Metal-plastic composite part, manufacturing method, housing and electronic equipment

Abstract

The present application provides a method for manufacturing a metal-plastic composite, comprising the steps of: forming a metal substrate with a receiving hole; injecting a first plastic into the metal substrate to form a metal-plastic blank; using a tool to process the receiving hole and the first plastic to remove part of the first plastic and form a receiving space; injecting a second plastic into the metal-plastic blank to form a metal-plastic composite. The present application also provides a metal-plastic composite, a housing and an electronic device. The manufacturing method of the metal-plastic composite, the metal-plastic composite, the housing and the electronic device form the metal-plastic composite by performing secondary injection molding on the metal substrate, thereby enhancing the stability of the combination of plastic and metal and improving the overall quality of the metal-plastic composite. In addition, the manufacturing method of the metal-plastic composite is simple, highly operable, convenient for large-scale production, and improves the processing efficiency of the metal composite.

Description

Technical Field

[0001] The present application relates to the technical field of composite body preparation, and in particular to a metal-plastic composite part, a manufacturing method, a housing and an electronic device. Background Art

[0002] Metal-plastic parts are composite parts made of metal and plastic, and are widely used in the frame structure of electronic devices. The specific method of making the frame structure is: multiple metal parts are placed in the ring groove of the mold with a certain gap, and then the mold is closed to inject the metal parts to form the frame structure. Among them, the metal parts mainly play a supporting role, and the plastic injected in the gap between the metal parts provides a signal channel for the electronic equipment. At present, the processing of the frame structure is mostly done by one-time injection molding.

[0003] The current frame structure is becoming increasingly thinner and lighter. During the injection molding process, the precision of parameters such as injection pressure and plastic injection flow rate for the thin frame structure is extremely high. If the gap between metal parts is directly injected, if there is a slight deviation in the parameters, it is easy to cause the metal part and the plastic to be unstable, and the end face of the metal body in contact with the plastic to be deformed (especially for aluminum parts). If the metal part and the plastic are not combined stably, when the frame structure collides or falls, gaps are likely to appear at the joint between the metal part and the plastic, reducing the quality of the metal plastic parts. If the end face of the metal body is deformed, users can easily see the deformation defects from the appearance, which affects the user's physical sense. Summary of the invention

[0004] In view of the above, it is necessary to propose a metal-plastic composite part, a manufacturing method, a housing and an electronic device to solve the above problems.

[0005] An embodiment of the present application provides a method for manufacturing a metal-plastic composite part, comprising the steps of:

[0006] forming a metal substrate having a receiving hole, wherein the receiving hole penetrates two opposite side surfaces of the metal substrate;

[0007] Injecting a first plastic into the metal substrate to form a metal-plastic blank, wherein the receiving hole is filled with the first plastic;

[0008] Using a tool to process the receiving hole and the first plastic to remove a portion of the first plastic and form a receiving space;

[0009] A second plastic is injection molded into the metal-plastic blank to form a metal-plastic composite part, wherein the accommodating space is filled with the second plastic.

[0010] In one embodiment, the receiving hole includes a receiving groove and a through hole that communicate with each other, and the step of forming a metal substrate having the receiving hole includes:

[0011] The tool is used to process a receiving groove on the inner side surface of the metal substrate;

[0012] The tool is used to process a through hole penetrating the outer side surface of the metal substrate at the bottom of the accommodating groove.

[0013] In one embodiment, the receiving hole includes a communicating receiving groove and a through hole, the metal substrate includes a first metal substrate and a second metal substrate, and the step of forming the metal substrate with the receiving hole includes:

[0014] manufacturing a first metal substrate and a second metal substrate;

[0015] Disposing the first metal substrate and the second metal substrate at intervals to form the through hole;

[0016] A tool is used to process the inner side surfaces of the first metal substrate and the second metal substrate so as to form the accommodation groove between the first metal substrate and the second metal.

[0017] In one embodiment, the receiving groove includes a first receiving groove and a second receiving groove that are connected, the tool includes a first tool and a second tool, and the step of using the tool to process the receiving groove on the inner side surface of the metal substrate includes:

[0018] Using the first cutting tool to machine a first receiving groove on the inner side surface of the metal substrate;

[0019] The second tool is used to further process a second accommodating groove at the bottom of the first accommodating groove; wherein the cross-sectional area of ​​the first accommodating groove is larger than that of the second accommodating groove, and the second accommodating groove is communicated with the through hole.

[0020] In one embodiment, the first plastic includes a first groove plastic, a second groove plastic, and a hole plastic, and the step of injecting the first plastic into the metal substrate to form a metal plastic blank includes:

[0021] placing the metal substrate in a mold;

[0022] The molds are closed, and the first groove plastic, the second groove plastic, and the hole plastic are respectively injected into the first accommodating groove, the second accommodating groove, and the through hole to form a metal-plastic blank.

[0023] In one embodiment, the first plastic further includes surface plastic, and the step of injecting the first plastic into the metal substrate to form the metal-plastic blank further includes: injecting the surface plastic into the inner side of the metal substrate, wherein the surface plastic covers the first groove plastic in the first receiving groove.

[0024] In one embodiment, the accommodation space includes an enlarged cavity and an extended cavity that communicate with each other, and the step of using a tool to process the accommodation hole and the first plastic to remove a portion of the first plastic and form the accommodation space includes:

[0025] The through hole is enlarged by using the tool to mill out the hole plastic in the through hole and form an enlarged cavity, wherein the cross-sectional area of ​​the enlarged cavity is larger than the cross-sectional area of ​​the through hole;

[0026] Based on the enlarged cavity, the tool is used to mill in the direction of the receiving groove to remove part of the second groove plastic in the receiving groove and form an extended cavity.

