Glue injection forming die for isolating bar of metal shell

Abstract

The utility model belongs to the technical field of molds, and particularly relates to a glue injection forming mold for an isolating bar of a metal shell. The defects of unreasonable design and the like in the prior art are overcome. According to the isolating bar glue injection forming die of the metal shell, at least one groove body is reserved in the side wall and / or the bottom face of the metal shell, and the forming die comprises a first die which is matched with at least part of the outer surface of the metal shell in a sealing mode and seals an outer groove opening of the groove body; the second mold is matched with at least part of the inner surface of the inner surface of the metal shell in a sealing manner and is used for sealing the inner notch of the groove body; the first mold and the second mold are closed and press the metal shell to form a mold cavity which is at least used for accommodating the section, provided with the groove body, of the metal shell and can mold an antenna isolating bar in the groove body, and the first mold or the second mold is provided with glue injection ports which are communicated with the mold cavity one by one. The method has the advantages of reducing the cost and ensuring the forming quality.

Description

Technical Field

[0001] The utility model belongs to the technical field of molds, and in particular relates to a glue injection molding mold for an isolation strip of a metal shell. Background Art

[0002] At present, with the rapid development of mobile communication technology, smart phones / smart watches / smart speakers / tablets / IOT products, etc., have become indispensable communication tools in people's lives. Antennas, as an important component of these smart products, have a great impact on their performance. With the coming of the 5G era, antennas not only need to cover more frequency bands, but people also expect them to have a smaller size. Therefore, antennas are developing towards miniaturization, multi-frequency, and broadband. The performance requirements for antennas are higher.

[0003] Smart product structural parts formed by metal frames supplemented with surface treatment methods such as anodizing or physical vapor deposition are popular among consumers for their beautiful appearance, solid structure, and excellent aging resistance. They are a trend of the times, but they also bring greater challenges to antenna design.

[0004] Traditional antennas radiate through a metal frame and a gap between the metal frame and a dielectric substrate, and the process of forming this dielectric gap is usually achieved by using a resin injection molding process.

[0005] Taking tablet computers as an example, the typical process flow chart is as follows:

[0006] CNC machining roughing + surface treatment roughening + injection molding + CNC machining Al + PBT) + sand blasting + anode.

[0007] For example, CN109688754A discloses a metal middle frame and a metal middle frame processing method, wherein the metal middle frame includes: a metal frame, a metal middle plate installed on the metal frame, and an injection molding plastic ring between the metal frame and the metal middle plate. The metal frame is provided with an annular receiving flange and a plurality of antenna slots, the receiving flange is provided with a chamfered surface inclined at a preset angle, and the injection molding plastic ring is provided with a plurality of filling blocks for filling the antenna slots. The metal middle frame processing method includes obtaining a metal frame profile and a metal middle plate; installing the metal middle plate on the metal frame profile to obtain a combined profile; performing injection molding on the combined profile to obtain an injection molding profile; performing CNC machine tool processing on the injection molding profile to obtain the metal middle frame shape; performing CNC machine tool processing on the metal middle frame shape to obtain a receiving flange, and processing the chamfered surface on the receiving flange to obtain the metal middle frame; performing anodizing coloring on the metal middle frame.

[0008] For example, CN114290609A discloses a high-strength wear-resistant aluminum mobile phone middle frame and its processing technology. The process includes the following steps: Step 1: melt the aluminum alloy raw material, die-cast, forge, CNC rough milling and grinding to obtain aluminum mobile phone middle frame A; Step 2: subject the aluminum mobile phone middle frame A to surface treatment by alkali washing, acid washing, ultrasonic hot water treatment in sequence; nano injection molding, annealing; CNC fine milling; obtain aluminum mobile phone middle frame B; Step 3: place the aluminum mobile phone middle frame B in an electrolyte for hard anodizing; surface sealing; obtain a high-strength wear-resistant aluminum mobile phone middle frame.

[0009] However, the current in-mold injection molding process used in the injection molding process still has the following defects:

[0010] Injection molding is to implant the entire metal frame into an injection mold, which has high mold costs. At the same time, the injection molding part of the existing injection mold needs to be heated, and the metal frame implanted in the injection mold is easily deformed by heat, affecting the quality of the final product. Utility Model Content

[0011] The purpose of the utility model is to provide a glue injection molding die for the isolation strip of a metal shell which can solve the above technical problems.

