Forming connection equipment and forming connection structure of imitation metal mobile phone backboard plastic and manufacturing method of forming connection equipment and forming connection structure

Abstract

The invention provides a molding connection device, a molding connection structure and a manufacturing method of metal-imitating mobile phone backboard plastic, the molding connection device of the metal-imitating mobile phone backboard plastic comprises a plurality of inserts, an upper mold core and a lower mold core, the inserts are sequentially spliced in the circumferential direction of the lower mold core, and a cavity is formed by the inserts, the lower mold core and the upper mold core; a buckle forming groove and a shell groove which are communicated with each other are formed in the cavity; the lower mold core is provided with a compensation glue groove which is communicated with the buckle forming groove and is used for reducing plastic shrinkage deformation; the upper mold core is provided with a first annular inclined groove used for forming a highlight parting inclined face, and the lower mold core is provided with a second annular inclined groove used for forming the highlight parting inclined face. A compensation glue layer is formed in the compensation glue groove to reduce the height difference generated on the surface between the aluminum sheet and the mobile phone backboard plastic shell, and highlight parting inclined planes which generate brightness difference with the adjacent parting surfaces are formed in the first annular inclined groove and the second annular inclined groove, so that the highlight edge effect of the highlight parting inclined planes is better.

Description

Technical Field

[0001] The present invention relates to the technical field of mobile phone back panel manufacturing, and in particular to a molding connection device, a molding connection structure and a manufacturing method thereof for a metal-like mobile phone back panel plastic. Background Art

[0002] The design of modern smartphones is developing towards a refined and high-end metal appearance. However, the manufacturing process of metal shells is complicated and the cost is high. In order to reduce the cost and obtain the texture of the metal shell, the plastic shell is made by injection molding, and the plastic shell is sprayed with electroplated metal paint, and then the aluminum sheet is composited and connected with the plastic shell to obtain a lightweight imitation metal mobile phone back panel.

[0003] The plastic shell is formed with a snap connection part connected to the aluminum sheet. The snap connection part is relatively thick. During the cooling and molding process of the injection-molded plastic shell, the thicker part shrinks more during the cooling process, which makes the plastic shell easily deformed. The surface of the plastic shell is not flat with the surface of the installed aluminum sheet, resulting in a height difference between the surface of the aluminum sheet and the surface of the plastic shell. When the injection-molded plastic shell is cut through EDM processing to obtain a parting surface with edges, a natural R angle will be generated due to ablation cutting, so that the highlight edge of the plastic shell cut cannot achieve the metal highlight edge effect, thereby affecting the imitation metal effect of the plastic of the mobile phone back panel.

[0004] For example, the reference document CN201620086845.1 discloses a new type of metal mobile phone back cover, including a body, the body having a back plate, an upper back frame and a lower back frame, the back plate is an aluminum back plate; the upper back frame and the lower back frame are both plastic frames, the upper back frame is integrally formed with an upper bonding plate that fits the upper inner surface of the back plate, the lower back frame is integrally formed with a lower bonding plate that fits the lower inner surface of the back plate, the upper bonding plate and the back plate are glued together, and the lower bonding plate and the back plate are glued together. However, this solution cannot solve the height difference between the aluminum sheet and the surface of the plastic shell after injection molding and shrinkage, and its upper back frame and the lower back frame do not have the effect of imitating metal and the effect of highlighting the edge.

[0005] Another example is the colorful effect of a mobile phone back panel disclosed in the comparative document CN202111512321.6, which includes the following steps: selecting a composite board; spraying colorful ink to form a spray layer; placing it in an electrolyte solution for electroplating to form an electroplating layer on the spray layer; printing a layer of transparent ink on the electroplating layer; and coating the other side of the composite board with a strengthening layer. This solution forms an electroplating layer by electroplating the spray layer, which can keep the spray layer metallic luster and obtain a better aurora colorful effect. However, this solution fails to solve the problem that after the aluminum sheet and the plastic shell are compositely connected, they shrink during the injection molding process, resulting in a height difference between the surface of the aluminum sheet and the plastic shell. At the same time, the back panel of the mobile phone cannot achieve the effect of a metallic highlight edge. Summary of the invention

[0006] The purpose of the present invention is to overcome the shortcomings of the prior art and to provide a molding connection device, a molding connection structure and a manufacturing method thereof for connecting aluminum sheets and plastics, reducing the height difference between the surfaces of the aluminum sheets and the plastic shells and achieving a better imitation metal highlight edge effect for imitating metal mobile phone back panel plastics.

[0007] The purpose of this disclosure is achieved through the following technical solutions: A molding and connecting device for plastic of a metal-like mobile phone back panel, comprising an insert, an upper mold core and a lower mold core, wherein the lower mold core is provided with a plurality of mounting grooves in the circumference thereof, the number of the inserts is multiple, each of the inserts is installed in the corresponding mounting groove, the multiple inserts are sequentially spliced ​​along the circumference of the lower mold core, the multiple inserts and the lower mold core jointly form a cavity, the upper mold core is covered in the cavity, an injection molding flow channel is provided in the upper mold core, a connected buckle molding groove and a shell groove are formed in the cavity, the shell groove is used to mold the main body of the plastic shell of the mobile phone back panel, the buckle molding groove is used to mold a buckle connection part connected to an aluminum sheet, the injection molding flow channel is connected to the shell groove, the lower mold core is provided with a compensating rubber groove connected to the buckle molding groove, and the compensating rubber groove is used to reduce the deformation caused by plastic shrinkage; The upper mold core is provided with a first annular bevel groove connected to the mold cavity along the circumference of the mold cavity, and the lower mold core is provided with a second annular bevel groove connected to the mold cavity along the circumference of the mold cavity. The first annular bevel groove and the second annular bevel groove are used to form two highlighted parting slopes on the upper and lower edges of the plastic shell of the back panel of the mobile phone.

[0008] In one embodiment, the insert includes an integrally formed raised portion and a movable portion, the raised portion of each insert abuts in sequence along the circumference of the cavity, the raised portion of each insert is adjacent to the cavity, each movable portion is installed in the installation groove, and the movable portion is also provided with a protruding limit block, and a plurality of limit grooves are opened in the circumference of the lower mold core, and each limit block is embedded in the corresponding limit groove.

[0009] In one of the embodiments, an assembly groove for demoulding is formed at one end of the movable portion away from the protruding portion.

[0010] In one embodiment, a first guide slope is provided on a side of the protruding portion adjacent to the upper die core, and a first abutting portion is convexly provided on the upper die core, and the first abutting portion is attached to the first guide slope; and / or, A second guide slope is arranged on one side of the protruding portion adjacent to the lower die core, and a second abutting portion is convexly arranged on the lower die core, and the second abutting portion is attached to the second guide slope.

[0011] In one of the embodiments, the thickness difference between the buckle molding groove and the shell groove is 0.2mm-0.7mm, and the groove depth of the compensation glue groove is 0.001mm-0.005mm.

[0012] In one embodiment, a first heating channel is provided in the upper mold core, a second heating channel is provided in the insert, and a third heating channel is provided in the lower mold core. The first heating channel, the second heating channel and the third heating channel are respectively used to connect to corresponding heating devices so that the temperature range of the insert is 100℃-120℃, the temperature range of the upper mold core is 70℃-85℃, and the temperature range of the lower mold core is 70℃-85℃.

