KR20220039187A - injection molding machine capable of automatic production of double moulding products - Google Patents

Abstract

The present invention relates to an injection molding machine capable of automatically and continuously producing heterogeneous resin molded products to maximize work productivity. To this end, the present invention includes: a square rotating body installed on the upper portion of a base of an injection molding machine so as to be rotatable by 360 degrees and provided with four walls for mounting a core; lower cores for injection molding of a primary molded product forming the outside of a double molded product and mounted on the central portion of each of the four wall surfaces of the square rotating body; first and second movable platens standing facing each other with the square rotating body interposed therebetween and reciprocally moving toward both side wall surfaces of the square rotating body through a cylinder unit; first and second phase cores mounted on the first and second movable platens to form first and second cavities for injection molding of first and second molded products; and a rotation driving mechanism for rotating the square rotating body at intervals of 90 degrees after injection molding.

Description

Injection molding machine capable of automatic production of double molding products

The present invention relates to an injection molding machine for producing dual molded products, and more particularly, to an injection molding machine capable of automatic production of dual molded products capable of double continuous injection molding of products through heterogeneous resins that are not mutually fused.

In general, an injection molding machine mounts an upper mold and a lower mold on a clamping device and molds them together to form a cavity identical to the shape of the product to be molded. It is a molding machine.

In addition, double injection molding is a method of injecting by applying two materials (or resins of different colors) to one part. After injection molding, the mold is rotated 180 degrees by manpower so that the secondary resin can be injected and injected into the cavity of the secondary mold and the space of the primary molded product. This conventional double injection molding is variously applied to electronic products, household goods, or mobile phones, and in particular, the outer case of electronic products such as mobile phones is a transparent synthetic resin (or transparent colored resin) for emitting the light of the light emitting part installed inside the device to the outside. ) is first injection-molded, and then the opaque inner resin is secondarily injection-molded inside the first injection resin, so that the function and design of the outer case can be produced in a variety of ways.

However, in the conventional double injection molding method, one material is first injection molded, then moved to a new mold (second mold) by manpower, and the remaining materials are injection molded. there is

On the other hand, the printing layer is formed integrally on the surface of the multi-injection molded product by pre-arranging (insert) the film with the printing layer inside the mold. Even after, the workability is remarkably deteriorated as a finishing operation is required to remove the edge of the film exposed to the outside.

In addition, since the film fixing guide configuration for insert fixing the film provided with the printing layer to the mold needs to be added again, the injection mold configuration becomes complicated. In addition, since the conventional printing layer is provided on the surface of the multi-injection molded article, even if the UV coating is applied, it has a disadvantage that it can be easily erased due to scratches during product use.

The present invention is intended to solve these problems; It is an object of the present invention to provide an injection molding machine capable of automatic production of dual molded products capable of maximizing work productivity by automatically and continuously producing dual molded products in which two or more types of resins that are not mutually fused are combined.

In addition, according to the present invention, production workability can be improved by directly forming a printing layer on the inner surface of the primary molded article forming the exterior of the molded article, and since the printed layer (pattern) is formed on the inner surface of the primary molded article, the product is in use It is to provide an injection molding machine capable of automatic production of double molded products that cannot be erased on the surface.

The present invention for achieving this object; In an injection molding machine capable of automatic production of a double molded product capable of continuously injection molding a dual molded product having an exterior and an interior made of different materials; The injection molding machine; a quadrangular rotatable body provided with a lower end rotatably 360 degrees through a rotating shaft on the upper part of the base of the injection molding machine, and provided with four wall surfaces for core mounting; Harcores respectively mounted on the central portions of the four wall surfaces of the quadrangular rotating body and for injection molding the primary molded product forming the exterior of the double molded product; first and second movable platens which are placed opposite to each other with the rectangular rotatable body interposed therebetween and are arranged to be reciprocally moved toward both side walls of the rectangular rotatable body through a cylinder unit; A first phase core mounted on the first movable platen and opened and closed with a lower core opposite to the first movable template side among the lower cores on the wall of the rectangular rotating body to form a first cavity for injection molding the primary molded product Wow; It is mounted on the second movable platen, and among the lower cores on the wall of the rectangular rotating body, the primary molded product is molded therein, and is opened and closed with the lower core opposite to the second movable platen to form the inside of the double molded product a second phase core forming a second cavity for injection molding the secondary molded product to be integrated with the inner surface of the primary molded product; It is provided at the base of the injection molding machine, and the first and second upper cores are closed to opposite lower cores so that the double molded product can be continuously injection molded, and the first and second molded products are injection molded and then opened. a rotation driving means for rotating the rectangular rotating body at intervals of 90 degrees; It is characterized in that it is provided.

