Middle frame structure convenient to form

Abstract

The utility model discloses a middle frame structure convenient to form, which belongs to the technical field of manufacturing process of middle frame structures of portable intelligent equipment and comprises a middle plate forming part, a frame forming part and an auxiliary forming part. At least two frame forming parts are arranged around the periphery of the middle plate forming part, and the inner side face of each frame forming part is connected with the edge face of the middle plate forming part; the auxiliary forming parts are distributed in the middle plate forming part, on the inner side of the frame forming part and between the middle plate forming part and the frame forming part. According to the manufacturing process of the mobile phone middle frame, the technical problems of low-end products, limited process, high processing cost, unstable quality and the like in the prior art are solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to portable intelligent equipment middle frame structure manufacturing process technical field, especially, it relates to a middle frame structure convenient to forming. BACKGROUND

[0002] Portable intelligent equipment refers to the small -size electronic equipment that can carry and use personally, and has independent energy, computing capacity and various intelligent functions, for example, smart mobile phone, tablet computer, portable game machine, mini -projector, portable air purifier, intelligent bracelet / watch etc. These devices have penetrated people's daily life, and are in continuous development and innovation.

[0003] In the development trend of similar smart mobile phone and other portable intelligent equipment, with the improvement of user's requirement to its large -format, light weight, in order to enhance its structural strength, more and more tend to replace the support frame structure in its interior by plastic material with metal material;And the middle frame structure of portable intelligent equipment is changed from plastic part to metal part, which also has the advantages of better improving the heat dissipation function of equipment.

[0004] Generally speaking, when manufacturing the structural frame of portable intelligent equipment with external parts and internal metal support, metal processing equipment is needed to carry out integrated mechanical processing on external frame and internal structure, or to manufacture metal external frame and internal metal support respectively, and finally to assemble them;Or use the method of integrally casting the external frame and internal metal support.

[0005] Based on this, Chinese patent CN108605061B discloses a kind of mobile phone and its frame, which includes outer frame, intermediate plate and first plastic, wherein outer frame is obtained by bending titanium alloy strip material with predetermined size;Intermediate plate is arranged in outer frame;First plastic fixes the outer edge of the intermediate plate and the inner side wall of the outer frame in injection molding mode.The mobile phone frame is simple in structure, easy to manufacture, reliable in strength, and beautiful in appearance due to the use of titanium alloy outer frame and aluminum intermediate plate and the fixation by injection molding mode, and after being fixed by injection molding mode, CNC processing is carried out again, and secondary injection molding is carried out, which ensures the consistency and accuracy of processing.

[0006] However, the aforementioned mobile phones and their frames still suffer from limitations in manufacturing processes, high processing costs, and unstable quality. Specifically, considering existing technologies, if metal materials are used for molding and processing, and the external frame and internal structure are machined as a single unit, there are technical problems such as excessively high appearance standards, high manufacturing costs, and low productivity. If a process of manufacturing the metal external frame and internal metal support separately and then assembling them occurs, problems such as difficulty in controlling assembly tolerances, low joint strength, and high assembly costs arise. Furthermore, while the process of casting the external frame and internal support as a single unit has the advantage of ease of manufacturing, it also presents technical problems such as low finished product quality, low-end products, and poor controllability. Moreover, existing mobile phones and portable smart devices have high appearance requirements, and some products require aesthetic treatments such as anodizing; existing mobile phone mid-frame technology cannot achieve this. Utility Model Content

[0007] Therefore, it is necessary to provide a manufacturing process for mobile phone mid-frames to address the technical problems of existing technologies, such as low-end products, limited processes, high processing costs, and unstable quality.

[0008] A manufacturing process for a mobile phone mid-frame includes the following steps:

[0009] S1: Preparation of the middle plate die casting: First, the main structure of the middle plate is prepared by metal die casting process. Then, the periphery of the main structure of the middle plate is machined to remove the die casting draft angle and control the dimensional accuracy of the main structure of the middle plate so that it is suitable for subsequent welding processes.

[0010] S2: Prepare several frame parts respectively: Use rollers to roll the aluminum material roll to control the cross-section of the aluminum material to meet the preset size requirements, and then level and cut it to the preset length;

[0011] Next, the cut strips are placed into the die and stamped to form the shape of the pre-set frame pieces, so that the short side of each frame piece is perpendicular to its long side.

