Manufacturing method of integrated injection molding middle frame of smart phone

Abstract

The invention relates to the technical field of mobile phone middle frames, and particularly discloses a manufacturing method of an integrated injection molding middle frame of a smart phone, which comprises the following steps: S1, injecting a molten or powdery metal material into a cavity of a first module for die-casting molding to obtain a middle plate shell; s2, the middle plate shell obtained through pressure casting is put into a cavity of a second mold, a molten or powdery plastic material is injected into the cavity of the second mold for injection molding, and a frame shell wrapping the edge of the middle plate shell is obtained; the frame shell and the middle plate shell are of an integrated structure, the frame shell and the middle plate shell form an integrated injection molding middle frame shell, and the middle plate shell is used for bearing the touch display screen and various electronic elements; compared with a traditional split combined structure, the problems of large segment difference and large gap caused by fit tolerance difference existing in split assembly are solved, and the middle frame shell is more stable in structure and more exquisite in appearance.

Description

Technical Field

[0001] The present invention relates to the technical field of mobile phone middle frames, and in particular to a method for manufacturing an integrated injection-molded middle frame of a smart phone. Background Art

[0002] With the rapid development of society, people's living standards have improved while technology has also been significantly improved. The most outstanding performance is the replacement of smartphones. Smartphones have gradually developed from the initial communication tools to personal smart terminals that integrate multiple functions such as communication, entertainment, and work. Smartphones have become an important tool for storing and analyzing data. With the support of built-in sensors and other devices, the dataization of physical status and behavioral activities has become a common phenomenon in modern society. The next generation of communication tools will continue and upgrade this important function, providing individuals with deeper, more comprehensive, and smarter metering services. Smartphones have gradually become an indispensable part of modern life.

[0003] However, there are still many problems in the production and manufacturing process of mobile phones. Take the middle frame of mobile phones as an example. In the past, most of the middle frame structures of mobile phones were formed by a split combination of front and rear shells. The split assembly has differences in matching tolerances, resulting in large step differences and large gaps. This has a certain impact on the functional stability and appearance of the product, and it is difficult to meet consumers' growing mobile phone usage experience. Summary of the invention

[0004] The purpose of the present invention is to provide a mobile phone middle frame injection molding technology in a mold, so as to integrate the traditional front and rear shell split structures into an integrated molding structure, achieve the effect of making the mobile phone lighter and thinner, and having a refined appearance, and meet consumers' high aesthetic requirements for mobile phones.

[0005] To achieve the above object, a method for manufacturing an integrated injection-molded middle frame of a smart phone according to the present invention is characterized in that the manufacturing method comprises the following steps:

[0006] S1, injecting molten or powdered metal material into the cavity of the first die set for die casting to obtain a middle plate shell;

[0007] S2. Place the die-cast middle plate shell into the cavity of the second mold, inject the molten or powdered plastic material into the cavity of the second mold for injection molding, and obtain a frame shell covering the edge of the middle plate shell; the frame shell and the middle plate shell are an integrated structure, and the frame shell and the middle plate shell constitute an integrated injection-molded middle frame, and the middle plate shell is used to carry the touch display screen and various electronic components. First, the middle plate shell is die-casted by the first mold, and the middle plate shell is placed in the cavity of the second mold, and then the frame shell covering the edge of the middle plate shell is injection-molded by the second mold, and the frame shell and the middle plate shell constitute an integrated injection-molded middle frame shell; compared with the traditional split assembly structure, the present invention avoids the problems of large step difference and large gap caused by the difference in matching tolerances in the split assembly, making the middle frame shell structure more stable and more exquisite in appearance.

[0008] Further, in step S1, the middle plate shell is formed with a main board surface for carrying a variety of electronic components, a blind groove for accommodating battery panels and / or electronic components is opened on the main board surface, and a strip-shaped through-hole penetrating the bottom wall of the blind groove is also opened on the main board surface to facilitate the removal of objects in the blind groove.

[0009] Further, in step S1, a positioning through hole and a positioning blind hole are formed on the side wall of the accommodating blind groove of the middle plate shell, the positioning through hole passes through the side wall of the accommodating blind groove, and the positioning blind hole does not pass through the side wall of the accommodating blind groove; in step S2, a first positioning member located in the positioning through hole and a second positioning member located in the positioning blind hole are formed on the frame shell, the first positioning member cooperates with the positioning through hole, and the second positioning member cooperates with the positioning blind hole, and the first positioning member and the second positioning member are used to prevent the frame shell and the middle plate shell from separating from each other in a direction parallel to the main board surface.

[0010] Further, in step S1, a positioning blind groove is formed on the main board surface of the middle plate shell, a positioning through hole and a positioning boss are formed in the positioning blind groove, the positioning through hole passes through the bottom wall of the positioning blind groove, and the positioning boss protrudes from the bottom wall of the positioning blind groove; in step S2, a loading platform for carrying electronic components is formed in the positioning blind groove of the frame shell, the loading platform is formed with a positioning column protruding into the positioning through hole and a positioning through hole for accommodating the positioning boss, the positioning boss cooperates with the positioning through hole, the positioning column cooperates with the positioning through hole, and the positioning boss and the positioning column are used to prevent the middle plate shell and the frame shell from separating from each other in a direction parallel to the main board surface.