In addition, the present invention; It is characterized in that the second phase core is provided with an ejection rod to drop and take out the double molded product when the second movable mold plate is separated from the square rotating body after the secondary molded product is molded.

In addition, the present invention; A plurality of ties for guiding the reciprocating movement of the first and second movable template by one end of the injection molding machine are disposed to pass through the edge of the first movable template and the other end to penetrate the edge of the second movable template It is characterized in that it further comprises a bar.

In addition, the present invention; forming the primary molded article by injecting a transparent molten resin into the first cavity formed between the first upper core and the lower core; An opaque molten resin is injected into the second cavity formed between the primary molded article and the second phase core inside the core to mold the secondary molded article.

In addition, the present invention; In the injection molding machine, the first upper core and lower core are closed to mold the primary molded product, and the second upper core and lower core are closed to form the secondary molded product, while the lower core on the wall of the rectangular rotating body is formed. It is characterized by further comprising a marking device for printing and marking a design on the inner surface of the primary molded product exposed in a molded state therein.

In addition, the present invention; The marking device is characterized in that it is a laser marking machine for directly laser marking a design on the inner surface of the primary molded product.

In addition, the present invention; The marking device is characterized in that it is a screen printing machine for directly screen-printing a design on the inner surface of the primary molded product.

According to the injection molding machine capable of automatic production of a double molded article according to the present invention; There is an effect of maximizing work productivity by automatically and continuously producing a double molded product made by combining different types of resins that are not mutually fused while rotating a rectangular rotating body with cores arranged on four sides at 90 degree intervals.

In addition, production workability can be increased by directly forming a printed layer on the inner surface of the primary molded article forming the outside of the molded article, and since the printed layer is formed on the inner surface of the primary molded article, it is not erased during product use. There is this. In particular, since a separate finishing operation is not required after the double molded product is taken out, there is an advantage that productivity can be significantly increased compared to the prior art.

1 is a perspective view showing a double molded article manufactured by an injection molding machine according to the present invention.
2 is an exploded view of a double molded article manufactured by an injection molding machine according to the present invention.
3 is a plan view schematically showing the structure of an injection molding machine capable of automatic production of a double molded product according to the present invention.
4 is a side view schematically showing the structure of an injection molding machine capable of automatic production of a double molded product according to the present invention.
5 and 6 show the mold closing operation state of the injection molding machine according to the present invention.
7 is an excerpt showing the operation state of the marking device constituting the injection molding machine according to the present invention.
8 is a view showing the mold opening operation of the injection molding machine according to the present invention.

Next, one preferred embodiment according to the present invention configured as described above will be described in detail with reference to the accompanying drawings.

Brief description of the accompanying drawings; 1 and 2 show the structure of a molded article molded through the injection molding machine according to the present invention, Figures 3 and 4 schematically show the structure of the injection molding machine according to the present invention, Figures 6 to 8 are This shows the operating state of the injection molding machine according to the invention. (In the description of the present invention, the dual molded product is shown as an example of the front case of the MP-3 electronic product.)

First, referring to FIGS. 1 and 2 , the double molded product 1 produced by the injection molding machine according to the present invention is molded through a primary mold in which a transparent resin raw material is injected, and a primary having a predetermined thickness forming the outside of the molded product The molded product 1a, the design layer 1c (printing layer) made by directly printing letters or numbers to be expressed on the inner surface of the primary molded product 1a through a marking device, and an opaque resin through the secondary mold It is divided into a secondary molded product (1b) forming the inside of the molded product by molding so as to be integrated with the inner surface of the primary molded product (1a) as a raw material. That is, the double molded product 1 is composed of a layer of a primary molded product 1a made of a transparent resin and a layer of a secondary molded product 1b made of an opaque resin.

