Metal plate coil-free electromagnetic forming device
By using a coilless electromagnetic forming device, the electromagnetic repulsion between the metal sheet and the induction block is utilized for forming, which solves the problems of easy damage and high cost of coils, and realizes low-cost and high-efficiency metal sheet forming.
Patent Information
- Application Number
- CN202422522634.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-17
- Publication Date
- 2026-01-13
- Estimated Expiration
- 2034-10-17
AI Technical Summary
Existing electromagnetic forming devices have high coil manufacturing and processing costs, are easily affected by induced current and current heating effects, have short service life, and are prone to arcing at the joints, which can damage the equipment.
The design employs a coilless approach, directly applying pulsed current to the metal sheet to allow it to interact with the eddy current magnetic field generated by the induction block. This interaction utilizes electromagnetic repulsion to achieve the desired shape, thus avoiding damage to the coil. Copper conductive connectors are used to connect the metal sheet.
It reduces production and maintenance costs, decreases heating costs, improves the plasticity and forming efficiency of metal sheets, and avoids the dangers of sparking.
Smart Images
Figure CN223789371U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of electromagnetic technology, specifically to a coilless electromagnetic forming device for metal plates. Background Technology
[0002] In the manufacturing sector, lightweighting is a significant trend in industry development. Lightweighting is primarily reflected in two aspects: structural design and material selection. Lightweight materials, such as alloys of aluminum, magnesium, and titanium, have very low density, which can significantly reduce the weight of workpieces while still meeting the strength requirements of the workpiece structure through alloying processes. Furthermore, the emergence of new composite materials with high specific strength and light weight in recent years is also an important direction for the development of lightweight materials.
[0003] Electromagnetic forming, as a multi-field coupled forming method, has brought new breakthroughs to precision forming and manufacturing in the aerospace field in recent years. Electromagnetic forming technology is a highly efficient forming technology, offering advantages over traditional thermal processing, such as low energy consumption, high thermal efficiency, and rapid heating, meeting the requirements of modern green production. This process can effectively improve the forming performance of sheet metal, control the springback of sheet metal during forming, and has a high forming rate (10⁻⁶). 3 ~10 4 s 1 It has many advantages, such as precise control of the forming process, good part adhesion to the mold, and high surface quality of the formed parts.
[0004] Currently, traditional electromagnetic forming devices use coil forming, which involves generating a strong magnetic field around the coil. The highly conductive sheet material, under the influence of this strong magnetic field, generates an induced current and eddy current magnetic field. The strong magnetic field generated by the coil interacts with the eddy current magnetic field generated by the sheet material, producing eddy current force. Under the influence of this eddy current force, the sheet material undergoes deformation stages such as bulging and molding to adhere to the surface of the forming mold, thus achieving the final shape. However, existing forming devices have the following problems: the manufacturing and processing costs of the coil are high; during the forming process, the discharge coil is affected by the electromagnetic reaction force generated by the induced current and the current heating effect, causing deformation and failure, affecting the normal use of the coil, resulting in a short coil lifespan and high production costs; furthermore, arcing is prone to occur at the coil joints, which can damage the equipment.
[0005] Therefore, it is necessary to improve existing technologies. Summary of the Invention
[0006] The purpose of this invention is to address the shortcomings of existing technologies by providing a coilless electromagnetic forming device and method for metal plates, aiming to reduce production costs.
[0007] The technical solution adopted in this utility model is as follows: a coilless electromagnetic forming device for metal plates, comprising a base, a punch, a height adjustment mechanism, a clamping assembly, a metal plate to be formed, and an induction block; the base is hollow inside, and a horizontal base plate is provided on the top; the punch is placed on the base plate; the lower end of the height adjustment mechanism is connected to the base, and the upper end of the height adjustment mechanism is connected to the clamping assembly; the metal plate to be formed is placed above the punch; both ends of the metal plate to be formed are clamped by the clamping assembly; both ends of the metal plate to be formed are connected to an external current through wires to form a circuit; the induction block is arranged above the metal plate to be formed.
[0008] According to the above scheme, the height adjustment mechanism includes a base plate, a lifting drive component, and four support components arranged at the four corners of the base plate;
[0009] The base plate and the lifting drive are both located inside the base. The driving end of the lifting drive is connected to the upper part of the base plate. The lower end of the support is connected to the base plate, and the upper end of the support extends out of the base plate and is connected to the pressing assembly.
[0010] According to the above scheme, the lifting drive component is a jack.
[0011] According to the above scheme, the device is also provided with a limiting plate; the limiting plate has a limiting hole in the middle that is adapted to the punch; the two sides of the limiting plate are respectively connected to the upper end of the support member.
[0012] According to the above scheme, the pressing component includes a pressing block and a pad that are aligned vertically; the edge of the metal sheet to be formed is clamped between the pressing block and the pad.
