Metal plate connecting or forming device and method based on aluminum foil electric explosion impact force

Abstract

The invention discloses a metal plate connecting or forming device and method based on aluminum foil electric explosion impact force, and relates to the technical field of high-speed forming and connecting of the metal plate machining technology, and the device comprises an upper pressing block, a lower insulating block, a base plate, an objective table and an impact force transmission block; an objective table is slidably arranged on the base plate; the lower insulation block is arranged on the base plate, a working cavity is formed in the lower insulation block, the impact force transmission block is placed in the working cavity, and an aluminum foil is placed at the top of the lower insulation block and connected with a pulse current discharge system; a supporting cantilever is installed on one side of the base plate, and the upper pressing block is arranged on the supporting cantilever. According to the aluminum foil electric explosion impact device, an original aluminum foil electric explosion impact device is improved, a machined metal plate can be better in forming quality or connecting quality, the surface of the plate can be kept clean, environmental pollution is reduced, and green production is achieved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of high-rate forming and joining technology of sheet metal processing technology, in particular to a kind of sheet metal connecting or forming device and method based on aluminum foil electric explosion impact force. BACKGROUND

[0002] High-rate forming and joining technology is mainly applied to metal materials, which makes metal plastic deformation at a very high strain rate by applying huge energy (such as explosion impact, electromagnetic induction, etc.) to metal materials in a short time. Studies have shown that high-rate deformation process can improve the forming limit of metal sheet and significantly reduce the forming difficulty and deformation springback of difficult-to-deform materials. High-rate joining technology has unique advantages in joining dissimilar metal materials due to the characteristics of no heat-affected zone and less intermetallic compound formation. Using metal foil electric explosion phenomenon to process metal materials is one of the popular research directions of high-rate forming and joining technology. This method applies a large pulse current to the metal foil, which is heated and vaporized in a short time and expands rapidly, generating a driving force of several GPa, forming a strong mechanical impact. Based on this, the metal sheet to be processed is placed on one side of the metal foil, and the driving force can be used to realize the forming or joining of the metal sheet.

[0003] However, the existing aluminum foil electric explosion impact forming technology or aluminum foil electric explosion impact joining technology has two main problems: first, during the processing implementation, the impact force generated by the aluminum foil electric explosion can be directly loaded on the metal sheet, but as the sheet deforms, the vaporized aluminum foil will gradually expand freely in all directions, resulting in a weakening of the impact force in the processing direction; second, the temperature of the aluminum foil during vaporization is very high, which can easily ablate the surface of the metal sheet in contact, causing damage to the surface of the workpiece. In addition, the dust generated after the aluminum foil electric explosion, if not treated, will also pollute the environment and harm the human body. The above problems greatly limit the application and development of aluminum foil electric explosion impact technology in industry. SUMMARY

[0004] The purpose of the present application is to provide a kind of sheet metal connecting or forming device and method based on aluminum foil electric explosion impact force, to solve the problems existing in the prior art, place impact force transmission block between aluminum foil and metal sheet, and apply driving force to metal sheet through impact force transmission block, avoid direct contact between aluminum foil and metal sheet, keep the surface of sheet clean;Utilize the cylindrical cavity with a certain depth, so that the aluminum foil can only expand along the processing direction after vaporization, realize the directional loading of impact force, avoid the free expansion of gas in all directions to cause the weakening of impact force;By improving the original aluminum foil electric explosion impact device, the processed metal sheet can have better forming quality or joining quality, and the surface of the sheet can also be kept clean, reduce environmental pollution, and realize green production.

[0005] To achieve the above object, the present application provides the following scheme: the present application provides a metal plate connecting or forming device based on aluminum foil electric explosion impact force, comprising an upper pressing block, a lower insulating block, a base plate, a carrier and an impact force transmission block; the carrier is slidably arranged on the base plate, and the carrier is used for placing a metal plate to be connected or formed; the lower insulating block is arranged on the base plate, and the bottom position of the lower insulating block is higher than the height of the top of the carrier on which the metal plate to be connected or formed is placed; a working cavity is formed in the upper surface of the lower insulating block, and the impact force transmission block is placed in the working cavity; an aluminum foil is placed on the top of the lower insulating block, and the aluminum foil is connected with a pulse current discharge system; a supporting cantilever is installed on one side of the base plate, the upper pressing block is arranged on the supporting cantilever, and the position of the supporting cantilever can be adjusted up and down; the supporting cantilever is correspondingly arranged on the top of the lower insulating block.

