Electromagnetic pulse micro spot welding equipment capable of highly accurate magnetic field convergence

Abstract

Provided is an electromagnetic pulse micro spot welding device capable of converging a magnetic field with high precision, which can prevent the generation of excessive Joule heat, converge the magnetic field, and facilitate welding with different precision. [Solution] An electromagnetic pulse micro spot welding device capable of high-precision magnetic field convergence includes a housing (25), a workpiece (1), a workpiece, a movable case (3), a pulse power supply, a coil, and a shield case (6), wherein the pulse power supply is provided inside the movable case, the coil is provided inside the movable case, a first magnetic field concentrator is provided below the coil, a second magnetic field concentrator is provided below the first magnetic field concentrator, and a third magnetic field concentrator is provided below the second magnetic field concentrator, and the first magnetic field concentrator, second magnetic field concentrator, and third magnetic field concentrator are all located inside the shield case, and an adjustment unit is provided inside the shield case and a cooling unit is provided outside.

Description

[Technical Field]

[0001] The present application relates to the technical field of electromagnetic pulse welding, and more specifically to an electromagnetic pulse micro spot welding apparatus capable of highly accurate magnetic field focusing. [Background technology]

[0002] The existing document CN114682898A provides an electromagnetic pulse welding apparatus for electronic packaging, which starts a pulse power supply, generates a pulsed magnetic field in a coil, generates a current in a pin, and generates a repulsive force between the pin and a magnetic field concentrator. After energizing the pulse power supply for a preset time, the pulse power supply is turned off, and the pin is welded to the welding spot. However, in this technology, the current density in the magnetic field concentrator is high during electromagnetic pulse welding, generating a large amount of Joule heat, which affects welding quality, and the magnetic field convergence effect during welding is poor, making it impossible to perform relatively fine welding. Summary of the Invention [Problem to be solved by the invention]

[0003] An object of the present application is to provide an electromagnetic pulse micro spot welding apparatus capable of highly accurate magnetic field convergence. [Means for solving the problem]

[0004] The present invention adopts the following technical solutions:

[0005] The electromagnetic pulse micro spot welding device capable of highly accurate magnetic field convergence includes a housing, a processing plate, a workpiece, a moving case, a pulse power source, a coil, and a shield case, and the processing plate is attached inside the housing. The moving case is located above the processing plate, The workpiece is located on the surface of the workpiece plate. The pulse power supply is provided inside the moving case, The coil is provided inside the moving case so as to be located below the pulse power supply, The shield case is provided below the moving case, A first magnetic field concentrator is provided below the coil; A second magnetic field concentrator is provided below the first magnetic field concentrator, A third magnetic field concentrator is provided below the second magnetic field concentrator, the first magnetic field concentrator, the second magnetic field concentrator, and the third magnetic field concentrator are all located inside the shield case; An adjustment section is provided inside the shield case, and a cooling section is provided outside.

[0006] Preferably, the first magnetic field concentrator, the second magnetic field concentrator, and the third magnetic field concentrator all have a funnel structure with a large upper cross-sectional area and a small lower cross-sectional area.

[0007] Preferably, the upper end of the second magnetic field concentrator and the lower end of the first magnetic field concentrator can be brought into close contact with each other and have the same cross-sectional area; The upper end of the third magnetic field concentrator and the lower end of the second magnetic field concentrator can be in close contact with each other and have the same cross-sectional area.

[0008] the adjustment unit includes an upper fixing ring and a lower fixing ring for moving the second magnetic field concentrator and the third magnetic field concentrator; The upper fixing ring is in close contact with the outer surface of the second magnetic field concentrator, The upper fixing ring is provided with a first adjusting air cylinder connected to the shield case; The lower fixed ring is attached to the outer surface of the third magnetic field concentrator. The lower fixing ring is provided with a second adjusting air cylinder connected to the shield case.

[0009] Preferably, both the upper and lower retaining rings are made of an insulating material.

[0010] the cooling unit includes a cooling pipe, a branch pipe, and a fan to prevent the first magnetic field concentrator, the second magnetic field concentrator, and the third magnetic field concentrator from overheating during welding, the fan being connected to the moving case so as to be located above the moving case; One end of the cooling pipe is connected to the output end of the fan, and the other end is connected to the shield case. The branch pipe has one end communicating with the cooling pipe and the other end communicating with the shield case.

[0011] A moving block and a limit rod are provided above the moving case to further adjust the position of the moving case; The limit rod passes through the moving block and has one end connected to the moving case. A moving air cylinder, the output end of which is connected to the moving case, is connected to the upper side of the moving block.

