Neodymium-iron-boron magnet welding jig capable of inhibiting welding object from splashing

Abstract

The utility model discloses a neodymium-iron-boron magnet welding jig for inhibiting welding object splashing, which is characterized in that a placing groove is formed on the top surface of a jig main body, the placing groove extends transversely and is used for placing a plurality of neodymium-iron-boron magnets, the top surfaces of the neodymium-iron-boron magnets are exposed out of the placing groove, a laser penetrating plate is used for covering the top surfaces of the neodymium-iron-boron magnets, and laser can penetrate through the laser penetrating plate. And the laser can be used for welding the adjacent neodymium-iron-boron magnets below the laser penetrating plate. The laser penetrating plate covers the top surface of the neodymium-iron-boron magnet, so that the generation of metal splashes can be effectively inhibited, movable metal particles are prevented from being formed on the surface of a magnet product, and the appearance and the size of the welded magnet are further ensured.

Description

Technical Field

[0001] This utility model relates to the technical field of NdFeB laser welding, and in particular to a welding fixture for NdFeB magnets that suppresses spatter in the weld. Background Technology

[0002] like Figure 1-2 As shown, during the nanosecond pulsed laser welding process of sintered NdFeB magnets, molten metal spatter is generated when the high-energy laser acts on the surface of the sintered NdFeB magnet. The molten metal spatter gradually cools during its flight and is subsequently captured by a strong magnetic field, accumulating in the gaps of the magnet product, thus generating movable metal particles (with a diameter of 10-18 μm). Some of the metal spatter falls onto the magnet surface in a molten state, melting the coating. After cooling, it forms immovable metal pits or protrusions, affecting the appearance and size of the magnet itself. This causes problems for the application of the welded product in high-precision fields.

[0003] In existing technologies, high-pressure blowing or suction is used to process movable metal particles. However, since the movable metal particles are captured and adsorbed onto the surface by the strong magnetic field of the magnet, this method cannot effectively reduce the number of movable metal particles and cannot effectively solve the problem of the impact of movable metal particles generated during nanosecond pulse welding on the magnet surface.

[0004] This case arose in response to the aforementioned technical issues. Utility Model Content

[0005] The purpose of this invention is to provide a welding fixture for neodymium iron boron magnets that suppresses spatter during welding. The technical problem to be solved is to provide a fixture that can suppress the generation of metal spatter during welding.

[0006] To achieve the above objectives, the solution of this utility model is: a welding fixture for neodymium iron boron magnets that suppresses spatter, comprising a fixture body and a laser penetrating plate;

[0007] The main body of the fixture has a placement groove on its top surface. The placement groove extends laterally to accommodate multiple neodymium iron boron magnets. The top surface of the neodymium iron boron magnets protrudes from the placement groove. A laser penetrating plate is used to cover the top surface of the neodymium iron boron magnets. The laser penetrating plate allows the laser to pass through, enabling the laser to weld the adjacent neodymium iron boron magnets located below the laser penetrating plate.

[0008] Furthermore, the laser-penetrating plate is made of quartz glass.

[0009] Furthermore, the depth of the placement groove is consistent with the height of the neodymium iron boron magnet, so that after the laser penetrating plate is placed on the top surface of the fixture body, its bottom surface is in contact with the top surface of the neodymium iron boron magnet.

[0010] Furthermore, one side of the laser penetration plate protrudes from the outer wall of the fixture body.

[0011] Furthermore, a magnetic strip is installed on the side of the fixture body away from the placement groove. The magnetic strip is used to attract and fix the neodymium iron boron magnet.

[0012] Furthermore, the length of the magnetic strip should be at least the same as the length of the placement slot.

[0013] Furthermore, the bottom surface of the fixture body has a mounting groove, the mounting groove corresponds to the placement groove, the outer contour of the magnetic strip is consistent with the inner contour of the mounting groove, and the magnetic strip is used to embed into the mounting groove.

[0014] Furthermore, the top surface of the fixture body is also provided with a positioning groove. The positioning groove is located on one side of the placement groove, spaced apart from the placement groove, and is located on the extension path of the placement groove. The positioning groove is used to place the positioning magnet, so that after the laser identifies the positioning magnet, it can move along the extension direction of the placement groove to the top of the placement groove, so that adjacent neodymium iron boron magnets can be welded in sequence.

