Automatic layering injection molding device and application method

Abstract

The invention relates to an automatic layering injection molding device and an application method, the automatic layering injection molding device comprises an upper mold and a lower mold, and further comprises a separation layer, and a fixing ring for clamping and fixing the separation layer is arranged between the upper mold and the lower mold; glue inlet channels are arranged on the inner walls of the upper injection molding cavity and the lower injection molding cavity; an induction heating coil for heating the metal braid layer is embedded in the fixing ring, the fixing ring is formed by enclosing a plurality of arc-shaped sections, a coil section is embedded in each arc-shaped section, and the plurality of coil sections are combined to form the induction heating coil; the device further comprises a moving unit for driving the plurality of arc-shaped sections to move, a power supply unit for supplying power to the induction heating coil and a hydraulic punch for driving the upper die to move longitudinally; the two molded layers can be synchronously formed through injection molding, the two molded layers are combined through hot pressing by means of the hot melt adhesive, the combination reliability is good, and meanwhile the combination thickness controllability is good.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of layered injection molding, more particularly to an automatic layered injection molding device and application method. BACKGROUND

[0002] Layered injection molding is a processing method of injecting materials in batches, which is suitable for products with multiple colors or thick-walled / complex structure manufacturing; in actual application, after the injection of the first layer of plastic, the next layer of plastic will affect the already formed plastic of the previous layer due to its own heat impact, causing deformation and displacement; in order to solve this defect, Chinese patent application No. CN201810721191.9 discloses a method for solving the color mixing defect of multi-color injection molded parts by reasonable layering, which adds a layer of isolation transparent layer between the primary layer and the secondary layer, which can play a certain isolation role, but this method needs to be injected layer by layer continuously, and needs to be cooled and waited after each layer is injected, which will greatly affect the injection efficiency, and the adhesion strength between the layers will also be poor due to temperature difference, so a kind of automatic layered injection molding device and application method is needed to solve this problem. SUMMARY

[0003] The technical problem to be solved by the present application is to provide an automatic layered injection molding device and an application method thereof to solve the above-mentioned defects of the prior art.

[0004] The technical solution adopted by the present application to solve the technical problem is:

[0005] An automatic layered injection molding device is constructed, which comprises an upper mold and a lower mold, the upper mold is provided with an upper mold core, and the lower mold is provided with a lower mold core matched with the upper mold core, wherein it further comprises a separation layer made of a metal braid layer wrapped by hot melt adhesive; a fixing ring for clamping and fixing the separation layer is arranged between the upper mold and the lower mold; the inner space of the upper mold core and the separation layer form an upper injection cavity, and the inner space of the lower mold core and the separation layer form a lower injection cavity, the inner walls of the upper injection cavity and the lower injection cavity are uniformly arranged with glue inlet channels; an induction heating coil for heating the metal braid layer is embedded in the fixing ring, and the fixing ring is composed of a plurality of arc segments, a coil segment is embedded in each arc segment, and a plurality of coil segments are combined to form the induction heating coil; the device further comprises a moving unit for moving the plurality of arc segments, a power supply unit for supplying power to the induction heating coil, and a machine for moving the upper mold longitudinally.

[0006] The automatic layered injection molding device, wherein the upper mold is provided with an annular groove for avoiding the fixing ring, and the upper mold core is located in the annular area of the annular groove.

[0007] The automatic layered injection molding device, wherein the lower mold is provided with a plurality of sliding slopes corresponding to the arc-shaped segments.

[0008] The automatic layered injection molding device, wherein the moving unit comprises a plurality of air cylinders for driving the arc-shaped segments to slide along the corresponding sliding slopes.

[0009] The automatic layered injection molding device, wherein the power supply unit is arranged on any of the arc-shaped segments.

[0010] The automatic layered injection molding device, wherein the coil segment is provided with elastic pole pieces at both ends.

