A magnetic flux concentrator and a forming device for electromagnetic pulse forming

Abstract

A magnetic flux concentrator and a forming device for electromagnetic pulse forming. Among them, the magnetic flux concentrator includes a magnetic flux concentrating core body with an annular structure. The magnetic flux concentrating core body has an axial through-hole and at least one set of radial hole groups. The radial hole groups include diversion slits that are circumferentially distributed along the magnetic flux concentrating core body and penetrate from the outer peripheral surface of the magnetic flux concentrating core body to the axial through-hole, workpiece forming holes that penetrate from the outer peripheral surface of the magnetic flux concentrating core body to the axial through-hole along the radial direction of the magnetic flux concentrating core body, and coil placement holes; the workpiece forming holes are connected to the coil placement holes through the diversion slits. During application, the discharge coil is coaxially inserted and restricted in the coil placement holes, which can not only effectively reduce the size and cost of the configured coil, but also avoid the bulging of the coil during operation, which is beneficial to improving the service life of the coil; at the same time, by selecting the number and arrangement mode of the workpiece forming holes, the magnetic flux concentrator can be used to press or weld and form multiple workpieces with the same or different specifications at one time, creating favorable conditions for improving the processing and production efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of electromagnetic forming, and particularly relates to a magnetic collector for electromagnetic pulse forming and a forming device. Background Art

[0002] Electromagnetic pulse forming technology is a high-speed, high-energy rate, short-time pulse processing technology, which is widely used in the crimping, welding, stamping, etc. of various workpieces; its basic principle is to discharge a capacitor bank to a discharge coil. A transient strong magnetic field is generated in the discharge coil due to the flowing of a rapidly changing current, so that eddy currents are formed on the surface of the workpiece placed therein, and the workpiece generates deformation under the action of electromagnetic force. In this technology, a magnetic collector is a key device that is often used.

[0003] A typical existing magnetic collector mainly includes a magnetic collecting core body with a cylindrical shape. Two axially opposite ends of the magnetic collecting core body are respectively recessed inward to form two symmetric frustum-shaped recesses. A through hole communicating the two recesses is provided along the axis of the magnetic collecting core body; at the same time, a slit distributed along the radial direction of the magnetic collecting core body is provided on the circumferential side wall of the magnetic collecting core body, so that the magnetic collecting core body forms an approximately C-shaped open-loop structure; in application, the magnetic collecting core body is placed inside a spiral tube-shaped discharge coil, and eddy currents are induced to form on the outer peripheral surface of the outer magnetic collecting core body. The eddy currents flow to the inner surface of the through hole through the slit. Since the axial length of the through hole is much smaller than the axial length of the magnetic collecting core body, the current density on the inner surface of the through hole will be greatly increased, and the magnetic field will also be correspondingly enhanced, so as to generate a radial pressure on the workpiece placed in the through hole and promote the workpiece to generate deformation.

[0004] Although this typical magnetic collector has a simple structure and is convenient to manufacture and use, due to the obstruction of the discharge coil, the magnetic collector as a whole is an inseparable structure, resulting in certain limitations in its actual application; at the same time, the discharge coil has a large volume and high cost; and the discharge coil will be bulged during operation, resulting in damage to the coil or shortening of its service life. Summary of the Invention

[0005] The main technical problem to be solved by the present invention is a magnetic collector for electromagnetic pulse forming and an electromagnetic pulse forming device applying the magnetic collector, so as to reduce the size of the coil and improve the service life of the coil.

[0006] According to a first aspect, in one embodiment, a magnetic collector for electromagnetic pulse forming is provided, including a magnetic collecting core body with an annular structure. The magnetic collecting core body has an axial through hole and at least one set of radial hole groups. The axial through hole is provided through along the axis of the magnetic collecting core body. The radial hole group includes:

[0007] The workpiece forming hole is used to accommodate the workpiece to be formed. The workpiece forming hole extends radially along the magnetic core assembly from the outer peripheral surface of the magnetic core assembly to the axial through hole, and the workpiece forming hole includes a first forming hole;

[0008] The coil placement hole is used to accommodate the discharge coil. The workpiece forming hole extends radially along the magnetic core assembly from the outer peripheral surface of the magnetic core assembly to the axial through hole, and the coil placement hole includes a first placement hole; and

[0009] The flow guiding gap extends circumferentially along the magnetic core assembly from the outer peripheral surface of the magnetic core assembly to the axial through hole, and the flow guiding gap includes a first flow guiding gap. The first flow guiding gap is used to connect the first placement hole and the first forming hole.