[0013] In one embodiment, the molding and connection equipment of the imitation metal mobile phone back panel plastic also includes a plurality of inclined ejectors, the upper mold core is provided with an ejection channel, the ejection channels are arranged at intervals along the circumference of the cavity, each of the inclined ejectors is installed on the corresponding ejection channel, and the ejection channel is inclined toward the center of the cavity.

[0014] In one of the embodiments, the compensating rubber groove is an arc transition curved surface structure.

[0015] A forming and connecting structure of an imitation metal mobile phone back panel plastic, comprising a mobile phone back panel plastic shell and an aluminum sheet obtained by injection molding using the forming and connecting equipment of the imitation metal mobile phone back panel plastic described in any of the above embodiments, wherein the upper and lower edges of the mobile phone back panel plastic shell are respectively formed with parting slopes, a receiving groove is provided in the mobile phone back panel plastic shell, the aluminum sheet is installed in the receiving groove, the aluminum sheet is convexly provided with a snap protrusion, a snap connection part is provided on one side of the mobile phone back panel plastic shell, the snap connection part is provided with a snap groove, the snap protrusion is installed in the snap groove, and a compensation adhesive layer is provided on the surface of the snap connection part, and the compensation adhesive layer is flush with the surface of the aluminum sheet.

[0016] A method for manufacturing a molding connection structure of a plastic imitation metal mobile phone back panel, which is manufactured by the molding connection device of the plastic imitation metal mobile phone back panel in any of the above embodiments. The plurality of inserts are sequentially mounted on the lower mold core, and the upper mold core is covered on the mold cavity for mold closing; The insert, the upper mold core and the lower mold core are heated by a heating device so that the temperature range of the insert is 100° C.-120° C., the temperature range of the upper mold core is 70° C.-85° C., and the temperature range of the lower mold core is 70° C.-85° C.; Passing the injection material into the injection molding runner for injection molding; The cavity is cooled, and after the mold is opened, a mobile phone back panel plastic shell with two highlighted parting slopes formed on the upper and lower edges is obtained; The parting surfaces on the surface of the mobile phone back plate plastic shell are sprayed with paint and electroplated, so that the upper and lower edges of the mobile phone back plate plastic shell form high-brightness parting slopes with high-brightness edge effects, thereby obtaining a mobile phone back plate plastic shell with a metallic texture; The aluminum sheet is connected to the plastic shell of the mobile phone back panel to obtain a molded connection structure of the imitation metal mobile phone back panel plastic.

[0017] Compared with the prior art, the present invention has at least the following advantages: The above-mentioned molding and connection equipment for the imitation metal mobile phone back panel plastic, after multiple inserts are spliced ​​together, form a cavity with the upper mold core and the lower mold core, and the upper mold core, the lower mold core and multiple inserts are separately precision-processed, so that the mobile phone back panel plastic shell obtains more parting surface effects; the thickness of the snap connection part of the mobile phone back panel plastic shell is relatively thick, and the snap connection part shrinks internally after cooling to produce a thickness difference with the surface of the aluminum sheet. The compensation glue layer formed in the compensation glue groove remains flat with the surface of the aluminum sheet after molding, reducing the height difference between the aluminum sheet and the surface of the mobile phone back panel plastic shell; The plastic shell of the back panel of the machine is formed with two inclined parting bevels in the first annular bevel groove and the second annular bevel groove, so that the surface of the inclined parting bevel is smooth and the boundary between the parting bevel and the adjacent parting surface is obvious; the parting bevel formed by the plastic shell of the back panel of the mobile phone is easy to produce parallax relative to the plane, making the incident light more easily reflected, thereby covering up the tiny defects produced by the parting bevel during the injection molding process, and then making it easier for the inclined parting bevel and the plane of the adjacent parting surface to produce brightness difference, and the highlight edge formed by the parting bevel of the plastic shell of the back panel of the mobile phone has a better effect.

[0018] The method for manufacturing a molded connection structure of an imitation metal mobile phone back panel plastic comprises the following steps: precision injection molding a mobile phone back panel plastic shell, painting and electroplating each parting surface of the mobile phone back panel plastic shell, so that the upper and lower edges of the mobile phone back panel plastic shell form parting slopes with highlighted edges, and then the mobile phone back panel plastic shell is compositely connected with an aluminum sheet, so that the obtained molded connection structure of the imitation metal mobile phone back panel plastic has the effects of lightweight structure, high strength, and highlighted edge metal texture. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present disclosure 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 paying creative work.

[0020] Figure 1 This is a structural schematic diagram of a molding and connecting device for a plastic imitation metal mobile phone back panel according to an embodiment; Figure 2for Figure 1 An exploded view of the molded connection device of the plastic imitating the metal mobile phone back panel is shown; Figure 3 for Figure 1 A schematic diagram of the partial structure of the molding connection device of the imitation metal mobile phone back panel plastic shown; Figure 4 for Figure 1 A cross-sectional view of a molded connection device for a plastic imitation metal mobile phone back panel is shown; Figure 5 for Figure 4 A partial enlarged view of the molding connection device of the imitation metal mobile phone back panel plastic at A shown; Figure 6 for Figure 1 The structural schematic diagram of the upper mold core shown; Figure 7 for Figure 1 The structural schematic diagram of the lower mold core shown; Figure 8 This is a structural schematic diagram of a molded connection structure of a plastic imitation metal mobile phone back panel according to an embodiment; Fig. 9 for Figure 8 Another structural schematic diagram of the molding connection structure of the imitation metal mobile phone back panel plastic shown; Fig.10 for Figure 8 Another structural schematic diagram of the molding connection structure of the imitation metal mobile phone back panel plastic shown; Fig.11 The present invention is a flowchart of the steps of a method for manufacturing a molded connection structure of a plastic imitation metal mobile phone back panel according to an embodiment. DETAILED DESCRIPTION

[0021] In order to facilitate the understanding of the present disclosure, the present disclosure will be described more fully below with reference to the relevant drawings. The preferred embodiments of the present disclosure are given in the drawings. However, the present disclosure 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 disclosure more thoroughly and comprehensively understood.

[0022] 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.

[0023] 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 disclosure belongs. The terms used herein in the specification of the present disclosure are only for the purpose of describing specific embodiments and are not intended to limit the present disclosure. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0024] In order to better understand the technical solutions and beneficial effects of the present invention, the present invention is further described in detail below in conjunction with specific embodiments: See also Figures 1 to 5 , which is a molding connection device 10 for imitating metal mobile phone back panel plastic according to an embodiment of the present invention, comprising an insert 100, an upper mold core 200 and a lower mold core 300, wherein the lower mold core 300 is provided with a plurality of mounting grooves 301 in the circumferential direction, wherein the number of the inserts 100 is multiple, and each of the inserts 100 is installed in a corresponding mounting groove 301, wherein the multiple inserts 100 are sequentially spliced ​​along the circumferential direction of the lower mold core 300, wherein the multiple inserts 100 and the lower mold core 300 jointly form a cavity 101, wherein the upper mold core 200 is covered in the cavity 101, and the upper mold core 200 An injection molding flow channel 201 is provided inside, and the injection molding flow channel 201 is connected to the mold cavity 101; a connected buckle molding groove 102 and a shell groove 103 are formed in the mold cavity 101, and the shell groove 103 is used to mold the main body of the mobile phone back plate plastic shell 20, and the buckle molding groove 102 is used to mold the buckle connection part 20a connected to the aluminum sheet 30, and the injection molding flow channel 201 is connected to the shell groove 103, and the lower mold core 300 is provided with a compensation rubber groove 302 connected to the buckle molding groove 102, and the compensation rubber groove 302 is used to reduce the deformation of plastic shrinkage; The upper mold core 200 is provided with a first annular bevel groove 202 along the circumferential edge of the cavity 101, and the lower mold core 300 is provided with a second annular bevel groove 303 along the circumferential edge of the cavity 101. The first annular bevel groove 202 is connected to the cavity 101, and the first annular bevel groove 202 and the second annular bevel groove 303 are used to form two highlighted parting slopes 211a on the upper and lower edges of the mobile phone back panel plastic shell 20.

