Aluminum sheet and plastic composite mobile phone front shell and its forming method, injection mold

Abstract

This application provides an aluminum sheet and plastic composite mobile phone front shell, its forming method, and an injection mold. The forming method of the above-mentioned aluminum sheet and plastic composite mobile phone front shell includes the following steps: The milling processing information includes the milling hole area and the number of milling holes, and the injection molding information includes the plastic injection volume and the plastic distribution area; Use a high-precision numerical control machine tool to perform milling hole processing on the aluminum rolled material; Set the arch bending point according to the milling processing information, and the arch bending point is the centroid of the area formed by connecting the centroids of each milling hole area in sequence; Set the arch bending surface of the aluminum rolled material according to the plastic distribution area; Use a numerical control hydraulic forming machine to perform arch bending processing on the aluminum rolled material, with the arch bending point as the center, and the periphery of the aluminum rolled material bends upward relative to the arch bending surface; Inject plastic into the aluminum rolled material according to the plastic injection volume, and the plastic includes polycarbonate and glass fiber. The above-mentioned aluminum sheet and plastic composite mobile phone front shell and its forming method can effectively reduce the deformation of the mobile phone front shell, and thus reduce the functions or performance of the smart phone.

Description

Technical Field

[0001] The present invention relates to the technical field of electronic device manufacturing, and particularly to an aluminum sheet and plastic composite mobile phone front shell, a forming method thereof, and an injection mold. Background Art

[0002] With the improvement of people's living standards, materials and cultivation in all aspects, the requirements for the appearance texture and feel of mobile phones are getting higher and higher. Nowadays, smart phones are developing towards being thinner and lighter, and at the same time, it is required that smart phones can meet the strength requirements of bending resistance and drop resistance. Most smart phone front shells are injection-molded with aluminum sheets inside the mold as the skeleton of the overall strength of the smart phone, which can not only ensure the structural strength of the smart phone but also meet the thin and light requirements of the smart phone. However, the thickness of the aluminum sheet of the smart phone front shell is relatively small, and windows are opened on the aluminum sheet to optimize signal transmission and the installation of electronic devices. Combined with the uneven stress during the injection molding of plastic on the aluminum sheet, especially for the inconsistent distribution of plastic on the mobile phone front shell, the mobile phone front shell is prone to deformation, such as bending, twisting, or local warping, and it is difficult to repair even using the shaping process, thus affecting the structural stability, screen display effect, waterproof and dustproof performance, appearance aesthetics and other functions or performances of the smart phone. Summary of the Invention

[0003] An object of the present invention is to overcome the deficiencies in the prior art and provide an aluminum sheet and plastic composite mobile phone front shell, a forming method thereof, and an injection mold that can effectively reduce the deformation of the mobile phone front shell, thereby reducing the impact on the functions or performances of the smart phone.

[0004] The object of the present invention is achieved by the following technical solutions:

[0005] A forming method of an aluminum sheet and plastic composite mobile phone front shell includes the following steps:

[0006] Obtain the injection molding information and milling processing information of the aluminum rolled material, wherein the milling processing information includes the milling hole area and the number of milling holes, and the injection molding information includes the plastic injection volume and the plastic distribution area;

[0007] Perform milling hole processing on the aluminum rolled material using a high-precision numerical control machine tool to form functional milling holes in the aluminum rolled material;

[0008] Set the arch bending points according to the milling processing information, and the arch bending points are the centroids of the areas formed by connecting the centroids of each milling hole area in sequence;

[0009] Set the arch bending surface of the aluminum rolled material according to the plastic distribution area, wherein the arch bending surface is set on the side surface of the aluminum rolled material facing away from the plastic distribution area;

[0010] Use a numerically controlled hydraulic forming machine to perform arch bending treatment on the aluminum rolled material. With the arch bending point as the center, the periphery of the aluminum rolled material bends upward relative to the arch bending surface;

[0011] Inject plastic into the aluminum rolled material according to the plastic injection amount, so that the plastic is formed at the plastic distribution area of the aluminum rolled material. Among them, the plastic includes polycarbonate and glass fiber.

[0012] In one embodiment, the content of the glass fiber is 10% - 30%.

[0013] In one embodiment, the thickness of the aluminum rolled material is 0.25 mm - 0.8 mm.

[0014] In one embodiment, the arch bending height at the arch bending point is 0.5 mm - 2.0 mm.

[0015] In one embodiment, the arch bending point is located on the line connecting the centroid of the area formed by connecting the centroids of each perforation area in sequence and the centroid of the perforation area with the largest area, and the distance between the arch bending point and the centroid of the area formed by connecting the centroids of each perforation area in sequence is 0.01 cm - 0.15 cm.

[0016] In one embodiment, after the step of obtaining the injection molding information of the aluminum rolled material and before the step of performing perforation processing on the aluminum rolled material using a high-precision numerical control machine tool, the forming method of the aluminum sheet and plastic composite mobile phone front shell further includes the following steps:

[0017] Perform flanging treatment on the aluminum rolled material, so that four strengthening vertical edges are formed at the periphery of the aluminum rolled material, and each of the strengthening vertical edges protrudes from the arch bending surface.

[0018] In one embodiment, each strengthening vertical edge includes at least one corresponding segment and at least one offset segment connected to each other. In the length and width directions of the aluminum rolled material, the corresponding segments of each strengthening vertical edge are arranged corresponding to the perforation areas;

[0019] After the step of performing flanging treatment on the aluminum rolled material and before the step of performing perforation processing on the aluminum rolled material using a high-precision numerical control machine tool, the forming method of the aluminum sheet and plastic composite mobile phone front shell further includes the following steps:

[0020] Set the milling holes on the aluminum rolled material according to the milling processing information. The milling holes are linearly arranged along the length direction of each reinforcing vertical edge. The distance between every two adjacent milling holes at the staggered section of each reinforcing vertical edge is 0.8 cm to 1.0 cm. The distance between every two adjacent milling holes at the corresponding section of each reinforcing vertical edge is inversely proportional to the area of the corresponding milling hole area. The distance between every two adjacent milling holes at the corresponding section of each reinforcing vertical edge increases by 0.03 cm to 0.08 cm for every 0.05 cm 2 increase in the area of the corresponding milling hole area;

[0021] Perform primary milling on the aluminum rolled material using a high-precision numerical control machine tool to form a first glue-flowing milling hole at the milling hole position.

[0022] In one embodiment, after the step of performing primary milling on the aluminum rolled material using a high-precision numerical control machine tool and before the step of performing milling hole processing on the aluminum rolled material using a high-precision numerical control machine tool, the forming method of the aluminum sheet and plastic composite mobile phone front shell further includes the following steps:

[0023] Perform secondary milling on the aluminum rolled material using a high-precision numerical control machine tool to form a plurality of second glue-flowing milling holes in the area where the aluminum rolled material is adjacent to each reinforcing vertical edge. The plurality of second glue-flowing milling holes are linearly and evenly arranged along the length direction of each reinforcing vertical edge, and each second glue-flowing milling hole is arranged in a staggered manner with each first glue-flowing milling hole.

