Metal-plastic connector, middle frame and electronic terminal
By setting up accommodating grooves and nano micropores at the break of the metal part, the contact area between the plastic part and the metal part is increased, and the bonding strength is improved by using the anchoring effect, the problem of low bonding strength between the metal part and the plastic part is solved, and a high-strength and beautiful bonding effect is achieved.
Patent Information
- Application Number
- CN202421625136.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-10
- Publication Date
- 2025-07-25
- Estimated Expiration
- 2034-07-10
AI Technical Summary
The bonding strength between metal parts and plastic parts is low at the joint and is prone to cracking in the post-process.
The first and second receiving grooves are arranged at the fracture of the metal part, and nano micropores are arranged on the groove wall. The plastic part is filled with the fracture, the receiving groove and the micropores, and the bonding area and strength are increased through the anchoring effect.
The bonding strength between metal parts and plastic parts is improved, the chance of cracking at the junction is reduced, and the reliability and aesthetics of the bond are enhanced.
Smart Images
Figure CN223157337U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the technical field of metal-plastic bonding, and particularly relates to a metal-plastic bonded part, a middle frame and an electronic terminal. Background Art
[0002] All electronic products adopt metal casings. Due to the natural property of metal casings and other metal parts to shield signals, in order to achieve signal transmission, it is necessary to partition the metal casings and other metal parts and fill them with plastic. However, the bonding strength at the joint between the metal part and the plastic part is relatively low, so that the joint is prone to cracking in the post-process after the metal part and the plastic part are bonded and formed. Utility Model Content
[0003] In view of the above, it is necessary to provide a metal-plastic bonded part, a middle frame and an electronic terminal to reduce the probability of cracking at the joint between the metal part and the plastic part.
[0004] An embodiment of this application provides a metal-plastic bonded part, including a metal part and a plastic part. The metal part is provided with a fracture. The fracture has a first side wall and a second side wall oppositely arranged along a first direction. A first receiving groove extending along the first direction is provided on the first side wall, and a second receiving groove extending along the first direction is provided on the second side wall. The groove walls of the first receiving groove and the second receiving groove both have a plurality of nano micropores, and the plastic part is filled in the fracture, the first receiving groove, the second receiving groove and each of the nano micropores.
[0005] In the above metal-plastic bonded part, the plastic part is filled in the fracture, the first receiving groove, the second receiving groove and each of the nano micropores to be integrated with the metal part. The contact surface between the plastic part and the metal part includes not only the first side wall and the second side wall, but also the groove walls of the first receiving groove and the second receiving groove, thereby increasing the contact area between the plastic part and the metal part. Since a plurality of nano micropores are provided on the groove walls of the first receiving groove and the second receiving groove, when the plastic part fills the nano micropores to generate an anchor bolt effect, the plastic part generates an anchor bolt effect with the groove walls of the first receiving groove and the second receiving groove, thereby increasing the area where the anchor bolt effect is generated, and further increasing the bonding strength between the metal part and the plastic part, and reducing the probability of cracking at the joint between the metal part and the plastic part.
[0006] In some embodiments, the first receiving groove is a rectangular groove, and the total area of the groove wall of the first receiving groove is greater than or equal to three times the cross-sectional area of the first receiving groove along the first direction.
[0007] In some embodiments, the cross-sectional area of the first receiving groove along the first direction is S1, and S1 satisfies the following relationship:
[0008] S1 = S2 * P2 / P1
[0009] Wherein, S2 is the area of the cross-section of the metal part corresponding to the first receiving groove along the first direction, P1 is the tensile strength of the plastic part, and P2 is the tensile strength of the metal part.
[0010] In some embodiments, the first receiving groove extends along a second direction perpendicular to the first direction to the inner sidewall of the metal part. The two adjacent sides of the bottom of the first receiving groove extend along the second direction and the third direction respectively. The first direction, the second direction, and the third direction are perpendicular to each other in pairs. The length of one side of the bottom of the first receiving groove extending along the third direction is A, the length of one side of the bottom of the first receiving groove extending along the second direction is B, and the depth of the first receiving groove along the first direction is C. C satisfies the following relationship:
[0011] C ≥ 2S1 / (2B + A).
