Joint welding splice hollow magnet collector

Abstract

A hollow magnet collector for joint welding includes a magnet collector body and a coil wound around the outer periphery of the magnet collector body. The magnet collector body includes several magnet collecting modules, which are assembled into a ring structure. The magnet collector body has a central hole that runs vertically through the center line. A fan-shaped slit that runs radially through the side wall of the magnet collector body and gradually increases in size outward from the central hole is provided along the central hole. Each magnet collecting module has a fan-shaped annular slot that runs vertically through the center, with concentric inner and outer arcs and concentric with the central hole. A welding part and a workpiece to be welded are fixed in the central hole. The front end of the welding part is hollow, and the workpiece to be welded is inserted into the welding part. This invention achieves precise control of the electromagnetic field, effectively saves 48% or more of the material usage, improves the material utilization rate, reduces energy loss, improves the welding quality and efficiency of the joint, has good self-heating ability, simple structure, good rigidity, easy assembly, and low manufacturing difficulty.

Description

Technical Field

[0001] The present invention relates to the technical field of magnetic field concentrators, and particularly relates to a spliced hollow magnetic field concentrator for joint welding. Background Art

[0002] Electromagnetic forming technology has unique advantages in the manufacture of metal workpieces. It is not only a non-contact processing method, but also a processing method that can improve the forming limit of metal materials, and its processing time is much shorter than that of the conventional stamping method. As an important auxiliary device in the electromagnetic forming process, the magnetic field concentrator has many benefits during the forming process. Compared with the conventional electromagnetic forming scheme, it has a more flexible magnetic field adjustment mode, and also optimizes the heat generation phenomenon in the system, which is a key part to promote the development of electromagnetic forming and improve the forming effect. Due to the existence of the skin effect, only a part of the classic magnetic field concentrator is utilized as a whole, which results in low material utilization and heavy weight of the entire forming system; in addition, stray current is very likely to be generated, resulting in energy loss; the solid structure of the classic magnetic field concentrator also leads to heat accumulation, the excess heat is difficult to be dissipated through simple natural convection, and it is not conducive to the arrangement of heat dissipation auxiliary parts in the later stage; for all these reasons, the structure of the classic magnetic field concentrator is urgently to be optimized.

[0003] At present, there are many patents related to the structural optimization of magnetic field concentrators, for example, CN114871327A discloses a magnetic field concentrator for electromagnetic bulging, which cuts the classic magnetic field concentrator to a large extent to obtain a magnetic field concentrator structure similar to the shape of the Chinese character "工" (I-shape), achieving the purpose of weight reduction; however, in this solution, the cutting difficulty of the magnetic field concentrator is significantly increased, the strength of the magnetic field concentrator cannot be guaranteed, and it is not easy to assemble. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a spliced hollow magnetic field concentrator for joint welding, which can reduce the weight of the system, improve the utilization rate of materials and system energy, and increase the heat dissipation area while ensuring the forming effect of the electromagnetic forming system equipped with the magnetic field concentrator.

[0005] To solve the above technical problem, the technical solution adopted by the present invention is: a spliced hollow magnetic field concentrator for joint welding, comprising a magnetic field concentrator body and a coil wound around the outer periphery of the magnetic field concentrator body, the magnetic field concentrator body includes a plurality of magnetic concentration modules, and the plurality of magnetic concentration modules are assembled to form the magnetic field concentrator body with an annular structure, the magnetic field concentrator body is provided with a central hole penetrating vertically along the axis line, a slit penetrating radially through the side wall of the magnetic field concentrator body is arranged along the central hole, each magnetic concentration module is provided with a vertically penetrating slot, a workpiece to be welded and a workpiece to be joined are fixed in the central hole, the front end of the workpiece to be welded has a hollow section, and the workpiece to be joined is inserted into the workpiece to be welded.

[0006] In a preferred solution, the area of the inner surface of the magnetic field concentrator body is 30% or less of the area of the outer surface of the magnetic field concentrator body.

[0007] In a preferred embodiment, the thickness of both the inner and outer walls of the magnetizing module is not less than 1 / 4 of the overall thickness.

[0008] In a preferred embodiment, the magnet collector body is made of copper alloy material, and the coil is a copper coil.

[0009] In a preferred embodiment, the sidewalls of several magnet collecting modules of the magnet collector body are aligned, with a slit between each pair.

