Electromagnetic shielding piece
By setting grooves and through holes on the metal parts and injection molding to form the embedded parts and snap-fit parts, the problem of delamination and cracking between the metal plate and the plastic plate is solved, and high-strength and low-cost production of electromagnetic shielding parts is achieved.
Patent Information
- Application Number
- CN202423260597.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-27
- Publication Date
- 2026-01-20
- Estimated Expiration
- 2034-12-27
AI Technical Summary
In existing electromagnetic shielding components, metal plates and plastic plates are prone to delamination and cracking due to their different coefficients of thermal expansion, and the manufacturing process is complex and costly.
The metal parts are designed with grooves and through holes, and the plastic parts are formed by injection molding to create the insert and snap-fit parts, so that the metal parts and plastic parts are tightly connected. The groove and arc transition structure is used to improve the connection strength.
It improves the mechanical strength and structural stability of electromagnetic shielding components, reduces production costs and weight, and avoids delamination and cracking caused by differences in thermal expansion coefficients.
Smart Images
Figure CN223816347U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to the technical field of electromagnetic shielding, particularly to an electromagnetic shielding piece. BACKGROUND
[0002] With the continuous development of electrical and electronic technology, whether in industry or in people's daily life, electronic equipment has become an indispensable tool. When the electronic equipment works, the electronic components will generate electromagnetic waves, which not only causes electromagnetic interference between the electronic components inside the electronic equipment, affecting the normal work of the electronic equipment, but also causes adverse effects on the human body. In order to ensure electromagnetic compatibility, electromagnetic shielding elements are usually provided on electronic equipment.
[0003] In the prior art, the electromagnetic shielding upper cover is usually made of aluminum die-casting metal parts, which has high cost and heavy weight. In order to reduce the cost and weight, another scheme is to use a plastic injection-molded upper cover, and the electromagnetic shielding plate is installed by welding or screws. This scheme has complex manufacturing process and high cost, and it is necessary to add sound-absorbing cotton structure between the shielding plate and the plastic part, which has high manufacturing difficulty and cost. Another scheme is to use an insert injection molding method to directly injection mold a plastic plate on one side of the metal plate. However, due to the difference in thermal expansion coefficient between plastic and metal, the metal plate and the plastic plate are prone to delamination and cracking after cold and hot impact. SUMMARY
[0004] The utility model aims to provide an electromagnetic shielding piece to solve the problem of delamination and cracking of the metal plate and the plastic plate of the injection-molded metal part in the prior art.
[0005] A further object of the utility model is to facilitate the production and manufacture of the electromagnetic shielding piece.
[0006] According to the purpose of the utility model, the utility model provides an electromagnetic shielding piece, which comprises:
[0007] A metal part has opposite first and second sides, and at least one groove is provided on the first side. At least one through hole is provided at each groove.
[0008] A plastic part is injection molded based on the metal part, and comprises a panel portion, an embedded portion and a buckle portion connected in sequence. The panel portion is attached to the second side of the metal part, the embedded portion is arranged at the through hole, and the buckle portion is arranged at the groove, so that the metal part and the plastic part are connected to each other.
[0009] Optionally, the size of the opening of each groove is smaller than the size of the groove bottom.
[0010] Optionally, the size of each groove gradually increases in the direction from the opening to the groove bottom.
[0011] Optionally, each groove is punched by the metal piece towards the direction of the second side face, the side wall and the bottom wall of the groove are transitioned by a circular arc and form a first circular arc, the metal piece adjacent to the opening of the side wall is transitioned by a circular arc and forms a second circular arc.
[0012] Optionally, the included angle between the side wall and the first direction is any value in the range of 3-15°; wherein the first direction is perpendicular to the extension direction of the metal piece.
[0013] Optionally, the radius of curvature of the first circular arc is any value in the range of 1-10mm; the radius of curvature of the second circular arc is any value in the range of 1-10mm.
[0014] Optionally, the diameter of each through hole is any value in the range of 3-7mm.
