Manufacturing method of a shielding magnet and a shielding magnet manufactured based thereon

Abstract

The present invention relates to a manufacturing method of a shielding magnet and a shielding magnet manufactured based thereon, and relates to a manufacturing method of a shielding magnet with simple manufacturing processes, high design freedom, low rejection rate and low manufacturing cost, and a shielding magnet manufactured based thereon.

Description

Technical Field

[0001] The present invention relates to a method for manufacturing a shielding magnet and a shielding magnet manufactured based thereon, and relates to a method for manufacturing a shielding magnet with simple manufacturing processes, high design freedom, low rejection rate, and low manufacturing cost, and a shielding magnet manufactured based thereon. Background Art

[0002] Generally, as the sizes of liquid crystal displays of mobile devices such as smart phones and tablet personal computers (PCs) gradually increase, in order to protect the screens and appearances of the terminals, various types of protective cases have been manufactured and installed on the corresponding mobile devices. For example, the most widely used wallet-shaped protective case covers the front, back, and one side of the mobile device with leather or artificial leather, and exposes the screen of the corresponding mobile device by selectively opening and closing the front surface.

[0003] A shielding magnet is built into such a portable device and the protective case. Therefore, not only is the opening and closing of the protective case realized, but also the corresponding mobile device automatically operates to increase the convenience of the user.

[0004] Existing shielding magnets are manufactured by the following method: after a plate-shaped lower shielding part is attached with a hot-melt double-sided tape, a ring-shaped upper shielding part is joined to the hot-melt double-sided tape, and then a magnet is inserted into the ring of the upper shielding part and welded to the hot-melt double-sided tape and cooled. As described above, the manufacturing method of the existing shielding magnet needs to perform joining processes, welding processes, cooling processes, etc., so there is a problem of complicated processes. And when assembling the upper shielding part and the lower shielding part, it is difficult to match the integration between the upper shielding part and the lower shielding part, resulting in misalignment, etc. between them, so there is a problem of an increased rejection rate. And in the existing method, since a hot-melt double-sided tape needs to be used for attachment, not only a hot-melt welding machine is required, but also equipment such as a welding jig is required to match the integration between the upper shielding part and the lower shielding part. Summary of the Invention

[0005] Technical Problem

[0006] An object of the present invention is to provide a method for manufacturing a shielding magnet with simple manufacturing processes, high design freedom, low rejection rate, and low manufacturing cost.

[0007] Another object of the present invention is to provide a shielding magnet manufactured by the above manufacturing method.

[0008] Solution to the Problem

[0009] To achieve the above object, the manufacturing method of the shielding magnet provided by the present invention includes the following steps: forming a second magnetic shielding plate by press forging a first magnetic shielding plate, the second magnetic shielding plate including a magnet insertion groove and a protrusion, the magnet insertion groove being formed on one side, and the protrusion extending and protruding at a position on the other side corresponding to the position of the magnet insertion groove; forming a spare magnetic shielding unit by blanking the second magnetic shielding plate into a specified shape, the spare magnetic shielding unit including a body portion and a protrusion, the body portion having a magnet insertion groove formed on one side, and the protrusion extending and protruding from a part of the other side of the body portion; forming a magnetic shielding unit by cutting a part of the other side of the protrusion and the body portion of the spare magnetic shielding unit; and inserting a magnet into the magnet insertion groove of the magnetic shielding unit.

[0010] The above press forging can be cold press forging.

[0011] Moreover, the first magnetic shielding plate can be a magnetic shielding plate including a perforation portion and a magnetic shielding unit peripheral shape portion. In this case, when performing the above press forging, the magnet insertion groove is formed in the magnetic shielding unit peripheral shape portion.

[0012] Moreover, the thickness of the protrusion can be the same as the depth of the magnet insertion groove.

[0013] Moreover, the cutting thickness of the body portion can be in the range of 0 mm to 0.1 mm.

[0014] Moreover, after the above cutting, the manufacturing method may further include: grinding the magnetic shielding unit.

[0015] Moreover, before inserting the magnet, the manufacturing method may further include: plating the magnetic shielding unit.

[0016] In addition, the manufacturing method of the shielding magnet provided by the present invention includes the following steps: forming a first magnetic shielding plate by piercing a magnetic shielding plate, the first magnetic shielding plate including a perforation portion and a magnetic shielding peripheral shape portion; forming a spare magnetic shielding unit by press forging the magnetic shielding unit peripheral shape portion, the spare magnetic shielding unit having a magnet insertion groove formed on one side; forming a magnetic shielding unit by trimming the edge of the spare magnetic shielding unit; and inserting a magnet into the magnet insertion groove of the magnetic shielding unit.

[0017] The above press forging can be cold press forging.

[0018] Moreover, after the above trimming, the manufacturing method may further include: grinding the magnetic shielding unit.

[0019] And, before inserting the above-mentioned magnet, the above manufacturing method may further include: plating the above magnetic shielding unit.

[0020] Moreover, the shielding magnet provided by the present invention is manufactured based on the above method. The shielding magnet of the present invention includes: a magnet; and a magnetic shielding unit, which is formed with a magnet insertion groove for inserting the above magnet.