[0011] Furthermore, in step S1, an antenna slot is formed on the middle plate shell, and the antenna slot is formed by being recessed from a side wall of the accommodating blind slot near the accommodating blind slot, and the antenna slot is connected to the accommodating blind slot. By providing the antenna slot, the mobile phone antenna can be accommodated in the antenna slot, and because the antenna slot is provided on the side wall of the accommodating blind slot, the antenna slot is hidden in the side wall of the accommodating blind slot, thereby preventing the maintenance worker from accidentally tearing off the antenna during the maintenance of the mobile phone.

[0012] Furthermore, the positioning column has a column body connected to the bottom wall of the positioning blind groove and a cover head arranged on the bottom wall of the column body away from the positioning blind groove. The outer diameter of the cover head is larger than the outer diameter of the column body. The cover head and the column body are both located in the positioning through hole. The cover head is used to clamp the positioning blind groove with the bottom wall of the stage. The positioning column is used to prevent the middle plate shell and the frame shell from separating from each other in a direction perpendicular to the main board surface.

[0013] Further, in step S1, the middle plate shell is formed with a limiting perforation and a limiting blind groove, the limiting perforation passes through the middle plate shell, and the limiting blind groove does not pass through the middle plate shell; in step S2, the frame shell is formed with a first limiting member located at the limiting perforation and a second limiting member located at the limiting blind groove, the first limiting member and the second limiting member extend outward from the frame shell to form a fan-shaped structure that gradually widens, the first limiting member cooperates with the limiting perforation, and the second limiting member cooperates with the limiting blind hole, and the first limiting member and the second limiting member are used to prevent the middle plate shell and the frame shell from separating from each other in a direction parallel to the main board surface.

[0014] Further, in step S1, the middle plate shell is formed around the edge of the main board surface, and the edge is provided with a speaker, a charging port, a phone card slot, a power button port, a volume adjustment button port and a wired headphone interface; in step S2, the frame shell is formed with a accommodating cavity covering the edge.

[0015] Further, after step S2, the frame shell is CNC processed to obtain a second through hole corresponding to and connected to the speaker port, charging port, phone card slot, power button port, volume adjustment button port and wired headphone port, and the second through hole is connected to the accommodating cavity.

[0016] Further, in step S1, the middle plate shell is also formed with a screen-carrying surface which is away from the main board surface, and both the main board surface and the screen-carrying surface are provided with limiting blind grooves. The middle plate shell is provided with at least two limiting blind grooves which are respectively located on the main board surface and the screen-carrying surface, and the frame shell has at least two second limiting members for clamping the middle plate shell. The two second limiting members for clamping the middle plate shell are used to prevent the middle plate shell and the frame shell from separating from each other in a direction perpendicular to the main board surface.

[0017] Beneficial effects of the present invention: A method for manufacturing an integrated injection-molded middle frame of a smart phone of the present invention, firstly, a middle plate shell is die-casted by a first mold, the middle plate shell is placed in a mold cavity of a second mold, and then a frame shell covering the edge of the middle plate shell is injection-molded by the second mold, the frame shell and the middle plate shell constitute an integrated injection-molded middle frame; compared with the traditional split-combination structure, the present invention avoids the problems of large step difference and large gap caused by the matching tolerance difference in the split assembly, so that the middle frame shell structure is more stable and the appearance is more exquisite. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a front structural schematic diagram of the present invention;

[0019] Figure 2 A perspective schematic diagram of the decomposed structure of the present invention;

[0020] Figure 3 It is another perspective schematic diagram of the decomposed structure of the present invention;

[0021] Figure 4 It is a side structural schematic diagram of the present invention;

[0022] Figure 5 for Figure 2 A schematic diagram of the structure at A;

[0023] Figure 6 for Figure 2 Schematic diagram of the structure at B;

[0024] Figure 7 for Figure 3 Schematic diagram of the structure at C;

[0025] Figure 8 It is a schematic diagram of the three-dimensional structure of the middle plate shell of the present invention;

[0026] Fig. 9 It is a front structural schematic diagram of the frame shell of the present invention;

[0027] Fig.10 for Fig. 9 A partial schematic diagram of the cross section at AA;

[0028] Fig.11 It is a schematic diagram of the three-dimensional structure of the frame shell of the present invention after CNC processing.

[0029] Reference numerals include:

[0030] 1. Middle frame shell; 2. Middle plate shell; 3. Frame shell; 201. Accommodating blind groove; 202. Strip perforation; 203. Positioning through hole; 204. Positioning blind hole; 205. Positioning blind groove; 206. Positioning through hole; 207. Positioning boss; 208. Antenna slot; 209. Limiting perforation; 210. Limiting blind groove; 211. Edge; 301. First positioning member; 302. Second positioning member; 303. Stage; 304. Positioning column; 305. Positioning perforation; 306. First limiting member; 307. Second limiting member; 308. Accommodating cavity; 309. Second through hole; 310. Accommodating groove; 311. Curved portion. DETAILED DESCRIPTION

[0031] In order to facilitate the understanding of those skilled in the art, the embodiments of the present invention are further described below in conjunction with the embodiments and drawings. The contents mentioned in the implementation modes are not limitations of the present invention.