[0024] In one embodiment, after the step of flanging the aluminum rolled material and before the step of setting the milling holes on the aluminum rolled material according to the milling processing information, the forming method of the aluminum sheet and plastic composite mobile phone front shell further includes the following steps:

[0025] Perform hemming on each reinforcing vertical edge so that each reinforcing vertical edge is bent along a folding line to form a reinforcing hem. The extending direction of each folding line is the same as the length direction of the corresponding reinforcing vertical edge. The reinforcing hem of each reinforcing vertical edge faces away from the aluminum rolled material, and the milling hole position is arranged at the folding line.

[0026] In one embodiment, the height of the reinforcing vertical edge is 0.5 mm to 1.5 mm.

[0027] An aluminum sheet and plastic composite mobile phone front shell is prepared by the forming method of the aluminum sheet and plastic composite mobile phone front shell described in any of the above embodiments;

[0028] The aluminum sheet and plastic composite mobile phone front shell includes:

[0029] An aluminum rolling main body, on which a plurality of functional milling holes are provided, and the centroids of the plurality of functional milling holes are sequentially connected to enclose an arched bending area;

[0030] A plastic molding body, which is integrally injection-molded on the aluminum rolling main body. On the side of the aluminum rolling main body away from the plastic molding body, there is an arched bending surface. The aluminum rolling main body takes the centroid of the arched bending area as the bending point, so that the periphery of the aluminum rolling main body bends upward relative to the arched bending surface.

[0031] In one embodiment, the aluminum sheet and plastic composite mobile phone front shell further includes four strengthening vertical edges and four strengthening folding edges;

[0032] The four strengthening vertical edges are arranged along the periphery of the aluminum rolling main body, and each strengthening vertical edge stands on the arched bending surface of the aluminum rolling main body. The four strengthening folding edges are arranged corresponding to the four strengthening vertical edges. Each strengthening folding edge is connected to the corresponding strengthening vertical edge on the side away from the arched bending surface, and each strengthening folding edge is located on the side of the strengthening vertical edge away from the aluminum rolling main body. A plurality of first glue-flowing milling holes are provided at the connection of each strengthening vertical edge and the aluminum rolling material, and a plurality of second glue-flowing milling holes are provided at the connection of each strengthening vertical edge and the corresponding strengthening folding edge. The plurality of first glue-flowing milling holes and the plurality of second glue-flowing milling holes are both arranged along the length direction of the strengthening vertical edge, and each first glue-flowing milling hole is arranged in a staggered manner with each second glue-flowing milling hole.

[0033] An injection mold is used to inject plastic towards the aluminum rolling material according to the plastic injection amount, so that plastic is formed at the plastic distribution area of the aluminum rolling material to obtain the aluminum sheet and plastic composite mobile phone front shell according to any one of the above embodiments;

[0034] The injection mold includes a moving mold and a fixed mold. The moving mold can move in a direction close to or away from the fixed mold. On the side of the fixed mold close to the moving mold, there is an arched supporting surface;

[0035] When the fixed mold and the moving mold are closed, an injection molding cavity is formed. The arched supporting surface is located in the injection molding cavity. The injection molding cavity is used to accommodate the aluminum rolling main body. The arched supporting surface is used to abut against the side of the aluminum rolling profile away from the arched bending surface, and the injection molding cavity is used to inject plastic and integrally form a plastic molding body on the aluminum rolling main body.

[0036] Compared with the prior art, the present invention has at least the following advantages: the molding method of the aluminum sheet and plastic composite mobile phone front shell of the present invention adopts aluminum rolled material composite plastic molding to obtain the mobile phone front shell, which preliminarily reduces the deformation of the mobile phone front shell obtained by aluminum rolled material composite plastic molding; and adopts high-precision CNC machine tools to perform gong hole processing on the aluminum rolled material, which better ensures the accuracy of the functional gong holes, thereby achieving the optimization of transmission signals and effective installation of electronic devices, reducing the area and number of functional gong holes, thereby better reducing the influence of the structural strength of the aluminum rolled material, and further reducing the deformation of the mobile phone front shell obtained by aluminum rolled material composite plastic molding. In addition, the arch bending point and the arch bending surface are set respectively by obtaining the injection molding information and gong processing information of the aluminum rolled material. The arch bending point is the centroid of the area surrounded by the centroids of each gong hole area connected in sequence, and the arch bending surface is set on the side surface of the aluminum rolled material away from the plastic distribution area, and the CNC is used in combination. The hydraulic forming machine performs arch bending treatment on the aluminum rolled material, that is, the aluminum rolled material in the front shell of the mobile phone is pre-deformed, and the arch bending surface and the arch bending point are set as pre-deformation parameters. A CNC hydraulic forming machine is used, which can apply force with the arch bending point as the center position with high precision, and obtain aluminum rolled material with high precision arch bending degree, so as to better realize the stress uniformity of the aluminum rolled material in the front shell of the mobile phone during composite plastic molding, and further better ensure that the deformation of the front shell of the mobile phone obtained by the composite plastic molding of the aluminum rolled material is reduced, or the deformation of the front shell of the mobile phone can be better repaired under plastic molding, thereby reducing the impact on the function or performance of the smart phone, and using plastics including polycarbonate and glass fiber to inject molding into the aluminum rolled material according to the plastic injection amount, further better ensure that the deformation of the front shell of the mobile phone obtained by the composite plastic molding of the aluminum rolled material is reduced, and better ensure the mechanical properties of the front shell of the mobile phone obtained by the composite plastic molding of the aluminum rolled material. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0038] Figure 1 This is a flow chart of a method for forming an aluminum sheet and plastic composite mobile phone front shell according to one embodiment of the present invention;

[0039] Figure 2 This is a schematic structural diagram of an aluminum sheet and plastic composite mobile phone front shell according to an embodiment of the present invention;

[0040] Figure 3 for Figure 2 A partial view of the front shell of the mobile phone made of aluminum sheet and plastic composite is shown;

[0041] Figure 4 is Figure 3 a cross-sectional view of the aluminum sheet and plastic composite mobile phone front shell shown;

[0042] Figure 5 is Figure 2 another partial view of the aluminum sheet and plastic composite mobile phone front shell shown;

[0043] Figure 6 is Figure 5 a partial enlarged view of the A position of the aluminum sheet and plastic composite mobile phone front shell shown;

[0044] Figure 7 is Figure 2 yet another partial view of the aluminum sheet and plastic composite mobile phone front shell shown;

[0045] Figure 8 a schematic structural view of an injection mold according to an embodiment of the present invention; Figure 9 is Figure 8 a partial cross-sectional view of the injection mold shown. Specific Embodiments

[0046] For ease of understanding the present invention, the present invention will be described more comprehensively below with reference to the relevant drawings. The preferred embodiments of the present invention are shown in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, these embodiments are provided so that the disclosure of the present invention can be understood more thoroughly and comprehensively.

[0047] It should be noted that when an element is referred to as "fixed to" another element, it can be directly on the other element or there may also be an intermediate element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only embodiments.