[0012] Preferably, a moving frame is slidably connected to the outside of the moving block; A horizontal screw rod is provided inside the moving frame, The moving block is screwed with the horizontal screw rod, A lateral movement motor is connected to one end of the lateral screw rod.

[0013] Preferably, the moving frame is slidably connected to the processing plate; A vertical threaded rod is provided inside the processing plate, The vertical threaded rod is screwed into the moving frame, A vertical movement motor is connected to one end of the vertical threaded rod.

[0014] To improve the safety of the device, the inner wall of the housing is fitted with insulating pads, A door body having an observation window on its surface is attached to one side of the housing.

[0015] Beneficial effects A fan blows room-temperature air into the shield case through the cooling pipe and branch pipe to cool the first, second, and third magnetic field concentrators, preventing excessive Joule heat that could affect welding quality. The first adjustable air cylinder moves the upper fixing ring so that the upper end of the second magnetic field concentrator fits tightly against the lower end of the first magnetic field concentrator, and the second adjustable air cylinder moves the lower fixing ring so that the upper end of the third magnetic field concentrator fits tightly against the lower end of the second magnetic field concentrator. The first, second, and third magnetic field concentrators all have a funnel structure with a large cross-sectional area at the top and a small cross-sectional area at the bottom. This significantly increases the number of magnetic field lines passing through each unit area at the bottom, converging the magnetic field and facilitating welding with different precision. [Brief explanation of the drawings]

[0016] [Figure 1] 1 is a schematic diagram of the three-dimensional structure of an electromagnetic pulse micro spot welding device capable of highly accurate magnetic field convergence according to the present application. [Figure 2] 1 is a schematic diagram of the three-dimensional structure of an electromagnetic pulse micro spot welding device capable of highly accurate magnetic field convergence according to the present application, with the housing removed; [Figure 3] 1 is a front view of an electromagnetic pulse micro spot welding apparatus capable of highly accurate magnetic field convergence according to the present application, with the housing removed; FIG. [Figure 4] 1 is a plan view of an electromagnetic pulse micro spot welding apparatus capable of highly accurate magnetic field convergence according to the present application, with the housing removed; FIG. [Figure 5] FIG. 4 is a structural cross-sectional view taken along line AA in FIG. 3 of the present invention. [Figure 6] FIG. 5 is a partially enlarged view of B in FIG. 4 of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0017] The technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings.

[0018] As shown in Figures 1 to 6, an electromagnetic pulse micro spot welding device capable of high-precision magnetic field convergence includes a housing 25, a workpiece 1, a workpiece 2, a movable case 3, a pulsed power supply 4, a coil 5, and a shield case 6. The workpiece 1 is attached inside the housing 25, the movable case 3 is located above the workpiece 1, the workpiece 2 is located on the surface of the workpiece 1, the pulsed power supply 4 is provided inside the movable case 3, the coil 5 is provided inside the movable case 3 so as to be located below the pulsed power supply 4, the shield case 6 is provided below the movable case 3, a first magnetic field concentrator 7 is provided below the coil 5, a second magnetic field concentrator 8 is provided below the first magnetic field concentrator 7, and a third magnetic field concentrator 9 is provided below the second magnetic field concentrator 8. The first magnetic field concentrator 7, the second magnetic field concentrator 8, and the third magnetic field concentrator 9 are all located inside the shield case 6, and the shield case 6 has an adjustment unit inside and a cooling unit outside.

[0019] Each of the first magnetic field concentrator 7, the second magnetic field concentrator 8, and the third magnetic field concentrator 9 has a funnel structure with a large upper cross-sectional area and a small lower cross-sectional area.

[0020] The upper end of the second magnetic field concentrator 8 and the lower end of the first magnetic field concentrator 7 can be closely fitted to each other and have the same cross-sectional area, and the upper end of the third magnetic field concentrator 9 and the lower end of the second magnetic field concentrator 8 can be closely fitted to each other and have the same cross-sectional area.

[0021] Of these, the adjustment part includes an upper fixed ring 10 and a lower fixed ring 11, the upper fixed ring 10 being in close contact with the outer surface of the second magnetic field concentrator 8, and the upper fixed ring 10 being provided with a first adjustment air cylinder 12 connected to the shield case 6, and the lower fixed ring 11 being in close contact with the outer surface of the third magnetic field concentrator 9, and the lower fixed ring 11 being provided with a second adjustment air cylinder 13 connected to the shield case 6.

