Aluminum sheet and plastic composite type mobile phone front shell and forming method and injection mold thereof

Abstract

The invention provides an aluminum sheet and plastic composite type mobile phone front shell and a forming method and an injection mold thereof. The forming method of the aluminum sheet and plastic composite type mobile phone front shell comprises the following steps that the gong processing information comprises a gong hole area and the number of gong holes, and the injection molding information comprises the plastic injection amount and a plastic distribution area; a high-precision numerical control machine tool is adopted for conducting hole milling treatment on the aluminum rolled material; setting an arching point according to the gong processing information, wherein the arching point is the centroid of a region defined by sequentially connecting the centroids of the gong hole regions; setting an arching surface of the aluminum rolled material according to the plastic distribution area; a numerical control hydraulic forming machine is adopted for conducting arching treatment on the aluminum rolled material, and the periphery of the aluminum rolled material is bent upwards relative to the arching face with the arching point as the center; and plastic is injected into the aluminum rolled material according to the plastic injection amount, wherein the plastic comprises polycarbonate and glass fibers. According to the aluminum sheet and plastic composite mobile phone front shell and the forming method thereof, the deformation of the mobile phone front shell can be effectively reduced, and the function or performance of a smart mobile phone can be further reduced.

Description

Technical Field

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

[0002] As people's living standards, material and cultural aspects improve, the requirements for the appearance, texture and feel of mobile phones are getting higher and higher. Smart phones are now developing in the direction of being thin and light, and at the same time, they are required to meet the strength requirements of bending and falling resistance. Most smart phone front shells will have in-mold injection-molded aluminum sheets as the skeleton of the entire smart phone's strength, which can ensure the structural strength of the smart phone and meet the requirements of thinness and lightness of the smart phone. However, the thickness of the aluminum sheet of the smart phone front shell is relatively small, and a window is opened on the aluminum sheet to optimize signal transmission and the installation of electronic devices. Combined with the uneven stress during injection molding of plastic on the aluminum sheet, especially the inconsistent distribution of plastic on the front shell of the mobile phone, the front shell of the mobile phone is prone to deformation, such as bending, twisting or partial warping, which is difficult to repair even with plastic surgery, thereby affecting the structural stability, screen display effect, waterproof and dustproof performance, appearance and other functions or performances of the smart phone. Summary of the invention

[0003] The purpose 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 and a molding method and an injection mold thereof that can effectively reduce the deformation of the mobile phone front shell and thereby reduce the impact on the function or performance of the smart phone.

[0004] The objective of the present invention is achieved through the following technical solutions: A method for forming an aluminum sheet and plastic composite mobile phone front shell comprises the following steps: 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; 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.

[0005] In one embodiment, the content of the glass fiber is 10% to 30%.

[0006] In one embodiment, the thickness of the aluminum rolled material is 0.25 mm to 0.8 mm.

[0007] In one embodiment, the arch height at the arch point is 0.5mm~2.0mm.

[0008] In one embodiment, the arch bending point is located on the line connecting the centroid of the area enclosed 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 enclosed by the centroids of each gong hole area is 0.01cm~0.15cm.

[0009] In one embodiment, after the step of obtaining the injection molding information of the aluminum rolled material and before the step of performing gong hole processing on the aluminum rolled material using a high-precision CNC machine tool, the molding method of the aluminum sheet and plastic composite mobile phone front shell further includes the following steps: 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 surface.

[0010] In one embodiment, 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 product, the corresponding segment of each reinforced vertical edge is arranged corresponding to the gong hole area; After the step of flanging the aluminum rolled material and before the step of using a high-precision CNC machine tool to perform a gong hole processing on the aluminum rolled material, the molding method of the aluminum sheet and plastic composite mobile phone front shell further includes the following steps: The gong hole positions of the aluminum rolled material are set according to the gong processing information, and the gong hole positions are linearly arranged along the length direction of each of the reinforced vertical edges. The distance between each two adjacent gong hole positions at the staggered section of each of the reinforced vertical edges is 0.8 cm to 1.0 cm, and the distance between each two adjacent gong hole positions at the corresponding section of each of the reinforced vertical edges is inversely proportional to the area of ​​the corresponding gong hole area. The distance between each two adjacent gong hole positions at the corresponding section of each of the reinforced vertical edges increases with the area of ​​the corresponding gong hole area for every 0.05 cm 2 Increase 0.03cm~0.08cm; A high-precision CNC machine tool is used to perform a first-level milling process on the aluminum rolled material to form a first-flow glue gong hole at the gong hole position.