[0013] According to the above scheme, the clamping assembly is located on the upper part of the limiting plate, and the pressing block, the metal sheet to be formed, the pad block and the limiting plate are connected by bolts.
[0014] According to the above scheme, the base includes a rectangular frame structure formed by multiple connecting rods; the substrate is fixed on the top of the rectangular frame structure.
[0015] According to the above scheme, the support component includes a screw and a spring; the screw is arranged vertically, and the lower end of the screw is connected to the base plate located inside the base; the upper end of the screw passes through the base plate and is connected to the limiting plate through the screw; a spring is sleeved on the screw between the base plate and the limiting plate.
[0016] According to the above scheme, conductive connectors are overlapped at both ends of the metal sheet to be formed, and the conductive connectors at both ends are connected to the power source through wires to form a circuit.
[0017] According to the above scheme, the conductive connector is made of copper sheet.
[0018] The beneficial effects of this utility model are as follows:
[0019] 1. This utility model does not use a coil. It directly applies a pulse current to the metal sheet to be formed. The strong magnetic field of the metal sheet interacts with the eddy current magnetic field generated by the induction block to generate a mutually repulsive electromagnetic force, thereby forming the metal sheet. Compared with the prior art, there is no problem of coil damage, which simplifies the processing equipment and reduces the production and maintenance costs.
[0020] 2. This utility model simultaneously applies electricity directly to the metal sheet to be formed. Due to the thermal effect of the current, the heating cost of the metal sheet will be reduced, saving energy. The charged metal sheet will produce an electroplastic effect, which will reduce its deformation resistance and increase its plasticity, which is beneficial to the forming of the metal sheet. This reduces the forming difficulty of the sheet.
[0021] 3. This utility model uses a conductive connector made of copper sheet to be placed on the metal plate to be formed. Without damaging the structure of the metal plate itself, it can connect the metal plate to the wire and avoid the hazards caused by arcing. Attached Figure Description
[0022] Figure 1 This is a schematic diagram of the overall implementation of this embodiment.
[0023] Figure 2 This is a top view of this embodiment.
[0024] Figure 3 This is a schematic diagram of the current circuit and electromagnetic force of the induction block and the metal sheet to be formed.
[0025] Figure 4 This is a simplified diagram of the electromagnetic repulsion force forming structure in this embodiment.
[0026] Figure 5 This is a schematic diagram of the three-dimensional structure of the punch.
[0027] Figure 6 This is a schematic diagram of the three-dimensional structure of the edge block.
[0028] Figure 7 This is a schematic diagram of the three-dimensional structure of the pad.
[0029] Figure 8 This is a schematic diagram of the three-dimensional structure of the limiting plate.
[0030] Figure 9 This is a schematic diagram of the three-dimensional structure of the base plate.
[0031] In the diagram: 1-base plate; 2-base; 3-screw; 4-punch; 5-spring; 6-limiting plate; 601-limiting hole; 7-pad; 8-pad block; 801-mounting hole; 9-pressing block; 901-rounded corner; 10-metal sheet to be formed; 11-sensor block; 12-base plate; 13-lifting drive component. Detailed Implementation
[0032] To better understand this utility model, the following detailed description is provided in conjunction with the accompanying drawings and specific embodiments.
[0033] Example
[0034] The metal sheet to be formed 10 is an arc-shaped plate with an upward arch in the middle; such as Figure 5 As shown, the punch 4 is a mold with a convex top and a flat bottom; the purpose of this device is to deform the upper arched part of the metal sheet 10 to be formed so that it fits against the upper surface of the punch 4.
[0035] like Figures 1-2 The device for forming a metal sheet without coils includes a base 2, a height adjustment mechanism, a limiting mechanism, a punch 4, a metal sheet 10 to be formed, and an induction block 11. The base 2 is hollow inside and has a horizontal base plate 12 on top. The punch 4 is placed on the base plate 12. The lower end of the height adjustment mechanism is connected to the base 2, and the upper end of the height adjustment mechanism is connected to a clamping assembly. The metal sheet 10 to be formed is a high conductivity material or a low conductivity material and is located above the punch 4. Both ends of the metal sheet 10 to be formed are clamped by the clamping assembly.
[0036] The two ends of the metal sheet 10 to be formed are connected to an external current through wires to form a circuit; the sensing block 11 is arranged above the metal sheet 10 to be formed (that is, on the outside of the metal sheet 10 to be formed).
[0037] In this invention, initially, the metal sheet 10 to be formed is brought into contact with the top of the punch 4; during the forming process, the middle part of the metal sheet 10 to be formed is deformed and fits against the upper surface of the punch 4.
