Manufacturing process of mobile phone middle frame

Abstract

The invention discloses a mobile phone middle frame manufacturing process, and belongs to the technical field of portable intelligent equipment middle frame structure manufacturing processes, the mobile phone middle frame manufacturing process comprises the following steps: firstly preparing a middle plate die casting, then respectively preparing a plurality of frame pieces, and then connecting the middle plate die casting with at least two frame pieces by using a laser welding process; the middle plate-frame part is machined, so that the preset positions of the middle plate die casting and the frame part are machined to prepare injection molding groove positions; thirdly, in-mold injection molding is carried out on the machined middle plate-frame piece, finally, after in-mold injection molding is carried out on the workpiece, mechanical finish machining is carried out, and surface treatment is carried out to obtain a finished product. According to the manufacturing process of the mobile phone middle frame, the technical problems that in the prior art, products are low in end, the process is limited, the machining cost is high, and the quality is unstable are solved.

Description

Technical Field

[0001] The present invention relates to the technical field of manufacturing technology of a middle frame structure of a portable intelligent device, and in particular to a manufacturing technology of a middle frame of a mobile phone. Background Art

[0002] Portable smart devices refer to small electronic devices that can be carried and used, and have independent energy, computing power and various smart functions, such as smart phones, tablets, portable game consoles, mini projectors, portable air purifiers, smart bracelets / watches, etc. These devices have penetrated into people's daily lives and are constantly developing and innovating.

[0003] In the development trend of portable smart devices such as smartphones, as users' requirements for large format and lightweight increase, in order to enhance their structural strength, they tend to replace their internal supporting frame structures from plastic materials with metal materials; moreover, changing the middle frame structure of portable smart devices from plastic parts to metal parts also has the advantages of better improving the heat dissipation function of the device.

[0004] Generally speaking, when manufacturing a structural frame for a portable smart device having external parts and an internal metal bracket, it is necessary to use metal processing equipment to perform integrated machining on the external frame and the internal structure, or to manufacture the metal external frame and the internal metal bracket separately and finally assemble them; or to use a method of using the external frame and the internal metal bracket to be cast into one piece.

[0005] Based on this, Chinese patent CN108605061B discloses a mobile phone and its frame, wherein the mobile phone frame includes an outer frame, an intermediate plate and a first plastic, wherein the outer frame is obtained by bending a titanium alloy strip into a predetermined size; the intermediate plate is arranged inside the outer frame; and the first plastic fixes the outer edge of the intermediate plate to the inner side wall of the outer frame by injection molding. The mobile phone frame adopts a titanium alloy outer frame and an aluminum intermediate plate and is fixed by injection molding, so that the mobile phone frame has a simple structure, is easy to manufacture, has reliable strength and beautiful appearance, is fixed by injection molding, and then CNC processed, and then secondary injection molding is performed to ensure the consistency and accuracy of the processing.

[0006] However, the mobile phone and its frame disclosed above still have defects such as process limitations, high processing costs and unstable quality. Specifically, based on the prior art, if metal materials are used for molding and the external frame and internal structure are machined in one piece, there are technical problems such as too high appearance standards, high manufacturing costs, and low productivity. If a process is adopted in which the metal external frame and the internal metal bracket are manufactured separately and then assembled, problems such as difficult to control assembly tolerances, low bonding strength, and high assembly costs will arise. In addition, although the process of using the external frame and the internal bracket to be cast into one piece has the advantage of easy manufacturing, there will also be technical problems such as low quality of the finished product, low-end products, and poor control. Furthermore, the appearance requirements of existing mobile phones and portable smart devices are high, and some products need to be beautify by processes such as anodizing; the existing mobile phone middle frame technology cannot achieve this. Summary of the invention

[0007] Based on this, it is necessary to provide a manufacturing process for a mobile phone middle frame in order to solve the technical problems existing in the prior art, such as low-end products, process limitations, high processing costs and unstable quality.