[0012] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0013] The isolation strip injection molding die of the metal shell has at least one groove reserved on the side wall and / or bottom surface of the metal shell, and the molding die includes a first mold that seals and matches at least a portion of the outer surface of the metal shell and closes the outer groove of the groove, and also includes a second mold that seals and matches at least a portion of the inner surface of the metal shell and closes the inner groove of the groove. After the first mold and the second mold are combined and the metal shell is pressed, a mold cavity is formed to accommodate at least a section of the metal shell provided with the groove and an antenna isolation strip can be molded in the groove, and a glue injection port that is connected one-to-one with the mold cavity is provided on the first mold or the second mold.

[0014] In the above-mentioned metal shell isolation strip injection molding die, the first die and the second die are combined to form a plurality of mutually independent die cavities.

[0015] In the above-mentioned metal shell isolation strip injection molding die, the first die includes at least one first profiling module having an outer surface sealingly matched with the metal shell having the groove section, and the first profiling module is fixed to the first positioning plate.

[0016] In the above-mentioned metal shell isolation strip injection molding die, the first profiling module has an outer wall profiling sealing surface that seals and matches the outer wall surface of the metal shell, and an outer bottom surface profiling sealing surface that seals and matches the bottom surface of the metal shell.

[0017] In the above-mentioned metal shell isolation strip injection molding die, the first profiling module closes the outer notches of a plurality of the slot bodies disposed on the same side of the metal shell.

[0018] In the above-mentioned metal shell isolation strip injection molding mold, the second mold includes at least one second profiling module having a sealing match with at least a portion of the inner surface of a section of the inner surface of the groove body of the metal shell, and the second profiling module is fixed on the second positioning plate.

[0019] In the above-mentioned metal shell isolation strip injection molding die, the second profiling module closes the inner notches of a plurality of the slot bodies disposed on the same side of the metal shell.

[0020] In the above-mentioned metal shell isolation strip injection molding die, the second profiling module has an inner bottom profiling sealing surface that seals with the inner bottom surface of the metal shell, and also has an inner wall profiling sealing surface that seals with at least part of the inner wall surface of the metal shell.

[0021] In the above-mentioned metal shell isolation strip injection molding die, the second profiling module also has an end face profiling sealing surface that is sealed and matched with the shell opening end face of the metal shell.

[0022] In the above-mentioned metal shell isolation strip injection molding die, the first die and the second die are connected in relative sliding manner via a guide assembly.

[0023] Compared with the existing technology, the advantages of this application are:

[0024] The glue injection and curing method abandons the traditional injection molding method. The metal shell is cured and molded at low temperature (usually room temperature 10-40℃) and low pressure (vacuum + extremely low injection pressure), which causes little damage to the delicate structure and no interface stratification caused by CTE mismatch due to thermal expansion and contraction. This can ensure the product consistency of the metal shell and also meet the terminal's quality requirements for the product.

[0025] Secondly, the embodiment uses a method in which a partial segment enters the molding die, which can significantly reduce the mold development and design costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a three-dimensional structural schematic diagram of a glue injection molding die for an isolation strip of a metal shell provided by the utility model.

[0027] Figure 2The utility model is a schematic cross-sectional structure diagram of a glue injection molding die for an isolation strip of a metal shell.

[0028] Figure 3 yes Figure 2 A in the figure is an enlarged structural diagram.

[0029] Figure 4 It is a schematic diagram of the three-dimensional structure of the first mold provided by the utility model.

[0030] Figure 5 It is a schematic diagram of the three-dimensional structure of the second mold provided by the utility model.

[0031] In the figure, the first mold 1, the first profiling module 10, the outer wall profiling sealing surface 100, the outer bottom surface profiling sealing surface 110, the first positioning plate 11, the metal shell 2, the groove body 20, the outer notch 200, the inner notch 210, the second mold 3, the second profiling module 30, the inner bottom surface profiling sealing surface 300, the inner wall surface profiling sealing surface 310, the end surface profiling sealing surface 320, the second positioning plate 31, the glue injection port 4, and the guide assembly 5. DETAILED DESCRIPTION

[0032] The following are specific embodiments of the utility model and the accompanying drawings to further describe the technical solution of the utility model, but the utility model is not limited to these embodiments.

