A rear body water channel connecting device and its working method

Abstract

The application relates to a vehicle body rear water channel connecting device, which comprises a workbench surface, the upper surface of the workbench surface is provided with a bakelite base driven by an electric mechanism to rotate intermittently by 90 degrees, the outer side of the bakelite base is sequentially provided with a workpiece pressing station, a welding waste discharging station, a metal foil feeding station and a metal foil glue winding station on the upper surface of the workbench surface in a clockwise direction, the upper surface of the bakelite base is fixedly connected with four conductive copper strips at four square edges, the four conductive copper strips are used to correspond to the four stations, the upper side of the bakelite base is provided with a lifting cover plate, the lifting cover plate is provided with positive and negative terminals which are electrically connected with the conductive copper strips corresponding to the workpiece pressing station when the lifting cover plate is lowered, and the lifting cover plate is also provided with foil pressing blocks which press the metal foils on the conductive copper strips corresponding to the metal foil feeding station, the metal foil glue winding station and the workpiece pressing station when the lifting cover plate is lowered. The device has reasonable structure design and convenient assembly, and can fully meet the operation requirements of the method.

Description

TECHNICAL FIELD

[0001] The present application relates to a kind of vehicle body rear gutter connecting device and its working method, belong to the high-energy rate forming field of plastic processing of metal material. BACKGROUND

[0002] Under the background of light weight, how to reduce the weight of automobile gradually becomes the focus of research, and light weight has become the consensus of automobile industry as an important way to realize automobile energy saving and emission reduction. Aluminum alloy has become the main material for light weight vehicle body manufacturing due to its light weight, corrosion resistance, good energy absorption and recyclability. However, due to its active chemical properties, high thermal conductivity, easy formation of welding bubbles and inclusions, etc., the welding performance is poor. With the continuous improvement of China's automobile industry and people's living standards, the performance, appearance and quality of automobiles are also paid more and more attention, and the surface quality of some visible welding surfaces is also put forward higher and higher requirements. As a visible appearance surface for consumers, the quality of the rear gutter directly affects the sensory quality of the whole vehicle, so a better solution for the connection at the rear gutter is needed. Traditional resistance spot welding and arc welding processes are difficult to achieve ideal flatness of the welding surface, so a method and device for high-energy rate forming of vehicle body connection are proposed.

[0003] High-energy rate forming refers to a forming method that releases a large amount of energy in a short time to cause metal deformation. It includes explosion forming, electro-hydraulic forming, electromagnetic forming and other methods. Among them, the welding technology of high-energy rate forming includes explosion welding, magnetic pulse welding, laser impact welding and foil vaporization welding. For the connection method of metal, explosion welding has great power and must be operated in the field, which is difficult to realize thin plate or small area welding, and the use of explosives is limited by many factors. Magnetic pulse welding is suitable for materials with good electrical conductivity, and materials with low electrical conductivity need to be indirectly driven by aluminum or copper drivers, which not only increases the cost of materials, but also increases the process time after the separation of the driver and the workpiece. In addition, reliable electromagnetic drivers for high temperature and high pressure conditions do not exist or have limited service life. Laser impact welding is a new process technology, which has many shortcomings and needs to continue to invest a lot of manpower and time for research and improvement.

[0004] The present application uses foil vaporization welding to connect metal plates, applies pulse current to the metal foil to rapidly heat and vaporize, generates a large amount of expanding gas in a short time to cause strong mechanical impact, and can generate a driving force of several GPa. Based on this, the workpiece is placed near the conductor, which can drive the workpiece to accelerate to more than 1km / s. Such strong driving force can complete the stamping forming and welding of the plate. Therefore, the device and process are improved and optimized to enable welding in some narrow and curved areas, which has great significance for the connection of the rear gutter of the vehicle body. SUMMARY

[0005] In view of the deficiencies of the prior art, the technical problem to be solved by the present application is to provide a vehicle body rear water channel connecting device and a working method thereof.

