Glue injection forming die for metal shell decoration strip

Abstract

The utility model belongs to the technical field of molds, and particularly relates to a glue injection forming mold for a metal shell decoration strip. The defects of unreasonable design and the like in the prior art are overcome. According to the glue injection forming die for the decoration strip of the metal shell, a glue injection groove position is formed in the shell opening end face of the metal shell, the glue injection forming die comprises a first die used for positioning the metal shell, and the glue injection forming die further comprises a third die which is matched with the shell opening end face and the peripheral face of the metal shell in a sealed mode; when the third mold and the first mold are assembled in place, the third mold and the glue injection groove position form a decoration strip forming cavity, and at least one glue injection hole body communicated with the decoration strip forming cavity is formed in the third mold. 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 particularly relates to a glue injection molding mold for a metal shell decorative strip. 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. The shells of the above electronic devices are gradually replaced by metal shells, such as aluminum alloy, titanium alloy and other structures. In the design and assembly process, for the use of electronic devices, insulating materials will be set on the metal shell, such as the antenna separation strip on the shell, the decorative strip protection strip between the screen and the metal shell. Traditionally, the corresponding materials are filled in the mold through injection molding and combined with the metal shell to form a decorative strip; there are also PSA glues to bond PU materials to the metal shell. During the bonding process, the long flexible rubber strips are difficult to position and the shape is difficult to maintain. At the same time, the bonding using PSA has poor reliability, and there is often a risk of failure in subsequent aging resistance, high temperature and high humidity / cold and hot shocks, resulting in debonding.

[0003] In addition, the screen protection strips are all black and cannot be changed to other colors, which makes the appearance ugly. Taking a tablet computer as an example, the typical process flow chart is as follows:

[0004] CNC machining roughing + surface treatment roughening + injection molding + CNC machining Al + PBT) + sand blasting + anode.

[0005] Injection molding is located between the metal shell processing and the anode. After injection molding, the gate needs to be processed and cut again by CNC machining, which increases the overall process and reduces efficiency.

[0006] 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.

[0007] For example, CN114290609A discloses a high-strength wear-resistant aluminum mobile phone middle frame and its processing technology. It includes the following steps: Step 1: melt the aluminum alloy raw material, die-cast, forge, CNC rough milling and grinding, to obtain an aluminum mobile phone middle frame A; Step 2: subject the aluminum mobile phone middle frame A to surface treatment by alkali washing, pickling, ultrasonic hot water treatment in sequence; nano injection molding, annealing; CNC fine milling; obtain an 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:

[0008] However, the current injection molding process still has the following defects: injection molding is to implant the entire metal frame into the injection mold, and the mold cost is high; 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

[0009] The purpose of the utility model is to provide a metal shell decorative strip glue injection molding die which can solve the above technical problems.

[0010] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0011] The present metal shell decorative strip glue injection molding mold has a glue injection groove on the shell mouth end face of the metal shell, the glue injection molding mold includes a first mold for positioning the metal shell, and the glue injection molding mold also includes a third mold that is sealed and matched with the shell mouth end face and the outer peripheral surface of the metal shell respectively; when the third mold is molded into place with the first mold, the third mold and the glue injection groove form a decorative strip molding cavity, and at least one glue injection hole body connected to the decorative strip molding cavity is provided on the third mold.

[0012] In the above-mentioned metal shell decorative strip glue injection molding die, the third mold has a glue injection groove body connected to the glue injection groove position, and the glue injection groove position and the glue injection groove body form the decorative strip molding cavity.

[0013] In the above-mentioned metal shell decorative strip injection molding die, the decorative strip molding cavity is annular.

[0014] In the above-mentioned metal shell decorative strip injection molding die, the third die includes a third module having the injection groove body, and the third module has an end face sealing surface that seals with the shell mouth end face, and a circumferential sealing surface that seals with the outer peripheral surface of the metal shell.

[0015] In the above-mentioned metal shell decorative strip injection molding die, the third module further has a matching contact surface that matches with the stop plane of the first die or is spaced parallel to the stop plane of the first die 1 .

[0016] In the above-mentioned metal shell decorative strip injection molding die, the third module is ring-shaped and the third module is fixed on the third positioning plate.

[0017] In the above-mentioned metal shell decorative strip injection molding die, the decorative strip molding cavity is a polygonal cavity, and each side of the decorative strip molding cavity is connected to at least one of the glue injection holes.