[0027] In one embodiment, the second plastic includes expanded plastic and extended plastic, and the step of injecting the second plastic into the metal-plastic blank to form the metal-plastic composite part includes:

[0028] Placing the metal-plastic blank in a mold;

[0029] The molds are closed, and the enlarged plastic and the extended plastic are respectively injected into the enlarged cavity and the extended cavity to form a metal-plastic composite part.

[0030] In one embodiment, the method for manufacturing the metal-plastic composite further comprises the step of: etching the metal substrate to form micro holes on the inner side surface, the outer side surface of the metal substrate and the surface of the receiving hole.

[0031] In one embodiment, the method for manufacturing the metal-plastic composite part further comprises the steps of:

[0032] The surface of the metal-plastic composite is processed by using a cutting tool to remove the micro holes on the outer side of the metal substrate and a part of the second plastic.

[0033] The present application also provides a metal-plastic composite part, comprising a first plastic part, a second plastic part and a metal substrate. The first plastic part is provided with an extension cavity, and the second plastic part is at least partially embedded in the extension cavity by injection molding. The metal substrate is provided with a through hole communicating with the extension cavity, the through hole passes through two opposite side surfaces of the metal substrate, and the first plastic part and the second plastic part are filled in the through hole by injection molding.

[0034] In one embodiment, the through hole includes a receiving groove and a receiving space. The receiving groove is provided on the inner side of the metal substrate and is used to receive the first plastic. The receiving space is communicated with the receiving groove, and the receiving space is provided on the outer side of the metal substrate and is used to receive the second plastic. The extension cavity is formed in the receiving space.

[0035] In one embodiment, the receiving hole includes a first receiving groove and a second receiving groove. The first receiving groove is formed on the inner side of the metal substrate. The second receiving groove is formed at the bottom of the first receiving groove and communicates with the receiving space, and the cross-sectional area of ​​the first receiving groove is larger than that of the second receiving groove.

[0036] In one embodiment, the second accommodating groove comprises a side wall and a bottom wall, the side wall is connected to the first accommodating groove, and a circular arc chamfer is formed at the connection between the bottom wall and the side wall.

[0037] In one embodiment, the accommodation space includes an enlarged cavity and the extended cavity. The enlarged cavity is opened on the outer side of the metal substrate. The extended cavity is communicated with the enlarged cavity and extends from the enlarged cavity to the second accommodation groove.

[0038] In one embodiment, the thickness D of the metal substrate satisfies: 0.8 mm < D < 1.9 mm, and the depth H of the through hole of the receiving groove is 1 Satisfy: 0.3mm<H 1 <1mm, the depth of the accommodation space is H 2 Satisfy: 0.5mm≤H 2 ≤0.9mm.

[0039] In one embodiment, the depth H of the enlarged cavity 21 Satisfy: 0.3mm≤H 21 ≤0.5mm, the depth H of the extension cavity 22 Satisfy: 0.2mm≤H 22 ≤0.4mm.

[0040] In one embodiment, the first plastic includes a first groove plastic and a second groove plastic. The first groove plastic is filled in the first containing groove. The second groove plastic is filled in the second containing groove.

[0041] In one embodiment, the first plastic further includes surface plastic, which fills the inner side of the metal substrate and covers the first groove plastic.

[0042] In one embodiment, there are a plurality of metal substrates, and the plurality of metal substrates are arranged in a spaced-apart manner. There are a plurality of corresponding first plastics and surface plastics, and the plurality of surface plastics are integrally formed.

[0043] In one embodiment, at least one of the inner side surface of the metal substrate and the surface of the containing groove forms micro holes, and at least one of the outer side surface of the metal substrate and the surface of the containing space is a smooth surface.

[0044] In one embodiment, the roughness range of at least one of the inner side surface of the metal substrate and the surface of the containing groove is Ra10-30, and the roughness range of at least one of the outer side surface of the metal substrate and the surface of the containing space is Ra0.5-1.6.

[0045] In one embodiment, the first plastic is at least partially embedded in the second plastic, or the second plastic is at least partially embedded in the first plastic, or the first plastic and the second plastic are mutually embedded.

[0046] The present application also provides a housing, comprising the metal-plastic composite member described in any one of the above embodiments.

[0047] The present application also provides an electronic device, comprising the above-mentioned housing.

[0048] The manufacturing method of the metal-plastic composite, the metal-plastic composite, the housing and the electronic device are formed by performing secondary injection molding on the metal substrate to form the metal-plastic composite. The first injection molding forms the first plastic on the metal substrate to improve the strength of the metal substrate and prevent the pressure of the second injection molding from deforming the metal substrate; the metal substrate after the first injection molding is expanded to remove some deformed parts, and the second injection molding is performed to form the second plastic on the metal substrate, thereby enhancing the stability of the combination of plastic and metal, improving the overall quality of the metal-plastic composite, and reducing the probability of seeing the deformation of the metal substrate from the appearance, thereby enhancing the user's good physical experience of the metal-plastic composite. In addition, the manufacturing method of the metal-plastic composite is simple, highly operable, convenient for large-scale production, and improves the processing efficiency of the metal composite. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] Figure 1 Schematic diagram of a process for manufacturing a metal-plastic composite part according to an embodiment of the present application.

[0050] Figure 2 Schematic diagram of the cross-section of the structure change during the manufacturing process of the metal-plastic composite part according to one embodiment of the present application.

[0051] Figure 3 FIG. 1 is a schematic diagram of the contact structure between the first plastic and the second plastic in an embodiment of the present application.

[0052] Figure 4 FIG. 4 is a schematic diagram of the contact structure between the first plastic and the second plastic in another embodiment of the present application.

[0053] Figure 5 FIG. 4 is a schematic diagram of the contact structure between the first plastic and the second plastic in another embodiment of the present application.

[0054] Figure 6 Schematic diagram of the process of step S10 in one embodiment of the present application.

[0055] Figure 7 Schematic diagram of the process of step S20 in one embodiment of the present application.