[0006] In an embodiment, the base plate and the supporting cantilever are both made of stainless steel material, and the base plate and the supporting cantilever are combined into one body by welding; four counterbores are processed on the bottom of the base plate, and the counterbores are used for cooperating with bolts of the insulating block to fix the lower insulating block.

[0007] In an embodiment, a guide rail is arranged on the base plate, and the carrier is driven to move along the guide rail by a servo motor or a pneumatic element.

[0008] In an embodiment, copper strip placing grooves are processed at both ends of the lower insulating block, a conductive copper strip is placed in one end of the copper strip placing groove, and the other end of the conductive copper strip is connected with the pulse current discharge system through a lead wire.

[0009] In an embodiment, a cylindrical working cavity is processed in the center of the lower insulating block; an exhaust hole is further processed on the sidewall of the working cavity, the exhaust hole is connected with a gas pressure gauge, and the gas in the exhaust hole is guided to an external waste gas collection system through an exhaust pipe.

[0010] In an embodiment, an aluminum foil placing groove is milled on the upper surface of the lower insulating block, and an aluminum foil is placed in the aluminum foil placing groove; the geometric shape of the aluminum foil is wide on both sides and narrow in the middle, and the surface of the aluminum foil is coated with an insulating tape.

[0011] In an embodiment, the metal plate to be connected comprises a target plate and a flying plate, the target plate and the flying plate are sequentially and upwardly stacked on the carrier, and a gasket is further arranged outside the connecting area between the target plate and the flying plate.

[0012] In an embodiment, the object table is detachably provided with a concave die, and the metal plate to be shaped is placed on top of the concave die; and the lower half of the impact force transmission block is processed into a corresponding convex die shape.

[0013] The application also provides a metal plate connecting method based on the electric explosion impact force of aluminum foil, which is applied to the metal plate connecting or shaping device based on the electric explosion impact force of aluminum foil and includes the following steps:

[0014] Before the discharge processing, the object table is moved to a position away from the lower insulating block, and the target plate, the gasket and the flying plate are sequentially stacked upward, and then the object table is moved along the guide rail to move the metal plate to be connected to the processing position below the lower insulating block, and then the impact force transmission block is placed in the working cavity, the aluminum foil is placed on the aluminum foil placing groove, and the height of the upper pressing block is adjusted to be in contact with the lower insulating block; after the upper pressing block is in contact with the lower insulating block, the trigger switch of the pulse current discharge system is opened, the aluminum foil is electrified, the center part of the flying plate is hit against the target plate after the flying plate is driven by the impact force transmission block, and the two plates are in contact, and intense friction is generated at the collision position, and a solid phase metallurgical bonding phenomenon is generated, thereby realizing the connection of the plates.

[0015] The application also provides a metal plate connecting method based on the electric explosion impact force of aluminum foil, which is applied to the metal plate connecting or shaping device based on the electric explosion impact force of aluminum foil and includes the following steps:

[0016] Before the discharge processing, the object table is moved to a position away from the lower insulating block, and the target plate, the gasket and the flying plate are sequentially stacked upward, and then the object table is moved along the guide rail to move the metal plate to be connected to the processing position below the lower insulating block, and then the impact force transmission block is placed in the working cavity, the aluminum foil is placed on the aluminum foil placing groove, and the height of the upper pressing block is adjusted to be in contact with the lower insulating block; after the upper pressing block is in contact with the lower insulating block, the trigger switch of the pulse current discharge system is opened, the aluminum foil is electrified, the center part of the flying plate is hit against the target plate after the flying plate is driven by the impact force transmission block, and the two plates are in contact, and intense friction is generated at the collision position, and a solid phase metallurgical bonding phenomenon is generated, thereby realizing the connection of the plates.