[0025] In the present embodiment, a plurality of inserts 100 are spliced ​​together to form a cavity 101 with an upper mold core 200 and a lower mold core 300, and a mobile phone back panel plastic shell 20 is injection molded in the cavity 101, and the mobile phone back panel plastic shell 20 is used to connect with the aluminum sheet 30 to form a molded connection structure of the mobile phone back panel imitation metal mobile phone back panel plastic; when the mobile phone back panel plastic shell 20 is demoulded during the injection molding process, the lower mold core 300, a plurality of inserts 100 and the lower mold core 300 are separated in turn to demould the mobile phone back panel plastic shell 20, and when the mobile phone back panel plastic shell 20 is demoulded, the lower mold core 300, a plurality of inserts 100 and the lower mold core 300 can be separated in turn to peel off, thereby reducing the peeling strength between the mobile phone back panel plastic shell 20 and the mold, thereby reducing the deformation of the mobile phone back panel plastic shell 20; it can be understood that the snap connection portion 20a of the mobile phone back panel plastic shell 20 is thicker, and the snap connection portion 20a is thicker. After cooling, the connecting portion 20a shrinks internally, resulting in a thickness difference between the snap connecting portion 20a and the surface of the aluminum sheet 30. After the compensating glue layer formed in the compensating glue groove 302 shrinks, the surface of the mobile phone back panel plastic shell 20 and the aluminum sheet 30 remain flat; the plastic is formed into an inclined highlight parting bevel 211a in the first annular bevel 202, which prevents the natural R angle caused by direct ablation, making the surface of the inclined highlight parting bevel 211a smoother, and the incident angle of the incident light on the inclined highlight parting bevel 211a is different from that of the plane, which is more likely to meet the condition of mirror reflection. The inclined highlight parting bevel 211a is prone to parallax relative to the plane, making the incident light more easily reflected, thereby covering up the tiny defects of the highlight parting bevel 211a produced during the injection molding process, making it easier for the inclined highlight parting bevel 211a and the side plane to produce a brightness difference.

[0026] The above-mentioned imitation metal mobile phone back panel plastic molding and connection device 10, after multiple inserts 100 are spliced, they form a cavity 101 with the upper mold core 200 and the lower mold core 300, and the upper mold core 200 and the lower mold core 300 and multiple inserts 100 are separately precision-processed, so that the mobile phone back panel plastic shell 20 obtains more parting surface effects; the thickness of the snap connection part 20a of the mobile phone back panel plastic shell 20 is relatively thick, and the snap connection part 20a shrinks internally after cooling to produce a thickness difference with the surface of the aluminum sheet 30, and the compensation glue layer formed in the compensation glue groove 302 is kept flat with the surface of the aluminum sheet 30 after molding, thereby reducing the height difference between the surface of the aluminum sheet 30 and the mobile phone back panel plastic shell 20; the mobile phone back panel plastic The shell 20 forms two inclined highlight parting bevels 211a in the first annular bevel groove 202 and the second annular bevel groove 303, so that the surface of the inclined highlight parting bevel 211a is smooth, and the boundary between the highlight parting bevel 211a and the adjacent parting surface is obvious; the highlight parting bevel 211a formed on the plastic shell 20 of the mobile phone back panel is easy to produce parallax relative to the plane, making the incident light more easily reflected, thereby covering up the tiny defects of the highlight parting bevel 211a produced during the injection molding process, and then making it easier for the inclined highlight parting bevel 211a and the plane of the adjacent parting surface to produce brightness difference, and the highlight edge formed by the highlight parting bevel 211a of the plastic shell 20 of the mobile phone back panel has a better effect.

[0027] It is understandable that the thickness of the plastic shell 20 of the mobile phone back panel is relatively thin, and the precision and compatibility requirements of the molding and connecting equipment 10 of the imitation metal mobile phone back panel plastic are relatively high. It is necessary to precisely process the molding and connecting equipment 10 of the imitation metal mobile phone back panel plastic, and splice and match multiple inserts 100, upper mold core 200 and lower mold core 300 to make the cooperation between the various components in the molding and connecting equipment 10 of the imitation metal mobile phone back panel plastic tight and accurate, so that the mobile phone back panel plastic shell 20 obtains more parting surface effects; the first annular bevel 202 and the second annular bevel 303 need to form a highlighted parting bevel 211a with a highlighted edge, and the first annular bevel 202 and the second annular bevel 303 need to be highly polished to make the surface of the highlighted parting bevel 211a formed by the plastic shell 20 of the mobile phone back panel smooth.

[0028] like Figure 2As shown, in one embodiment, the insert 100 includes an integrally formed protruding portion 110 and a movable portion 120, each protruding portion 110 of the insert 100 abuts against the cavity 101 in sequence along the circumference, each protruding portion 110 of the insert 100 is adjacent to the cavity 101, each movable portion 120 is installed in the installation groove 301, and the movable portion 120 is also protrudingly provided with a limit block 121, and a plurality of limit grooves 304 are opened in the circumference of the lower mold core 300, and each limit block 121 is embedded in the corresponding limit groove 304. In this embodiment, the raised portion 110 of each of the inserts 100 abuts in sequence along the circumference of the cavity 101, so that the inserts 100 can fit tightly together to form a continuous structure surrounding the cavity 101, and the movable portion 120 is installed in the installation groove 301, and the limit block 121 limits the position of the movable portion 120 installed on the lower mold core 300, so that the position of the insert 100 installed on the lower mold core 300 is accurate, which facilitates the disassembly and replacement of the insert 100 and makes the insert 100, the upper mold core 200 and the lower mold core 300 fit more tightly.

[0029] like Figure 2 As shown, in one embodiment, an assembly groove 1201 for demoulding is provided at one end of the movable portion 120 away from the protruding portion 110. In this embodiment, after the mobile phone back panel plastic shell 20 in the cavity 101 is cooled and solidified, the protruding portion 110 adheres to the mobile phone back panel plastic shell 20 in the cavity 101 due to the adhesion between the plastic and the surface of the protruding portion 110, and the protruding portion 110 can be separated from the upper mold core 200 by pulling the assembly groove 1201.

[0030] like Figure 4As shown, in one embodiment, a first guide bevel 1101 is provided on a side of the raised portion 110 adjacent to the upper mold core 200, and a first abutting portion 210 is convexly provided on the upper mold core 200, and the first abutting portion 210 is affixed to the first guide bevel 1101; a second guide bevel 1102 is provided on a side of the raised portion 110 adjacent to the lower mold core 300, and a second abutting portion 310 is convexly provided on the lower mold core 300, and the second abutting portion 310 is affixed to the second guide bevel 1102. In this embodiment, the first guide bevel 1101 cooperates with the first abutment portion 210, and the second guide bevel 1102 cooperates with the second abutment portion 310, so that the upper mold core 200, the lower mold core 300 and the insert 100 are accurately aligned and positioned during the injection molding process, reducing the deviation and deformation of the mobile phone back panel plastic shell 20 in the injection molding cavity 101; after the mobile phone back panel plastic shell 20 in the cavity 101 is cooled and solidified, the first abutment portion 210 and the second abutment portion 310 can slide along their respective first guide bevels 1101 and second guide bevels 1102, so that the protrusion 110 is smoothly separated from the mobile phone back panel plastic shell 20 in the cavity 101, and the first guide bevel 1101 and the second guide bevel 1102 also reduce the wear between the insert 100 and the upper mold core 200 and the lower mold core 300, thereby extending the service life of the molding and connection device 10 of the imitation metal mobile phone back panel plastic.