[0012] In some embodiments, the second receiving groove has the same structure as the first receiving groove, and the second receiving groove and the first receiving groove are symmetrically arranged about the fracture.
[0013] In some embodiments, the regions of the first sidewall and the second sidewall where the first receiving groove and the second receiving groove are not opened also have a plurality of the nano micropores.
[0014] In some embodiments, the plastic part is formed by nano-injection molding on the fracture, the first receiving groove, the second receiving groove, and each of the nano micropores.
[0015] In some embodiments, at least one positioning groove and / or at least one positioning protrusion are provided on the groove walls of the first receiving groove and the second receiving groove. The plastic part is filled in the positioning groove and / or coated on the positioning protrusion at the same time. The groove walls of the positioning groove and / or the positioning protrusion also have a plurality of the nano micropores.
[0016] The embodiment of the present application further provides a middle frame, including the above-mentioned metal-plastic combination part.
[0017] The above-mentioned middle frame includes a metal-plastic combination part. The plastic part of the metal-plastic combination part is filled in the fracture, the first receiving groove, the second receiving groove, and each of the nano micropores, so that the contact surface between the plastic part and the metal part includes, in addition to the first sidewall and the second sidewall, the groove walls of the first receiving groove and the second receiving groove, thereby increasing the bonding area between the plastic part and the metal part, further increasing the bonding strength between the metal part and the plastic part, and reducing the probability of cracking at the joint of the metal-plastic combination part of the middle frame.
[0018] An embodiment of the present application further provides an electronic terminal, including the above-mentioned middle frame.
[0019] In the above-mentioned electronic terminal, the plastic part of the metal-plastic combination of the middle frame fills the fracture, the first accommodation groove, the second accommodation groove and each nano micropore, so that the contact surface between the plastic part and the metal part includes the groove walls of the first accommodation groove and the second accommodation groove in addition to the first side wall and the second side wall, thereby increasing the bonding area between the plastic part and the metal part, further increasing the bonding strength between the metal part and the plastic part, and reducing the probability of cracking at the bonding part of the metal-plastic combination of the middle frame of the electronic terminal. Description of the Drawings
[0020] Figure 1 is a three-dimensional structural schematic diagram of the metal-plastic combination provided by an embodiment of the present application.
[0021] Figure 2 is Figure 1 an exploded schematic diagram of the metal-plastic combination shown.
[0022] Figure 3 is Figure 1 a cross-sectional view of the metal-plastic combination shown along the III-III direction.
[0023] Figure 4 is Figure 1 a three-dimensional structural schematic diagram of the metal part shown.
[0024] Figure 5 is Figure 1 a three-dimensional structural schematic diagram of another perspective of the metal part shown.
[0025] Figure 6 is a three-dimensional structural schematic diagram of the middle frame provided by an embodiment of the present application.
[0026] Main Element Symbol Description
[0027] Middle frame 1000
[0028] Metal-plastic combination 100
[0029] Metal part 10
[0030] Fracture 11
[0031] First side wall 12
[0032] First accommodation groove 121
[0033] First groove wall 1211
[0034] Second groove wall 1212
[0035] Third groove wall 1213
[0036] Fourth groove wall 1214
[0037] Positioning groove 1215
[0038] Positioning protrusion 1216
[0039] Nanopores 122
[0040] Second side wall 13
[0041] Second receiving groove 131
[0042] Plastic part 20 Specific implementation manners
[0043] The following describes in detail the implementation manners of the present application. The examples of the implementation manners are shown in the drawings, in which the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The implementation manners described below with reference to the drawings are exemplary only for explaining the present application and should not be construed as a limitation to the present application.
[0044] In the description of the present application, it should be understood that the terms indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present application. In addition, the terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more features. In the description of the present application, it should be noted that the meaning of "a plurality" is two or more unless otherwise specifically defined.