[0032] See also Figures 1 to 11 As shown, the manufacturing method of the one-piece injection-molded middle frame of the present invention is characterized in that the manufacturing method comprises the following steps:

[0033] S. Injecting the molten or powdered middle plate shell 2 material into the cavity of the first die set for die casting to obtain the middle plate shell 2;

[0034] S. Place the die-cast middle plate shell 2 into the cavity of the second mold, inject the molten or powdered frame shell 3 material into the cavity of the second mold for injection molding, and obtain the frame shell 3 covering the edge of the middle plate shell 2; the frame shell 3 and the middle plate shell 2 are an integrated structure, and the frame shell 3 and the middle plate shell 2 constitute an integrated injection-molded middle frame shell 1, and the middle plate shell 2 is used to carry the touch display screen and various electronic components.

[0035] In this embodiment, the one-piece molded middle frame is first formed into a middle plate shell 2 by a die-casting process, and then the frame shell 3 is formed on the edge of the middle plate shell 2 by an injection molding process. The material of the middle plate shell 2 is generally an aluminum alloy material, and the material of the frame shell 3 is generally an engineering plastic. In actual production and manufacturing, the production technician first injects the molten aluminum alloy into the cavity of the first mold to directly mold, so as to obtain the aluminum alloy middle plate shell 2, and then fixes the molded middle plate shell 2 in the cavity of the second mold, and then injects the molten plastic material into the cavity of the second mold. The plastic material surrounds the middle plate shell 2 and is partially embedded in the edge of the middle plate shell 2 to form, so as to obtain the frame shell 3 coated on the edge of the middle plate shell 2. The material composition and proportion of the frame shell 3 can be 60% polycarbonate (PC), 23% nylon, 15% thermoplastic elastomer and 2% additives (such as: flame retardant, reinforcing agent, lubricant, etc.). Polycarbonate has high strength, high toughness, good heat resistance and dimensional stability, and can be used as the main material of the mobile phone frame shell 3; nylon has excellent wear resistance, oil resistance and chemical corrosion resistance, and using it as a component material of the mobile phone frame shell 3 can enhance the wear resistance, oil resistance and chemical corrosion resistance of the frame shell 3; thermoplastic elastomer has good elasticity and softness, and provides a comfortable hand feel, and this material can increase the impact resistance and anti-slip performance of the mobile phone frame shell 3. Production technicians can select appropriate material costs and proportions according to the material performance, cost, processing technology, and environmental protection requirements to manufacture a frame shell 3 that meets the requirements.

[0036] In the traditional split-and-assembled structure, a plurality of independently arranged frame shells 3 and middle plate shells 2 are manufactured through a plurality of molds, and then the plurality of frame shells 3 and middle plate shells 2 are combined and connected into a middle frame shell 1. The production process has the problems of complex process, assembly errors, unstable structure and high production cost. In comparison, the present invention uses a first mold and a second mold to successively produce a middle frame shell 1 with a middle plate shell 2 and a frame shell 3 integrally formed through a die-casting process and an injection molding process, thereby avoiding the problems of large step difference and large gap caused by the difference in fitting tolerance in the split-type assembly, so that the structure of the middle frame shell 1 is more stable, the appearance is more exquisite and the production cost is lower.

[0037] Specifically, in step S1, the middle plate shell 2 is formed with a main board surface for carrying a variety of electronic components, and a blind groove 201 for accommodating battery panels and / or electronic components is opened on the main board surface. A strip through hole 202 is also opened on the main board surface and passes through the bottom wall of the blind groove 201 to facilitate the removal of objects in the blind groove 201.

[0038] In this embodiment, the battery panel and other electronic components supporting the battery panel are usually installed and placed in the accommodating blind groove 201. Since the accommodating blind groove 201 just accommodates the battery panel, it is easy to damage the battery panel by directly buckling it out during the process of repairing and disassembling the battery panel, so a strip-shaped perforation 202 that penetrates the bottom wall is specially provided on the bottom wall of the accommodating blind groove 201. In actual use, the maintenance personnel can use their fingers or other flexible rods from the back of the accommodating blind groove 201 through the strip-shaped perforation 202 through the bottom wall of the accommodating blind groove 201 to lift up the battery panel in the accommodating blind groove 201, thereby realizing the removal of the battery panel. The strip-shaped perforation 202 has the advantage of being convenient for users to remove objects in the accommodating blind groove 201.

[0039] The blind accommodating groove 201 can also accommodate an integrated circuit board composed of a battery panel and various electronic components. The screen-carrying surface on the side away from the main board surface of the middle board housing 2 is also provided with various electronic components. The strip-shaped perforations 202 can serve as a communication channel between the main board surface and the electronic components on the screen-carrying surface. The bottom wall of the blind accommodating groove 201 is provided with a plurality of bosses, which lift the blind accommodating groove 201 away from the bottom wall of the blind accommodating groove 201, which is conducive to better heat dissipation effect of the battery panel and / or various electronic components in the blind accommodating groove 201.