[0010] In a preferred embodiment, the slit is fan-shaped and gradually increases in size outward along the radial direction of the central hole.

[0011] In a preferred embodiment, the width of the slit at its widest point, i.e. the width around the outer perimeter of the magnet collector body, does not exceed 1.3% of the outer perimeter of the magnet collector body.

[0012] In a preferred embodiment, the slot is a fan-shaped ring, with the inner and outer arcs of the fan-shaped ring being concentric, and also concentric with the magnet body and its central hole.

[0013] In a preferred embodiment, the walls around the slot are coated with a heat-resistant insulating layer, and an auxiliary heat dissipation device is installed inside the slot.

[0014] In a preferred embodiment, when the workpiece to be welded is a pipe, an insulating rubber column is inserted inside the workpiece.

[0015] The present invention provides a splicing hollow magnet collector for joint welding, which has the following beneficial effects: 1. The present invention has a reasonable structural design, exquisite dimensions, and a scientific and standardized method, which realizes precise control of electromagnetic fields; 2. The invention features multiple hollow designs, which effectively saves 48% or more of the material used, improves material utilization, and reduces energy loss; 3. The multi-lobed assembly design of the inner and outer rings in this invention effectively improves the welding quality of the joint and has good self-heating ability. 4. The design of the inner and outer ring dimensions of this invention further ensures that the electromagnetic force is concentrated on the inner wall of the magnet collector body, realizing precise control of the electromagnetic force and further improving the welding efficiency and quality of the joint. 5. The slit and slit structure of this invention further reduce energy loss and improve energy utilization, thereby further improving welding efficiency; 6. The slotted design of this invention provides an interface for the subsequent installation of an external heat dissipation device; 7. The heat-resistant material inside the slot of this invention provides protection for the subsequently installed external heat dissipation device; 8. The present invention uses a magnet collector body made of copper alloy material and a copper coil, which further optimizes the conductivity of the magnet collector body, making its magnet collection effect better and further improving the energy utilization rate. 9. The insulating rubber column of the present invention effectively prevents the deformation of the welded parts caused by stress concentration during welding, and also effectively ensures the concentration of energy, further improving the quality and efficiency of the welded joint. 10. This invention has a simple structure, is easy to assemble, has low manufacturing difficulty, good rigidity, large potential for future upgrades, strong applicability, wide range of applications, and high promotional value. Attached Figure Description

[0016] The present invention will be further described below with reference to the accompanying drawings and embodiments: Figure 1 This is a schematic diagram of the structure of the magnet body of the present invention; Figure 2 This is a schematic diagram of the current flow direction in the magnet collector body of the present invention; Figure 3 This is an overall sectional view of Embodiment 1 of the present invention; Figure 4 This is a top view of Embodiment 2 of the present invention; Figure 5 This is a top view of Embodiment 3 of the present invention; Figure 6 This is a top view of Embodiment 4 of the present invention; Figure 7 This is an overall sectional view of Embodiment 5 of the present invention; In the diagram: 1. Magnetizing module; 2. Center hole; 3. Slit; 4. Groove; 5. Coil; 6. Welded part; 7. Insulating adhesive column; 8. Water box; 9. Fan; 10. Heat sink; 11. Stranded wire; 12. Detailed Implementation

[0017] The technical solutions of the present invention will be further described below with reference to the accompanying drawings and embodiments.

[0018] Example 1 Please see the appendix Figures 1-3 As shown, a hollow magnet collector for joint welding includes a magnet collector body and a coil 5 wound around the outer periphery of the magnet collector body. The magnet collector body includes several magnet collecting modules 1, which are assembled into a ring structure. The magnet collector body has a central hole 2 that runs vertically through the center line. A slit 3 that runs radially through the side wall of the magnet collector body is provided along the central hole 2. Each magnet collecting module 1 has a slot 4 that runs vertically through the center. A welding part 6 and a welding part 7 are fixed in the central hole 2. The front end of the welding part 6 is hollow, and the welding part 7 is inserted into the welding part 6.