[0011] In one embodiment, after the step of performing primary milling on the aluminum rolled material using a high-precision CNC machine tool and before the step of performing gong hole processing on the aluminum rolled material using a high-precision CNC machine tool, the molding method of the aluminum sheet and plastic composite mobile phone front shell further includes the following steps: A high-precision CNC machine tool is used to perform secondary gong milling on the aluminum rolled material to form a plurality of second glue flow gong holes in the area where the aluminum rolled material borders each of the reinforced vertical edges. The plurality of second glue flow gong holes are linearly and evenly arranged along the length direction of each of the reinforced vertical edges, and each of the second glue flow gong holes is staggered with each of the first glue flow gong holes.

[0012] In one embodiment, after the step of flanging the aluminum rolled material and before the step of setting the gong hole position of the aluminum rolled material according to the gong processing information, the molding method of the aluminum sheet and plastic composite mobile phone front shell further includes the following steps: Each of the reinforced vertical edges is folded so that each of the reinforced vertical edges is bent along a fold line to form a reinforced folded edge, the extension direction of each of the fold lines is the same as the length direction of the corresponding reinforced vertical edge, the reinforced folded edge of each of the reinforced vertical edges is set away from the aluminum rolled material, and the gong hole is set at the fold line.

[0013] In one embodiment, the height of the reinforced vertical edge is 0.5 mm to 1.5 mm.

[0014] An aluminum sheet and plastic composite mobile phone front shell is prepared by the molding method of the aluminum sheet and plastic composite mobile phone front shell described in any of the above embodiments; 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 a bending 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 bending area as the bending point so that the periphery of the aluminum rolled body bends upward relative to the bending surface.

[0015] In one embodiment, the aluminum sheet and plastic composite mobile phone front shell further includes four reinforced vertical edges and four reinforced folded edges; The four reinforcing vertical edges are arranged along the periphery of the aluminum rolling body, and each of the reinforcing vertical edges is erected on the arch surface of the aluminum rolling body, the four reinforcing folded edges are arranged one by one with the four reinforcing vertical edges, each of the reinforcing folded edges is connected to the side of the corresponding reinforcing vertical edge away from the arch 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 edges and the aluminum rolled material, a plurality of second glue flow gong holes are provided at the connection between each of the reinforcing vertical edges and the corresponding reinforcing folded edges, 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 edges, and each of the first glue flow gong holes and each of the second glue flow gong holes are staggered.

[0016] An injection mold, used for 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, and obtain the aluminum sheet and plastic composite mobile phone front shell as described in any of the above embodiments; The injection mold comprises a movable mold and a fixed mold, the movable mold can move towards or away from the fixed mold, and a curved support surface is provided on a side surface of the fixed mold close to the movable mold; An injection molding cavity is formed when the fixed mold and the movable mold are closed, the arch support surface is located in the injection molding cavity, the injection molding cavity is used to accommodate the aluminum rolled body, the arch support surface is used to abut against the side of the aluminum rolled profile away from the arch surface, and the injection molding cavity is used to inject plastic and integrally mold a plastic molded body on the aluminum rolled body.

[0017] 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 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 and the arch bending surface are respectively set 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 aluminum rolled material is processed by a CNC hydraulic forming machine. A bending treatment is performed, that is, the aluminum rolled material in the front shell of the mobile phone is pre-deformed, the bending surface and the bending point are set as pre-deformation parameters, and a CNC hydraulic forming machine is used to apply force with the bending point as the center position with high precision, and obtain aluminum rolled material with a high degree of bending, 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. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] 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.