[0012] Then, the formed frame parts are placed into the fixture of the machining center and machined to the required size using CNC; the shape and size of the inner welding groove of each frame part are machined to the preset accuracy using CNC processes;

[0013] After the stamping and CNC processes, the perimeter of a medium-sized die-cast part shall be connected by at least two frame members.

[0014] S3: connecting the middle plate die casting with at least two frame pieces by using a laser welding process: loading the middle plate die casting and all the frame pieces into a welding fixture at the same time, keeping the positioning of both accurate; starting the laser welding machine, aiming the laser beam at the part to be welded, and stably connecting the middle plate die casting with the frame pieces around it;

[0015] S4: after the laser welding is completed, machining the middle plate-frame piece to make the preset positions of the middle plate die casting and the frame piece be processed into plastic injection groove positions;

[0016] S5: in-mold injection of the machined middle plate-frame piece: first, thoroughly clean the parts using a pre-treatment process of degreasing and degreasing; then, generate micropores using T processing to facilitate the completion of the nano-injection process; then, fill the plastic at the preset positions of the middle plate-frame piece using nano-injection

[0017] S6: mechanical finishing after in-mold injection molding: place the in-mold injection part on the fixture, accurately position it, and use a multi-axis machining center to process it in place at one time; then, anodize and color the outer surface of the middle frame after sandblasting to prepare the middle plate product of the mobile phone.

[0018] Further, a middle frame structure convenient for forming using the manufacturing process of the aforementioned middle frame of a mobile phone comprises: a middle plate forming part, a frame forming part, and an auxiliary forming part; the periphery of the middle plate forming part is provided with at least two frame forming parts, and the inner side of each frame forming part is connected with the edge surface of the middle plate forming part; a plurality of auxiliary forming parts are arranged in the middle plate forming part, the inner side of the frame forming part, and between the middle plate forming part and the frame forming part.

[0019] Further, the middle plate forming part has a main body structure and a side standing edge structure.

[0020] Further, the periphery of the main body structure is surrounded by the side standing edge structure.

[0021] Further, the frame forming part has at least two surrounding frames, an appearance modeling part, an inlay groove, and a welding part.

[0022] Further, all the surrounding frames are connected end to end in sequence to form a ring.

[0023] Further, the outer side of each surrounding frame is provided with the appearance modeling part, and the inner side of each surrounding frame is provided with the inlay groove and the welding part, and the inlay groove and the welding part are arranged adjacent to each other.

[0024] Further, the side standing edge structure is matched and connected with the inlay groove.

[0025] Further, the surrounding frame is provided with a surrounding frame body, an injection slot and a socket part.

[0026] Further, the surrounding frame body is uniformly provided with a plurality of injection slots, and each socket part is arranged through the surrounding frame body.

[0027] To sum up, the manufacturing process of the mobile phone middle frame of the utility model is characterized in that: a middle plate die casting is prepared first, a plurality of frame pieces are prepared respectively, then the middle plate die casting and at least two frame pieces are connected by using a laser welding process, after the laser welding is completed, the middle plate-frame piece is machined so that the preset positions of the middle plate die casting and the frame piece are machined and injection slot positions are prepared, then the machined middle plate-frame piece is in-mold injection molded, finally, the workpiece is in-mold injection molded, mechanical finishing is carried out, and surface treatment is carried out to obtain a finished product. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 It is a flowchart of the manufacturing process of the mobile phone middle frame of the utility model;

[0029] Figure 2 It is a structural diagram of the middle frame structure convenient for molding of the utility model;

[0030] Figure 3 It is a structural diagram of part of the middle frame structure convenient for molding of the utility model;

[0031] Figure 4 It is an exploded structural diagram of part of the middle frame structure convenient for molding of the utility model;

[0032] Figure 5 It is an exploded structural diagram of part of the middle frame structure convenient for molding of the utility model;

[0033] Figure 6 It is a machining flowchart of the manufacturing process of the mobile phone middle frame of the utility model;

[0034] Figure 7Another processing flow schematic view of the manufacturing process of the mobile phone middle frame. DETAILED DESCRIPTION

[0035] In order to make the above objectives, characteristics and advantages of the present application more apparent, concrete embodiments of the present application will be described in detail below with reference to the drawings. In the following description, a large number of specific details are set forth in order to provide a comprehensive understanding of the present application. However, the present application can be implemented in many different ways other than those described herein, and those skilled in the art can make similar improvements without departing from the spirit of the present application, so the present application is not limited to the specific embodiments disclosed below.