[0008] A manufacturing process for a mobile phone middle frame comprises the following steps: S1: Preparation of middle plate die casting: First, the middle plate main structure is prepared by metal die casting process, and then the periphery of the middle plate main structure is machined to remove the die casting draft and control the dimensional accuracy of the middle plate main structure to make it suitable for subsequent welding process; S2: preparing a number of frame pieces respectively: using a roller to roll the aluminum material coil to control the cross section of the aluminum material to meet the preset size requirements, and then leveling and cutting to a preset length; Next, the cut strips are placed into a die, and a stamping process is used to form the shape of a preset frame member, so that the short side of each frame member is perpendicular to its long side; Then, the formed frame pieces are placed in the fixture of the machining center and processed to the required size using CNC. The shape and size of the inner welding groove of each frame piece are processed to the preset accuracy using CNC process. After the stamping and CNC processes, the periphery of a middle plate die casting is connected around at least two frame pieces; S3: Connect the middle plate die casting with at least two frame members by using a laser welding process: install the middle plate die casting and all the frame members into a welding fixture at the same time, and keep the positioning of both accurate; start the laser welding machine, align the laser beam with the required welding position, so that the middle plate die casting and the surrounding frame members are stably connected; S4: After laser welding is completed, the middle plate-frame member is machined so that the preset positions of the middle plate die casting and the frame member are machined to prepare injection molding slots; S5: In-mold injection molding of the finished middle plate-frame parts: first, the parts are thoroughly cleaned by the degreasing pre-treatment process; then, micropores are generated by T treatment to facilitate the completion of the nano injection molding process; and then the preset positions of the middle plate-frame parts are filled with plastic by nano injection molding. S6: Mechanical finishing after in-mold injection molding: Place the in-mold injection molded parts on the fixture, accurately position them, and use a multi-axis machining center to process them in one go; then, the outer surface of the middle frame is sandblasted and anodized to prepare the mobile phone middle plate product.

[0009] Furthermore, a middle frame structure that is easy to form using the aforementioned manufacturing process for a mobile phone middle frame is provided, which includes: 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 surface of each frame forming part is connected to the edge surface of the middle plate forming part; a plurality of 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.

[0010] Furthermore, the middle plate forming part has a main body structure and a side edge structure.

[0011] Furthermore, the side edge structure is arranged around the periphery of the main structure.

[0012] Furthermore, the frame forming portion has at least two surrounding frames, an appearance shaping portion, an inlay groove and a welding portion.

[0013] Furthermore, all the surrounding frames are connected end to end in sequence to form a ring.

[0014] Furthermore, the outer side of each surrounding frame is provided with the appearance modeling portion, and the inner side of each surrounding frame is provided with the inlay groove and the welding portion, and the inlay groove and the welding portion are arranged adjacent to each other.

[0015] Furthermore, the side edge structure is matched and connected with the inlay groove.

[0016] Furthermore, the surrounding frame is provided with a surrounding frame body, an injection molding groove and a socket portion.

[0017] Furthermore, a plurality of the injection molding grooves are evenly distributed in the surrounding frame body, and each of the socket portions is correspondingly arranged to penetrate through the surrounding frame body.

[0018] In summary, the manufacturing process of a mobile phone middle frame of the present invention is to prepare a middle plate die-casting first, and then prepare a plurality of frame parts respectively, and then use a laser welding process to connect the middle plate die-casting with at least two frame parts: after the laser welding is completed, the middle plate-frame part is machined so that the preset positions of the middle plate die-casting and the frame parts are processed to prepare injection slots; then, the middle plate-frame part that has been processed is molded in the mold: finally, the workpiece is molded in the mold and then mechanically finished, and surface treated to obtain the finished product. After adopting the process disclosed by the present invention, the cost can be reduced, and the whole machining is changed to partial machining, which reduces the processing amount by 70% and the comprehensive cost by 40%; moreover, it also has the advantage of stable quality, because the method of welding the frame and the middle plate successfully solves the problem that the die-cast aluminum cannot be anodized and colored, and the very small amount of processing allows each process to be completed accurately. In addition, the present invention also has the advantage of improved production efficiency, and its total processing time is shortened from the original 58 minutes to 37 minutes, which improves the efficiency by 36%. Therefore, the manufacturing process of the mobile phone middle frame of the present invention solves the technical problems existing in the prior art such as low-end products, process limitations, high processing costs and unstable quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A schematic diagram of a manufacturing process of a mobile phone middle frame of the present invention; Figure 2 This is a schematic structural diagram of a middle frame structure that is easy to form according to the present invention; Figure 3 It is a structural schematic diagram of a middle frame structure part structure which is easy to form according to the present invention; Figure 4 This is a schematic diagram of an exploded structure of a middle frame structure part that is easy to form according to the present invention; Figure 5 This is a schematic diagram of an exploded structure of a middle frame structure part that is easy to form according to the present invention; Figure 6 A schematic diagram of a process flow of a manufacturing process for a mobile phone middle frame of the present invention; Figure 7 The present invention is another process flow diagram of a manufacturing process for a mobile phone middle frame. DETAILED DESCRIPTION

[0020] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present invention, so the present invention is not limited by the specific embodiments disclosed below.