[0056] Figure 8 Schematic diagram of the process of step S30 in one embodiment of the present application.

[0057] Fig. 9 Schematic diagram of the process of step S40 in one embodiment of the present application.

[0058] Fig.10 FIG. 1 is a flow chart of step S10 in another embodiment of the present application.

[0059] Fig.11 Schematic diagram of the structure of a metal-plastic composite member at a first angle according to an embodiment of the present application.

[0060] Fig.12 FIG. 1 is a schematic diagram of the exploded structure of a metal-plastic composite component according to an embodiment of the present application.

[0061] Fig.13 Schematic diagram of the structure of a metal-plastic composite member at a second angle according to an embodiment of the present application.

[0062] Main component symbols

[0063] Metal-plastic composite parts10

[0064] First Plastic 110

[0065] The first protrusion 112

[0066] The first recess 114

[0067] The second protrusion 115

[0068] The second recess 116

[0069] First slot plastic 1110

[0070] Second slot plastic 1120

[0071] Surface plastic 1130

[0072] Second Plastic 120

[0073] Metal substrate 130

[0074] Inside side 1310

[0075] Outer side 1320

[0076] Through hole 140

[0077] Metal body 1330

[0078] Accommodation hole 142

[0079] Accommodation tank 1410

[0080] Via 1411

[0081] The first receiving groove 1412

[0082] The second receiving groove 1414

[0083] Side wall 1415

[0084] Bottom wall 1416

[0085] Accommodation space 1420

[0086] Enlarged cavity 1422

[0087] Extension cavity 1424 DETAILED DESCRIPTION

[0088] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be understood as limiting the present application.

[0089] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", clockwise", "counterclockwise" and the like indicate positions or positional relationships based on the positions or positional relationships 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 therefore cannot be understood as a limitation on the present application. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0090] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or mutual communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0091] In the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0092] The disclosure below provides many different embodiments or examples to realize the different structures of the present application. In order to simplify the disclosure of the present application, the parts and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the present application. In addition, the present application can repeat reference numbers and / or reference letters in different examples, and this repetition is for the purpose of simplification and clarity, which itself does not indicate the relationship between the various embodiments and / or settings discussed. In addition, the various specific processes and material examples provided by the present application, but those of ordinary skill in the art can appreciate the application of other processes and / or the use of other materials.

[0093] Please also see Figure 1 and Figure 2 An embodiment of the present application provides a method for manufacturing a metal-plastic composite part, comprising the following steps:

[0094] S10 , forming a metal substrate 130 having a receiving hole 142 .

[0095] Specifically, Figure 2 As shown in (a), a metal blank is provided, and a receiving hole 142 is formed in the metal blank by drilling or other methods. The metal blank can be manufactured by machining or mold casting, and the metal blank can be made of stainless steel, aluminum, aluminum alloy, or titanium alloy. S20, the first plastic 110 is injected into the metal substrate 130 to form a metal-plastic blank, wherein the receiving hole 142 is filled with the first plastic 110.

[0096] Specifically, Figure 2 As shown in FIG. 5( b ), the metal substrate 130 is injection molded by an injection molding machine so that the first plastic 110 fills the receiving hole 142 , thereby manufacturing a metal-plastic blank including the metal substrate 130 and the first plastic 110 . Optionally, the first plastic 110 fills the entire receiving hole 142 .

[0097] S30 , using a tool to process the metal plastic blank to remove a portion of the first plastic 110 and form an accommodating space 1420 .

[0098] Specifically, Figure 2 As shown in (c), the tool may be a CNC milling cutter, and the depth H of the accommodation hole 142 is 3 Greater than the depth H of the accommodation space 1420 2 , the depth H of the accommodation hole 142 3 Satisfaction: H 3 >0.9mm, the width D of the receiving hole 142 1 Greater than the width W of the accommodating space 1420 .

[0099] Optionally, the width D of the receiving hole 142 is 1 It can also be less than or equal to the width d of the accommodation space 1420 1 Optionally, the length of the accommodating hole 142 is equal to the length of the accommodating space 1420 , and the cross-sectional area of ​​the accommodating hole 142 is greater than the cross-sectional area of ​​the accommodating space 1420 . Optionally, the cross-sectional area of ​​the accommodating hole 142 may also be less than or equal to the cross-sectional area of ​​the accommodating space 1420 .

[0100] Optionally, the CNC may use the accommodation hole as a processing reference point to dig a hole in the first plastic 110 in the metal plastic blank to remove a portion of the first plastic 110 and form the accommodation space 1420 .

[0101] Optionally, after a portion of the first plastic 110 is removed by CNC, the upper surface of the first plastic 110 may be a plane, a concave surface, or a convex surface.

[0102] S40 , injecting the second plastic 120 into the metal-plastic blank to form the metal-plastic composite part 10 , wherein the accommodating space is filled with the second plastic 120 .

[0103] Specifically, Figure 2 As shown in (d), the first plastic 110 and the second plastic 120 can be made of the same material or different materials, and the materials can be PE, PP, PVC, ABS, etc. The height of the remaining first plastic 110 in the metal-plastic composite 10 can be greater than, equal to, or less than the height of the second plastic 120. The width D of the first plastic 110 is 2is greater than the width of the second plastic 120. Optionally, the width D of the first plastic 110 is 2 Alternatively, the length of the first plastic 110 is equal to the length of the second plastic 120, and the cross-sectional area of ​​the first plastic is greater than the cross-sectional area of ​​the second plastic. Alternatively, the cross-sectional area of ​​the first plastic 110 is also less than or equal to the cross-sectional area of ​​the second plastic 120.

[0104] Optionally, the upper surface of the first plastic 110 is in smooth contact with the lower surface of the second plastic 120 ; of course, the first plastic 110 may also be embedded in the second plastic 120 .

