Electromagnetic pulse magnetic collection structure based on current path optimization

Abstract

The utility model belongs to the technical field of electromagnetic pulse welding, and particularly relates to an electromagnetic pulse magnetic collection structure based on current path optimization, which comprises a magnetic collector and a coil arranged on the side surface of the magnetic collector in a surrounding manner, the magnetic collector comprises two magnetic collection parts, the two magnetic collection parts are symmetrically arranged along the axis of the coil, and a gap is formed between the two magnetic collection parts. Grooves are formed in the opposite faces of the two magnetism collecting pieces, the grooves penetrate through the two ends of the magnetism collecting pieces in the axial direction of the coil, a welding working cavity allowing a plate to be welded to penetrate through is formed between the grooves of the two magnetism collecting pieces, the areas, located on the bottom faces of the grooves, of the two magnetism collecting pieces form a welding working face, and the welding working face is a plane. On the basis that welding energy is not increased, the induction current intensity and the energy utilization rate are improved, double-layer welding is achieved, the collision speed and the welding quality are improved, stable and effective welding combination between plate bodies is promoted, and the welding seam quality and the connection strength of thick plate welding are improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of electromagnetic pulse welding, and particularly relates to an electromagnetic pulse magnetism collecting structure based on current path optimization. BACKGROUND

[0002] As a welding technology based on high-speed impact to realize solid-phase metallurgical bonding, electromagnetic pulse welding exhibits significant advantages in dissimilar material connection, and is particularly suitable for connection of dissimilar metals such as aluminum and copper. However, as the energy density of power batteries is continuously improved, the battery connecting components need to have sufficient thickness to bear large current. Since the single-turn coil has few turns and poor energy utilization, although the multi-turn coil can improve energy efficiency, the magnetic field is dispersed, so the existing technology uses a magnetism collector to concentrate the current in the multi-turn coil in a smaller area, so as to form a stronger magnetic field in the local area to achieve the effect of higher density induced eddy current and Lorentz force inside the workpiece.

[0003] As the energy density of power batteries is continuously improved, in order to ensure that the battery connecting components can bear large current, they need to have sufficient thickness and connection strength. However, for the welding between plates, generally, flat coils combined with flat plate magnetism collectors are used for single-sided welding, and the welding between thick plates is prone to problems such as poor weld quality and low connection strength. INVENTION CONTENTS

[0004] The technical problem to be solved by the utility model is to provide an electromagnetic pulse magnetism collecting structure based on current path optimization, which can improve the induced current intensity and energy utilization without increasing the welding energy, realize double-layer welding, improve the collision speed and welding quality, promote stable and effective welding combination between plate bodies, and improve the weld quality and connection strength of thick plate welding.

[0005] The content of the utility model comprises a magnetism collector and a coil arranged around the side surface of the magnetism collector. The magnetism collector comprises two magnetism collecting pieces, the two magnetism collecting pieces are symmetrically arranged along the axis of the coil, and there is a gap between the two magnetism collecting pieces. The two magnetism collecting pieces are provided with grooves on opposite sides, the grooves penetrate through both ends of the magnetism collecting piece along the axial direction of the coil, the grooves of the two magnetism collecting pieces form a welding working cavity for the plate body to be welded to pass through, and the area of the two magnetism collecting pieces on the groove bottom surface forms a welding working surface. The welding working surface is a plane.

[0006] Further, the two sides of the groove bottom surface and the side of the magnetism collecting piece with the groove are transitioned through an arc surface, so that the two sides inside the groove are arc-shaped.

[0007] Further, the two sides inside the groove are circular arc-shaped, and the cross section of the welding working cavity along the radial direction of the coil is a long circle.

[0008] Further, the groove is centrally arranged on the opposite faces of the two magnetic collecting members and axially penetrates the two ends of the magnetic collecting members.

[0009] Further, the two ends of the two magnetic collecting members are provided with chamfered surfaces at the penetration of the groove, and the welding surface is located between the chamfered surfaces of the two ends of the magnetic collecting members.

[0010] Further, the two ends of the two magnetic collecting members are provided with cavities along the axial direction of the coil, the cavities penetrate the face of the magnetic collecting member along the radial direction of the coil and face the other magnetic collecting member, the region between the two cavities of the single magnetic collecting member forms a middle platform, and the groove is arranged on the middle platform.