[0045] In the description of the present application, it should be noted that unless otherwise clearly specified and defined, the term "connection" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection, an electrical connection or a communication with each other, it may be a direct connection, or an indirect connection through an intermediate medium, and it may be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meaning of the above terms in the present application can be understood according to specific circumstances.
[0046] Some embodiments of the present application will be described in detail below with reference to the drawings.
[0047] Please refer to Figure 1 、 Figure 2 and Figure 3, an embodiment of the present application provides a metal-plastic combination member 100, and the metal-plastic combination member 100 includes a metal member 10 and a plastic member 20.
[0048] The metal member 10 is provided with a fracture 11, the fracture 11 has a first side wall 12 and a second side wall 13 oppositely arranged along a first direction, a first receiving groove 121 extending along the first direction is provided on the first side wall 12, a second receiving groove 131 extending along the first direction is provided on the second side wall 13, and a plurality of nano micropores 122 are provided on the groove walls of the first receiving groove 121 and the second receiving groove 131. The plastic member 20 is filled in the fracture 11, the first receiving groove 121, the second receiving groove 131 and each nano micropore 122. Specifically, the plastic member 20 is formed by nano-injection molding in the fracture 11, the first receiving groove 121, the second receiving groove 131 and each nano micropore 122, so as to be integrated with the metal member 10 to obtain the metal-plastic combination member 100. Wherein, the first direction is Figure 1 and Figure 5 the X-axis direction shown.
[0049] In the above metal-plastic combination member 100, the plastic member 20 is filled in the fracture 11, the first receiving groove 121, the second receiving groove 131 and each nano micropore 122 to be integrated with the metal member 10. The contact surface between the plastic member 20 and the metal member 10 includes, in addition to the first side wall 12 and the second side wall 13, the groove walls of the first receiving groove 121 and the second receiving groove 131, thereby increasing the contact area between the plastic member 20 and the metal member 10. And because a plurality of nano micropores 122 are provided on the groove walls of the first receiving groove 121 and the second receiving groove 131, the plastic member 20 fills in each nano micropore 122 to generate an anchor bolt effect, and the plastic member 20 generates an anchor bolt effect with the groove walls of the first receiving groove 121 and the second receiving groove 131, thereby increasing the area where the anchor bolt effect is generated, and further increasing the bonding strength between the metal member 10 and the plastic member 20, and reducing the probability of cracking at the bonding part after the metal-plastic combination member 100 is formed.
[0050] Specifically, the metal member 10 can be made of stainless steel, aluminum or aluminum alloy. In this embodiment, the metal member 10 is made of 6-series aluminum alloy, and the 6-series aluminum alloy is an aluminum-magnesium-silicon alloy; the plastic member 20 is made of reinforced PBT material. Among them, the PBT material is an engineering plastic, and the reinforced PBT material is an engineering plastic reinforced by adding glass fiber. In this embodiment, the plastic member 20 is made of PBT+30GF, and PBT+30GF is an engineering plastic reinforced by adding 30% glass fiber.
[0051] In this embodiment, before the plastic part 20 is formed in the fracture 11, the first receiving groove 121, the second receiving groove 131 and each nano micropore 122 by nano-injection molding, the inner walls of the first receiving groove 121 and the second receiving groove 131 are subjected to nano-treatment to form nano micropores 122. Among them, the nano-treatment is T treatment or E treatment. The principle of T treatment is chemical corrosion; the technical principle of E treatment is the combination of chemical corrosion and electrochemistry technology, specifically using the principle of aluminum alloy anodic oxidation film formation, chemical reaming technology and chemical bonding technology. It can be understood that the nano-treatment can also be other treatment means that can form nano micropores 122 on the inner walls of the first receiving groove 121 and the second receiving groove 131.
[0052] In this embodiment, the first receiving groove 121 is a rectangular groove, and the total area of the inner wall of the first receiving groove 121 is greater than or equal to three times the cross-sectional area of the first receiving groove 121 along the first direction. In this way, the bonding area between the plastic part 20 and the metal part 10 is increased, which is convenient for improving the bonding strength between the plastic part 20 and the metal part 10.