[0019] 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; 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; 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; Figure 4 for Figure 3 A cross-sectional view of the aluminum sheet and plastic composite mobile phone front shell shown; Figure 5 for Figure 2 Another partial view of the front shell of the mobile phone of the composite type of aluminum sheet and plastic shown; Figure 6 for Figure 5 A partial enlarged view of the aluminum sheet and plastic composite mobile phone front shell at A; Figure 7 for Figure 2 Another partial view of the aluminum sheet and plastic composite mobile phone front cover shown; Figure 8 It is a structural schematic diagram of an injection mold according to one embodiment of the present invention; Fig. 9 for Figure 8 A partial cross-sectional view of the injection mold shown. DETAILED DESCRIPTION

[0020] In order to facilitate the understanding of the present invention, the present invention will be described more fully below with reference to the relevant drawings. The preferred embodiments of the present invention are given 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, the purpose of providing these embodiments is to make the disclosure of the present invention more thoroughly understood.

[0021] It should be noted that when an element is referred to as being "fixed to" 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", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation method.

[0022] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which the present invention belongs. The terms used herein in the specification of the present invention 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.

[0023] The present application provides a molding method for a composite front shell of an aluminum sheet and a plastic mobile phone. The molding method for the composite front shell of an aluminum sheet and a plastic mobile phone comprises the following steps: obtaining injection molding information and gong processing information of an aluminum rolled material, wherein the gong processing information includes a gong hole area and the number of gong holes, and the injection molding information includes a plastic injection amount and a plastic distribution area; 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, the arch bending point is the centroid of an area surrounded by the centroids of each gong hole area connected in sequence; setting an arch bending surface of the aluminum rolled material according to the plastic distribution area, wherein the arch bending surface is set on a side surface of the aluminum rolled material away from the plastic distribution area; using a CNC hydraulic forming machine to perform arch bending processing on the aluminum rolled material, with the arch bending point as the center, the periphery of the aluminum rolled material is bent upward relative to the arch bending surface; injecting 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, wherein the plastic includes polycarbonate and glass fiber.

[0024] 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.

[0025] In order to better understand the molding method of the aluminum sheet and plastic composite mobile phone front shell of the present application, the molding method of the aluminum sheet and plastic composite mobile phone front shell of the present application is further explained as follows: See also Figure 1 A method for forming an aluminum sheet and plastic composite mobile phone front shell in one embodiment includes the following steps: S100, obtaining 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.

[0026] It can be understood that since aluminum rolled products are rolled aluminum alloy profiles with good structural strength, the use of aluminum rolled products for composite plastic molding to obtain a mobile phone front shell can preliminarily reduce the deformation of the mobile phone front shell obtained by composite plastic molding of aluminum rolled products; the gong processing information includes the gong hole area and the number of gong holes. The gong hole area is the window area opened by the aluminum rolled product for composite molding of the mobile phone front shell in order to optimize signal transmission and the installation of electronic devices. The gong hole area is scattered at multiple positions of the aluminum rolled product, and the area of ​​the gong hole area at each position is different or partially the same, and the number of gong holes is That is, the number of gong 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 used for composite molding of aluminum rolled material. 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 amount of plastic required to completely fill the plastic part area with plastic. Therefore, the gong processing information and the injection molding information are information determined through the design of the mobile phone front shell and before the processing of the mobile phone front shell is completed.

[0027] S200, uses high-precision CNC machine tools to perform gong hole processing on aluminum rolled products to form functional gong holes in aluminum rolled products.

[0028] 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.

[0029] 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.

[0030] 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.

[0031] 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.

[0032] 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.

[0033] 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.

[0034] 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.

[0035] 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.

[0036] 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.

[0037] 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.

[0038] 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.

[0039] 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.

[0040] 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.

[0041] In one embodiment, the content of glass fiber is 10% to 30%. Further, the content of glass fiber is 20%. It can be understood that when the content of glass fiber is 10% to 30%, the difference in thermal stress between aluminum rolled material and plastic is better reduced on the basis of better ensuring the mechanical strength of the front shell of the mobile phone, and thus the deformation of the front shell of the mobile phone obtained by molding aluminum rolled material and plastic is better reduced.