[0105] Specifically, see Figure 3 In one embodiment, the tool processes the upper surface of the first plastic 110 to form at least two first protrusions 112 and at least two first recesses 114, so that when the second plastic 120 is injected, the second plastic 120 also has at least two second protrusions 115 and at least two second recesses 116, and the second protrusions 115 and the second recesses 116 of the second plastic 120 are respectively embedded with the first recesses 114 and the first protrusions 112 of the first plastic 110. See Figure 4 In another embodiment, the tool processes the upper surface of the first plastic 110 to form a first protrusion 112, so that when the second plastic 120 is injected, the second plastic 120 wraps the second protrusion 115. Figure 5 In another embodiment, the second plastic 120 may also be embedded in the first plastic 110 . Specifically, the tool processes the upper surface of the first plastic 110 to form a first recess 114 , so that when the second plastic 120 is injection molded, part of the second plastic 120 is embedded in the second recess 116 of the first plastic 110 .

[0106] In another embodiment, if Figure 1 and Figure 2 As shown, the method for manufacturing the metal-plastic composite part of the present application further includes the following steps:

[0107] S12 , etching the metal substrate 130 to form micro holes on the inner side surface 1310 , the outer side surface 1320 and the surface of the receiving hole 142 of the metal substrate 130 .

[0108] Specifically, the micro-holes can improve the bonding strength between the metal substrate 130 and the plastic when the plastic is injected into the micro-holes. Preferably, the micro-holes have a hole diameter of 30 μm to 80 μm and a hole depth of 30 μm to 80 μm.

[0109] The etching process includes at least one of laser etching, laser engraving, and chemical etching. In other embodiments, other etching methods may also be used as long as micro holes can be formed on the inner side surface, the outer side surface, and the surface of the receiving hole of the metal substrate.

[0110] In another embodiment, if Figure 1 and Figure 2 As shown, the method for manufacturing the metal-plastic composite part of the present application further includes the following steps:

[0111] S50 , using a tool to perform surface treatment on the outer side of the metal-plastic composite 10 to remove micro holes on the outer side of the metal substrate 130 and a portion of the second plastic 120 .

[0112] Specifically, Figure 2 As shown in (e), the tool can be a profiling tool. The tool is used to perform milling on the outer side of the metal substrate 130 to remove the micro holes on the outer side of the metal substrate 130, thereby making the surface of the metal substrate 130 and the expanded hole plastic smooth, improving the appearance quality of the product and enhancing the good physical experience of the user.

[0113] Optionally, the surface roughness of the outer side of the metal substrate 130 and the expanded plastic is less than Ra0.8. Optionally, while the outer side of the metal-plastic composite 10 is milled, the edge of the outer side of the metal-plastic composite 10 is chamfered.

[0114] Please also see Figure 6 and Figure 2 (a), in one embodiment, the receiving hole 142 includes a receiving groove 1410 and a through hole 1411 that communicate with each other, and the step S10 of forming the metal substrate 130 having the receiving hole 142 includes:

[0115] S110a, using a tool to machine a receiving groove 1410 on the inner side surface 1310 of the metal substrate 130 .

[0116] Specifically, the depth of the receiving groove 1410 may range from 0.3 mm to 1 mm, and optionally, the depth of the receiving groove 1410 is 0.8 mm. The width of the receiving groove 1410 ranges from greater than or equal to 1.5 mm, and optionally, the width of the receiving groove 1410 is 1.5 mm.

[0117] S120a, using a tool to machine a through hole 1411 penetrating the outer side of the metal substrate at the bottom of the receiving groove 1410.

[0118] Specifically, the depth of the through hole 1411 may range from 0.3 mm to 0.5 mm, and optionally, the depth of the through hole 1411 is 0.4 mm. The width of the through hole 1411 may range from 0.6 mm to 1.5 mm, and optionally, the width of the through hole 1411 is 0.6 mm. The through hole 1411 is connected to the receiving groove 1410, so that the metal substrate 130 forms two spaced metal bodies 1330, and the through hole 1411 and the receiving groove 1410 are located between the two metal bodies 1330.

[0119] In one embodiment, the receiving groove 1410 includes a first receiving groove 1412 and a second receiving groove 1414, and the tool includes a first tool and a second tool. The step S110a of using the tool to process the receiving groove 1410 on the inner side surface of the metal substrate 130 includes:

[0120] S111a, using a first tool to machine a first receiving groove 1412 on the inner side surface of the metal substrate 130 .

[0121] Specifically, the width range of the first accommodating groove 1412 can be greater than or equal to 1.5 mm, optionally, the width of the first accommodating groove 1412 is 1.5 mm, the depth range of the first accommodating groove 1412 can be 0.3 mm to 0.8 mm, optionally, the depth of the first accommodating groove 1412 is 0.5 mm, optionally, the first tool can be an end tool.

[0122] S112a, using a second tool to further process a second receiving groove 1414 at the bottom of the first receiving groove 1412. The cross-sectional area of ​​the first receiving groove 1412 is greater than the cross-sectional area of ​​the second receiving groove 1414.

[0123] Specifically, the width of the second receiving groove 1414 may be in the range of 0.5 mm to 1.5 mm. Optionally, the width of the second receiving groove 1414 is 0.8 mm. The depth of the second receiving groove 1414 is in the range of less than 0.8 mm. Optionally, the depth of the second receiving groove 1414 is 0.3 mm.

[0124] The cross-sectional area of ​​the first receiving groove 1412 and the second receiving groove 1414 refers to the cross-sectional area perpendicular to the opening direction thereof. The cross-sectional area of ​​the first receiving groove 1412 is larger than the cross-sectional area of ​​the second receiving groove 1414, thereby forming a stepped receiving groove structure, thereby enhancing the bonding strength between the plastic and the receiving groove 1410.

[0125] The inner angle of the second receiving groove 1414 is a circular chamfer R, which can prevent the metal substrate and the plastic from being separated due to stress concentration when the metal-plastic composite 10 is dropped or collided. Specifically, the size of the circular chamfer R is 0.2 mm.