[0015] Optionally, the number of grooves is multiple, and multiple grooves are uniformly distributed on the metal piece, so that the connection between the metal piece and the plastic piece is tight.
[0016] Optionally, the plastic piece is provided with a reinforcing rib extending away from the metal piece.
[0017] Optionally, the peripheral side of the electromagnetic shielding piece is provided with an assembly part, and the assembly part is provided with a plurality of assembly holes.
[0018] In the utility model, the electromagnetic shielding piece includes a metal piece and a plastic piece. The metal piece has opposite first and second side faces, and at least one groove is arranged on the first side face. At least one through hole is arranged at each groove. The plastic piece is injection molded based on the metal piece to form a face plate part, an embedded part and a buckle part connected in sequence. The face plate part is attached to the second side face of the metal piece. The embedded part is arranged at the through hole. The buckle part is arranged at the groove, so that the metal piece and the plastic piece are connected to each other. Compared with the prior art of injection molding of the metal electromagnetic shielding piece, the plastic can flow to the other side of the face plate part through the through hole, so that the metal piece is prevented from being deformed due to excessive pressure in the injection molding process. After the plastic flows through the through hole, the buckle part is formed at the groove of the metal piece. Thus, the metal piece and the plastic piece are clamped together through the embedded part and the buckle part, the connection strength of the metal piece and the plastic piece is improved, and the metal piece and the plastic piece will not be delaminated and cracked due to the different expansion coefficients of the metal and the plastic after cold and hot impact, so that the mechanical strength and the mode of the electromagnetic shielding piece are improved.
[0019] Further, the recess of the metal piece is protruded from the second side face, and the depth of the recess is greater than the distance from the first side face to the second side face. In this way, the first arc and the second arc of the recess are beneficial to improve the adhesion of the plastic piece and the metal piece, and are beneficial to fill the recess and the gap outside the recess with plastic during injection molding, so that the structural stability of the electromagnetic shielding piece can be improved, and the production and manufacturing of the electromagnetic shielding piece are facilitated.
[0020] The above and other objects, advantages and features of the present application will become more apparent from the following detailed description of the embodiments of the present application taken in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF DRAWINGS
[0021] Some specific embodiments of the present application will be described in detail below with reference to the accompanying drawings, which are presented by way of illustration and not of limitation. Like reference numerals designate like or similar parts or portions throughout the drawings. It should be understood by those skilled in the art that the drawings are not necessarily drawn to scale. In the drawings:
[0022] Figure 1 is a schematic exploded view of an electromagnetic shielding piece according to one specific embodiment of the present application;
[0023] Figure 2 is a schematic structural view of an electromagnetic shielding piece according to one specific embodiment of the present application;
[0024] Figure 3 is a schematic structural view of a through hole according to one specific embodiment of the present application;
[0025] Figure 4 is Figure 3 is a schematic partial sectional view along A-A direction.
[0026] BRIEF DESCRIPTION OF DRAWINGS
[0027] 100 - electromagnetic shielding piece, 10 - metal piece, 11 - first side face, 12 - second side face, 13 - recess, 131 - side wall, 132 - bottom wall, 133 - first arc, 134 - second arc, 14 - through hole, 20 - plastic piece, 21 - panel portion, 22 - embedded portion, 23 - buckle portion, 24 - reinforcing rib, 30 - assembly portion, 31 - assembly hole. DETAILED DESCRIPTION
[0028] In the description of the present embodiment, it should be understood that the terms "upper", "lower", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present utility model.
[0029] Figure 1 is a schematic exploded view of an electromagnetic shield 100 according to one specific embodiment of the present utility model, Figure 2 is a schematic structural view of an electromagnetic shield 100 according to one specific embodiment of the present utility model, Figure 3 is a schematic structural view of a through hole 14 according to one specific embodiment of the present utility model, Figure 4 is Figure 3 a schematic partial sectional view along A-A. Among them, Figure 4 The middle angle a is the included angle between the side wall 131 and the first direction.