[0053] After the metal part 10 and the plastic part 20 are butted and integrated by nano-injection molding, the bonding strength between the formed metal part 10 and the plastic part 20 is about 1 / 3 of the tensile strength of the plastic part 20. By observing the microscopic structure of the metal part 10 after nano-treatment under an electron microscope, it can be found that the porosity is about 1 / 3, that is, the area of the plastic part 20 that can actually generate bonding force is about 1 / 3 of the butting surface area between the metal part 10 and the plastic part 20. And in this application, by providing the first receiving groove 121 and the second receiving groove 131, and making the total area of the inner wall of the first receiving groove 121 greater than or equal to three times the cross-sectional area of the first receiving groove 121 along the first direction, so that the bonding surface area between the plastic part 20 and the metal part 10 is three times or more of the cross-sectional area of the first receiving groove 121 along the first direction. Without changing the porosity of the metal part 10, the area of the plastic part 20 that can actually generate bonding force is not less than the cross-sectional area of the first receiving groove 121 along the first direction, that is, the area of the plastic part 20 that can actually generate bonding force is increased, thereby improving the bonding strength between the plastic part 20 and the metal part 10, and enabling the bonding strength between the plastic part 20 and the metal part 10 to be equal to the tensile strength of the plastic part 20, so as to obtain a metal-plastic bonded part 100 with strong bonding strength.
[0054] Taking the plastic part 20 as PBT + 30GF and the metal part 10 as 6-series aluminum alloy as an example, the tensile strength of the PBT + 30GF material itself is 110MP. After the metal part 10 and the plastic part 20 are butted and integrated by nano-injection molding, the bonding strength is about 30 - 36Mpa. After adopting the technical solution of this application, the bonding strength of the metal-plastic bonded part 100 can be close to 110MP.
[0055] Please further refer to Figure 3 . In this embodiment, the cross-sectional area of the first receiving groove 121 in the first direction is S1, and S1 satisfies the following relationship: S1 = S2 * P2 / P1; where S2 is the cross-sectional area of the metal part 10 corresponding to the first receiving groove 121 in the first direction, P1 is the tensile strength of the plastic part 20, and P2 is the tensile strength of the metal part 10. Specifically, by setting S1 * P1 = S2 * P2, at the joint of the plastic part 20 and the metal part 10, the maximum forces that the plastic part 20 and the metal part 10 can withstand when being broken are the same. In this way, the maximum forces that the plastic part 20 and the metal part 10 can withstand are both relatively large, so that the plastic part 20 and the metal part 10 are not easily broken, reducing the probability of cracking of the plastic part 20 or the metal part 10. In this embodiment, when the materials of the plastic part 20 and the metal part 10 are determined, P1 and P2 can be determined. Therefore, when the size of the metal part 10 is also determined, S1 can be obtained through the above relationship.
[0056] Please further refer to Figure 4 and Figure 5 . In this embodiment, the first receiving groove 121 extends along a second direction perpendicular to the first direction to the inner side wall of the metal part 10. The adjacent two sides of the bottom of the first receiving groove 121 extend along the second direction and the third direction respectively. The first direction, the second direction, and the third direction are perpendicular to each other in pairs. The length of one side of the bottom of the first receiving groove 121 extending in the third direction is A, the length of one side of the bottom of the first receiving groove 121 extending in the second direction is B, and the depth of the first receiving groove 121 in the first direction is C. C satisfies the following relationship: C ≧ 2S1 / (2B + A). By extending the first receiving groove 121 along the second direction perpendicular to the first direction to the inner side wall of the metal part 10, only the plastic part 20 at the fracture 11 can be seen from the outside of the metal part 10, and the plastic part 20 in the first receiving groove 121 cannot be seen. In this way, it is beneficial to improve the aesthetic degree of the metal-plastic combination part 100. Among them, the second direction is Figure 1 and Figure 5 the Y-axis direction shown in Figure 1 and Figure 5 the Z-axis direction shown in