[0010] In one embodiment, the magnetic core assembly includes:

[0011] The first annular flap, on the axial end face of the first annular flap, there is a first recess, and the first recess extends through along the radial direction of the first annular flap; and

[0012] The second annular flap, on the axial end face of the second annular flap, there is a second recess, and the second recess extends through along the radial direction of the second annular flap;

[0013] The first annular flap and the second annular flap are coaxially and oppositely connected, such that the first recess and the second recess are in alignment to form the workpiece forming hole, the coil placement hole and the flow guiding gap.

[0014] In one embodiment, the workpiece forming hole includes two first forming holes. The two first forming holes are circumferentially spaced on both sides of the first placement hole along the magnetic core assembly. Each first forming hole is connected to the first placement hole through a first flow guiding gap.

[0015] In one embodiment, the workpiece forming hole further includes at least one second forming hole. The first placement hole, the first forming hole and the second forming hole are sequentially and circumferentially spaced along the magnetic core assembly; the flow guiding gap further includes a second flow guiding gap. The first forming hole is connected to an adjacent second forming hole through the second flow guiding gap.

[0016] In one embodiment, the workpiece forming hole includes one first forming hole. The workpiece forming hole further includes at least one second forming hole. The first placement hole, the first forming hole and the second forming hole are sequentially and circumferentially spaced along the magnetic core assembly; the flow guiding gap further includes a second flow guiding gap. The first forming hole is connected to an adjacent second forming hole through the second flow guiding gap.

[0017] In one embodiment, the workpiece forming hole includes a first forming hole, the coil placement holes include two first placement holes, the two first placement holes are circumferentially spaced on both sides of the first forming hole along the magnetic core body, and each placement hole communicates with the first forming hole through a first diversion slit.

[0018] In one embodiment, the trajectory shape presented by the diversion slit in the circumferential direction of the magnetic core body is any one of a straight line shape, a broken line shape, and a spline curve shape.

[0019] In one embodiment, the width of the diversion slit in the axial direction of the magnetic core body is 0.5 mm - 1.0 mm.

[0020] In one embodiment, the workpiece forming hole has:

[0021] An outer tapered hole section having an opposite tapered top end and a tapered bottom end, and the tapered bottom end of the outer tapered hole section penetrates the outer peripheral surface of the magnetic core body;

[0022] An inner tapered hole section having an opposite tapered top end and a tapered bottom end, and the tapered bottom end of the inner tapered hole section penetrates the axial through hole; and

[0023] A straight hole section located between the outer tapered hole section and the inner tapered hole section, and the outer tapered hole section is coaxially connected to the inner tapered hole through the straight hole section.

[0024] According to a second aspect, an electromagnetic pulse forming device is provided in an embodiment, including:

[0025] A magnetic collector for gathering a magnetic field and applying the gathered magnetic field to a workpiece to be formed, the magnetic collector adopts the magnetic collector for electromagnetic pulse forming described in the first aspect, and the portion to be formed of the workpiece to be formed is located in the workpiece forming hole;

[0026] A discharge coil for generating a magnetic field, the discharge coil is placed in the coil placement hole; and

[0027] A discharge control member for discharging the discharge coil to form a pulsed excitation current in the discharge coil, thereby generating a magnetic field; the discharge control member is electrically connected to the discharge coil.

[0028] The magnetic flux concentrator for electromagnetic pulse forming according to the above embodiments includes a magnetic flux concentrating core body with an annular structure. The magnetic flux concentrating core body has an axial through hole and at least one set of radial hole groups. The radial hole group includes diversion slits distributed along the circumferential direction of the magnetic flux concentrating core body and penetrating from the outer peripheral surface of the magnetic flux concentrating core body to the axial through hole, workpiece forming holes penetrating from the outer peripheral surface of the magnetic flux concentrating core body to the axial through hole along the radial direction of the magnetic flux concentrating core body, and coil placement holes; the workpiece forming holes are communicated with the coil placement holes through the diversion slits. When in application, the discharge coil is coaxially inserted and restricted in the coil placement hole, which can not only effectively reduce the size and cost of the configured coil, but also avoid the bulging of the coil during operation, which is beneficial to improving the service life of the coil; at the same time, by selecting the number and arrangement mode of the workpiece forming holes, the magnetic flux concentrator can be used to press or weld and form multiple workpieces with the same or different specifications at one time, creating favorable conditions for improving the processing and production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 FIG. is a schematic exploded view of the structure of the magnetic flux concentrator according to an embodiment of the present application when in application.