[0030] As shown in Figures 1-4 , as one specific embodiment of the present utility model, the electromagnetic shield 100 includes a metal piece 10 and a plastic piece 20. Among them, the metal piece 10 has opposite first and second side surfaces 11 and 12, at least one groove 13 is provided on the first side surface 11, and at least one through hole 14 is provided at each groove 13. The plastic piece 20 is injection molded based on the metal piece 10 to form, and the plastic piece 20 includes a panel portion 21, an embedded portion 22 and a buckle portion 23 connected in sequence, the panel portion 21 is attached to the second side surface 12 of the metal piece 10, the embedded portion 22 is provided at the through hole 14, and the buckle portion 23 is provided at the groove 13, so that the metal piece 10 and the plastic piece 20 are connected to each other.
[0031] Specifically, at least one groove 13 is provided on the first side surface 11 of the metal piece 10 before injection molding based on the metal piece 10, and at least one through hole 14 is provided at each groove 13. When injection molding, the metal piece 10 is placed on the upper side of the mold, the first side surface 11 faces upward, and the injection port of the mold is located below the metal piece 10. The plastic enters from the injection port, gradually fills the panel portion 21 on the second side surface 12 of the metal piece 10, and continues to inject plastic, which will flow from the through hole 14 of the metal piece 10 to the groove 13 on the first side surface 11. In this way, the plastic forms the embedded portion 22 at the through hole 14 and the buckle portion 23 at the groove 13.
[0032] The metal piece 10 and the plastic piece 20 in the electromagnetic shielding piece 100 are connected through the embedding part 22 and the buckle part 23, the connection strength of the metal piece 10 and the plastic piece 20 can be strengthened, and the metal piece 10 and the plastic piece 20 can be prevented from being delaminated and cracked after cold and hot impact due to different expansion coefficients of the metal and the plastic.
[0033] Compared with the existing aluminum die-casting metal electromagnetic shielding piece 100, the metal piece 10 and the plastic piece 20 in the electromagnetic shielding piece 100 are integrally formed through injection molding, the weight of the electromagnetic shielding piece 100 can be reduced, and the production manufacturing cost can be reduced.
[0034] Compared with the existing injection molding metal electromagnetic shielding piece 100, the plastic can flow to the other side of the panel part 21 through the through hole 14, the metal piece 10 can be prevented from being deformed due to excessive pressure in the injection molding process, and the buckle part 23 is formed at the groove 13 of the metal piece 10 after the plastic flows through the through hole 14, so that the metal piece 10 and the plastic piece 20 are connected through the embedding part 22 and the buckle part 23, the connection strength of the metal piece 10 and the plastic piece 20 can be improved, and the metal piece 10 and the plastic piece 20 will not be delaminated and cracked due to different expansion coefficients of the metal and the plastic after cold and hot impact, and the mechanical strength and the mode of the electromagnetic shielding piece 100 can be improved.
[0035] In some embodiments, the size of the opening of each groove 13 can be less than the size of the groove bottom. In this way, the size of the part of the buckle part 23 located at the opening of the groove 13 is less than the size of the part at the bottom of the groove 13, and the groove bottom can limit the movement of the buckle part 23 towards the second side 12 when the injection molding of the plastic piece 20 is completed or when the plastic piece 20 is subjected to cold and hot impact, so that the buckle part 23 will not be separated from the groove 13, the plastic piece 20 can be prevented from being separated from the metal piece 10, and the connection strength of the plastic piece 20 and the metal piece 10 can be improved.
[0036] In some embodiments, the size of the opening of each groove 13 can be less than the size of the groove bottom. In this way, the size of the part of the buckle part 23 located at the opening of the groove 13 is less than the size of the part at the bottom of the groove 13, and the groove bottom can limit the movement of the buckle part 23 towards the second side 12 when the injection molding of the plastic piece 20 is completed or when the plastic piece 20 is subjected to cold and hot impact, so that the buckle part 23 will not be separated from the groove 13, the plastic piece 20 can be prevented from being separated from the metal piece 10, and the connection strength of the plastic piece 20 and the metal piece 10 can be improved.
