High-efficiency spot welding equipment for processing sheet metal parts of aircraft structures

Abstract

This invention discloses a high-efficiency spot welding device for processing sheet metal parts of aircraft structures, including a fuselage, a high-frequency current generator, a spot welding assembly, a bracket, a first mounting hole, a second mounting hole, a first connecting sleeve, a limiting spring, a connector, a limiting groove, a transducer, an amplitude transformer, an insulating plate, a connecting plate, a terminal block, a third mounting hole, a mounting base, a partition, a notch, a threaded pipe, and a first through hole. This invention rapidly cools the welding tools by continuously introducing coolant into the mounting base, preventing damage due to high temperatures. By setting multiple welding tools on the mounting base and switching them using a worm gear mechanism, this invention enables multiple welding tool switching operations, thus avoiding the impact on work efficiency due to downtime for cooling. Compared to friction stir welding, this invention uses ultrasonic spot welding combined with resistance spot welding, which reduces welding tool wear and equipment costs while ensuring welding quality and minimizing damage to the surface of the welded parts.

Description

Technical Field

[0001] This invention relates to the field of spot welding equipment technology, specifically to high-efficiency spot welding equipment for processing sheet metal parts for aircraft structures. Background Technology

[0002] Resistance spot welding utilizes the resistance heat generated as an electric current flows through the workpieces to create a weld nugget between them, thus achieving a welded connection. Spot welding is mainly used for welding thin sheet metal stampings with a thickness of less than 4mm, and is particularly suitable for welding automobile bodies and carriages, as well as aircraft fuselages.

[0003] Invention patent CN110653506B discloses a spot welding device and a spot welding method. The spot welding device uses a combination of friction stir spot welding and resistance spot welding to weld the parts to be processed. Specifically, an electric current is applied during the friction stir spot welding process to improve the microstructure of the weld nugget, resulting in a significant improvement in the mechanical properties of the weld joint. This welding method overcomes the problem of insufficient heat generation due to the high conductivity of resistance spot welding alone, as well as the problem of "keyhole" (caused by insufficient fineness and uniformity of the microstructure) that occurs when using friction stir spot welding alone. The resulting weld joint combines the advantages of both methods, resulting in a significant improvement in the mechanical properties of the weld joint.

[0004] Regarding the aforementioned technologies, the inventors believe that the following drawbacks exist: First, the stirring head lacks a cooling design, which easily leads to accelerated wear due to excessively high temperatures; second, the use of a single stirring head design causes the temperature of the stirring head to rise continuously after continuous welding, resulting in accelerated wear, while stopping the machine to cool down will affect welding efficiency; third, although friction stir welding can overcome the problem of insufficient heat generation due to the high conductivity of resistance spot welding, the stirring head wears out quickly, and the stirring head requires a power source to provide rotational force, resulting in high equipment costs, and friction stir welding causes significant damage to the surface of the welded parts. Summary of the Invention

[0005] The purpose of this invention is to provide a high-efficiency spot welding device for processing sheet metal parts of aircraft structures, so as to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a high-efficiency spot welding device for processing sheet metal parts of aircraft structures, comprising a fuselage, wherein two high-frequency current generators are mounted on the fuselage, and spot welding assemblies are mounted on the high-frequency current generators. The spot welding assemblies include a bracket, a bracket is fixedly connected to the high-frequency current generator, a transducer is fixedly connected to the bracket, and the input terminal of the transducer is electrically connected to the output terminal of the high-frequency current generator. An amplitude transformer is fixedly connected to the output terminal of the transducer, and an insulating plate is fixedly connected to the other end of the amplitude transformer. A mounting base is provided on one side of the insulating plate, and the mounting base has two... Connecting plates are hinged to the outer side walls and fixedly connected to the insulating plate. A terminal block is fixedly connected to one of the connecting plates. Multiple welding tools are threaded onto the outer wall of the mounting base. Cooling pipes are conductively fixed to both outer walls of the mounting base. A connector is rotatably connected to the other end of the cooling pipe. A connector is fixedly connected to the cooling pipe. A first connecting sleeve is sleeved on the connector and hinged to the bracket. A motor is fixedly connected to the bracket. A worm gear is fixedly connected to the output end of the motor. A worm wheel is meshed on the worm gear and fixedly connected to one of the first connecting sleeves.

[0007] Preferably, the worm gear has a second through hole, and the cooling pipe is sleeved in the second through hole.

[0008] Preferably, the bracket has two first mounting holes, and two first connecting sleeves are respectively fitted into the two first mounting holes. The bracket has a second mounting hole, and the amplitude transformer is disposed in the second mounting hole.

[0009] Preferably, the two connectors are provided with multiple limiting grooves, and limiting springs are provided in the limiting grooves, and the limiting springs are fixedly connected to the first connecting sleeve.

