Mobile phone plastic middle frame, injection mold and injection method

Abstract

The present application relates to the technical field of mobile phone middle frame, especially to a mobile phone plastic middle frame, which comprises a middle frame body and a floating metal mounting sheet, and the middle frame body is made of TPU plastic material by injection molding; a floating connecting arm is injection molded on the battery mounting area of the middle frame body, and the lower surface of the floating metal mounting sheet is connected with the upper surface of the floating connecting arm; the floating connecting arm is provided with a first limiting through slot, and the first limiting through slot penetrates the upper and lower surfaces of the floating connecting arm; the floating metal sheet is provided with a first limiting column, and the first limiting column is inserted into the first limiting through slot. Compared with the prior art, the pressure relief and buffering effect between the floating metal mounting sheet and the floating connecting arm is realized; the mobile phone plastic middle frame is greatly reduced due to deformation and extrusion of the battery, and the probability of electrolyte leakage, internal short circuit and inflation of the battery is reduced. The present application also provides an injection molding mold and an injection molding method for injection molding a mobile phone plastic middle frame, compared with the prior art, the assembly steps are simplified, the assembly time is reduced, and the production efficiency of the mobile phone middle frame is improved.

Description

Technical Field

[0001] This invention relates to the field of mobile phone mid-frame technology, and in particular to a plastic mid-frame for mobile phones, an injection mold, and an injection molding method. Background Technology

[0002] In the field of mobile phone mid-frames, some plastic mid-frames, made from injection-molded plastic materials, have significantly lower drop resistance than metal mid-frames. However, plastic mid-frames suffer far less signal loss than metal mid-frames, so many manufacturers still use them. For assembling the plastic mid-frame with the battery, a battery compartment is typically located on the plastic mid-frame. The battery is placed inside the compartment and secured with adhesive strips or foam adhesive. Subsequently, the motherboard is stacked parallel to the battery, and the battery and motherboard are connected via connectors.

[0003] However, during the actual research and development process, the inventors discovered that due to the lack of a buffer protection structure between the periphery of the phone's plastic frame and the periphery of the battery, during drop tests, if the periphery of the phone's plastic frame is the impact surface, it will deform, causing the battery to be squeezed and dented. If the battery dent is too large, electrolyte leakage, internal short circuits, and gas expansion may occur. Based on the above drop tests of the phone's plastic frame, the inherent poor drop resistance of the phone's plastic frame reduces its protective performance for the battery, and the battery protection effect needs further improvement.

[0004] Therefore, a new technical solution needs to be researched to address the above problems. Summary of the Invention

[0005] In view of this, the present invention addresses the deficiencies of the existing technology, and its main objective is to provide a plastic mid-frame for mobile phones that effectively solves the problem that the plastic mid-frame for mobile phones has poor drop resistance, resulting in an inability to effectively protect the battery; thereby improving the protective effect of the plastic mid-frame for the battery and significantly reducing the probability of electrolyte leakage, internal short circuits, and gas swelling caused by deformation and compression of the battery by the plastic mid-frame.

[0006] This invention provides a plastic mid-frame for mobile phones, including... The middle frame body is injection molded from TPU plastic material; the middle frame body encloses a battery mounting area and a sub-board mounting area, and the battery mounting area has a floating connecting arm injection molded from TPU plastic material; and, Floating metal mounting plates are inlaid and molded into the floating connecting arms; The floating metal mounting plate has its lower surface connected to the upper surface of the floating connecting arm; the floating connecting arm has a first limiting groove that extends through the upper and lower surfaces of the floating connecting arm; the floating metal plate has a first limiting post that is inserted into the first limiting groove.

[0007] The beneficial effects of the mobile phone plastic mid-frame provided by the present invention are as follows: Compared with the prior art, firstly, by injection molding a floating connecting arm in the battery mounting area of ​​the mid-frame body and embedding a floating metal mounting plate in the floating connecting arm, the floating metal mounting plate is used to support and fix the battery bracket; in the drop test, when the periphery of the mid-frame body is used as the drop force surface, once the mid-frame body deforms, only the floating connecting arm will be displaced. When the floating connecting arm is displaced, the first limiting post of the floating metal mounting plate can be separated from the plastic of the floating connecting arm, allowing the first limiting post to move in the first limiting through groove, thereby reducing the impact force from the deformation of the mid-frame body, thus achieving a force relief and buffering effect between the floating metal mounting plate and the floating connecting arm; significantly reducing the probability of electrolyte leakage, internal short circuit and gas expansion of the battery due to deformation of the mobile phone plastic mid-frame; Secondly, by installing the battery using a structure with floating connecting arms and floating metal mounting plates, there is no need to use pull tab adhesive or foam adhesive for fixing. When replacing the battery later, there is no need to spend time cleaning and reapplying pull tab adhesive or foam adhesive. Moreover, the position of the floating metal mounting plates can be adjusted according to the size of the battery, thereby adapting to the replacement of batteries of different sizes. This reduces the difficulty of battery replacement and improves the convenience and versatility of battery replacement. Thirdly, by installing the battery using a structure with floating connecting arms and floating metal mounting plates, a gap can be created between the battery and the mid-frame body. This eliminates the need to fill the gap with buffer adhesive to absorb the impact of deformation of the mid-frame body, which can significantly improve the battery's heat dissipation effect. This ensures that the battery can operate at a reliable and stable temperature, thereby improving the battery's lifespan and reliability.