[0021] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0022] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0023] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0024] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0025] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

[0026] See also Figure 1 The present invention provides a manufacturing process for a mobile phone middle frame, which comprises the following steps: S1: Preparation of middle plate die casting: First, the middle plate main structure is prepared by metal die casting process, and then the periphery of the middle plate main structure is machined to remove the die casting draft and control the dimensional accuracy of the middle plate main structure to make it suitable for subsequent welding process; S2: preparing a number of frame pieces respectively: using a roller to roll the aluminum material coil to control the cross section of the aluminum material to meet the preset size requirements, and then leveling and cutting to a preset length; Next, the cut strips are placed into a die, and a stamping process is used to form the shape of a preset frame member, so that the short side of each frame member is perpendicular to its long side; Then, the formed frame pieces are placed in the fixture of the machining center and processed to the required size using CNC. The shape and size of the inner welding groove of each frame piece are processed to the preset accuracy using CNC process. After the stamping and CNC processes, the periphery of a middle plate die casting is connected around at least two frame pieces; S3: Connect the middle plate die casting with at least two frame members by using a laser welding process: install the middle plate die casting and all the frame members into a welding fixture at the same time, and keep the positioning of both accurate; start the laser welding machine, align the laser beam with the required welding position, so that the middle plate die casting and the surrounding frame members are stably connected; S4: After laser welding is completed, the middle plate-frame member is machined so that the preset positions of the middle plate die casting and the frame member are machined to prepare injection molding slots; S5: In-mold injection molding of the finished middle plate-frame parts: first, the parts are thoroughly cleaned by the degreasing pre-treatment process; then, micropores are generated by T treatment to facilitate the completion of the nano injection molding process; and then the preset positions of the middle plate-frame parts are filled with plastic by nano injection molding. S6: Mechanical finishing after in-mold injection molding: Place the in-mold injection molded parts on the fixture, accurately position them, and use a multi-axis machining center to process them in one go; then, the outer surface of the middle frame is sandblasted and anodized to prepare the mobile phone middle plate product.

[0027] Specifically, in a manufacturing process of a mobile phone middle frame of the present invention, it is possible to reduce machining allowances. For example, for the structure of the middle plate die-casting, the structure that originally required machining can now be die-casted in one step using a metal die-casting process, which can reduce the overall cost of the original full machining solution by more than 40%.

[0028] In addition, in the mobile phone middle plate product prepared by the manufacturing process of the mobile phone middle frame of the present invention, its appearance can be optimized by anodizing. For example, for the original overall die-casting processing scheme, due to the high silicon content of the die-cast aluminum component, the anodized appearance effect cannot be achieved; after adopting the process method of the present invention, the frame periphery can be processed and prepared using AL6063 profiles that are easy to achieve anodization; thus, the problem of the difficulty of achieving anodization of the appearance of the original scheme is solved.

[0029] Furthermore, the present invention has the advantage of stable quality, because the middle plate product is finely processed after laser welding; therefore, the overall size of the middle plate product is stable, and the phenomenon of poor appearance and size during the processing process is reduced; the pass rate of good products can be increased to more than 92%.

[0030] Furthermore, after adopting the technical solution of the present invention, the overall structure of the mobile phone mid-plate product can be changed to a split structure. When a component thereof becomes defective, there is no need to scrap the entire component, but only a single split component needs to be scrapped. Thus, the scrapping cost of the material can be reduced.

[0031] Furthermore, the product that uses laser welding to connect the middle plate and the frame member can have the advantages of good structural strength and no deformation.