[0017] The application has the following beneficial technical effects compared with the prior art:

[0018] The metal plate connecting or forming device and method based on aluminum foil electric explosion impact force of the application, the device comprises an upper pressing block, a lower insulating block, a base plate, a carrier and an impact force transmission block; the carrier is slidably arranged on the base plate; the lower insulating block is arranged on the base plate, a working cavity is formed in the lower insulating block, the impact force transmission block is placed in the working cavity, an aluminum foil is placed on the top of the lower insulating block, and the aluminum foil is connected with a pulse current discharge system; a supporting cantilever is installed on one side of the base plate, the upper pressing block is arranged on the supporting cantilever, and the position of the supporting cantilever can be adjusted up and down; the supporting cantilever is correspondingly arranged on the top of the lower insulating block. The impact force transmission block is placed between the aluminum foil and the metal plate, a driving force is applied to the metal plate through the impact force transmission block, direct contact between the aluminum foil and the metal plate is avoided, and the surface of the plate is kept clean; the cylindrical cavity with a certain depth is used to make the aluminum foil expand only along the processing direction after vaporization, directional loading of the impact force is realized, and free expansion of the gas in all directions is avoided to reduce the impact force; through improvement of the original aluminum foil electric explosion impact device, the metal plate processed can have better forming quality or connecting quality, the surface of the plate can be kept clean, environmental pollution is reduced, and green production is realized. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments. Obviously, the drawings in the following description only constitute some embodiments of the application, and for those skilled in the art, other drawings can also be obtained from these drawings without creative labor.

[0020] Figure 1 It is a schematic diagram of the device for forming or connecting metal plates based on aluminum foil electric explosion impact force;

[0021] Figure 2 It is a working schematic diagram of the device in a processing state;

[0022] Figure 3 It is a force schematic diagram of the device for realizing fastening;

[0023] Figure 4 It is a front view of the upper pressing block;

[0024] Figure 5 It is a top view of the upper pressing block;

[0025] Figure 6 It is a front view of the lower insulating block;

[0026] Figure 7 It is a top view of the lower insulating block;

[0027] Figure 8 It is a bottom view of the base plate;

[0028] Figure 9 Schematic diagram of the geometry of the aluminum foil for electric explosion;

[0029] Figure 10 Front view of the impact force transmission block;

[0030] Figure 11 Effect picture of TA1 hemispherical piece forming in example one;

[0031] Figure 12 Effect picture of 6061 aluminum plate and DP600 steel plate connection in example two;

[0032] In the figure:

[0033] 1, hydraulic conduit; 2, sealing plug; 3, support cantilever; 4, upper pressing block; 5, aluminum foil; 6, impact force transmission block; 7, exhaust pipe; 8, air pressure gauge; 9, flying plate; 10, gasket; 11, target plate; 12, object table; 13, guide rail; 14, lower insulating block; 14-1, copper strip placing groove; 14-2, working cavity; 14-3, aluminum foil placing groove; 14-4, exhaust hole; 15, base plate; 16, insulating block tightening bolt; 17, copper strip tightening bolt; 18, conductive copper strip; 19, hydraulic system; 20, waste gas collection system; 21, pulsed current discharge system; 21-1, energy storage capacitor; 21-2, trigger switch. DETAILED DESCRIPTION

[0034] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0035] The purpose of the present application is to provide a metal plate connecting or forming device and method based on aluminum foil electric explosion impact force, to solve the problems existing in the prior art. The impact force transmission block is placed between the aluminum foil and the metal plate, and the driving force is applied to the metal plate through the impact force transmission block, so as to avoid direct contact between the aluminum foil and the metal plate, and keep the surface of the plate clean. The cylindrical cavity with a certain depth is used to make the aluminum foil vaporize and expand only along the processing direction, so as to realize directional loading of the impact force and avoid free expansion of the gas in all directions, which causes the impact force to weaken. By improving the original aluminum foil electric explosion impact device, the processed metal plate can have better forming quality or connecting quality, and the surface of the plate can also be kept clean, the environmental pollution is reduced, and green production is realized.