[0038] Preferably, the height adjustment mechanism includes a base plate 1, a lifting drive component 13, and four support components arranged at the four corners of the base plate 1;
[0039] The base plate 1 and the lifting drive component 13 are both located inside the base 2. The driving end of the lifting drive component 13 is connected to the upper part of the base plate 1. The lower end of the support component is connected to the base plate 1, and the upper end of the support component extends out of the base plate 12 and is connected to the pressing assembly.
[0040] In this invention, the lifting drive component 13 is a jack; the base plate 1 is a horizontally arranged steel plate, such as... Figure 9 As shown.
[0041] In this embodiment, there are four support members, arranged in pairs on both sides of the base 2. There are two clamping assemblies, which clamp and fix the two sides of the metal sheet 10 to be formed respectively; the clamping assemblies are connected to the two support members on the same side.
[0042] Preferably, the device further includes a limiting plate 6; the limiting plate 6 has a limiting hole 601 in the middle that matches the punch 4, such as... Figure 8 As shown; the two sides of the limiting plate 6 are respectively connected to the upper end of the support member.
[0043] Preferably, the clamping assembly includes an upper and lower aligned clamping block 9 and a pad block 8 (e.g., ...). Figure 6 and Figure 7 (As shown); the edge of the metal sheet 10 to be formed is held between the pressing block 9 and the pad block 8.
[0044] In this invention, the clamping assembly is located on the upper part of the limiting plate 6, and the pressing block 9, the metal sheet to be formed 10, the pad block 8, and the limiting plate 6 are connected by bolts. Specifically, the limiting plate 6 has first mounting holes at its four corners; the pressing block 9 and the pad block 8 have second mounting holes at their front and rear ends corresponding to the first mounting holes on the same side, respectively. The pressing block 9, the pad block 8, and the limiting plate 6 are locked together by connecting bolts and connecting nuts that pass through the first mounting holes and the second mounting holes from bottom to top. A pad plate 7 can also be introduced between the limiting plate 6 and the pad block 8.
[0045] In this embodiment, the lower part of the inner end of the pressure block 9 (the end near the punch 4) is provided with a rounded corner.
[0046] Preferably, the base 2 includes a rectangular frame structure formed by multiple connecting rods; the base plate 12 is fixed to the top of the rectangular frame structure.
[0047] In this invention, the rectangular frame structure is a steel structure.
[0048] Preferably, the support includes a screw 3 and a spring 5; the screw 3 is arranged vertically, and the lower end of the screw 3 is connected to the base plate 1 located inside the base 2; the upper end of the screw 3 extends out of the base plate 12 and is connected to the limiting plate 6 through the screw 3; the spring 5 is sleeved on the screw 3 between the base plate 12 and the limiting plate 6.
[0049] In this invention, the position of the screw 3 is adjusted using a jack based on the height of the punch 4: when the jack applies downward pressure, the base plate 1 moves the screw 3 downward, the spring 5 is compressed, and the pad 8 moves downward accordingly, simultaneously causing the metal sheet 10 to be formed to move downward; when the jack releases the pressure, the base plate 1 moves the screw 3 upward, the spring 5 returns to its original state, and the upper pad 8 moves the metal sheet 10 to be formed upward. During this process, the punch 4 remains fixed to the base 2, thereby achieving the adjustment of the relative position between the metal sheet 10 to be formed and the punch 4.
[0050] In this embodiment, conductive connectors are respectively attached to both ends of the metal sheet 10 to be formed, and the conductive connectors at both ends are connected to the power supply through wires to form a circuit; specifically, the inner end of the conductive connector overlaps with the end of the metal sheet 10 to be formed, and the clamping component clamps the overlapping part of the two. The outer end of the conductive connector (that is, the end away from the metal sheet 10 to be formed) is opened with a through hole, and the wire is connected to the through hole through bolts and nuts (an insulating pad 7 is provided between the nut and the conductive connector).
[0051] In this embodiment, the conductive connector 801 is made of copper sheet. By using the conductive connector 801 made of copper sheet on the metal plate 10 to be formed, not only can the metal plate and the wire be connected well without damaging the structure of the metal plate 10 itself, but also the hazards caused by arcing can be avoided.
[0052] In this embodiment, the sensing block 11 is made of copper. The sensing block 11 is connected to a robotic arm above the device. The robotic arm moves the sensing block 11 through a clamping assembly to achieve deformation of the metal sheet 10 at different positions. This is a conventional technical method in the industry and is not an improvement of this application, so it will not be described in detail here.
[0053] In this embodiment, the metal sheet 10 to be formed can be a high-conductivity material such as aluminum alloy AA5052, or a low-conductivity material such as titanium alloy TC4. The method of forming with an induction block can improve the plasticity of the material and solve the problem that conventional electromagnetic forming methods with coils at room temperature are difficult to form low-conductivity materials such as titanium alloy TC4. If the metal sheet 10 to be formed is a low-conductivity material, and severe oxidation is observed during processing, the processing environment can be designed as a sealed environment, and an inert gas can be introduced to control material oxidation.