[0011] Further, the chamfered surfaces are arranged at the two ends of the middle platform.

[0012] Further, the region of the magnetic collecting member provided with the cavity forms an axial extension arranged along the axial direction of the coil, and the radial dimension of the axial extension is the same in different axial regions.

[0013] Further, the face of the two magnetic collecting members facing the inside of the coil is arc-shaped.

[0014] Further, the coil is a multi-turn coil.

[0015] The beneficial effects of the utility model are that the magnetic collector adopts two magnetic collecting members in a split type, and is provided with a groove and other structures, the induced current generated due to the symmetrical arrangement and the gap of the two magnetic collecting members flows from the gap to the inner surface of the magnetic collecting member along the outer surface of the single magnetic collecting member, and a closed loop is formed, thereby optimizing the current path and the distribution of the magnetic field on the coupling structure design of the coil surrounding the magnetic collector, the induced current can be effectively gathered to the to-be-welded region close to the two to-be-welded plate bodies, the intensity of the induced current and the energy utilization rate can be improved on the basis of not increasing the welding energy, the magnetic field is concentrated and uniformly acts on the to-be-welded region of the two to-be-welded plate bodies, the to-be-welded region of the two to-be-welded plate bodies can collide in opposite directions under the action of the magnetic field, thereby realizing double-layer welding, improving the collision speed and the welding quality, promoting the stable and effective welding combination between the plate bodies, improving the welding quality and the process reliability, and effectively improving the welding quality and the connection strength when applied to thick plate welding. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is a first view schematic diagram of the electromagnetic pulse magnetic collecting structure based on current path optimization of the utility model.

[0017] Figure 2 It is a second view schematic diagram of the electromagnetic pulse magnetic collecting structure based on current path optimization of the utility model.

[0018] Figure 3This utility model Figure 2 AA section view in the image.

[0019] Figure 4 This is a schematic diagram of the current path during welding according to this utility model.

[0020] Figure 5 This is a schematic diagram of the double-sided welding process for the plate to be welded.

[0021] In the diagram: 1. Magnet collector; 11. Magnet collecting component; 111. Groove; 112. Central platform; 113. Axial extension section; 114. Chamfered bevel; 12. Gap; 2. Coil; 3. Plate to be welded; 4. Pad. Detailed Implementation

[0022] like Figures 1-5 As shown, this utility model provides an electromagnetic pulse magnetizing structure based on current path optimization, including a magnetizer 1 and a coil 2 surrounding the side of the magnetizer 1. The magnetizer 1 and the coil 2 are coaxially arranged. The magnetizer 1 includes two magnetizing components 11, which are symmetrically arranged along the axis of the coil 2 and have a gap 12 between them, meaning that the two magnetizing components 11 do not contact each other. In practical applications, the two magnetizing components 11 can be fixed by external supports or other structures to maintain their stability and relative position. Each of the two magnetizing components 11 has a groove 111 on its opposite side. The groove 111 extends along the axial direction of the coil 2 through both ends of the magnetizing component 11. The area between the grooves 111 of the two magnetizing components 11 forms a welding working cavity through which the plates 3 to be welded pass. During welding, the two plates 3 to be welded are located within this welding working cavity. The two magnetic collecting elements 11 form a welding working surface on the bottom surface of the groove 111. The welding working surface is planar and is parallel to the welding area of ​​the plate 3 to be welded during welding. The radial dimension of the bottom surface of the groove 111 is larger than the width of the plate 3 to be welded to ensure that the magnetic field uniformly covers the welding area.

[0023] In use, the welding areas of the two plates 3 to be welded are inserted into the welding working chamber, and a pad 4 is provided between the two plates 3 to be welded, so that there is a gap 1 between the welding areas of the two plates 3 to be welded. The gap 1 is controlled between 0.1 and 10 mm according to the actual situation. The two plates 3 to be welded are kept in relative position by an external support mechanism or fixing mechanism, and there is a gap 2 between the two plates 3 to be welded and the corresponding welding working surface. The gap 1 is controlled between 0.1 and 5 mm according to the actual situation.