[0033] like Figure 1 As shown, this embodiment provides a metal shell, and at least one groove 20 is reserved on the side wall and / or bottom surface of the metal shell 2;

[0034] The metal shell 2 is anodized to form a porous layer;

[0035] An antenna isolation strip is solidified and embedded in the slot body 20;

[0036] The antenna isolation strip is formed by filling and curing with glue at room temperature;

[0037] The glue is cured and bonded to the porous layer during curing and molding.

[0038] In this embodiment, the normal temperature is 10-40°C.

[0039] In this embodiment, the metal shell can be selected as a tablet computer metal shell, a mobile phone metal shell, a smart watch metal shell, a display metal shell, or other metal shells with relevant structural requirements according to the final product category.

[0040] Specifically, the curing molding of the antenna isolation strip adopts the following mold molding:

[0041] like Figure 1 , Figure 2 and Figure 3As shown, the metal shell's isolation strip injection molding mold includes a first mold 1 that seals and matches at least a portion of the outer surface of the metal shell 2 and closes the outer slot 200 of the slot body 20, and also includes a second mold 3 that seals and matches at least a portion of the inner surface of the metal shell 2 and closes the inner slot 210 of the slot body 20. After the first mold 1 and the second mold 3 are combined and pressed against the metal shell 2, a mold cavity is formed that can accommodate at least a section of the metal shell 2 with the slot body 20 and can form an antenna isolation strip in the slot body 20. A glue injection port 4 that is connected one-to-one with the mold cavity is provided on the first mold 1 or the second mold 3.

[0042] This application adopts a glue injection and curing method, which abandons the traditional injection molding method, can ensure the product consistency of the metal shell, and also meet the terminal's quality requirements for the product.

[0043] Secondly, the embodiment uses a method in which a partial segment enters the molding die, which can significantly reduce the mold development and design costs.

[0044] For example, the first mold 1 of this embodiment is set as the lower mold, and the second mold 3 can be set as the upper mold, and the glue injection port 4 is set in the upper mold. The descent of the upper mold makes the upper mold and the lower mold close together. After the close mold is in place, the metal shell 2 is pressed down. That is, the mold cavity is formed by combining the second mold 3, the first mold 1 and the metal shell 2 of the antenna isolation strip to be formed. Glue is injected into the mold cavity, and then the antenna isolation strip is formed through curing molding and demolding. The second mold 3 rises and falls in the Z-axis direction to achieve or cancel the close mold with the first mold 1.

[0045] Secondly, the first die 1 and the second die 3 are connected in relative sliding manner via a guide assembly 5. The guide assembly 5 is, for example, a matching mode of a guide post and a guide sleeve, so that the relative movement of the first die 1 and the second die 3 is in linear movement.

[0046] The glue comprises an adhesive and a dielectric material, and the dielectric constant of the adhesive is greater than the dielectric constant of the dielectric material.

[0047] In this embodiment, activation is performed before the glue is injected into the mold cavity.

[0048] The activation includes using plasma to activate the injection slots;

[0049] Among them, the gas pressure for forming plasma during the activation is controlled to be 0.1-10Pa, for example, it can be 0.1Pa, 0.2Pa, 0.4Pa, 0.6Pa, 0.8Pa, 1Pa, 2Pa, 4Pa, 6Pa, 8Pa or 10Pa, etc., but is not limited to the listed values, and other values ​​not listed within this range also meet the requirements.

[0050] Among them, the absolute vacuum degree of the operation in the activation is 0.0007-0.5Pa, for example, it can be 0.0007Pa, 0.0008Pa, 0.0009Pa, 0.001Pa, 0.005Pa, 0.01Pa, 0.02Pa, 0.04Pa, 0.06Pa, 0.08Pa, 0.1Pa, 0.2Pa, 0.3Pa, 0.4Pa or 0.5Pa, but is not limited to the listed values, and other values ​​not listed in this range also meet the requirements.

[0051] The activation time is 0.1-1s, for example, 0.1s, 0.2s, 0.4s, 0.6s, 0.8s or 1s, etc., but is not limited to the listed values, and other values ​​not listed within the range also meet the requirements.

[0052] Among them, the width of the antenna isolation strip is 0.5-2mm, for example, it can be 0.5mm, 1mm, 1.5mm or 2mm, but it is not limited to the listed values. Other values ​​not listed in this range also meet the requirements.