[0030] Figure 2 FIG. is a schematic diagram of the working principle of the magnetic flux concentrator according to an embodiment of the present application.

[0031] Figure 3 FIG. is a schematic reference diagram of the shape of the diversion slit of the magnetic flux concentrator according to an embodiment of the present application.

[0032] Figure 4 FIG. is a schematic assembly diagram of the structure of the magnetic flux concentrator according to an embodiment of the present application when adopting a split structure.

[0033] Figure 5 FIG. is a schematic exploded view of the structure of the magnetic flux concentrator according to an embodiment of the present application when adopting a split structure.

[0034] Figure 6 FIG. is a schematic layout diagram (I) of the structure of the radial hole group in the magnetic flux concentrator according to an embodiment of the present application.

[0035] Figure 7 FIG. is a schematic layout diagram (II) of the structure of the radial hole group in the magnetic flux concentrator according to an embodiment of the present application.

[0036] Figure 8 FIG. is a schematic layout diagram (III) of the structure of the radial hole group in the magnetic flux concentrator according to an embodiment of the present application.

[0037] Figure 9 FIG. is a schematic layout diagram (IV) of the structure of the radial hole group in the magnetic flux concentrator according to an embodiment of the present application.

[0038] Figure 10 FIG. is a schematic axial sectional view of the workpiece forming hole in the magnetic flux concentrator according to an embodiment of the present application.

[0039] Figure 11 This is a schematic diagram of the structural principle of a forming device according to an embodiment of the present application.

[0040] In the figure:

[0041] 100, magnetic core assembly; 101, first annular flap; 102, second annular flap; 103, first recess; 104, second recess; 110, axial through hole; 120, workpiece forming hole; 120a, outer tapered hole section; 120b, straight hole section; 120c, inner tapered hole section; 121, first forming hole; 122, second forming hole; 130, coil placement hole; 131, first placement hole; 140, flow guiding gap; 141, first flow guiding gap; 142, second flow guiding gap;

[0042] 200, capacitor; 300, switch; 400, power supply; A, wire harness cable; B, wire harness terminal; C, discharge coil. Detailed implementation manners

[0043] The present invention will be further described in detail below in conjunction with the accompanying drawings through specific implementation manners. Similar elements in different implementation manners are labeled with related similar element numbers. In the following implementation manners, many detailed descriptions are provided to enable a better understanding of the present application. However, those skilled in the art can easily recognize that some of the features can be omitted in different situations, or can be replaced by other elements, materials, or methods. In some cases, some operations related to the present application are not shown or described in the specification to avoid drowning the core part of the present application with excessive descriptions. For those skilled in the art, it is not necessary to describe these related operations in detail, and they can fully understand the related operations based on the descriptions in the specification and the general technical knowledge in the art.

[0044] In addition, the features, operations, or characteristics described in the specification can be combined in any appropriate manner to form various implementation manners. At the same time, the steps or actions in the method description can also be reordered or adjusted in an obvious manner by those skilled in the art. Therefore, the various sequences in the specification and drawings are only for clearly describing a certain embodiment and do not mean a necessary sequence unless it is stated that a certain sequence must be followed.

[0045] The numbers assigned to the components herein, such as "first", "second", etc., are only used to distinguish the described objects and do not have any sequential or technical meaning. And the "connection" and "coupling" mentioned in the present application, unless otherwise specified, both include direct and indirect connection (coupling).

[0046] Embodiment 1

[0047] Please refer toFigures 1 to 10 , a magnetic flux concentrator for electromagnetic pulse forming provided in the first embodiment can be used for crimping or welding of workpieces such as wire harnesses and tubes. To more clearly and detailedly illustrate the structure of the magnetic flux concentrator, the following takes its application in the field of new energy vehicles to realize the crimping forming of the wire harness terminal and the wire harness cable of the high-voltage wire harness as an example for description. However, it should be noted that the high-voltage wire harness is only one application object of the magnetic flux concentrator, and the magnetic flux concentrator can also be applied to other workpieces such as tubes and wire harnesses that require crimping forming or stamping welding; the magnetic flux concentrator includes a magnetic flux concentrating core body 100, and the magnetic flux concentrating core body 100 is an annular structure as a whole, which can be a typical circular ring structure, a polygonal ring or other special-shaped ring structures. The magnetic flux concentrating core body 100 can be made of copper alloy materials and chromium zirconium copper materials with properties such as high strength and high conductivity according to actual situations; at the same time, the magnetic flux concentrating core body 100 has (or is formed with after processing) an axial through hole 110 and a radial hole group; among them, the radial hole group is mainly composed of a workpiece forming hole 120, a coil placement hole 130 and a diversion gap 140; the following will be described separately.

