, a screwing bolt is screwed, a fly plate (one of metal plates to be welded) is arranged on the metal foil, a separation plate is arranged on the fly plate, a target plate is arranged on the separation plate, and an upper steel plate is arranged on the target plate; (2) charging preparation: the voltage of the external network is boosted by a booster transformer 24, the booster transformer comprises a primary coil 29 and a secondary coil 30, then alternating current is converted into direct current by a rectifier 25, then an energy storage capacitor is charged by a current limiting resistor 26, and after the charging reaches a preset voltage, a charging loop is disconnected; (3) discharge connection: the high-voltage switch 27 of the discharge loop is connected, the energy storage capacitor 28 releases instantaneous pulse high current, then the metal foil is discharged through the conductive copper bar, the metal foil is instantaneously vaporized, a large amount of expansion gas is generated to generate driving pressure, the fly plate is driven to strike the target plate at a high speed to realize welding, the connection cost is low, the connection effect is good, the connection strength is even higher than that of weaker parent metal, the structural design is reasonable, and the assembly is convenient; the plate connection is carried out through the impact generated by the electric explosion, and compared with the requirement of magnetic pulse connection on the magnetic permeability of the plate, the electric explosion connection has wider application range of the plate material. Meanwhile, the explosive is safe relative to explosive explosion forming; on the other hand, the metal aluminum foil with lower price can be selected as the triggering material, so that the connection cost is lower, and the service life problem of the triggering mechanism is avoided; and the impact speed generated by the device is high, so that the quality of the connecting area is ensured.
In the embodiment of the invention, the bakelite pressing plate is used for pressing down to resist the impact force of vaporization explosion, so that the stability of the whole device is ensured, and the pressing down power source can adopt an external clamp or an oil cylinder to provide pressing down force F.
In the embodiment of the invention, by loading a pulsed current on the metal foil, which is vaporized for a short time, a large amount of suddenly expanding gas is generated to induce strong mechanical impact, the driving pressure can reach several GPa, so that if the workpiece is placed near the conductor, it will be accelerated to a high speed and useful work can be performed on it. The workpiece speed can be driven to exceed 1km/s. With this strong driving pressure, many applications can be made in the metal forming industry.
The present invention is not limited to the above-described preferred embodiments, and any person can obtain other various types of dissimilar metal plate welding apparatuses and methods in the light of the present invention. All equivalent changes and modifications made according to the claims of the present invention shall fall within the scope of the present invention.
Claims (2)
1. The utility model provides a dissimilar metal sheet welding set which characterized in that: the electric wood welding device comprises an electric wood base, wherein an anode conduction copper bar and a cathode conduction copper bar are fixedly connected to the electric wood base, the anode conduction copper bar and the cathode conduction copper bar are connected with each other through a metal foil, an electric wood pressing plate is arranged above the metal foil, a welding cavity for connecting a flying plate and a target plate is formed between the electric wood pressing plate and the metal foil, and a separation sheet for separating the edge between the flying plate and the target plate is arranged in the welding cavity; a lower steel plate is arranged between the metal foil and the bakelite base, and an upper steel plate is arranged between the target plate and the bakelite pressing plate; the positive electrode conductive copper bar and the negative electrode conductive copper bar are fixedly connected with a wiring terminal on one end side and a foil connection terminal on the other end side; the upper surface of the bakelite base is provided with a first positioning groove for embedding an anode conductive copper bar and a cathode conductive copper bar and a second positioning groove for embedding a lower steel plate, the lower surface of the bakelite pressing plate is provided with a third positioning groove for embedding an upper steel plate, the shape of the first positioning groove is adaptive to the conductive copper bar, the shape of the second positioning groove is adaptive to the lower steel plate, the shape of the third positioning groove is adaptive to the upper steel plate, the first positioning grooves are provided with mounting through holes, the anode conductive copper bar and the cathode conductive copper bar are connected to the bakelite base through outer hexagon bolts which penetrate through the mounting through holes downwards and upwards in a threaded manner, and the lower surface of the bakelite base is provided with regular hexagon countersunk holes; the wiring terminals comprise wire pressing blocks which are screwed at the front ends of the positive electrode conductive copper bars and the negative electrode conductive copper bars through screwing bolts, the foil receiving terminals comprise foil pressing blocks which are screwed at the rear ends of the positive electrode conductive copper bars and the negative electrode conductive copper bars through screwing bolts, and the ends of the metal foil are pressed between the foil pressing blocks and the conductive copper bars; the middle of the metal foil is thin, and the two sides of the metal foil are thick; the separation sheet is a split type first sheet body and a split type second sheet body, and a space is reserved between the first sheet body and the second sheet body, or the separation sheet is an integrated type 'back' shape structure.