[0126] Optionally, the second tool is a round nose tool.

[0127] Please also see Figure 7 and Figure 2 (b), in one embodiment, the first plastic 110 includes a first groove plastic, a second groove plastic, and a hole plastic. S20 The step of injecting the first plastic 110 into the metal substrate 130 to form a metal plastic blank includes:

[0128] S210, placing the metal substrate 130 in a mold.

[0129] S220 , closing the molds, and injecting first groove plastic, second groove plastic, and hole plastic into the first receiving groove 1412 , the second receiving groove 1414 , and the through hole 1411 , respectively.

[0130] Specifically, the first groove plastic, the second groove plastic and the hole plastic can be injection molded separately or simultaneously. The specific injection molding method needs to be selected in combination with the selected mold.

[0131] The materials of the first groove plastic, the second groove plastic and the hole plastic may be the same or different.

[0132] In one embodiment, the first plastic further includes surface plastic, and the step S20 of injecting the first plastic into the metal substrate 130 to form a metal plastic blank further includes:

[0133] S230 , injecting surface plastic onto the inner side of the metal substrate 130 , so that the surface plastic covers the first groove plastic in the first receiving groove.

[0134] Please also see Figure 8 and Figure 2 (c) In one embodiment, the accommodation space 1420 includes an enlarged cavity 1422 and an extended cavity 1424 that communicate with each other. S30 uses a tool to process the accommodation hole 142 and the first plastic 110 to remove a portion of the first plastic 110 and form the accommodation space 1420. The steps include:

[0135] S310 , using a tool to expand the through hole 1411 of the first metal plastic blank to remove the hole plastic in the through hole and form an expanded cavity 1422 .

[0136] Specifically, the tool is a pointed T-knife, the width range of the enlarged cavity 1422 can be 0.6mm~1.5mm, optionally, the width of the enlarged cavity 1422 is 1.5mm, the depth range of the enlarged cavity 1422 can be 0.3mm~0.5mm, optionally, the depth of the enlarged cavity 1422 is 0.4mm, and the cross-sectional area of ​​the enlarged cavity 1422 is greater than the cross-sectional area of ​​the through hole 1411.

[0137] Specifically, the cross-sectional areas of the enlarged cavity 1422 and the through hole 1411 refer to the cross-sectional areas perpendicular to their opening directions.

[0138] S320 , based on the enlarged cavity 1422 , a tool is used to mill in the direction of the receiving groove 1410 to remove a portion of the second groove plastic in the receiving groove 1410 and form an extended cavity 1424 .

[0139] Specifically, the tool can be a rounded T-cut tool, the inner corner of the extension cavity 1424 is a circular arc chamfer, the width of the extension cavity 1424 can be 0.5mm~1.5mm, optionally, the width of the extension cavity 1424 is 1.5mm, the depth range of the extension cavity 1424 is 0.2mm~0.4mm, optionally, the depth of the extension cavity 1424 is 0.3mm, and the distance between the bottom surface of the extension cavity 1424 and the bottom surface of the second accommodating groove 1414 is greater than the depth of the second accommodating groove 1414, so that the extended plastic (to be explained below) passes through the second groove plastic and is partially embedded in the first groove plastic, thereby increasing the bonding stability between the extended plastic and the first plastic.

[0140] Please also see Fig. 9 and Figure 2 (d) In one embodiment, the second plastic 120 includes expanded plastic and extended plastic. The step S40 of injecting the second plastic 120 into the metal-plastic blank to form the metal-plastic composite 10 includes:

[0141] S410, placing the metal plastic blank in a mold.

[0142] S420 , closing the mold, and injecting the expanded plastic and the extended plastic into the expanded cavity 1422 and the extended cavity 1424 respectively, to form a metal-plastic composite part.

[0143] Specifically, the inner angle of the formed extension cavity 1424 is a circular chamfer r, which can prevent the second groove plastic from being separated from the extension plastic due to stress concentration when the metal-plastic composite is dropped or collided. Optionally, the size of the circular chamfer r is 0.2 mm.

[0144] The manufacturing method of the metal-plastic composite part is to form the metal-plastic composite part 10 by performing secondary injection molding on the metal substrate 130. The first injection molding forms the first plastic 110 on the metal substrate to improve the strength of the metal substrate 130 and prevent the pressure of the second injection molding from deforming the metal substrate; the metal substrate after the first injection molding is expanded to remove some deformed parts, and the second injection molding is performed to form the second plastic 120 on the metal substrate, so as to enhance the stability of the combination of plastic and metal, improve the overall quality of the metal-plastic composite part 10, reduce the probability of seeing the deformation of the metal substrate from the appearance, and enhance the user's good physical experience of the metal-plastic composite part 10. In addition, the manufacturing method of the metal-plastic composite part is simple, highly operable, convenient for large-scale production, and improves the processing efficiency of the metal composite part.

[0145] In one embodiment, the first groove plastic 1110 , the second groove plastic 1120 , the surface plastic 1130 , the expanded plastic, and the extended plastic may be made of the same material or different materials, such as PE, PP, PVC, ABS, etc.

[0146] The metal-plastic composite 10 can be applied to electronic devices, and the signals in the electronic devices can be transmitted outward from the first groove plastic 1110, the second groove plastic 1120, the extension plastic, and the expanded plastic. It is worth noting that metal chips will be formed when cutting the accommodating space 1420, and the metal chips are not cleaned up and are likely to remain at the bottom of the extension cavity 1424. In the present application, the bottom surface of the extension cavity 1424 and the bottom surface of the second accommodating groove 1414 have a sufficient distance to prevent the residual metal chips in the extension cavity 1424 from being connected to the metal substrate 130 and interfering with the transmission of signals in the electronic device.