[0011] The automatic layered injection molding device, wherein the metal braid layer comprises a ring-shaped metal ring and a warp and weft metal mesh located in the ring-shaped metal ring, the warp and weft metal mesh is composed of a plurality of metal warps and a plurality of metal wefts which are vertically woven, and the ends of the plurality of metal warps and the plurality of metal wefts are connected with the ring-shaped metal ring.

[0012] An application method of the automatic layered injection molding device, the method comprises the following steps:

[0013] The separation layer made of the metal braid layer wrapped by the hot melt adhesive is placed on the lower mold, and the moving unit drives the plurality of arc-shaped segments to enclose a fixed ring to clamp and fix the separation layer.

[0014] The upper mold descends to contact the fixed ring, at this time, the inner space of the upper mold core and the separation layer enclose an upper injection cavity, and the inner space of the lower mold core and the separation layer enclose a lower injection cavity.

[0015] The two glue feeding channels are respectively fed with glue, and the injection molding of the upper mold layer and the lower mold layer is completed after cooling; the power supply unit supplies power to the induction heating coil, the induction heating coil heats the metal braid layer in a spaced manner, the metal braid layer melts the hot melt adhesive, and the upper mold further descends under the action of the machine to complete hot pressing.

[0016] After cooling, the upper mold ascends to open the mold, and the moving unit drives the plurality of arc-shaped segments to move outward to unload the product.

[0017] The beneficial effects of the present application are that: the separation layer made of hot melt glue wrapped metal braid layer is placed on the lower mold, the moving unit drives multiple arc segments to enclose a fixed ring to clamp and fix the separation layer; the upper mold descends and contacts the fixed ring, at this time the internal space of the upper mold core and the separation layer enclose an upper injection cavity, and the internal space of the lower mold core and the separation layer enclose a lower injection cavity; glue is injected into the two glue channels respectively, and after cooling, the upper layer and the lower layer are injection molded; the power supply unit supplies power to the induction heating coil, the induction heating coil heats the metal braid layer in space, the metal braid layer melts the hot melt glue, and the upper mold further descends under the action of the machine to complete hot pressing; after cooling, the upper mold ascends to open the mold, and the moving unit drives multiple arc segments to move outward to unload the product; by using the method of the present application, not only can two layers be synchronously injection molded, but also the two layers can be combined by hot pressing and hot melt glue, and the combination has good reliability and good controllability. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the present application will be further described below with reference to the drawings and embodiments. The drawings in the following description are only some embodiments of the present application, and those skilled in the art can obtain other drawings according to these drawings without creative labor:

[0019] Figure 1 is a sectional view of an automatic layered injection molding device of a preferred embodiment of the present application;

[0020] Figure 2 is a sectional view of an automatic layered injection molding device of a preferred embodiment of the present application;

[0021] Figure 3 is a sectional view of an automatic layered injection molding device of a preferred embodiment of the present application;

[0022] Figure 4 is a flow chart of an application method of an automatic layered injection molding device of a preferred embodiment of the present application. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions in the embodiments of the present application will be described clearly and completely below. Obviously, the described embodiments are some embodiments of the present application, not all embodiments. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative labor are within the protection scope of the present application.

[0024] The automatic layered injection molding device of the preferred embodiment of the present application is shown in Figure 1 , and Figure 2 and Figure 3, including the upper die 1 and the lower die 2, the upper die 1 is provided with the upper die core 10, the lower die 2 is provided with the lower die core 20 matched with the upper die core, further comprising a separation layer 3, the separation layer 3 is made of a metal braid layer 31 wrapped by hot melt adhesive 30; The fixed ring 4 for clamping and fixing the separation layer 3 is arranged between the upper die 1 and the lower die 2; The inner space of the upper die core 10 and the separation layer 3 form an upper injection cavity, the inner space of the lower die core 20 and the separation layer 3 form a lower injection cavity, the inner walls of the upper injection cavity and the lower injection cavity are uniformly arranged with glue inlet channels 5; The induction heating coil 6 for heating the metal braid layer 31 is embedded in the fixed ring 4, the fixed ring 4 is composed of a plurality of arc segments 40, a coil segment 60 is embedded in each arc segment 40, and the plurality of coil segments 60 are combined to form the induction heating coil 6, both ends of the coil segment 60 are provided with elastic tabs 61, which facilitates the reliability of electrical connection when the plurality of arc segments are closed; The device further comprises a moving unit for moving the plurality of arc segments 40, a power supply unit 8 for supplying power to the induction heating coil 6, and a machine for moving the upper die longitudinally;