[0006] In order to solve the above technical problems, the technical scheme of the present application is: a vehicle body rear water channel connecting device, comprising a workbench top, the upper surface of the workbench top is provided with a bakelite base driven by an electric mechanism to rotate intermittently by 90 degrees, the outer side of the bakelite base is sequentially provided with a workpiece pressing station, a welding waste discharging station, a metal foil feeding station and a metal foil gluing station on the upper surface of the workbench top in a clockwise direction, the upper surface of the bakelite base is fixedly connected with four conductive copper strips at the four corners, the four conductive copper strips are used to correspond to the four stations respectively, a lifting cover plate is arranged above the bakelite base, the lifting cover plate is provided with positive and negative terminals which are electrically connected with the conductive copper strips corresponding to the workpiece pressing station when the lifting cover plate is lowered, and the lifting cover plate is also provided with foil pressing blocks which press the metal foil on the conductive copper strips corresponding to the metal foil feeding station, the metal foil gluing station and the workpiece pressing station when the lifting cover plate is lowered.

[0007] Preferably, the bakelite base is made of a good insulating bakelite material, the upper surface of the bakelite base is processed with four grooves for placing the conductive copper strips, and the center of the upper surface of the bakelite base is provided with an axial vertical guide hole, the center of the lifting cover plate is fixedly provided with a guide rod which enters the guide hole for vertical guidance when the lifting cover plate is lifted.

[0008] Preferably, the conductive copper strips are all locked on the bakelite base by screws.

[0009] Preferably, the inner side of each conductive copper strip is fixedly provided with two connecting strips which are electrically connected with the positive and negative terminals when the lifting cover plate is lowered, and the connecting strips are all provided with recessed circular grooves which are matched with the positive and negative terminals when electrically connected.

[0010] Preferably, the metal foil is shaped like a U, the U-shaped bottom is wide on both sides and narrow in the middle, when a transient large pulse current is applied, the narrow part of the metal foil rapidly vaporizes to generate a large amount of expanding gas and then generates a driving pressure, and an insulating PET polyester film is pasted on the narrow part of the metal foil.

[0011] Preferably, a lower pad is arranged on the workpiece pressing station, a target plate is placed on the upper surface of the lower pad, a water channel plate is placed on the upper surface of the target plate, and a metal foil is placed on the upper surface of the water channel plate and is pressed tightly by a pressing plate driven by a hydraulic pump.

[0012] Preferably, the welding waste material discharging station and the metal foil feeding station each comprise two vertical air cylinders, the cylinder bodies of the two vertical air cylinders are fixedly connected to the workbench top, the piston rods of the two vertical air cylinders are fixedly connected to an adapter block upward, two horizontal air cylinders are installed on the adapter block, the cylinder bodies of the two horizontal air cylinders are fixedly connected to the adapter block, the piston rods of the two horizontal air cylinders are fixedly connected to an adapter rod toward the bakelite base, and a downward vacuum suction disc is installed on the adapter rod.

[0013] A working method of a vehicle body rear water channel connecting device is performed according to the following steps: (1) a metal foil is placed on the vacuum suction disc of the metal foil feeding station and is sucked, the metal foil feeding station places the metal foil on the corresponding conductive copper strip, then the lifting cover plate is lowered to make the foil pressing block press the metal foil on the conductive copper strip, then the lifting cover plate is raised to reset, the metal foil is light in weight and soft in material, and is formed to be a certain adhesion with the conductive copper strip under the action of a relatively large pressing force, so that short-time fixation is achieved; (2) the bakelite base is rotated clockwise by 90 degrees, the metal foil is rotated to the metal foil glue winding station, then the lifting cover plate is lowered to make the foil pressing block press the metal foil on the conductive copper strip, the insulating PET polyester film is manually pasted on the middle narrow part of the metal foil to perform insulation treatment, and then the lifting cover plate is raised to reset; (3) the bakelite base continues to rotate clockwise by 90 degrees to reach the workpiece pressing station, the metal foil is located above the water channel plate, the lifting cover plate and the pressing plate are pressed downward, the connecting strip of the conductive copper strip is in electrical contact with the positive and negative terminals, the foil pressing block on the lifting cover plate is pressed to complete the current loop at the same time, the pressing plate also provides sufficient pre-tightening force for welding, and welding can be started, during work, the positive and negative terminals connected with the capacitor group are connected with the conductive copper strip to conduct current, and then short-time pulse current is loaded on the metal foil to make the metal foil rapidly heat up and vaporize, driving force generated by vaporization drives the water channel plate to impact and collide with the target plate to realize welding; (4) after welding is completed, the lifting cover plate and the pressing plate are raised, the bakelite base continues to rotate clockwise by 90 degrees, the vacuum suction disc of the welding waste material discharging station sucks the metal foil waste, the waste is manually cleaned, and one process is completed, and the above process is repeated to achieve continuous operation.