[0053] The antenna isolation strips are distributed along the inner wall of the metal shell 2 to form internal support.

[0054] In this embodiment, the width of the antenna isolation strip is the width of the groove set in the metal shell 2. When the antenna isolation strip is distributed along the inner wall of the metal shell 2 to form an internal support, the size of the solidified antenna isolation strip formed on the inner wall of the metal shell 2 is reasonably designed according to the components to be arranged inside the metal shell 2. Specifically, the size of the antenna isolation strip inside the metal shell 2 is set according to the shape of the electronic main board, antenna, lens module, battery module, etc. configured inside the metal shell 2.

[0055] In this embodiment, the interior of the metal shell 2 is a space for accommodating electronic components after the finished electronic product is formed.

[0056] The groove body is a through groove that penetrates the wall thickness of the metal shell 2 .

[0057] Furthermore, the grooves are arranged in parallel in at least two groups, and the spacing between adjacent grooves is 0.3-0.5 mm, for example, it can be 0.3 mm, 0.35 mm, 0.4 mm, 0.45 mm or 0.5 mm, but is not limited to the listed values, and other values ​​not listed in this range also meet the requirements.

[0058] Among them, when the slots are arranged in parallel in at least two groups, the width of the antenna isolation strip is 0.3-0.4mm, for example, it can be 0.3mm, 0.32mm, 0.34mm, 0.36mm, 0.38mm or 0.4mm, etc., but is not limited to the listed values, and other unlisted values ​​within the range also meet the requirements.

[0059] The glue comprises, by mass percentage, 30-40% of polybutylene terephthalate material, 20-30% of polycarbonate material, 5-35% of dielectric material, and 10-45% of adhesive.

[0060] In this embodiment, the mass percentage of polybutylene terephthalate material in the antenna protection isolation material is 30-40%, for example, it can be 30%, 31%, 32%, 33%, 34%, 35%, 36%, 37%, 38%, 39% or 40%, etc., but is not limited to the listed values, and other unlisted values ​​within this range also meet the requirements.

[0061] In this embodiment, the mass percentage of the polycarbonate material in the antenna protection isolation material is 20-30%, for example, it can be 20%, 21%, 22%, 23%, 24%, 25%, 26%, 27%, 28%, 29% or 30%, etc., but is not limited to the listed values, and other unlisted values ​​within the range also meet the requirements.

[0062] In this embodiment, the mass percentage of the dielectric material in the antenna protection isolation material is 5-35%, for example, it can be 5%, 6%, 8%, 10%, 12%, 14%, 16%, 18%, 20%, 22%, 24%, 26%, 28%, 30%, 32%, 34% or 35%, etc., but is not limited to the listed values, and other values ​​not listed within the range also meet the requirements.

[0063] In this embodiment, the mass percentage of the adhesive in the antenna protection isolation material is 10-45%, for example, it can be 10%, 12%, 14%, 16%, 18%, 20%, 22%, 24%, 26%, 28%, 30%, 32%, 34%, 36%, 38%, 40%, 42%, 44% or 45%, etc., but is not limited to the listed values, and other values ​​not listed within the range also meet the requirements.

[0064] In this embodiment, the total content of polybutylene terephthalate material, polycarbonate material, dielectric material and adhesive in the antenna protection isolation material is 100%.

[0065] Specifically, the polybutylene terephthalate material is glass fiber reinforced polybutylene terephthalate, and the glass fiber content is 30-35% by mass, for example, it can be 30%, 30.5%, 31%, 31.5%, 32%, 32.5%, 33%, 33.5%, 34%, 34.5% or 35%, etc., but is not limited to the listed values, and other values ​​not listed within the range also meet the requirements.

[0066] Specifically, the polycarbonate material is glass fiber reinforced polycarbonate, and the glass fiber content is 20-40% by mass, for example, it can be 20%, 22%, 24%, 26%, 28%, 30%, 32%, 34%, 36%, 38% or 40%, etc., but is not limited to the listed values, and other unlisted values ​​within the range also meet the requirements.

[0067] Specifically, the dielectric material includes a combination of polytetrafluoroethylene and auxiliary materials or polytetrafluoroethylene.

[0068] Wherein, the auxiliary material includes any one or a combination of at least two of polypropylene, poly(4-methyl-1-pentene) or a terpolymer of acrylonitrile (A)-butadiene (B)-styrene (S).