As shown in Figs. 3 and 4, the injection molding machine according to the present invention for continuously and automatically producing such a double molded product (1) is installed 360 degrees on the upper part of the base 10, and four A rectangular rotatable body 20 having a wall surface, and a core 30 to 33 for injection molding a primary molded product 1a that is mounted on each of the four walls of the rectangular rotatable body 20 to form a double molded product 1 ) and the first and second movable platens 40 and 50, respectively disposed opposite to each other so as to be reciprocally moved with the rectangular rotating body 20 therebetween, and the first movable platen 40 is mounted on the primary The first phase core 60 forming a first cavity for molding the molded product 1a, and the second movable mold plate 50 are mounted to form a double molded product 1 on the inner surface of the primary molded product 1a There is provided a second phase core 70 and the like that form a second cavity for integrally injection-molding the molded product 1b, and the detailed structure of each component is as follows.

First, the rectangular rotatable body 20 is installed so that the lower end is rotatably 360 degrees through the rotation shaft 21 at the center upper portion of the base 10, and mold cores can be detachably mounted on each wall surface. . In addition, the rectangular rotating body 20 is programmed through a control panel (not shown) to rotate in one direction at intervals of 90 degrees while the mold is opened and closed at regular intervals (injection molding time), which is the rectangular rotating body 20. It is made by the rotation driving means 80 for direct rotation. The rotation driving means 80 is provided on the base 10 of the injection molding machine, and there is a reduction gearbox for reducing the power of the motor to rotate the rotation shaft 21 of the square rotating body 20 at intervals of 90 degrees. etc are built in. Therefore, the rotational driving means 80 is molded to the lower cores 30 and 32 in which the first and second upper cores 60 and 70 respectively face each other so that the double molded product 1 can be continuously injection molded. When the primary and secondary molded products 1a and 1b are injection molded and opened, the rectangular rotating body 20 is driven to rotate at intervals of 90 degrees (counterclockwise in the drawing).

The lower cores 30 to 33 are mounted on the central portions of the four walls of the rectangular rotating body 20, respectively, and are molded with the first upper core 60 to form the outside of the double molded product 1 (1a) for injection molding. These lower cores 30 to 33 are all the same, and are molded with the first upper core 60 to form a first cavity for molding the primary molded product 1a.

And the first and second movable platens 40 and 50 are installed to face each other with the rectangular rotating body 20 interposed therebetween on the upper portion of the base 10 of the injection molding machine, and through the cylinder units 41 and 51 . It is arranged to be able to reciprocate, respectively, toward both side walls of the rectangular rotating body 20 . The first and second movable platens 40 and 50 are formed in an approximately quadrangular plate shape, and a tie bar 90 passes through each of the edge corners to guide the reciprocating movement. That is, one end of the tie bars 90 is disposed to penetrate the edge of the first movable template 40 , and the other end of the tie bars 90 is disposed to penetrate the edge of the second movable template 50 . Accordingly, the first and second movable platens 40 and 50 are guided through the tie bars 90 by the driving of the cylinder units 41 and 51 to be able to accurately reciprocate the upper part of the base 10 . (In the embodiment of the present invention, it has been described as reciprocating the first and second movable platens 40 and 50 through a direct pressure mechanism that directly transmits pressure through the cylinder units 41 and 51, but limited to this It goes without saying that a link mechanism that can indirectly move the first and second movable platens 40 and 50 can be applied.) Such a first movable template 40 and second movable template 50 First and second screw cylinder devices 61 and 71 for supplying molten resin for molding the primary molded product 1a and the secondary molded product 1b at high pressure, respectively, are connected to each other.

In addition, the first phase core 60 is mounted on the first movable template 40 and is opposed to the first movable template 40 side among the lower cores 30 to 33 of the wall surface of the square rotating body 20 . (30) is molded to form a first cavity for injection molding the primary molded product (1a) constituting the double molded product (1). The first cavity is supplied with molten resin through the first screw cylinder device 61 to mold the primary molded product 1a, which will be described in detail in the description of the injection process.