[0022] Both the upper fixing ring 10 and the lower fixing ring 11 are made of an insulating material.

[0023] The cooling section includes a cooling pipe 14, a branch pipe 15, and a fan 16, the fan 16 is connected to the movable case 3 so as to be positioned above the movable case 3, the cooling pipe 14 has one end connected to the output end of the fan 16 and the other end connected to the shield case 6, and the branch pipe 15 has one end connected to the cooling pipe 14 and the other end connected to the shield case 6.

[0024] A moving block 17 and a limit rod 18 are provided above the moving case 3, and the limit rod 18 passes through the moving block 17 and has one end connected to the moving case 3. A moving air cylinder 19 is connected above the moving block 17, and its output end is connected to the moving case 3.

[0025] A moving frame 20 is slidably connected to the outside of the moving block 17, and a horizontal screw rod 21 is provided inside the moving frame 20. The moving block 17 is screwed onto the horizontal screw rod 21, and a horizontal movement motor 22 is connected to one end of the horizontal screw rod 21.

[0026] The moving frame 20 is slidably connected to the processing plate 1, and a vertical threaded rod 23 is provided inside the processing plate 1, and the vertical threaded rod 23 is screwed into the moving frame 20, and a vertical movement motor 24 is connected to one end of the vertical threaded rod 23.

[0027] An insulating pad 27 is attached to the inner wall of the housing 25, and a door body 26 having an observation window 28 on its surface is attached to one side of the housing 25.

[0028] By using fan 16 to blow room temperature air into shield case 6 through cooling pipe 14 and branch pipe 15, first magnetic field concentrator 7, second magnetic field concentrator 8, and third magnetic field concentrator 9 can be cooled and the generation of excessive Joule heat that affects welding quality can be prevented.

[0029] During welding, the door 26 is closed. An insulating pad 27 on the inner wall of the housing 25 protects the operator, and a viewing window 28 allows the operator to observe the internal structure of the housing from the outside. The pulsed power supply 4 emits a high-energy, short-duration pulse current into the coil 5. According to the law of electromagnetic induction, a strong, rapidly changing magnetic field is instantaneously generated around the coil 5. The funnel-shaped first magnetic field concentrator 7, second magnetic field concentrator 8, and third magnetic field concentrator 9 converge the dispersed magnetic field generated by the coil 5 from a larger cross section to a smaller cross section. As a result, the magnetic field strength is concentrated in the welding spot area, and the energy of the workpiece 2 to be welded is highly concentrated under the effect of concentrating the magnetic field. The fresh metal surfaces after plastic deformation come into intimate contact with each other under instantaneous pressure, forming a solid-state bond through atomic diffusion and bonding, completing the welding process.

[0030] Magnetic field lines have the characteristic of "converging along a conductor" (similar to the path of an electric current). The larger-than-average-top, smaller-than-average-bottom structure induces the magnetic field lines of the primary and secondary magnetic fields to gradually converge from a "dispersed" state at the top to a narrower area at the bottom (similar to how a funnel induces water flow from a wide opening to a narrower opening). This induces a significant increase in the number of magnetic field lines passing through per unit area at the bottom (magnetic flux density, i.e., magnetic induction strength). To converge the magnetic field, the first adjustable air cylinder 12 moves the upper fixing ring 10 so that the top of the second magnetic field concentrator 8 is tightly fitted to the bottom of the first magnetic field concentrator 7. At this time, the cross-section of the bottom of the second magnetic field concentrator 8 becomes smaller than that of the first magnetic field concentrator 7, resulting in the convergence of the magnetic field. Furthermore, the second adjustable air cylinder 13 moves the lower fixing ring 11 so that the upper end of the third magnetic field concentrator 9 is in close contact with the lower end of the second magnetic field concentrator 8. At this time, the cross section of the lower end of the third magnetic field concentrator 9 becomes smaller than the cross section of the lower end of the second magnetic field concentrator 8, so that the magnetic field is further concentrated. This makes it easier to perform finer welding.