[0069] When the dielectric material is polytetrafluoroethylene, the mass percentage of the dielectric material is 10-20%, for example, it can be 10%, 12%, 14%, 16%, 18% or 20%, etc., but is not limited to the listed values, and other values ​​not listed within the range also meet the requirements.

[0070] Among them, when the dielectric material is a combination of polytetrafluoroethylene and auxiliary materials, the mass percentage of polytetrafluoroethylene accounts for 8-10% of the antenna protection isolation material, for example, it can be 8%, 8.5%, 9%, 9.5% or 10%, etc., but is not limited to the listed values, and other unlisted values ​​within this range also meet the requirements.

[0071] Specifically, the dielectric constant of the dielectric material is 1-3, for example, it can be 1, 1.2, 1.4, 1.6, 1.8, 2, 2.2, 2.4, 2.6, 2.8 or 3, but is not limited to the listed values, and other unlisted values ​​within the range also meet the requirements.

[0072] Specifically, the adhesive includes one or a combination of at least two of epoxy resin adhesive, acrylic adhesive or polymethyl methacrylate adhesive.

[0073] In this embodiment, the adhesive used can be selected from a limited commercially available light-curing adhesive or a heat-curing adhesive; or a limited type of adhesive synthesized using existing technology can be selected.

[0074] Specifically, the antenna protection isolation material also includes pigment.

[0075] The pigment includes one or a combination of at least two of red pigment, yellow pigment or blue pigment.

[0076] Wherein, the red pigment comprises one or a combination of at least one of iron red pigment, red powder pigment or transparent red pigment.

[0077] Wherein, the yellow pigment includes lead chrome yellow pigment and / or iron yellow pigment.

[0078] Wherein, the blue pigment includes phthalocyanine blue pigment and / or ultramarine pigment.

[0079] In this embodiment, the amount of pigment added is reasonably selected based on the depth and type of color required for the design. The specific pigment color configuration is formulated and designed based on the three primary colors, without specific restrictions. For example, when the color of the metal shell 2 product is black, the antenna protection isolation material is designed to be black using pigment. When the color of the metal shell 2 product is white, the antenna protection isolation material is designed to be white using pigment. When the color of the metal shell 2 product is blue, the antenna protection isolation material is designed to be blue using pigment, and so on.

[0080] In this embodiment, the mold cavity formed during the molding process can be designed according to the actual required shape, and the second mold 3 and the first mold 1 used are designed according to the shapes of the metal shell 2 and the antenna protection isolation material to ensure that the required shape of the antenna protection isolation material is achieved.

[0081] In this embodiment, the glue is prepared by mixing polybutylene terephthalate material, polycarbonate material, dielectric material and adhesive, and then curing to obtain the antenna protection isolation material.

[0082] In this embodiment, the curing method is selected according to the type of adhesive. When the adhesive is a light-curing adhesive, light curing, such as infrared light curing and ultraviolet light curing, is used as the curing method; if the adhesive is a heat-curing adhesive, heat curing can be used.

[0083] Secondly, the first mold 1 and the second mold 3 are combined to form a plurality of mutually independent mold cavities. The number of mold cavities depends on the number of slots 20, that is, the number of slots 20 is equal to the number of mold cavities.

[0084] Specifically, Figure 3-Figure 5 As shown, the first mold 1 of this embodiment includes at least one first profiling module 10 having an outer surface that is sealed and matched with a section of the metal shell 2 having a groove body 20. The first profiling module 10 is fixed on the first positioning plate 11, and the bottom surface of the metal shell 2 that does not match the first profiling module 10 can be suspended or suspended. The shape of the first profiling module 10 is similar to the shape of the outer surface of the metal shell 2 having a section of the groove body 20, so as to seal and position the metal shell 2. The first profiling module 10 has an outer wall profiling sealing surface 100 that is sealed and matched with the outer wall surface of the metal shell 2, and an outer bottom surface profiling sealing surface 110 that is sealed and matched with the bottom surface of the metal shell 2. The outer wall profiling sealing surface 100 and the outer bottom surface profiling sealing surface 110 are connected by an outer arc convex surface to facilitate demoulding.