[0032] For further information, please refer to Figures 2 to 5 , a middle frame structure that is easy to form using the manufacturing process of the above-mentioned mobile phone middle frame, comprising: a middle plate forming part 1, a frame forming part 2 and an auxiliary forming part 3; at least two frame forming parts 2 are arranged around the periphery of the middle plate forming part 1, and the inner side surface of each frame forming part 2 is connected to the edge surface of the middle plate forming part 1; a plurality of auxiliary forming parts 3 are distributed 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.

[0033] Furthermore, the middle plate forming portion 1 has a main structure 101 and a side edge structure 102 ; the side edge structure 102 is arranged around the periphery of the main structure 101 .

[0034] Furthermore, 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 the surrounding frames 201 are connected end to end in sequence to form a ring, 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 is adjacent to the welding part 204; the side standing edge structure 102 is matched and connected with the inlay groove 203.

[0035] Specifically, after all the surrounding frames 201 are sequentially surrounded to form a closed ring, each of the inlay grooves 203 provided on the inner side thereof can also be connected end to end and communicate with each other, so that the side edge structure 102 provided on the periphery of the main structure 101 can be inlaid therein. Thereafter, a laser welding process can be used to add solder to the welding portion 204 so that the side edge structure 102 is firmly inlaid and connected in the inlay groove 203. More specifically, the user can use anodizing and other processes to process the cancerous shape portion 202 so as to produce the desired aesthetic appearance effect.

[0036] Furthermore, a certain portion of the surrounding frame 201 is provided with a surrounding frame body 201a, an injection molding groove 201b and a socket portion 201c; a plurality of the injection molding grooves 201a are evenly distributed in the surrounding frame body 201a, and each socket portion 201c is correspondingly arranged through the surrounding frame body 201a.

[0037] Furthermore, the main molding material of the auxiliary molding part 3 is PC+GF20. The main functions of the auxiliary molding part 3 include: first, some parts of the middle frame of the mobile phone need to be insulated; therefore, it is necessary to remove the metal-filled plastic; second, it plays an auxiliary connection role to achieve a stable connection of the middle plate components.

[0038] Specifically, the injection groove 201b is used for connecting and attaching the injection molded parts during in-mold injection molding, and the socket portion 201c is used for matching components such as the plug connector of a mobile phone and a portable terminal.

[0039] Specifically, Figure 2 As shown, in a specific embodiment, the middle plate forming part 1 is made of aluminum alloy material through a die-casting process, and its forming material can be ADC12, and its forming conditions are: mold temperature 220°C, material temperature 570-590 degrees; clamping force 350T, and molding cycle 58 seconds.

[0040] After the main structure 101 is die-casted by a metal forming process, its side surface can be further machined to obtain the side edge structure 102. Machining the side surface can remove the draft angle generated during die-casting and obtain precise external dimensions so that it can be embedded in the embedding groove 203. In addition, it can be processed for the next step of laser welding.

[0041] For further information, please refer to Figure 6 to Figure 7 ; In a specific embodiment, when preparing a plurality of frame parts, a multi-station continuous rolling mill can be used; it mainly includes the following processes: rolling--annealing-leveling-cutting: the rolling raw material is a large round coil provided by the aluminum factory; after the operator loads the coil into the preset multi-station rolling machine feed plate, it is rolled by multiple rollers and softened by intermediate annealing to form a rectangle with a required cross-section, for example: its cross-sectional size is 12*4.0mm; thereafter, it is leveled and cut to the required length, and then transferred to the next process of stamping and forming.

[0042] Forming - machining: Place the cut strips into the die to form the required shape, with the short side perpendicular to the long side; then place the formed product into the fixture of the machining center and process it to the required size, especially the inner welding groove, the size of which must be precisely machined to facilitate the laser welding process with the middle plate in the next process.

[0043] Specifically, during rolling, the aluminum material used is AL6063, which is annealed and softened to HV50 after rolling, and then cut to a preset length. During bending, the forming conditions are: 80T press, forming time 6 seconds.