[0018] In the above-mentioned glue injection molding die for the metal shell decorative strip, each of the glue injection holes is respectively connected to a glue injection nozzle.

[0019] In the above-mentioned metal shell decorative strip injection molding die, a stepped anti-slip hole is provided on the third die, the injection nozzle is installed in the stepped anti-slip hole, and the injection nozzle has an anti-slip shoulder in the circumference that abuts against the stop surface of the stepped anti-slip hole.

[0020] In the above-mentioned metal shell decorative strip injection molding die, the first die includes at least one first profiling module having a sealing match with the outer surface of the metal shell, and the first profiling module is fixed to the first positioning plate.

[0021] Compared with the existing technology, the advantages of this application are:

[0022] The one-piece injection mold ensures that the product size is controllable and can be molded at room temperature without heat shrinkage problems.

[0023] The mold manufacturing cost is low and the structure is simple. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a three-dimensional structural schematic diagram of a glue injection molding die for a metal shell decorative strip provided by the utility model.

[0025] Figure 2 The utility model is a schematic cross-sectional structure diagram of a glue injection molding die for a metal shell decorative strip provided by the utility model.

[0026] Figure 3 yes Figure 2 A in the figure is an enlarged structural diagram.

[0027] Figure 4 It is a schematic diagram of the three-dimensional structure of the first mold provided by the utility model.

[0028] Figure 5 It is a schematic diagram of the three-dimensional structure of the second mold provided by the utility model.

[0029] Figure 6 It is a three-dimensional structural schematic diagram of a glue injection molding die for a metal shell decorative strip provided by the utility model.

[0030] Figure 7The utility model is a schematic cross-sectional structure diagram of a glue injection molding die for a metal shell decorative strip provided by the utility model.

[0031] Figure 8 yes Figure 7 The enlarged structural diagram at B in FIG.

[0032] 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 shell mouth end face 21, the glue injection slot 22, 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, the guide assembly 5, the third mold 6, the glue injection hole body 60, the glue injection groove body 61, the third module 62, the end surface sealing surface 63, the circumferential sealing surface 64, the matching contact surface 65, the third positioning plate 66, the glue injection nozzle 67, the anti-slip shoulder 670, the stepped anti-slip hole 68, and the decorative strip forming cavity 69. DETAILED DESCRIPTION

[0033] 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.

[0034] like Figure 1 As shown, this embodiment provides a metal shell, and a glue injection groove 22 is provided on the shell opening end surface 21 of the metal shell 2;

[0035] The metal shell 2 is anodized to form a porous layer;

[0036] like Figure 6-Figure 8 As shown, the metal shell decorative strip injection molding die of the present embodiment includes a first die 1 for positioning the metal shell 2, and also includes a third die 6 which is sealed and matched with the shell mouth end face 21 and the outer peripheral surface of the metal shell 2 respectively; when the third die 6 and the first die 1 are molded into place, the third die 6 and the injection groove 22 form a decorative strip molding cavity, and at least one injection hole body 60 connected to the decorative strip molding cavity is provided on the third die 6.

[0037] The third mold 6 is in sealing contact with the outer peripheral surface of the metal shell 2, and the third mold 6 is in sealing contact with the shell end surface 21. At this time, the notch of the injection slot 22 is completely closed, which can ensure the sealing of the injection molding.

[0038] Specifically, the third mold 6 has a glue injection slot body 61 connected to the glue injection slot 22, and the glue injection slot 22 and the glue injection slot body 61 form a decorative strip molding cavity, and the decorative strip molding cavity is annular. The height of the molded decorative strip exceeds the shell end surface 21 to achieve a better sealing effect.

[0039] Furthermore, the third mold 6 includes a third module 62 having a glue injection groove 61, and the third module 62 has an end face sealing surface 63 that is sealed and matched with the shell mouth end face 21, and a circumferential sealing surface 64 that is sealed and matched with the outer peripheral surface of the metal shell 2. In order to make the mold close in place, the third module 62 also has a matching contact surface 65 that matches with the stop plane 12 of the first mold 1 or is spaced and parallel to the stop plane 12 of the first mold 1.

[0040] The matching contact surface 65 can seal the end face sealing surface 63 and the housing opening end face 21 .