[0085] When the same side of the metal shell 2 has multiple slots 20, the first profiling module 10 of this embodiment closes the outer slots 200 of the slots 20 disposed on the same side of the metal shell 2. The outer slots 200 here include the outer slots 200 of the outer wall and the outer slots 200 of the bottom surface.

[0086] Specifically, the second mold 3 of this embodiment includes at least one second profiling module 30 having a sealing match with at least a portion of the inner surface of the metal shell 2 having the slot body 20, and the second profiling module 30 is fixed on the second positioning plate 31. And when there are multiple slot bodies 20 on the same side of the metal shell 2, the second profiling module 30 closes the inner notches 210 of the multiple slot bodies 20 on the same side of the metal shell 2. The inner notches 210 here are the inner notches 210 facing the shell end surface 21 and the inner notches 210 facing the inner wall of the metal shell 2.

[0087] Meanwhile, the second profiling module 30 has an inner bottom profiling sealing surface 300 that is sealed and matched with the inner bottom surface of the metal shell 2, and an inner wall profiling sealing surface 310 that is sealed and matched with at least a portion of the inner wall surface of the metal shell 2. The second profiling module 30 also has an end face profiling sealing surface 320 that is sealed and matched with the shell port end face 21 of the metal shell 2.

[0088] Through the above-mentioned sealing surface design, the mold cavity can be formed into a leak-proof sealing state, and there is no leakage after the glue is injected.

[0089] Example 1

[0090] This embodiment provides a PAD metal shell 2, and the specific preparation process is as follows:

[0091] The metal shell 2 is processed to form a slot for filling the antenna isolation strip, wherein the slot is a through slot that penetrates the wall thickness of the metal shell 2. The processed metal shell 2 is anodized and the slot is activated; the activation includes using plasma to activate the injection slot, the gas pressure of the plasma formed during the activation is controlled to be 5Pa, the absolute vacuum degree of the operation during the activation is 0.01Pa, and the activation time is 0.5s;

[0092] Construct a mold cavity, cover the trough body with a glass cover plate, and combine the glass cover plate and the metal shell 2 to form a closed cavity. Transparent silicone is formed on the glass cover plate by LSR process. The glass cover plate and the metal shell 2 are fastened and sealed by the second mold 3 and the first mold 1. The metal shell of the antenna isolation strip to be formed is combined to form a mold cavity, and a glue injection port 4 is reserved in the mold cavity;

[0093] The glue is injected into the mold cavity, and then the antenna spacer is formed through curing and demoulding;

[0094] Glue includes by mass percentage:

[0095] Polybutylene terephthalate material 30%, polycarbonate material 20%, polytetrafluoroethylene 10%, adhesive 40%;

[0096] The dielectric constant of the adhesive is greater than the dielectric constant of the dielectric material;

[0097] The polybutylene terephthalate material is glass fiber reinforced polybutylene terephthalate, and the glass fiber content is 30% by mass;

[0098] The polycarbonate material is glass fiber reinforced polycarbonate, and the glass fiber content is 25% by mass;

[0099] The dielectric constant of the dielectric material is 2;

[0100] The adhesive is a heat-curing adhesive, which is a commercially available LOCTITE-H205-5 heat-curing resin, and is cured at 150°C for 60 minutes;

[0101] The glue is added with a pigment having the same color as the metal shell 2 .

[0102] The curing method is thermal curing.

[0103] The width of the obtained antenna isolation strip is 2 mm, and the antenna isolation strip is distributed along the inner wall of the metal shell 2 to form an internal support. The obtained metal shell 2 can avoid cracking, acid spitting, and white line defects when further anodized.

[0104] Example 2

[0105] This embodiment provides a metal housing 2 of a mobile phone, and the specific preparation process is as follows:

[0106] The metal shell 2 is processed to set a slot body for filling the antenna isolation strip. The slot body is a through slot that penetrates the wall thickness of the metal shell 2. Two groups of slot bodies are arranged in parallel, and the spacing between adjacent slot bodies is 0.4 mm. The processed metal shell 2 is anodized and the slot body is activated; the activation includes using plasma to activate the injection slot position, the gas pressure of the plasma formed during the activation is controlled to be 0.1 Pa, the absolute vacuum degree of the operation during the activation is 0.0007 Pa, and the activation time is 0.1 s;