[0031] The electromagnetic pulse micro spot welding device of the present invention, which is capable of high-precision magnetic field convergence, not only improves welding quality, but more importantly, it can achieve welding with different precision, making it more practical than conventional electromagnetic pulse micro spot welding devices. [Explanation of symbols]

[0032] 1 Processed plate 2 Work 3 Travel Case 4 Pulse power supply 5 coils 6 Shielding case 7 First magnetic field concentrator 8 Second magnetic field concentrator 9 Third magnetic field concentrator 10 Upper fixing ring 11 Lower fixing ring 12 First adjusting air cylinder 13 Second adjusting air cylinder 14 Cooling pipe 15 Branch pipe 16 Fans 17 Moving Blocks 18 Limit Rod 19 Moving Air Cylinder 20 moving frames 21 Horizontal threaded rod 22 Lateral movement motor 23 Vertical threaded rod 24 Vertical movement motor 25 Housing 26 Door body 27 Insulating plate 28 Peephole

Claims

1. An electromagnetic pulse micro spot welding device capable of highly accurate magnetic field convergence, comprising a housing (25), a workpiece (1), a workpiece (2), a moving case (3), a pulse power source (4), a coil (5), and a shield case (6), The working plate (1) is mounted inside the housing (25), The moving case (3) is located above the processing plate (1), The workpiece (2) is located on the surface of the processing plate (1), The pulse power supply (4) is provided inside the moving case (3), The coil (5) is provided inside the moving case (3) so as to be located below the pulse power supply (4), The shield case (6) is provided below the moving case (3), A first magnetic field concentrator (7) is provided below the coil (5), A second magnetic field concentrator (8) is provided below the first magnetic field concentrator (7), A third magnetic field concentrator (9) is provided below the second magnetic field concentrator (8), The first magnetic field concentrator (7), the second magnetic field concentrator (8), and the third magnetic field concentrator (9) are all located inside the shield case (6), An adjustment unit is provided inside the shield case (6), and a cooling unit is provided outside the shield case (6). Electromagnetic pulse micro spot welding equipment capable of highly accurate magnetic field convergence.

2. The first magnetic field concentrator (7), the second magnetic field concentrator (8), and the third magnetic field concentrator (9) all have a funnel structure with a large upper cross-sectional area and a small lower cross-sectional area.

2. The electromagnetic pulse micro spot welding device according to claim 1, which is capable of highly accurate magnetic field convergence.

3. The upper end of the second magnetic field concentrator (8) and the lower end of the first magnetic field concentrator (7) can be brought into close contact with each other and have the same cross-sectional area; The upper end of the third magnetic field concentrator (9) and the lower end of the second magnetic field concentrator (8) can be brought into close contact with each other and have the same cross-sectional area.

3. The electromagnetic pulse micro spot welding apparatus according to claim 2, which is capable of highly accurate magnetic field convergence.

4. The adjustment part includes an upper fixing ring (10) and a lower fixing ring (11), The upper fixing ring (10) is in close contact with the outer surface of the second magnetic field concentrator (8), The upper fixing ring (10) is provided with a first adjusting air cylinder (12) connected to the shield case (6); The lower fixing ring (11) is in close contact with the outer surface of the third magnetic field concentrator (9), The lower fixing ring (11) is provided with a second adjusting air cylinder (13) connected to the shield case (6).

2. The electromagnetic pulse micro spot welding device according to claim 1, which is capable of highly accurate magnetic field convergence.

5. The cooling unit includes a cooling pipe (14), a branch pipe (15), and a fan (16). The fan (16) is connected to the moving case (3) so as to be located above the moving case (3); One end of the cooling pipe (14) is connected to the output end of the fan (16), and the other end is connected to the shield case (6). One end of the branch pipe 15 communicates with the cooling pipe (14), and the other end communicates with the shield case (6).

2. The electromagnetic pulse micro spot welding device according to claim 1, which is capable of highly accurate magnetic field convergence.

6. A moving block (17) and a limit rod (18) are provided above the moving case (3), The limit rod (18) passes through the moving block (17) and has one end connected to the moving case (3), Above the moving block (17), a moving air cylinder (19) is connected, the output end of which is connected to the moving case (3).

2. The electromagnetic pulse micro spot welding device according to claim 1, which is capable of highly accurate magnetic field convergence.

7. A moving frame (20) is slidably connected to the outside of the moving block (17), A horizontal screw rod (21) is provided inside the moving frame (20), The moving block (17) is screwed with the horizontal threaded rod (21), A horizontal movement motor (22) is connected to one end of the horizontal threaded rod (21), The moving frame (20) is slidably connected to the processing plate (1), A vertical threaded rod (23) is provided inside the processing plate (1), The vertical threaded rod (23) is threadedly engaged with the moving frame (20), A vertical movement motor (24) is connected to one end of the vertical threaded rod (23), An insulating pad (27) is attached to the inner wall of the housing (25), A door body (26) having an observation window (28) on its surface is attached to one side of the housing (25).

7. The electromagnetic pulse micro spot welding apparatus according to claim 6, which is capable of highly accurate magnetic field convergence.

Images