[0042] In one embodiment, the thickness of the aluminum rolled material is 0.25 mm to 0.8 mm. It can be understood that in order to better achieve the lightness and thinness of the mobile phone, the aluminum rolled material with a thickness of 0.25 mm to 0.8 mm is applied to the forming method of the aluminum sheet and plastic composite mobile phone front shell, which can effectively reduce the deformation of the mobile phone front shell.

[0043] In one embodiment, the height of the arch at the arch point is 0.5mm~2.0mm. It can be understood that for the aluminum rolled material with a thickness of 0.25mm~0.8mm, the molding method of the aluminum sheet and plastic composite mobile phone front shell, with the arch height at the arch point being 0.5mm~2.0mm, can further achieve effective reduction of deformation of the mobile phone front shell.

[0044] In one of the embodiments, the arch bending point is located on the line connecting the centroid of the area enclosed 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 enclosed by the centroids of each gong hole area is 0.01cm~0.15cm. It can be understood that the larger the area of ​​the gong hole area, the greater the impact on the structural strength of the aluminum rolled material. By connecting the centroid of the closed area with the centroid of the gong hole area with the largest area in a straight line, and using the point within the range of 0.01cm~0.15cm from the centroid of the closed area 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 of the aluminum rolled material in the front shell of the mobile phone during composite plastic molding can be further improved.

[0045] In one embodiment, after the step of obtaining the injection molding information of the aluminum rolled material and before the step of using a high-precision CNC machine tool to perform a gong hole treatment on the aluminum rolled material, the molding method of the aluminum sheet and plastic composite mobile phone front shell further includes the following steps: performing a flanging treatment 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 curved surface. Further, each reinforcing 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 reinforcing vertical edge is arranged corresponding to the gong hole area. It can be understood that in the length and width directions of the aluminum rolled material, the corresponding section of each reinforced vertical edge is arranged corresponding to the gong hole 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, and the frame lines of the grids occupied by the gong hole area extend along the length and width directions of the aluminum profile to each reinforced vertical edge. At this time, the reinforced vertical edge corresponding to the length cut by the frame line on each reinforced vertical edge is the corresponding section, and the remaining reinforced vertical edges are staggered sections; the setting of the reinforced vertical edges further improves the structural strength of the aluminum rolled material, thereby further reducing the deformation of the aluminum rolled material.

[0046] In one embodiment, after the step of flanging the aluminum rolled material and before the step of using a high-precision CNC machine tool to perform a gong hole processing on the aluminum rolled material, the method for forming the aluminum sheet and plastic composite mobile phone front shell further includes the following steps: The gong hole positions of the aluminum rolled material are set according to the gong processing information. The gong hole positions are arranged linearly along the length direction of each reinforced vertical edge. The distance between each two adjacent gong hole positions at the offset section of each reinforced vertical edge is 0.8cm~1.0cm. The distance between each two adjacent gong hole positions 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 two adjacent gong hole positions at the corresponding section of each reinforced vertical edge increases with the area of ​​the corresponding gong hole area for every 0.05cm 2 Increase by 0.03cm~0.08cm.