[0008] As a preferred embodiment, the first limiting through groove is inclined at a 45-degree angle to the horizontal plane, and the first limiting through groove includes an inner end point and an outer end point; After the floating metal mounting plate is embedded in the floating connecting arm, the first limiting post is located at the inner end of the first through groove and the surface of the first limiting post is covered with plastic material.

[0009] As a preferred embodiment, the first limiting post is located at the center of the bottom of the floating mounting plate, the first limiting post extends downward, and the length of the first limiting post is less than or equal to the depth of the first limiting through groove; The thickness of the floating mounting plate is less than or equal to the thickness of the floating connecting arm.

[0010] The present invention also provides an injection mold for injection molding a plastic mid-frame for a mobile phone; the injection mold includes... The lower mold base has a lower mold core at its top; a side slide is provided beside the lower mold core, and the lower mold core and the side slide together form a first molding cavity for injection molding a plastic frame; and, The upper mold base is movable up and down and installed on the top of the lower mold base; the bottom of the upper mold base is provided with an upper mold core, and the upper mold core and the lower mold core can form a second molding cavity for injection molding of plastic mounting plate; the first molding cavity and the second molding cavity are connected in a conductive manner. The lower mold core is provided with a first insert that can move up and down. The top of the first insert is lower than the top of the lower mold core to form an installation notch for installing a floating metal mounting piece. A third molding cavity for injection molding a floating connecting arm is provided between the installation notch and the second molding cavity. The upper mold core is provided with a second insert. The bottom of the second insert has a second molding protrusion. The second molding protrusion can be inserted into the third molding cavity to injection mold a first limiting through groove.

[0011] The beneficial effects of the injection mold provided by this invention are as follows: compared with the prior art, before the upper mold base and the lower mold base are closed, the floating metal mounting piece is installed into the mounting notch; after the upper mold base and the lower mold base are closed, the second forming protrusion can be used to abut against the surface of the floating metal mounting piece, and the first limiting through groove can be formed by injection molding using the second forming protrusion; with this structure, the assembly process between the floating metal mounting piece and the middle frame body can be simplified by using the injection mold to complete the inlay operation of the middle frame body and the floating metal mounting piece, shortening the production time of the plastic middle frame of the mobile phone, thereby further improving production efficiency.

[0012] As a preferred embodiment, the second forming protrusion has a covering notch on the side facing the first limiting post. After the upper mold base and the lower mold base are closed, the second forming protrusion can abut against the floating metal mounting piece and cover the side of the first limiting post through the covering notch.

[0013] As a preferred embodiment, the thickness of the floating metal mounting plate is less than or equal to the depth of the mounting notch. The top of the first insert is provided with a first embedding protrusion and a second embedding protrusion. The first embedding protrusion is used to insert into the mounting hole of the floating metal mounting plate, and the second embedding protrusion is used to insert into the buffer groove of the floating metal mounting plate.

[0014] As a preferred embodiment, it also includes multiple third inserts, which are movable up and down and mounted on the lower mold core. The upper surface of the third insert is exposed and flush with the upper surface of the lower mold core, and the side surface of the third insert is exposed and flush with the side surface of the lower mold core. The third insert is used to be injection molded into the inner fastener of the plastic frame. The lower mold core is provided with a through hole for the first insert and the third insert to extend downward; the lower mold base is provided with a first ejector plate, and the first insert and the third insert both extend downward and are fixed to the first ejector plate.

[0015] As a preferred embodiment, the side slide includes a front slide that is movably located in front of the lower mold core, a rear slide that is movably located behind the lower mold core, a left slide that is movably located to the left of the lower mold core, and a right slide that is movably located to the right of the lower mold core. The front sliding body, rear sliding body, left sliding body and right sliding body each have a first inclined surface and a first inclined driving hole; The upper mold base is provided with a second inclined surface that can abut against the first inclined surface and a first inclined drive rod for insertion into the first inclined drive hole.

[0016] As a preferred option, the upper mold base is provided with a glue injection port and a runner plate, and the glue injection port is connected to the runner plate through the main runner; The runner plate is equipped with a hot nozzle, and the upper surface of the lower mold core is equipped with a branch runner that is connected to the hot nozzle. The branch runner is connected to the first molding cavity and / or the second molding cavity.