[0040] Specifically, in step S1, a positioning through hole 203 and a positioning blind hole 204 are formed on the side wall of the accommodating blind groove 201 of the middle plate shell 2, the positioning through hole 203 penetrates the side wall of the accommodating blind groove 201, and the positioning blind hole 204 does not penetrate the side wall of the accommodating blind groove 201; in step S2, a first positioning member 301 located in the positioning through hole 203 and a second positioning member 302 located in the positioning blind hole 204 are formed on the frame shell 3, the first positioning member 301 cooperates with the positioning through hole 203, and the second positioning member 302 cooperates with the positioning blind hole 204, and the first positioning member 301 and the second positioning member 302 are used to prevent the frame shell 3 and the middle plate shell 2 from separating from each other in a direction parallel to the main board surface.

[0041] In this embodiment, a plurality of positioning through holes 203 and positioning blind holes 204 are arranged on the side wall of the accommodating blind groove 201, and the first mold has a chamber for forming the plurality of positioning through holes 203 and positioning blind holes 204; the material liquid of the frame shell 3 flows into the positioning through holes 203 and positioning blind holes 204, and the first positioning member 301 and the second positioning member 302 that match with the positioning through holes 203 and positioning blind holes 204 are directly formed in the positioning through holes 203 and positioning blind holes 204, so that the frame shell 3 is tightly connected with the middle plate shell 2. The first positioning member 301 and the second positioning member 302 are used to prevent the middle plate shell 2 and the frame shell 3 from being separated from each other along the left-right, front-back direction or other directions parallel to the main board surface, and have the function of improving the structural stability of the middle frame shell 1.

[0042] Specifically, in step S1, a positioning blind groove 205 is formed on the main board surface of the middle plate shell 2, and a positioning through hole 206 and a positioning boss 207 are formed in the positioning blind groove 205. The positioning through hole 206 passes through the bottom wall of the positioning blind groove 205, and the positioning boss 207 protrudes from the bottom wall of the positioning blind groove 205; in step S2, a loading platform 303 for carrying electronic components is formed in the positioning blind groove 205 of the frame shell 3, and the loading platform 303 is formed with a positioning column 304 protruding into the positioning through hole 206 and a positioning through hole 305 for accommodating the positioning boss 207, the positioning boss 207 cooperates with the positioning through hole 305, and the positioning column 304 cooperates with the positioning through hole 206, and the positioning boss 207 and the positioning column 304 are used to prevent the middle plate shell 2 and the frame shell 3 from separating from each other in a direction parallel to the main board surface.

[0043] In this embodiment, the stage 303 is formed in a cavity formed by the groove chamber of the self-positioning blind groove 205 and the cavity of the second mold. During actual production, the frame shell 3 material liquid flows into the groove chamber of the positioning blind groove 205, and the frame shell 3 material liquid surrounds the positioning boss 207 to form a positioning through hole 305 for accommodating the positioning boss 207. The frame shell 3 material liquid flows into the positioning through hole 206 to form a positioning column 304 accommodated in the positioning through hole 206. The stage 303 forms a board structure for carrying electronic components in the cavity formed by the groove chamber of the self-positioning blind groove 205 and the cavity of the second mold. The positioning boss 207 and the positioning column 304 are respectively matched with the positioning through hole 305 and the positioning through hole 206. The positioning boss 207 and the positioning column 304 are used to prevent the middle plate shell 2 and the frame shell 3 from separating from each other along the left and right, front and back or other directions parallel to the main board surface. The positioning boss 207 and the positioning column 304 have the function of improving the structural stability of the middle frame shell 1.

[0044] The stage 303 can also be formed into a boss structure protruding out of the positioning blind groove 205 through step S1, and then formed into a slot structure for accommodating electronic components through CNC processing in the later stage. The production technicians can select the appropriate process flow and steps by comparing the production cost and production cycle of making the second mold to form the cavity of the stage 303 and the later CNC processing of the stage 303.

[0045] Specifically, in step S1 , an antenna slot 208 is further formed on the middle plate shell 2 , and the antenna slot 208 is recessed from a side wall of the accommodating blind slot 201 close to a side of the accommodating blind slot 201 , and the antenna slot 208 is connected to the accommodating blind slot 201 .