[0048] Please refer to Figure 1 , Figures 3 to 10 , the axial through hole 110 is naturally formed based on the annular structure of the magnetic flux concentrating core body 100 itself, and it penetrates through the magnetic flux concentrating core body 100 along the axial direction of the magnetic flux concentrating core body 100. It can be understood that the axial through hole 110 is the axial inner ring hole of the magnetic flux concentrating core body 100.

[0049] Please refer to Figure 1 , Figures 3 to 9 , the diversion gap 140 is distributed along the circumferential direction of the magnetic flux concentrating core body 100 and penetrates from the outer peripheral surface of the magnetic flux concentrating core body 100 to the axial through hole 110, mainly playing the role of current diversion, so as to divert the induced current formed in the coil placement hole 130 to the workpiece forming hole 120, so that a strong magnetic field can be formed in the workpiece forming hole 120; the diversion gap 140 can be set to different shape structures according to actual situations. Specifically, the trajectory shape presented by the diversion gap 140 in the circumferential direction of the magnetic flux concentrating core body 100 can be linear (please refer to Figure 1 , Figures 4 to 9 ), broken line shape, spline curve shape (such as the wavy line shape shown in Figure 3 ), so as to divert the induced current in different structural forms to meet different application requirements. In some embodiments, the width of the diversion gap 140 in the axial direction of the magnetic flux concentrating core body 100 is set to 0.5 mm - 1.0 mm, which can maximize the current diversion effect and create conditions for improving the energy conversion rate of the magnetic flux concentrator.

[0050] Please refer to Figure 1 , Figures 3 to 10, the axis line of the workpiece forming hole 120 and the axis line of the coil placement hole 130 are in the same radial plane of the magnetic core body 100. The workpiece forming hole 120 and the coil placement hole 130 are circumferentially distributed along the magnetic core body 100 at a certain interval distance, and both are arranged in the radial direction of the magnetic core body 100 to penetrate from the outer peripheral surface of the magnetic core body 100 to the axial through hole 110. Among them, the workpiece forming hole 120 is mainly used to accommodate the workpiece to be formed. For example, the end of the wire harness cable A of the high-voltage wire harness is inserted into the workpiece forming hole 120 from the outer peripheral surface of the magnetic core body 100, and the wire harness terminal B of the high-voltage wire harness is inserted into the workpiece forming hole 120 from one side of the axial through hole 110. And the end sleeve of the wire harness terminal B is sleeved on the end of the wire harness cable A, so that the joint between the wire harness cable A and the wire harness terminal B is located in the workpiece forming hole 120. The coil placement hole 130 is mainly used to accommodate the discharge coil C, that is, the discharge coil C is placed in the coil placement hole 130 in a coaxial insertion sleeve manner. The discharge coil C can adopt a solenoid coil. By electrically connecting the discharge coil C to the discharge device and using the pulsed excitation current that can be formed in the discharge coil C, according to the principle of electromagnetic induction, a corresponding induced current can be formed on the inner peripheral surface of the coil placement hole 130. The induced current is diverted to the inner peripheral surface of the workpiece forming hole 120 through the diversion gap 140, so as to form a strong magnetic field in the workpiece forming hole 120. And eddy currents can be generated on the surface of the wire harness terminal B under the action of the strong magnetic field, thereby generating another pulsed magnetic field. The two magnetic fields with opposite directions will generate an electromagnetic repulsive force to cause the wire harness terminal B to deform rapidly in the radial direction towards the wire harness cable A, and then the wire harness terminal B is crimped on the wire harness cable A due to uniform radial tightening.

[0051] In one embodiment, the workpiece forming hole 120 includes a first forming hole 121, the coil placement hole 130 includes a first placement hole 131, and the diversion gap 140 includes a first diversion gap 141. Among them, along the circumference of the magnetic core body 100, the first diversion gap 141 is located between the first forming hole 121 and the first placement hole 131, so as to connect the first forming hole 121 and the first placement hole 131 by using the first diversion gap 141, so that the induced current generated in the first placement hole 131 can flow into the first forming hole 121 along the first diversion gap 141, and then the wire harness terminal B and the wire harness cable A placed in the first forming hole 121 are crimped together.