[0019] In this embodiment, the area of ​​the inner surface of the magnet collector body is 25% of the area of ​​the outer surface of the magnet collector body; the thickness of both the inner and outer walls of the magnet collecting module 1 is not less than 1 / 4 of the overall thickness; the magnet collector body is made of copper alloy material, and the coil 5 is a copper coil; the side walls of several magnet collecting modules 1 of the magnet collector body are aligned, with a slit 3 between each pair; the slit 3 is fan-shaped, gradually increasing in size outward along the radial direction of the central hole 2; the width of the slit 3 at its widest point, i.e., the width around the outer perimeter of the magnet collector body, does not exceed 1.3% of the outer perimeter of the magnet collector body; the slot 4 is a fan-shaped ring, with the inner and outer arcs of the fan-shaped ring concentric, and concentric with the magnet collector body and its central hole 2; the walls of the slot 4 are coated with a heat-resistant insulating layer, and an auxiliary heat dissipation device is provided inside the slot 4; when the welded part 7 is a pipe, a section of insulating rubber column 8 is inserted inside the welded part 7.

[0020] Appendix Figure 2 The middle arrow indicates the direction of electromagnetic force. During the welding process, the magnet collector body of the present invention is placed in the welding area outside the workpiece 6 and the workpiece 7 to be welded. A pulse current is passed into the coil 5. The workpiece 7 does not undergo significant deformation under the support of the insulating glue column 8. The workpiece 6 is driven by the Lorentz force to violently collide with the workpiece 7 to achieve welding.

[0021] Current exhibits the skin effect. By analyzing the location where the current concentrates within the magnet collector body, the flow path of the pulse current within the magnet collector body can be determined as follows: 1) The pulse capacitor discharges, generating a pulse current flowing through coil 5. The pulse current brings a strong magnetic field that passes through the outer surface of the magnet collector body. According to Lenz's law, induced eddy currents are generated on the outer surface. Due to the skin effect, the eddy currents converge on the outer surface of the magnet collector body. 2) The eddy current at the outer surface of the magnet body flows to the inner surface through the side of the slit 3; 3) The induced eddy currents on the inner wall of the magnet body will cause eddy currents to be generated in the weldment 6, and under the action of the magnetic field, Lorentz force will be generated, which will then cause deformation and violent impact on the welded part 7. In this invention, since the area of ​​the inner surface is 25% of the area of ​​the outer surface, the current density gathered on the inner surface of the magnet collector is greater, which plays a role in regulating the magnetic field. The current on the magnet collector body flows from the ring upwards through the outer wall of the magnet collecting module 1, through the slit 3, converges on the inner wall, and then flows back through the slit 3, forming a closed loop.

[0022] In this invention, the current analysis and calculation are performed according to the following formula: In the formula, δ is the skin depth of the current, μ is the relative permeability of the material used in the magnet collector body, σ is the relative conductivity of the material used in the magnet collector body, and f is the frequency of the current flowing through coil 5, which is determined by the capacitance and inductance in the circuit. The circuit topology of electromagnetic forming can be simply equivalent to a second-order circuit, in which the discharge capacitor and the equivalent inductance of the circuit are generally small, so the frequency is large, resulting in a shallow skin depth, which is concentrated on the surface of the material. This means that a large part of the magnet collector body will only have a small amount of stray current. This part of the current has little effect on the welding process and brings a certain amount of energy loss. Therefore, this part belongs to the "useless area", which causes material waste and excessive weight of the magnet collector body.

[0023] Based on the above analysis and calculation, this embodiment improves the structure of the magnet collector body by removing useless parts and using casting and other processes during processing to further reduce material loss. The current density on the inner surface is further increased, and the welding efficiency is significantly improved. The slot 4 in the magnet collecting module 1 plays a role in weight reduction and, more importantly, reduces stray current in the center of the magnet collector body, thereby reducing energy loss.

[0024] Example 2 In another preferred embodiment, based on the above embodiment 1, refer to Appendix Figure 4 The coil 5 and other components are omitted in the figure. Each slot 4 is equipped with a cooling water box 9 made of non-conductive material. The water box 9 is close to the inner wall of the slot 4. Through the external water circulation system, the magnet collecting module 1 is cooled when the magnet collecting body is working, so that the whole system maintains the optimal working temperature during repeated discharge. The area of ​​the inner surface of the magnet collecting module 1 is 25% of the area of ​​the outer surface.

[0025] In this embodiment, a cooling water box is provided in the slot 4 of each magnet collecting module 1. During the welding process, the water in the water box 9 is continuously circulated through an external water circulation system to cool down the magnet collecting module 1, so that the magnet collecting module 1 can maintain a temperature state that allows it to work sustainably and prevent the magnet collecting body and other components from being damaged due to excessive temperature.

