An external openable magnetic collector

Abstract

The application discloses an external openable magnetic collector, which is divided into a first half magnetic collector and a second half magnetic collector, and the upper and lower halves are respectively provided with two semicircular holes; the first semicircular hole is used for placing a magnetic field coil; two second semicircular holes form a working area and are used for placing workpieces; the surface between the first half magnetic collector and the second half magnetic collector is insulated by using a polyimide film, and electrical connection is formed by using special screws; the tapered surface of one end of the special screw is tightly attached to the tapered hole surface of the first half magnetic collector, and the other end is tightly attached to the tapered hole surface of the second half magnetic collector through a tapered nut, so that the problem of sparking caused by the uneven contact surface of the first half magnetic collector and the second half magnetic collector is solved, and the service life of the external magnetic collector is improved.

Description

Technical Field

[0001] This invention belongs to the field of electromagnetic forming technology, specifically relating to an externally openable and closable magnet. Background Technology

[0002] Electromagnetic pulse forming is a technique that uses electromagnetic repulsion to process metal workpieces. During the forming process, a pulse capacitor bank discharges to a magnetic field coil, generating a large pulse current in the coil. Due to electromagnetic induction, an induced current is generated inside the workpiece, which is then subjected to electromagnetic force in the magnetic field. This causes the workpiece to deform rapidly under the influence of electromagnetic repulsion, thus increasing the material's forming limit. To improve the forming effect, an electromagnetic forming device typically includes a magnet collector. The workpiece is located within the magnet collector's working area. Because the magnet collector has a longitudinal slit, the induced current is concentrated on the surface of the working area, enhancing the magnetic field strength within the magnet collector's working area.

[0003] Because the current magnet collector is located inside the coil, the electromagnetic forming device cannot be detachable, thus limiting the application of electromagnetic forming technology in situations with complex structures and irregular workpiece shapes. Therefore, a closable coil device based on an external magnet collector is required. However, due to processing and installation issues, the surfaces of the two magnet collector halves are always uneven, and the induced current inside the magnet collector is in the hundreds of kA to MA range. Therefore, it is difficult to avoid severe ablation caused by arcing on the surfaces of the two magnet collector halves, which greatly reduces the service life of the external closable magnet collector. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to address the shortcomings of the prior art by providing an externally openable magnetic collector, which solves the problem of severe ablation caused by arcing on the surface of the two halves of the magnetic collector, and greatly improves the service life of the externally openable magnetic collector.

[0005] The present invention adopts the following technical solution:

[0006] An externally closable magnetic collector includes a first half-magnetic collector and a second half-magnetic collector. The two ends of the first half-magnetic collector and the second half-magnetic collector are fixedly connected by a special-shaped screw and a conical nut, respectively. A circular area for placing a magnetic field coil and a workpiece is provided between the first half-magnetic collector and the second half-magnetic collector, respectively. The diameter of the circular area where the magnetic field coil is located is larger than the diameter of the circular area where the workpiece is located.

[0007] Specifically, the first and second half magnets are respectively provided with first semicircular holes, and the magnetic field coil is set in the circular area formed by the two first semicircular holes.

[0008] Furthermore, the gap between the magnetic field coil and the first half-collector magnet and the second half-collector magnet is 0.5 to 1 mm.

[0009] Specifically, the first and second half of the magnet are respectively provided with second semicircular holes, and the workpiece is placed in the circular area formed by the two second semicircular holes.

[0010] Specifically, a gap is provided between the lower surface of the first half of the magnet and the upper surface of the second half of the magnet.

[0011] Furthermore, the gap between the lower surface and the upper surface is 0.5 to 1 mm.

[0012] Furthermore, insulating layers are provided on the contact sides of the lower and upper surfaces respectively.

[0013] Specifically, the irregular screw includes a screw rod, one end of which is provided with a tapered end, and the other end is connected to a tapered nut.

[0014] Furthermore, the first half of the magnet has a first conical hole corresponding to the conical end, and the second half of the magnet has a second conical hole corresponding to the conical nut. The surface of the conical end is in close contact with the surface of the first conical hole, and the surface of the conical nut is in close contact with the surface of the second conical hole.