And the second upper core 70 is mounted on the second movable platen 50, and among the lower cores 30 to 33 on the wall of the square rotating body 20, the lower core in which the primary molded product 1a is molded therein. (32) is combined. That is, the second phase core 70 is molded with the lower core 32 opposite to the second movable platen 50 to form the secondary molded product 1b forming the inside of the double molded product 1, and the primary molded product 1a. To form a second cavity for injection molding so as to be integrated into the inner surface of the. The second cavity is supplied with molten resin through the second screw cylinder device 71 to mold the secondary molded product 1b on the inner surface of the primary molded product 1a, which will be described in detail in the description of the injection process. In addition, after molding the secondary molded product 1b in the second phase core 70, when the second movable mold plate 70 is separated from the square rotating body 20, take out and drop the molded dual molded product 1 An ejection rod 72 is provided for It is preferable that this is done while taking out the double molded product 1 molded in the process of separating the second phase core 70 from the lower core 32 .

On the other hand, on one side of the base 10 of the injection molding machine, the design is directly printed and marked on the inner surface of the primary molded product 1a exposed in a molded state on the lower core 31 of the wall of the rectangular rotating body 20. Marking Device 100 is placed. In this marking device 100, the first upper core 60 and the lower core 30 are molded to form the primary molded product 1a, and the second upper core 70 and the lower core 32 are molded to form the secondary In the process of molding the molded product 1b, a design (1c; see FIG. 2) such as numbers or letters is directly marked on the inner surface of the semi-hardened primary molded product 31 exposed as it was molded to the core 32 during the molding process. It is a (printing) device. In an embodiment of the present invention, the marking device 100 is composed of a multi-joint laser marking machine capable of directly laser marking the design 1c on the inner surface of the primary molded product 1a, but is not limited thereto, and the primary molded product ( It goes without saying that a screen printing machine capable of directly screen printing the design 1c on the inner surface of 1a) can be applied.

Next, a process of injection molding the double molded product 1 through the injection molding machine according to the present invention configured as described above will be described with reference to FIGS. 5 to 8 .

First, as shown in Figures 5 and 6; The first and second movable platens 40 and 50 are advanced toward the wall surfaces of both sides of the rectangular rotating body 20 through the cylinder units 41 and 51 (refer to the direction of the arrow in FIGS. 5 and 6 ).

Accordingly, the first phase core 60 mounted on the first movable template 40 is combined with the lower core 30 opposite to the first movable template 40 side to form the outside of the double molded product 1 . A first cavity for injection molding the molded article 1a is formed. In this first cavity, transparent molten resin (transparent ABS resin, etc.) is injected at high pressure through the first screw cylinder device 61 , whereby the primary molded product 1a is molded in the lower core 30 . This primary molded product 1a faces the marking device 100 in a state positioned inside the lower core 30 when the square rotating body 20 rotates 90 degrees.

In addition, as shown in FIG. 7 , together with the process of forming the first molded product 1a by combining the first upper core 60 and the lower core 30, the lower core of the wall surface of the rectangular rotating body 20 ( 31) The process of printing and marking the design (1c) such as numbers or letters on the inner surface of the primary molded product (1a) exposed in a molded state is simultaneously performed. That is, the design 1c is directly marked on the inner surface of the primary molded product 1a in a semi-cured state by being molded inside the core 31 through the marking device 100 . As such, the primary molded product 1a with the design 1c directly printed and marked on the inner surface is positioned in the lower core 31 when the square rotating body 20 is rotated 90 degrees on the second movable template 50 side. will be directed towards

In addition, the primary molded product (1a) at the same time as the molding and the design (1c) marking process; The second phase core 70 mounted on the second movable mold plate 50 is molded with the lower core 32 opposite to the second movable mold plate 50 side to form the inside of the double molded product 1 . (1b) A second cavity for injection molding is formed. At this time, the primary molded product 1a is already molded inside the lower core 32 to be molded with the second-phase core 70 due to the molding with the first-phase core 60 . Therefore, the second phase core 70 forms a second cavity for injection molding so that the secondary molded product 1b constituting the inside of the double molded product 1 is integrated into the inner surface of the primary molded product 1a during molding. By injecting the opaque molten resin at high pressure through the second screw cylinder device 71 into this second cavity, the secondary molded product 1b is integrated with the inner surface of the primary molded product 1a on which the design 1c is printed. is molded

And, as shown in FIG. 8, when the first-phase core 60 and the second-phase core 70 are separated from the rectangular rotating body 20 side, the double molded product 1 after the molding is completed is the lower core 32. As the ejection rod 72 provided on the second phase core 70 protrudes elastically while coming out of it, the ejection rod 72 is taken out and dropped, so that the double molded article 1 can be obtained. In this way, the double molded article 1 exits and the empty lower core 32 is positioned in a standby state (empty core state) when the square rotating body 20 rotates 90 degrees.