[0021] Effects of the Invention

[0022] In the manufacturing method of the shielding magnet of the present invention, the magnetic shielding unit is formed as an integral type instead of an assembled type. Therefore, not only is the manufacturing process simple, but also the design freedom is high, it is easy to implement the shape based on the thickness of the magnet, and the rejection rate of the shielding magnet can be reduced. Description of the Drawings

[0023] Figure 1 It is a flowchart for briefly showing the manufacturing method of the shielding magnet according to the first embodiment of the present invention.

[0024] Figures 2 to 4 It is a cross-sectional view for briefly showing each process of manufacturing the shielding magnet according to the first embodiment of the present invention.

[0025] Figure 5 It is a flowchart for briefly showing the manufacturing method of the shielding magnet according to the second embodiment of the present invention.

[0026] Figures 6 to 8 It is a cross-sectional view for briefly showing each process of manufacturing the shielding magnet according to the second embodiment of the present invention.

[0027] Figure 9 It is a cross-sectional view for briefly showing the shielding magnet manufactured based on the manufacturing method of the present invention.

[0028] Description of Reference Numerals

[0029] 10A: First magnetic shielding plate, 10B: Second magnetic shielding plate, 10C, 10D: Spare magnetic shielding units, 11: Perforated part, 12: Outer shape part of the magnetic shielding unit, 21: Upper mold, 22: Lower mold, 22a: Forming groove part, 30: Cutting device, 100: Magnetic shielding unit, 110: Magnet insertion groove, 120: Protrusion, 130A, 130B, 140: Body parts, 200: Magnet, 1000: Shielding magnet. Detailed Description of the Invention

[0030] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. The embodiments of the present invention are provided only for those of ordinary skill in the art in the technical field to which the present invention pertains to further fully understand the present invention. The following embodiments may have various implementation manners, and the scope of the present invention is not limited to the following embodiments. In this case, the same reference numerals are given to the same structures throughout the entire content of this specification.

[0031] Unless otherwise defined, all terms (including technical terms and scientific terms) used in this specification shall be used in accordance with the meanings commonly understood by those of ordinary skill in the art to which the present invention pertains. Also, unless clearly defined in this specification, terms defined in commonly used dictionaries shall not be interpreted in an idealized or overly formalized manner.

[0032] Moreover, for each structure shown in the drawings, the dimensions and thicknesses are randomly shown for the convenience of explanation on the side. Therefore, the present invention is not limited to the drawings. The thicknesses are enlarged to clearly show multiple layers and multiple regions in the drawings. Also, in the drawings, the thicknesses of some layers and regions are enlarged for ease of explanation.

[0033] Also, throughout the entire content of this specification, when a certain part "includes" a certain structural element, unless there is a particularly contrary description, it should be understood that other structural elements may also be included, rather than excluding other structural elements.

[0034] Also, throughout the entire content of this specification, expressions such as "on" or "above" not only indicate the situation of being above or below the object part, but also include the situation where there are other structural elements in the middle, and do not necessarily mean being in the upper position based on the direction of gravity.

[0035] Furthermore, in the specification of this application, terms such as "first" and "second" are used to distinguish multiple structural elements and do not represent any order or importance of the structural elements.

[0036] Figure 1 To briefly show a flowchart of a method for manufacturing a shielding magnet according to a first embodiment of the present invention, Figures 2 to 4 To briefly show cross-sectional views of the respective processes for manufacturing a shielding magnet according to a first embodiment of the present invention, Figure 5 To briefly show a flowchart of a method for manufacturing a shielding magnet according to a second embodiment of the present invention, Figures 6 to 8 To briefly show cross-sectional views of the respective processes for manufacturing a shielding magnet according to a second embodiment of the present invention, Figure 9 To briefly show a cross-sectional view of a shielding magnet manufactured according to the present invention.

[0037] Refer to Figures 1 to 9, The present invention relates to a manufacturing method of a shielding magnet. The above shielding magnet can strengthen the magnetic force in another direction by shielding the magnetic force in a specific direction, and is applicable to products such as mobile devices and protective cases. The pressure forging process and the cutting process are applied to form the magnetic shielding unit into an integral type instead of an assembled type with an upper part and a lower part. Thus, in the present invention, not only is the manufacturing process of the shielding magnet simple, but also the design freedom is high, it is easy to realize the shape based on the thickness of the magnet, and the manufacturing cost can be reduced by reducing the rejection rate of the shielding magnet.