[0015] Furthermore, the gap between the screw and the surfaces of the first and second tapered holes is 1 to 2 mm.

[0016] Compared with the prior art, the present invention has at least the following beneficial effects:

[0017] This invention discloses an externally operable magnet collector, comprising a first half-magnetic collector and a second half-magnetic collector. The induced current generated by the magnetic field coil passes sequentially through the first and second semi-circular holes of the first half-magnetic collector, the lower surface of the first half-magnetic collector, and then through the conical end of the irregularly shaped screw, the screw rod, and the conical nut to the second half-magnetic collector, thereby achieving the purpose of changing the current distribution. Furthermore, since the diameter of the circular region where the workpiece is located is smaller than the diameter of the circular region where the magnetic field coil is located, the magnetic field is concentrated and enhanced in the circular region where the workpiece is located. The external magnet collector can be divided into two parts, enabling the magnet collector to be opened. The openable structure does not affect the effect of the magnet collector. When processing long and complex-shaped workpieces, it is convenient to handle the workpiece, thus expanding the application range of electromagnetic forming technology.

[0018] Furthermore, the first semicircular hole surrounds the magnetic field coil inside, which facilitates electromagnetic coupling between the magnetizer and the magnetic field coil.

[0019] Furthermore, since the gap between the lower surface of the first half magnet and the upper surface of the second half magnet is only 0.5 to 1 mm, and the induced current on the two surfaces is in opposite directions, the inductance value of the induced current loop is reduced, thereby increasing the efficiency of the external openable magnet.

[0020] Furthermore, the second semicircular hole is the working area of ​​the magnet collector, and the workpiece is electromagnetically formed inside the second semicircular hole.

[0021] Furthermore, a gap is provided between the lower surface of the first half-magnet and the upper surface of the second half-magnet to guide the direction of the current and allow the current to flow through the working area.

[0022] Furthermore, the gap between the lower and upper surfaces is 0.5–1 mm to ensure that the gap is not broken down during the discharge process, while the gap distance is also as small as possible to minimize the impact on the electromagnetic forming of the workpiece in the working area.

[0023] Furthermore, insulating layers are provided on the contact sides of the lower and upper surfaces to ensure insulation in the gap and prevent breakdown during discharge.

[0024] Furthermore, the irregular screw consists of a tapered end and a screw rod, which solves the arcing problem caused by uneven contact surfaces between the first and second half of the magnet collector, and improves the service life of the external magnet collector.

[0025] Furthermore, the conical surface is in close contact with the conical hole surface of the first half of the magnet collector, and the other end is in close contact with the conical hole surface of the second half of the magnet collector through a conical nut. This not only solves the problem of severe erosion and spot welding caused by poor contact of the openable and closable contact parts of the external magnet collector, but also the conical shape has a self-centering function, which limits the misalignment of the first semicircular hole and the second semicircular hole caused when the two parts of the magnet collector are installed.

[0026] Furthermore, the gap between the screw and the surfaces of the first and second conical holes is 1 to 2 mm, which fixes and guides the first and second half-magnets.

[0027] In summary, this invention solves the arcing problem caused by uneven contact surfaces of external magnet collectors, and improves the service life of external magnet collectors.

[0028] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the externally openable magnetic collector of the present invention;

[0030] Figure 2 This is a schematic diagram showing the direction of current in an openable collector magnet.

[0031] Wherein: 1. First half-collector magnet; 2. Second half-collector magnet; 3. First semi-circular hole; 4. Second semi-circular hole; 5. Magnetic field coil; 6. Special-shaped screw; 7. Conical nut; 101. First conical hole; 102. Lower surface; 201. Second conical hole; 202. Upper surface; 601. Conical end; 602. Screw. Detailed Implementation

[0032] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0033] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "one side," "one end," and "one side," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0034] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0035] It should be understood that, when used in this specification and the appended claims, the terms "comprising" and "including" indicate the presence of the described features, integrals, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or collections thereof.