[0025] The separation layer 3 made of a metal braid layer 31 wrapped by hot melt adhesive 30 is placed on the lower die 2, the moving unit drives the plurality of arc segments 40 to close to form the fixed ring 4 to clamp and fix the separation layer 3; The upper die 1 goes down and contacts the fixed ring 4, at this time the inner space of the upper die core 10 and the separation layer 3 form an upper injection cavity, and the inner space of the lower die core 2 and the separation layer 3 form a lower injection cavity; Glue is fed into the two glue inlet channels 5 respectively (the glue inlet channel of the upper injection cavity can be designed conventionally, and the glue inlet channel of the lower injection cavity needs to be opened on the lower die 2), and the injection molding of the upper layer and the lower layer is completed after cooling; The power supply unit 8 supplies power to the induction heating coil, the induction heating coil 6 heats the metal braid layer 31 in space, the metal braid layer 31 melts the hot melt adhesive 30, and the upper die 1 further goes down under the action of the machine to complete hot pressing; After cooling, the upper die 1 goes up and the mold is opened, the moving unit drives the plurality of arc segments to move outward, and the product is discharged;

[0026] The application can not only synchronously injection mold two layers, but also rely on hot melt adhesive to hot press and combine the two layers, which has good combination reliability and good controllability of combination thickness.

[0027] Preferably, the upper die 1 is provided with an annular groove 11 avoiding the fixing ring, and the upper die core 10 is located in the annular area of the annular groove 11; the lower die 2 is provided with a plurality of sliding inclined surfaces 21 corresponding to the sliding connection of the arc-shaped segments 40, and the moving unit includes a plurality of air cylinders 70 for driving the arc-shaped segments 40 to slide along the corresponding sliding inclined surfaces 21; the power supply unit 8 (formed by a power supply connector and a wire) is arranged on any arc-shaped segment 40, and preferably the outer part of the arc-shaped segment 40 is made of high-temperature-resistant insulating material; by using the above structure and layout design, the existing injection mold can be directly processed to obtain the automatic layered injection device, thereby reducing the cost.

[0028] It should be noted that the metal woven layer 31 of the present application not only serves as a forming base material during the preparation of the separation layer, but also plays a role in increasing the strength of the separation layer during the injection molding stage, and further plays a role in receiving the energy of the induction heating coil to melt the hot melt adhesive during the hot pressing stage, thereby achieving unexpected technical effects.

[0029] Preferably, the metal woven layer 31 includes an annular metal ring 310 and a warp and weft metal mesh 311 located in the annular metal ring, the warp and weft metal mesh is composed of a plurality of metal warps and a plurality of metal wefts which are perpendicular to each other, and the ends of the plurality of metal warps and the plurality of metal wefts are connected with the annular metal ring.

[0030] In order to ensure the color consistency of the product, the color of the metal warp and the metal weft is preferably light gray or consistent with the color of the upper layer or the lower layer of the injection molded product, and the diameter of the metal warp and the metal weft is not more than 0.1 mm.