[0036] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0037] In addition, the terms "first", "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, for example, two, three, etc., unless otherwise explicitly specified.

[0038] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0039] In the present application, unless otherwise explicitly specified and limited, the first feature is "on" or "under" the second feature, which can be direct contact between the first and second features, or indirect contact through an intermediate medium. Moreover, the first feature "above", "above" and "above" the second feature can be directly above or obliquely above the first feature, or only indicate that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature can be directly below or obliquely below the first feature, or only indicate that the horizontal height of the first feature is less than that of the second feature.

[0040] It should be noted that when an element is referred to as "fixed to" or "provided on" another element, it can be directly on another element or there can be a middle element. When an element is considered to be "connected" to another element, it can be directly connected to another element or there can be a middle element. The terms "vertical", "horizontal", "up", "down", "left", "right" and similar expressions used herein are only for illustrative purposes and are not the only embodiment.

[0041] Please refer to Figure 1 The manufacturing process of the mobile phone middle frame comprises the following steps:

[0042] S1: preparing a middle plate die casting: first, a middle plate main body structure is prepared by using a metal die casting process, and then the periphery of the middle plate main body structure is machined to remove the die casting draft angle and control the size accuracy of the middle plate main body structure so that it is suitable for subsequent welding process;

[0043] S2: preparing a plurality of frame pieces: rolling the aluminum material roll using a rolling mill to control the cross section of the aluminum material to meet the preset size requirement, and then leveling and cutting to the preset length;

[0044] Then, the cut strip-shaped piece is placed in the die, and the shape of the preset frame piece is formed by using the stamping process, so that the short side of each frame piece is perpendicular to the long side thereof;

[0045] Then, the formed frame piece is placed in the clamp of the machining center, and the CNC is used to process it to the required size; the shape and size of the inner side welding groove of each frame piece are processed to the preset accuracy by using the CNC process;

[0046] After the stamping and CNC process, at least two frame pieces are used to surround and connect the periphery of a middle plate die casting;

[0047] S3: connecting the middle plate die casting and the at least two frame pieces by using a laser welding process: simultaneously loading the middle plate die casting and all the frame pieces into a welding fixture, keeping the positions of the two accurate; starting a laser welding machine, aiming the laser beam at the position needed to be welded, and stably connecting the middle plate die casting and the frame pieces around it;

[0048] S4: after the laser welding is completed, machining the middle plate-frame piece, so that the preset positions of the middle plate die casting and the frame piece are machined into plastic injection groove positions;

[0049] S5: in-mold injection of the machined middle plate-frame piece: first, thoroughly cleaning the part by using a degreasing pretreatment process; then, generating micropores by using a T process to facilitate the completion of the nano-injection process; and then, filling plastic into the preset positions of the middle plate-frame piece by using nano-injection

[0050] S6: mechanical finishing after in-mold injection molding: placing the in-mold injection part on a fixture, accurately positioning, using a multi-axis machining center to process in place at one time; and then, spraying the outer surface of the middle frame and then anodizing and coloring to prepare a mobile phone middle plate product.

[0051] Specifically, in the manufacturing process of the mobile phone middle frame, the machining allowance can be reduced. For example, for the structure of the middle plate die casting, the original structure that needs to be machined can now be formed by one-time die casting by using a metal die casting process, which can reduce the overall cost of the original machining solution by more than 40%.

[0052] In addition, the appearance of the mobile phone middle plate product prepared by using the manufacturing process of the mobile phone middle frame can be optimized by anodizing process. For example, for the original overall die casting processing solution, because the silicon content of the die casting aluminum composition is relatively high, anodizing appearance effect cannot be achieved. However, by using the process method of the mobile phone middle frame, the frame body can be processed and prepared by using AL6063 profile which is easy to realize anodizing. Therefore, the problem of difficult realization of anodizing appearance of the original solution is solved.

[0053] Further, the mobile phone middle frame has the advantages of stable quality, because the middle plate product is precisely machined after laser welding. Therefore, the overall size of the middle plate product is stable, and the appearance and size defects in the machining process are reduced. The good product pass rate can be increased to more than 92%.