[0147] Another embodiment of the present application provides a method for manufacturing a metal-plastic composite part. This embodiment is substantially the same as the above embodiment, except that step S10 is different. The above metal substrate 130 can be an integrally formed metal material. The metal substrate 130 of this embodiment is composed of two metal materials. Step S10 is specifically as follows.

[0148] Please also see Fig.10 and Figure 2 (a), in one embodiment, the receiving hole 142 includes a receiving groove 1410 and a through hole 1411 that communicate with each other, and the metal substrate includes a first metal substrate and a second metal substrate. S10 The step of forming the metal substrate having the receiving hole 142 includes:

[0149] S110b, providing a first metal substrate and a second metal substrate.

[0150] Specifically, the first metal substrate and the second metal substrate can be manufactured by machining or mold casting.

[0151] S111b, using a first tool to process first receiving grooves 1412 on inner side surfaces of the first metal substrate and the second metal substrate respectively.

[0152] Specifically, the width range of the first accommodating groove 1412 can be greater than or equal to 1.5 mm, optionally, the width of the first accommodating groove 1412 is 1.5 mm, the depth range of the first accommodating groove 1412 can be 0.3 mm to 0.8 mm, optionally, the depth of the first accommodating groove 1412 is 0.5 mm, optionally, the first tool is an end tool.

[0153] S112b, using a second tool to further process a second accommodating groove 1414 at the bottom of the first accommodating groove 1412; wherein the cross-sectional area of ​​the first accommodating groove 1412 is greater than the cross-sectional area of ​​the second accommodating groove.

[0154] Specifically, the inner angle of the second receiving groove 1414 is a circular chamfer R, and the size of the circular chamfer R is 0.2 mm. Optionally, the second tool is a round nose tool.

[0155] S120b, spacing the first metal substrate and the second metal substrate to form a through hole 1411.

[0156] Specifically, the depth of the through hole 1411 may range from 0.3 mm to 0.5 mm, and optionally, the depth of the through hole 1411 is 0.4 mm. The width of the through hole 1411 may range from 0.6 mm to 1.5 mm, and optionally, the width of the through hole 1411 is 0.6 mm.

[0157] Compared with the previous embodiment, the present embodiment can directly form the through hole 1411 by spacing the first metal substrate and the second metal substrate, thereby eliminating the processing process of step S120a. Meanwhile, in the previous embodiment, the processing quality of the receiving groove 1410 processed by the metal substrate cannot be directly observed. In the present embodiment, the tool mills the first metal substrate and the second metal substrate respectively to obtain the receiving groove, and the receiving groove can be directly observed to improve the processing efficiency thereof.

[0158] See also Fig.11 An embodiment of the present application provides a metal-plastic composite 10, which can be made by the method for making a metal-plastic composite described in the above embodiment. The metal-plastic composite 10 includes a first plastic 110, a second plastic 120 and a metal substrate 130. The first plastic 110 is connected to the second plastic 120.

[0159] See also Fig.12 The metal substrate 130 is provided with a through hole 140 , and the first plastic 110 and the second plastic 120 are filled in the through hole 140 by injection molding.

[0160] In one embodiment, the through hole 140 includes a receiving groove 1410 and a receiving space 1420. The receiving groove 1410 is provided on the inner side of the metal substrate 130 for receiving the first plastic 110. The receiving space 1420 is communicated with the receiving groove 1410 and is provided on the outer side of the metal substrate 130 for receiving the second plastic 120.

[0161] The cross-sectional area of ​​the receiving groove 1410 along the direction perpendicular to the opening thereof is larger than the cross-sectional area of ​​the receiving space 1420 along the direction perpendicular to the opening thereof, and the first plastic 110 partially wraps the second plastic 120 .

[0162] In one embodiment, the receiving groove 1410 includes a first receiving groove 1412 and a second receiving groove 1414. The first receiving groove 1412 is formed on the inner side of the metal substrate 130. The second receiving groove 1414 is formed at the bottom of the first receiving groove 1412 and communicates with the receiving space 1420, and the cross-sectional area of ​​the first receiving groove 1412 is greater than the cross-sectional area of ​​the second receiving groove 1414.

[0163] The cross-sectional area of ​​the first receiving groove 1412 and the cross-sectional area of ​​the second receiving groove 1414 are both cross-sectional areas along a direction perpendicular to the opening of the through hole 140. The inner side surface and the outer side surface refer to two opposite sides of the metal substrate 130.

[0164] In one embodiment, the second receiving groove 1414 includes a side wall 1415 and a bottom wall 1416. The side wall 1415 is connected to the first receiving groove 1412.

[0165] A circular chamfer R is formed at the connection between the bottom wall 1416 and the side wall 1415 to avoid stress concentration at the connection between the first plastic 110 and the metal substrate 130, to prevent the separation of the first plastic 110 and the metal substrate 130 caused by the metal-plastic composite 10 falling or bumping, and to improve the bonding strength between the first plastic 110 and the metal substrate 130. Preferably, the size of the circular chamfer R is 0.2 mm.

[0166] In one embodiment, the accommodation space 1420 includes an enlarged cavity 1422 and an extended cavity 1424. The enlarged cavity 1422 is opened on the outer side of the metal substrate 130. The extended cavity 1424 is connected to the enlarged cavity 1422 and extends from the enlarged cavity 1422 to the second accommodation groove 1414. Specifically, the first plastic 110 wraps the second plastic 120 located in the second accommodation groove 1414.

[0167] See also Fig.13 In one embodiment, the thickness D of the metal substrate 130 satisfies: 0.8 mm < D < 1.9 mm, and the depth H of the receiving groove 1410 is 1 Satisfy: 0.3mm≤H 1 ≤1mm, depth of accommodation space H 2 Satisfy: 0.5mm≤H 2 ≤0.9mm. Preferably, D is 1mm, H 1 0.5mm, H 2 It is 0.8mm.