[0036] It should also be understood that the terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the invention. As used in this specification and the appended claims, the singular forms “a,” “an,” and “the” are intended to include the plural forms unless the context clearly indicates otherwise.

[0037] It should also be further understood that the term "and / or" as used in this specification and the appended claims refers to any combination of one or more of the associated listed items and all possible combinations, and includes such combinations.

[0038] The accompanying drawings illustrate various structural schematic diagrams according to embodiments disclosed in this invention. These drawings are not to scale, and some details have been enlarged for clarity, and some details may have been omitted. The shapes of the various regions and layers shown in the drawings, as well as their relative sizes and positional relationships, are merely exemplary and may deviate from reality due to manufacturing tolerances or technical limitations. Furthermore, those skilled in the art can design regions / layers with different shapes, sizes, and relative positions as needed.

[0039] This invention provides an external, openable magnet collector, which consists of a first half and a second half. Each half has two semicircular holes. The first semicircular hole is used to place a magnetic field coil, and the two second semicircular holes form a working area for placing a workpiece. The surfaces of the first and second half magnet collectors are insulated with a polyimide film and electrically connected by a shaped screw. One end of the shaped screw has a tapered surface that fits tightly against the tapered hole surface of the first half magnet collector, while the other end, via a tapered nut, fits tightly against the tapered hole surface of the second half magnet collector. This solves the arcing problem caused by uneven contact surfaces between the first and second half magnet collectors and improves the service life of the external magnet collector.

[0040] Please see Figure 1 The present invention discloses an externally operable magnetic collector, comprising a first half-magnetic collector 1, a second half-magnetic collector 2, a first semi-circular hole 3, and a second semi-circular hole 4. The first semi-circular hole 3 and the second semi-circular hole 4 are respectively disposed on the contact side of the first half-magnetic collector 1 and the second half-magnetic collector 2. The two first semi-circular holes 3 form a circular area for placing a magnetic field coil 5, and the two second semi-circular holes 4 form a circular area for placing a workpiece. The two ends of the first half-magnetic collector 1 and the second half-magnetic collector 2 are fixedly connected by a special-shaped screw 6 and a conical nut 7, respectively. A gap is provided between the first half-magnetic collector 1 and the second half-magnetic collector 2. The magnetic field coil 5 is placed in the first semi-circular hole 3, and there is a gap of 0.5 to 1 mm between it and the magnetic collector. The workpiece is placed in the second semi-circular hole 4.

[0041] The contact side between the first half-magnet 1 and the second half-magnet 2 is the lower surface 102 of the first half-magnet, and the contact side between the second half-magnet 2 and the first half-magnet 1 is the upper surface 202 of the second half-magnet. The lower surface 102 of the first half-magnet and the upper surface 202 of the second half-magnet are respectively insulated with polyimide film, and there is a gap of 0.5 to 1 mm between them.

[0042] The first half-collector 1 and the second half-collector 2 are fixed and guided by a special-shaped screw 6. The special-shaped screw 6 consists of a tapered end 601 and a screw 602. The gap between the screw 602 and the surfaces of the first tapered hole 101 and the second tapered hole 201 is 1 to 2 mm.

[0043] The tapered end 601 of the irregular screw 6 is in close contact with the surface of the first tapered hole 101, and the other end is in close contact with the surface of the second tapered hole 201 through the tapered nut 7. This solves the arcing problem caused by the uneven contact surface between the first half magnet collector 1 and the second half magnet collector 2, and improves the service life of the external magnet collector.

[0044] Please see Figure 2 This diagram illustrates the current direction of the openable magnet collector. When a pulse current i1 is generated in the magnetic field coil, an induced current i2 is generated in the first half-magnet collector 1 and the second half-magnet collector 2. The induced currents in the two magnet collectors form a circulating current through the irregular screw 6 and the irregular nut 7. Since the gap between the two magnet collectors is only 0.5 to 1 mm, and the current directions at the gap are opposite, the inductance of the induced current loop is reduced, thus improving the efficiency of the electromagnetic forming device.