[0054] Further, by using the technical solution of the mobile phone middle frame, the overall structure of the mobile phone middle plate product can be changed to a split structure. When a part of the split structure is defective, the whole product does not need to be scrapped, and only the single split part needs to be scrapped. Therefore, the cost of scrapping materials can be reduced.

[0055] Further, the product of connecting the middle plate and the frame member by laser welding can have the advantages of good structural strength and no deformation.

[0056] Further, please continue to refer to Figures 2 to 5 A middle frame structure convenient for molding using the manufacturing process of the foregoing mobile phone middle frame, comprising: a middle plate forming part 1, a frame forming part 2, and an auxiliary forming part 3; the periphery of the middle plate forming part 1 is provided with at least two frame forming parts 2, and the inner side surface of each frame forming part 2 is connected with the edge surface of the middle plate forming part 1; a plurality of auxiliary forming parts 3 are distributed and arranged in the middle plate forming part 1, the inner side of the frame forming part 2, and between the middle plate forming part 1 and the frame forming part 2.

[0057] Further, the middle plate forming part 1 has a main body structure 101 and a side standing edge structure 102; the periphery of the main body structure 101 is provided with the side standing edge structure 102.

[0058] Further, the frame forming part 2 has at least two surrounding frames 201, an appearance modeling part 202, an inlay groove 203, and a welding part 204; all of the surrounding frames 201 are sequentially connected end to end to form a closed annular shape, the outer side of each surrounding frame 201 is provided with the appearance modeling part 202, the inner side of each surrounding frame 201 is provided with the inlay groove 203 and the welding part 204, and the inlay groove 203 and the welding part 204 are arranged adjacent to each other; and the side standing edge structure 102 is matched and connected with the inlay groove 203.

[0059] Specifically, after all of the surrounding frames 201 are sequentially connected end to end to form a closed annular shape, each inlay groove 203 arranged on the inner side thereof can also be connected end to end to communicate with each other, so that the side standing edge structure 102 arranged on the periphery of the main body structure 101 can be inlaid therein. Thereafter, a laser welding process can be used to add solder in the welding part 204, so that the side standing edge structure 102 is stably inlaid and connected in the inlay groove 203. More specifically, the user can use an anodizing process to process the appearance modeling part 202, so that the desired beautifying appearance effect can be produced.

[0060] Further, some of the surrounding frames 201 are provided with a surrounding frame main body 201a, an injection molding groove 201b, and a socket part 201c; a plurality of injection molding grooves 201a are uniformly distributed and arranged in the surrounding frame main body 201a, and each socket part 201c is correspondingly and penetratingly arranged in the surrounding frame main body 201a.

[0061] Further, the main forming material of the auxiliary forming part 3 is PC+GF20, and the main role of the auxiliary forming part 3 includes: first, some places of the mobile phone middle frame need to be insulated, so the metal filling plastic needs to be removed; second, the auxiliary connecting role is used to realize the stable connection of the middle plate part.

[0062] Specifically, the injection molding groove 201b is used for the connection and adhesion of the injection molding part during the in-mold injection molding, and the socket part 201c is used for matching the plug and other parts of the mobile phone portable terminal.

[0063] Specifically, as shown in Figure 2 In a specific embodiment, the middle plate forming part 1 is made of aluminum alloy material by pressure casting process, the forming material can be ADC12, the forming condition is that the mold temperature is 220°C, the material temperature is 570-590 degrees, the mold clamping force is 350T, and the forming cycle is 58 seconds.

[0064] After the main body structure 101 is pressure cast by the metal forming process, the side surface can continue to use the machining process to obtain the side standing edge structure 102, and the side surface is machined for two purposes: one is to remove the draft angle generated during pressure casting, and the other is to process the precise outer dimension so that it can be inlaid in the inlay groove 203. And, it can be processed for the next step of laser welding.

[0065] Further, please continue to refer to Figures 6 to 7 In a specific embodiment, when preparing several frame parts, a multi-station continuous rolling machine can be used, which mainly includes the following processes: rolling--annealing--flattening--cutting: the rolling raw material is a circular disc material provided by an aluminum material factory; the operator loads the coil material into the preset multi-station rolling machine feed tray, passes through multiple rolling rollers, and is softened by intermediate annealing, so as to form a rectangle with a required cross-sectional size, for example, the cross-sectional size is 12*4.0mm; thereafter, it is flattened and cut to the required length, and then punched and formed.