[0048] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which the present invention belongs. The terms used in the specification of the present invention herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0049] The present application provides a method for forming a composite aluminum sheet and plastic mobile phone front shell. The method for forming the composite aluminum sheet and plastic mobile phone front shell includes the following steps: obtaining injection molding information and milling processing information of an aluminum rolled material, wherein the milling processing information includes a milled hole area and the number of milled holes, and the injection molding information includes the plastic injection amount and the plastic distribution area; performing milling hole processing on the aluminum rolled material by using a high-precision numerical control machine tool to form functional milled holes in the aluminum rolled material; setting bending points according to the milling processing information, where the bending points are the centroids of the areas formed by connecting the centroids of each milled hole area in sequence; setting a bending surface of the aluminum rolled material according to the plastic distribution area, wherein the bending surface is set on the side surface of the aluminum rolled material facing away from the plastic distribution area; performing bending processing on the aluminum rolled material by using a numerical control hydraulic forming machine, with the bending points as the centers, and the periphery of the aluminum rolled material bends upward relative to the bending surface; injecting plastic into the aluminum rolled material according to the plastic injection amount to form plastic at the plastic distribution area of the aluminum rolled material, wherein the plastic includes polycarbonate and glass fiber.

[0050] In the above method for forming a composite aluminum sheet and plastic mobile phone front shell, the mobile phone front shell is formed by compounding an aluminum rolled material with plastic, which initially reduces the deformation of the mobile phone front shell formed by compounding the aluminum rolled material with plastic; and a high-precision numerical control machine tool is used to perform milling hole processing on the aluminum rolled material, which preferably ensures the accuracy of the functional milled holes. Furthermore, on the basis of optimizing signal transmission and the effective installation of electronic devices, the area and number of functional milled holes are reduced, thereby preferably reducing the influence on the structural strength of the aluminum rolled material and further reducing the deformation of the mobile phone front shell formed by compounding the aluminum rolled material with plastic. In addition, by obtaining the injection molding information and milling processing information of the aluminum rolled material, the bending points and the bending surface are respectively set. The bending points are the centroids of the areas formed by connecting the centroids of each milled hole area in sequence, and the bending surface is set on the side surface of the aluminum rolled material facing away from the plastic distribution area. And in cooperation with using a numerical control hydraulic forming machine to perform bending processing on the aluminum rolled material, that is, pre-deforming the aluminum rolled material in the mobile phone front shell, setting the bending surface and the bending points as pre-deformation parameters, using a numerical control hydraulic forming machine, a force can be applied with high precision centered on the bending points, and an aluminum rolled material with a high-precision bending degree can be obtained, so as to better realize the stress homogenization of the aluminum rolled material in the mobile phone front shell during the compounding of the aluminum rolled material with plastic. Furthermore, it preferably ensures that the deformation of the mobile phone front shell formed by compounding the aluminum rolled material with plastic is reduced, or enables the deformation of the mobile phone front shell to be better repaired under shaping treatment, thereby reducing the influence on the functions or performance of the smart phone. And plastic including polycarbonate and glass fiber is injected and formed at the aluminum rolled material according to the plastic injection amount, which further preferably ensures that the deformation of the mobile phone front shell formed by compounding the aluminum rolled material with plastic is reduced, and preferably ensures the mechanical properties of the mobile phone front shell formed by compounding the aluminum rolled material with plastic.

[0051] To better understand the forming method of the aluminum sheet and plastic composite mobile phone front shell of the present application, the following further explains the forming method of the aluminum sheet and plastic composite mobile phone front shell of the present application:

[0052] Please refer to Figure 1 , the forming method of the aluminum sheet and plastic composite mobile phone front shell in an embodiment includes the following steps:

[0053] S100. Obtain the injection molding information and milling processing information of the aluminum rolled material. Among them, the milling processing information includes the milling hole area and the number of milling holes, and the injection molding information includes the plastic injection amount and the plastic distribution area.

[0054] It can be understood that since the aluminum rolled material is a rolled aluminum alloy profile with good structural strength, therefore, using the aluminum rolled material for composite plastic molding to obtain the mobile phone front shell initially reduces the deformation of the mobile phone front shell obtained by composite plastic molding of the aluminum rolled material; the milling processing information includes the milling hole area and the number of milling holes. The milling hole area is the window area opened for optimizing signal transmission and the installation of electronic devices on the mobile phone front shell formed by composite molding of the aluminum rolled material. The milling hole areas are dispersed at multiple positions of the aluminum rolled material, and the areas of the milling hole areas at each position are different or partially the same, and the number of milling holes is the number of milling hole areas; the injection molding information includes the plastic injection amount and the plastic distribution area. The plastic distribution area is the spatial distribution area of the plastic part of the mobile phone front shell formed by composite molding of the aluminum rolled material. The plastic molding is mainly formed on the periphery and one side of the aluminum rolled material in the mobile phone front shell, that is, the plastic part area is mainly distributed on one side of the aluminum rolled material, and the plastic injection amount is the plastic amount required to completely fill the plastic part area. Therefore, both the milling processing information and the injection molding information are the information determined through the design of the mobile phone front shell and before the processing of the mobile phone front shell is completed.

[0055] S200. Use a high-precision numerical control machine tool to perform milling hole processing on the aluminum rolled material to form functional milling holes on the aluminum rolled material.

[0056] It can be understood that the functional gong holes are window areas opened in the front shell of the mobile phone for composite molding of aluminum rolled materials in order to optimize signal transmission and the installation of electronic devices. Therefore, the functional gong holes are set one by one corresponding to the gong hole areas, and the actual functional gong holes are processed according to the gong hole areas. Furthermore, since the role of the functional gong holes is to optimize the transmission of signals and the installation of electronic devices, and in order to ensure the structural strength of the aluminum rolled materials, the accuracy of the gong holes will be improved when designing the front shell of the mobile phone, so as to reduce the area and number of functional gong holes on the basis of optimizing the transmission of signals and the effective installation of electronic devices. When processing the gong holes, high-precision CNC machine tools are used to form functional gong holes on the aluminum rolled materials, which better ensures the accuracy of the functional gong holes, and then optimizes the transmission of signals and the effective installation of electronic devices, while reducing the area and number of functional gong holes, thereby better reducing the influence of the structural strength of the aluminum rolled materials, and further reducing the deformation of the front shell of the mobile phone obtained by composite plastic molding of aluminum rolled materials.

[0057] S300, setting an arch bending point according to the gong processing information, where the arch bending point is the centroid of the area surrounded by the centroids of each gong hole area connected in sequence.