[0036] In order to make the above-mentioned purposes, characteristics and advantages of the present application more obvious and easy to understand, the present application will be further described in detail below with reference to the drawings and specific embodiments.

[0037] As shown in Figures 1-12 The present application provides a metal plate connecting or forming device based on aluminum foil electric explosion impact force, which comprises an upper pressing block 4, a lower insulating block 14, a base plate 15, a carrier table 12 and an impact force transmission block 6; the carrier table 12 is slidably arranged on the base plate 15, and the carrier table 12 is used for placing the metal plate to be connected or formed; the lower insulating block 14 is arranged on the base plate 15, and the bottom position of the lower insulating block 14 is higher than the height of the top of the carrier table 12 on which the metal plate to be connected or formed is placed; a working cavity is formed in the lower insulating block 14, the impact force transmission block 6 is placed in the working cavity 14-2, the aluminum foil 5 is placed on the top of the lower insulating block 14, and the aluminum foil 5 is connected with the pulse current discharge system 21; a support cantilever 3 is installed on one side of the base plate 15, the upper pressing block 4 is arranged on the support cantilever 3, and the up-and-down position of the support cantilever 3 is adjustable; the support cantilever 3 is correspondingly arranged on the top of the lower insulating block 14; the position of the carrier table 12 on the guide rail 13 can be controlled by a servo motor or a pneumatic element.

[0038] Copper strip placing grooves 14-1 are machined at both ends of the lower insulating block 14 to place the conductive copper strips 18, and the bolt connection of the two is realized through the copper strip tightening bolts 17. A cylindrical working cavity 14-2 is machined in the center of the lower insulating block 14 to place the impact force transmission block 6; an exhaust hole 14-4 is also machined on the sidewall of the working cavity 14-2, which is connected with the air pressure gauge 8 and guided to the external waste gas collection system 20 by the exhaust pipe 7.

[0039] A shallow aluminum foil placing groove 14-3 is milled on the upper surface of the lower insulating block 14 to place the aluminum foil 5. The conductive copper strips 18 are used for the loop connection of the aluminum foil 5 and the pulse current discharge system 21, wherein the conductive copper strips 18 are in direct contact with the aluminum foil 5, and are connected with the pulse current discharge system 21 through a lead wire. Before discharge processing, the carrier table 12 is moved to a position away from the lower insulating block 14, and the target plate 11, the gasket 10 and the flyer plate 9 are sequentially stacked upwards, then the carrier table 12 is moved along the guide rail 13 to move the plate to be processed to the processing position below the lower insulating block 14, then the impact force transmission block 6 is placed in the working cavity 14-2, the aluminum foil 5 is placed on the aluminum foil placing groove 14-3, and finally the height of the upper pressing block 4 is adjusted to be in close contact with the lower insulating block 14.

[0040] In this embodiment, further, the combination of the hydraulic conduit 1, the sealing plug 2, the support cantilever 3, the upper pressing block 4 and the hydraulic system 19 can realize the fastening of the tooling. After the upper pressing block 4 is adjusted to be in close contact with the lower insulating block 14 by using the hydraulic system 19, the hydraulic pressure needs to be appropriately increased to provide a downward pre-tightening force F( Figure 3 ) for the tooling, which is used to resist the impact force generated by the aluminum foil electric explosion and ensure the stability of the overall device.

[0041] Furthermore, before connecting the hydraulic system 19 and the exhaust gas collection system 20, the sealing of the hydraulic conduit 1 and the exhaust pipe 7 should be checked respectively.

[0042] Furthermore, before tooling assembly, the aluminum foil 5 needs to be wrapped with insulating tape to reduce the resistance of the power-conducting circuit and improve the energy utilization rate of the system. The part of the conductive copper strip 18 exposed on the outside of the lower insulating block 14 is also wrapped with insulating tape. At the same time, when connecting the lead wire of the pulse current discharge system 21, the terminals must be pressed tightly to prevent electric sparks.