[0052] First, the coil placement hole 130 provides a structural assembly space for the discharge coil C, enabling the discharge coil C to be directly inserted and confined within the coil placement hole 130 instead of being wound around the outer peripheral surface of the magnetic core assembly 100 in the traditional way. This not only significantly reduces the size of the discharge coil C and the application and manufacturing costs of the coil and the magnetic collector, but also, when the magnetic collector is operating, the discharge coil C will be subject to a radial force within the coil placement hole 130 and is not prone to bulging, creating conditions for improving the service life of the discharge coil C.

[0053] Second, the coil placement hole 130 can aggregate the induced current (or magnetic field) generated by the discharge coil C, and the induced current is diverted to the workpiece forming hole 120 through the diversion gap 140 provided between the workpiece forming hole 120 and the coil placement hole 130, so that the aggregated magnetic field can ultimately be evenly applied to the wire harness terminal C. This can not only achieve the full utilization of the electromagnetic field, but also ensure the crimping quality of the wire harness terminal C. Specifically, taking a high-voltage wire harness as an example, the electromagnetic force with high pulse energy acts on the end sleeve of the wire harness terminal C, causing the end sleeve part of the wire harness terminal C to radially contract due to the strong and inward radial pressure, thereby squeezing the wire harness cable A to form a tight arrangement, effectively avoiding problems such as the increase in contact resistance, the reduction of mechanical tensile and torsional resistance of the high-voltage wire harness caused by the looseness of a small number of core wires or the occurrence of indentations (even breakages) due to the compression of the wire harness terminal C.

[0054] Third, multiple groups of radial hole groups can be provided on the magnetic core assembly 100. By placing the discharge coil C in the coil placement hole 130 of each group of radial hole groups and through the selection of the sizes of the respective coil placement holes 130 or the respective discharge coils C, or the regulation of the magnitude of the induced current of the discharge coil C, the overall magnetic collector can perform crimping or welding forming processes on multiple workpieces to be formed with the same or different size specifications at one time, creating favorable conditions for improving production efficiency.

[0055] The magnetic core assembly 100 can adopt an integral structure that cannot be disassembled or a split split-type combined structure according to the actual situation. In one embodiment, please refer to Figure 4 and Figure 5, the integrated magnetic core 100 is coaxially spliced by a first annular lobe 101 and a second annular lobe 102; specifically, taking an axial end face of the first annular lobe 10 as the first splicing end face, and taking an axial end face of the second annular lobe 102 as the second splicing end face that cooperates with the first splicing end face, a first recess 103 recessed along the axial direction of the integrated magnetic core 100 is provided on the first splicing end face. Correspondingly, a second recess 104 recessed along the axial direction of the integrated magnetic core 100 is provided on the second splicing end face. The first recess 103 and the second recess 104 are symmetrically distributed with the annular surface where the first splicing end face coincides with the second splicing end face as the boundary. By selecting and setting the recess depth or shape of the local areas of the first recess 103 and the second recess 104, after the first annular lobe 101 and the second annular lobe 102 are coaxially and oppositely spliced, using the structural alignment relationship between the first recess 103 and the second recess 104, a workpiece forming hole 120, a coil placement hole 130, and a diversion gap 140 can be constructed between the two annular lobes (or in the integrated magnetic core 100) (it can also be understood that at this time, the extended part of the annular surface formed by the coincidence of the first splicing end face and the second splicing end face passes through the axis lines of the workpiece forming hole 120 and the coil placement hole 130). Thus, by disassembling the first annular lobe 101 and the second annular lobe 102, the wire harness terminal B and / or the wire harness cable A can be quickly taken and placed before and after the crimping process of the wire harness terminal B and the wire harness cable A, so as to avoid problems such as inconvenient workpiece picking and placing and poor combination of the terminal and the cable; for example, before crimping, the wire harness cable A and the wire harness terminal B can be accurately placed in the recessed area corresponding to the workpiece forming hole 120 to intuitively control the depth (or length) of the end sleeve of the wire harness terminal B sleeved on the wire harness cable A, and ensure that the dimensions of the combined part of the two meet the corresponding process conditions.

[0056] In other embodiments, the integrated magnetic core 100 can also be assembled by a plurality of open semi-ring structures; taking the integrated magnetic core 100 having a set of radial hole groups and this set of radial hole groups having a workpiece forming hole 120 as an example, axially separating the integrated magnetic core 100 along the axis line of the workpiece forming hole 120 can make the integrated magnetic core 100 equivalent to being assembled by two approximately C-shaped lobes. By disassembling the integrated magnetic core 100, it is convenient to quickly and accurately arrange the wire harness cable A and the wire harness terminal B in the recessed area corresponding to the workpiece forming hole 120 (or take out the completed crimped high-voltage wire harness). After the two lobes are combined, they can enclose the workpiece forming hole 120, and the area where the wire harness cable A and the wire harness terminal B are combined is located within the workpiece forming hole 120.