[0041] Preferably, the third module 62 of this embodiment is annular, and the third module 62 is fixed on a third positioning plate 66. The third positioning plate 66 provides sufficient strength to make the matching accuracy of the third module 62 and the metal shell 2 higher.

[0042] In addition, the molding cavity of the decorative strip of the present embodiment is a polygonal cavity, and at least one injection hole 60 is connected to each side of the molding cavity. This is to facilitate the uniformity of injection. For example, a glue injection hole 60 is arranged at a corner. And each injection hole 60 is connected to a glue injection nozzle 67. In order to prevent the glue injection nozzle 67 from falling off to the side away from the first mold 1, a stepped anti-slip hole 68 is provided on the third mold 6, and the glue injection nozzle 67 is installed in the stepped anti-slip hole 68, and the circumference of the glue injection nozzle 67 has an anti-slip shoulder 670 that abuts against the stop surface of the stepped anti-slip hole 68.

[0043] The first mold 1 of the metal shell decorative strip injection molding mold and the first mold 1 of the metal shell isolation strip injection molding mold have the same structure and can also be understood as a universal mold. For example, the first mold 1 includes at least one first profiling module 10 that is sealed and matched with the outer surface of the metal shell 2, and the first profiling module 10 is fixed on the first positioning plate 11.

[0044] like Figure 1 , Figure 2 and Figure 3 As shown, at least one groove 20 is reserved on the side wall and / or bottom surface of the metal shell 2 .

[0045] An antenna isolation strip is solidified and embedded in the slot body 20;

[0046] The antenna isolation strip is formed by filling and curing with glue at room temperature;

[0047] The glue is cured and bonded to the porous layer during curing and molding.

[0048] In this embodiment, the normal temperature is 10-40°C.

[0049] 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.

[0050] A metal shell decorative strip forming process, the metal shell decorative strip forming process comprising:

[0051] A metal shell 2 is provided with at least one glue injection slot; the glue injection slot is provided with a third mold 6, which is covered on the metal shell 2 and combined with the glue injection slot to form a cavity, that is, a decorative strip molding cavity, and the third mold 6 is provided with a glue injection hole body 60 and an exhaust hole;

[0052] The metal shell 2 and the third mold 6 are installed in the first mold 1 accordingly, so as to form a decorative strip forming cavity 69 through the combination of the injection slot of the metal shell 2 and the third mold 6;

[0053] Injecting the decorative strip glue into the decorative strip forming cavity 69, followed by curing and demoulding;

[0054] The injection pressure of the decorative strip glue during injection is less than 0.6 MPa; the decorative strip glue comprises butylene terephthalate material, polycarbonate material and adhesive.

[0055] In this embodiment, the first mold 1 has a structure as follows: Figure 1 , Figure 2 and Figure 3 shown.

[0056] In this embodiment, the material of the metal shell 2 is selected according to actual needs, and common metal materials such as aluminum alloy, stainless steel, steel-aluminum composite die-casting, and titanium alloy can be selected.

[0057] In this embodiment, the first mold 1 is designed to achieve relative fixation of the metal shell 2 and the third mold 6 to ensure the stability of the glue injection process, that is, a clamping device, which can be reasonably designed according to the structure of the metal shell 2 and the third mold 6 according to industrial design guidelines.

[0058] The processing of the metal shell 2 is as follows:

[0059] The metal raw materials are sequentially subjected to CNC machining, sandblasting, anodizing and activation.

[0060] Preferably, the CNC machining includes machining a glue injection slot according to the design.

[0061] In this embodiment, CNC machining can also be used to process slots for configuring electronic components, such as slots for configuring related components in the final electronic device, such as slots for setting antenna electronic parts, slots for setting buttons, slots for setting batteries, and other mechanical structures such as slots, holes, etc. that are required to configure electronic components when the electronic product is used.

[0062] The CNC machining process can be designed to process the metal raw materials in a coordinated manner of rough machining and fine machining according to actual needs.

[0063] In this embodiment, the CNC processing process can perform different processing processes according to the purpose of the final frame, such as using it as a middle frame of a tablet computer, as a middle frame of a mobile phone, or as a middle frame of a smart watch, such as turning, milling, planing, grinding, drilling, boring, complex surface processing, and other processes that can be achieved by CNC processing in this field.

[0064] In this embodiment, the process design of sandblasting can be reasonably designed to ensure the anodizing effect, such as by using the sandblasting process performed before anodizing in the prior art.