[0031] like Figure 4 , Figure 7 and Figure 8As shown, in one embodiment, a first heating channel 203 is provided in the upper mold core 200, a second heating channel 104 is provided in the insert 100, and a third heating channel 305 is provided in the lower mold core 300. The first heating channel, the second heating channel and the third heating channel are respectively used to connect to corresponding heating devices, so that the temperature range of the insert is 100℃-120℃, the temperature range of the upper mold core is 70℃-85℃, and the temperature range of the lower mold core is 70℃-85℃. In this embodiment, the upper mold core 200, the lower mold core 300 and the insert 100 can be heated separately through the second heating channel 104, the third heating channel 305 and the first heating channel 203, so that the temperature control of different positions in the cavity 101 is more accurate, and the heating temperature can be flexibly adjusted according to the needs of different parts, so that differentiated temperature settings are allowed in the cavity 101, and the thickness difference of different parts of the shell is coped with and the cooling rate is optimized; the temperature of the molten injection plastic is relatively high, the first annular chute 202 of the upper mold core 200 and the second annular chute 303 of the lower mold core 300 are in contact with the molten injection plastic, and the temperature difference between the molten injection plastic and the insert 100 is relatively The temperature difference between the molten injection plastic and the upper mold core 200 and the lower mold core 300 is relatively large, so that the injection plastic is quickly cooled to below the glass transition temperature Tg of PC polycarbonate within 0.2s-0.5s, and the surface molecular chains of the inclined high-gloss parting slope 211a of the injection plastic are frozen, reducing the movement and rearrangement of the molecular chains during the cooling process, thereby making the high-gloss parting slope 211a of the injection plastic molded have higher gloss; cooling gas or cooling liquid can also be introduced through the second heating channel 104, the third heating channel 305 and the first heating channel 203, so that the mobile phone back panel plastic shell 20 in the cavity 101 is quickly solidified and formed, thereby accelerating the injection molding production process.

[0032] like Figures 5 to 7As shown, further, the upper mold core 200 includes an upper mold core 220 and an upper mold frame 230, the upper mold frame 230 is penetrated with a first installation channel 2301, the upper mold core 220 is installed in the first installation channel 2301, the first heating channel 203 is arranged in the upper mold frame 230 along the circumference of the first installation channel 2301, the upper mold core 220 is used to contact the inner wall of the upper part of the mobile phone back plate plastic shell 20, the first annular inclined groove 202 is formed between the upper mold core 220 and the upper mold frame 230, and the upper mold frame 230 is used to contact the outer wall of the highlight parting slope 211a on the upper part of the mobile phone back plate plastic shell 20 touch; and / or, the lower mold core 300 includes a lower mold core 320 and a lower mold frame 330, the lower mold frame 330 has a second installation channel 3301 passing through, the lower mold core 320 is installed in the second installation channel 3301, the third heating channel 305 is arranged in the lower mold frame 330 along the circumference of the second installation channel 3301, the lower mold core 320 is used to contact the inner wall of the lower part of the mobile phone back panel plastic shell 20, the lower mold core 320 forms the second annular bevel 303 between the lower mold frame 330, and the lower mold frame 330 is used to contact the outer wall of the highlighted parting slope 211a of the lower part of the mobile phone back panel plastic shell 20. In this embodiment, the upper mold core 220 and the lower mold core 320 are made of high thermal conductivity materials such as beryllium copper alloy or tungsten copper alloy to ensure rapid heat transfer. The upper mold frame 230 surrounds the upper mold core 220, and the lower mold frame 330 surrounds the lower mold core 320, so that the temperature of the upper mold core 220 and the lower mold core 320 is heated more evenly and stably, and the contact area between the upper mold core 220 and the lower mold core 320 and the mobile phone back panel plastic shell 20 in the cavity 101 is larger, so that the shrinkage of the mobile phone back panel plastic shell 20 is smaller.

[0033] It can be understood that a first annular bevel 202 is formed between the upper mold core 220 and the upper mold frame 230, and the upper mold frame 230 is used to contact the outer wall of the highlight parting bevel 211a on the upper part of the mobile phone back panel plastic shell 20, so as to form the highlight parting bevel 211a of the mobile phone back panel plastic shell 20 in the first annular bevel 202, and the temperature difference between the upper mold frame 230 and the injection molded material is controlled by the first heating channel 203, so that a smoother highlight parting bevel of the mobile phone back panel plastic shell 20 is formed after the injection molded material contacts the upper mold frame 230. 211a; a second annular bevel groove 303 is formed between the lower mold core 320 and the lower mold frame 330, and the lower mold frame 330 is used to contact the outer wall of the highlight parting bevel 211a at the lower part of the mobile phone back panel plastic shell 20, thereby forming the highlight parting bevel 211a of the mobile phone back panel plastic shell 20 in the second annular bevel groove 303, and the temperature difference between the lower mold frame 330 and the injection molding material is controlled by the third heating channel 305, so that a smoother highlight parting bevel 211a of the mobile phone back panel plastic shell 20 is formed after the injection molding material contacts the lower mold frame 330.

[0034] In one embodiment, the thickness difference between the buckle molding groove 102 and the shell groove 103 is 0.2 mm-0.7 mm, and the groove depth of the compensation glue groove 302 is 0.001 mm-0.005 mm. In this embodiment, after the plastic material is injection molded, it is taken out of the cavity 101 and cooled to room temperature. The snap molding groove 102 in the cavity 101 is a thicker part of the shell, and the snap connection part 20a formed by the snap molding groove 102 shrinks during the injection molding process; specifically, when the injection molding material is PC polycarbonate, the thickness of the snap molding groove 102 is 1mm-1.3mm, and the thickness of the shell groove 103 is 0.6mm-0.8mm. The shrinkage rate of PC polycarbonate after molding is about 0.5%~0.7%, so that the snap connection part 20a shrinks by 0.001mm-0.005mm, and the compensation glue groove 302 compensates for the height difference between the snap connection part 20a and the aluminum sheet 30, so that the surface of the plastic shell 20 of the back panel of the mobile phone and the combined aluminum sheet 30 maintain a smooth transition effect.

[0035] like Figure 1 and Figure 4 As shown, in one embodiment, the molding and connecting device 10 of the imitation metal mobile phone back panel plastic further includes a plurality of inclined ejectors 400, the upper mold core 200 is provided with an ejection channel 204, the ejection channel 204 is arranged at intervals along the circumference of the cavity 101, each of the inclined ejectors 400 is installed in the corresponding ejection channel 204, and the ejection channel 204 is inclined toward the center of the cavity 101. In this embodiment, the inclined ejectors 400 slide in the ejection channel 204, thereby driving the mobile phone back panel plastic shell 20 to separate from the upper mold core 200, and the ejection channel 204 is inclined toward the center of the cavity 101, so that during the ejection process, the demoulding force can be more evenly distributed on the mobile phone back panel plastic shell 20, reducing the risk of deformation or damage due to excessive local force, avoiding the situation that the molding and connecting device 10 of the imitation metal mobile phone back panel plastic is stuck during the production process, thereby improving production efficiency.