[0046] In this embodiment, the cross section of the antenna slot 208 is an arc groove structure, and a high-frequency connection line is arranged inside the antenna slot 208. The mobile phone is mainly equipped with a cellular communication antenna, a Wi-Fi and Bluetooth antenna, a GPS antenna and an NFC antenna. The high-frequency connection line is used to transmit high-frequency signals. In mobile phones and other communication devices, it can connect the cellular communication antenna with components such as a radio frequency module and a baseband processor to achieve model transmission and processing. Different from the traditional antenna slot 208 being arranged on the side wall of the accommodating blind slot 201 and the side adjacent to the accommodating blind slot 201, so that the high-frequency connection line is exposed on the middle plate shell 2, the antenna slot 208 of the present invention is arranged on the side wall of the first notch, so that the high-frequency connection line is hidden in the side wall of the accommodating blind slot 201, so as to avoid accidental damage to the high-frequency connection line when the maintenance personnel pry open the shell during the maintenance of the mobile phone. Since the high-frequency connection line is usually arranged on the side of the battery panel, if the high-frequency connection line is damaged and needs to be replaced, the maintenance personnel can first disassemble the battery panel and then replace the damaged high-frequency connection line, which will not cause maintenance difficulties. By setting the antenna slot 208, the mobile phone antenna can be accommodated in the antenna slot 208. Since the antenna slot 208 is set on the side wall of the accommodating blind slot 201, the antenna slot 208 is hidden in the side wall of the accommodating blind slot 201, thereby preventing the maintenance worker from accidentally tearing off the antenna during the maintenance of the mobile phone.

[0047] Cellular communication antennas, Wi-Fi and Bluetooth antennas, and NFC antennas can realize antenna functions by printing metal lines in specific areas on the mobile phone motherboard, or by installing cellular communication antennas, Wi-Fi and Bluetooth antennas, and NFC antennas made of flexible materials in specific areas inside the mobile phone housing by pasting or welding; GPS antennas are generally considered to be away from metal parts, batteries and other components that may cause interference, while also taking into account the layout and structure of the internal space of the mobile phone to ensure that the antenna can receive satellite signals well. For example, some mobile phones will install the GPS antenna at the top or bottom edge of the phone. Fix the antenna to the motherboard by welding or snapping. Welding can provide a more stable connection, but it has higher requirements for welding technology; snapping is easy to install and disassemble, but it may become loose during long-term use.

[0048] The cellular communication antenna, Wi-Fi and Bluetooth antenna, GPS antenna and NFC antenna can also be integrally formed with the frame shell 3 by injection molding on the frame shell 3, and the frame shell 3 is provided with a receiving groove for accommodating the cellular communication antenna, Wi-Fi and Bluetooth antenna, GPS antenna and / or NFC antenna. Taking the GPS antenna as an example, but not limited to the GPS antenna, the GPS antenna is molded in the receiving groove by a precision injection molding process, and the GPS antenna is integrally formed with the frame shell 3. Injection molding the GPS antenna on the mobile phone shell can make the overall design of the mobile phone more concise and beautiful, and there will be no protruding GPS antenna part affecting the appearance of the mobile phone. On the other hand, through reasonable design and injection molding process, the stability of the antenna performance can be ensured, so that it can effectively receive GPS signals.

[0049] Specifically, the positioning column 304 has a column connected to the bottom wall of the positioning blind groove 205 and a cap disposed on the bottom wall of the column away from the positioning blind groove 205. The outer diameter of the cap is greater than the outer diameter of the column. The cap and the column are both located in the positioning through hole 206. The cap is used to clamp the positioning blind groove 205 with the bottom wall of the stage 303. The positioning column 304 is used to prevent the middle plate shell 2 and the frame shell 3 from separating from each other in a direction perpendicular to the main board surface. In this embodiment, the positioning column 304 is formed by protruding from the bottom wall of the stage 303. The cap of the positioning column 304 and the bottom wall of the stage 303 form a state of clamping the positioning blind groove 205, which is conducive to making the connection between the positioning blind groove 205 and the stage 303 more stable. The positioning column 304 is used to prevent the middle plate shell 2 and the frame shell 3 from separating from each other in a direction perpendicular to the main board surface. The positioning column 304 has the function of improving the structural stability of the middle frame shell 1.

[0050] The positioning blind groove 205 and the stage 303 can also be firmly connected by screw connection, but because the thickness of the positioning blind groove 205 is 0.4-0.93mm and the thickness of the stage 303 is 0.4-0.95mm, finer precision screws are used. Production technicians first process a tapered hole that passes through the stage 303 on the stage 303 through CNC drilling and tapping. The tapered hole is used to accommodate the screw head of the precision screw so that the screw head does not protrude from the inner side of the bottom wall of the stage 303; then a thread hole that passes through the positioning blind groove 205 is set on the positioning blind groove 205, and the tapered hole is connected to the thread hole, and the thread hole cooperates with the precision screw rod. Production technicians can choose a suitable connection method according to the cost and connection strength of the process flow of using screws to connect and using positioning columns 304 to connect.

[0051] Specifically, in step S1, the middle plate shell 2 is formed with a limiting perforation 209 and a limiting blind groove 210, the limiting perforation 209 passes through the middle plate shell 2, and the limiting blind groove 210 does not pass through the middle plate shell 2; in step S2, the frame shell 3 is formed with a first limiting piece 306 located at the limiting perforation 209 and a second limiting piece 307 located at the limiting blind groove 210, the first limiting piece 306 and the second limiting piece 307 extend outward from the frame shell 3 to form a fan-shaped structure that gradually widens, the first limiting piece 306 cooperates with the limiting perforation 209, and the second limiting piece 307 cooperates with the limiting blind hole, the first limiting piece 306 and the second limiting piece 307 are used to prevent the middle plate shell 2 and the frame shell 3 from separating from each other in a direction parallel to the main board surface. In this embodiment, a plurality of limiting perforations 209 and limiting blind grooves 210 are formed on the middle plate housing 2, and the limiting perforations 209 and limiting blind grooves 210 have a fan-shaped groove structure that matches with the first limiting member 306 and the second limiting member 307. By setting the limiting perforations 209 to match with the first limiting member 306, and the limiting blind grooves 210 to match with the second limiting member 307, the middle plate housing 2 and the frame housing 3 are separated from each other in a direction parallel to the main board surface, and are not easy to separate. The first limiting member 306 and the second limiting member 307 have the function of improving the structural stability of the middle frame housing 1.