[0065] Among them, the injection pressure of the decorative strip glue is less than 0.6MPa, for example, it can be 0.55MPa, 0.5MPa, 0.45MPa, 0.4MPa, 0.35MPa, 0.3MPa, 0.25MPa, 0.2MPa, 0.15MPa, 0.1MPa, 0.05MPa or 0.01MPa, but is not limited to the listed values, and other unlisted values ​​within the range also meet the requirements.

[0066] Among them, when a glue injection groove is set on the side of the metal shell 2, the width of the glue injection groove is 0.2-0.3mm, and the depth is 0.1-0.2mm. The width of the glue injection groove can be, for example, 0.2mm, 0.22mm, 0.24mm, 0.26mm, 0.28mm or 0.3mm, and the depth of the glue injection groove can be, for example, 0.1mm, 0.12mm, 0.14mm, 0.16mm, 0.18mm or 0.2mm, but is not limited to the listed values, and other values ​​not listed within the range also meet the requirements.

[0067] The top surface of the cured decorative strip is 0.05-0.15 mm higher than the surface of the metal shell 2, for example, it can be 0.05 mm, 0.06 mm, 0.08 mm, 0.1 mm, 0.12 mm, 0.14 mm or 0.15 mm, but is not limited to the listed values. Other values ​​not listed in this range also meet the requirements.

[0068] Among them, when a glue injection slot is set on the top of the metal shell 2, the width of the glue injection slot is 0.2-0.3mm, and the depth is 0.2-0.3mm. The width of the glue injection slot can be, for example, 0.2mm, 0.22mm, 0.24mm, 0.26mm, 0.28mm or 0.3mm, and the depth of the glue injection slot can be, for example, 0.2mm, 0.22mm, 0.24mm, 0.26mm, 0.28mm or 0.3mm, but is not limited to the listed values, and other values ​​not listed within the range also meet the requirements.

[0069] The side wall of the injection slot is provided with at least one groove, and of course, it can also be 2, 3 or 4 grooves, but it is not limited to the listed values, and other values ​​not listed within the range also meet the requirements.

[0070] Wherein, the at least two grooves are distributed at equal intervals.

[0071] Among them, the width of the groove is 3-5mm, for example, it can be 3mm, 3.2mm, 3.4mm, 3.6mm, 3.8mm, 4mm, 4.2mm, 4.4mm, 4.6mm, 4.8mm or 5mm, but is not limited to the listed values, and other unlisted values ​​within the range also meet the requirements.

[0072] Among them, the depth of the groove is 0.3-0.5 times the depth of the glue injection slot, for example, it can be 0.3 times, 0.32 times, 0.34 times, 0.36 times, 0.38 times, 0.4 times, 0.42 times, 0.44 times, 0.46 times, 0.48 times or 0.5 times, but is not limited to the listed values, and other unlisted values ​​within this range also meet the requirements.

[0073] The temperature of the anodization is 18-22°C, for example, 18°C, 19°C, 20°C, 21°C or 22°C, but is not limited to the listed values, and other values ​​not listed within the range also meet the requirements.

[0074] Among them, the current density of the anodization is 1-2A / dm2, for example, it can be 1A / dm2, 1.2A / dm2, 1.4A / dm2, 1.6A / dm2, 1.8A / dm2 or 2A / dm2, but is not limited to the listed values, and other unlisted values ​​within the range also meet the requirements.

[0075] Among them, the voltage of the anodization is 15.5-19.5V, for example, it can be 15.5V, 16V, 16.5V, 17V, 17.5V, 18V, 18.5V, 19V or 19.5V, but is not limited to the listed values, and other unlisted values ​​within the range also meet the requirements.

[0076] The anodizing time is 40-65 min, for example, 40 min, 45 min, 50 min, 55 min, 60 min or 65 min, but is not limited to the listed values, and other values ​​not listed within the range also meet the requirements.

[0077] In this embodiment, the electrolyte used in anodization is selected according to the type of oxide film to be formed.

[0078] Wherein, the activation includes using plasma to activate the glue injection slot.

[0079] 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.

[0080] 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, 0.002Pa, 0.004Pa, 0.006Pa, 0.008Pa, 0.01Pa, 0.02Pa, 0.04Pa, 0.06Pa, 0.08Pa, 0.1Pa, 0.2Pa, 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.