[0047] It can be understood that the positions where the functional gong holes exist on the aluminum rolled material are particularly prone to deformation, which causes the front shell of the mobile phone to bend, twist and partially warp when the aluminum rolled material is composited with plastic to form the front shell of the mobile phone. It is difficult to set reinforced vertical edges to make the structural strength of the aluminum rolled material completely offset the influence of the stress of the plastic. Due to the presence of the functional gong holes in the aluminum rolled material, the front shell of the mobile phone obtained by composite molding of the aluminum rolled material with plastic is prone to bend, twist and partially warp, which is difficult to repair even through plastic treatment. Furthermore, the arching points and arching surfaces are designed to perform arching treatment on the aluminum rolled material, so as to improve the uniformity of the stress on the aluminum rolled material when the aluminum rolled material is composited with plastic. Since the degree of arching of the aluminum rolled material is limited, otherwise the aluminum rolled material in the front shell of the mobile phone will not be able to return to flatness when the aluminum rolled material is composited with plastic to form the front shell of the mobile phone. The wholeness, 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 needs to be further improved, so as to better ensure that the front shell of the mobile phone can be better repaired under the plastic treatment. In the present application, in order to further improve the bending, torsion and local warping of the front shell of the mobile phone, the gong hole positions of the aluminum rolled material are set according to the gong processing information, and the gong hole positions are linearly arranged along the length direction of each reinforced vertical edge, and the distance between each two adjacent gong hole positions at the staggered section of each reinforced vertical edge is 0.8cm~1.0cm, and the distance between each two adjacent gong hole positions at the corresponding section of each reinforced vertical edge is inversely proportional to the area of ​​the corresponding gong hole area, and the distance between each two adjacent gong hole positions at the corresponding section of each reinforced vertical edge increases with the area of ​​the corresponding gong hole area for every 0.05cm 2 Increase by 0.03cm~0.08cm, that is, by reducing the number of gong holes on the corresponding section of the reinforced vertical edge, specifically, the distance between each adjacent gong hole position at the corresponding section of each reinforced vertical edge is inversely proportional to the area of ​​the corresponding gong hole area, and the distance between each adjacent gong hole position at the corresponding section of each reinforced vertical edge increases with the area of ​​the corresponding gong hole area for every 0.05cm 2 By increasing the thickness by 0.03cm~0.08cm, the uniformity of stress on the aluminum-rolled composite plastic during molding is further improved, thereby further reducing the deformation of the mobile phone front shell obtained by the aluminum-rolled composite plastic molding, that is, further reducing the bending, torsion and local warping of the mobile phone front shell, so that the deformation of the mobile phone front shell can be better repaired through plastic treatment, thereby reducing the impact on the function or performance of the smart phone.

[0048] Furthermore, a high-precision CNC machine tool is used to perform a first-level milling process on the aluminum rolled material to form a first-flow glue gong hole at the gong hole position.

[0049] It can be understood that the use of high-precision CNC machine tools to perform primary milling treatment on aluminum rolled products can better ensure the milling accuracy of the first-stream glue holes, and thus better ensure the reduction of bending, torsion and local warping of the front shell of the mobile phone, so that the deformation of the front shell of the mobile phone can be better repaired through plastic treatment, thereby reducing the impact on the function or performance of the smartphone.

[0050] The above-mentioned design of the reinforced vertical edge and the gong hole position makes the distance between each adjacent gong hole position at the offset section of each reinforced vertical edge be 0.8cm~1.0cm, and the distance between each adjacent gong hole position 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 gong hole position at the corresponding section of each reinforced vertical edge increases with the area of ​​the corresponding gong hole area for every 0.05cm 2 The increase of 0.03cm~0.08cm further improves the uniformity of stress applied during aluminum-rolled composite plastic molding, thereby further reducing the deformation of the mobile phone front shell obtained by aluminum-rolled composite plastic molding, that is, further reducing the bending, torsion and local warping of the mobile phone front shell, so that the deformation of the mobile phone front shell can be better repaired through plastic treatment, thereby reducing the impact on the function or performance of the smart phone.

[0051] In one embodiment, after the step of performing primary milling on the aluminum rolled material by using a high-precision CNC machine tool, and before the step of performing gong hole processing on the aluminum rolled material by using a high-precision CNC machine tool, the forming method of the aluminum sheet and plastic composite mobile phone front shell also includes the following steps: performing secondary milling on the aluminum rolled material by using a high-precision CNC machine tool to form a plurality of second-flow glue gong holes in the area where the aluminum rolled material borders each reinforced vertical edge, the plurality of second-flow glue gong holes are linearly and evenly arranged along the length direction of each reinforced vertical edge, and each second-flow glue gong hole is staggered with each first-flow glue gong hole. It can be understood that the area where the aluminum rolled material borders each reinforced vertical edge is the flanging line of the aluminum rolled material, that is, the connection between the aluminum rolled material and the reinforced vertical edge. The use of a high-precision CNC machine tool to perform gong hole to form a second-flow glue gong hole is conducive to improving the tightness of the aluminum rolled material and the plastic during the composite plastic molding, and ensures the stable offset of the pre-deformation of the aluminum rolled material by the plastic.