[0014] Compared with the prior art, the present application has the following beneficial effects:

[0015] ① The plate material is welded by the impact force of foil vaporization, compared with magnetic pulse welding with similar forming mechanism, the present application has a wider range of applicable materials and is not limited by the magnetic permeability of the plate material. ② The price of aluminum foil, which can be selected as the trigger material, is low, the cost can be reduced, and there is no service life problem of the trigger mechanism. ③ The impact force generated by foil vaporization is large enough to ensure the quality of the connection area. ④ Continuous welding can be achieved. The present application has low connection cost, good connection effect, strong adaptability, and a flat appearance after connection. The device structure is reasonable in design and convenient to assemble, and can fully meet the operation requirements of the present application.

[0016] The application will be further described below in conjunction with the accompanying drawings and specific embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 An exploded view of an embodiment of the application.

[0018] Figure 2 An exploded view of an embodiment of the application. Figure 1 .

[0019] Figure 3 An exploded view of an embodiment of the application.

[0020] Figure 4 An exploded view of an embodiment of the application.

[0021] Figure 5 An exploded view of an embodiment of the application.

[0022] Figure 6 An exploded view of an embodiment of the application. Figure 2 .

[0023] Figure 7 A top view of a bakelite base.

[0024] Figure 8 A top view of a conductive copper strip.

[0025] Figure 9 A front view of a conductive copper strip. DETAILED DESCRIPTION

[0026] The application will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0027] It should be noted that the following detailed description is exemplary in nature and is intended to provide further description of the application. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

[0028] It is also to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting, as the scope of the exemplary embodiments of this application will be limited only by the appended claims. As used herein, unless the context clearly dictates otherwise, the use of the singular herein is intended to include the plural. Furthermore, to the extent that any term is used in the singular herein, we also intend that the plural of said term, and vice versa, also be covered.

[0029] As Figures 1-9As shown, the embodiment provides a kind of car body rear gutter connecting device, including worktop 28, the upper surface of the worktop is provided with bakelite base 1 by electric mechanism drive 90 degree intermittent rotation, the outer side of the bakelite base is sequentially provided with workpiece pressing station 2, welding waste unloading station 3, metal foil loading station 4, metal foil glue winding station 5 on the upper surface of worktop along clockwise direction, the upper surface of the bakelite base is all fixed with conductive copper strip 6 in four square edges, four conductive copper strips are used to one-to-one correspond the four stations described above, the upper of the bakelite base is provided with lifting cover plate 7, lifting cover plate adopts hydraulic drive lifting, the lifting cover plate is provided with positive and negative terminal 8 for the conductive copper strip electrically connected with workpiece pressing station when descending, it is also provided with foil pressing block 9 for the conductive copper strip on metal foil 27 of metal foil loading station, metal foil glue winding station, workpiece pressing station corresponding when descending.The conductive copper strip is used for the loop connection of the positive and negative pole of capacitor group and metal foil, and can conduct instantaneous pulse large current.

[0030] In the embodiment of the application, the bakelite base is a good insulating bakelite material, which can ensure the safety of the operation process, the upper surface of the bakelite base is processed with four grooves 10 for placing the conductive copper strips, the center of the upper surface of the bakelite base is provided with an axial vertical guide hole 11, and the center of the lifting cover plate is fixed with a guide rod 12 for vertical guidance when lifting.

[0031] In the embodiment of the application, the conductive copper strips are all locked on the bakelite base by screws 13.

[0032] In the embodiment of the application, the inner side of the conductive copper strip is fixed with two connection strips 14 for electrically contacting with the positive and negative terminals when descending, and the connection strips are all provided with recessed circular grooves 15 for cooperating with the positive and negative terminals when electrically contacting.

[0033] In the embodiment of the application, the metal foil is in the shape of a U-shaped, the U-shaped bottom is wide on both sides and narrow in the middle, when a large instantaneous pulse current is applied, the narrow part of the bottom serves as an explosion point, and the narrow part of the metal foil rapidly vaporizes to generate a large amount of expanding gas and then generates driving pressure. This structure is suitable for connection in narrow and curved parts, and the U-shaped shape can be adjusted to adapt to more connection occasions. The narrow part of the metal foil is pasted with an insulating PET polyester film 16, so as to reduce the resistance of the power loop and improve the energy utilization rate of the system.