[0081] The activation time is 0.1-1s, for example, 0.1s, 0.2s, 0.4s, 0.6s, 0.8s or 0.1s, etc., but is not limited to the listed values, and other values ​​not listed within the range also meet the requirements.

[0082] In this embodiment, the gas for forming plasma includes helium, argon and other commonly used gases in the art.

[0083] Among them, the injection amount of the decorative strip glue is 1.002-1.006 times the volume of the glue injection slot, for example, it can be 1.002 times, 1.003 times, 1.004 times, 1.005 times or 1.006 times, but is not limited to the listed values, and other unlisted values ​​within this range also meet the requirements.

[0084] Wherein, the decorative strip glue comprises, by mass percentage:

[0085] Polybutylene terephthalate material 30-40%, polycarbonate material 20-30%, adhesive 30-50%;

[0086] In this embodiment, the polybutylene terephthalate material, the polycarbonate material and the adhesive in the decorative strip glue account for 100% in total.

[0087] In this embodiment, the mass percentage of polybutylene terephthalate material in the decorative strip glue 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 values ​​not listed in this range also meet the requirements.

[0088] In this embodiment, the mass percentage of polycarbonate material in the decorative strip glue 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 this range also meet the requirements.

[0089] In this embodiment, the mass percentage of the adhesive in the decorative strip glue is 30-50%, for example, it can be 30%, 32%, 34%, 36%, 38%, 40%, 42%, 44%, 46%, 48% or 50%, but is not limited to the listed values, and other unlisted values ​​within the range also meet the requirements.

[0090] In this embodiment, the polybutylene terephthalate material is glass fiber reinforced polybutylene terephthalate, and the mass percentage of glass fiber is 30-35%, 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.

[0091] In this embodiment, 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.

[0092] The adhesive comprises one or a combination of at least two of epoxy resin adhesive, acrylic adhesive or polymethyl methacrylate adhesive.

[0093] The type of adhesive selected determines the curing method of the decorative strip glue. For example, when the adhesive is a light-curing adhesive, the light-curing method is selected. When the adhesive is a heat-curing adhesive, the heat-curing method is selected.

[0094] Among them, the decorative strip glue also includes pigments; the pigments include one or a combination of at least two of red pigments, yellow pigments or blue pigments; the red pigment includes one or a combination of at least two of iron red pigments, bright red pigments or transparent red pigments; the yellow pigment includes lead chrome yellow pigment and / or iron yellow pigment; the blue pigment includes phthalocyanine blue pigment and / or ultramarine pigment.

[0095] In this embodiment, the amount of pigment added to the glue is reasonably selected according to the depth and type of color required by the design, and is not specifically limited.

[0096] In this embodiment, the decorative strip glue is prepared by mixing ingredients according to the mass percentage and stirring.

[0097] Wherein, the curing method includes thermal curing or light curing.

[0098] Among them, the choice of curing method is reasonably determined based on the glue. If the glue used is a heat-curing glue, then the heat-curing method can be selected. If the glue used is a light-curing glue, then the light-curing method can be selected.

[0099] Specifically, the curing molding of the antenna isolation strip adopts the following mold molding:

[0100] like Figure 1 , Figure 2 and Figure 3 As 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.

[0101] 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.

[0102] 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.

[0103] 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.

[0104] 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.

[0105] 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.

[0106] In this embodiment, activation is performed before the glue is injected into the mold cavity.

[0107] The activation includes using plasma to activate the injection slots;

[0108] 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.

[0109] 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.

[0110] 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.

[0111] 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.

[0112] The antenna isolation strips are distributed along the inner wall of the metal shell 2 to form internal support.

[0113] 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.

[0114] In this embodiment, the interior of the metal shell 2 is a space for accommodating electronic components after the finished electronic product is formed.

[0115] The groove body is a through groove that penetrates the wall thickness of the metal shell 2 .

[0116] 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.

[0117] 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.

[0118] 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.

[0119] 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.

[0120] 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.

[0121] 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.

[0122] 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.

[0123] In this embodiment, the total content of polybutylene terephthalate material, polycarbonate material, dielectric material and adhesive in the antenna protection isolation material is 100%.

[0124] 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.

[0125] 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.

[0126] Specifically, the dielectric material includes a combination of polytetrafluoroethylene and auxiliary materials or polytetrafluoroethylene.

[0127] 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).

[0128] 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.