[0045] The specific implementation steps of the external openable magnetic collector connection method of the present invention are as follows:

[0046] The magnetic field coil 5 is placed in the first semicircular hole 3 of the openable magnetic collector, without any electrical connection between the magnetic field coil 5 and the openable magnetic collector. The magnetic field coil 5 is connected to an external pulse capacitor bank, and the external circuit is controlled by a gas switch or a semiconductor switch.

[0047] The workpiece is placed in the second semicircular hole 4. After the workpiece is placed, the tapered screw 6 is placed in the tapered holes 101 and 201 of the first and second semicircular magnets 1 and 2, respectively, and the tapered nut 7 is tightened, thereby completing the fixing of the openable magnets and the electrical connection of the first and second semicircular magnets 1 and 2. Then, a trigger signal is applied to turn on the switch, and a current i1 flows through the circuit. Under the action of the large current, the coil 5 induces a current i2 in the first and second semicircular magnets 1 and 2. The induced current i2 generates a strong magnetic field in the second semicircular hole 4, causing the metal pipe to deform under the action of electromagnetic force, and the processing is completed.

[0048] After processing is completed, loosen the conical nut 7 to separate the first half magnet 1 from the second half magnet 2, thus making it easy to remove the workpiece.

[0049] In summary, this invention provides an externally detachable magnet collector with a detachable structure, enabling the application of electromagnetic forming technology in situations with complex structures and irregular workpiece shapes. It solves the problem of severe burning caused by uneven contact surfaces in two-part magnet collectors due to processing and installation issues, significantly improving the service life of the externally detachable magnet collector.

[0050] The above content is only for illustrating the technical concept of the present invention and should not be construed as limiting the scope of protection of the present invention. Any modifications made to the technical solution based on the technical concept proposed in this invention shall fall within the scope of protection of the claims of this invention.

Claims

1. An externally operable magnetic collector, characterized in that, It includes a first half magnet (1) and a second half magnet (2). A gap is provided between the lower surface (102) of the first half magnet (1) and the upper surface (202) of the second half magnet (2). The two ends of the first half magnet (1) and the second half magnet (2) are fixedly connected by a special screw (6) and a conical nut (7), respectively. A circular area for placing a magnetic field coil (5) and a workpiece is provided between the first half magnet (1) and the second half magnet (2), respectively. The diameter of the circular area where the magnetic field coil (5) is located is larger than the diameter of the circular area where the workpiece is located.

2. The externally operable magnetic collector according to claim 1, characterized in that, The first half-collector magnet (1) and the second half-collector magnet (2) are respectively provided with a first semi-circular hole (3), and the magnetic field coil (5) is set in the circular area formed by the two first semi-circular holes (3).

3. The externally operable magnetic collector according to claim 2, characterized in that, The gap between the magnetic field coil (5) and the first half magnet (1) and the second half magnet (2) is 0.5~1mm.

4. The externally operable magnetic collector according to claim 1, characterized in that, The first half-collector magnet (1) and the second half-collector magnet (2) are respectively provided with second semi-circular holes (4), and the workpiece is placed in the circular area formed by the two second semi-circular holes (4).

5. The externally operable magnetic collector according to claim 1, characterized in that, The gap between the lower surface (102) and the upper surface (202) is 0.5~1mm.

6. The externally operable magnetic collector according to claim 1, characterized in that, Insulating layers are provided on the contact sides of the lower surface (102) and the upper surface (202).

7. The externally operable magnetic collector according to claim 1, characterized in that, The irregular screw (6) includes a screw (602), one end of which is provided with a tapered end (601), and the other end is connected to a tapered nut (7).

8. The externally operable magnetic collector according to claim 7, characterized in that, The first half-collector (1) has a first conical hole (101) corresponding to the conical end (601), and the second half-collector (2) has a second conical hole (201) corresponding to the conical nut (7). The surface of the conical end (601) is in close contact with the surface of the first conical hole (101), and the surface of the conical nut (7) is in close contact with the surface of the second conical hole (201).

9. The externally operable magnetic collector according to claim 8, characterized in that, The gap between the screw (602) and the surfaces of the first tapered hole (101) and the second tapered hole (201) is 1~2mm.

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