[0024] The magnetic collecting structure of this utility model uses two separate magnetic collecting components 11 for the magnetic collector 1, and is equipped with structures such as grooves 111. When applied to electromagnetic pulse welding, such as... Figure 4As shown, the current in the coil 2 flows in the direction of the arrow shown as I1, and due to the symmetrical arrangement of the two magnetic concentrating pieces 11 and the gap 12, the induced current flows from the gap 12 along the outer surface of the single magnetic concentrating piece 11 to the inner surface of the single magnetic concentrating piece 11 (i.e. the side of the single magnetic concentrating piece 11 facing the other magnetic concentrating piece 11), forming a closed loop, I S1 I1 is the induced current loop formed by one of the magnetic concentrating pieces 11 S2 I2 is the induced current loop formed by the other magnetic concentrating piece 11. Thus, in the coupling structure design of the coil 2 around the magnetic concentrator 1, the current path and the magnetic field distribution are optimized, the induced current can be effectively concentrated near the welding area of the two plate bodies 3 to be welded, the intensity of the induced current and the energy utilization rate can be improved without increasing the welding energy, and the magnetic field can be concentrated and uniformly applied to the welding area of the two plate bodies 3 to be welded (i.e. as shown in Figure 5 The welding area of the two plate bodies 3 to be welded can collide under the action of the magnetic field, thereby realizing double-layer welding, improving the collision speed and welding quality, promoting stable and effective welding between the plate bodies, improving the welding quality and process reliability, and effectively improving the welding quality and connection strength when applied to thick plate welding.

[0025] As shown in Figure 2 The two sides of the bottom surface of the groove 111 and the side of the magnetic concentrating piece 11 with the groove 111 are transitioned by an arc surface, so that the two sides inside the groove 111 are arc-shaped. Based on this arrangement, the current path can be further optimized, the current concentration and magnetic field distortion at sharp corners can be reduced, the energy loss can be reduced, and the uniformity and stability of the magnetic field distribution in the welding working cavity can be further improved. Preferably, the two sides inside the groove 111 are circularly arc-shaped, and the cross section of the welding working cavity in the radial direction of the coil 2 is oblong.

[0026] The groove 111 is centrally arranged on the opposite side of the two magnetic concentrating pieces 11 and axially penetrates both ends of the magnetic concentrating piece 11. By centrally arranging the groove 111, the welding working surface is centrally arranged to further ensure symmetrical distribution of the magnetic field, avoid partial load, and improve the consistency and reliability of the welding process.

[0027] The edges of the two ends of the two magnetic concentrating pieces 11 at the penetration of the groove 111 are each provided with a chamfered slope 114, and the working surface is located between the chamfered slopes 114 at the two ends of the magnetic concentrating piece 11. Based on the arrangement of the chamfered slope 114, the magnetic field leakage at the edges can be reduced, which is beneficial to concentrating and enhancing the magnetic field.

[0028] The two ends of the two magnetic members 11 are provided with recessed cavities in the axial direction of the coil 2, the recessed cavities penetrate through the side of the magnetic member 11 facing the other magnetic member 11 in the radial direction of the coil 2, the region between the two recessed cavities of a single magnetic member 11 forms a middle platform 112, and the recessed groove 111 is arranged on the middle platform 112, specifically on the opposite sides of the middle platform 112 of the two magnetic members 11 and penetrates through the two ends of the middle platform 112 in the axial direction. Based on this arrangement, the current path concentration effect can be optimized, and the magnetic field can act more accurately on the welding area. The chamfered bevel 114 is arranged at the two ends of the middle platform 112 in combination with the structure of the middle platform 112, which can better concentrate the induced current and magnetic field in the welding working cavity, thereby further improving the intensity of the induced current and the energy utilization rate.

[0029] As shown in Figure 3 The region where the magnetic member 11 is provided with the recessed cavity forms an axial extension 113 arranged in the axial direction of the coil 2, based on this arrangement, the two magnetic members 11 have sufficient axial dimensions to adapt to the axial dimensions of the coil 2, and preferably the radial dimensions of the axial extension 113 in different axial regions are the same.

[0030] The side of the two magnetic members 11 facing the inside of the coil 2 is arc-shaped, that is, the outer side of the two magnetic members 11 is arc-shaped, which can better adapt to the curvature of the inside of the coil 2, enhance the magnetic field conduction efficiency, and reduce the magnetic flux leakage.