[0043] Furthermore, the geometry of the lower half of the impact force transmission block 6 can be changed, such as... Figure 10 The impact force transmission block 6 shown has a spherical lower surface. The impact force transmission block 6 itself needs sufficient rigidity and can be made of metal materials such as titanium or steel, or other materials such as epoxy resin or bakelite. The upper part of the impact force transmission block 6 is cylindrical, with its upper circular plane fitting against the aluminum foil 5. The lower part can be processed into different shapes according to actual conditions and fitted against the metal sheet. Its outer diameter and the inner diameter of the working cavity 14-2 of the lower insulating block 14 should meet the clearance fit assembly relationship. The aluminum foil 5 has a geometry that is wide on both sides and narrow in the middle. Its surface needs to be covered with polyimide tape for insulation treatment to reduce circuit resistance and other unnecessary external factors.

[0044] Furthermore, Figure 1 The assembly sequence of the device shown above mainly takes "plate connection" as an example. The specific assembly sequence and usage method are as follows: First, use the insulating block tightening bolt 16 to fix the lower insulating block 14 to the base plate 15, and fix the conductive copper strip 18 to the lower insulating block 14; then connect the conductive copper strip 18 to the pulse current discharge system 21 through the lead wire to form a circuit, connect the hydraulic system 19 through the hydraulic conduit 1 and adjust the upper pressure block 4 to the highest position, connect the exhaust gas collection system 20 through the exhaust pipe 7 and ensure that the air path is unobstructed; then, stack the target plate 11, the gasket 10, and the flying plate 9 on the platform 12 in sequence, move the platform 12 to below the lower insulating block 14, and put the impact force transmission block 6 into the working cavity 14-2 of the lower insulating block 14, and place the aluminum foil 5 on top of the impact force transmission block 6; finally, adjust the height of the upper pressure block 4 to fit with the lower insulating block 14, so that the two ends of the aluminum foil 5 are in close contact with the conductive copper strips 18 on both sides and the tooling is fastened. The connection principle is as follows: when the flying plate 9 is driven by the impact force transmission block 6, due to the presence of the gasket 10, the central part of the flying plate 9 will hit the target plate 11 with a certain impact speed and impact angle. After the two plates come into contact, they will generate intense friction at the collision point and produce a solid-state metallurgical bonding phenomenon, thereby realizing the connection of the plates.

[0045] Further, to make the device achieve the function of "plate forming", only need to replace the flying plate 9, gasket 10 and target plate 11 above the object table 12 with corresponding metal plates and concave dies, and then process the lower half of the impact force transmission block 6 into a corresponding convex die shape, so as to achieve the purpose of "plate forming".

[0046] The hydraulic system 19, the exhaust gas collection system 20 and the pulse current discharge system 21 are all existing and mature products, which can be directly used after being connected with the processing platform. The hydraulic system 19 can directly apply pre-tightening force to the tooling to prevent the gas from expanding upward. The exhaust gas collection system 20 can directly absorb and concentrate the aluminum dust into a box, which is convenient for subsequent secondary recycling. The parameter selection range of the pulse current discharge system 21 is: the capacity of the energy storage capacitor 21-1 is 10-1000 mu F, the discharge voltage is 3-20 kV, and the discharge current peak value is greater than or equal to 80 kA.

[0047] The metal plate connecting or forming device and method based on aluminum foil electric explosion impact force of the application can apply a large instantaneous pulse current to the aluminum foil 5 to rapidly heat and vaporize the aluminum foil 5. The formed gas expands along a specific direction inside the lower insulation block 14, and the impact force of the gas expansion is concentrated on the metal plate by the impact force transmission block 6, so as to realize the deformation or connection of the metal plate. The combination of the lower insulation block 14 and the impact force transmission block 6 realizes the directional loading of the aluminum foil electric explosion impact force, solves the problem of free expansion of the gas in all directions in the previous aluminum foil electric explosion technology, and weakens the impact force. At the same time, the driving force is applied to the metal plate by the impact force transmission block 6, which can effectively prevent the metal plate to be processed from being ablated by high-temperature gas and keep the surface of the plate clean. The device structure of the application is reasonable in design and convenient to operate, and can fully meet the operation requirements of the method.