[0058] It is understandable that, since the distribution of plastic on the aluminum rolled material in the front shell of the mobile phone is irregular and mainly concentrated on one side of the aluminum rolled material in the front shell of the mobile phone, combined with the different thermal stresses of the aluminum rolled material and the plastic, the aluminum rolled material will be deformed when the plastic is cooled and formed. Generally, the deformation of the aluminum rolled material is reduced by increasing the structural strength of the aluminum rolled material. However, in fact, due to the small thickness of the aluminum rolled material used in the front shell of the mobile phone, even if reinforcing ribs are added to enhance the structural strength of the aluminum rolled material, it is actually limited by the thinness of the mobile phone and the limited space of the front shell of the mobile phone. After it is used for the installation of electronic devices, there is no large space for adding reinforcing ribs, which makes the reinforcing ribs ineffective for achieving the structural strength of the aluminum rolled material. The enhancement of strength has limitations and cannot effectively enhance the structural strength of aluminum rolled products. In the present application, an arch bending point is set on the aluminum rolled product, and the arch bending point is the centroid of the area surrounded by the centroids of each gong hole area connected in sequence. The centroid is an important geometric attribute of a plane figure, which can be understood as the "center" of the area of ​​the plane figure, that is, the average position of all points in the figure. Specifically, the centroid of each gong hole area is the "center" of each gong hole area, and the area formed by the centroids of each gong hole area connected in sequence is the closed area surrounded by the centroid of each gong hole area and the centroids of the two adjacent gong hole areas closest to each other connected by a straight line, and the "center" of the closed area is the centroid.

[0059] S400, setting the arched surface of the aluminum rolled material according to the plastic distribution area, wherein the arched surface is set on a side surface of the aluminum rolled material away from the plastic distribution area.

[0060] It can be understood that plastic molding is mainly formed on the periphery and one side of the aluminum rolled material in the front shell of the mobile phone. Therefore, according to the plastic distribution area, the side of the aluminum rolled material away from the plastic distribution area can be better obtained, and it is set as an arched surface. Then, when the plastic is filled in the plastic distribution area, the stress of the plastic during cooling and molding is mainly distributed on the side away from the arched surface, so that the periphery of the aluminum rolled material is easy to warp toward the plastic distribution area. In addition, since the plastic distribution area on the aluminum rolled material in the front shell of the mobile phone is irregular, it is easy to cause the local irregular warping of the aluminum rolled material. Therefore, when the structural strength of the aluminum rolled material is partially enhanced, due to the plastic distribution area, the stress of the plastic distribution area is mainly distributed on the side away from the arched surface. The stress distribution of molded plastic is difficult to analyze accurately, and due to the space limitation of the front shell of the mobile phone, it is difficult to enhance the local structural strength of the aluminum rolled material. Therefore, in order to reduce the deformation of the front shell of the mobile phone, the aluminum rolled material in the front shell of the mobile phone is pre-deformed, and the arch bending surface and the arch bending point are set as pre-deformation parameters to better achieve the stress uniformity of the aluminum rolled material composite plastic molding in the front shell of the mobile phone, thereby further ensuring that the deformation of the front shell of the mobile phone obtained by molding the aluminum rolled material composite plastic is reduced, or the deformation of the front shell of the mobile phone can be better repaired through plastic treatment, thereby improving the yield rate of the front shell of the mobile phone.

[0061] S500, a CNC hydraulic forming machine is used to perform arch bending processing on the aluminum rolled material, with the arch bending point as the center, and the periphery of the aluminum rolled material is bent upward relative to the arch bending surface.

[0062] It can be understood that the aluminum rolled material is subjected to arch bending treatment, which is to apply force with the arch bending point as the center position, so that the periphery of the aluminum rolled material is bent to one side of the arch bending surface, that is, the periphery of the aluminum rolled material is bent upward relative to the arch bending surface. Due to the use of a CNC hydraulic forming machine, force can be applied with the arch bending point as the center position with high precision, and aluminum rolled material with a high degree of arch bending can be obtained. The arch bending treatment not only improves the structural strength of the aluminum rolled material, but also ensures that the stress to which the aluminum rolled material is subjected during composite molding of plastic is uniform, thereby reducing the deformation of the aluminum rolled material, or the deformation of the front shell of the mobile phone can be better repaired through the plastic molding treatment, thereby improving the yield rate of the front shell of the mobile phone.

[0063] S600, injecting plastic into the aluminum rolled material according to the plastic injection amount, so as to shape the plastic in the plastic distribution area of ​​the aluminum rolled material, wherein the plastic includes polycarbonate and glass fiber.

[0064] It can be understood that the plastic includes polycarbonate and glass fiber, the glass fiber has higher hardness and its thermal stress is similar to that of aluminum rolled material, but the glass fiber is more brittle. Therefore, in order to better reduce the deformation of the front shell of the mobile phone and ensure the mechanical properties of the front shell of the mobile phone, the plastic includes polycarbonate and glass fiber, which further better ensures that the deformation of the front shell of the mobile phone obtained by aluminum rolled material composite plastic molding is reduced, and better ensures the mechanical properties of the front shell of the mobile phone obtained by aluminum rolled material composite plastic molding, such as strength, stiffness and impact resistance.

[0065] The above-mentioned method for forming a composite mobile phone front shell of aluminum sheet and plastic adopts aluminum rolled material composite plastic molding to obtain a mobile phone front shell, which preliminarily reduces the deformation of the mobile phone front shell obtained by aluminum rolled material composite plastic molding; and adopts a high-precision CNC machine tool to perform gong hole processing on the aluminum rolled material, which better ensures the accuracy of the functional gong holes, thereby achieving the optimization of transmission signals and effective installation of electronic devices, reducing the area and number of functional gong holes, thereby better reducing the influence of the structural strength of the aluminum rolled material, and further reducing the deformation of the mobile phone front shell obtained by aluminum rolled material composite plastic molding. In addition, the arch bending point and the arch bending surface are set respectively by obtaining the injection molding information and gong processing information of the aluminum rolled material. The arch bending point is the centroid of the area surrounded by the centroid of each gong hole area connected in sequence, and the arch bending surface is set on the side surface of the aluminum rolled material away from the plastic distribution area, and the aluminum rolled material is processed by a CNC hydraulic forming machine. Arch bending treatment, that is, pre-deforming the aluminum rolled material in the front shell of the mobile phone, setting the arch bending surface and the arch bending point as pre-deformation parameters, using a CNC hydraulic forming machine, which can apply force with the arch bending point as the center position with high precision, and obtain aluminum rolled material with high precision arch bending degree, so as to better realize the stress uniformity of the aluminum rolled material in the front shell of the mobile phone during composite plastic molding, and further better ensure that the deformation of the front shell of the mobile phone obtained by the composite plastic molding of the aluminum rolled material is reduced, or the deformation of the front shell of the mobile phone can be better repaired under the plastic molding treatment, thereby reducing the impact on the function or performance of the smart phone, and using plastics including polycarbonate and glass fiber to inject molding into the aluminum rolled material according to the plastic injection amount, further better ensure that the deformation of the front shell of the mobile phone obtained by the composite plastic molding of the aluminum rolled material is reduced, and better ensure the mechanical properties of the front shell of the mobile phone obtained by the composite plastic molding of the aluminum rolled material.