[0057] Specifically, the first receiving groove 121 has a first groove wall 1211 and a second groove wall 1212, a third groove wall 1213, and a fourth groove wall 1214 that extend from the first groove wall 1211 toward the second side wall 13 and are connected in sequence. The second groove wall 1212 and the fourth groove wall 1214 are disposed opposite to each other. The total area of the first groove wall 1211, the second groove wall 1212, the third groove wall 1213, and the fourth groove wall 1214 is the total area of the groove walls of the first receiving groove 121. Since the first receiving groove 121 is a rectangular groove, the area of the bottom of the first receiving groove 121 is the same as the area S1 of the cross-section of the first receiving groove 121 along the first direction. And since the first groove wall 1211 is the bottom of the first receiving groove 121, therefore, the combined area of the second groove wall 1212, the third groove wall 1213, and the fourth groove wall 1214 is greater than or equal to twice the area S1 of the cross-section of the first receiving groove 121 along the first direction. The areas of both the second groove wall 1212 and the fourth groove wall 1214 are B*C, and the area of the third groove wall 1213 is A*C. Thus, C*(2B + A) ≥ 2S1. Further, when the materials of the plastic part 20 and the metal part 10, the dimensions of the plastic part 20, and the total area of the bonding region of the metal-plastic composite part 100 are determined, the depth C of the first receiving groove 121 along the first direction can be obtained. In this way, by selecting the value of the depth C of the first receiving groove 121 along the first direction, the area where the plastic part 20 and the metal part 10 can actually generate a bonding force is not less than the area of the cross-section of the first receiving groove 121 along the first direction, so that the bonding strength between the plastic part 20 and the metal part 10 can reach the required level.
[0058] In this embodiment, the second receiving groove 131 has the same structure as the first receiving groove 121, and the second receiving groove 131 and the first receiving groove 121 are symmetrically arranged with respect to the fracture 11. Specifically, the second receiving groove 131 has the same structure as the first receiving groove 121, and the mating relationship between the plastic part 20 and the second receiving groove 131 is the same as the mating relationship between the plastic part 20 and the first receiving groove 121. Thus, the bonding strength between the plastic part 20 and the first side wall 12 and the second side wall 13 at the fracture 11 of the metal part 10 can both reach the required level.
[0059] In this embodiment, the regions of the first side wall 12 and the second side wall 13 where the first receiving groove 121 and the second receiving groove 131 are not opened also have a plurality of nano micropores 122. With such an arrangement, an anchor bolt effect is also generated between the plastic part 20 and the regions of the first side wall 12 and the second side wall 13 where the first receiving groove 121 and the second receiving groove 131 are not opened, thereby further improving the bonding strength between the metal part 10 and the plastic part 20.
[0060] In this embodiment, at least one positioning groove 1215 is provided on the groove walls of the first receiving groove 121 and the second receiving groove 131. The plastic part 20 is filled in the positioning groove 1215 at the same time, and the groove wall of the positioning groove 1215 also has a plurality of nano micropores 122. Specifically, by providing the positioning groove 1215, the plastic part 20 is injection-molded by nano-injection molding on the fracture 11, the first receiving groove 121, the second receiving groove 131 and each nano micropore 122. When combined with the metal part 10 into one body, the plastic part 20 will be filled in the positioning groove 1215 and the nano micropores 122 on the groove wall of the positioning groove 1215 at the same time. With such a setting, the plastic part 20 in the positioning groove 1215 and the positioning groove 1215 play a clamping role, which is convenient for further improving the bonding reliability between the plastic part 20 and the metal part 10.
[0061] In this embodiment, at least one positioning protrusion 1216 is provided on the groove walls of the first receiving groove 121 and the second receiving groove 131. The plastic part 20 is wrapped around the positioning protrusion 1216 at the same time, and the positioning protrusion 1216 also has a plurality of nano micropores 122. Specifically, by providing the positioning protrusion 1216, the plastic part 20 is injection-molded by nano-injection molding on the fracture 11, the first receiving groove 121, the second receiving groove 131 and each nano micropore 122. When combined with the metal part 10 into one body, the plastic part 20 will wrap around the positioning protrusion 1216 and be filled in the nano micropores 122 of the positioning protrusion 1216 at the same time. With such a setting, the positioning protrusion 1216 and the plastic part 20 wrapping around the positioning protrusion 1216 play a clamping role, which is convenient for further improving the bonding reliability between the plastic part 20 and the metal part 10.