[0031] The coil 2 is a multi-turn coil, which can improve the ampere-turns and energy utilization rate, achieve effective welding at a lower current and energy, reduce the burden on the pulse discharge device, and prolong the service life of the coil 2 and the device.

[0032] It should be understood by those skilled in the art that the above discussion of any embodiment is only exemplary and is not intended to limit the scope of protection of the present application to these examples; under the idea of the present application, the above embodiments or technical features in different embodiments can also be combined, the steps can be implemented in any order, and there are many other changes of different aspects of one or more embodiments of the present application as described above. In order to be brief, they are not provided in detail.

[0033] One or more embodiments of the present application are intended to cover all such alternatives, modifications and variations falling within the broad scope of the present application. Therefore, any omissions, modifications, equivalent replacements, improvements, etc. made in the spirit and principles of one or more embodiments of the present application should be included in the scope of protection of the present application.

Claims

1. An electromagnetic pulse magnetizing structure based on current path optimization, characterized in that, The device includes a magnet collector (1) and a coil (2) surrounding the side of the magnet collector (1). The magnet collector (1) includes two magnet collectors (11). The two magnet collectors (11) are symmetrically arranged along the axis of the coil (2) and there is a gap (12) between the two magnet collectors (11). The opposite side of the two magnet collectors (11) is provided with a groove (111). The groove (111) passes through both ends of the magnet collector (11) along the axis of the coil (2). A welding working cavity is formed between the grooves (111) of the two magnet collectors (11) for the plate body (3) to be welded to pass through. The area of ​​the bottom surface of the groove (111) of the two magnet collectors (11) forms a welding working surface. The welding working surface is a plane.

2. The electromagnetic pulse magnetizing structure based on current path optimization as described in claim 1, characterized in that, The two sides of the bottom surface of the groove (111) and the side of the magnetic collecting component (11) with the groove (111) are connected by an arc surface, so that the two sides inside the groove (111) are arc-shaped.

3. The electromagnetic pulse magnetizing structure based on current path optimization as described in claim 2, characterized in that, The two sides inside the groove (111) are arc-shaped, and the cross section of the welding working cavity along the radial direction of the coil (2) is oblong.

4. The electromagnetic pulse magnetizing structure based on current path optimization as described in any one of claims 1-3, characterized in that, The groove (111) is centrally located on one side of the two magnetic collecting components (11) facing each other and axially extends through both ends of the magnetic collecting components (11).

5. The electromagnetic pulse magnetizing structure based on current path optimization as described in any one of claims 1-3, characterized in that, Both ends of the two magnetic collecting components (11) are provided with chamfered bevels (114) at the edges where the grooves (111) pass through, and the welding working surface is located between the chamfered bevels (114) at both ends of the magnetic collecting components (11).

6. The electromagnetic pulse magnetizing structure based on current path optimization as described in claim 5, characterized in that, Both ends of the two magnetic collecting elements (11) are provided with cavities along the axial direction of the coil (2). The cavities are provided along the radial direction of the coil (2) and are located on the side of the magnetic collecting element (11) facing the other magnetic collecting element (11). The area between the two cavities of a single magnetic collecting element (11) forms a central platform (112). The groove (111) is provided on the central platform (112).

7. The electromagnetic pulse magnetizing structure based on current path optimization as described in claim 6, characterized in that, The chamfered bevel (114) is located at both ends of the central platform (112).

8. The electromagnetic pulse magnetizing structure based on current path optimization as described in claim 6, characterized in that, The region of the magnetic collecting element (11) with a cavity forms an axial extension section (113) arranged along the axial direction of the coil (2), and the radial dimensions of the axial extension section (113) are the same in different regions along the axial direction.

9. The electromagnetic pulse magnetizing structure based on current path optimization as described in any one of claims 1-3 and 6-8, characterized in that, The two magnetic collecting components (11) have an arc-shaped side facing the inside of the coil (2).

10. The electromagnetic pulse magnetizing structure based on current path optimization as described in any one of claims 1-3 and 6-8, characterized in that, The coil (2) is a multi-turn coil.

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