[0057] In one embodiment, please refer to Figure 6, the workpiece forming holes 120 include two first forming holes 121. The two first forming holes 121 are circumferentially spaced on both sides of the first placement hole 131 along the circumferential direction of the magnetic core body 100. Each first forming hole 121 communicates with the first placement hole 131 through a first diversion gap 141, so that one first placement hole 131 can correspond to two first forming holes 121 at the same time. The induced current generated by the discharge coil C in the first placement hole 131 can flow into the corresponding first forming holes 121 on both sides through the first diversion gaps 141 respectively. In specific applications, one discharge coil C can be used to complete the crimping or welding operations of two workpieces at the same time; by differentially selecting the sizes of the two first forming holes 121, it can be applicable to two workpieces of different specifications or different types.

[0058] In one embodiment, on the basis of the foregoing embodiment, the number of workpiece forming holes 120 can be expanded to perform crimping or welding operations on a larger number of workpieces at one time. Specifically, please refer to Figure 6 , the workpiece forming holes 120 further include at least one second forming hole 122. At this time, the first forming hole 121 can be understood as a workpiece forming hole 120 adjacent to the first placement hole 131, and the second forming hole 122 can be understood as a workpiece forming hole 120 separated from or far away from the first placement hole 131; wherein, the first placement hole 131, the first forming hole 121, and the second forming hole 122 are arranged sequentially and spaced along the circumferential direction of the magnetic core body 100, and the second forming hole 122 and the first forming hole 121 and between two adjacent second forming holes 122 are communicated through a diversion gap 140 (the diversion gap 140 here can be defined as a second diversion gap 142 to distinguish it from the first diversion gap 141 between the first placement hole 131 and the first forming hole 121), so as to arrange one or more workpiece forming holes 120 on both circumferential sides of the first placement hole 131 at the same time, so that one first placement hole 131 or one discharge coil C can simultaneously perform crimping or welding treatment on workpieces placed in different workpiece forming holes 120.

[0059] In one embodiment, one or more workpiece forming holes 120 can also be sequentially arranged on one side of the circumferential direction of the first placement hole 131. Please refer to Figure 7, one workpiece forming hole 120 adjacent to the first placement hole 131 is defined as the first forming hole 121 (i.e., the workpiece forming hole 120 includes one first forming hole 121), and the other workpiece forming holes 120 far from the first placement hole 131 are defined as the second forming holes 122 (i.e., the workpiece forming hole 120 further includes at least one second forming hole 122), so as to form a structural feature in which the first placement hole 131, the first forming hole 121, and the second forming holes 122 are sequentially and spaced apart in the circumferential direction of the magnetic core body 100; correspondingly, the first placement hole 131 and the first forming hole 121 are connected through a diversion gap 140 (denoted as the first diversion gap 141), and there is also a connection through the diversion gap 140 between the first forming hole 121 and the second forming holes 122 and between two adjacent second forming holes 122 (denoted as the second diversion gap 142), so that it is also possible to perform crimping or welding treatment on workpieces placed in different workpiece forming holes 120 by one discharge coil C at the same time.

[0060] In one embodiment, a workpiece can be crimped or welded by multiple discharge coils C to meet the crimping or welding requirements of wire harnesses or pipe fittings with particularly large diameters; please refer to Figure 8 , each radial hole group only contains one workpiece forming hole 120 (denoted as the first forming hole 121), and one coil placement hole 130 is arranged on each side of the circumference of the first forming hole 121 (it can be understood that the coil placement hole 130 includes two first placement holes 131), and each first placement hole 131 is connected to the first forming hole 121 through a diversion gap 140 (i.e., the first diversion gap 141); in specific applications, the magnetic fields generated by the discharge coils C in the two first placement holes 131 can be jointly concentrated in the same first forming hole 121 through the corresponding diversion gaps 140 to crimp or weld the workpiece in the first forming hole 121. Due to the improvement of the electromagnetic force, the magnetic collector in this embodiment can be applied to wire harnesses or pipe fittings with particularly large diameters.