[0036] like Figure 3 As shown, in one embodiment, the compensation rubber groove 302 is a circular arc transition curved surface structure. In this embodiment, the transition surface between the compensation rubber layer and the surface of the mobile phone back panel plastic shell 20 is smooth, so that the surface of the mobile phone back panel plastic shell 20 has a smooth transition; the inside of the compensation rubber groove 302 is a smooth curved surface, which reduces the stress concentration of the lower mold core 300, improves the fatigue strength of the lower mold core 300, and reduces the stress concentration caused by the flow of the injection plastic, cooling shrinkage, etc., and improves the fatigue strength of the compensation rubber layer.

[0037] In one embodiment, the upper mold core 200 is provided with a positioning protrusion, and the lower mold core 300 is provided with a positioning groove, and the positioning protrusion is embedded in the positioning groove. In this embodiment, when the upper mold core 200 and the lower mold core 300 are closed, the positioning protrusion of the upper mold core 200 will be accurately embedded in the positioning groove of the lower mold core 300, thereby ensuring that the relative position between the upper mold core 200 and the lower mold core 300 is accurate. Through the cooperation of the positioning protrusion and the positioning groove, the closing operation of the upper mold core 200 and the lower mold core 300 is facilitated, and the accuracy of the molding connection device 10 of the imitation metal mobile phone back panel plastic when closing is improved.

[0038] like Figures 8 to 10 As shown, the present application also provides a molding connection structure of an imitation metal mobile phone back panel plastic, the molding connection structure of the imitation metal mobile phone back panel plastic includes a mobile phone back panel plastic shell 20 and an aluminum sheet 30 obtained by injection molding the molding connection device 10 of the imitation metal mobile phone back panel plastic described in any of the above embodiments, the upper and lower edges of the mobile phone back panel plastic shell 20 are respectively formed with a highlighted parting slope 211a, a receiving groove 201a is provided in the mobile phone back panel plastic shell 20, the aluminum sheet 30 is installed in the receiving groove 201a, the aluminum sheet 30 is convexly provided with a snap protrusion 30a, a snap connection part 20a is provided on one side of the mobile phone back panel plastic shell 20, the snap connection part 20a is provided with a snap groove 201a, the snap protrusion 30a is installed in the snap groove 201a, and the surface of the snap connection part 20a is provided with a compensation glue layer 212a, and the compensation glue layer 212a is flush with the surface of the aluminum sheet 30.

[0039] like Fig.11 As shown, the present application also provides a method for manufacturing a molded connection structure of a plastic imitation metal mobile phone back panel, wherein the molded connection structure of the plastic imitation metal mobile phone back panel is manufactured by the molded connection device 10 of the plastic imitation metal mobile phone back panel described in any of the above embodiments. S101: multiple inserts 100 are sequentially mounted on the lower mold core 300, and the upper mold core 200 is covered on the mold cavity 101 for mold closing; S103 preheats the insert 100, the upper mold core 200 and the lower mold core 300 so that the temperature range of the insert is 100° C.-120° C., the temperature range of the upper mold core is 70° C.-85° C., and the temperature range of the lower mold core is 70° C.-85° C.; S105: passing the injection material into the injection molding runner 201 for injection molding; S107 cools the mold cavity 101, and after the mold is opened, a mobile phone back panel plastic shell 20 with two highlighted parting slopes 211a formed on the upper and lower edges is obtained; S109: spraying and electroplating each parting surface on the surface of the mobile phone back plate plastic shell 20, so that the upper and lower edges of the mobile phone back plate plastic shell 20 form a highlight parting slope 211a with a highlight edge effect, and obtain a mobile phone back plate plastic shell 20 with a metallic texture; S111 compositely connects the aluminum sheet 30 and the metal texture mobile phone back plate plastic shell 20 to obtain a plastic molded connection structure.

[0040] In the present embodiment, a mobile phone back panel plastic shell 20 with multiple parting surfaces is obtained by injection molding, and at the same time, two highlight parting bevels 211a are formed on the upper and lower edges of the mobile phone back panel plastic shell 20. The surface of the highlight parting bevel 211a is flat and has obvious boundaries with adjacent parting surfaces, so that the highlight parting bevel 211a has a significant brightness difference with the adjacent parting surfaces after painting and electroplating, so that the metal texture of the mobile phone back panel plastic shell 20 is obvious; when the aluminum sheet 30 is compositely connected with the metal texture mobile phone back panel plastic shell 20, the aluminum sheet and the mobile phone back panel plastic shell 20 are snapped together by the snap protrusion 30a, and the aluminum sheet and the mobile phone back panel plastic shell 20 are bonded or hot-melt connected, thereby obtaining a lightweight plastic molding connection structure; it can be understood that the temperature of the molten injection plastic is relatively high, the first annular bevel 202 of the upper mold core 200 and the second annular bevel 303 of the lower mold core 300 are in contact with the molten injection plastic, and the temperature difference between the molten injection plastic and the insert 100 is relatively The temperature difference between the molten injection plastic and the upper mold core 200 and the lower mold core 300 is large, so that the injection plastic is quickly cooled to below the glass transition temperature Tg of PC polycarbonate within 0.2s-0.5s, and the surface molecular chains of the inclined high-gloss parting slope 211a of the injection plastic are frozen, reducing the movement and rearrangement of the molecular chains during the cooling process, thereby making the high-gloss parting slope 211a of the injection plastic molded have higher gloss; it can be understood that the temperature difference between the lower mold core 300 and the molten injection plastic is large, which is beneficial to the gloss of the high-gloss parting slope 211a molded in the second annular bevel 303, but when the temperature difference between the lower mold core 300 and the molten injection plastic is large, the shrinkage rate of the snap connection part 20a formed by the snap molding groove 102 of the cavity 101 is large, and the compensation glue layer 212a formed by the compensation glue groove 302 supplements the shrinkage space of the snap connection part 20a, so that the surface of the plastic shell 20 of the back panel of the mobile phone remains flat.

[0041] The manufacturing method of the above-mentioned imitation metal mobile phone back panel plastic molding connection structure, through the coordination of multiple processes, sequentially performs precision injection molding of the mobile phone back panel plastic shell 20, and sprays paint and electroplates each parting surface of the mobile phone back panel plastic shell 20, so that the upper and lower edges of the mobile phone back panel plastic shell 20 form a high-brightness parting slope 211a with a high-brightness edge, and then the mobile phone back panel plastic shell 20 is compositely connected with the aluminum sheet 30, so that the obtained imitation metal mobile phone back panel plastic molding connection structure has the effect of lightweight structure, high strength, and high-brightness metal texture.

[0042] Furthermore, the highlight parting bevel 211a of the mobile phone back panel plastic shell 20 needs to form a highlight edge effect, and the first annular bevel groove 202 and the second annular bevel groove 303 need to be highly polished. Before the plurality of inserts 100 are sequentially mounted on the lower mold core 300 and the upper mold core 200 is covered on the mold cavity 101 for mold closing, the following steps are also included: Polishing the first annular bevel groove 202 and the second annular bevel groove 303 once by a mechanical mirror polishing machine; Then use ultrasonic polishing machine for secondary polishing.