[0038] As Figures 1 to 4 shown, the manufacturing method of the shielding magnet according to the first embodiment of the present invention includes: Step S100, forming a second magnetic shielding plate by press forging a first magnetic shielding plate. The above second magnetic shielding plate includes a magnet insertion groove and a protrusion. The above magnet insertion groove is formed on one side, and the above protrusion extends and protrudes at a position on the other side corresponding to the position of the above magnet insertion groove; Step S200, forming a spare magnetic shielding unit by blanking the second magnetic shielding plate. The above spare magnetic shielding unit includes a body part and a protrusion. The above body part is formed with a magnet insertion groove on one side, and the above protrusion extends and protrudes from a part of the other side of the above body part; Step S300, forming a magnetic shielding unit by cutting a part of the other side of the protrusion and the body part of the above spare magnetic shielding unit; and Step S400, inserting a magnet into the magnet insertion groove of the above magnetic shielding unit. Optionally, after the above cutting, the manufacturing method of the shielding magnet according to an example of the present invention may further include: grinding the magnetic shielding unit formed in the above step S200; and / or before inserting the above magnet, it may further include: plating the above magnetic shielding unit. However, it is not limited thereto. The above steps do not need to be executed in sequence, and the steps of each process can be changed according to the design specifications, or can be selectively executed in combination. In particular, there is no chronological order between Step S200, Step S300, and Step S400.

[0039] Hereinafter, with reference to Figures 1 to 4 , according to the first embodiment of the present invention, each step of the manufacturing method of the shielding magnet will be described.

[0040] Step S100: Pressure forging step

[0041] First, a second magnetic shielding plate 10B is formed by press forging a first magnetic shielding plate 10A. The above second magnetic shielding plate 10B includes a magnet insertion groove 110 and a protrusion 120. The magnet insertion groove 110 is formed on one side, and the protrusion 120 extends and is formed at a position on the other side corresponding to the position of the above magnet insertion groove.

[0042] AsFigure 2 As shown, after the first magnetic shielding part 10A is positioned between the upper die 21 and the lower die 22, if the upper die 21 is vertically moved toward the first magnetic shielding plate 10A side (lower the upper die 21) to press the first magnetic shielding plate 10A, a magnet insertion groove 110 with a specified depth is formed on the surface (e.g., the upper surface) of the first magnetic shielding plate 10A, and the protrusion 120 extends and protrudes at the position on the other side of the first magnetic shielding plate 10A corresponding to the position of the magnet insertion groove 110.

[0043] Specifically, when the upper die 21 presses the first magnetic shielding plate 10A, a magnet insertion groove 110 for inserting a magnet is formed on one side of the first magnetic shielding plate 10A. In this case, the shape and depth of the magnet insertion groove 110 can be adjusted according to the shape and thickness of the magnet. Therefore, the shape and pressing depth of the upper die 21 can be adjusted according to the shape and depth of the magnet insertion groove 110. For example, the shape of the magnet insertion groove 110 can be a polygon such as a quadrilateral or a triangle, or can be a circle or an ellipse, and in this case, it can be a symmetric shape or an asymmetric shape. On the other hand, according to the final design of the shielding magnet, the depth of the magnet insertion groove 110 can be less than or equal to the thickness of the magnet, or can also be greater than the thickness of the magnet.

[0044] However, as Figure 2 shown in part (a) of, the lower die 22 that can be used in the present invention may include a molding groove part 22a formed at a position corresponding to the position of the upper die 21, but is not limited thereto. In this case, the shape of the molding groove part 22a corresponds to the shape of the upper die, and the depth d2 of the molding groove part 22a can be greater than or equal to the depth d1 of the magnet insertion groove 110.

[0045] Therefore, when the magnet insertion groove 110 is formed by the pressing of the upper die 21, the material at the first magnetic shielding plate part where the magnet insertion groove 110 is formed is deformed due to the pressing pressure and moves into the molding groove part 22a of the lower die. Thus, the protrusion 120 extends and protrudes at the position on the other side (the lower surface) of the first magnetic shielding part 10A corresponding to the position of the magnet insertion groove 110. In this case, the thickness d3 of the protrusion 120 can be the same as the depth d1 of the magnet insertion groove 110. In this way, if the magnet insertion groove 110 is formed on one side, the protrusion 120 is formed on the other side, thereby not only preventing the formation of flash, but also dispersing the stress applied to the first magnetic shielding plate 10A.

[0046] The first magnetic shielding plate 10A that can be used in the present invention is not particularly limited as long as it is a plate-shaped member formed of a substance commonly used in the art to shield magnetic force in the present invention. For example, a magnetic material with a relatively high magnetic permeability. Specifically, it can be a magnetic shielding plate made of the following magnetic materials, that is, a magnetic material with a relatively high magnetic permeability and capable of shielding and reflecting the magnetic lines of force of a magnet. Specifically, the magnetic shielding plate can be a carbon steel plate (e.g., S45C, etc.), a stainless steel sheet (e.g., SUS430, SUS304, etc.), a free-cutting steel plate (e.g., SUM21, SUM22, SUM22L, SUM23, SUM24L, SUM31, SUM41, SUM43, etc.), a cold-rolled carbon steel sheet (SPCC), a hot-rolled carbon steel sheet, a silicon steel sheet, etc., but is not limited thereto.

[0047] The above-mentioned first magnetic shielding plate 10A can be a magnetic shielding plate that has been blanked into a specified shape or has not been blanked.

[0048] As an example, as Figure 2 shown in part (a) of, the first magnetic shielding plate 10A can be a magnetic shielding plate that has not been blanked.