[0052] If the middle plate shell 2 and the frame shell 3 are connected by the traditional split combination, the limiting perforation 209 and the first limiting member 306 and / or the limiting blind groove 210 and the second limiting member 307 are connected by the installation combination, and there is a gap between the limiting perforation 209 and the first limiting member 306 and / or the limiting blind groove 210 and the second limiting member 307 due to the matching tolerance, when the mobile phone middle frame shell 1 is subjected to external impact, the middle plate shell 2 and the frame shell 3 will be offset, seriously affecting the stability of the structure. Compared with the traditional split combination, the structure of the mobile phone middle frame shell 1 has the advantages of structural stability and strong resistance to rate.

[0053] Specifically, in step S1, the middle plate shell 2 is formed with an edge portion 211 surrounding the main plate surface, and the edge portion 211 is provided with a speaker, a charging port, a phone card slot, a power button, a volume adjustment button, and a wired headphone interface; in step S2, the frame shell 3 is formed with a receiving cavity 308 covering the edge portion 211. In this embodiment, corresponding electronic components are arranged on the middle plate shell 2 at positions corresponding to the speaker, the charging port, the phone card slot, the power button, the volume adjustment button, and the wired headphone interface. For example, an audio amplifier, an audio filter, and an electromagnetic shielding element are installed corresponding to the speaker; a micro switch or a touch switch, a connecting cable or a flexible circuit board, a capacitor and a resistor, a diode, etc. are installed corresponding to the power button.

[0054] The speaker, charging port, phone card slot, power button, volume adjustment button and wired headphone interface structure can be formed by injection molding or by post-processing. If the speaker, charging port, phone card slot, power button, volume adjustment button and wired headphone interface are formed by post-processing, the production technician clamps the middle frame shell 1 on the machine tool and uses different tool heads to turn the speaker, charging port, phone card slot, power button, volume adjustment button and wired headphone interface structure on the middle plate shell 2. If the speaker, charging port, phone card slot, power button, volume adjustment button and wired headphone interface structure are formed by injection molding, their structure can be directly solidified in the mold cavity. Preferably, the speaker, charging port, phone card slot, power button, volume adjustment button and wired headphone interface structure are formed by injection molding, which effectively reduces the CNC processing time, shortens the production cycle and reduces the production cost.

[0055] Specifically, after step S2, the frame housing 3 is CNC processed to obtain a second through hole 309 corresponding to and connected to the speaker, charging port, phone card slot, power button, volume adjustment button, and wired headphone interface, and the second through hole 309 is connected to the accommodating cavity 308. During actual production and manufacturing, the production technicians use a CNC machine tool to turn the second through hole 309 corresponding to the speaker, charging port, phone card slot, power button, volume adjustment button, and wired headphone interface on the frame housing 3, and the second through hole 309 reveals the speaker, charging port, phone card slot, power button, volume adjustment button, and wired headphone interface.

[0056] Before the CNC processing is completed, the middle frame shell 1 can also be subjected to the step of nozzle cutting. During the die-casting or injection molding process, the molten metal liquid is injected into the mold cavity through the runner system. The runner system includes parts such as the sprue, the cross runner and the inner gate. When the molten metal fills the cavity and cools and solidifies, the metal in these runner systems will form excess nozzle material. During actual production and manufacturing, the shell embryo obtained by injection molding by the production technician is placed in a punching machine for punching and cutting, which can remove the excess part of the middle frame shell 1, avoid defects, and help improve the appearance quality of the product.

[0057] After the slitting and CNC processing steps are completed, turning burrs and sharp edges are inevitably generated on the middle plate shell 2 and the frame shell 3. Therefore, the middle frame shell 1 needs to be desharpened, ground and polished, and then the middle frame shell 1 is placed in a cleaning tank to clean the turning chips, and then dried with the help of a blower.