[0048] The application provides a metal plate connecting method based on aluminum foil electric explosion impact force, which comprises the following steps:

[0049] Step 1: before the discharge processing, the object table 12 is moved to a position away from the lower insulation block 14, and the target plate 11, the gasket 10 and the flying plate 9 are sequentially stacked upwards, the flying plate 9 is placed above the target plate 11, the impact force transmission block 6 is placed above the flying plate 9, and the aluminum foil 5 is placed above the impact force transmission block 6; then the object table 12 is moved along the guide rail 13 to move the metal plate to be connected to the processing position below the lower insulation block 14, then the impact force transmission block 6 is placed in the working cavity 14-2, the aluminum foil 5 is placed on the aluminum foil placing groove 14-3, the height of the upper pressing block 4 is adjusted to be in close contact with the lower insulation block 14, the height of the upper pressing block 4 is adjusted to fix the aluminum foil 5 and apply pre-tightening force.

[0050] Step 2: the air suction function of the exhaust gas collection system 20 is started to ensure that the aluminum dust can be absorbed at any time.

[0051] Step 3, check the line connection state of the discharge circuit, and the circuit is in the on state to carry out the charging and discharging operation.

[0052] Step 4, the energy storage capacitor 21-1 of the pulse current discharge system 21 needs to be charged before discharging, and the trigger switch 21-2 is closed after the charging is completed. The aluminum foil 5 is subjected to a pulse large current through the conductive copper strip 18. The aluminum foil 5 is electrified. After the flying plate 9 is driven by the impact force transmission block 6, the center part of the flying plate 9 will hit the target plate 11. After the two plates are in contact, intense friction occurs at the collision position, and a solid phase metallurgical bonding phenomenon occurs, thereby realizing the connection of the plate material.

[0053] Step 5, after the discharge is completed, the moving worktable 12 is moved to take out the connecting piece of the metal plate.

[0054] The application proposes a metal plate forming method based on aluminum foil electric explosion impact force, which comprises the following steps:

[0055] Step 1, before the discharge processing, the moving worktable 12 is moved to a position away from the lower insulating block 14, and the concave die and the to-be-formed metal plate are sequentially stacked upwards. The non-forming area of the metal plate is respectively padded with heat insulation pads upwards and downwards. The impact force transmission block 6 is placed above the to-be-formed metal plate. The aluminum foil 5 is placed above the impact force transmission block 6. Then the moving worktable 12 is moved along the guide rail 13 to move the to-be-connected metal plate to the processing position below the lower insulating block 14. Then the impact force transmission block 6 is placed in the working cavity 14-2. The aluminum foil 5 is placed on the aluminum foil placing groove 14-3. The height of the upper pressing block 4 is adjusted to be in close contact with the lower insulating block 14. The height of the upper pressing block 4 is adjusted to fix the aluminum foil 5 and apply a pre-tightening force.

[0056] Step 2, the air suction function of the waste gas collection system 20 is started to ensure that the aluminum dust can be absorbed at any time.

[0057] Step 3, check the line connection state of the discharge circuit, and the circuit is in the on state to carry out the charging and discharging operation.

[0058] Step 4, the energy storage capacitor 21-1 of the pulse current discharge system 21 needs to be charged before discharging, and the trigger switch 21-2 is closed after the charging is completed. The aluminum foil 5 is subjected to a pulse large current through the conductive copper strip 18. The aluminum foil 5 is electrified. After the flying plate 9 is driven by the impact force transmission block 6, the center part of the flying plate 9 will hit the target plate 11. After the two plates are in contact, intense friction occurs at the collision position, and a solid phase metallurgical bonding phenomenon occurs, thereby realizing the connection of the plate material.

[0059] Step 5, after the discharge is completed, the moving worktable 12 is moved to take out the connecting piece of the metal plate.