[0049] As another example, as Figure 6 shown, the first magnetic shielding portion 10A can be a blanked magnetic shielding plate. Specifically, in order to form the peripheral shape of the magnetic shielding unit, the first magnetic shielding plate 10A can be formed by piercing an unblanked magnetic shielding plate into a specified shape, and can include a piercing portion 11 and a magnetic shielding unit peripheral shape portion 12. In this case, a plurality of piercing portions 11 can be arranged at intervals from each other. And, a plurality of the above-mentioned magnetic shielding unit peripheral shape portions 12 can also be arranged at intervals from each other, and the piercing portions 11 are located therebetween. As described above, when the first magnetic shielding plate 10A includes the magnetic shielding unit peripheral shape portion 12, the magnet insertion groove 110 is formed in the magnetic shielding unit peripheral shape portion 12.

[0050] The shape of the above-mentioned magnetic shielding unit peripheral shape portion 12 can be adjusted according to the shape of the magnetic shielding unit. The shape of the magnetic shielding unit is not particularly limited. For example, it can be a polygon such as a quadrilateral or a triangle, or it can be a circle, an ellipse, an irregular shape, etc. In this case, it can be a symmetric shape or an asymmetric shape. And, the size of the magnetic shielding unit peripheral shape portion is not particularly limited and can be greater than or equal to the size of the magnetic shielding unit.

[0051] If the thickness of the first magnetic shielding plate is greater than the depth of the magnet insertion groove, there is no particular limitation. Select a first magnetic shielding plate with an appropriate thickness so that the final thickness of the magnetic shielding unit 100 is about 0.5 mm to 5 mm, specifically in the range of about 0.5 mm to 3 mm.

[0052] The pressure forging of the present invention may be cold forging or hot forging. According to an example, the pressure forging in step S100 may be cold forging. In this case, the cold forging temperature may be normal temperature, specifically, in the range of about 15°C to 30°C.

[0053] The second magnetic shielding plate 10B obtained through the above step S100 includes: a magnet insertion groove 110 formed on one surface (upper part); and a protruding portion 120 extending and protruding at a position on the other surface corresponding to the position of the magnet insertion groove 110. According to an example, the second magnetic shielding plate 10B includes the magnet insertion groove 110 and the protruding portion 120, and the depth d1 of the magnet insertion groove 110 may be the same as the thickness d3 of the protruding portion 120.

[0054] Step S200: Blanking step

[0055] Next, as Figure 3 shown, the second magnetic shielding plate 10B obtained through the above step S100 is blanked to form a spare magnetic shielding unit.

[0056] In step S200, a portion of a specified shape cut from the second magnetic shielding plate 10B is used as the spare magnetic shielding unit 10C. However, during the above cutting process, it can be adjusted so that the portion cut and separated from the second magnetic shielding plate 10B includes the magnet insertion groove 110. Thus, the spare magnetic shielding unit 10C formed through step S200 includes: a main body portion 130A having a magnet insertion groove 110 formed on one surface; and a protruding portion 120 extending and protruding from a part of the other surface of the main body portion 130A.

[0057] In this case, as described in step S100, the shape and depth of the magnet insertion groove 110 should be adjusted according to the shape and thickness of the magnet. And the outline dimensions (lateral length, longitudinal length, and thickness) of the outer periphery of the main body portion 130A are adjusted according to the size and magnetic force of the magnet, so as to block the magnetic force of the magnet. And the shape of the main body portion 130A is not particularly limited. For example, it can be a polygon such as a quadrilateral or a triangle, or it can be a circle, an ellipse, an irregular shape, etc. In this case, it can be a symmetric shape or an asymmetric shape. And as described in step S100, the protruding portion 120 is formed at a position corresponding to the position of the magnet insertion groove 110 and has a shape corresponding to the shape of the magnet insertion groove 110.

[0058] The cutting device that can be used in the present invention is not particularly limited, as long as it is a cutting device commonly used in the field to which the present invention belongs for cutting workpieces (especially metal workpieces), for example, a laser cutting machine, a drilling machine, a wire cutting machine, a water cutting machine, a plasma cutting machine, etc., but is not limited thereto.

[0059] The spare magnetic shielding unit 10C formed through the above step S200 includes: a main body portion 130A, with a magnet insertion groove 110 formed on one surface; and a protruding portion 120, which extends and protrudes from a part of the other surface of the main body portion 130A. In this case, as described in step S100, the protruding portion 120 is formed at a position corresponding to the position of the magnet insertion groove 110 and has a shape corresponding to the shape of the magnet insertion groove 110.

[0060] Step S300: Cutting step

[0061] Subsequently, the protruding portion 120 of the spare magnetic shielding unit 10C obtained through the above step S200 and a part of the other side of the main body portion 130A are cut to form the magnetic shielding unit 100 (refer to Figure 4 ). In this case, there is no chronological relationship between step S200 and step S300. Before performing step S200, the above step S200 can be performed after cutting the protruding portion 120 and a part of the lower portion of the second magnetic shielding plate 10B.