[0066] Forming--machining: the cut strip part is placed in the punch die to form the required shape, and the short side is perpendicular to the long side; then the formed product is placed in the clamp of the machining center, and is machined to the required size, especially the inner welding groove, which is precisely machined to facilitate the laser welding process with the middle plate in the next process.

[0067] Specifically, during rolling, the aluminum material used is AL6063, which is annealed and softened to HV50 degrees after rolling, and then cut to the preset length. During bending, the forming condition is that the 80T pressure machine is used, and the forming time is 6 seconds.

[0068] In summary, the manufacturing process of the mobile phone middle frame of the utility model discloses a middle plate die casting piece is prepared first, then a plurality of frame pieces are prepared respectively, then the middle plate die casting piece and at least two frame pieces are connected by using a laser welding process; after laser welding is completed, the middle plate-frame piece is machined to make the preset position of the middle plate die casting piece and the frame piece be processed into an injection molding groove; then, the middle plate-frame piece that completes machining is in-mold injection molded; finally, the workpiece is in-mold injection molded and formed, and surface treatment is carried out to obtain a finished product. After the process disclosed by the utility model is adopted, the cost can be reduced, the local machining is replaced by the whole machining, the machining amount is reduced by 70%, and the comprehensive cost is reduced by 40%; moreover, the utility model also has the advantages of stable quality, because the frame and the middle plate are welded, the problem that die-cast aluminum cannot be anodized is solved, the machining amount is extremely small, and each process can be accurately completed. In addition, the utility model also has the advantages of improved production efficiency, the total machining time is shortened from 58 minutes to 37 minutes, and the efficiency is improved by 36%. Therefore, the manufacturing process of the mobile phone middle frame solves the technical problems of low-end products, process limitations, high machining cost and unstable quality in the prior art.

[0069] The technical features of the above-described embodiments can be combined in any manner. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described, but as long as the combinations of the technical features do not contradict each other, they should be considered within the scope of the present disclosure.

[0070] The above-described embodiments only express several implementation manners of the utility model, and the description is relatively specific and detailed, but it should not be understood as a limitation on the scope of the utility model patent. It should be noted that for ordinary skilled persons in the art, without departing from the concept of the utility model, a number of modifications and improvements can be made, which are within the protection scope of the utility model. Therefore, the protection scope of the utility model patent should be subject to the appended claims.

Claims

1. A middle frame structure which is convenient for molding, characterized by, It includes: The middle plate forming part, the frame forming part and the auxiliary forming part; The periphery of the middle plate forming part is provided with at least two frame forming parts, and the inner side of each frame forming part is connected with the edge surface of the middle plate forming part; A plurality of auxiliary forming parts are arranged in the middle plate forming part, the inner side of the frame forming part and between the middle plate forming part and the frame forming part.

2. The middle frame structure convenient to form according to claim 1, characterized in that: The middle plate forming part has a main body structure and a side standing edge structure. 3.The middle frame structure convenient for molding according to claim 2, characterized in that: The periphery of the main body structure is provided with the side standing edge structure.

4. The middle frame structure convenient for molding according to claim 3, characterized in that: The frame forming part has at least two surrounding frames, an appearance modeling part, an inlay groove and a welding part.

5. The middle frame structure convenient for molding according to claim 4, characterized in that: All the surrounding frames are sequentially connected in a ring shape.

6. The middle frame structure convenient for molding according to claim 5, characterized in that: The outer side of each surrounding frame is provided with the appearance modeling part, and the inner side of each surrounding frame is provided with the inlay groove and the welding part, and the inlay groove and the welding part are arranged adjacent to each other.

7. The middle frame structure convenient for molding according to claim 6, characterized in that: The side standing edge structure is matched and connected with the inlay groove. 8.The middle frame structure convenient for molding according to claim 7, characterized in that: One surrounding frame is provided with a surrounding frame main body, an injection molding groove and a socket part. 9.The middle frame structure convenient for molding of claim 8, characterized in that: A plurality of injection molding grooves are uniformly arranged in the surrounding frame main body. 10.The middle frame structure convenient for molding of claim 9, characterized in that: Each socket part is correspondingly arranged through the surrounding frame main body.

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