[0026] Example 3 In another preferred embodiment, based on the above embodiment 1, refer to Appendix Figure 5 The magnet collecting module 1 has a slot 4 with built-in fans 10. Each fan 10 blows upwards, allowing the cold air from below to enter through the slot 4 inside the magnet collecting module 1, which accelerates the cooling of the magnet collecting module 1. When the magnet collector body is working, it cools down the magnet collecting module 1, so that the entire system maintains the optimal operating temperature during repeated discharge.

[0027] In this embodiment, a fan is built into the slot 4 of the magnet collecting module 1. By adding cold air from the bottom through the slot 4 of the magnet collecting module 1, the cooling of the magnet collecting module 1 is accelerated. Since the magnet collector body is small in size, only one fan 10 is needed in each magnet collecting module 1, which also simplifies the installation of the welding system.

[0028] Example 4 In another preferred embodiment, based on the above embodiment 1, refer to Appendix Figure 6 An aluminum heat sink 11 is placed in the slot 4 of the magnet collecting module 1. The aluminum heat sink 11 is in close contact with the magnet collecting module 1 on all sides, which increases the heat dissipation area of ​​the magnet collecting module 1 and further enhances the rigidity of the structure. When the magnet collecting body is working, it cools down the magnet collecting module 1, so that the entire system maintains the optimal operating temperature during repeated discharge.

[0029] In this embodiment, an aluminum heat sink 11 is placed in the slot 4 of the magnetizing module 1. When air passes through the slot 4 in the magnetizing module 1, it carries away the heat from the heat sink, thereby accelerating the cooling of the magnetizing module. This solution is not only easy to install but also requires no additional equipment, effectively improving the operability and applicability of the system.

[0030] Example 5 In another preferred embodiment, based on the above embodiment 1, refer to Appendix Figure 7 The steel-cored aluminum stranded wire 12 on the cable joint is placed inside the welding part 6 with a certain gap between it and the welding part 6. At this time, a pulse current is passed into the coil 5. The induced eddy current on the inner wall of the magnet body will cause eddy current to be generated in the welding part 6, and under the action of the magnetic field, Lorentz force is generated, which in turn causes deformation and violent impact on the built-in steel-cored aluminum stranded wire 12, thereby completing the crimping of the cable joint.

[0031] In this embodiment, the stranded wire 12 is not limited to steel-cored aluminum stranded wire 12; other types of stranded wire 12 can also be welded in this embodiment. During the welding process, the total diameter of the stranded wire 12 must be smaller than the inner diameter of the weldment 6, and there must be a gap between them. The cable joint is crimped by the electromagnetic force generated by the surrounding magnetic collecting module 1. During the crimping process, the crimping system can be cooled in conjunction with the above embodiments 2-4.

[0032] In a preferred embodiment, the area of ​​the inner surface of the magnet collector body is 30% or less of the area of ​​the outer surface of the magnet collector body. This setting further ensures that the electromagnetic force is concentrated on the inner wall of the magnet collector body, realizing precise control of the electromagnetic force and further improving the welding efficiency and quality of the joint.

[0033] In a preferred embodiment, the thickness of both the inner and outer walls of the magnet collecting module 1 is not less than 1 / 4 of the overall thickness. This setting further reduces the weight of the magnet collector body, improves the utilization rate of materials, and further reduces stray current and energy loss.

[0034] In a preferred embodiment, the magnet collector body is made of copper alloy material, and the coil 5 is a copper coil. Using copper alloy material for the magnet collector body and copper coil further optimizes the conductivity of the magnet collector body, making its magnetizing effect better and further improving the energy utilization rate.

[0035] In the preferred embodiment, the sidewalls of several magnetizing modules 1 of the magnetizer body are aligned, with a slit 3 between each pair; this arrangement further reduces the dispersed current and stray magnetic force, making the energy more concentrated and precisely controlled, and further improving the energy utilization rate.

[0036] In the preferred embodiment, the width of the slit 3 at its widest point, i.e. the width around the outer perimeter of the magnet collector body, does not exceed 1.3% of the outer perimeter of the magnet collector body. This setting concentrates the energy on each magnet collecting module into a whole, increasing the energy intensity and thus improving the welding efficiency of the joint.

[0037] The slit 3 is fan-shaped and gradually increases in size outward along the radial direction of the central hole 2. This design breaks the "skin" effect of magnetism, allowing magnetic energy to be further concentrated on the inner wall, reducing the loss of discrete energy and improving energy utilization.