[0052] In one embodiment, after the step of flanging the aluminum rolled material and before the step of setting the gong hole position of the aluminum rolled material according to the gong processing information, the forming method of the aluminum sheet and plastic composite mobile phone front shell also includes the following steps: folding each reinforced vertical edge so that each reinforced vertical edge is bent along a fold line to form a reinforced folded edge, the extension direction of each fold line is the same as the length direction of the corresponding reinforced vertical edge, the reinforced folded edge of each reinforced vertical edge is set away from the aluminum rolled material, and the gong hole position is set at the fold line. It can be understood that further folding the reinforced vertical edge further strengthens the structural strength of the aluminum rolled material, and promotes the gong hole position to be set at the folded edge, which reduces the impact of the first flow glue hole on the structural strength of the aluminum rolled material after it is formed, and further reduces the deformation of the mobile phone front shell obtained by the aluminum rolled material composite plastic molding, thereby reducing the impact on the function or performance of the smart phone.

[0053] In one embodiment, the height of the reinforced vertical edge is 0.5 mm to 1.5 mm, so as to effectively improve the structural strength of the aluminum rolled material while reducing the impact on the size of the front shell of the mobile phone.

[0054] The present application also provides an aluminum sheet and plastic composite mobile phone front shell, which is prepared by the molding method of the aluminum sheet and plastic composite mobile phone front shell of any of the above embodiments. In order to better understand the aluminum sheet and plastic composite mobile phone front shell of the present application, the aluminum sheet and plastic composite mobile phone front shell of the present application is further explained as follows: See also Figures 2 to 4 The aluminum sheet and plastic composite mobile phone front shell 10 of one embodiment includes an aluminum rolled body 110 and a plastic molded body 120. The aluminum rolled body 110 is provided with a plurality of functional gong holes 101, and the centroids of the plurality of functional gong holes 101 are sequentially connected to form an arched area 102. The plastic molded body 120 is integrally injection molded on the aluminum rolled body 110, and a side of the aluminum rolled body 110 away from the plastic molded body 120 is provided with an arched surface 103, and the aluminum rolled body 110 uses the centroid of the arched area 102 as an arched point 104, so that the periphery of the aluminum rolled body 110 is bent upward relative to the arched surface 103.

[0055] The above-mentioned aluminum sheet and plastic composite mobile phone front shell 10 has a plurality of functional gong holes 101 on the aluminum rolled body 110, which realizes the optimization of transmission signal and effective installation of electronic devices, and the centroids of the plurality of functional gong holes 101 are connected in sequence to form an arched area 102, and the aluminum rolled body 110 uses the centroid of the arched area 102 as the arched point 104, so that the periphery of the aluminum rolled body 110 is bent upward relative to the arched surface 103, that is, force is applied with the arched point 104 as the center position, so that the periphery of the aluminum rolled material is bent toward one side of the arched surface 103, that is, the periphery of the aluminum rolled material is bent upward relative to the arched surface 103, which 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 when composite-molded plastic is uniform, thereby reducing the deformation of the aluminum rolled material, or the deformation of the mobile phone front shell can be better repaired under plastic shaping, thereby improving the yield rate of the mobile phone front shell.

[0056] Please also read Figures 5 to 7 In one embodiment, the aluminum sheet and plastic composite mobile phone front shell 10 further includes four reinforced vertical edges 130 and four reinforced folded edges 140 . Furthermore, four reinforcing edges 130 are arranged along the periphery of the aluminum rolling body 110, and each reinforcing edge 130 is erected on the arched surface 103 of the aluminum rolling body 110, four reinforcing folded edges 140 are arranged one by one with the four reinforcing edges 130, each reinforcing folded edge 140 is connected to the side of the corresponding reinforcing edge 130 away from the arched surface 103, and each reinforcing folded edge 140 is located on the side of the reinforcing edge 130 away from the aluminum rolling body 110, a plurality of first flow glue gong holes 105 are provided at the connection between each reinforcing edge 130 and the aluminum rolled material, a plurality of second flow glue gong holes 106 are provided at the connection between each reinforcing edge 130 and the corresponding reinforcing folded edge 140, the plurality of first flow glue gong holes 105 and the plurality of second flow glue gong holes 106 are arranged along the length direction of the reinforcing edges 130, and each first flow glue gong hole 105 and each second flow glue gong hole 106 are staggered, thereby further improving the structural strength of the aluminum rolled material.