[0017] The present invention also provides an injection molding method for an injection mold, applied to the aforementioned injection mold, the injection molding method comprising: Step 1: Provide an injection mold, assemble the injection mold into the injection molding machine, and connect the upper mold base to the mold closing control system of the injection molding machine; Step 2: The mold closing control system drives the upper mold base to move upward relative to the lower mold base, so that the upper mold base and the lower mold base open the mold and expose the upper mold core and the lower mold core; Step 3: Provide a release agent and spray it onto the surface of the mounting notch and the surface of the floating metal mounting piece that does not participate in the inlay molding. Step 4: Insert the floating metal mounting piece into the mounting notch. The mold closing control system drives the upper mold base to move downward relative to the lower mold base, completing the mold closing between the upper and lower mold bases. The second forming protrusion of the second insert abuts against the side of the floating metal mounting piece and the first limiting post. Step 5: The mold closing control system drives the upper mold base to move downward relative to the lower mold base, so that the upper mold base simultaneously drives the front slide, rear slide, left slide and right slide to move closer to the lower mold core; after the upper mold base and the lower mold base are closed, they form the first molding cavity and the second molding cavity. Step 6: TPU hot melt plastic paste is supplied through the injection system of the injection molding machine. The TPU hot melt plastic paste is injected into the first molding cavity and the second molding cavity through the injection port, the manifold plate, the hot nozzle and the branch channel. The TPU hot melt plastic paste is cooled and solidified by the cooling system of the injection mold for 20-60 seconds to form the plastic middle frame of the mobile phone. Step 7: The mold closing control system drives the upper mold base to move upward relative to the lower mold base, causing the upper mold base and the lower mold base to open the mold. During the mold opening process, the front slide, rear slide, left slide and right slide move away from the lower mold core in a synchronous linkage, so that the front slide, rear slide, left slide, right slide, upper mold core and the second insert are demolded from the middle frame body and the floating metal mounting plate. Step 8: The ejection control system drives the first ejector plate to move upward, and the first ejector plate moves the first insert and the third insert upward relative to the lower mold core, so that the middle frame body is demolded by the first insert, the third insert and the lower mold core and the material is unloaded; Step 9: Repeat steps 2-8 to continue injection molding the plastic frame of the mobile phone, which includes the floating metal mounting piece.

[0018] The beneficial effects of the injection molding method for injection molds provided by this invention are as follows: Compared with the prior art, before the upper mold base and lower mold base are closed, the floating metal mounting piece is inserted into the mounting notch; after the upper mold base and lower mold base are closed and the TPU plastic hot melt slurry is injected, the floating metal mounting piece can be covered by the TPU plastic hot melt slurry and cured to obtain the middle frame body containing the floating metal mounting piece. Subsequently, the middle frame body can be directly used to assemble the battery. This operation method simplifies the assembly steps, reduces assembly time, and thus improves the production efficiency of the mobile phone middle frame, thereby synergistically improving the overall production efficiency of the mobile phone. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a top view of the plastic mid-frame of a mobile phone provided in an embodiment of this application; Figure 2 yes Figure 1 The cross-sectional view at point DD of the plastic frame of the mobile phone shown; Figure 3 yes Figure 1 A magnified view of point F on the plastic frame of the mobile phone shown; Figure 4 yes Figure 1 The diagram shows the battery being installed in the plastic frame of the mobile phone. Figure 5 This is a three-dimensional structural schematic diagram of the injection mold provided in the embodiments of this application; Figure 6 yes Figure 5 A schematic diagram of the specific structure of the lower mold base of the injection mold shown; Figure 7 yes Figure 6 A magnified view of part A of the lower mold base of the injection mold shown; Figure 8 yes Figure 5 A schematic diagram of the specific structure of the upper mold base of the injection mold shown; Figure 9yes Figure 8 A magnified view of part B on the upper mold base of the injection mold shown; Figure 10 yes Figure 5 The top view of the injection mold shown; Figure 11 yes Figure 10 The cross-sectional view of the injection mold shown at point AA; Figure 12 yes Figure 11 A magnified view of part C of the injection mold shown; Figure 13 yes Figure 10 The cross-sectional view of the injection mold shown at point BB; Figure 14 yes Figure 13 A magnified view of part D of the injection mold shown; Figure 15 yes Figure 10 The cross-sectional view of the injection mold at the CC section shown; Figure 16 yes Figure 15 A magnified view of part E of the injection mold shown.

[0021] The following are the labeling elements in the figure: 100. Mobile phone plastic frame; 11. Mid-frame body; 1101. Battery mounting area; 1102. Sub-board mounting area; 1103. Plastic frame; 1104. Plastic mounting plate; 12. Floating connecting arm; 121. First limiting through groove; 1211. Inner end point; 1212. Outer end point; 13. Floating metal mounting piece; 131. First limiting post; 132. Mounting hole; 133. Buffer groove; 14. Inner fastener; 15. Battery; 200. Injection molds; 2001, First molding cavity; 2002, Second molding cavity; 2003, Third molding cavity; 21, Lower mold base; 211, Lower mold core; 212, First insert; 2121, First filling protrusion; 2122, Second filling protrusion; 213, Mounting notch; 214, Third insert; 215, First ejector plate; 2151, Second ejector plate; 2152, Ejector pin; 216, Front slide; 217, Rear slide 218. Slide; 219. Left slide; 2101. Right slide; 2102. First inclined surface; 2103. First inclined drive hole; 2104. Branch runner; 22. Upper mold base; 221. Upper mold core; 222. Second insert; 2221. Second forming protrusion; 2222. Covering notch; 223. Second inclined surface; 224. First inclined drive rod; 225. Injection port; 226. Runner plate; 227. Hot nozzle. Detailed Implementation

[0022] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0023] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0024] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0025] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0026] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0027] Please refer to the following: Figures 1 to 4 The plastic mid-frame 100 for mobile phones provided in this application embodiment will now be described. The plastic mid-frame 100 for mobile phones includes a mid-frame body 11 and a floating metal mounting piece 13.