[0062] As Figure 4 shown, the cutting of the lower surface of the spare magnetic shielding unit 10C can be performed using the cutting device 30. In addition to the protruding portion 120 of the spare magnetic shielding unit 10C, a part of the lower side of the main body portion 130A can also be removed. Thus, the magnetic shielding unit 100 of the present invention can not only minimize the thickness deviation of the other side (lower part) of the main body portion 140, but also prevent floating in the vacuum fixture and the magnetic fixture when assembled with the magnet to achieve stable installation.

[0063] However, in the present invention, the lower thickness of the main body portion 140 of the magnetic shielding unit 100 varies with the magnetic force of the magnet to be shielded. Therefore, the cutting thickness of the lower portion of the main body portion 130A should be considered in view of the lower thickness of the main body portion 140 remaining after cutting the protruding portion. Thus, the cutting thickness of the main body portion 130A is not particularly limited. For example, it may be in the range of about 0 mm to 0.1 mm, specifically, it may be in the range of about 0 mm to 0.05 mm, and more specifically, it may be in the range of about 0.01 mm to 0.03 mm.

[0064] In the present invention, for example, milling machining methods, grinding machining methods, etc. can be used as the cutting machining methods that can be used, but it is not limited thereto.

[0065] The cutting device that can be used in the present invention is not particularly limited as long as it is a cutting device commonly used in the field to which the present invention pertains for cutting workpieces (especially metal workpieces). For example, a computer numerical control milling machine (CNC MILLING), a carving machine, a surface grinder, a machining center tooling system (MCT), etc.

[0066] The magnetic shielding unit 100 formed through the above step S300 includes: a main body portion 140; and a magnet insertion groove 110 formed on one surface of the main body portion 140 (refer to Figure 4 part (c)). Different from the prior art, the magnetic shielding unit 100 of the present invention is an integral type rather than an assembled type. That is, the existing magnetic shielding unit has an assembled structure in which an annular upper shielding portion is attached to a plate-shaped lower shielding portion and a magnet is inserted into the ring. In contrast, the magnetic shielding unit 100 of the present invention has an integral structure composed of a single main body portion 140, without being separated into an upper portion and a lower portion. The magnet insertion groove 110 for inserting a magnet is formed in the main body portion 140 itself. In this way, since the magnetic shielding unit 100 of the present invention is different from the existing method and has an integral structure, there is no need to perform the process of assembling the upper shielding portion and the lower shielding portion using a heat-melt double-sided tape. Therefore, the present invention can prevent defects such as separation or misalignment between the upper shielding portion and the lower shielding portion. Moreover, compared with the existing method using a heat-melt double-sided tape, the present invention can not only reduce the manufacturing cost but also reduce the equipment investment or maintenance cost of a heat-melt welding machine or a welding jig, etc. In addition, the shielding magnet manufactured by the present invention can also perform reliability evaluation under harsh conditions such as salt spray, high temperature and high humidity, and thermal shock. Thus, the magnetic shielding unit 100 of the present invention can not only minimize the thickness deviation of the lower portion, but also prevent floating in a vacuum jig and a magnetic jig when assembled with a magnet to achieve stable installation.

[0067] On the other hand, in the method for manufacturing the shielding magnet of the present invention, after the above-mentioned cutting, it may further include: grinding the magnetic shielding unit 100 formed through the above step S300.

[0068] According to an example, the above grinding method may be barrel finishing. In this case, the magnetic shielding unit 100 can be made to move frictionally together with grindstones, water, and compounds to remove burrs remaining on the edge of the magnetic shielding unit 100 and improve the surface roughness of the magnetic shielding unit 100, and contaminants on the surface or corners of the magnetic shielding unit 100 can be removed.

[0069] In the present invention, the grinding device that can be used is not particularly limited, as long as it is a grinding device commonly used in the field of the present invention for polishing the metal surface, for example, a barrel grinding machine, etc.

[0070] Step S400: Magnet insertion step

[0071] Then, insert the magnet 200 into the magnet insertion groove 110 of the magnetic shielding unit 100 obtained through the above step S300 to form the shielding magnet 1000 (refer to Figure 9 ). In this case, there is no temporal sequence relationship between step S300 and step S400. Before performing step S300, the above step S300 can be performed after inserting the magnet 200 into the magnet insertion groove 110 of the spare magnetic shielding unit 10C.

[0072] The magnet that can be used in the present invention can be a permanent magnet or a ferromagnetic body without magnetic force. In this case, the permanent magnet can be a monopole magnet or a multipole magnet formed with N poles and S poles of two or more poles through multipole magnetization. On the other hand, when the above magnet is a ferromagnetic body, after performing step S400, a magnetization process for imparting magnetic force needs to be performed. However, in the present invention, since each step of manufacturing the shielding magnet is not performed under high-temperature conditions, the magnetic force of the magnet will not decrease. Therefore, different from the existing method, even if the present invention uses a magnet with magnetic force, no additional magnetization process is required.

[0073] When the above magnet 200 is inserted into the magnet insertion groove 110, double-sided tape or an adhesive can be used to fix it inside the magnet insertion groove 110. Thereby, the magnet 200 can be prevented from detaching from the magnet insertion groove 110.