[0061] In one embodiment, please refer to Figure 10, the workpiece forming hole 120 adopts a variable-diameter hole structure, that is: the workpiece forming hole 120 has an outer tapered hole section 120a, a straight hole section 120b and an inner tapered hole section 120c distributed in sequence; among them, both the outer tapered hole section 120a and the inner tapered hole section 120c have opposite cone tips and cone bottoms. The cone bottom of the outer tapered hole section 120a penetrates the outer peripheral surface of the magnetic core body 100 and can be used for the wire harness cable A to be inserted from the outer peripheral side of the magnetic core body 100. The cone bottom of the inner tapered hole section 120c penetrates the axial through hole 110 and can be used for the wire harness terminal B to be inserted from the inner ring opening side of the magnetic core body 100. The straight hole section 120b is located between the cone tip of the outer tapered hole section 120a and the cone tip of the inner tapered hole section 120c and coaxially connects the two into one body, and can be used for placing the combined part of the wire harness cable A and the wire harness terminal B. Thus, from the perspective of the axial cross-sectional shape of the workpiece forming hole 120, its aperture changes in a stepped manner. The aperture of the straight hole section 120b is the smallest, and the surface of the straight hole section 120b is the closest to the surface of the wire harness terminal B. According to Ohm's law and the skin effect, the induced current flowing into the workpiece forming hole 120 through the diversion gap 140 will flow along the path with the shortest surface distance, making the current density of the straight hole section 120 the largest. Therefore, the straight hole section 120b is used as the area for accommodating the combined part of the wire harness terminal B and the wire harness cable A, which can maximize the magnetic collection effect and realize the tight connection between the wire harness terminal B and the wire harness cable A.

[0062] In one embodiment, please refer to Figure 9 , multiple groups of radial hole groups can be arranged on the magnetic core body 100, and each radial hole group can be composed of different numbers or different arrangements of workpiece forming holes 120, coil placement holes 130 and diversion gaps 140 according to actual situations to meet different application requirements.

[0063] Embodiment 2

[0064] Please refer to Figure 11 and combine with Figures 1 to 10, Embodiment 2 provides an electromagnetic pulse forming device, including a discharge control component, a discharge coil C, and a magnetic collector; wherein, the output end of the discharge control component is electrically connected to the discharge coil C, mainly used for instantaneously discharging the discharge coil C; the magnetic collector adopts the magnetic collector for electromagnetic pulse forming described in the foregoing Embodiment 1, and the workpiece to be formed is placed in the workpiece forming hole 120 of the magnetic collector. The magnetic field is concentrated by the magnetic collector and the concentrated magnetic field is applied to the workpiece, so as to drive the workpiece to undergo radial shrinkage deformation under the action of electromagnetic force, thereby realizing the crimping and welding treatment of the workpiece; the discharge coil C is placed in the coil placement hole 130 of the magnetic collector. After the discharge control component discharges it, a changing pulsed excitation current can be formed in the discharge coil C, and finally an eddy current is generated on the outer peripheral surface of the workpiece under the cooperation of the coil placement hole 130, the diversion gap 140, and the workpiece forming hole 120, and a strong magnetic field is triggered, so that the workpiece is uniformly stressed under the action of electromagnetic force. Due to the series of effects generated by the structural configuration of the magnetic collector, the forming device can perform tight crimping and welding treatment on wire harness workpieces and pipe workpieces, ensure the treatment quality, and at the same time can perform crimping or welding treatment on multiple workpieces of the same or different specifications and sizes at one time, effectively improving the work efficiency.

[0065] In one embodiment, please refer to Figure 11 , the discharge control component is mainly built by combining a capacitor module 200, a power supply module 400, and a control module 300; wherein, the capacitor module 200 is electrically connected to the power supply module 400 and the control module 300 respectively, the discharge coil C is electrically connected to the capacitor module 200, the power supply module 400 can adopt an AC power supply, and the control module 300 is composed of a switch, a charge and discharge management circuit, and other devices that exist as required; by using the control module 300 to conduct the power supply module 400 and the capacitor module 200, the power supply module 400 can be controlled to charge the capacitor module 200 to saturation; when the control module 300 conducts the capacitor module 200 and the discharge coil C, the capacitor module 200 can be made to instantaneously discharge the discharge coil C.

[0066] The above uses specific examples to elaborate on the present invention, which is only used to help understand the present invention and is not intended to limit the present invention. For those skilled in the technical field to which the present invention pertains, based on the idea of the present invention, several simple deductions, deformations, or substitutions can also be made.