[0015] Furthermore, there are multiple placement slots, which are parallel to each other and spaced apart, with one placement slot corresponding to one positioning slot.

[0016] The beneficial effects of this utility model after adopting the above solution are as follows: a placement groove is formed on the top surface of the fixture body, the placement groove extends laterally, multiple neodymium iron boron magnets are placed in the placement groove, and the top surface of the placement groove is exposed. The laser penetration plate can cover the top surface of the neodymium iron boron magnets. During nanosecond pulse laser welding, the laser penetration plate allows the laser to pass through, enabling the laser to weld adjacent neodymium iron boron magnets located below the laser penetration plate. Since the laser penetration plate covers the top surface of the neodymium iron boron magnets, during welding, the welded material between adjacent neodymium iron boron magnets cannot splash to form metal spatter, thereby suppressing the generation of metal spatter and effectively solving the problem of movable metal particles forming on the surface of magnet products, thus ensuring the appearance and size of the welded magnets. Attached Figure Description

[0017] Figure 1 These are movable metal particles produced during welding using existing technologies.

[0018] Figure 2 These are immovable metal pits or protrusions formed after welding and cooling using existing technologies.

[0019] Figure 3 This is a three-dimensional structural diagram of the fixture body of this utility model after placing neodymium iron boron magnets.

[0020] Figure 4 This is a three-dimensional structural diagram of the laser-penetrating plate of this utility model covering the neodymium iron boron magnet.

[0021] Figure 5 This is an exploded structural diagram of the main body of the fixture of this utility model from another angle.

[0022] Figure 6 This is a schematic diagram of the metallographic structure of a neodymium iron boron magnet after it has been welded with quartz glass.

[0023] Figure 7 This is a schematic diagram of the metallographic structure of a neodymium iron boron magnet after welding without the quartz glass placed on it.

[0024] Labeling explanation: 1- Fixture body, 2- Laser penetrating plate, 3- Neodymium iron boron magnet, 4- Magnetic strip, 5- Positioning magnet, 11- Placement slot, 12- Mounting slot, 13- Positioning slot. Detailed Implementation

[0025] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0026] Unless otherwise expressly defined, the use of directional terms such as "center," "lateral," "longitudinal," "horizontal," "vertical," "top," "bottom," "inner," "outer," "upper," "lower," "front," "rear," "left," "right," "clockwise," and "counterclockwise" in the claims, description, and accompanying drawings of this invention is merely for the convenience of describing the invention and simplifying the description, and is not intended to indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the specific scope of protection of this invention.

[0027] like Figure 3-7 As shown, this utility model provides a welding fixture for neodymium iron boron magnets to suppress spatter, including a fixture body 1 and a laser penetrating plate 2; a placement groove 11 is formed on the top surface of the fixture body 1, the placement groove 11 extends laterally to accommodate multiple neodymium iron boron magnets 3, with the top surface of the neodymium iron boron magnets 3 protruding from the placement groove 11; the laser penetrating plate 2 is used to cover the top surface of the neodymium iron boron magnets 3, and the laser penetrating plate 2 allows the laser to pass through, enabling the laser to perform welding processing on the adjacent neodymium iron boron magnets 3 located below the laser penetrating plate 2, such as... Figure 4 As shown, the arrow represents the laser. Specifically, the laser penetrating plate 2 can be made of quartz glass or sapphire glass. During the nanosecond pulse laser welding process, since the laser penetrating plate 2 covers the top surface of the neodymium iron boron magnet 3, the welded material cannot splatter, which can effectively suppress the generation of metal spatter and avoid the generation of movable metal spatter, thereby ensuring the appearance and dimensions of the neodymium iron boron magnet 3.