[0037] In some embodiments, the size of each groove 13 can gradually increase in the direction from the opening to the bottom of the groove. In this way, the size of the portion of the clasp 23 located at the opening of the groove 13 gradually decreases than the size of the portion at the bottom of the groove 13, which can effectively prevent the clasp 23 from being separated from the groove 13, and can improve the connection strength of the plastic part 20 and the metal part 10, thereby improving the structural stability of the electromagnetic shielding part 100. In other embodiments, the shape of the side wall 131 of the groove 13 can be set according to actual needs, for example, the side wall 131 is set to be wavy.
[0038] In some embodiments, each groove 13 can be punched by the metal part 10 towards the second side 12, the side wall 131 of the groove 13 and the bottom wall 132 are transitioned with a circular arc and form a first circular arc 133, and the metal part 10 adjacent to the opening of the side wall 131 is transitioned with a circular arc and forms a second circular arc 134. It can be understood that the groove 13 of the metal part 10 protrudes from the second side 12, and the depth of the groove 13 is greater than the distance from the first side 11 to the second side 12. The first circular arc 133 and the second circular arc 134 of the groove 13 in this embodiment are beneficial to improve the fit of the plastic part 20 and the metal part 10, and are beneficial to fill the gap outside the groove 13 with plastic during injection molding, thereby improving the structural stability of the electromagnetic shielding part 100, and facilitating the production and manufacturing of the electromagnetic shielding part 100.
[0039] In other embodiments, when the metal part 10 has a certain thickness, each groove 13 can be directly provided on the first side 11 of the metal part 10, and at this time, the depth of the groove 13 is less than the distance from the first side 11 to the second side 12.
[0040] In some embodiments, the angle a between the side wall 131 and the first direction can be any value within the range of 3-15°, for example, 3°, 5°, 10°, 12°, or 15°. In this embodiment, the angle between the extension direction of the side wall 131 and the first direction is 10°. The first direction is perpendicular to the extension direction of the metal part 10.
[0041] Here, the size of the groove 13 gradually increases in the direction from the opening to the bottom of the groove, and the side wall 131 gradually moves away from the center of the groove 13 in the direction from the first side 11 to the second side 12. In this way, the groove 13 and the clasp 23 form a negative angle with the vertical direction, which can prevent the plastic part 20 and the metal part 10 from cracking after high-low temperature cold and hot cycles due to the inconsistent expansion coefficients of the materials of the plastic part 20 and the metal part 10. Figure 4
[0042] In some embodiments, the radius of curvature of the first circular arc 133 can be any value in the range of 1-10 mm, for example, 1 mm, 3 mm, 5 mm, 7 mm, or 10 mm. In this embodiment, the radius of curvature of the first circular arc 133 is 3 mm.
[0043] In some embodiments, the radius of curvature of the second circular arc 134 can be any value in the range of 1-10 mm, for example, 1 mm, 3 mm, 5 mm, 7 mm, or 10 mm. In this embodiment, the radius of curvature of the second circular arc 134 is 4 mm.
[0044] In some embodiments, the diameter of each through hole 14 can be any value in the range of 3-7 mm, for example, 3 mm, 3.5 mm, 5 mm, 6 mm, or 7 mm. In this embodiment, the diameter of the through hole 14 is 3.5 mm. In other embodiments, the size of the through hole 14 can be selected according to the frequency band of electromagnetic shielding.
[0045] In some embodiments, the number of grooves 13 can be multiple, and the multiple grooves 13 are uniformly distributed on the metal piece 10 to make the connection between the metal piece 10 and the plastic piece 20 tight. In this embodiment, referring to Figure 1 , the number of grooves 13 is 19, of which 6 grooves 13 are uniformly distributed in one direction and 13 grooves 13 are uniformly distributed in the other direction. The part of the metal piece 10 and the plastic piece 20 can be clamped on the electromagnetic shielding piece 100, which can improve the connection strength of the metal piece 10 and the plastic piece 20, so that the metal piece 10 and the plastic piece 20 are tightly connected together. In other embodiments, the number of grooves 13 can be set according to actual needs.