[0168] Among them, H 1 , H 2 They respectively represent the lengths of the through hole 140 and the accommodating space 1420 along a direction perpendicular to the inner side surface 1310 of the metal substrate 130 .

[0169] In one embodiment, the opening width W of the enlarged cavity satisfies: 0.6 mm ≤ W ≤ 1.5 mm, and the depth H of the enlarged cavity satisfies: 21 Satisfy: 0.3≤H 21 ≤0.5mm, depth of extended cavity H 22 Satisfy: 0.2mm≤H 22 ≤0.4mm. Optionally, W is 1mm, H 21 0.4mm, H 22 It is 0.4mm.

[0170] Wherein, W represents the length of the enlarged cavity 1422 along the direction parallel to the inner side surface of the metal substrate 130; H 21 and H 22 They respectively represent the lengths of the enlarged cavity 1422 and the extended cavity 1424 along a direction perpendicular to the inner side surface of the metal substrate 130 .

[0171] In one embodiment, the first plastic 110 includes a first groove plastic 1110 and a second groove plastic 1120. The first groove plastic 1110 is filled in the first receiving groove 1412. The second groove plastic 1120 is filled in the second receiving groove 1414, and the second groove plastic 1120 wraps a portion of the second plastic 120.

[0172] In one embodiment, the first plastic 110 further includes a surface plastic 1130 filling the inner side of the metal substrate 130 and covering the first groove plastic 1110 .

[0173] In one embodiment, the metal-plastic composite member 10 is a middle frame and is applied to electronic devices.

[0174] In one embodiment, there are multiple metal substrates 130, which are arranged in a spaced manner, and the corresponding first plastics 110 and surface plastics 1130 are multiple, wherein the multiple surface plastics 1130 are integrally formed. Thus, the multiple metal substrates 130 can form a closed middle frame structure.

[0175] The first groove plastic 1110 , the second groove plastic 1120 , the surface plastic 1130 , and the second plastic 120 may be made of the same material or different materials, such as PE, PP, PVC, ABS, and the like.

[0176] In one embodiment, micro holes are formed on at least one of the inner side surface of the metal substrate 130 and the surface of the receiving groove 1410 , and at least one of the outer side surface of the metal substrate 130 and the surface of the receiving space 1420 is a smooth surface.

[0177] Specifically, the micro-holes can allow plastic to be injected into the micro-holes, thereby improving the bonding strength between the metal substrate 130 and the plastic. Preferably, the micro-holes have a hole diameter of 30 μm to 80 μm and a hole depth of 30 μm to 80 μm. The roughness of the smooth surface is less than Ra0.8.

[0178] The present application further provides a housing (not shown) comprising the metal-plastic composite part 10 described in any one of the above embodiments.

[0179] The present application also provides an electronic device (not shown), comprising the above-mentioned housing. The electronic device may be a mobile phone, a tablet computer, etc.

[0180] The above-mentioned processing and manufacturing method of the metal-plastic composite, the metal-plastic composite 10, the housing and the electronic device form the metal-plastic composite 10 by performing secondary injection molding on the metal substrate 130. The first injection molding forms the first plastic 110 on the metal substrate 130 to improve the strength of the metal substrate 130 and prevent the pressure of the second injection molding from deforming the metal substrate 130; the metal substrate 130 after the first injection molding is expanded to remove part of the deformed part, and the second injection molding is performed to form the second plastic 120 on the metal substrate 130, so as to enhance the stability of the combination of plastic and metal, improve the overall quality of the metal-plastic composite 10, and reduce the probability of seeing the deformation of the metal substrate 130 from the appearance, so as to enhance the user's good physical experience of the metal-plastic composite 10. In addition, the above-mentioned manufacturing method of the metal-plastic composite is simple, highly operable, convenient for large-scale production, and improves the processing efficiency of the metal-plastic composite 10.

[0181] It is obvious to those skilled in the art that the present application is not limited to the details of the exemplary embodiments described above, and that the present application can be implemented in other specific forms without departing from the spirit or essential features of the present application. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive, and the scope of the present application is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the present application.

[0182] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present application and are not intended to limit it. Although the present application has been described in detail with reference to the preferred embodiments, a person of ordinary skill in the art should understand that the technical solution of the present application may be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the present application.

Claims

1. A method for manufacturing a metal-plastic composite part, wherein the metal-plastic composite part is applied to electronic devices, including mobile phones and tablet computers, characterized in that: The method for manufacturing the metal-plastic composite part comprises the following steps: A metal substrate with a receiving hole is formed, wherein the receiving hole includes a communicating receiving groove and a through hole, the receiving hole passes through two opposite side surfaces of the metal substrate, the receiving groove includes a first receiving groove and a second receiving groove; the metal substrate includes a first metal substrate and a second metal substrate, and the step of forming the metal substrate with the receiving groove includes: using a first tool to process the first receiving groove on the inner side surfaces of the first metal substrate and the second metal substrate respectively; using a second tool to further process the second receiving groove at the bottom of the first receiving groove and make the inner angle of the second receiving groove an arc chamfer; the first metal substrate and the second metal substrate are spaced to form the through hole; Etching the metal substrate to form micro holes on the inner side surface, the outer side surface and the surface of the receiving hole of the metal substrate; Injecting a first plastic onto the inner side of the metal substrate to form a metal-plastic blank, wherein the receiving hole is filled with the first plastic, and the first plastic includes a first slot plastic and a second slot plastic respectively filled in the first receiving slot and the second receiving slot; The accommodating hole and the first plastic are processed by a tool to expand the through hole and remove part of the first plastic to form an accommodating space, wherein the surface of the accommodating space is a smooth surface, and the accommodating space includes an enlarged cavity and an extended cavity that are connected, and the inner angle of the extended cavity is a circular arc chamfer; Injecting a second plastic into the metal-plastic blank to form a metal-plastic composite, wherein the enlarged cavity and the extended cavity are filled with the second plastic so that the second plastic is embedded in the first plastic, and the first plastic and the second plastic are made of different materials; wherein the second plastic includes an enlarged plastic and an extended plastic, and the extended plastic passes through the second groove plastic and is partially embedded in the first groove plastic; The outer side surface of the metal-plastic composite is milled by a tool to remove micro holes on the outer side surface of the metal substrate and part of the second plastic, so that the surfaces of the metal substrate and the second plastic are smooth.