[0058] Specifically, in step S1, the middle plate shell 2 is also formed with a screen-carrying surface which is away from the main board surface, and both the main board surface and the screen-carrying surface are provided with limiting blind grooves 210. The middle plate shell 2 is provided with at least two limiting blind grooves 210 respectively located on the main board surface and the screen-carrying surface, and the frame shell 3 has at least two second limiting members 307 for clamping the middle plate shell 2. The two second limiting members 307 for clamping the middle plate shell 2 are used to prevent the middle plate shell 2 and the frame shell 3 from separating from each other in a direction perpendicular to the main board surface. In this embodiment, the middle plate housing 2 is provided with a plurality of limiting blind grooves 210, and the plurality of limiting blind grooves 210 are distributed on the main board surface and the screen-carrying surface, and two limiting blind grooves 210 respectively provided on the main board surface and the screen-carrying surface are a group of limiting blind grooves 210. The middle plate housing 2 is provided with a plurality of groups of limiting blind grooves 210, and the frame housing 3 matched therewith is provided with a plurality of groups of second limiting members 307, and the plurality of groups of second limiting members 307 clamp the middle plate housing 2 to prevent the middle plate housing 2 and the frame housing 3 from being separated from each other in a direction perpendicular to the main board surface. The second limiting members 307 clamp the middle plate housing 2 to improve the structural stability of the middle frame housing 1.

[0059] In this embodiment, the middle plate housing 2 is provided with a plurality of positioning blind holes 204 respectively located on the main board surface and the screen-carrying surface, and two positioning blind holes 204 respectively provided on the main board surface and the screen-carrying surface are a group of positioning blind holes 204. The middle plate housing 2 is provided with a plurality of groups of positioning blind holes 204, and the frame housing 3 matched therewith is provided with a plurality of groups of second positioning members 302. The plurality of groups of second positioning members 302 clamp the middle plate housing 2 to prevent the middle plate housing 2 and the frame housing 3 from being separated from each other in a direction perpendicular to the main board surface. The second positioning members 302 clamp the middle plate housing 2 to improve the structural stability of the middle frame housing 1.

[0060] In step S1, the middle plate shell 2 is provided with curved surface parts 311 on both sides of the screen-carrying surface, and the curved surface parts 311 are formed from the connection between the middle plate shell 2 and the frame shell 3, and the curved surface parts 311 are in a curved structure. In this embodiment, the left and right sides of the middle plate shell 2 are provided with curved surface parts 311, and the thickness of the frame shell 3 on the left and right sides is less than the thickness of the middle plate shell 2, and the frame shell 3 exposes the curved surface parts 311. The curved surface parts 311 are formed in the cavity of the first mold by the injection molding process, which can effectively reduce the processing steps, shorten the production cycle and reduce the production cost; and can also make the accuracy of removing the curved surface parts 311 more accurate. The curved surface parts 311 carry the touch screen, and the frame shell 3 exposes the curved surface parts 311, so that the touch screen is exposed on the side. Compared with the traditional mobile phone composed of the middle plate shell 2 formed by the side of the frame shell 3 completely covering the middle plate shell 2, the screen ratio of the mobile phone is higher, the user will have a better sense of immersion when using it, and the appearance design is more beautiful.

[0061] In this embodiment, the frame shell 3 is provided with a receiving groove 310, and the receiving groove 310 is formed by a concave arrangement on the outer surface of the frame shell 3. The receiving groove 310 cooperates with the edge of the touch screen and / or the mobile phone shell, and the receiving groove 310 is used to limit the movement of the touch screen and / or the mobile phone shell. In this embodiment, the frame shell 3 is provided with receiving grooves 310 on both the front and back sides. The receiving groove 310 arranged on the front side of the frame shell 3 cooperates with the edge of the mobile phone shell, and the receiving groove 310 on the back side of the frame shell 3 cooperates with the edge of the touch screen. The frame shell 3 surrounds the mobile phone shell to limit the movement of the mobile phone shell. During actual installation, a layer of adhesive will be applied to the receiving groove 310 first, and then the touch screen and / or the mobile phone shell will be placed in the receiving groove 310. The receiving groove 310 is integrally formed with the frame shell 3 or the middle frame shell 1, or formed by CNC processing in the later stage. Production technicians can choose a suitable process by considering cost and convenience.

[0062] The above contents are only preferred embodiments of the present invention. For ordinary technicians in this field, according to the concept of the present invention, there will be changes in the specific implementation methods and application scopes. The content of this specification should not be understood as limiting the present invention.

Claims

1. A method for manufacturing an integrated injection-molded middle frame of a smart phone, characterized in that: The manufacturing method comprises the following steps: S1, injecting molten or powdered metal material into the cavity of the first die set for die casting to obtain a middle plate shell (2); S2. Place the die-cast middle plate shell (2) into the mold cavity of the second mold, inject molten or powdered plastic material into the mold cavity of the second mold for injection molding, and obtain a frame shell (3) covering the edge of the middle plate shell (2); the frame shell (3) and the middle plate shell (2) are an integrated structure, and the frame shell (3) and the middle plate shell (2) constitute an integrated injection-molded middle frame shell (1), and the middle plate shell (2) is used to carry a touch display screen and various electronic components.

2. The method for manufacturing a smart phone integral injection-molded middle frame according to claim 1, characterized in that: In step S1, the middle plate shell (2) is formed with a main plate surface for carrying a variety of electronic components, a blind groove (201) for accommodating a battery panel and / or an electronic component is provided on the main plate surface, and a strip-shaped through hole (202) penetrating the bottom wall of the blind groove (201) is also provided on the main plate surface to facilitate the removal of objects in the blind groove (201).