[0129] 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.

[0130] 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.

[0131] Specifically, the adhesive includes one or a combination of at least two of epoxy resin adhesive, acrylic adhesive or polymethacrylate adhesive.

[0132] 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.

[0133] Specifically, the antenna protection isolation material also includes pigment.

[0134] The pigment includes one or a combination of at least two of red pigment, yellow pigment or blue pigment.

[0135] Wherein, the red pigment comprises one or a combination of at least one of iron red pigment, red powder pigment or transparent red pigment.

[0136] Wherein, the yellow pigment includes lead chrome yellow pigment and / or iron yellow pigment.

[0137] Wherein, the blue pigment includes phthalocyanine blue pigment and / or ultramarine pigment.

[0138] 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.

[0139] 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.

[0140] 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.

[0141] 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.

[0142] 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.

[0143] 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, and the first profiling module 10 is fixed on a first positioning plate 11. 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.

[0144] 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.

[0145] 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.

[0146] 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.

[0147] 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.

[0148] It is stated that the utility model uses the above-mentioned embodiments to illustrate the detailed structural features of the utility model, but the utility model is not limited to the above-mentioned detailed structural features, that is, it does not mean that the embodiment must rely on the above-mentioned detailed structural features to be implemented. Those skilled in the art should understand that any improvement to the embodiment, 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 embodiment.

[0149] 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, a variety of simple modifications can be made to the technical solution of this embodiment, and these simple modifications all fall within the protection scope of this embodiment.

[0150] 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.

[0151] In addition, various implementations of the present invention may be arbitrarily combined, and as long as they do not violate the concept of the present embodiment, they should also be regarded as the contents disclosed by the present invention.

Claims

1. A metal shell decorative strip injection molding die, wherein a shell opening end surface (21) of a metal shell (2) is provided with an injection slot (22), the injection molding die comprising a first die (1) for positioning the metal shell (2), characterized in that: The glue injection molding die also includes a third die (6) which is sealed and matched with the shell end face (21) and the outer peripheral surface of the metal shell (2) respectively; when the third die (6) and the first die (1) are molded into place, the third die (6) and the glue injection slot (22) form a decorative strip molding cavity, and at least one glue injection hole (60) which is connected to the decorative strip molding cavity is provided on the third die (6).

2. The metal shell decorative strip injection molding die according to claim 1, characterized in that: The third mold (6) has a glue injection groove body (61) connected to the glue injection groove position (22), and the glue injection groove position (22) and the glue injection groove body (61) form the decorative strip molding cavity.

3. The metal shell decorative strip injection molding die according to claim 1 or 2, characterized in that: The decorative strip forming cavity is annular.

4. The metal shell decorative strip injection molding die according to claim 2, characterized in that: The third mold (6) comprises a third module (62) having the glue injection groove body (61), and the third module (62) has an end face sealing surface (63) that is sealed to match the shell mouth end face (21), and a circumferential sealing surface (64) that is sealed to match the outer peripheral surface of the metal shell (2).

5. The metal shell decorative strip injection molding die according to claim 4, characterized in that: The third module (62) also has a matching contact surface (65) that matches the stop plane (12) of the first mold (1) or is spaced apart and parallel to the stop plane (12) of the first mold (1).

6. The metal shell decorative strip injection molding die according to claim 4, characterized in that: The third module (62) is annular and is fixed on a third positioning plate (66).

7. The metal shell decorative strip injection molding die according to claim 1, characterized in that: The decorative strip forming cavity is a polygonal cavity, and each side of the decorative strip forming cavity is connected to at least one of the glue injection holes (60).

8. The metal shell decorative strip injection molding die according to claim 7, characterized in that: Each of the glue injection holes (60) is connected to a glue injection nozzle (67).

9. The metal shell decorative strip injection molding die according to claim 8, characterized in that: The third mold (6) is provided with a stepped anti-slip hole (68), the glue injection nozzle (67) is installed in the stepped anti-slip hole (68), and the glue injection nozzle (67) has an anti-slip shoulder (670) in the circumference thereof which abuts against the stop surface of the stepped anti-slip hole (68).

10. The metal shell decorative strip injection molding die according to claim 1, characterized in that: The first mold (1) comprises at least one first profiling module (10) which is sealed and matched with the outer surface of the metal shell (2); the first profiling module (10) is fixed on a first positioning plate (11).

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