[0107] Construct a mold cavity, cover the groove body with a glass cover plate, and combine the glass cover plate and the metal shell 2 to form a closed cavity. Transparent silicone is formed on the glass cover plate by LSR process. The glass cover plate and the metal shell 2 are fastened and sealed by the second mold 3 and the first mold 1. The metal shell 2 of the antenna isolation strip to be formed is combined to form a mold cavity, and a glue injection port 4 is reserved in the mold cavity;

[0108] The glue is injected into the mold cavity, and then the antenna spacer is formed through curing and demoulding;

[0109] Glue includes by mass percentage:

[0110] Polybutylene terephthalate material 40%, polycarbonate material 30%, polytetrafluoroethylene 20%, adhesive 10%;

[0111] The dielectric constant of the adhesive is greater than the dielectric constant of the dielectric material;

[0112] The polybutylene terephthalate material is glass fiber reinforced polybutylene terephthalate, and the glass fiber content is 35% by mass;

[0113] The polycarbonate material is glass fiber reinforced polycarbonate, and the glass fiber content is 20% by mass;

[0114] The dielectric constant of the dielectric material is 1;

[0115] The adhesive is a heat-curing adhesive, which is a commercially available LOCTITE-361AB heat-curing resin, and is cured at 80°C for 30 minutes;

[0116] The glue is also added with a pigment having the same color as the metal shell 2 .

[0117] The curing method is thermal curing.

[0118] The width of the obtained antenna isolation strip is 0.3 mm. The antenna isolation strip is distributed along the inner wall of the metal shell 2 to form an internal support. The obtained metal shell 2 can avoid cracking, acid spitting, and white line defects when further anodized.

[0119] Example 3

[0120] This embodiment provides a metal housing 2 of a mobile phone, and the specific preparation process is as follows:

[0121] The metal shell 2 is processed to form a slot for filling the antenna isolation strip, wherein the slot is a through slot that penetrates the wall thickness of the metal shell 2. The processed metal shell 2 is anodized and the slot is activated; the activation includes using plasma to activate the injection slot, the gas pressure of the plasma formed during the activation is controlled to be 10Pa, the absolute vacuum degree of the operation during the activation is 0.5Pa, and the activation time is 1s;

[0122] Construct a mold cavity, cover the groove body with a glass cover plate, and combine the glass cover plate and the metal shell 2 to form a closed cavity. Transparent silicone is formed on the glass cover plate by LSR process. The glass cover plate and the metal shell 2 are fastened and sealed by the second mold 3 and the first mold 1. The metal shell 2 of the antenna isolation strip to be formed is combined to form a mold cavity, and a glue injection port 4 is reserved in the mold cavity;

[0123] The glue is injected into the mold cavity, and then the antenna spacer is formed through curing and demoulding;

[0124] Glue includes by mass percentage:

[0125] Polybutylene terephthalate material 35%, polycarbonate material 25%, polytetrafluoroethylene 20%, adhesive 20%;

[0126] The dielectric constant of the adhesive is greater than the dielectric constant of the dielectric material;

[0127] The polybutylene terephthalate material is glass fiber reinforced polybutylene terephthalate, and the glass fiber content is 32% by mass;

[0128] The polycarbonate material is glass fiber reinforced polycarbonate, and the glass fiber content is 40% by mass;

[0129] The dielectric constant of the dielectric material is 3;

[0130] The adhesive is a heat-curing adhesive, which is a commercially available LOCTITE-6104 heat-curing resin, and is cured at 65°C for 60 minutes;

[0131] The glue is also added with a pigment having the same color as the metal shell 2 .

[0132] The curing method is thermal curing.

[0133] The width of the obtained antenna isolation strip is 0.5 mm. The antenna isolation strip is distributed along the inner wall of the metal shell 2 to form an internal support. The obtained metal shell 2 can avoid cracking, acid spitting, and white line defects when further anodized.

[0134] The results of the above embodiments show that the metal shell provided by the utility model forms an antenna with a glue material to improve performance. The specific adhesive uses epoxy resin, acrylic acid, PMMA, etc. as monomers, mixed with particles with a lower dielectric constant (such as PFTE copolymer) to form the appearance of the antenna material (dissolved and blended); at the same time, pigments are used for color adjustment (using the three primary colors of red, yellow, and blue: red pigments are iron red, scarlet pink, and transparent red; yellow pigments are lead chrome yellow and iron yellow; blue pigments are phthalocyanine blue and ultramarine), so that the color of the antenna is consistent with the color of the anodized aluminum shell, forming a uniform appearance; for applications with long sizes and long flow channels, a screw injection molding machine is used to inject glue materials to form an antenna. This solution has a good filling effect on long flow channel high viscosity glue.