[0038] In the preferred embodiment, the slot 4 is a fan-shaped ring, with the inner and outer arcs of the fan-shaped ring being concentric and also concentric with the magnet collector body and its central hole 2. The slot 4 further reduces the weight of the device and improves the utilization rate of materials. The concentricity of the inner and outer arcs with the magnet collector body and its central hole further ensures the welding quality of the joint and provides good heat dissipation performance.

[0039] In a preferred embodiment, an auxiliary heat dissipation device is provided in the slot 4; the auxiliary heat dissipation device further enhances the heat dissipation capacity of the magnet body, thereby further improving the welding quality and efficiency of the joint.

[0040] In a preferred embodiment, the four sides of the slot 4 are coated with a heat-resistant insulating layer; the heat-resistant insulating layer provides protection for the added auxiliary heat dissipation device, further ensuring the heat dissipation effect of the auxiliary heat dissipation device.

[0041] In a preferred embodiment, the magnet collector body includes several magnet collecting modules 1, and the magnet collecting modules 1 are assembled into a ring-shaped magnet collector body. The above configuration further reduces the weight of the device, lowers its manufacturing difficulty, and at the same time ensures the rigidity of the device, facilitates assembly, and enhances operability.

[0042] In a preferred embodiment, when the workpiece 7 to be welded is a pipe, an insulating rubber column 8 is inserted inside the workpiece 7. This arrangement prevents the workpiece 6 and the workpiece 7 from rapidly approaching and colliding under strong magnetic field, thus preventing deformation. The insulating rubber column 8 provides internal support, thereby further ensuring the quality of the welded joint. At the same time, the insulation of the rubber column further concentrates energy, improving energy utilization and thus further improving welding efficiency.

[0043] In summary, this invention achieves precise control of the electromagnetic field, effectively saves 48% or more of material usage, improves material utilization, reduces energy loss, enhances the welding quality and efficiency of joints, has good self-heating capabilities, a simple structure, is easy to assemble, has low manufacturing difficulty, has great potential for future upgrades, is highly applicable, has a wide range of applications, and has high promotional value.

[0044] Finally, it should be noted that the specific dimensions of this experimental device should not be limited to the scale shown in the attached drawings. In particular, the area of ​​the inner surface of the magnetic collecting module 1 is 25% of the area of ​​the outer surface. The above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A hollow magnet collector for joint welding, comprising a magnet collector body and a coil (5) wound around the outer periphery of the magnet collector body, characterized in that: The magnet collector body includes several magnet collecting modules (1), and the magnet collecting modules (1) are assembled into a ring structure. The area of ​​the inner surface of the magnet collecting body is 30% or less of the area of ​​the outer surface of the magnet collecting body. The magnet collecting body has a central hole (2) that runs vertically through the center line, and a slit (3) that runs radially through the side wall of the magnet collecting body is provided along the central hole (2). Slits (3) are left between each pair of magnet collecting modules (1). The slits (3) are fan-shaped and gradually increase in size outward along the radial direction of the central hole (2). The width of the slit (3) at its widest point is the width of the outer periphery of the magnet collecting body. The circumference of the magnet collector body shall not exceed 1.3% of the outer perimeter of the magnet collector body; each magnet collector module (1) shall be provided with a slot (4) that runs through the top and bottom. The slot (4) shall be a fan-shaped ring. The inner arc and outer arc of the fan-shaped ring shall be concentric with the magnet collector body and its central hole (2); the walls of the slot (4) shall be coated with a heat-resistant insulating layer. An auxiliary heat dissipation device shall be provided in the slot (4); a weldment (6) and a welded part (7) shall be fixed in the central hole (2). The front end of the weldment (6) shall have a hollow section. The welded part (7) shall be inserted into the weldment (6); when the welded part (7) is a pipe, an insulating rubber column (8) shall be inserted inside the welded part (7).

2. The splicing hollow magnet collector for joint welding according to claim 1, characterized in that: The thickness of both the inner and outer walls of the magnetic collecting module (1) is not less than 1 / 4 of the overall thickness.

3. A splicing hollow magnet collector for joint welding according to claim 1, characterized in that: The magnet collector body is made of copper alloy material, and the coil (5) is a copper coil.

4. A splicing hollow magnet collector for joint welding according to claim 1, characterized in that: The sidewalls of several magnet collecting modules (1) of the magnet collector body are aligned.

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