[0010] Preferably, the two connecting plates are provided with a third mounting hole, a second connecting sleeve is sleeved in the third mounting hole, and the two second connecting sleeves are respectively fixedly connected to the outer walls of the two sides of the mounting base. A first through hole is provided on the mounting base at the position corresponding to the second connecting sleeve, and the first through hole is connected to the cooling pipe.

[0011] Preferably, the welding tool has a threaded hole, and a threaded tube is threadedly connected to the threaded hole, and the threaded tube is conductively connected to the mounting base.

[0012] Preferably, a partition plate is fixedly connected inside the mounting base, and a notch is provided on the partition plate at the position corresponding to the threaded tube.

[0013] Compared with the prior art, the beneficial effects of the present invention are as follows: The present invention rapidly cools the welding tool by continuously introducing coolant into the mounting base, thus preventing damage to the welding tool due to high temperature; The present invention sets multiple welding tools on the mounting base and uses a worm gear mechanism for switching, thereby realizing the switching operation of multiple welding tools and avoiding the impact of downtime for cooling on work efficiency; Compared with friction stir welding, the present invention uses ultrasonic spot welding combined with resistance spot welding, which reduces the wear of welding tools and lowers equipment costs while ensuring welding effect, and also causes less damage to the surface of the welded parts. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall three-dimensional structure of the present invention;

[0015] Figure 2 This is a three-dimensional structural diagram of the spot welding assembly of the present invention;

[0016] Figure 3 This is a schematic diagram of the main structure of the spot welding assembly of the present invention;

[0017] Figure 4 This is an exploded view of the three-dimensional structure of the spot welding assembly of the present invention;

[0018] Figure 5 This is a three-dimensional cross-sectional view of the mounting base of the present invention;

[0019] In the diagram: 1. Body; 11. High-frequency current generator; 2. Spot welding assembly; 21. Bracket; 211. First mounting hole; 212. Second mounting hole; 213. First connecting sleeve; 214. Limiting spring; 215. Connector; 216. Limiting groove; 22. Transducer; 221. Amplifier rod; 222. Insulating plate; 223. Connecting plate; 224. Terminal block; 225. Third mounting hole; 23. Mounting base; 231. Partition plate; 232. Notch; 233. Threaded pipe; 234. First through hole; 235. Second connecting sleeve; 236. Welding tool; 237. Threaded hole; 238. Cooling pipe; 239. Connector; 24. Motor; 241. Worm gear; 242. Worm wheel; 243. Second through hole. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] Please see Figure 1-5An embodiment of the present invention provides a high-efficiency spot welding device for processing sheet metal parts of aircraft structures, comprising a fuselage 1, two high-frequency current generators 11 mounted on the fuselage 1, spot welding assemblies 2 mounted on the high-frequency current generators 11, the spot welding assembly 2 including a bracket 21, the bracket 21 being fixedly connected to the high-frequency current generators 11, a transducer 22 being fixedly connected to the bracket 21, and the input terminal of the transducer 22 being electrically connected to the output terminal of the high-frequency current generators 11, the output terminal of the transducer 22 being fixedly connected to an amplitude transformer 221, the other end of the amplitude transformer 221 being fixedly connected to an insulating plate 222, a mounting base 23 being provided on one side of the insulating plate 222, and the mounting base 23 having two... Connecting plates 223 are hinged to the outer side walls and are fixedly connected to the insulating plate 222. One of the connecting plates 223 is fixedly connected to a terminal post 224. Multiple welding tools 236 are threaded onto the outer wall of the mounting base 23. Cooling pipes 238 are conductively fixed on both outer walls of the mounting base 23. The other end of the cooling pipe 238 is rotatably connected to a connector 239. A connector 215 is fixedly connected to the cooling pipe 238. A first connecting sleeve 213 is sleeved on the connector 215 and hinged to the bracket 21. A motor 24 is fixedly connected to the bracket 21. A worm gear 241 is fixedly connected to the output end of the motor 24. A worm gear 242 is engaged with the upper part of the frame, and the worm gear 242 is fixedly connected to one of the first connecting sleeves 213. A second through hole 243 is provided on the worm gear 242, and a cooling pipe 238 is sleeved within the second through hole 243. Two first mounting holes 211 are provided on the bracket 21, and two first connecting sleeves 213 are respectively sleeved within the two first mounting holes 211. A second mounting hole 212 is provided on the bracket 21, and an amplitude transformer 221 is disposed within the second mounting hole 212. Multiple limiting grooves 216 are provided on the two connecting pieces 215, and limiting spring pieces 214 are provided within the limiting grooves 216, with the limiting spring pieces 214 fixedly connected within the first connecting sleeves 213. A third mounting hole 225 is provided on the connecting plate 223. A second connecting sleeve 235 is fitted into the third mounting hole 225. The two second connecting sleeves 235 are fixedly connected to the outer walls of the two sides of the mounting base 23. A first through hole 234 is provided on the mounting base 23 at the position corresponding to the second connecting sleeve 235. The first through hole 234 is connected to the cooling pipe 238. A threaded hole 237 is provided on the welding fixture 236. A threaded pipe 233 is threaded into the threaded hole 237. The threaded pipe 233 is connected to the mounting base 23. A partition plate 231 is fixedly connected inside the mounting base 23. A notch 232 is provided on the partition plate 231 at the position corresponding to the threaded pipe 233.