[0034] In the embodiment of the present application, the workpiece pressing station is provided with a lower cushion 17, a target plate 18 is placed on the lower cushion, a water channel plate 19 is placed on the target plate, and a metal foil is placed on the water channel plate and pressed down by a pressing plate 21 driven by a hydraulic pump 20. The hydraulic pump can provide sufficient downward pressing force F to resist the impact force generated by vapor explosion and ensure the stability of the overall device.

[0035] In the embodiment of the present application, the welding waste unloading station and the metal foil feeding station each include two vertical cylinders 22, the cylinder bodies of the two vertical cylinders are fixedly connected to the workbench top, the piston rods of the two vertical cylinders are fixedly connected to an adapter block 23 upward, two horizontal cylinders 24 are installed on the adapter block, the cylinder bodies of the two horizontal cylinders are fixedly connected to the adapter block, the piston rods of the two horizontal cylinders are fixedly connected to an adapter rod 25 toward the bakelite base, and a downward vacuum chuck 26 is installed on the adapter rod.

[0036] A working method of a vehicle body rear water channel connecting device is performed in the following steps: (1) manually placing a metal foil on the vacuum chuck of the metal foil feeding station and sucking it, the metal foil feeding station placing the metal foil on the corresponding conductive copper strip, then lowering the lifting cover plate to make the foil pressing block press the metal foil on the conductive copper strip, and then raising the lifting cover plate to reset, the metal foil is light in weight and soft in material, and forms a certain adhesion with the conductive copper strip under the action of a large pressing force, meeting the short-time fixation; (2) rotating the bakelite base clockwise by 90 degrees, the metal foil is rotated to the metal foil glue winding station, then the lifting cover plate is lowered to make the foil pressing block press the metal foil on the conductive copper strip, manually pasting the insulating PET polyester film on the middle narrow part of the metal foil for insulation treatment, and then raising the lifting cover plate to reset; (3) continuing to rotate the bakelite base clockwise by 90 degrees to reach the workpiece pressing station, the metal foil is located on the water channel plate, the lifting cover plate and the pressing plate are pressed down, the connecting strip of the conductive copper strip is in electrical contact with the positive and negative terminals, the foil pressing block on the lifting cover plate is pressed to complete the current loop at the same time, the pressing plate also provides sufficient pre-tightening force for welding, and the welding can be started, the positive and negative terminals connected with the capacitor group 17-2 conduct current through the conductive copper strip to load a short-time pulse current on the metal foil, so that the metal foil is rapidly heated and vaporized, the driving force generated thereby drives the water channel plate to impact and collide with the target plate to realize welding; (4) after the welding is completed, the lifting cover plate and the pressing plate are raised, the bakelite base is continuously rotated clockwise by 90 degrees, the metal foil waste is sucked by the vacuum chuck of the welding waste unloading station, then the waste is manually cleaned, and one process is completed, and the above process is repeated to achieve continuous operation.

[0037] In the embodiment of the present application, before the device is assembled, the lower cushion and the metal foil need to be wrapped with insulating PET polyester film to reduce the resistance of the power loop and improve the energy utilization rate of the system.

[0038] In the embodiment of the present application, the above welding step involves capacitor charging and discharging processing. Capacitor charging: in the charging circuit, the external voltage is first boosted by the transformer 17-5, then converted into direct current by the rectifier 17-3, and then the capacitor 17-2 is charged through the current-limiting resistor 17-4. After the charging reaches the predetermined voltage, the charging circuit is disconnected. Discharging processing: in the discharging circuit, the switch is turned on, the energy storage capacitor releases a large instantaneous pulse current, the copper bar conducts the discharge of the foil, the foil rapidly heats and vaporizes, a large amount of expanding gas is generated, and then a huge driving force is generated.

[0039] The above is only a preferred embodiment of the present application, and is not intended to limit the other forms of the present application. Any skilled person in the art can modify or change the above disclosed technical content into equivalent embodiments with equivalent changes. However, any simple modification, equivalent change and modification made to the above embodiments without departing from the technical solution of the present application, and in accordance with the technical essence of the present application, still falls within the protection scope of the technical solution of the present application.