[0074] On the other hand, in the method for manufacturing the shielding magnet of the present invention, before performing the above step S400, it may further include a step of plating the magnetic shielding unit 100 obtained through the above step S300. Therefore, the magnetic shielding unit 100 may further include a plating layer (not shown) formed on the surface of the above magnetic shielding unit 100.

[0075] The plating method that can be used in the present invention is not particularly limited as long as it is a method commonly used in the field of the present invention for coating a (semi) metal on a metal surface. For example, methods such as electrolytic plating, electroless plating, hot dip plating, vapor deposition plating, spray plating, etc.

[0076] According to one example, the present invention can form a plating layer on the surface of the magnetic shielding unit 100 by subjecting the magnetic shielding unit 100 to electrolytic plating or electroless plating of a (semi) metal or alloy.

[0077] During the above plating process, the plating conditions such as the temperature of the plating solution, the plating time, the metal concentration in the plating solution, the applied current density, etc. are not particularly limited and can be adjusted based on the type and thickness of the plating layer.

[0078] The components of the above plating layer are zinc, nickel, copper, etc., but are not limited thereto. The above components can be used alone, or two or more of them can be used in combination.

[0079] The thickness of such a plating layer is not limited. For example, it can be 10 μm or more, specifically, it can be in the range of about 12 μm to 100 μm, and more specifically, it can be in the range of about 12 μm to 50 μm.

[0080] The above plating layer can be a single layer or a composite layer. According to one example, the plating layer can be a nickel layer. In this case, the nickel layer can be formed by electroless plating or electrolytic plating. According to another example, the plating layer can include: a copper layer; and a nickel layer laminated above the copper layer. In this case, the thicknesses of the copper layer and the nickel layer are not particularly limited. For example, the thickness of the copper layer can be about 5 μm or more, specifically, it can be in the range of about 5 μm to 40 μm, and more specifically, it can be in the range of about 5 μm to 20 μm, and the thickness of the nickel layer can be about 5 μm or more, specifically, it can be in the range of about 7 μm to 60 μm, and more specifically, it can be in the range of about 7 μm to 30 μm.

[0081] Figure 5 To briefly show the flowchart of the method for manufacturing the shielding magnet according to the second embodiment of the present invention, Figures 6 to 8A cross-sectional view for briefly showing each process of manufacturing a shielding magnet according to a second embodiment of the present invention. According to a first embodiment of the present invention, a method for manufacturing a shielding magnet includes: Step S10 of forming a first magnetic shielding plate by perforating a magnetic shielding plate, the first magnetic shielding plate including a perforated portion and a magnetic shielding peripheral shape portion; Step S20 of forming a spare magnetic shielding unit by pressure forging the magnetic shielding unit peripheral shape portion, the spare magnetic shielding unit having a magnet insertion groove formed on one side; Step S30 of forming a magnetic shielding unit by cutting the edge of the spare magnetic shielding unit; and Step S40 of inserting a magnet into the magnet insertion groove of the magnetic shielding unit. However, optionally, after the cutting, the method for manufacturing a shielding magnet according to an example of the present invention may further include: grinding the magnetic shielding unit formed through Step S30; and / or before inserting the magnet, it may further include: plating the magnetic shielding unit. However, it is not limited thereto, and the above steps do not need to be executed in sequence, and the steps of each process may be changed according to design specifications, or may be selectively mixed and executed. In particular, there is no chronological order between Step S30 and Step S40.

[0082] Hereinafter, with reference to Figures 5 to 8 , each process of manufacturing a shielding magnet according to a second embodiment of the present invention will be described.

[0083] Step S10: Punching step

[0084] First, a first magnetic shielding plate 10A is formed by perforating a magnetic shielding plate (not shown).

[0085] As Figure 6 shown, in Step S10, in order to form the peripheral shape of the magnetic shielding unit, a first magnetic shielding plate 10A is formed by perforating the magnetic shielding portion. The first magnetic shielding plate 10A includes: a perforated portion 11 and a magnetic shielding unit peripheral shape portion 12.

[0086] In this case, a plurality of perforated portions 11 may be arranged at intervals from each other. And a plurality of the magnetic shielding unit peripheral shape portions 12 may also be arranged at intervals from each other, and the perforated portions 11 are located therebetween.

[0087] The shape of the magnetic shielding unit peripheral shape portion 12 can be adjusted according to the shape of the magnetic shielding unit. The shape of the magnetic shielding unit is not particularly limited. For example, it can be a polygon such as a quadrilateral or a triangle, or it can be a circle, an ellipse, an irregular shape, etc. In this case, it can be a symmetric shape or an asymmetric shape.

[0088] And the size of the magnetic shielding unit peripheral shape portion is not particularly limited and can be greater than or equal to the size of the magnetic shielding unit.

[0089] The magnetic shielding plate that can be used in the present invention is not particularly limited as long as it is a plate-shaped member that is not blanked and is formed of a material commonly used in the field of the present invention for shielding magnetic force. For example, a magnetic material with a relatively high magnetic permeability. Specifically, it can be a magnetic shielding plate made of the following magnetic material, that is, a magnetic material with a relatively high magnetic permeability and capable of shielding and reflecting the magnetic lines of force of a magnet. Among them, since the examples of the magnetic shielding plate are the same as those described in step S100 of the first embodiment, the detailed description will be omitted.