2. A welding method of the dissimilar metal plate welding device according to claim 1, wherein the welding method is performed by: (1) preparation of a tool: according to the technical scheme, the tooling is carried out, a foil pressing block is used for fixing a metal foil, a wire pressing block is used for pressing an electrode terminal, a screwing bolt is screwed, a fly plate is arranged on the metal foil, a separation plate is arranged on the fly plate, a target plate is arranged on the separation plate, and an upper steel plate is arranged on the target plate; (2) charging preparation: the voltage of the external network is boosted through a boosting transformer, then alternating current is converted into direct current through a rectifier, then an energy storage capacitor is charged through a current limiting resistor, and after the charging reaches a preset voltage, a charging loop is disconnected; (3) discharge connection: the high-voltage switch of the discharge loop is connected, the energy storage capacitor discharges instantaneous pulse high current, then the metal foil is discharged through the conductive copper bar, the metal foil is instantaneously vaporized, a large amount of expansion gas is generated, driving pressure is further generated, and the fly plate is driven to impact the target plate at a high speed, so that welding is realized.
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| CN201810927172.1A CN108838575B (en) | 2018-08-15 | 2018-08-15 | Dissimilar metal plate welding device and method |
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| CN201810927172.1A CN108838575B (en) | 2018-08-15 | 2018-08-15 | Dissimilar metal plate welding device and method |
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| CN108838575B true CN108838575B (en) | 2023-04-25 |
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| CN111482723B (en) * | 2020-04-22 | 2021-04-20 | 华中科技大学 | Automatic spot welding device and method based on aluminum foil electrogenerated steam explosion |
| CN112518159B (en) * | 2020-11-12 | 2021-09-07 | 华中科技大学 | Surface treatment and welding device and method for metal workpiece |
| CN112475290A (en) * | 2020-11-16 | 2021-03-12 | 福州大学 | Powder compacting device and method based on metal foil gasification |
| CN113664359B (en) * | 2021-08-24 | 2022-04-26 | 华中科技大学 | Welding device and welding method based on aluminum foil electrogenerated steam explosion |
| CN113857856A (en) * | 2021-10-26 | 2021-12-31 | 福州大学 | Device and method for forming and welding metal plate |
| CN115319322A (en) * | 2022-08-26 | 2022-11-11 | 广州亨龙智能装备股份有限公司 | Explosion process and welding structure of high-current pulse energy storage resistor |
| CN115971712B (en) * | 2023-01-03 | 2023-08-18 | 华中科技大学 | High-speed impact welding method for metal |
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| SU569081A1 (en) * | 1975-12-15 | 1990-02-28 | Проектно-конструкторское бюро электрогидравлики АН УССР | Apparatus for applying high pulsed pressure onto specimen |
| US8136378B2 (en) * | 2009-09-21 | 2012-03-20 | Ford Global Technologies, Llc | Seal for fluid forming tools |
| CN106482591B (en) * | 2016-12-14 | 2017-12-05 | 中国工程物理研究院化工材料研究所 | One kind impact piece transducing meta structure and preparation method thereof |
| CN108043976B (en) * | 2017-12-28 | 2019-04-09 | 武汉理工大学 | A kind of different metal materials preform high speed impact Joining Technology |
| CN108161211A (en) * | 2018-03-05 | 2018-06-15 | 中国矿业大学 | A kind of explosion welding method of iron based metallic glass foil and multilayer metal foil plate |
| CN208680798U (en) * | 2018-08-15 | 2019-04-02 | 福州大学 | A kind of dissimilar metal sheet welder |
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