3. The method for manufacturing a smart phone integral injection-molded middle frame according to claim 2, characterized in that: In step S1, a positioning through hole (203) and a positioning blind hole (204) are formed on the side wall of the accommodating blind groove (201) of the middle plate shell (2), the positioning through hole (203) passes through the side wall of the accommodating blind groove (201), and the positioning blind hole (204) does not pass through the side wall of the accommodating blind groove (201); in step S2, a first positioning member (301) located in the positioning through hole (203) and a second positioning member (302) located in the positioning blind hole (204) are formed on the frame shell (3), the first positioning member (301) cooperates with the positioning through hole (203), and the second positioning member (302) cooperates with the positioning blind hole (204), and the first positioning member (301) and the second positioning member (302) are used to prevent the frame shell (3) and the middle plate shell (2) from separating from each other in a direction parallel to the main board surface.

4. The method for manufacturing a one-piece injection-molded middle frame of a smart phone according to claim 2, characterized in that: In step S1, a positioning blind groove (205) is formed on the main plate surface of the middle plate housing (2), a positioning through hole (206) and a positioning boss (207) are formed in the positioning blind groove (205), the positioning through hole (206) passes through the bottom wall of the positioning blind groove (205), and the positioning boss (207) protrudes from the bottom wall of the positioning blind groove (205); in step S2, a loading platform (307) for carrying electronic components is formed in the positioning blind groove (205) of the frame housing (3). 03), the loading platform (303) is formed with a positioning column (304) protruding into the positioning through hole (206) and a positioning through hole (305) accommodating the positioning boss (207), the positioning boss (207) cooperates with the positioning through hole (305), the positioning column (304) cooperates with the positioning through hole (206), and the positioning boss (207) and the positioning column (304) are used to prevent the middle plate shell (2) and the frame shell (3) from separating from each other in a direction parallel to the main plate surface.

5. The method for manufacturing a smart phone integral injection-molded middle frame according to claim 2, characterized in that: In step S1, an antenna slot (208) is also formed on the middle plate shell (2), and the antenna slot (208) is recessed from a side wall of the accommodating blind slot (201) close to a side of the accommodating blind slot (201), and the antenna slot (208) is connected to the accommodating blind slot (201).

6. The method for manufacturing a smart phone integral injection-molded middle frame according to claim 4, characterized in that: The positioning column (304) comprises a column body connected to the bottom wall of the positioning blind groove (205) and a cover head arranged on the bottom wall of the column body away from the positioning blind groove (205); the outer diameter of the cover head is larger than the outer diameter of the column body; the cover head and the column body are both located in the positioning through hole (206); the cover head is used to clamp the positioning blind groove (205) with the bottom wall of the loading platform (303); and the positioning column (304) is used to prevent the middle plate shell (2) and the frame shell (3) from separating from each other in a direction perpendicular to the main plate surface.

7. The method for manufacturing a smart phone integral injection-molded middle frame according to claim 2, characterized in that: In step S1, the middle plate shell (2) is formed with a limiting perforation (209) and a limiting blind groove (210), wherein the limiting perforation (209) passes through the middle plate shell (2), while the limiting blind groove (210) does not pass through the middle plate shell (2); in step S2, the frame shell (3) is formed with a first limiting member (306) located at the limiting perforation (209) and a second limiting member (307) located at the limiting blind groove (210), wherein the first limiting member (306) and the second limiting member (307) extend outward from the frame shell (3) to form a fan-shaped structure that gradually widens, wherein the first limiting member (306) cooperates with the limiting perforation (209), and the second limiting member (307) cooperates with the limiting blind hole, and the first limiting member (306) and the second limiting member (307) are used to prevent the middle plate shell (2) and the frame shell (3) from separating from each other in a direction parallel to the main board surface.

8. The method for manufacturing a smart phone integral injection-molded middle frame according to claim 2, characterized in that: In step S1, the middle plate shell (2) is formed with an edge portion (211) surrounding the main plate surface, and the edge portion (211) is provided with a speaker, a charging port, a phone card slot, a power button port, a volume adjustment button port and a wired headphone port; in step S2, the frame shell (3) is formed with a receiving cavity (308) covering the edge portion (211).

9. The method for manufacturing a one-piece injection-molded middle frame of a smart phone according to claim 8, characterized in that: After step S2, the frame shell (3) is CNC-processed to obtain a second through hole (309) corresponding to and connected to the speaker port, the charging port, the phone card slot, the power button port, the volume adjustment button port and the wired headphone port, and the second through hole (309) is connected to the accommodating cavity (308).

10. The method for manufacturing a smart phone integral injection-molded middle frame according to claim 7, characterized in that: In step S1, the middle plate shell (2) is also formed with a screen-carrying surface that is away from the main plate surface, and both the main plate surface and the screen-carrying surface are provided with limiting blind grooves (210). The middle plate shell (2) is provided with at least two limiting blind grooves (210) respectively located on the main plate surface and the screen-carrying surface, and the frame shell (3) has at least two second limiting members (307) for clamping the middle plate shell (2). The two second limiting members (307) for clamping the middle plate shell (2) are used to prevent the middle plate shell (2) and the frame shell (3) from separating from each other in a direction perpendicular to the main plate surface.

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