Claims

1. A vehicle body rear flow gutter connection device characterized by: The workbench top is provided with an electric wood base driven by an electric mechanism to rotate intermittently by 90 degrees, and the outer side of the electric wood base is sequentially provided with a workpiece pressing station, a welding waste discharging station, a metal foil feeding station and a metal foil gluing station on the upper surface of the workbench top in a clockwise direction. The upper surface of the electric wood base is fixedly connected with four conductive copper strips at the four corners, and the four conductive copper strips are used to correspond to the four stations respectively. The upper side of the electric wood base is provided with a lifting cover plate, and the lifting cover plate is provided with positive and negative terminals which are electrically connected with the conductive copper strips corresponding to the workpiece pressing station when the lifting cover plate is lowered. The lifting cover plate is also provided with foil pressing blocks which press the metal foil on the conductive copper strips corresponding to the metal foil feeding station, the metal foil gluing station and the workpiece pressing station when the lifting cover plate is lowered. The electric wood base is made of electric wood material with good insulation, and the upper surface of the electric wood base is provided with four grooves for placing the conductive copper strips. The center of the upper surface of the electric wood base is provided with an axial vertical guide hole, and the center of the lifting cover plate is fixedly provided with a guide rod which enters the guide hole for vertical guidance when the lifting cover plate is lifted. The conductive copper strips are fixed on the electric wood base by screws. The inner side of each conductive copper strip is fixedly provided with two connecting strips which are electrically connected with the positive and negative terminals when the lifting cover plate is lowered. The connecting strips are provided with recessed circular grooves which are matched with the positive and negative terminals when the lifting cover plate is electrically connected. The metal foil is in the shape of a U letter, and the width of the U-shaped bottom is narrower than the width of the middle part. When a large instantaneous pulse current is applied, the narrow part of the metal foil rapidly vaporizes to generate a large amount of expanding gas to generate driving pressure. The middle narrow part of the metal foil is pasted with an insulating PET polyester film. The workpiece pressing station is provided with a lower pad, and the lower pad is placed on a target plate. The target plate is placed on a water channel plate, and the water channel plate is placed on the metal foil which is pressed down by a lifting plate driven by a hydraulic pump. The welding waste discharging station and the metal foil feeding station each include two vertical air cylinders, the cylinder bodies of the two vertical air cylinders are fixedly connected to the workbench top, the piston rods of the two vertical air cylinders are upwardly fixedly connected to an adapter block, two horizontal air cylinders are installed on the adapter block, the cylinder bodies of the two horizontal air cylinders are fixedly connected to the adapter block, the piston rods of the two horizontal air cylinders are toward the electric wood base and fixedly connected to an adapter rod, and a downward vacuum suction cup is installed on the adapter rod. The working method of the vehicle body rear water channel connecting device is as follows: (1) manually place the metal foil on the vacuum suction cup of the metal foil feeding station and suck it, then place the metal foil on the corresponding conductive copper strip, then lower the lifting cover plate to press the metal foil on the conductive copper strip by the foil pressing block, then raise the lifting cover plate to reset, the metal foil is light in weight and soft in material, and is adhered to the conductive copper strip under the action of a large pressing force to meet the short-term fixation; (2) rotate the electric wood base clockwise by 90 degrees, then rotate the metal foil to the metal foil gluing station, then lower the lifting cover plate to press the metal foil on the conductive copper strip by the foil pressing block, manually paste the insulating PET polyester film on the middle narrow part of the metal foil for insulation treatment, and then raise the lifting cover plate to reset.(3) Bakelite base continues to rotate 90 degrees clockwise, to reach the workpiece compression station, the metal foil is located on the water tank plate, the lifting cover plate and the pressing plate are pressed down, the connecting strip of the conductive copper strip is in electrical contact with the positive and negative terminals, the foil pressing block on the lifting cover plate completes the current loop while pressing the metal foil, and the pressing plate also provides sufficient pre-tightening force for welding. Start welding, when working, the positive and negative terminals connected with the capacitor group conduct current through the connection with the conductive copper strip, and then load short-time pulse current on the metal foil to make it heat up and vaporize rapidly, generate driving force to drive the water tank plate to impact the target plate and achieve welding; (4) After welding, the lifting cover plate and the pressing plate are raised, the vacuum suction cup of the welding waste unloading station lifts the metal foil waste, and the waste is manually cleaned to complete a process. After that, repeat the above process to achieve continuous operation.

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