[0028] The middle frame body 11 is injection molded from TPU plastic material, and the floating metal mounting plate 13 is made of stainless steel or titanium alloy material. The middle frame body 11 encloses a battery mounting area 1101 and a sub-plate mounting area 1102. The battery mounting area 1101 is injection molded from TPU plastic material with a floating connecting arm 12. The floating metal mounting plate 13 is embedded in the floating connecting arm 12, wherein the lower surface of the floating metal mounting plate 13 is connected to the upper surface of the floating connecting arm 12. The floating connecting arm 12 is provided with a first limiting through groove 121, which penetrates the upper and lower surfaces of the floating connecting arm 12. The floating metal plate is provided with a first limiting post 131, which is inserted into the first limiting through groove 121.

[0029] Specifically, compared with the prior art, in the first aspect, by injection molding a floating connecting arm 12 in the battery mounting area 1101 of the mid-frame body 11, and embedding a floating metal mounting piece 13 in the floating connecting arm 12, the floating metal mounting piece 13 is used to support and fix the battery bracket; in the drop test, when the periphery of the mid-frame body 11 is used as the drop force surface, once the mid-frame body 11 deforms, only the floating connecting arm 12 will be displaced. When the floating connecting arm 12 is displaced, the first limiting post 131 of the floating metal mounting piece 13 can be separated from the plastic of the floating connecting arm 12, allowing the first limiting post 131 to move in the first limiting through groove 121, thereby reducing the impact force from the deformation of the mid-frame body 11, thus achieving the force relief and buffering effect between the floating metal mounting piece 13 and the floating connecting arm 12; the probability of the battery being squeezed by the deformation of the plastic mid-frame 100 is greatly reduced, and the probability of electrolyte leakage, internal short circuit and gas expansion of the battery is reduced; Secondly, by installing the battery using the structure of the floating connecting arm 12 and the floating metal mounting plate 13, there is no need to use pull tab adhesive or foam adhesive for fixing. When replacing the battery later, there is no need to spend time cleaning and reapplying pull tab adhesive or foam adhesive. Moreover, the position of the floating metal mounting plate 13 can be adjusted according to the size of the battery, thereby adapting to the replacement of batteries of different sizes. This reduces the difficulty of battery replacement and improves the convenience and versatility of battery replacement. Thirdly, by installing the battery using a structure with floating connecting arms 12 and floating metal mounting plates 13, a gap can be created between the battery and the middle frame body 11. This eliminates the need to fill the gap with buffer adhesive to absorb the impact of deformation of the middle frame body 11, which can significantly improve the heat dissipation of the battery. This ensures that the battery can operate at a reliable and stable temperature, thereby improving the battery's lifespan and reliability.

[0030] In this embodiment, the first limiting groove 121 is inclined at a 45-degree angle on the horizontal plane. The first limiting groove 121 includes an inner end point 1211 and an outer end point 1212. After the floating metal mounting piece 13 is embedded in the floating connecting arm 12, the first limiting post 131 is located at the position of the inner end point 1211 of the first groove and part of the surface of the first limiting post 131 is covered by TPU plastic material.

[0031] It is understandable that after the floating metal mounting plate 13 is embedded in the floating connecting arm 12, it is initially fixedly connected; only under the action of external force will the first limiting post 131 of the floating metal mounting plate 13 detach from the TPU plastic material, so that the first limiting post 131 can slide freely in the first limiting through groove 121. Therefore, the connection state between the floating metal mounting plate 13 and the floating connecting arm 12 is defined to have at least a first state and a second state, which can be used to install the battery in either the first state or the second state according to actual needs. When the battery is installed on the floating metal mounting plate 13 in the first state, it can cause the floating connecting arm 12 to move when the middle frame body 11 deforms, thereby causing the first limiting post 131 to detach from the TPU plastic material and slide in the first limiting through groove 121, thereby achieving a floating buffer effect and reducing the occurrence of battery compression due to deformation of the middle frame body 11. When the battery is installed on the floating metal mounting plate 13 in the second state, the position of the floating metal mounting plate 13 can be adjusted according to the different sizes of the battery to accommodate batteries of different sizes, thereby improving versatility and adaptability. This method is especially convenient for users to change to different specifications of batteries later, and the maintenance and modification costs are low and convenient.

[0032] More specifically, the first limiting post 131 is located at the center of the bottom of the floating mounting plate, the first limiting post 131 extends downward, and the length of the first limiting post 131 is less than or equal to the depth of the first limiting through groove 121; the thickness of the floating mounting plate is less than or equal to the thickness of the floating connecting arm 12.

[0033] It should be noted that, in its initial state, the first limiting post 131 needs to be located at the inner end point 1211 of the first limiting channel 121, and the inner end point 1211 is molded together with the TPU plastic material. Even if the position of the floating metal mounting piece 13 needs to be changed when changing to a different battery specification, the first limiting post 131 can only be adjusted between the inner end point 1211 and the middle position of the first limiting channel 121. Once the first limiting post 131 is located between the first limiting channel 121 and the outer end point 1212, its subsequent floating buffer performance will be greatly reduced.