[0062] The metal-plastic combination part 100 provided by the embodiment of the present application forms an anchor bolt effect between the plastic part 20 and the respective groove walls of the first accommodation groove 121 and the second accommodation groove 131 by opening the first accommodation groove 121 and the second accommodation groove 131 and arranging a plurality of nano micropores 122 on each groove wall, thereby increasing the bonding strength between the metal part 10 and the plastic part 20, and further reducing the probability of cracking at the joint during the post-production process after the metal-plastic combination part 100 is formed; by setting the total area of the groove wall of the first accommodation groove 121 to be greater than or equal to three times the cross-sectional area of the first accommodation groove 121 along the first direction, the area where the plastic part 20 and the metal part 10 can actually generate a bonding force is not less than the cross-sectional area of the first accommodation groove 121 along the first direction under the condition that the porosity of the metal part 10 remains unchanged, thereby improving the bonding strength between the plastic part 20 and the metal part 10, and making the bonding strength of the metal-plastic combination part 100 equal to the tensile strength of the plastic part 20; by setting S1*P1 = S2*P2, the maximum force that the plastic part 20 and the metal part 10 can withstand when being pulled apart is the same at the joint. In this way, the maximum forces that the plastic part 20 and the metal part 10 can withstand are both relatively large, so that the plastic part 20 and the metal part 10 are not easily broken; by arranging at least one positioning groove 1215 on the groove walls of the first accommodation groove 121 and the second accommodation groove 131, the plastic part 20 in the positioning groove 1215 and the positioning groove 1215 play a clamping role, which is convenient for further improving the bonding reliability between the plastic part 20 and the metal part 10; by arranging at least one positioning protrusion 1216 on the groove walls of the first accommodation groove 121 and the second accommodation groove 131, the positioning protrusion 1216 and the plastic part 20 covering the positioning protrusion 1216 play a clamping role, which is convenient for further improving the bonding reliability between the plastic part 20 and the metal part 10.
[0063] Please refer to Figure 6 for reference. The embodiment of the present application also provides a middle frame 1000, and the middle frame 1000 includes the above-mentioned metal-plastic combination part 100. Specifically, the middle frame 1000 can be the middle frame 1000 of an electronic product, such as the middle frame 1000 of a mobile phone, the middle frame 1000 of a notebook computer, etc.
[0064] Specifically, in the metal-plastic combination part 100 of the middle frame 1000, the plastic part 20 fills the fracture 11, the first accommodation groove 121, the second accommodation groove 131 and each nano micropore 122. The contact surface between the plastic part 20 and the metal part 10 includes not only the first side wall 12 and the second side wall 13, but also the respective groove walls of the first accommodation groove 121 and the second accommodation groove 131, thereby increasing the contact area between the plastic part 20 and the metal part 10, further increasing the bonding strength between the metal part 10 and the plastic part 20, and reducing the probability of cracking at the joint of the metal-plastic combination part 100 of the middle frame 1000.
[0065] As can be seen from the foregoing, the first receiving groove 121 extends along a second direction perpendicular to the first direction to the inner side wall of the metal part 10. From the outside of the metal part 10, only the plastic part 20 at the fracture 11 can be seen, and the plastic part 20 in the first receiving groove 121 cannot be seen. Only from the inside of the metal part 10 can the plastic part 20 in the first receiving groove 121 be seen. Such a setting facilitates improving the aesthetic degree of the metal part 10. Thus, when the metal-plastic combination part 100 is used on the middle frame 1000, only the plastic part 20 at the fracture 11 can be seen from the outside of the middle frame 1000, thereby also improving the aesthetic degree of the middle frame 1000.
[0066] The embodiment of the present application further provides an electronic terminal (not shown in the figure), and the electronic terminal includes the above-mentioned middle frame 1000. Specifically, the electronic terminal may be an electronic product, such as a mobile phone, a laptop computer, etc.