[0135] It is stated that the utility model uses the above embodiments to illustrate the detailed structural features of the utility model, but the utility model is not limited to the above detailed structural features, that is, it does not mean that the utility model must rely on the above detailed structural features to be implemented. Those skilled in the art should understand that any improvement to the utility model, equivalent replacement of the components selected by the utility model, addition of auxiliary components, selection of specific methods, etc., all fall within the protection scope and disclosure scope of the utility model.

[0136] The preferred embodiments of the present invention are described in detail above. However, the present invention is not limited to the specific details in the above embodiments. Within the technical concept of the present invention, the technical solution of the present invention can be subjected to a variety of simple modifications, and these simple modifications all belong to the protection scope of the present invention.

[0137] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present utility model will not further describe various possible combinations.

[0138] In addition, various embodiments of the present invention may be arbitrarily combined, and as long as they do not violate the concept of the present invention, they should also be regarded as the contents disclosed by the present invention.

Claims

1. A metal shell isolation strip injection molding die, wherein at least one groove (20) is reserved on the side wall and / or bottom surface of the metal shell (2), characterized in that: The molding die comprises a first die (1) which is sealed to match at least a portion of the outer surface of the metal shell (2) and closes the outer notch (200) of the slot body (20), and a second die (3) which is sealed to match at least a portion of the inner surface of the metal shell (2) and closes the inner notch (210) of the slot body (20). The first die (1) and the second die (3) are combined and pressed against the metal shell (2) to form a mold cavity which can accommodate at least a section of the metal shell (2) provided with the slot body (20) and can mold an antenna isolation strip in the slot body (20). A glue injection port (4) which is in one-to-one communication with the mold cavity is provided on the first die (1) or the second die (3).

2. The metal shell isolation strip injection molding die according to claim 1, characterized in that: After the first mold (1) and the second mold (3) are combined, a plurality of mutually independent mold cavities are formed.

3. The metal shell isolation strip injection molding die according to claim 1, characterized in that: The first mold (1) comprises at least one first profiling module (10) having an outer surface that is sealed and matched with a section of the metal shell (2) provided with the groove body (20), and the first profiling module (10) is fixed on a first positioning plate (11).

4. The plastic injection molding die for the isolation strip of the metal shell according to claim 3, characterized in that: The first profiling module (10) comprises an outer wall profiling sealing surface (100) which is sealingly matched with the outer wall surface of the metal shell (2), and an outer bottom surface profiling sealing surface (110) which is sealingly matched with the bottom surface of the metal shell (2).

5. The adhesive injection molding die for the isolation strip of the metal shell according to claim 3, characterized in that: The first profiling module (10) closes the outer slots (200) of a plurality of slot bodies (20) disposed on the same side of the metal shell (2).

6. The plastic injection molding die for the isolation strip of the metal shell according to claim 1, characterized in that: The second mold (3) comprises at least one second profiling module (30) having a sealing match with at least a portion of the inner surface of the metal shell (2) having the groove body (20) provided thereon, and the second profiling module (30) is fixed on a second positioning plate (31).

7. The plastic injection molding die for the isolation strip of the metal shell according to claim 6, characterized in that: The second profiling module (30) closes the inner slot openings (210) of a plurality of slot bodies (20) disposed on the same side of the metal shell (2).

8. The adhesive injection molding die for the isolation strip of the metal shell according to claim 6, characterized in that: The second profiling module (30) has an inner bottom profiling sealing surface (300) that is seal-matched with the inner bottom surface of the metal shell (2), and also has an inner wall profiling sealing surface (310) that is seal-matched with at least a portion of the inner wall surface of the metal shell (2).

9. The adhesive injection molding die for the isolation strip of the metal shell according to claim 8, characterized in that: The second profiling module (30) also has an end face profiling sealing surface (320) that is sealingly matched with the shell opening end face (21) of the metal shell (2).

10. The plastic injection molding die for the isolation strip of the metal shell according to claim 1, characterized in that: The first mold (1) and the second mold (3) are connected in a relative sliding manner via a guide assembly (5).

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