[0034] Furthermore, the middle frame body 11 includes a plastic frame 1103 and a plastic mounting plate 1104 integrally formed on the inner surface of the plastic frame 1103. The plastic frame 1103 extends vertically, and the plastic mounting plate 1104 extends horizontally toward the center of the middle frame body 11. The floating connecting arm 12 is integrally formed on the inner end of the plastic mounting plate 1104. The plastic frame 1103 encloses the battery mounting area 1101 and the sub-plate mounting area 1102.

[0035] Preferably, the floating metal mounting plate 13 is provided with mounting holes 132 and buffer grooves 133 penetrating its upper and lower surfaces. The mounting holes 132 can be through holes or screw holes, adapted for battery installation. There are at least two buffer grooves 133, which are spaced apart along the extension direction of the first limiting through groove 121. Under the action of external force, the floating metal mounting plate 13 itself can also have a certain buffering effect, further improving the protection effect on the battery.

[0036] More specifically, the thickness of the floating connecting arm 12 is between 0.2mm and 0.4mm, and the thickness of the floating metal mounting plate 13 is between 0.2mm and 0.4mm. Due to the thinness of the floating connecting arm, the floating connecting arm 12 itself has the ability to deform vertically, thereby enabling the floating metal mounting plate 13 to deviate vertically and horizontally. By utilizing the structure of the first limiting post 131 inserted into the first limiting through slot 121, a localized micro-floating effect is achieved. Compared to traditional technologies, this fully floating structure eliminates the need for suspension components such as springs, slide rails, and dampers, making it suitable for the current trend of ultra-thin mobile phones.

[0037] Please refer to the following: Figures 5 to 16 The injection mold 200 provided in the embodiments of this application will now be described. The injection mold is used to injection mold the mobile phone plastic frame 100 including the floating metal mounting piece 13, that is, the finished product of the entire mobile phone plastic frame.

[0038] The injection mold 200 includes a lower mold base 21 and an upper mold base 22. The upper mold base 22 can be driven by the mold closing control system of the injection molding machine to move downward relative to the lower mold base 21 for mold closing or upward for mold opening. The lower mold base 21 has a lower mold core 211 at its top and a side slide on its side. The lower mold core 211 and the side slide form a first molding cavity 2001 for injection molding a plastic frame 1103. The upper mold base 22 has an upper mold core 221 at its bottom. The upper mold core 221 and the lower mold core 211 can form a second molding cavity 2002 for injection molding a plastic mounting plate 1104. The first molding cavity 2001 and the second molding cavity 2002 are electrically connected. The lower mold core 211 is provided with a first insert 212 that can move up and down. The top of the first insert 212 is lower than the top of the lower mold core 211 to form an installation notch 213 for installing the floating metal mounting piece 13. A third molding cavity 2003 for injection molding the floating connecting arm 12 is provided between the installation notch 213 and the second molding cavity 2002. The upper mold core 221 is provided with a second insert 222. The bottom of the second insert 222 has a second molding protrusion 2221. The second molding protrusion 2221 can be inserted into the third molding cavity to injection mold the first limiting through groove 121.

[0039] Specifically, compared with the prior art, before the upper mold base 22 and the lower mold base 21 are closed, the floating metal mounting piece 13 is inserted into the mounting notch 213; after the upper mold base 22 and the lower mold base 21 are closed, the second molding protrusion 2221 can be used to abut against the surface of the floating metal mounting piece 13, and the first limiting through groove 121 can be injection molded using the second molding protrusion 2221; with this structure, the inlay operation of the middle frame body 11 and the floating metal mounting piece 13 can be completed using the injection mold 200, which can simplify the assembly process between the floating metal mounting piece 13 and the middle frame body 11, shorten the production time of the mobile phone plastic middle frame 100, and further improve production efficiency.

[0040] In some embodiments, the second forming protrusion 2221 has a covering notch 2222 on the side facing the first limiting post 131; when the upper mold base 22 and the lower mold base 21 are closed, the second forming protrusion 2221 can abut against the floating metal mounting piece 13 and cover part of the side of the first limiting post 131 through the covering notch 2222. The thickness of the floating metal mounting piece 13 is less than or equal to the depth of the mounting notch 213. The top of the first insert 212 is provided with a first filling protrusion 2121 and a second filling protrusion 2122. The first filling protrusion 2121 is used to insert into the mounting hole 132 of the floating metal mounting piece 13, and the second filling protrusion 2122 is used to insert into the buffer groove 133 of the floating metal mounting piece 13. This structure can effectively control the TPU plastic material to only cover the lower surface of the floating metal mounting piece 13 and part of the side of the first limiting post 131, thereby controlling the first limiting post 131 to reliably detach from the TPU plastic material under the action of external force, and realizing the displacement between the floating metal mounting piece 13 and the floating connecting arm 12.