[0044] In summary, the manufacturing process of a mobile phone middle frame of the present invention is to prepare a middle plate die-casting first, and then prepare a plurality of frame parts respectively, and then use a laser welding process to connect the middle plate die-casting with at least two frame parts: after the laser welding is completed, the middle plate-frame part is machined so that the preset positions of the middle plate die-casting and the frame parts are processed to prepare injection slots; then, the middle plate-frame part that has been processed is molded in the mold: finally, the workpiece is molded in the mold and then mechanically finished, and surface treated to obtain the finished product. After adopting the process disclosed by the present invention, the cost can be reduced, and the whole machining is changed to partial machining, which reduces the processing amount by 70% and the comprehensive cost by 40%; moreover, it also has the advantage of stable quality, because the method of welding the frame and the middle plate successfully solves the problem that the die-cast aluminum cannot be anodized and colored, and the very small amount of processing allows each process to be completed accurately. In addition, the present invention also has the advantage of improved production efficiency, and its total processing time is shortened from the original 58 minutes to 37 minutes, which improves the efficiency by 36%. Therefore, the manufacturing process of the mobile phone middle frame of the present invention solves the technical problems existing in the prior art such as low-end products, process limitations, high processing costs and unstable quality.

[0045] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0046] The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A manufacturing process for a mobile phone middle frame, characterized in that: It includes the following steps: S1: Preparation of middle plate die casting: First, the middle plate main structure is prepared by metal die casting process, and then the periphery of the middle plate main structure is machined to remove the die casting draft and control the dimensional accuracy of the middle plate main structure to make it suitable for subsequent welding process; S2: preparing a number of frame pieces respectively: using a roller to roll the aluminum material coil to control the cross section of the aluminum material to meet the preset size requirements, and then leveling and cutting to a preset length; Next, the cut strips are placed into a die, and a stamping process is used to form the shape of a preset frame member, so that the short side of each frame member is perpendicular to its long side; Then, the formed frame pieces are placed in the fixture of the machining center and processed to the required size using CNC. The shape and size of the inner welding groove of each frame piece are processed to the preset accuracy using CNC process. After the stamping and CNC processes, the periphery of a middle plate die casting is connected around at least two frame pieces; S3: Connect the middle plate die casting with at least two frame members by using a laser welding process: install the middle plate die casting and all the frame members into a welding fixture at the same time, and keep the positioning of both accurate; start the laser welding machine, align the laser beam with the required welding position, so that the middle plate die casting and the surrounding frame members are stably connected; S4: After laser welding is completed, the middle plate-frame member is machined so that the preset positions of the middle plate die casting and the frame member are machined to prepare the injection molding slots; S5: In-mold injection molding is performed on the finished middle plate-frame parts: first, the parts are thoroughly cleaned by using the degreasing pre-treatment process; then, micropores are generated by T treatment to facilitate the completion of the nano injection molding process; Then use nano injection molding to fill the preset position of the center plate-frame with plastic S6: Mechanical finishing after in-mold injection molding: Place the in-mold injection molded parts on the fixture, accurately position them, and use a multi-axis machining center to complete the processing in one go; Then, the outer surface of the middle frame is sandblasted and then anodized to prepare a mobile phone middle plate product.

2. A middle frame structure that is easy to form using the manufacturing process of a mobile phone middle frame as claimed in claim 1, characterized in that: It includes: 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 surface of each frame forming part is connected to the edge surface of the middle plate forming part; a plurality of 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.

3. The middle frame structure that is easy to form according to claim 2 is characterized in that: The middle plate forming part has a main body structure and a side standing edge structure.

4. The middle frame structure that is easy to form according to claim 3 is characterized in that: The side edge structure is arranged around the periphery of the main structure.

5. The middle frame structure that is easy to form according to claim 4 is characterized in that: The frame forming part has at least two surrounding frames, an appearance shaping part, an inlay groove and a welding part.

6. The middle frame structure that is easy to form according to claim 5, characterized in that: All the surrounding frames are connected end to end in sequence to form a ring.

7. The middle frame structure that is easy to form according to claim 6, 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 is adjacent to the welding part.

8. The middle frame structure that is easy to form according to claim 7, characterized in that: The side edge structure is matched and connected with the inlay groove.

9. The middle frame structure that is easy to form according to claim 8, characterized in that: The surrounding frame is provided with a surrounding frame body, an injection molding groove and a socket part.

10. The middle frame structure that is easy to form according to claim 9, characterized in that: A plurality of injection molding grooves are evenly distributed in the surrounding frame body, and each of the insertion portions is correspondingly arranged to penetrate through the surrounding frame body.

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