[0057] In one embodiment, the arch bending point is located on the line connecting the centroid of the area enclosed by the centroids of each functional gong hole and the centroid of the functional gong hole with the largest aperture, and the distance between the arch bending point and the centroid of the area enclosed by the centroids of each functional gong hole is 0.01cm~0.15cm.

[0058] Please also read Figures 5 to 7In one embodiment, each reinforced vertical edge 130 includes at least one corresponding segment 131 and at least one offset segment 132 connected to each other. In the length and width direction of the aluminum rolling body 110, the corresponding segment 131 of each reinforced vertical edge 130 is arranged corresponding to the functional gong hole 101. Further, the distance between each adjacent two first flow glue gong holes 105 at the corresponding segment 131 of each reinforced vertical edge 130 increases with the opening area of ​​the corresponding functional gong hole 101 for every 0.05 cm 2 Increase by 0.03cm~0.08cm.

[0059] The present application also provides an injection mold, which is used to inject plastic into the aluminum rolled material according to the plastic injection amount, so as to form plastic in the plastic distribution area of ​​the aluminum rolled material, and obtain the aluminum sheet and plastic composite mobile phone front shell 10 of any of the above embodiments. In order to better understand the injection mold of the present application, the injection mold of the present application is further explained as follows: Please also read Figures 8 to 9 The injection mold 20 of one embodiment includes a movable mold 210 and a fixed mold 220. The movable mold 210 can move toward or away from the fixed mold 220, and a curved support surface 201 is provided on a side surface of the fixed mold 220 close to the movable mold 210. When the fixed mold 220 and the movable mold 210 are molded together, an injection molding cavity 202 is formed, and the curved support surface 201 is located in the injection molding cavity 202. The injection molding cavity 202 is used to accommodate the aluminum rolling body, and the curved support surface 201 is used to abut against the side of the aluminum rolling profile away from the curved surface, and the injection molding cavity 202 is used to inject plastic and integrally form a plastic molding body on the aluminum rolling body.

[0060] The above-mentioned injection mold 20 enables the injection molding cavity 202 to accommodate the aluminum rolled body, the arch support surface 201 to abut against the side of the aluminum rolled profile away from the arch surface, and the injection molding cavity 202 to inject plastic and integrally mold a plastic molded body on the aluminum rolled body, thereby better realizing the effective molding preparation of the aluminum sheet and plastic composite mobile phone front shell.

[0061] The front shell of the mobile phone is processed by an injection mold, and the aluminum rolled material is placed in the injection molding cavity. The arch support surface is used to abut against the side of the aluminum rolled profile away from the arch surface. At this time, when the aluminum rolled material meets any of the above parameters, the front shell of the mobile phone obtained by demolding is subjected to plastic processing, and the yield rate is greater than 99.99%.

[0062] Compared with the prior art, the present invention has at least the following advantages: 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, the arch bending surface 103 and the arch bending point 104 are set as pre-deformation parameters, and a CNC hydraulic forming machine is used to apply force with the arch bending point 104 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 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.

[0063] The above 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 those of ordinary skill in the art, 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 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; 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: After the step of obtaining the injection molding information of the aluminum rolled material and before the step of performing gong hole processing on the aluminum rolled material using a high-precision CNC machine tool, the molding method of the aluminum sheet and plastic composite mobile phone front shell further includes the following steps: 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 surface.