[0043] In this embodiment, when the mechanical mirror polishing machine performs the first polishing, most of the protrusions and depressions on the surfaces of the first annular bevel groove 202 and the second annular bevel groove 303 are removed, reducing the difficulty of polishing by the subsequent ultrasonic polishing machine; when the ultrasonic polishing machine performs the second polishing, the tiny flaws and scratches remaining on the first annular bevel groove 202 and the second annular bevel groove 303 after mechanical polishing are removed, further improving the smoothness and glossiness of the surfaces of the first annular bevel groove 202 and the second annular bevel groove 303, so that the inner molding surface of the first annular bevel groove 202 and the second annular bevel groove 303 has a smooth highlighted parting bevel 211a.

[0044] Furthermore, since the surface roughness of the first annular bevel groove 202 and the second annular bevel groove 303 is relatively low and is easily worn, it is necessary to protect the surface of the first annular bevel groove 202 and the second annular bevel groove 303. After the first annular bevel groove 202 and the second annular bevel groove 303 are high-polished, the following steps are also included: DLC diamond-like carbon is deposited on the surface of the first annular bevel 202 and the second annular bevel 303 to form a DLC coating. In this embodiment, the DLC coating on the surface of the first annular bevel 202 and the second annular bevel 303 has high hardness and good wear resistance, and can resist wear and scratches during use, thereby extending the service life of the first annular bevel 202 and the second annular bevel 303. The DLC coating can also significantly reduce the adhesion between the first annular bevel 202 and the second annular bevel 303 and the highlight parting bevel 211a, reduce the occurrence of mold sticking, and thus improve production efficiency and product quality.

[0045] In one of the embodiments, when the injection molding material is passed into the injection molding runner 201 for injection molding, the injection molding pressure is 80MPa-120MPa, the holding pressure after injection molding is 50MPa-90MPa, and the holding time of injection molding is 5s-10s. In this embodiment, the mobile phone back panel plastic shell 20 has a thin-walled structure, and the flow resistance of the molten injection molding material is large. When the injection molding pressure is less than 80MPa, the molten injection molding material fills the cavity 101 poorly, resulting in a lack of glue or shrinkage marks during molding; when the injection molding pressure is less than or greater than 120MPa, it may cause the molded mobile phone back panel plastic shell 20 to have increased flash and internal stress. The injection molding pressure that needs to be controlled for the mobile phone back panel plastic shell 20 is 80MPa-120MPa, so that the molten injection molding material fills the cavity 101, while avoiding excessive pressure. negative impact; when the cavity 101 is filled with the injection plastic, the holding pressure applied to the injection plastic is 50MPa-90MPa, so as to maintain the density of the injection plastic and reduce defects such as shrinkage; when the holding time is less than 5s, the holding process cannot fully compensate for the shrinkage of the injection plastic; when the holding time is greater than 10s, the holding time process may cause unnecessary internal stress in the injection plastic; the holding time of injection molding is 5s-10s, so that the mobile phone back panel plastic shell 20 can be fully compensated for shrinkage and shaped during the cooling process, avoiding the negative impact of too long holding time.

[0046] Furthermore, in one of the embodiments, the injection molding material is PC polycarbonate, and the temperature range of the injection molding material is 280°C-320°C. In this embodiment, PC polycarbonate has high tensile, compressive and bending strengths, and PC polycarbonate maintains stable performance in a wide temperature range and is not prone to thermal deformation. The insert 100, the upper mold core 200 and the lower mold core 300 are preheated to reduce the heat loss of PC polycarbonate during the injection molding process, thereby improving the flow properties of the injection molding material and reducing the risk of deformation and cracking of the molded mobile phone back panel plastic shell 20.

[0047] Furthermore, the temperature difference between the insert 100 and the upper mold core 200 and the lower mold core 300 is less than 20°C-30°C. In the present embodiment, when the temperature difference between the insert 100 and the upper mold core 200 and the lower mold core 300 is too large, the molten injection plastic will stagnate due to the inconsistent cooling speed when flowing through the area with a large temperature difference. The stagnation of the molten injection plastic will further cause flow marks, thereby affecting the appearance quality. Too large a temperature difference may also cause internal stress to be generated inside the product, thereby causing deformation or cracking during subsequent use. Too large a temperature difference may also cause the molten injection plastic to flow poorly when filling the cavity 101, thereby causing insufficient filling and other defects. By controlling the temperature difference between the insert 100 and the upper mold core 200 and the lower mold core 300, the stagnation of the molten injection plastic to generate flow marks is avoided, thereby improving the quality and production efficiency of the molded mobile phone back panel plastic shell 20.

[0048] In one embodiment, the mold cavity 101 is cooled, and the cooling time is 15s-25s. In this embodiment, when the cooling time of the mobile phone back panel plastic shell 20 is less than 15s, the heat inside the mobile phone back panel plastic shell 20 cannot be fully dissipated, and the mobile phone back panel plastic shell 20 continues to shrink due to the release of internal stress after demoulding, resulting in the instability and deviation of the size of the mobile phone back panel plastic shell 20; when the cooling time is too long, the injection molding process of the mobile phone back panel plastic shell 20 is long, thereby affecting the production efficiency; controlling the cooling time to 15s-25s ensures the quality and production efficiency of the mobile phone back panel plastic shell 20, and reduces energy consumption and production costs.

[0049] In one embodiment, each parting surface on the surface of the mobile phone back plate plastic shell 20 is sprayed with paint and electroplated so that the upper and lower edges of the mobile phone back plate plastic shell 20 form a highlight parting slope 211a with a highlight edge, and a mobile phone back plate plastic shell 20 with a metallic texture is obtained, comprising the following steps: Spraying primer on each parting surface of the mobile phone back panel plastic shell 20; Vacuum electroplating metal paint on the mobile phone back plate plastic shell 20 sprayed with the primer, so that each parting surface of the mobile phone back plate plastic shell 20 obtains a metal paint layer; Spraying colorless transparent middle-layer paint on the two highlight parting slopes 211a of the upper and lower edges of the mobile phone back plate plastic shell 20 to form a highlight parting slope 211a with a metallic texture, and spraying colored transparent middle-layer paint on the other parting surfaces of the mobile phone back plate plastic shell 20 to form a parting surface with a metallic texture; Spraying bright surface protective paint on the mobile phone back panel plastic shell 20; The mobile phone back panel plastic shell 20 will be laser engraved. In this embodiment, the base paint can enhance the adhesion between the metal paint and the plastic shell, fill the tiny defects on the surface of the plastic shell, provide a uniform and smooth base for the metal paint layer, and make the metal texture more uniform and delicate; the colored transparent middle layer paint has a transparent base, and specific pigments or dyes are added to the colored transparent middle layer paint to make it present a certain color effect. When the colored transparent middle layer paint is sprayed on the metal paint layer, the mobile phone back panel plastic shell 20 obtains the metal texture effect of other colors; the colorless transparent middle layer paint is transparent, and when the colorless transparent middle layer paint is sprayed on the metal paint layer of the high-gloss parting bevel 211a The bright surface protective paint can also improve the weather resistance of the mobile phone back panel plastic shell 20 and provide protection to prevent scratches, wear and other physical damage in daily use, thereby extending the service life of the mobile phone back panel plastic shell 20. The bright surface protective paint can increase the glossiness of the mobile phone back panel plastic shell 20 and further improve the metallic texture of the mobile phone back panel plastic shell 20. The mobile phone back panel plastic shell 20 is laser engraved, so that the laser engraved part of the mobile phone back panel plastic shell 20 forms a matte surface, thereby making the appearance texture and style of the mobile phone back panel plastic shell 20 more varied.