[0060] Example one

[0061] Figure 11The shown is a hemispherical part processed from a titanium alloy sheet TA1 with a size of 100mm*100mm*1mm, and the traditional stamping method is prone to springback and low forming efficiency when processing the part, and the aluminum foil electric explosion impact technology can efficiently process the part and effectively reduce the springback. However, if the impact force of the aluminum foil electric explosion is directly applied to the surface of the titanium plate when processing the part, there are problems such as poor mold adhesion and surface ablation of the workpiece. The surface of the TA1 titanium alloy hemispherical part formed by the method of the present application has no ablation marks, good mold adhesion, small springback, and meets the use requirements.

[0062] Example two

[0063] Figure 12 The shown is a connecting piece of a 100mm*50mm*1mm 6061 aluminum plate and a 100mm*50mm*1mm DP600 high-strength steel plate. In order to meet the demand of lightweight of automobile body, the cover part of the automobile body will select a steel material with higher strength such as DP600, and the automobile body framework will select a 6061 aluminum with lighter weight. The industry often uses resistance spot welding to realize the connection of the two. When the number of resistance welding spots increases, the current shunting phenomenon occurs between the combined plate pieces, which causes the welding core size to be reduced and further affects the connection quality, which is not conducive to the subsequent position welding. The connection method of the present application can effectively avoid the above situation, make the welding core size of each welding spot close, and keep the workpiece surface clean, which can ensure the overall connection quality of the cover part and the automobile body.

[0064] The metal plate connecting or forming device and method based on aluminum foil electric explosion impact force of the present application places an impact force transmission block 6 between the aluminum foil 5 and the metal plate, and applies a driving force to the metal plate through the impact force transmission block 6, avoids direct contact between the aluminum foil 5 and the metal plate, and keeps the plate surface clean. The working cavity 14-2 with a certain depth in a cylindrical shape is used to make the aluminum foil 5 vaporize and expand only in the processing direction, realize directional loading of the aluminum foil electric explosion impact force, avoid free expansion of the gas in all directions to cause the impact force to weaken, and improve the energy utilization rate. At the same time, a separate exhaust hole 14-4 is processed on the sidewall of the cylindrical working cavity 14-2, which is used to collect waste gas and prevent aluminum dust from spreading to the external environment; a special exhaust channel is designed to collect aluminum dust and reduce environmental pollution. The position of the plate to be processed is moved by using the object carrier 12 and the guide rail 13, which is convenient to take and place. The hydraulic mechanism is used to realize the fastening of the tooling, avoid complicated and repeated bolt connection, and is simple to operate. The impact force transmission block 6 is used to effectively avoid the ablation of the plate surface and ensure the surface quality of the workpiece. Through the improvement of the original aluminum foil electric explosion impact device, the metal plate processed has better forming quality or connection quality, and the plate surface is kept clean, the environmental pollution is reduced, and the green production is realized.

[0065] It is apparent that a person skilled in the art can, without departing from the scope of the application, make many modifications to the details of the above-described exemplary embodiments, and that such modifications fall within the scope of the application. Therefore, the examples should be considered as exemplary and in no way limit the scope of the application, which is defined by the claims that follow, and not by the above description. Any reference signs in the claims should not be construed as limiting the claims concerned.

[0066] The above examples are illustrative of specific embodiments of the present application, and are not intended to limit the scope of the present application. Rather, reference should be made to the appended claims, which fully indicate the scope of the present application, wherein numerous variations to the details described can be made. It is expressly intended that all such variations that are within the scope of the present application be embraced by the claims.

Claims

1. A metal sheet connection or forming device based on the electric explosion impact force of aluminum foil, characterized in that: The system includes an upper pressure block, a lower insulating block, a base plate, a platform, and an impact force transmission block. The platform is slidably mounted on the base plate and is used to place metal sheets to be connected or formed. The lower insulating block is mounted on the base plate, with its bottom position higher than the top of the platform on which the metal sheets are placed. A working cavity is formed on the lower insulating block, and the impact force transmission block is placed inside the working cavity. An aluminum foil is placed on top of the lower insulating block and is connected to a pulse current discharge system. A support cantilever is mounted on one side of the base plate, and the upper pressure block is mounted on the support cantilever. The vertical position of the support cantilever is adjustable. The support cantilever is correspondingly positioned on top of the lower insulating block.