5. The method for forming the aluminum sheet and plastic composite mobile phone front shell according to claim 4, 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; After the step of flanging the aluminum rolled material and before the step of using a high-precision CNC machine tool to perform a gong hole processing on the aluminum rolled material, the molding method of the aluminum sheet and plastic composite mobile phone front shell further includes the following steps: The gong hole positions of the aluminum rolled material are set according to the gong processing information, and the gong hole positions are linearly arranged along the length direction of each of the reinforced vertical edges. The distance between each two adjacent gong hole positions at the staggered section of each of the reinforced vertical edges is 0.8 cm to 1.0 cm, and the distance between each two adjacent gong hole positions at the corresponding section of each of the reinforced vertical edges is inversely proportional to the area of ​​the corresponding gong hole area. The distance between each two adjacent gong hole positions at the corresponding section of each of the reinforced vertical edges increases with the area of ​​the corresponding gong hole area for every 0.05 cm 2 Increase 0.03cm~0.08cm; A high-precision CNC machine tool is used to perform a first-level milling process on the aluminum rolled material to form a first-flow glue gong hole at the gong hole position.

6. The method for forming the aluminum sheet and plastic composite mobile phone front shell according to claim 5, characterized in that: After the step of performing primary milling on the aluminum rolled material using a high-precision CNC machine tool and before the step of performing gong hole processing on the aluminum rolled material using a high-precision CNC machine tool, the molding method of the aluminum sheet and plastic composite mobile phone front shell further includes the following steps: A high-precision CNC machine tool is used to perform secondary gong milling on the aluminum rolled material to form a plurality of second glue flow gong holes in the area where the aluminum rolled material borders each of the reinforced vertical edges. The plurality of second glue flow gong holes are linearly and evenly arranged along the length direction of each of the reinforced vertical edges, and each of the second glue flow gong holes is staggered with each of the first glue flow gong holes.

7. The method for forming a composite mobile phone front shell of aluminum sheet and plastic according to claim 5, characterized in that: After the step of flanging the aluminum rolled material and before the step of setting the gong hole position of the aluminum rolled material according to the gong processing information, the molding method of the aluminum sheet and plastic composite mobile phone front shell further includes the following steps: Each of the reinforcing vertical edges is subjected to a folding process so that each of the reinforcing vertical edges is bent along a fold line to form a reinforcing folded edge, the extension direction of each of the fold lines is the same as the length direction of the corresponding reinforcing vertical edge, the reinforcing folded edge of each of the reinforcing vertical edges is arranged away from the aluminum rolled material, and the gong hole is arranged at the fold line; and / or, The height of the reinforced vertical edge is 0.5mm~1.5mm.

8. 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 6; 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 a bending 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 bending area as the bending point so that the periphery of the aluminum rolled body bends upward relative to the bending surface.

9. The aluminum sheet and plastic composite mobile phone front shell according to claim 8, characterized in that: The aluminum sheet and plastic composite mobile phone front shell also includes four reinforced vertical edges and four reinforced folded edges; The four reinforcing vertical edges are arranged along the periphery of the aluminum rolling body, and each of the reinforcing vertical edges is erected on the arch surface of the aluminum rolling body, the four reinforcing folded edges are arranged one by one with the four reinforcing vertical edges, each of the reinforcing folded edges is connected to the side of the corresponding reinforcing vertical edge away from the arch 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 edges and the aluminum rolled material, a plurality of second glue flow gong holes are provided at the connection between each of the reinforcing vertical edges and the corresponding reinforcing folded edges, 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 edges, and each of the first glue flow gong holes and each of the second glue flow gong holes are staggered.

10. An injection mold, characterized in that: Used to inject 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, thereby obtaining the aluminum sheet and plastic composite mobile phone front shell as claimed in claim 8 or 9; The injection mold comprises a movable mold and a fixed mold, the movable mold can move towards or away from the fixed mold, and a curved support surface is provided on a side surface of the fixed mold close to the movable mold; An injection molding cavity is formed when the fixed mold and the movable mold are closed, the arch support surface is located in the injection molding cavity, the injection molding cavity is used to accommodate the aluminum rolled body, the arch support surface is used to abut against the side of the aluminum rolled profile away from the arch surface, and the injection molding cavity is used to inject plastic and integrally mold a plastic molded body on the aluminum rolled body.

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