[0028] Key points combined Figure 3As shown, the placement groove 11 extends in a straight line, and multiple neodymium iron boron magnets 3 are placed sequentially along the extension direction of the placement groove 11. The top surface of the fixture body 1 is also provided with a positioning groove 13. The positioning groove 13 is located on one side of the placement groove 11, spaced apart from the placement groove 11, and located on the extension path of the placement groove 11. The positioning groove 13 is used to place the positioning magnet 5 so that after the laser identifies the positioning magnet 5, it can move along the extension direction of the placement groove 11 to move above the placement groove 11 and penetrate downward through the laser penetrating plate 2, so that the adjacent neodymium iron boron magnets 3 located below the laser penetrating plate 2 can be laser welded sequentially. Specifically, the laser identification of the positioning magnet 5 is existing technology and will not be described in detail. There are multiple placement grooves 11, which are parallel to each other and spaced apart. The number of placement grooves 11 is preferably 4, but it can also be 2, 3 or 5, etc., without specific limitation. One placement groove 11 corresponds to one positioning groove 13.

[0029] In this specific embodiment, the depth of the placement groove 11 is consistent with the height of the neodymium iron boron magnet 3, so that after the laser penetrating plate 2 is placed on the top surface of the fixture body 1, its bottom surface is in contact with the top surface of the neodymium iron boron magnet 3. In use, multiple neodymium iron boron magnets 3 are placed in the placement groove 11 in sequence. After the neodymium iron boron magnets 3 are placed in the placement groove 11, the top surface of the neodymium iron boron magnet 3 is flush with the top surface of the fixture body 1. Then the laser penetrating plate 2 is placed on the top surface of the fixture body 1, so that the bottom surface of the laser penetrating plate 2 is in contact with the top surface of the neodymium iron boron magnet 3.

[0030] Key points combined Figure 4 As shown, in order to facilitate the handling or placement of the laser penetration plate 2, at least one side of the laser penetration plate 2 protrudes from the outer wall of the fixture body 1.

[0031] Preferably, a magnetic strip 4 is installed on the side of the fixture body 1 away from the placement groove 11. The magnetic strip 4 is used to attract and fix the neodymium iron boron magnets 3. The length of the magnetic strip 4 is at least the same as the length of the placement groove 11, which can ensure that all neodymium iron boron magnets 3 in the placement groove 11 are attracted and fixed.

[0032] Key points combined Figure 5 As shown, the bottom surface of the fixture body 1 has a mounting groove 12. The size of the mounting groove 12 is the same as that of the placement groove 11, and the two are positioned correspondingly. The outer contour of the magnetic strip 4 is the same as the inner contour of the mounting groove 12. The magnetic strip 4 is embedded in the mounting groove 12 so that the magnetic strip 4 can attract and fix the neodymium iron boron magnet 3.

[0033] Preferably, the laser penetrating plate 2 is made of quartz glass. Quartz glass has a high light transmittance of ≥95%, high temperature resistance, long-term high temperature resistance of 1200℃, short-term high temperature resistance of 1450℃, and low cost, which can meet the needs of mass production.

[0034] Based on Table 1-3, the performance of NdFeB magnets was compared between two welding methods: welding with quartz glass placed on the top surface of the NdFeB magnet 3 and welding directly without placing quartz glass.

[0035] Table 1 is a comparison of the magnetic properties of the table with and without quartz glass.

[0036]

[0037] Table 1 shows that both were welded using nanosecond pulsed lasers. The solid line represents the surface magnetic field of the NdFeB magnets after welding with quartz glass, and the dashed line represents the surface magnetic field of the NdFeB magnets after welding without quartz glass. It can be seen that the average surface magnetic field of the magnets after welding with quartz glass is 3174 Gs, and the average surface magnetic field of the magnets after welding without quartz glass is 3177 Gs. The difference between the two is 3 Gs, and the standard error range is ≤100 Gs. 3 Gs ≤ 100 Gs, which meets the error requirements. Here, Gs is the unit of magnetic induction intensity.

[0038] Table 2 is a comparison table of bonding strength performance data between those with and without quartz glass.

[0039]

[0040] Table 2 shows that both methods used nanosecond pulsed laser welding. The solid line represents the bonding strength of the NdFeB magnet products after welding with quartz glass, while the dashed line represents the bonding strength of the NdFeB magnet products after welding without quartz glass. It can be seen that the average bonding strength of the NdFeB magnet products after welding with quartz glass is 59.7N, while the average bonding strength of the NdFeB magnet products after welding without quartz glass is 58.5N, a difference of 0.8N, which meets the requirements.

[0041] Table 3 shows the comparison of the test results after being placed in a constant temperature and humidity chamber at 85℃ and 85% relative humidity for 240 hours.