[0090] If the thickness of the magnetic shielding plate is greater than the depth of the magnet insertion groove, there is no particular limitation. For example, a first magnetic shielding plate with a suitable thickness is selected so that the final thickness of the magnetic shielding unit is about 0.5 mm to 5 mm, specifically in the range of about 0.5 mm to 3 mm.

[0091] In the present invention, the punching device that can be used is not particularly limited as long as it is a punching device commonly used in the field of the present invention for punching workpieces (especially metal workpieces), such as a laser cutting machine, a punching machine (e.g., a die punching machine, a rotary punching machine), etc., but is not limited thereto.

[0092] Step S20: Pressure forging step

[0093] Next, the peripheral shape portion 12 of the magnetic shielding unit of the first magnetic shielding plate 10A formed through the above step S10 (hereinafter referred to as the "peripheral shape portion") is subjected to press forging.

[0094] As Figure 7 shown, after the first magnetic shielding portion 10A is placed between the upper die 21 and the lower die 22, if the upper die 21 is vertically moved toward the first magnetic shielding plate 10A side (the upper die 21 is lowered) to press the peripheral shape portion 12 of the magnetic shielding unit, a magnet insertion groove 110 with a specified depth is formed on the surface (e.g., the upper part) of the peripheral shape portion 12 of the magnetic shielding unit.

[0095] Specifically, if the upper die 21 presses the peripheral shape portion 12 of the magnetic shielding unit, a magnet insertion groove 110 for inserting a magnet is formed on one surface of the peripheral shape portion 12 of the magnetic shielding unit.

[0096] In this case, the shape and depth of the magnet insertion groove 110 can be adjusted according to the shape and thickness of the magnet. For example, the shape of the magnet insertion groove 110 can be a polygon such as a quadrilateral or a triangle, or can be a circle or an ellipse. In this case, it can be a symmetric shape or an asymmetric shape. On the other hand, according to the final design of the shielding magnet, the depth of the magnet insertion groove 110 can be less than or equal to the thickness of the magnet, or can also be greater than the thickness of the magnet.

[0097] However, different from the lower die 22 used in the first embodiment, the lower die 22 used in the second embodiment does not include the molding groove portion 22a. Therefore, the mold manufacturing cost can be reduced.

[0098] The pressure forging of the present invention can be cold forging or hot forging. According to an example, the pressure forging in step S20 can be cold forging. In this case, the cold forging temperature can be normal temperature, specifically, in the range of about 15°C to 30°C.

[0099] In the above step S20, the obtained spare magnetic shielding unit 10D includes a main body portion 130B, and a magnet insertion groove 110 is formed on one side (upper part). Therefore, an irregular-shaped edge is formed on the above-mentioned main body portion 130B.

[0100] Step S30: Removal step

[0101] Subsequently, the magnetic shielding unit 100 is formed by cutting off the edge of the spare magnetic shielding unit 10D formed in the above step S20.

[0102] In the above step S20, when the magnet insertion groove 110 is formed by the pressing of the upper die 21, the material at the peripheral shape portion of the magnet insertion groove 110 forming portion is deformed due to the pressing pressure and moves irregularly toward the side of the peripheral shape portion, thereby flash can be formed. As Figure 8 shown, the irregular edge portion of the spare magnetic shielding unit 10D is removed by the cutting in step S30. Thus, the present invention can manufacture the magnetic shielding unit 100 (refer to Figure 9 ), which includes: a main body portion 140 and a magnet insertion groove 110 formed on one side of the above-mentioned main body portion 140.

[0103] In this case, as described in step S10, the shape and depth of the above-mentioned magnet insertion groove 110 should be adjusted according to the shape and thickness of the magnet. And, the outline dimensions (lateral length, longitudinal length, and thickness) of the peripheral portion of the main body portion 140 are adjusted according to the size and magnetic force of the magnet, so as to block the magnetic force of the magnet. And, the shape of the main body portion 140 is not particularly limited. For example, it can be a polygon such as a quadrilateral or a triangle, or it can be a circle, an ellipse, an irregular shape, etc. In this case, it can be a symmetric shape or an asymmetric shape.

[0104] In the present invention, the cutting device that can be used is not particularly limited, as long as it is a cutting device commonly used in the field to which the present invention belongs for cutting workpieces (especially metal workpieces), for example, a laser cutting machine, a punching machine, a wire cutting machine, a water cutting machine, a plasma cutting machine, etc., but is not limited thereto.

[0105] On the other hand, in the method for manufacturing a shielding magnet of the present invention, after the above-mentioned cutting, it may further include: grinding the magnetic shielding unit 100 formed through the above step S30. Among them, the description of the above grinding is the same as that described for the grinding in the first embodiment, and therefore, the detailed description will be omitted.

[0106] Step S40: Magnet insertion step

[0107] Then, a magnet 200 is inserted into the magnet insertion groove 110 of the magnetic shielding unit 100 obtained through the above step S30 to form a shielding magnet 1000 (refer to Figure 9 ). In this case, there is no chronological relationship between step S30 and step S40. Before performing step S30, the above step S30 can be performed after inserting the magnet 200 into the magnet insertion groove 110 of the spare magnetic shielding unit 10D.