Claims

1. A magnetic flux concentrator for electromagnetic pulse forming, characterized in that, A magnetic core assembly including a ring structure, the magnetic core assembly having an axial through-hole and multiple groups of radial hole groups, the axial through-hole being axially penetratingly provided along the magnetic core assembly, and the multiple groups of radial hole groups being circumferentially distributed along the magnetic core assembly; Among them, the radial hole group includes: A workpiece forming hole for accommodating a workpiece to be formed, the workpiece forming hole penetrating from the outer peripheral surface of the magnetic core assembly to the axial through-hole along the radial direction of the magnetic core assembly, and the workpiece forming hole includes a first forming hole; A coil placement hole for accommodating a discharge coil, the coil placement hole penetrating from the outer peripheral surface of the magnetic core assembly to the axial through-hole along the radial direction of the magnetic core assembly, and the coil placement hole includes a first placement hole; and A diversion gap, penetrating from the outer peripheral surface of the magnetic core assembly to the axial through-hole along the circumferential direction of the magnetic core assembly, and the diversion gap includes a first diversion gap, the first diversion gap being used to connect the first placement hole and the first forming hole; Among them, the magnetic core assembly includes a first annular lobe and a second annular lobe, a first recessed portion is provided on the axial end surface of the first annular lobe, the first recessed portion is axially penetratingly provided along the radial direction of the first annular lobe, a second recessed portion is provided on the axial end surface of the second annular lobe, the second recessed portion is axially penetratingly provided along the radial direction of the second annular lobe; the first annular lobe and the second annular lobe are coaxially and oppositely connected, so that the first recessed portion and the second recessed portion are in alignment to form the workpiece forming hole, the coil placement hole and the diversion gap.

2. The magnetic flux concentrator for electromagnetic pulse forming according to claim 1, characterized in that, The workpiece forming hole includes two first forming holes, the two first forming holes are circumferentially spaced on both sides of the first placement hole along the magnetic core assembly, and each first forming hole is connected to the first placement hole through a first diversion gap.

3. The magnetic flux concentrator for electromagnetic pulse forming according to claim 1, wherein The workpiece forming hole further includes at least one second forming hole, and the first placement hole, the first forming hole and the second forming hole are sequentially and spaced apart along the circumferential direction of the magnetic core assembly; The diversion gap further includes a second diversion gap, and the first forming hole is connected to an adjacent second forming hole through the second diversion gap.

4. The magnetic flux concentrator for electromagnetic pulse forming according to claim 1, characterized in that, The workpiece forming hole includes one first forming hole, the workpiece forming hole further includes at least one second forming hole, and the first placement hole, the first forming hole and the second forming hole are sequentially and spaced apart along the circumferential direction of the magnetic core assembly; The diversion gap further includes a second diversion gap, and the first forming hole is connected to an adjacent second forming hole through the second diversion gap.

5. The magnetic flux concentrator for electromagnetic pulse forming according to claim 1, wherein The workpiece forming hole includes one first forming hole, the coil placement hole includes two first placement holes, the two first placement holes are circumferentially spaced on both sides of the first forming hole along the magnetic core assembly, and each placement hole is connected to the first forming hole through a first diversion gap.

6. The magnetic flux concentrator for electromagnetic pulse forming according to claim 1, characterized in that, The trajectory shape presented by the diversion gap in the circumferential direction of the magnetic core assembly is any one of a straight line shape, a broken line shape, and a spline curve shape.

7. The magnetic flux concentrator for electromagnetic pulse forming according to claim 6, characterized in that, The width of the diversion gap in the axial direction of the magnetic core assembly is 0.5 mm - 1.0 mm.

8. The magnetic flux concentrator for electromagnetic pulse forming according to claim 1, wherein The workpiece forming hole has: An outer tapered hole section having an opposite taper top end and taper bottom end, and the taper bottom end of the outer tapered hole section penetrates the outer peripheral surface of the magnetic core assembly; An inner tapered hole section having opposite tapered top and bottom ends, the tapered bottom end of the inner tapered hole section penetrating an axial through hole; and A straight hole section located between the outer tapered hole section and the inner tapered hole section, the outer tapered hole section being coaxially connected to the inner tapered hole through the straight hole section.

9. An electromagnetic pulse forming device, characterized in that, Comprising: A magnetic collector for gathering a magnetic field and applying the gathered magnetic field to a workpiece to be formed, the magnetic collector being the magnetic collector for electromagnetic pulse forming according to any one of claims 1-8, and the portion to be formed of the workpiece to be formed being located within a workpiece forming hole; A discharge coil for generating a magnetic field, the discharge coil being placed in a coil placement hole; And A discharge control member for discharging the discharge coil to form a pulsed excitation current in the discharge coil, thereby generating a magnetic field; the discharge control member being electrically connected to the discharge coil.

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