[0042]

[0043] As can be seen from Table 3, neither the neodymium iron boron magnets with quartz glass nor those without quartz glass exhibited any rusting or delamination after welding, thus meeting the performance requirements.

[0044] Key points combined Figure 6 and Figure 7 As shown, in the metallographic experiment, metallographic sections were taken from magnets produced by the two welding processes respectively. Figure 6 Metallographic image of a neodymium iron boron magnet product after welding to hold quartz glass. Figure 7 The image shows a metallographic image of a neodymium iron boron magnet product that was welded directly without the quartz glass. It can be seen that, under an electron microscope, no through cracks were observed at the weld seam, indicating that the placement of quartz glass during welding does not affect the structural performance of the neodymium iron boron magnet product.

[0045] In summary, placing quartz glass during welding will not affect the performance of NdFeB magnets. However, by placing quartz glass on the top surface of the NdFeB magnet 3, it is possible to prevent the formation of metal spatter during welding, effectively suppressing the generation of metal spatter. This effectively solves the problem of movable metal particles forming on the surface of NdFeB magnet products, ensuring the surface appearance and dimensions of NdFeB magnet products, and guaranteeing the quality of NdFeB magnet products.

[0046] The above description is only a preferred embodiment of this utility model and is not intended to limit the design of this case. All equivalent changes made based on the key design of this case shall fall within the protection scope of this case.

Claims

1. A welding fixture for neodymium iron boron magnets to suppress spatter in welds, characterized in that: It includes the main body of the fixture (1) and the laser penetrating plate (2); The fixture body (1) has a placement groove (11) on its top surface. The placement groove (11) extends laterally to accommodate multiple neodymium iron boron magnets (3). The top surface of the neodymium iron boron magnets (3) is exposed in the placement groove (11). A laser penetrating plate (2) is used to cover the top surface of the neodymium iron boron magnets (3). The laser penetrating plate (2) allows the laser to pass through, enabling the laser to perform welding on the adjacent neodymium iron boron magnets (3) located below the laser penetrating plate (2).

2. The welding fixture for neodymium iron boron magnets as described in claim 1, characterized in that: The laser penetrating plate (2) is made of quartz glass.

3. The welding fixture for neodymium iron boron magnets as described in claim 1, characterized in that: The depth of the placement groove (11) is consistent with the height of the neodymium iron boron magnet (3) so that after the laser penetrating plate (2) is placed on the top surface of the fixture body (1), its bottom surface is in contact with the top surface of the neodymium iron boron magnet (3).

4. The welding fixture for neodymium iron boron magnets to suppress spatter as described in claim 3, characterized in that: The laser penetrating plate (2) protrudes from one side of the outer wall of the fixture body (1).

5. The welding fixture for neodymium iron boron magnets as described in claim 1, characterized in that: A magnetic strip (4) is installed on the side of the fixture body (1) away from the placement groove (11). The magnetic strip (4) is used to attract and fix the neodymium iron boron magnet (3).

6. The welding fixture for neodymium iron boron magnets as described in claim 5, characterized in that: The length of the magnetic strip (4) is at least the same as the length of the placement groove (11).

7. The welding fixture for neodymium iron boron magnets as described in claim 6, characterized in that: The bottom surface of the fixture body (1) has an installation groove (12) which corresponds to the placement groove (11). The outer contour of the magnetic strip (4) is consistent with the inner contour of the installation groove (12), and the magnetic strip (4) is used to be embedded in the installation groove (12).

8. The welding fixture for neodymium iron boron magnets as described in claim 1, characterized in that: The top surface of the fixture body (1) is also provided with a positioning groove (13). The positioning groove (13) is located on one side of the placement groove (11) and is spaced apart from the placement groove (11). The positioning groove (13) is located on the extension path of the placement groove (11). The positioning groove (13) is used to place the positioning magnet (5). After the laser identifies the positioning magnet (5), it can move along the extension direction of the placement groove (11) to the top of the placement groove (11) so that the adjacent neodymium iron boron magnets (3) can be welded in sequence.

9. The welding fixture for neodymium iron boron magnets as described in claim 8, characterized in that: The number of placement slots (11) is multiple, and the multiple placement slots (11) are parallel to each other and spaced apart. Each placement slot (11) corresponds to a positioning slot (13).

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