[0041] Specifically, it also includes multiple third inserts 214, which are movable up and down and installed on the lower mold core 211. The upper surface of the third insert 214 is exposed and flush with the upper surface of the lower mold core 211, and the side surface of the third insert 214 is exposed and flush with the side surface of the lower mold core 211. The third insert 214 is used to injection mold the inner fastener 14 of the plastic frame 1103. The lower mold core 211 is provided with through holes for the first insert 212 and the third insert 214 to extend downward. The lower mold base 21 is provided with a first ejector plate 215, and the first insert 212 and the third insert 214 both extend downward and are fixed to the first ejector plate 215.

[0042] Furthermore, it also includes a second ejector plate 2151. The first ejector plate 215 and the second ejector plate 2151 are stacked one on top of the other. The second ejector plate 2151 is provided with ejector pins 2152. The ejector pins 2152 pass through the lower mold core 211 and extend or retract from the upper surface of the lower mold core 211. These ejector pins 2152 can be used to eject the plastic frame 100 of the mobile phone or the runner plastic according to their specific setting position. The first ejector plate 215 and the second ejector plate 2151 are both driven to move up and down by the ejection control system of the injection molding machine.

[0043] Specifically, the side slides include a front slide 216 movably disposed in front of the lower mold core 211, a rear slide 217 movably disposed behind the lower mold core 211, a left slide 218 movably disposed to the left of the lower mold core 211, and a right slide 219 movably disposed to the right of the lower mold core 211; the front slide 216, rear slide 217, left slide 218, and right slide 219 each have a first inclined surface 2101 and a first inclined drive hole 2102; the upper mold base 22 is provided with a second inclined surface 223 that can abut against the first inclined surface 2101 and a first inclined drive rod 224 for insertion into the first inclined drive hole 2102.

[0044] Understandably, the second inclined surface is located on the shovel, which is fixedly installed on the lower surface of the upper mold base. The shovel drives the front slide, rear slide, left slide, and right slide to move and lock their positions. This ensures that when injecting TPU hot melt plastic slurry, the injection pressure can prevent the front slide, rear slide, left slide, and right slide from moving, thereby improving the reliability of injection molding operations and production yield.

[0045] More specifically, the upper mold base 22 is provided with a glue injection port 225 and a runner plate 226. The glue injection port 225 is connected to the runner plate 226 through the main runner. The runner plate 226 is provided with a hot nozzle 227. The upper surface of the lower mold core 211 is provided with a branch runner 2103 connected to the hot nozzle 227. The branch runner 2103 is connected to the first molding cavity 2001 and / or the second molding cavity 2002.

[0046] It should be noted that the first molding cavity 2001 is mainly used for injection molding the middle frame body 11. With the cooperation of the second molding cavity 2002, the top of the first molding cavity 2001 is used for injection molding the plastic mounting plate 1104 and the floating connecting arm 12, etc.; that is, the injection mold 200 injection molds the mobile phone plastic middle frame 100 with its bottom facing upwards. This structure not only improves the demolding reliability of the mobile phone plastic middle frame 100, but also makes the feeding of the floating metal mounting piece 13 more reliable. The injection mold is a dual-cavity mold, and multiple hot nozzles can be configured as needed for each cavity. These hot nozzles are all connected to the sprue through a runner plate.

[0047] This application embodiment also provides an injection molding method for an injection mold 200. The injection molding method is applied to the injection mold 200 used for injection molding a mobile phone plastic frame 100. The injection molding method for the injection mold 200 includes... Step 1: Provide injection mold 200, assemble injection mold 200 into injection molding machine, and connect upper mold base 22 to mold closing control system of injection molding machine; Step 2: The mold closing control system drives the upper mold base 22 to move upward relative to the lower mold base 21, so that the upper mold base 22 and the lower mold base 21 open the mold and expose the upper mold core 221 and the lower mold core 211. Step 3: Provide a release agent and spray it onto the surface of the mounting notch 213 and the surface of the floating metal mounting piece 13 that does not participate in the inlay molding. Step 4: Insert the floating metal mounting piece 13 into the mounting notch 213. The mold closing control system drives the upper mold base 22 to move downward relative to the lower mold base 21, completing the mold closing between the upper mold base 22 and the lower mold base 21. The second forming protrusion 2221 of the second insert 222 abuts against the floating metal mounting piece 13 and part of the side of the first limiting post 131. Step 5: The mold closing control system drives the upper mold base 22 to move downward relative to the lower mold base 21, so that the upper mold base 22 simultaneously drives the front slide 216, the rear slide 217, the left slide 218 and the right slide 219 to move closer to the lower mold core 211; after the upper mold base 22 and the lower mold base 21 are closed, they form the first molding cavity 2001 and the second molding cavity 2002. Step 6: TPU hot melt plastic paste is supplied through the injection system of the injection molding machine. The TPU hot melt plastic paste is injected into the first molding cavity 2001 and the second molding cavity 2002 through the injection port 225, the manifold plate 226, the hot nozzle 227 and the branch channel 2103. The TPU hot melt plastic paste is cooled and solidified by the cooling system of the injection mold 200 for 20-60 seconds to form the mobile phone plastic frame 100. Step 7: The mold closing control system drives the upper mold base 22 to move upward relative to the lower mold base 21, so that the upper mold base 22 and the lower mold base 21 open the mold. During the process of the upper mold base 22 moving upward relative to the lower mold base 21 to open the mold, the front slide 216, the rear slide 217, the left slide 218 and the right slide 219 move away from the lower mold core 211 in a synchronous linkage, so that the front slide 216, the rear slide 217, the left slide 218, the right slide 219, the upper mold core 221 and the second insert 222 are demolded from the middle frame body 11 and the floating metal mounting plate 13. Step 8: The ejection control system drives the first ejector plate 215 to move upward. The first ejector plate 215 moves upward relative to the lower mold core 211 in conjunction with the first insert 212 and the third insert 214, so that the middle frame body 11 is demolded by the first insert 212, the third insert 214 and the lower mold core 211 and is unloaded. Step 9: Repeat steps 2-8 to continue injection molding the mobile phone plastic frame 100 containing the floating metal mounting piece 13.