[0046] In some embodiments, the plastic piece 20 can be provided with a reinforcing rib 24 extending away from the metal piece 10. Here, the reinforcing rib 24 is perpendicular to the extension plane of the metal piece 10 and the plastic piece 20, which can enhance the rigidity and strength of the electromagnetic shielding piece 100, effectively reducing the degree of deformation of the electromagnetic shielding piece 100. The reinforcing rib 24 can also achieve the effect of enhancing the strength and rigidity without increasing the thickness of the metal piece 10 or the plastic piece 20, thereby saving the material usage of the electromagnetic shielding piece 100, reducing the weight, and reducing the production cost.
[0047] When assembling the electromagnetic shielding piece 100 with other parts, the reinforcing rib 24 can provide guidance and support, ensuring the accuracy and stability of the assembly. This embodiment can improve the practicability and reliability of the electromagnetic shielding piece 100 by designing and applying the reinforcing rib 24.
[0048] In some embodiments, the circumferential side of the electromagnetic shield 100 can be provided with a mounting portion 30, and a plurality of mounting holes 31 are arranged on the mounting portion 30, and the fasteners are matched with the mounting holes 31, which can improve the connection strength between the metal part 10 and the plastic part 20, and facilitate the assembly of the electromagnetic shield 100 and other parts.
[0049] At this point, those skilled in the art should recognize that, although the present application has been fully illustrated and described herein with a plurality of exemplary embodiments, many other variants or modifications in accordance with the principles of the present application can be directly determined or deduced from the disclosure of the present application without departing from the spirit and scope of the present application. Therefore, the scope of the present application should be understood and recognized as covering all these other variants or modifications.
Claims
1. An electromagnetic shield, characterized in that, The electromagnetic shielding piece comprises: a metal piece having opposite first and second sides, at least one groove being provided on the first side, and at least one through hole being provided at each groove; a plastic piece being injection molded on the basis of the metal piece, the plastic piece comprising a panel portion, an embedding portion and a buckle portion connected in sequence, the panel portion being attached to the second side of the metal piece, the embedding portion being provided at the through hole, and the buckle portion being provided at the groove so as to connect the metal piece and the plastic piece with each other.
2. The electromagnetic shielding piece according to claim 1, wherein the size of the opening of each groove is smaller than the size of the groove bottom.
3. The electromagnetic shielding piece according to claim 2, wherein the size of each groove gradually increases in the direction from the opening to the groove bottom.
4. The electromagnetic shielding piece according to claim 3, wherein each groove is punched by the metal piece towards the direction of the second side, the side wall and the bottom wall of the groove are connected by a circular arc to form a first circular arc, and the metal piece adjacent to the opening of the side wall is connected by a circular arc to form a second circular arc.
5. The electromagnetic shielding piece according to claim 4, wherein the included angle between the side wall and a first direction is any value within the range of 3-15°, wherein the first direction is perpendicular to the extension direction of the metal piece.
6. The electromagnetic shielding piece according to claim 4, wherein the radius of curvature of the first circular arc is any value within the range of 1-10 mm, and the radius of curvature of the second circular arc is any value within the range of 1-10 mm.
7. The electromagnetic shielding piece according to any one of claims 1-6, wherein the diameter of each through hole is any value within the range of 3-7 mm.
8. The electromagnetic shielding piece according to any one of claims 1-6, wherein the number of grooves is multiple, and the multiple grooves are uniformly distributed on the metal piece so as to tightly connect the metal piece and the plastic piece.
9. The electromagnetic shielding piece according to any one of claims 1-6, wherein a reinforcing rib extending away from the metal piece is provided on the plastic piece.
10. The electromagnetic shielding piece according to any one of claims 1-6, wherein a fitting portion is provided on the peripheral side of the electromagnetic shielding piece, and a plurality of fitting holes are provided on the fitting portion.