[0066] It should be noted that due to the processing of aluminum rolled materials and the limited space of mobile phones, it is difficult to achieve local structural reinforcement of aluminum rolled materials. Based on the mechanical strength of the front shell of the mobile phone, the thermal stress difference between plastic and aluminum rolled materials is difficult to eliminate. Therefore, in the present application, the arch bending point and the arch bending surface are set respectively by obtaining the injection molding information and the gong processing information of the aluminum rolled materials. The arch bending point is the centroid of the area surrounded by the centroids of each gong hole area connected in sequence, and the arch bending surface is set on the side surface of the aluminum rolled material away from the plastic distribution area, and the aluminum rolled material is arched by a CNC hydraulic forming machine. That is, on the basis of improving the structural strength of the aluminum rolled material, the stress uniformity of the aluminum rolled material composite plastic in the front shell of the mobile phone is achieved during molding. In this way, the irregular deformation of the front shell of the mobile phone is reduced, and the deformation degree of the front shell of the mobile phone is also reduced, so that the deformation of the front shell of the mobile phone can be better repaired under the plastic shaping treatment, thereby reducing the impact on the function or performance of the smart phone.

[0067] It should also be noted that the functional gong holes of aluminum rolled materials have a great influence on the structural strength of aluminum rolled materials, that is, the functional gong holes formed on the aluminum rolled materials have a large influence on the structural strength of the aluminum rolled materials, especially the positions where the gong holes are densely packed and the gong holes are large in area. When the aluminum rolled materials are composited with plastics for molding, they are most affected by the molding stress of the plastics, which can easily cause partial bending, twisting or warping of the front shell of the mobile phone. At this time, it is difficult to repair even through plastic treatment. Therefore, in the present application, the arch bending point and the arch bending surface are set respectively by obtaining the injection molding information and the gong processing information of the aluminum rolled materials, and the arch bending point is each The centroids of the gong hole areas are connected in sequence to form the centroids of the areas enclosed, and the arch surface is set on the side of the aluminum rolled material away from the plastic distribution area, and the aluminum rolled material is arched by a CNC hydraulic forming machine. That is, on the basis of improving the structural strength of the aluminum rolled material, the stress of the aluminum rolled material in the front shell of the mobile phone during composite plastic molding is uniformed. In this way, the irregular deformation of the front shell of the mobile phone is reduced, and the deformation degree of the front shell of the mobile phone is also reduced, so that the deformation of the front shell of the mobile phone can be better repaired under the plastic treatment, thereby reducing the impact on the function or performance of the smart phone.

[0068] It should also be noted that if the step of using a high-precision CNC machine tool to perform grooving processing on the aluminum rolled material is performed after the step of injecting plastic into the aluminum rolled material according to the plastic injection amount, then during the mechanical grooving, the milling cutter will exert force on the aluminum rolled material, and the force exerted on the aluminum rolled material may be transmitted to the bonding surface between the plastic and the aluminum sheet through the aluminum sheet, resulting in uneven force on the bonding surface, causing stratification or cracking between the aluminum rolled material and the plastic, affecting the waterproofness of the front shell of the mobile phone obtained by molding the aluminum rolled material and the composite plastic.

[0069] In one embodiment, the content of glass fiber is 10% - 30%. Further, the content of glass fiber is 20%. It can be understood that when the content of glass fiber is 10% - 30%, on the basis of ensuring the mechanical strength of the mobile phone front shell well, the thermal stress difference between the aluminum rolled material and the plastic is reduced well, and further the deformation of the mobile phone front shell obtained by molding the aluminum rolled material and the plastic is reduced well.

[0070] In one embodiment, the thickness of the aluminum rolled material is 0.25 mm - 0.8 mm. It can be understood that in order to better realize the thinness and lightness of the mobile phone, for the aluminum rolled material with a thickness of 0.25 mm - 0.8 mm, the molding method applied to the mobile phone front shell of the aluminum sheet and plastic composite type can effectively reduce the deformation of the mobile phone front shell.

[0071] In one embodiment, the arch height at the arch bending point is 0.5 mm - 2.0 mm. It can be understood that for the aluminum rolled material with a thickness of 0.25 mm - 0.8 mm, the molding method applied to the mobile phone front shell of the aluminum sheet and plastic composite type, combined with the arch height at the arch bending point of 0.5 mm - 2.0 mm, can further effectively reduce the deformation of the mobile phone front shell.

[0072] In one embodiment, the arch bending point is located on the line connecting the centroid of the region formed by connecting the centroids of each percussion hole region in sequence and the centroid of the percussion hole region with the largest area, and the distance between the arch bending point and the centroid of the region formed by connecting the centroids of each percussion hole region in sequence is 0.01 cm - 0.15 cm. It can be understood that the larger the area of the percussion hole region, the greater the influence on the structural strength of the aluminum rolled material. By connecting the centroid of the closed region and the centroid of the percussion hole region with the largest area in a straight line, and taking the point within the range of 0.01 cm - 0.15 cm from the centroid of the closed region on the straight line as the arch bending point, the structural strength of the aluminum rolled material can be further improved, and the stress uniformity during the molding of the aluminum rolled material and plastic in the mobile phone front shell can be further improved.

[0073] In one embodiment, after the step of obtaining the injection molding information of the aluminum rolled material and before the step of performing hole milling on the aluminum rolled material using a high-precision numerical control machine tool, the forming method of the aluminum sheet and plastic composite mobile phone front shell further includes the following steps: performing a flanging process on the aluminum rolled material so that four reinforcing vertical edges are formed on the periphery of the aluminum rolled material, and each reinforcing vertical edge protrudes from the arched surface. Further, each reinforcing vertical edge includes at least one corresponding segment and at least one offset segment connected to each other. In the length and width directions of the aluminum rolled material, the corresponding segment of each reinforcing vertical edge is arranged corresponding to the hole milling area. It can be understood that in the length and width directions of the aluminum rolled material, the corresponding segment of each reinforcing vertical edge is arranged corresponding to the hole milling area, that is, it can be understood that countless straight lines are arranged along the length and width directions of the aluminum profile, so that countless grids are formed on the aluminum profile. The frame lines of the grids occupied by the hole milling area extend along the length and width directions of the aluminum profile to each reinforcing vertical edge. At this time, the reinforcing vertical edge corresponding to the length intercepted by the frame line on each reinforcing vertical edge is the corresponding segment, and the remaining reinforcing vertical edge is the offset segment; the setting of the reinforcing vertical edge further improves the structural strength of the aluminum rolled material, and further reduces the deformation of the aluminum rolled material.

[0074] In one embodiment, after the step of performing a flanging process on the aluminum rolled material and before the step of performing hole milling on the aluminum rolled material using a high-precision numerical control machine tool, the forming method of the aluminum sheet and plastic composite mobile phone front shell further includes the following steps:

[0075] Set the hole milling positions of the aluminum rolled material according to the hole milling information. The hole milling positions are linearly arranged along the length direction of each reinforcing vertical edge. The distance between every two adjacent hole milling positions at the offset segment of each reinforcing vertical edge is 0.8 cm to 1.0 cm. The distance between every two adjacent hole milling positions at the corresponding segment of each reinforcing vertical edge is inversely proportional to the area of the corresponding hole milling area. The distance between every two adjacent hole milling positions at the corresponding segment of each reinforcing vertical edge increases by 0.03 cm to 0.08 cm for every 0.05 cm 2 increase in the area of the corresponding hole milling area.