[0048] Specifically, in step 3, the surface of the floating metal mounting piece 13 that does not participate in the inlay molding is the lower surface of the floating mounting piece after the mounting notch 213, and a release agent needs to be applied to the surface of the first limiting post 131 of the floating metal mounting piece 13 facing the second molding protrusion 2221 to prevent the subsequent TPU plastic hot melt paste from adhering to these areas after injection.

[0049] Specifically, in step 4, after the upper mold base 22 and the lower mold base 21 are closed, the second molding protrusion 2221 of the second insert 222 abuts against the lower surface of the floating metal mounting piece 13 after it is installed in the mounting notch 213, and covers the peripheral side of the first limiting post 131 through the covering notch 2222 of the second molding protrusion 2221. The covered part of the peripheral side of the first limiting post 131 occupies at least one-third of the circumference of the peripheral side of the first limiting post 131, but cannot occupy three-quarters of the axial length of the peripheral side of the first limiting post 131; in order to avoid the TPU plastic material covering the first limiting post 131 too much, which would affect the effect and reliability of the subsequent floating connection of the first limiting post 131 detaching from the TPU plastic material.

[0050] The above are merely preferred embodiments of the present invention, and only specifically describe the technical principles of the present invention. These descriptions are only for explaining the principles of the present invention and should not be construed as limiting the scope of protection of the present invention in any way. Based on this explanation, any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention, as well as other specific embodiments of the present invention that can be conceived by those skilled in the art without creative effort, should be included within the scope of protection of the present invention.

Claims

1. A plastic mid-frame for a mobile phone, characterized in that, include The middle frame body (11) is injection molded from TPU plastic material; the middle frame body (11) encloses a battery mounting area (1101) and a sub-board mounting area (1102), and the battery mounting area (1101) is injection molded from TPU plastic material with a floating connecting arm (12); and, A floating metal mounting plate (13) is embedded in the floating connecting arm (12). The lower surface of the floating metal mounting plate (13) is connected to the upper surface of the floating connecting arm (12); the floating connecting arm (12) is provided with a first limiting through groove (121), which penetrates the upper and lower surfaces of the floating connecting arm (12); the floating metal mounting plate (13) is provided with a first limiting post (131), which is inserted into the first limiting through groove (121); The first limiting through groove (121) is inclined at a 45-degree angle on the horizontal plane. The first limiting through groove (121) includes an inner end point (1211) and an outer end point (1212). After the floating metal mounting plate (13) is inlaid and formed on the floating connecting arm (12), the first limiting post (131) is located at the inner end point (1211) of the first through groove; the lower surface of the floating metal mounting plate (13) and part of the side of the first limiting post (131) are covered by TPU plastic material.

2. The mobile phone plastic frame according to claim 1, characterized in that, The first limiting post (131) is located at the center of the bottom of the floating metal mounting plate (13). The first limiting post (131) extends downward and the length of the first limiting post (131) is less than or equal to the depth of the first limiting through groove (121). The thickness of the floating metal mounting plate (13) is less than or equal to the thickness of the floating connecting arm (12).

3. An injection mold for injection molding the plastic mid-frame of a mobile phone as described in any one of claims 1-2, characterized in that, Injection mold (200) includes The lower mold base (21) has a lower mold core (211) on its top; a side slide is provided on the side of the lower mold core (211), and the lower mold core (211) and the side slide together form a first molding cavity (2001) for injection molding a plastic frame (1103); and, The upper mold base (22) is movable up and down and installed on the top of the lower mold base (21); the bottom of the upper mold base (22) is provided with an upper mold core (221), the upper mold core (221) and the lower mold core (211) can form a second molding cavity (2002) for injection molding of plastic mounting plate (1104), and the first molding cavity (2001) and the second molding cavity (2002) are connected in a conductive manner; The lower mold core (211) is provided with a first insert (212) that can move up and down. The top of the first insert (212) is lower than the top of the lower mold core (211) to form an installation notch (213) for installing a floating metal mounting piece (13). A third molding cavity (2003) for injection molding a floating connecting arm (12) is provided between the installation notch (213) and the second molding cavity (2002). The upper mold core (221) is provided with a second insert (222). The bottom of the second insert (222) has a second molding protrusion (2221). The second molding protrusion (2221) can be inserted into the third molding cavity to injection mold a first limiting through groove (121).