2. The method for manufacturing a metal-plastic composite part according to claim 1, characterized in that: The first plastic also includes a hole plastic, and the step of injecting the first plastic into the inner side of the metal substrate to form a metal plastic blank includes: placing the metal substrate in a mold; The molds are closed, and the first groove plastic, the second groove plastic, and the hole plastic are respectively injected into the first containing groove, the second containing groove, and the through hole to form the metal plastic blank.

3. The method for manufacturing a metal-plastic composite part according to claim 2, characterized in that: The first plastic also includes surface plastic, and the step of injecting the first plastic into the inner side of the metal substrate to form a metal-plastic blank also includes: A surface plastic is injected onto the inner side of the metal substrate, and the surface plastic covers the first groove plastic in the first containing groove.

4. The method for manufacturing a metal-plastic composite part according to claim 3, characterized in that: The step of using a tool to process the through hole and the first plastic to expand the through hole and remove part of the first plastic to form an accommodating space includes: Using the tool to expand the through hole to remove the hole plastic in the through hole and form the expanded cavity, wherein the cross-sectional area of ​​the expanded cavity is larger than the cross-sectional area of ​​the through hole; Based on the enlarged cavity, the tool is used to mill in the direction of the receiving groove to remove part of the second groove plastic in the receiving groove and form the extended cavity.

5. The method for manufacturing a metal-plastic composite part according to claim 4, characterized in that: The second plastic includes expanded plastic and extended plastic, and the step of injecting the second plastic into the metal-plastic blank to form the metal-plastic composite part includes: Placing the metal-plastic blank in a mold; The molds are closed, and the enlarged plastic and the extended plastic are respectively injected into the enlarged cavity and the extended cavity to form a metal-plastic composite part.

6. A metal-plastic composite part, obtained by the method for manufacturing a metal-plastic composite part according to any one of claims 1 to 5, and applied to electronic devices, wherein the electronic devices include mobile phones and tablet computers, characterized in that: The metal-plastic composite part comprises: The first plastic has an extension cavity, and the inner corner of the extension cavity is a circular chamfer; A second plastic is at least partially embedded in the extension cavity by injection molding; The metal substrate is provided with a through hole communicating with the extension cavity, the through hole penetrates two opposite sides of the metal substrate, the first plastic and the second plastic are filled in the through hole by injection molding, and the first plastic and the second plastic are made of different materials; wherein, The through hole includes a communicating receiving groove and receiving space, the receiving groove is formed on the inner side of the metal substrate and is used to receive the first plastic, the surface of the receiving groove is formed with micro holes, the receiving space is formed on the outer side of the metal substrate and is used to receive the second plastic, the surface of the receiving space is a smooth surface, and the extension cavity is formed in the receiving space; The containing groove comprises a first containing groove and a second containing groove, the first containing groove is formed on the inner side of the metal substrate, the second containing groove is formed on the bottom of the first containing groove and communicates with the containing space, and the cross-sectional area of ​​the first containing groove is larger than that of the second containing groove; The second containing groove comprises a side wall and a bottom wall, the side wall is connected to the first containing groove, and a circular arc chamfer is formed at the connection between the bottom wall and the side wall.

7. The metal-plastic composite part according to claim 6, characterized in that: The accommodating space includes: The enlarged cavity is opened on the outer side of the metal substrate; wherein, The extension cavity is communicated with the enlarged cavity and extends from the enlarged cavity to the second containing groove.

8. The metal-plastic composite member according to claim 7, wherein the thickness D of the metal substrate satisfies: 0.8 mm < D < 1.9 mm, the depth H1 of the accommodation groove satisfies: 0.3 mm < H1 < 1 mm, and the depth H2 of the accommodation space satisfies: 0.5 mm ≤ H2 ≤ 0.9 mm.

9. The metal-plastic composite part according to claim 8, characterized in that: The depth H of the enlarged cavity 21 Satisfy: 0.3mm≤H 21 ≤0.5mm, the depth H of the extension cavity 22 Satisfy: 0.2mm≤H 22 ≤0.4mm.

10. The metal-plastic composite part according to claim 6, characterized in that: The first plastic comprises: The first groove plastic is filled in the first containing groove; The second groove plastic is filled in the second containing groove.

11. The metal-plastic composite part according to claim 10, characterized in that: The first plastic also includes surface plastic, which fills the inner side of the metal substrate and covers the first groove plastic.

12. The metal-plastic composite part according to claim 11, characterized in that: There are a plurality of metal substrates, and the plurality of metal substrates are arranged in a spaced-apart manner. There are a plurality of corresponding first plastics and surface plastics, and the plurality of surface plastics are integrally formed.

13. The metal-plastic composite part according to claim 6, characterized in that: The roughness range of at least one of the inner side surface of the metal substrate and the surface of the containing groove is Ra10-30, and the roughness range of at least one of the outer side surface of the metal substrate and the surface of the containing space is Ra0.5-1.

6.

14. The metal-plastic composite part according to claim 6, characterized in that: The first plastic is at least partially embedded in the second plastic, or the second plastic is at least partially embedded in the first plastic, or the first plastic and the second plastic are mutually embedded.

15. A housing, characterized in that: The invention comprises the metal-plastic composite part as claimed in any one of claims 6 to 14.

16. An electronic device, characterized in that: Comprising a housing as claimed in claim 15.

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