[0076] It can be understood that the positions where the functional milling holes exist on the aluminum rolled material are particularly prone to deformation. When the aluminum rolled material is compounded with plastic to form the front shell of the mobile phone, the front shell of the mobile phone is prone to bending, torsion and local warping. It is difficult to set the strengthening vertical edge to completely offset the influence of the stress of the plastic with the structural strength of the aluminum rolled material. Due to the existence of the functional milling holes on the aluminum rolled material, the front shell of the mobile phone formed by compounding the aluminum rolled material with plastic is prone to bending, torsion and local warping. At this time, it is difficult to repair even through shaping treatment. Further, the aluminum rolled material is subjected to arch bending treatment by designing the arch bending point and the arch bending surface. On the basis of promoting the uniformity of the stress received by the aluminum rolled material during the compound plastic molding, due to the limitation of the arch bending degree of the aluminum rolled material, otherwise, when the aluminum rolled material is compounded with plastic to form the front shell of the mobile phone, the aluminum rolled material in the front shell of the mobile phone cannot be restored to flatness, that is, although the bending, torsion and local warping of the front shell of the mobile phone can be reduced, for the relatively thin aluminum profile, the reduction of the bending, torsion and local warping of the front shell of the mobile phone still needs to be further improved to better ensure that the front shell of the mobile phone can be better repaired under the shaping treatment. In this application, in order to further improve the bending, torsion and local warping of the front shell of the mobile phone, the milling hole positions of the aluminum rolled material are set according to the milling processing information, and the milling hole positions are linearly arranged along the length direction of each strengthening vertical edge. The distance between every two adjacent milling hole positions at the staggered section of each strengthening vertical edge is 0.8 cm to 1.0 cm. The distance between every two adjacent milling hole positions at the corresponding section of each strengthening vertical edge is inversely proportional to the area of the corresponding milling hole area. The distance between every two adjacent milling hole positions at the corresponding section of each strengthening vertical edge increases by 0.03 cm to 0.08 cm for every 0.05 cm 2 increase of the area of the corresponding milling hole area, that is, by reducing the setting of the milling hole positions on the corresponding section of each strengthening vertical edge. Specifically, the distance between every two adjacent milling hole positions at the corresponding section of each strengthening vertical edge is inversely proportional to the area of the corresponding milling hole area. The distance between every two adjacent milling hole positions at the corresponding section of each strengthening vertical edge increases by 0.03 cm to 0.08 cm for every 0.05 cm 2 increase of the area of the corresponding milling hole area. In this way, the uniformity of the stress received by the aluminum rolled material during the compound plastic molding is further improved, and further, the deformation of the front shell of the mobile phone formed by compounding the aluminum rolled material with plastic is reduced, that is, the bending, torsion and local warping of the front shell of the mobile phone are further reduced, so that the deformation of the front shell of the mobile phone can be better repaired under the shaping treatment, thus reducing the influence on the functions or performance of the smart phone.

[0077] Further, a high-precision numerical control machine tool is used to perform the first-level milling treatment on the aluminum rolled material to form the first glue-flowing milling holes at the milling hole positions.

[0078] It can be understood that the first-level milling of aluminum rolled materials using a high-precision numerical control machine tool ensures the milling accuracy of the first-class glue-flowing milling holes, thereby better ensuring the reduction of bending, torsion, and local warping of the mobile phone front shell, enabling better repair of the deformation of the mobile phone front shell under shaping treatment, and thus reducing the impact on the functions or performance of the smart phone.

[0079] In the above design of the reinforcing vertical edge in cooperation with the milling hole positions, the distance between every two adjacent milling hole positions at the dislocation section of each reinforcing vertical edge is 0.8 cm to 1.0 cm. The distance between every two adjacent milling hole positions at the corresponding section of each reinforcing vertical edge is inversely proportional to the area of the corresponding milling hole region. The distance between every two adjacent milling hole positions at the corresponding section of each reinforcing vertical edge increases by 0.03 cm to 0.08 cm for every 0.05 cm 2 increase in the area of the corresponding milling hole region, further improving the uniformity of the stress received during the composite plastic molding of the aluminum rolled material, and further reducing the deformation of the mobile phone front shell obtained by the composite plastic molding of the aluminum rolled material, that is, further reducing the bending, torsion, and local warping of the mobile phone front shell, enabling better repair of the deformation of the mobile phone front shell under shaping treatment, and thus reducing the impact on the functions or performance of the smart phone.

[0080] In one of the embodiments, after the step of performing the first-level milling of the aluminum rolled material using a high-precision numerical control machine tool and before the step of performing the milling hole processing on the aluminum rolled material using a high-precision numerical control machine tool, the forming method of the aluminum sheet and plastic composite mobile phone front shell further includes the following steps: performing a second-level milling on the aluminum rolled material using a high-precision numerical control machine tool to form a plurality of second glue-flowing milling holes at the connection between each of the reinforcing vertical edges and the corresponding reinforcing folded edges. The plurality of second glue-flowing milling holes are linearly and evenly arranged along the length direction of each reinforcing vertical edge, and each second glue-flowing milling hole is arranged in a dislocation manner with each first glue-flowing milling hole. It can be understood that in the region where the aluminum rolled material abuts each reinforcing vertical edge, which is the turning edge line of the aluminum rolled material, that is, the connection between the aluminum rolled material and the reinforcing vertical edge, forming the second glue-flowing milling holes by using a high-precision numerical control machine tool for milling holes is beneficial to improving the tightness of the fit between the aluminum rolled material and the plastic during the composite plastic molding of the aluminum rolled material, and ensuring the stable cancellation of the pre-deformation of the plastic on the aluminum rolled material.

[0081] In one embodiment, after the step of flanging the aluminum rolled material and before the step of setting the milling hole positions of the aluminum rolled material according to the milling processing information, the forming method of the aluminum sheet and plastic composite mobile phone front shell further includes the following steps: performing hemming on each reinforcing vertical edge so that each reinforcing vertical edge is bent along a folding line to form a reinforcing hem, the extending direction of each folding line being the same as the length direction of the corresponding reinforcing vertical edge, the reinforcing hem of each reinforcing vertical edge being arranged away from the aluminum rolled material, and the milling hole positions being arranged at the folding lines. It can be understood that further hemming the reinforcing vertical edges further strengthens the structural strength of the aluminum rolled material and prompts the milling hole positions to be arranged at the hems, reducing the influence on the structural strength of the aluminum rolled material after the formation of the first glue overflow holes, further reducing the deformation of the mobile phone front shell obtained by compounding the aluminum rolled material with plastic, and thus reducing the influence on the functions or performance of the smart phone.

[0082] In one embodiment, the height of the reinforcing vertical edge is 0.5 mm to 1.5 mm, which can preferably ensure the effective improvement of the structural strength of the aluminum rolled material while reducing the influence on the size of the mobile phone front shell.