[0054] The working principle of this utility model is as follows: The punch 4 is placed on the base plate 12 of the base 2 (the punch 4 corresponds to the position of the limiting hole in the limiting plate 6). The metal sheet 10 to be formed is fixed between the upper pads 8. The position of the upper pads 8 is adjusted by a jack, so that the metal sheet 10 to be formed is located above the punch 4 (the highest point of the punch 4 is in contact with the highest point of the lower surface of the metal sheet 10 to be formed). During electromagnetic forming, the power supply directly applies a pulsed current discharge to the metal sheet 10 to be formed, and a current I1 flows through the metal sheet 10 to generate a strong magnetic field. Under the action of the strong magnetic field, the induction block 11 generates an induced current I in the opposite direction to the current I1. 2， And generate eddy current magnetic fields, such as Figure 3 and Figure 4As shown, the strong magnetic field generated by the metal sheet 10 to be formed interacts with the eddy current magnetic field generated by the induction block 11, generating a mutually repulsive electromagnetic repulsive force F1. The metal sheet 10 to be formed deforms under the action of the electromagnetic repulsive force F1. The induction block 11 moves to various local positions of the metal to be formed according to the set trajectory. Multiple discharges gradually accumulate deformation, resulting in localized gradual deformation. Finally, it fits against the upper surface of the punch 4 to achieve forming.
[0055] The above description, in conjunction with the accompanying drawings, provides a detailed account of the embodiments of this utility model. However, this utility model is not limited to the described embodiments. For those skilled in the art, various changes, modifications, substitutions, and alterations to these embodiments without departing from the principles and spirit of this utility model will still be included within the protection scope of this utility model.
Claims
1. A coilless electromagnetic forming device for metal plates, characterized in that, The device comprises a base, a punch, a height adjusting mechanism, a pressing assembly, a metal plate to be shaped and an induction block; the base is hollow inside and is provided with a horizontal base plate on the top; the punch is placed on the base plate; the lower end of the height adjusting mechanism is connected with the base and the upper end of the height adjusting mechanism is connected with the pressing assembly; the metal plate to be shaped is arranged above the punch; the two ends of the metal plate to be shaped are pressed by the pressing assembly respectively; the two ends of the metal plate to be shaped are connected with an external current through wires to form a loop; the induction block is arranged above the metal plate to be shaped; the height adjusting mechanism comprises a bottom plate, a lifting driving element and four supporting elements arranged at the four corners of the bottom plate; The bottom plate and the lifting driving element are both located inside the base, and the driving end of the lifting driving element is connected with the upper part of the bottom plate; the lower end of the supporting element is connected with the bottom plate, and the upper end of the supporting element penetrates through the base plate and is connected with the pressing assembly; The supporting element comprises a screw rod and a spring; the screw rod is arranged vertically, and the lower end of the screw rod is connected with the bottom plate located inside the base; the upper end of the screw rod penetrates through the base plate and is connected with a limiting plate through the screw rod; the spring is sleeved on the screw rod between the base plate and the limiting plate; The bottom plate is arranged horizontally.
2. The metal sheet coil electromagnetic forming apparatus as recited in claim 1, wherein The lifting driving element is a jack.
3. The metal sheet coil electromagnetic forming apparatus as recited in claim 1, wherein The device is further provided with a limiting plate; the middle part of the limiting plate is provided with a limiting hole matched with the punch; the two sides of the limiting plate are connected with the upper ends of the supporting elements respectively.
4. The metal sheet coil electromagnetic forming apparatus as recited in claim 3, wherein The pressing assembly comprises an upper and lower aligned edge pressing block and a gasket; the edge part of the metal plate to be shaped is clamped between the edge pressing block and the gasket.
5. The metal sheet coil electromagnetic forming apparatus as recited in claim 4, wherein The pressing assembly is arranged on the upper part of the limiting plate, and the edge pressing block, the metal plate to be shaped, the gasket and the limiting plate are connected through bolts.
6. The metal sheet coil electromagnetic forming apparatus as recited in claim 1, wherein The base comprises a rectangular frame structure formed by a plurality of connecting rods; the base plate is fixed on the top of the rectangular frame structure.
7. The metal sheet coil electromagnetic forming apparatus as recited in claim 1, wherein The two ends of the metal plate to be shaped are respectively overlapped with conductive connectors, and the conductive connectors at the two ends are connected with a power supply through wires to form a loop.
8. The metal sheet coil electromagnetic forming apparatus as recited in claim 7, wherein The conductive connector is made of a copper sheet.