[0050] Furthermore, the aluminum sheet can be electroplated to make the aluminum sheet and the mobile phone back panel plastic shell 20 look similar. After the parting surfaces on the surface of the mobile phone back panel plastic shell 20 are sprayed and electroplated, the aluminum sheet is connected to the metal texture mobile phone back panel plastic shell 20 to obtain a plastic molding connection structure, and the following steps are also included: CNC cutting of the aluminum material to obtain an aluminum substrate sheet; Polishing the aluminum substrate sheet; The polished aluminum substrate sheet is electroplated with a metal layer and then subjected to a coloring treatment to obtain an aluminum sheet. In this embodiment, the required aluminum substrate sheet shape and size are accurately cut from the aluminum material by CNC machine tool cutting technology, thereby ensuring the accuracy and consistency of the aluminum sheet; the metal layer is electroplated on the polished aluminum substrate sheet, thereby increasing the metallic texture of the aluminum sheet and enhancing the corrosion resistance, hardness and wear resistance of the aluminum sheet; the coloring treatment enables the aluminum sheet to more accurately match the color and design of the mobile phone back panel plastic shell 20, thereby ensuring that the appearance style of the aluminum sheet and the mobile phone back panel plastic shell 20 remain consistent.

[0051] In one of the embodiments, the present application also provides a method for manufacturing a molded connection structure of a plastic imitation metal mobile phone back panel, which is manufactured by the molding connection equipment of the plastic imitation metal mobile phone back panel, wherein a plurality of the inserts are sequentially installed on the lower mold core, and the upper mold core is covered on the cavity for mold closing; the inserts, the upper mold core and the lower mold core are heated by a heating device to make the temperature range of the inserts 100°C-120°C, the temperature range of the upper mold core 70°C-85°C, and the temperature of the lower mold core The range is 70℃-85℃; the injection plastic is passed into the injection molding runner for injection molding; the cavity is cooled, and after the mold is opened, a mobile phone back panel plastic shell with two high-gloss parting slopes formed on the upper and lower edges is obtained; each parting surface on the surface of the mobile phone back panel plastic shell is sprayed with paint and electroplated to form high-gloss parting slopes with high-gloss edge effects on the upper and lower edges of the mobile phone back panel plastic shell, so as to obtain a mobile phone back panel plastic shell with a metallic texture; the aluminum sheet is connected to the mobile phone back panel plastic shell to obtain a molded connection structure of imitation metal mobile phone back panel plastic.

[0052] The molding and connecting equipment of the imitation metal mobile phone back panel plastic comprises an insert, an upper mold core and a lower mold core. The lower mold core is provided with a plurality of mounting grooves in the circumference thereof. The number of the inserts is multiple, and each of the inserts is installed in the corresponding mounting groove. The multiple inserts are sequentially spliced ​​along the circumference of the lower mold core. The multiple inserts and the lower mold core jointly form a cavity. The upper mold core is covered in the cavity. An injection molding flow channel is provided in the upper mold core. A connected buckle molding groove and a shell groove are formed in the cavity. The shell groove is used to mold the main body of the plastic shell of the mobile phone back panel. The buckle molding groove is used to mold the buckle connection part connected with the aluminum sheet. The injection molding flow channel is connected to the shell groove. The lower mold core is provided with a compensating rubber groove connected to the buckle molding groove. The compensating rubber groove is used to reduce the deformation caused by the shrinkage of the plastic. The upper mold core is provided with a first annular bevel groove connected to the mold cavity along the circumference of the mold cavity, and the lower mold core is provided with a second annular bevel groove connected to the mold cavity along the circumference of the mold cavity. The first annular bevel groove and the second annular bevel groove are used to form two highlighted parting slopes on the upper and lower edges of the plastic shell of the back panel of the mobile phone.

[0053] The insert includes an integrally formed raised portion and a movable portion. The raised portion of each of the inserts is abutted in sequence along the circumference of the cavity. The raised portion of each of the inserts is adjacent to the cavity. Each of the movable portions is installed in the installation groove. The movable portion is also provided with a stop block. The lower die core is provided with a plurality of stop grooves in the circumference. Each of the stop blocks is embedded in the corresponding stop groove. An assembly groove for demoulding is provided at one end of the movable portion away from the raised portion. A first guide bevel is provided on the side of the raised portion adjacent to the upper die core. The upper die core is provided with a first abutting portion, and the first abutting portion is attached to the first guide bevel; and / or a second guide bevel is provided on the side of the raised portion adjacent to the lower die core. The lower die core is provided with a second abutting portion, and the second abutting portion is attached to the second guide bevel. The thickness difference between the buckle molding groove and the housing groove is 0.2mm-0.7mm, and the groove depth of the compensation rubber groove is 0.001mm-0.005mm. The upper mold core is provided with a first heating channel, the insert is provided with a second heating channel, and the lower mold core is provided with a third heating channel. The first heating channel, the second heating channel and the third heating channel are respectively used to connect to the corresponding heating equipment, so that the temperature range of the insert is 100℃-120℃, the temperature range of the upper mold core is 70℃-85℃, and the temperature range of the lower mold core is 70℃-85℃. The molding connection equipment of the imitation metal mobile phone back panel plastic also includes a plurality of inclined ejectors, the upper mold core is provided with an ejection channel, and the ejection channels are arranged at intervals along the circumference of the cavity, each of the inclined ejectors is installed on the corresponding ejection channel, and the ejection channel is inclined toward the center of the cavity. The compensating rubber groove is a circular arc transition surface structure.

[0054] The molding connection structure of the imitation metal mobile phone back panel plastic comprises a mobile phone back panel plastic shell and an aluminum sheet obtained by injection molding using the molding connection equipment for the imitation metal mobile phone back panel plastic, wherein the upper and lower edges of the mobile phone back panel plastic shell are respectively formed with parting slopes, a receiving groove is provided in the mobile phone back panel plastic shell, the aluminum sheet is installed in the receiving groove, a snap protrusion is convexly provided on the aluminum sheet, a snap connection part is provided on one side of the mobile phone back panel plastic shell, a snap connection part is provided in the snap connection part, the snap protrusion is installed in the snap connection groove, a compensation adhesive layer is provided on the surface of the snap connection part, and the compensation adhesive layer is flush with the surface of the aluminum sheet.

[0055] Compared with the prior art, the present invention has at least the following advantages: The above-mentioned imitation metal mobile phone back panel plastic molding and connection device 10, after multiple inserts 100 are spliced, they form a cavity 101 with the upper mold core 200 and the lower mold core 300, and the upper mold core 200 and the lower mold core 300 and multiple inserts 100 are separately precision-processed, so that the mobile phone back panel plastic shell 20 obtains more parting surface effects; the thickness of the snap connection part 20a of the mobile phone back panel plastic shell 20 is relatively thick, and the snap connection part 20a shrinks internally after cooling to produce a thickness difference with the surface of the aluminum sheet 30, and the compensation glue layer formed in the compensation glue groove 302 is kept flat with the surface of the aluminum sheet 30 after molding, thereby reducing the height difference between the surface of the aluminum sheet 30 and the mobile phone back panel plastic shell 20; the mobile phone back panel plastic The shell 20 forms two inclined highlight parting bevels 211a in the first annular bevel groove 202 and the second annular bevel groove 303, so that the surface of the inclined highlight parting bevel 211a is smooth, and the boundary between the highlight parting bevel 211a and the adjacent parting surface is obvious; the highlight parting bevel 211a formed on the plastic shell 20 of the mobile phone back panel is easy to produce parallax relative to the plane, making the incident light more easily reflected, thereby covering up the tiny defects of the highlight parting bevel 211a produced during the injection molding process, and then making it easier for the inclined highlight parting bevel 211a and the plane of the adjacent parting surface to produce brightness difference, and the highlight edge formed by the highlight parting bevel 211a of the plastic shell 20 of the mobile phone back panel has a better effect.