2. The metal sheet connection or forming device based on the electro-explosive impact force of aluminum foil according to claim 1, characterized in that: Both the base plate and the support cantilever are made of stainless steel and are welded together as one unit. The bottom of the base plate has four countersunk holes, which are used to engage with the tightening bolts of the insulating block to fix the lower insulating block.

3. The metal sheet connection or forming device based on the electro-explosive impact force of aluminum foil according to claim 1, characterized in that: The base plate is equipped with guide rails, and the platform is driven to move along the guide rails by a servo motor or pneumatic components.

4. The metal sheet connection or forming device based on the electro-explosive impact force of aluminum foil according to claim 1, characterized in that: The lower insulating block has copper strip placement grooves at both ends. One end of the conductive copper strip is placed in the copper strip placement groove, and the other end of the conductive copper strip is connected to the pulse current discharge system through a lead wire.

5. The metal sheet connection or forming device based on the electro-explosive impact force of aluminum foil according to claim 1, characterized in that: The lower insulating block has a cylindrical working cavity machined in its center; an exhaust hole is also machined on the side wall of the working cavity, the exhaust hole is connected to a pressure gauge, and the gas from the exhaust hole is guided to an external waste gas collection system through an exhaust pipe.

6. The metal sheet connection or forming device based on the electro-explosive impact force of aluminum foil according to claim 1, characterized in that: The upper surface of the lower insulating block is milled with an aluminum foil placement groove, and the aluminum foil is placed in the aluminum foil placement groove; the geometric shape of the aluminum foil is wide on both sides and narrow in the middle, and the surface of the aluminum foil is covered with insulating tape.

7. The metal sheet connection or forming device based on the electro-explosive impact force of aluminum foil according to claim 1, characterized in that: The metal plates to be connected include a target plate and a fly plate. The target plate and the fly plate are stacked on the platform in sequence. A gasket is also provided outside the connection area between the target plate and the fly plate.

8. The metal sheet connection or forming device based on the electro-explosive impact force of aluminum foil according to claim 1, characterized in that: The platform is detachably equipped with a concave mold, and the metal sheet to be formed is placed on top of the concave mold; the lower half of the impact force transmission block is processed into the corresponding punch shape.

9. A method for joining metal sheets based on the electric explosion impact force of aluminum foil, applied to the metal sheet joining or forming device based on the electric explosion impact force of aluminum foil as described in claim 7, characterized in that, Includes the following steps: Before electrical discharge machining, the stage is moved away from the lower insulating block, and the target plate, gasket, and fly plate are stacked upward in sequence. Then, the stage is moved along the guide rail to the machining position below the lower insulating block. Subsequently, the impact force transmission block is placed in the working cavity, aluminum foil is placed on the aluminum foil placement groove, and the height of the upper pressure block is adjusted to fit with the lower insulating block. After the upper pressure block and the lower insulating block are properly attached, the trigger switch of the pulse current discharge system is turned on, the aluminum foil is energized, and the flying plate is driven by the impact force transmission block. The center part of the flying plate will collide with the target plate. After the two plates come into contact, they will generate intense friction at the collision point and produce a solid-state metallurgical bonding phenomenon, thereby achieving the connection of the plates.

10. A method for forming metal sheets based on the electric explosion impact force of aluminum foil, applied to the metal sheet connecting or forming device based on the electric explosion impact force of aluminum foil as described in claim 8, characterized in that, Includes the following steps: Before electrical discharge machining, the stage is moved away from the lower insulating block, and the die and the metal sheet to be formed are stacked on top of each other in sequence. Then, the stage is moved along the guide rail to the processing position below the lower insulating block. Then, the impact force transmission block is placed in the working cavity, the aluminum foil is placed on the aluminum foil placement groove, and the height of the upper pressure block is adjusted to fit with the lower insulating block. After the upper pressure block and the lower insulating block are in place, the trigger switch of the pulse current discharge system is turned on, the aluminum foil is energized, and the impact force transmission block, which is processed into the corresponding punch shape in the lower half, impacts the metal plate on the top of the die, thereby realizing the forming of the metal plate.

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