[0031] An application method of the automatic layered injection device, the automatic layered injection device is applied as above, wherein the method comprises the following steps:

[0032] S01: placing the separation layer made of the hot melt adhesive wrapped metal woven layer on the lower die, and the moving unit drives the plurality of arc-shaped segments to enclose the fixed ring to clamp and fix the separation layer;

[0033] S02: the upper die goes down to contact the fixed ring, at this time, the inner space of the upper die core and the separation layer enclose to form an upper injection cavity, and the inner space of the lower die core and the separation layer enclose to form a lower injection cavity;

[0034] S03: respectively injecting glue into the two glue channels, and after cooling, the injection molding of the upper layer and the lower layer is completed; the power supply unit supplies power to the induction heating coil, the induction heating coil heats the metal woven layer in space, the metal woven layer melts the hot melt adhesive, and the upper die further goes down under the action of the machine to complete the hot pressing;

[0035] S04: after cooling, the upper die goes up to open the mold, and the moving unit drives the plurality of arc-shaped segments to move outward to unload the product;

[0036] The application can be used to synchronously injection molding two layers, and the two layers can be combined by hot pressing with hot melt adhesive, and the combination is reliable and the thickness is controllable.

[0037] It should be understood that, for those skilled in the art, improvements or changes can be made according to the above description, and all these improvements and changes shall belong to the protection scope of the appended claims of the application.

Claims

1. An automatic layered injection molding device comprising an upper mold and a lower mold, an upper mold core being provided on the upper mold, and a lower mold core being provided on the lower mold and cooperating with the upper mold core, characterized in that, The device further comprises a separation layer made of hot melt glue wrapped metal woven layer; a fixing ring for clamping and fixing the separation layer is arranged between the upper mold and the lower mold; the inner space of the upper mold core and the separation layer form an upper injection cavity, the inner space of the lower mold core and the separation layer form a lower injection cavity, and the inner walls of the upper injection cavity and the lower injection cavity are both arranged with glue feeding channels; an induction heating coil for heating the metal woven layer is embedded in the fixing ring, and the fixing ring is formed by a plurality of arc segments, and a coil segment is embedded in each arc segment, and a plurality of coil segments are combined to form the induction heating coil; the device further comprises a moving unit for moving the plurality of arc segments, a power supply unit for supplying power to the induction heating coil, and a machine for longitudinally moving the upper mold.

2. The apparatus of claim 1, wherein The upper mold is provided with an annular groove for avoiding the fixing ring, and the upper mold core is located in the annular area of the annular groove.

3. The apparatus of claim 2, wherein, The lower mold is provided with a plurality of sliding inclined surfaces for one-to-one sliding connection with the arc segments.

4. The apparatus of claim 3, wherein, The moving unit comprises a plurality of air cylinders for sliding the arc segments along the corresponding sliding inclined surfaces.

5. The apparatus of claim 3, wherein, The power supply unit is arranged on any of the arc segments.

6. The apparatus of claim 1, wherein, Both ends of the coil segment are provided with elastic pole pieces.

7. The apparatus of claim 1, wherein The metal woven layer comprises an annular metal ring and a warp and weft metal net located in the annular metal ring, the warp and weft metal net is formed by vertically weaving a plurality of metal warps and a plurality of metal wefts, and the ends of the plurality of metal warps and the plurality of metal wefts are connected with the annular metal ring.

8. A method of using the automatic layering injection molding apparatus according to any one of claims 1 to 7, wherein The method comprises the steps of: Placing the separation layer made of hot melt glue wrapped metal woven layer on the lower mold, and the moving unit drives the plurality of arc segments to form a fixing ring to clamp and fix the separation layer; The upper mold goes down and contacts with the fixing ring, at this time, the inner space of the upper mold core and the separation layer form an upper injection cavity, and the inner space of the lower mold core and the separation layer form a lower injection cavity; Glue is fed into the two glue feeding channels respectively, and after cooling, the injection molding of the upper layer and the lower layer is completed; the power supply unit supplies power to the induction heating coil, the induction heating coil heats the metal woven layer, the metal woven layer heats and melts the hot melt glue, and the upper mold further goes down under the action of the machine to complete hot pressing; After cooling, the upper mold goes up and opens, and the moving unit drives the plurality of arc segments to move outward to unload the product.

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