[0056] The method for manufacturing a molded connection structure of an imitation metal mobile phone back panel plastic is to coordinate multiple processes, sequentially perform precision injection molding of a mobile phone back panel plastic shell 20, spray paint and electroplate each parting surface of the mobile phone back panel plastic shell 20, so that the upper and lower edges of the mobile phone back panel plastic shell 20 form a high-gloss parting slope 211a with a high-gloss edge, and then compositely connect the mobile phone back panel plastic shell 20 with an aluminum sheet 30, so that the obtained molded connection structure of the imitation metal mobile phone back panel plastic has the effect of lightweight structure, high strength, and high-gloss metal texture.

[0057] The above-mentioned embodiments only express several implementation methods of the present disclosure, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the disclosed patent. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present disclosure, and these all belong to the protection scope of the present disclosure. Therefore, the protection scope of the disclosed patent shall be subject to the attached claims.

Claims

1. A molding and connecting device for imitating metal mobile phone back panel plastic, characterized in that: It comprises an insert, an upper mold core and a lower mold core, wherein the lower mold core is provided with a plurality of mounting grooves in the circumference thereof, the number of the inserts is plural, each of the inserts is installed in the corresponding mounting groove, the plurality of inserts are sequentially spliced ​​along the circumference of the lower mold core, the plurality of inserts and the lower mold core jointly form a cavity, the upper mold core is covered in the cavity, an injection molding flow channel is provided in the upper mold core, a connected buckle molding groove and a shell groove are formed in the cavity, the shell groove is used to mold the main body of the plastic shell of the back plate of the mobile phone, the buckle molding groove is used to mold the buckle connection part connected with the aluminum sheet, the injection molding flow channel is connected to the shell groove, the lower mold core is provided with a compensating rubber groove connected to the buckle molding groove, and the compensating rubber groove is used to reduce the deformation caused by the shrinkage of the plastic; The upper mold core is provided with a first annular bevel groove connected to the mold cavity along the circumference of the mold cavity, and the lower mold core is provided with a second annular bevel groove connected to the mold cavity along the circumference of the mold cavity. The first annular bevel groove and the second annular bevel groove are used to form two highlighted parting slopes on the upper and lower edges of the plastic shell of the back panel of the mobile phone.

2. The molding and connecting device of the imitation metal mobile phone back panel plastic according to claim 1, characterized in that: The insert includes an integrally formed protrusion and a movable portion, the protrusion of each insert abuts in sequence along the circumference of the cavity, the protrusion of each insert is adjacent to the cavity, each movable portion is installed in the installation groove, and the movable portion is also protruding with a limit block, and a plurality of limit grooves are opened in the circumference of the lower mold core, and each limit block is embedded in the corresponding limit groove.

3. The molding and connecting device of the imitation metal mobile phone back panel plastic according to claim 2, characterized in that: An assembly groove for demoulding is formed at one end of the movable part away from the protruding part.

4. The molding and connecting device for imitating metal mobile phone back panel plastic according to claim 2, characterized in that: A first guide slope is disposed on one side of the protruding portion adjacent to the upper die core, and a first abutting portion is convexly disposed on the upper die core, and the first abutting portion is attached to the first guide slope; and / or, A second guide slope is arranged on one side of the protruding portion adjacent to the lower die core, and a second abutting portion is convexly arranged on the lower die core, and the second abutting portion is attached to the second guide slope.

5. The molding and connecting device of the imitation metal mobile phone back panel plastic according to claim 1, characterized in that: The thickness difference between the buckle forming groove and the shell groove is 0.2mm-0.7mm, and the groove depth of the compensation glue groove is 0.001mm-0.005mm.

6. The molding and connecting device for imitating metal mobile phone back panel plastic according to claim 1, characterized in that: A first heating channel is provided in the upper mold core, a second heating channel is provided in the insert, and a third heating channel is provided in the lower mold core. The first heating channel, the second heating channel and the third heating channel are respectively used to be connected to corresponding heating devices so that the temperature range of the insert is 100°C-120°C, the temperature range of the upper mold core is 70°C-85°C, and the temperature range of the lower mold core is 70°C-85°C.

7. The molding and connecting device for imitating metal mobile phone back panel plastic according to claim 6, characterized in that: The molding and connection equipment for the imitation metal mobile phone back panel plastic also includes a plurality of inclined ejectors, the upper mold core is provided with an ejection channel, the ejection channels are arranged at intervals along the circumference of the cavity, each of the inclined ejectors is installed on the corresponding ejection channel, and the ejection channel is arranged inclined toward the center of the cavity.

8. The molding and connecting device for imitating metal mobile phone back panel plastic according to claim 1, characterized in that: The compensating rubber groove is an arc transition curved surface structure.

9. A molding connection structure of a plastic imitation metal mobile phone back panel, characterized in that: A mobile phone back panel plastic shell and an aluminum sheet obtained by injection molding using a molding and connecting device for imitation metal mobile phone back panel plastic according to any one of claims 1 to 8, wherein the upper and lower edges of the mobile phone back panel plastic shell are respectively formed with highlighted parting slopes, a receiving groove is provided in the mobile phone back panel plastic shell, the aluminum sheet is installed in the receiving groove, the aluminum sheet is convexly provided with a snap protrusion, a snap connection part is provided on one side of the mobile phone back panel plastic shell, the snap connection part is provided with a snap groove, the snap protrusion is installed in the snap groove, and a compensation adhesive layer is provided on the surface of the snap connection part, and the compensation adhesive layer is flush with the surface of the aluminum sheet.

10. A method for manufacturing a molded connection structure of a plastic imitation metal mobile phone back panel, which is manufactured by the molded connection device of the plastic imitation metal mobile phone back panel according to any one of claims 1 to 8, characterized in that: The plurality of inserts are sequentially mounted on the lower mold core, and the upper mold core is covered on the mold cavity for mold closing; The insert, the upper mold core and the lower mold core are heated by a heating device so that the temperature range of the insert is 100° C.-120° C., the temperature range of the upper mold core is 70° C.-85° C., and the temperature range of the lower mold core is 70° C.-85° C.; Passing the injection material into the injection molding runner for injection molding; The cavity is cooled, and after the mold is opened, a mobile phone back panel plastic shell with two highlighted parting slopes formed on the upper and lower edges is obtained; The parting surfaces on the surface of the mobile phone back plate plastic shell are sprayed with paint and electroplated, so that the upper and lower edges of the mobile phone back plate plastic shell form high-brightness parting slopes with high-brightness edge effects, thereby obtaining a mobile phone back plate plastic shell with a metallic texture; The aluminum sheet is connected to the plastic shell of the mobile phone back panel to obtain a molded connection structure of the imitation metal mobile phone back panel plastic.

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