[0083] This application also provides an aluminum sheet and plastic composite mobile phone front shell prepared by the forming method of the aluminum sheet and plastic composite mobile phone front shell in any of the above embodiments. To better understand the aluminum sheet and plastic composite mobile phone front shell of this application, the following further explanatory description is made on the aluminum sheet and plastic composite mobile phone front shell of this application:

[0084] Please refer to Figures 2 to 4 , an aluminum sheet and plastic composite mobile phone front shell 10 in one embodiment includes an aluminum rolled main body 110 and a plastic molded body 120. A plurality of functional milling holes 101 are provided on the aluminum rolled main body 110, and the centroids of the plurality of functional milling holes 101 are connected in sequence to enclose an arched bending area 102. The plastic molded body 120 is integrally injection molded on the aluminum rolled main body 110. An arched bending surface 103 is provided on the side of the aluminum rolled main body 110 away from the plastic molded body 120. The aluminum rolled main body 110 takes the centroid of the arched bending area 102 as the arched bending point 104, so that the periphery of the aluminum rolled main body 110 bends upward relative to the arched bending surface 103.

[0085] The above-mentioned aluminum sheet and plastic composite mobile phone front shell 10 has a plurality of functional milling holes 101 provided on the aluminum rolling main body 110, realizing optimized signal transmission and effective installation of electronic devices. The centroids of the plurality of functional milling holes 101 are sequentially connected to enclose an arched bending area 102. The aluminum rolling main body 110 takes the centroid of the arched bending area 102 as the arched bending point 104, so that the periphery of the aluminum rolling main body 110 bends upward relative to the arched bending surface 103, that is, a force is applied with the arched bending point 104 as the central position, so that the periphery of the aluminum rolling material bends toward one side of the arched bending surface 103, that is, the periphery of the aluminum rolling material bends upward relative to the arched bending surface 103. This not only improves the structural strength of the aluminum rolling material, but also ensures the stress uniformity when the aluminum rolling material is compounded with plastic, thereby reducing the deformation of the aluminum rolling material, or enabling better repair of the deformation of the mobile phone front shell under shaping treatment, thus improving the yield rate of the mobile phone front shell.

[0086] Please refer to Figures 5 to 7 , in one of the embodiments, the aluminum sheet and plastic composite mobile phone front shell 10 further includes four strengthening vertical edges 130 and four strengthening folding edges 140. Further, the four strengthening vertical edges 130 are arranged along the periphery of the aluminum rolling main body 110, and each strengthening vertical edge 130 is erected on the arched bending surface 103 of the aluminum rolling main body 110. The four strengthening folding edges 140 are arranged in one-to-one correspondence with the four strengthening vertical edges 130. Each strengthening folding edge 140 is connected to the side of the corresponding strengthening vertical edge 130 away from the arched bending surface 103, and each strengthening folding edge 140 is located on the side of the strengthening vertical edge 130 away from the aluminum rolling main body 110. A plurality of first glue-flowing milling holes 105 are provided at the connection between each strengthening vertical edge 130 and the aluminum rolling material. A plurality of second glue-flowing milling holes 106 are provided at the connection between each strengthening vertical edge 130 and the corresponding strengthening folding edge 140. The plurality of first glue-flowing milling holes 105 and the plurality of second glue-flowing milling holes 106 are both arranged along the length direction of the strengthening vertical edge 130, and each first glue-flowing milling hole 105 is arranged in a staggered manner with each second glue-flowing milling hole 106, further improving the structural strength of the aluminum rolling material.

[0087] In one of the embodiments, the arched bending point is located on the line connecting the centroid of the area enclosed by the centroids of each functional milling hole in sequence and the centroid of the functional milling hole with the largest aperture, and the distance between the arched bending point and the centroid of the area enclosed by the centroids of each functional milling hole in sequence is 0.01 cm to 0.15 cm.

[0088] Please refer to Figures 5 to 7, in one embodiment, each reinforcing vertical edge 130 includes at least one corresponding segment 131 and at least one offset segment 132 that are connected. In the length and width directions of the aluminum rolling main body 110, the corresponding segment 131 of each reinforcing vertical edge 130 is correspondingly arranged with the functional milling hole 101. Further, the distance between every two adjacent first resin overflow milling holes 105 at the corresponding segment 131 of each reinforcing vertical edge 130 increases by 0.03 cm to 0.08 cm for every 0.05 cm increase in the opening area of the corresponding functional milling hole 101. 2 The increase is 0.03 cm to 0.08 cm.

[0089] This application also provides an injection mold, which is used to inject plastic into the aluminum rolled material according to the plastic injection amount, so that plastic is formed at the plastic distribution area of the aluminum rolled material, and the aluminum sheet and plastic composite mobile phone front shell 10 of any of the above embodiments are obtained. To better understand the injection mold of this application, the injection mold of this application will be further explained as follows:

[0090] Please refer to Figures 8 to 9 , an injection mold 20 of an embodiment includes a moving mold 210 and a fixed mold 220. The moving mold 210 can move in a direction close to or away from the fixed mold 220. An arched support surface 201 is provided on the side surface of the fixed mold 220 close to the moving mold 210. When the fixed mold 220 and the moving mold 210 are clamped, an injection molding cavity 202 is formed. The arched support surface 201 is located in the injection molding cavity 202. The injection molding cavity 202 is used to accommodate the aluminum rolling main body. The arched support surface 201 is used to abut against the side of the aluminum rolling profile away from the arched surface, and the injection molding cavity 202 is used to inject plastic and integrally form a plastic molded body on the aluminum rolling main body.

[0091] For the above injection mold 20, the injection molding cavity 202 is used to accommodate the aluminum rolling main body, the arched support surface 201 is used to abut against the side of the aluminum rolling profile away from the arched surface, and the injection molding cavity 202 is used to inject plastic and integrally form a plastic molded body on the aluminum rolling main body, which preferably realizes the effective forming and preparation of the aluminum sheet and plastic composite mobile phone front shell.

[0092] When the injection mold is used to process the mobile phone front shell, the aluminum rolled material is placed in the injection molding cavity, and the arched support surface is used to abut against the side of the aluminum rolling profile away from the arched surface. At this time, when the aluminum rolled material meets any of the above parameters, after the demolded mobile phone front shell is subjected to shaping treatment, the qualified product rate is greater than 99.99%.

[0093] Compared with the prior art, the present invention has at least the following advantages:

[0094] The forming method of the aluminum sheet and plastic composite mobile phone front shell 10 of the present invention adopts aluminum rolled material composite plastic molding to obtain the mobile phone front shell, which preliminarily reduces the deformation of the mobile phone front shell obtained by the aluminum rolled material composite plastic molding; and adopts a high-precision CNC machine tool to perform gong hole processing on the aluminum rolled material, which better ensures the accuracy of the functional gong holes, thereby achieving the optimization of transmission signals and effective installation of electronic devices, reducing the area and number of functional gong holes, thereby better reducing the influence of the structural strength of the aluminum rolled material, and further reducing the deformation of the mobile phone front shell obtained by the aluminum rolled material composite plastic molding. In addition, the arch bending point 104 and the arch bending surface 103 are respectively set by obtaining the injection molding information and gong processing information of the aluminum rolled material. The arch bending point 104 is the centroid of the area surrounded by the centroid of each gong hole area connected in sequence, and the arch bending surface 103 is set on the side surface of the aluminum rolled material away from the plastic distribution area, and the aluminum rolled material is processed by a CNC hydraulic forming machine. The material is subjected to arch bending treatment, that is, the aluminum rolled material in the front shell of the mobile phone is pre-deformed, and the arch bending surface 103 and the arch bending point 104 are set as pre-deformation parameters. A CNC hydraulic forming machine is used, which can apply force with the arch bending point 104 as the center position with high precision, and obtain an aluminum rolled material with a high degree of arch bending, so as to better realize the stress uniformity of the aluminum rolled material in the front shell of the mobile phone during the composite plastic molding, and further better ensure that the deformation of the mobile phone front shell obtained by the aluminum rolled material composite plastic molding is reduced, or the deformation of the mobile phone front shell can be better repaired under the plastic molding treatment, thereby reducing the impact on the function or performance of the smart phone, and using plastics including polycarbonate and glass fiber to inject molding into the aluminum rolled material according to the plastic injection amount, further better ensure that the deformation of the mobile phone front shell obtained by the aluminum rolled material composite plastic molding is reduced, and better ensure the mechanical properties of the mobile phone front shell obtained by the aluminum rolled material composite plastic molding. The above embodiments only express several implementation methods of the present invention, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the invention patent. It should be noted that, for those skilled in the art, several modifications and improvements can be made without departing from the concept of the present invention, and these modifications and improvements 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 method for forming a composite mobile phone front shell of aluminum sheet and plastic, characterized in that: The steps include: Acquire injection molding information and gong processing information of aluminum rolled material, wherein the gong processing information includes the gong hole area and the number of gong holes, and the injection molding information includes the plastic injection amount and the plastic distribution area; The aluminum rolled material is subjected to flanging treatment so that four reinforcing vertical edges are formed on the periphery of the aluminum rolled material, and each of the reinforcing vertical edges protrudes from the arched curved surface; Performing a folding process on each of the reinforcing vertical edges, so that each of the reinforcing vertical edges is bent along a fold line to form a reinforcing folded edge, and the extending direction of each of the fold lines is the same as the length direction of the corresponding reinforcing vertical edge; The gong hole position of the aluminum rolled material is set according to the gong processing information, the gong hole position is linearly arranged along the length direction of each of the reinforced vertical edges, the reinforced folded edge of each of the reinforced vertical edges is arranged away from the aluminum rolled material, and the gong hole position is set at the fold line; A high-precision CNC machine tool is used to perform a first-stage milling process on the aluminum rolled material to form a first-flow rubber gong hole at the gong hole position; A high-precision CNC machine tool is used to perform secondary milling on the aluminum rolled material to form a plurality of second glue flow gong holes at the connection between each of the reinforcing vertical edges and the corresponding reinforcing folded edges, wherein the plurality of second glue flow gong holes are linearly and evenly arranged along the length direction of each of the reinforcing vertical edges, and each of the second glue flow gong holes is staggered with each of the first glue flow gong holes; Using a high-precision CNC machine tool to perform gong hole processing on the aluminum rolled material to form a functional gong hole on the aluminum rolled material; Setting an arch bending point according to the gong processing information, wherein the arch bending point is the centroid of an area formed by connecting the centroids of each gong hole area in sequence; The arched surface of the aluminum rolled material is set according to the plastic distribution area, wherein the arched surface is set on a side surface of the aluminum rolled material away from the plastic distribution area; The aluminum rolled material is subjected to an arch bending process by using a numerically controlled hydraulic forming machine, and the periphery of the aluminum rolled material is bent upward relative to the arch bending surface with the arch bending point as the center; Plastic is injected into the aluminum rolled material according to the plastic injection amount, so that the plastic is formed in the plastic distribution area of ​​the aluminum rolled material, wherein the plastic includes polycarbonate and glass fiber.

2. The method for forming the aluminum sheet and plastic composite mobile phone front shell according to claim 1, characterized in that: The content of the glass fiber is 10% to 30%; and / or, The thickness of the aluminum rolled material is 0.25 mm to 0.8 mm; and / or, The arch height at the arch point is 0.5mm~2.0mm.

3. The method for forming the aluminum sheet and plastic composite mobile phone front shell according to claim 1, characterized in that: The arch bending point is located on the line connecting the centroid of the area surrounded by the centroids of each gong hole area and the centroid of the gong hole area with the largest area, and the distance between the arch bending point and the centroid of the area surrounded by the centroids of each gong hole area is 0.01cm~0.15cm.

4. The method for forming the aluminum sheet and plastic composite mobile phone front shell according to claim 1, characterized in that: Each reinforced vertical edge includes at least one corresponding segment and at least one offset segment connected to each other, and in the length and width direction of the aluminum rolled material, the corresponding segment of each reinforced vertical edge is arranged corresponding to the gong hole area; The distance between each adjacent two gong holes at the offset section of each reinforced vertical edge is 0.8 cm to 1.0 cm, and the distance between each adjacent two gong holes at the corresponding section of each reinforced vertical edge is inversely proportional to the area of ​​the corresponding gong hole area. The distance between each adjacent two gong holes at the corresponding section of each reinforced vertical edge increases with the area of ​​the corresponding gong hole area for every 0.05 cm 2 Increase by 0.03cm~0.08cm.

5. The method for forming a composite mobile phone front shell of aluminum sheet and plastic according to claim 1, characterized in that: The height of the reinforced vertical edge is 0.5mm~1.5mm.

6. A composite mobile phone front shell of aluminum sheet and plastic, characterized in that: Prepared by the molding method of the aluminum sheet and plastic composite mobile phone front shell according to any one of claims 1 to 5; The aluminum sheet and plastic composite mobile phone front shell comprises: An aluminum rolling body, wherein a plurality of functional gong holes are provided on the aluminum rolling body, and the centroids of the plurality of functional gong holes are sequentially connected to form an arched area; A plastic molded body, wherein the plastic molded body is integrally injection molded on the aluminum rolled body, and an arched surface is provided on a side of the aluminum rolled body away from the plastic molded body, and the aluminum rolled body uses the centroid of the arched area as the arched point, so that the periphery of the aluminum rolled body is bent upward relative to the arched surface; the aluminum sheet and plastic composite mobile phone front shell also includes four reinforced vertical edges and four reinforced folded edges; the four reinforced vertical edges are arranged along the periphery of the aluminum rolled body, and each of the reinforced vertical edges is erected on the arched surface of the aluminum rolled body, and the four reinforced folded edges are aligned with the four reinforced vertical edges. A corresponding arrangement is provided, each of the reinforcing folded edges is connected to the side of the corresponding reinforcing vertical edge away from the arch bending surface, and each of the reinforcing folded edges is located on the side of the reinforcing vertical edge away from the aluminum rolling body, a plurality of first glue flow gong holes are provided at the connection between each of the reinforcing vertical edge and the aluminum rolling material, a plurality of second glue flow gong holes are provided at the connection between each of the reinforcing vertical edge and the corresponding reinforcing folded edge, the plurality of first glue flow gong holes and the plurality of second glue flow gong holes are arranged along the length direction of the reinforcing vertical edge, and each of the first glue flow gong holes and each of the second glue flow gong holes are staggered.

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