[0108] The types of magnets and the insertion methods that can be used in the present invention are the same as those described in step S400 of the first embodiment, and therefore, the detailed description will be omitted.

[0109] On the other hand, in the method for manufacturing a shielding magnet of the present invention, before performing the above step S40, it may further include a step of plating the magnetic shielding unit 100 obtained through the above step S30. Therefore, the magnetic shielding unit 100 may further include a plating layer (not shown), which is formed on the surface of the above magnetic shielding unit 100.

[0110] The plating methods and plating materials that can be used in the present invention are the same as those described in step S400 of the first embodiment, and therefore, the detailed description will be omitted.

[0111] On the other hand, the present invention provides a shielding magnet manufactured by the above manufacturing method.

[0112] As Figure 9As shown, the shielding magnet 1000 of the present invention includes: a magnet 200; and a magnetic shielding unit 100 including a magnet insertion groove 110 for inserting the above-mentioned magnet. In this case, the magnetic shielding unit 100 includes: a main body portion 140; and a magnet insertion groove 110 formed on one surface of the main body portion 140. The lower part of the main body portion 140 of such a magnetic shielding unit 100 can minimize the thickness deviation. Also, a plating layer (not shown) can be formed on the surface of the magnetic shielding unit 100.

[0113] When manufacturing such a shielding magnet 1000 of the present invention according to the required magnetic force and shape, the length, width, thickness, and shape of the magnetic shielding unit can be easily adjusted. In particular, the bottom thickness of the magnetic shielding unit can be easily adjusted by the magnetic force of the magnet. Therefore, it has the desired magnetic force (adhesion force and shielding force) and shape, thereby increasing the working functionality of mobile devices, protective cases, etc. and the convenience of users.

Claims

1. A manufacturing method of a shielding magnet, characterized in that, It includes the following steps: Form a second magnetic shielding plate by press forging a first magnetic shielding plate made of a magnetic material with a relatively high magnetic permeability. The second magnetic shielding plate includes a magnet insertion groove and a protrusion. The magnet insertion groove is formed on one side, and the protrusion extends and protrudes at a position on the other side corresponding to the position of the magnet insertion groove; Form a spare magnetic shielding unit by blanking the second magnetic shielding plate into a specified shape. The spare magnetic shielding unit includes a body portion and a protrusion. The body portion is formed with a magnet insertion groove on one side, and the protrusion extends and protrudes from a part of the other side of the body portion; Form a magnetic shielding unit by cutting a part of the protrusion and the other side of the body portion of the spare magnetic shielding unit; and Insert a magnet into the magnet insertion groove of the magnetic shielding unit, The magnetic material with a relatively high magnetic permeability is a steel plate.

2. The method for manufacturing a shielding magnet according to claim 1, wherein The press forging is cold press forging.

3. The method for manufacturing a shielding magnet according to claim 1, wherein The first magnetic shielding plate is a magnetic shielding plate including a perforated portion and a peripheral shape portion of the magnetic shielding unit, The magnet insertion groove is formed in the peripheral shape portion of the magnetic shielding unit.

4. The method for manufacturing a shielding magnet according to claim 1, wherein The thickness of the protrusion is the same as the depth of the magnet insertion groove.

5. The method for manufacturing a shielding magnet according to claim 1, wherein The cutting thickness of the body portion is in the range of 0 mm to 0.1 mm.

6. The method for manufacturing a shielding magnet according to claim 1, wherein After the cutting, it further includes: grinding the magnetic shielding unit.

7. The method for manufacturing a shielding magnet according to claim 1, wherein Before inserting the magnet, it further includes: plating the magnetic shielding unit.

8. A method for manufacturing a shielded magnet, characterized in that, It includes the following steps: Form a first magnetic shielding plate by perforating a magnetic shielding plate. The first magnetic shielding plate includes a perforated portion and a peripheral shape portion of the magnetic shielding unit; Form a spare magnetic shielding unit by press forging the peripheral shape portion of the magnetic shielding unit. The spare magnetic shielding unit is formed with a magnet insertion groove on one side; Form a magnetic shielding unit by cutting off the edge of the spare magnetic shielding unit; and Insert a magnet into the magnet insertion groove of the magnetic shielding unit.

9. The method for manufacturing a shielding magnet according to claim 8, wherein The press forging is cold press forging.

10. The method for manufacturing a shielding magnet according to claim 8, wherein After the cutting, it further includes: grinding the magnetic shielding unit.

11. The method for manufacturing a shielding magnet according to claim 8, wherein Before inserting the magnet, it further includes: plating the magnetic shielding unit.

12. A shielding magnet, manufactured based on the method according to any one of claims 1 to 11, characterized in that, It includes: A magnet; And A magnetic shielding unit, formed with a magnet insertion groove for inserting the magnet.

13. The shielding magnet according to claim 12, wherein The magnetic shielding unit further includes a plating layer formed on the surface of the magnetic shielding unit.

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