[0067] Specifically, in the metal-plastic combination part 100 of the middle frame 1000 of the electronic terminal, the plastic part 20 is filled in the fracture 11, the first receiving groove 121, the second receiving groove 131 and each nano micropore 122. The contact surface between the plastic part 20 and the metal part 10 includes not only the first side wall 12 and the second side wall 13, but also each groove wall of the first receiving groove 121 and the second receiving groove 131, thereby increasing the contact area between the plastic part 20 and the metal part 10, and further increasing the bonding strength between the metal part 10 and the plastic part 20, and reducing the probability of cracking at the joint of the metal-plastic combination part 100 of the middle frame 1000.
[0068] For those skilled in the art, it is obvious that the present application is not limited to the details of the above-mentioned exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or basic characteristics of the present application. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present application is defined by the appended claims rather than the above description. Therefore, it is intended to cover all changes falling within the meaning and scope of the equivalent elements of the claims in the present application.
[0069] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application and are not restrictive. Although the present application has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present application can be modified or equivalently replaced without departing from the spirit and scope of the technical solutions of the present application.
Claims
1. A metal-plastic combination part, characterized in that, Comprising: A metal part is provided with a fracture. The fracture has a first side wall and a second side wall oppositely arranged in a first direction. A first accommodation groove extending in the first direction is formed on the first side wall, and a second accommodation groove extending in the first direction is formed on the second side wall. The groove walls of the first accommodation groove and the second accommodation groove both have a plurality of nano micropores; A plastic part is filled in the fracture, the first accommodation groove, the second accommodation groove and each of the nano micropores.
2. The metal-plastic combination part according to claim 1, characterized in that, The first accommodation groove is a rectangular groove, and the total area of the groove wall of the first accommodation groove is greater than or equal to three times the cross-sectional area of the first accommodation groove in the first direction.
3. The metal-plastic bonded part according to claim 2, wherein The cross-sectional area of the first accommodation groove in the first direction is S1, and S1 satisfies the following relational expression: S1 = S2 * P2 / P1 Wherein, S2 is the cross-sectional area of the metal part corresponding to the first accommodation groove in the first direction, P1 is the tensile strength of the plastic part, and P2 is the tensile strength of the metal part.
4. The metal-plastic combination part according to claim 3, characterized in that, The first accommodation groove extends to the inner side wall of the metal part in a second direction perpendicular to the first direction. The two adjacent sides of the bottom of the first accommodation groove extend in the second direction and a third direction respectively. The first direction, the second direction and the third direction are perpendicular to each other in pairs. The length of one side of the bottom of the first accommodation groove extending in the third direction is A, and the length of one side of the bottom of the first accommodation groove extending in the second direction is B. The depth of the first accommodation groove in the first direction is C, and C satisfies the following relational expression: C ≧ 2S1 / (2B + A).
5. The metal-plastic composite part according to any one of claims 1 to 4, characterized in that The second accommodation groove has the same structure as the first accommodation groove, and the second accommodation groove is symmetrically arranged with the first accommodation groove with respect to the fracture.
6. The metal-plastic combination according to claim 1, characterized in that, The regions of the first side wall and the second side wall where the first accommodation groove and the second accommodation groove are not formed also have a plurality of the nano micropores.
7. The metal-plastic combination part according to claim 1, characterized in that, The plastic part is formed in the fracture, the first accommodation groove, the second accommodation groove and each of the nano micropores by nano injection molding.
8. The metal-plastic combination part according to claim 1, characterized in that, At least one positioning groove and / or at least one positioning protrusion are provided on the groove walls of the first accommodation groove and the second accommodation groove. The plastic part is filled in the positioning groove and / or coated on the positioning protrusion at the same time. The groove wall of the positioning groove and / or the positioning protrusion also have a plurality of the nano micropores.
9. A middle frame, characterized in that, Comprising the metal-plastic combination part according to any one of claims 1-8.
10. An electronic terminal, characterized in that, Comprising the middle frame according to claim 9.