4. The injection mold according to claim 3, characterized in that, The second forming protrusion (2221) has a covering notch (2222) on the side facing the first limiting post (131). When the upper mold base (22) and the lower mold base (21) are closed, the second forming protrusion (2221) can abut against the floating metal mounting piece (13) and cover part of the side of the first limiting post (131) through the covering notch (2222).

5. The injection mold according to claim 3, characterized in that, The thickness of the floating metal mounting plate (13) is less than or equal to the depth of the mounting notch (213). The top of the first insert (212) is provided with a first filling protrusion (2121) and a second filling protrusion (2122). The first filling protrusion (2121) is used to insert into the mounting hole (132) of the floating metal mounting plate (13), and the second filling protrusion (2122) is used to insert into the buffer groove (133) of the floating metal mounting plate (13).

6. The injection mold according to claim 4 or 5, characterized in that, It also includes multiple third inserts (214), which can be installed vertically on the lower mold core (211). The upper surface of the third insert (214) is exposed and flush with the upper surface of the lower mold core (211), and the side of the third insert (214) is exposed and flush with the side of the lower mold core (211). The third insert (214) is used to be injection molded into the inner fastener (14) of the plastic frame (1103). The lower mold core (211) is provided with a through hole for the first insert (212) and the third insert (214) to extend downward; the lower mold base (21) is provided with a first ejector plate (215), and the first insert (212) and the third insert (214) both extend downward and are fixed to the first ejector plate (215).

7. The injection mold according to claim 4 or 5, characterized in that, The side slides include a front slide (216) that is movable in front of the lower mold core (211), a rear slide (217) that is movable behind the lower mold core (211), a left slide (218) that is movable to the left of the lower mold core (211), and a right slide (219) that is movable to the right of the lower mold core (211). The front sliding body (216), the rear sliding body (217), the left sliding body (218) and the right sliding body (219) all have a first inclined surface (2101) and a first inclined driving hole (2102). The upper mold base (22) is provided with a second inclined surface (223) that can abut against the first inclined surface (2101) and a first inclined drive rod (224) for insertion into the first inclined drive hole (2102).

8. The injection mold according to claim 4, characterized in that, The upper mold base (22) is provided with a glue injection port (225) and a runner plate (226). The glue injection port (225) is connected to the runner plate (226) through the main runner. The runner plate (226) is provided with a hot nozzle (227), and the upper surface of the lower mold core (211) is provided with a branch runner (2103) connected to the hot nozzle (227). The branch runner (2103) is connected to the first molding cavity (2001) and / or the second molding cavity.

9. An injection molding method for an injection mold, applied to the injection mold according to any one of claims 3-8, characterized in that, Injection molding methods include Step 1: Provide an injection mold (200), assemble the injection mold (200) into the injection molding machine, and connect the upper mold base (22) to the mold closing control system of the injection molding machine; Step 2: The mold closing control system drives the upper mold base (22) to move upward relative to the lower mold base (21), so that the upper mold base (22) and the lower mold base (21) open the mold and expose the upper mold core (221) and the lower mold core (211). Step 3: Provide a release agent and spray it onto the surface of the mounting notch (213) and the surface of the floating metal mounting piece (13) that does not participate in the inlay molding; Step 4: Insert the floating metal mounting piece (13) into the mounting notch (213), and drive the upper mold base (22) to move downward relative to the lower mold base (21) to complete the mold closing between the upper mold base (22) and the lower mold base (21); the second forming protrusion (2221) of the second insert (222) abuts against the side of the floating metal mounting piece (13) and the first limiting post (131); Step 5: The upper mold base (22) simultaneously drives the front slide (216), the rear slide (217), the left slide (218), and the right slide (219) to move closer to the lower mold core (211); after the upper mold base (22) and the lower mold base (21) are closed, they form the first molding cavity (2001) and the second molding cavity (2002). Step 6: TPU hot melt plastic paste is supplied through the injection system of the injection molding machine. The TPU hot melt plastic paste is injected into the first molding cavity (2001) and the second molding cavity (2002) through the injection port (225), the runner plate (226), the hot nozzle (227) and the branch runner (2103). The TPU hot melt plastic paste is cooled for 20-60 seconds by the cooling system of the injection mold (200) to solidify and form the mobile phone plastic frame (100). Step 7: The mold closing control system drives the upper mold base (22) to move upward relative to the lower mold base (21), so that the upper mold base (22) and the lower mold base (21) open the mold; during the process of the upper mold base (22) moving upward relative to the lower mold base (21) to open the mold, the front slide (216), the rear slide (217), the left slide (218) and the right slide (219) move away from the lower mold core (211) in a synchronous linkage, so that the front slide (216), the rear slide (217), the left slide (218), the right slide (219), the upper mold core (221) and the second insert (222) are demolded from the middle frame body (11) and the floating metal mounting plate (13); Step 8: The ejection control system drives the first ejector plate (215) to move upward. The first ejector plate (215) moves the first insert (212) and the third insert (214) upward relative to the lower mold core (211) in conjunction with each other, so that the middle frame body (11) is demolded from the first insert (212), the third insert (214) and the lower mold core (211) and the material is unloaded. Step 9, repeat steps 2-8 to continue injection molding the mobile phone plastic frame (100) containing the floating metal mounting piece (13).

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