[0022] Working Principle: When spot welding sheet metal parts of an aircraft structure using this invention, the sheet metal parts are clamped and fixed to the fuselage 1 using a fixture. A high-frequency current generator 11 is driven by a drive mechanism to center the welding fixture 236 against the sheet metal parts. The high-frequency current generator 11 is then activated, converting electrical energy into mechanical vibration via a transducer 22. This vibration is transmitted to the welding fixture 236 through an amplitude transformer 221, an insulating plate 222, a connecting plate 223, a second connecting sleeve 235, and a mounting base 23, performing ultrasonic welding on the welded portion of the sheet metal parts. Simultaneously, power is connected via a terminal 224 to perform resistance welding on the welded portion of the sheet metal parts. Coolant is supplied to the mounting base 23 through a connector 239 and a cooling pipe 238 to reduce the temperature of the welding fixture 236. After completing a set number of welding operations, the motor 24 is started, which drives the worm wheel 242 via the worm gear 241. The worm wheel 242 drives the first connecting sleeve 213 to rotate one position. The first connecting sleeve 213 drives the connecting piece 215 via the limiting spring 214. The connecting piece 215 drives the cooling pipe 238 to rotate. The cooling pipe 238 drives the mounting base 23 to rotate via the second connecting sleeve 235, thereby realizing the switching of the welding tool 236 and avoiding the welding tool 236 from overheating due to long-term continuous operation. Among them, the limiting groove 216 is used to limit the limiting spring 214, the limiting spring 214 is used for shock absorption, the partition 231 and the notch 232 are used to separate the flow channels in the mounting base 23, and the threaded pipe 233 is used to install the welding tool 236.

[0023] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A high-efficiency spot welding equipment for processing sheet metal structural parts of aircraft, including a fuselage (1), characterized in that: Two high-frequency current generators (11) are installed on the fuselage (1). A spot welding assembly (2) is installed on the high-frequency current generator (11). The spot welding assembly (2) includes a bracket (21). The bracket (21) is fixedly connected to the high-frequency current generator (11). A transducer (22) is fixedly connected to the bracket (21). The input end of the transducer (22) is electrically connected to the output end of the high-frequency current generator (11). An amplitude transformer (221) is fixedly connected to the output end of the transducer (22). An insulating plate (222) is fixedly connected to the other end of the amplitude transformer (221). A mounting base (23) is provided on one side of the insulating plate (222). A connecting plate (223) is hinged to both outer walls of the mounting base (23). The connecting plate (223) is fixedly connected to the insulating plate (222). A terminal block (224) is fixedly connected to a connecting plate (223). Multiple welding tools (236) are threaded onto the outer wall of the mounting base (23). Cooling pipes (238) are fixedly connected to both outer walls of the mounting base (23). A connector (239) is rotatably connected to the other end of the cooling pipe (238). A connector (215) is fixedly connected to the cooling pipe (238). A first connecting sleeve (213) is sleeved on the connector (215). The first connecting sleeve (213) is hinged to the bracket (21). A motor (24) is fixedly connected to the bracket (21). A worm (241) is fixedly connected to the output end of the motor (24). A worm wheel (242) is meshed on the worm (241). The worm wheel (242) is fixedly connected to one of the first connecting sleeves (213). The worm gear (242) has a second through hole (243), and the cooling pipe (238) is sleeved in the second through hole (243); The bracket (21) has two first mounting holes (211), and two first connecting sleeves (213) are respectively fitted into the two first mounting holes (211). The bracket (21) has a second mounting hole (212), and the amplitude rod (221) is set in the second mounting hole (212). Multiple limiting grooves (216) are provided on the two connecting parts (215), and limiting spring pieces (214) are provided in the limiting grooves (216), and the limiting spring pieces (214) are fixedly connected to the first connecting sleeve (213); The two connecting plates (223) are provided with a third mounting hole (225), and a second connecting sleeve (235) is sleeved in the third mounting hole (225). The two second connecting sleeves (235) are respectively fixedly connected to the outer walls of the two sides of the mounting base (23). A first through hole (234) is provided on the mounting base (23) at the position corresponding to the second connecting sleeve (235), and the first through hole (234) is connected to the cooling pipe (238).

2. The high-efficiency spot welding equipment for processing aircraft structural sheet metal parts according to claim 1, characterized in that: The welding tool (236) has a threaded hole (237), and a threaded tube (233) is threadedly connected to the threaded hole (237), and the threaded tube (233) is connected to the mounting base (23).

3. The high-efficiency spot welding equipment for processing aircraft structural sheet metal parts according to claim 2, characterized in that: The mounting base (23) is fixedly connected to a partition plate (231), and a notch (232) is provided on the partition plate (231) at the position corresponding to the threaded tube (233).

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