As described above, in the injection molding machine according to the present invention, the first and second upper cores 60 and 70 are rotated at intervals of 90 degrees while rotating the quadrangular rotatable body 20 having the lower cores 30 to 33 arranged on four sides at 90 degree intervals. When the mold is opened and closed, the first molded product (1a) molding step, the design (1c) marking (printing) step, the secondary molded product (1b) molding step, and the dual molded product (1) made by combining different types of resins that are not mutually fused. It is automatically produced continuously.

In addition, by forming the pattern 1c directly on the inner surface of the primary molded product 1a through the marking device 100 after molding the primary molded product 1a constituting the exterior of the molded product, production workability can be improved. In addition, since the pattern 1c is formed on the inner surface of the primary molded product 1a, it is not erased during product use.

On the other hand, in the embodiment of the present invention, although it has been described that the primary molded product 1a is molded using a transparent molten resin as a raw material, it can also be molded through a translucent molten resin, and even in this case, marking (printing) directly on the inner surface It can be implemented so that the pattern 1c is clearly visible.

10… … … Base 20… … … square rotating body
30-33… … … Harcore 40... … … 1st movable platen
50… … … 2nd movable platen 60... … … Phase 1 core
70… … … Phase 2 core 80… … … rotary drive means
90… … … tie bar

Claims (3)

In an injection molding machine capable of automatic production of a double-molded product capable of continuously injection-molding a dual-molded product (1) having an exterior and an interior through different dissimilar materials;
The injection molding machine;
a quadrangular rotatable body 20 having a lower end installed rotatably 360 degrees through a rotating shaft 21 on an upper portion of the base 10 of the injection molding machine, and provided with four wall surfaces for mounting a core;
Harcores 30 to 33 for injection molding the primary molded product 1a that are respectively mounted on the central portions of the four walls of the rectangular rotating body 20 and form the exterior of the double molded product 1;
The first and the second are installed to face each other with the rectangular rotatable body 20 interposed therebetween and are respectively arranged to be reciprocally moved toward both side walls of the rectangular rotatable body 20 through the cylinder units 41 and 51 . a movable template 40 and 50;
It is mounted on the first movable platen 40 and is opened and closed with the lower core 30 opposite to the first movable platen 40 side among the lower cores 30 to 33 of the wall surface of the square rotating body 20 . a first phase core 60 forming a first cavity for injection molding the primary molded product 1a;
It is mounted on the second movable template 50, and among the lower cores 30 to 33 of the wall of the rectangular rotating body 20, the first molded product 1a is molded inside, and the second movable template ( 50) A second cavity for injection molding the secondary molded product 1b that opens and closes with the lower core 32 opposite to the side and forms the inside of the double molded product 1 to be integrated with the inner surface of the primary molded product 1a a second phase core 70 forming a;
It is provided on the base 10 of the injection molding machine and the first and second upper-phase cores 60 and 70 are respectively opposed to each other so that the double-molded product 1 can be continuously injection-molded. ) closed to the primary and secondary molded products (1a) and (1b), when opened after injection molding, rotation driving means 80 for rotating the rectangular rotating body 20 at intervals of 90 degrees;
The first upper core 60 and lower core 30 are closed to form the primary molded product 1a, and the second upper core 70 and lower core 32 are closed to form the secondary molded product 1b ), a marking device for printing and marking the design (1c) on the inner surface of the primary molded product (1a) exposed in a molded state inside the lower core (31) of the wall surface of the rectangular rotating body (20) during molding (1c) 100); An injection molding machine capable of automatic production of double molded products, characterized in that it is provided.
The method of claim 1,
The marking device 100 is an injection molding machine capable of automatic production of double molded products, characterized in that it is a laser marking machine for laser marking the design (1c) directly on the inner surface of the primary molded product (1a).
The method of claim 1,
The marking device 100 is an injection molding machine capable of automatic production of double molded products, characterized in that it is a screen printer for directly screen printing the design (1c) on the inner surface of the primary molded product (1a).

Images