KR101522678B1

KR101522678B1 - A double injection mould having sliding core

Info

Publication number: KR101522678B1
Application number: KR1020140036459A
Authority: KR
Inventors: 장희수
Original assignee: 에이테크솔루션(주)
Priority date: 2014-03-28
Filing date: 2014-03-28
Publication date: 2015-05-22

Abstract

The present invention relates to a double injection molding mold with a sliding core, which has, at a rotary side mold, a sliding core having a groove to injection-mold a second product on the bottom surface of a first product already injection-molded. A double injection molding mold with a sliding core according to the present invention comprises: a first fixed side mold having a first nozzle; a second fixed side mold having a second nozzle; and a rotary side mold having a rotary first mold and a rotary second mold, wherein the rotary first mold closes with the first fixed side mold to injection-mold a first product, and then the rotary side mold rotates for the rotary first mold to close with the second fixed side mold to injection-mold a second product; the rotary first mold and the rotary second mold are equipped with at least one sliding core having a groove; and when the rotary side mold rotates to injection-mold the second product on the injection-molded first product, the at least one sliding core moves so that the groove thereof can be placed below the first product to allow injection-molding of the second product on the bottom surface of the first product.

Description

[0001] A DOUBLE INJECTION MOLD HAVING SLIDING CORE WITH SLIDING CORES [0002]

The present invention is characterized in that two kinds of resins having different properties and colors are used, injection molding of a primary product with a primary resin, and rotation of the rotary side mold are carried out so that a secondary resin The present invention relates to a double injection molding die for injection molding a secondary product with a sliding core mounted on a rotary mold and a secondary product on the bottom of a primary injection molded product. To a double injection molding die equipped with a sliding core capable of injection molding.

In general, in injection molding, a cavity having a product shape is formed in a mold when the mold is closely attached to the mold, and a resin melted at an appropriate temperature is injected and filled at an appropriate pressure and speed into the cavity, When the filled resin is cooled and solidified, the mold is separated from the mold, and the molded product is taken out. At this time, in order to perform injection molding of a composite product having different kinds of resins or different colors, I am using it.

There are turn-table type, rotary type, and the like in the double injection molding metal mold. Generally, the part used as the mold metal mold in which the molds are in contact with each other during the primary product injection molding, The secondary product can be injection molded only on the front surface or the side surface of the primary product. That is, the secondary product can not be injection molded on the bottom surface of the primary product. However, if there is a thicker part in the first product, the underside of the thicker part may be recessed due to the shrinkage. It is difficult to compensate for such depressed part during the molding of the second product. In addition, An injection molding die capable of injection molding a secondary product is also required on the bottom surface of the primary product.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a dual injection molding die in which a secondary product is injection molded on a primary product after injection molding the primary product, The present invention is to provide a dual injection molding die equipped with a sliding core, which is capable of injection molding a secondary product on the bottom surface of a primary injection molded product by being mounted on a rotary side mold.

According to an aspect of the present invention, there is provided a dual injection molding die equipped with a sliding core, including: a primary fixed die provided with a primary nozzle; A secondary stationary side mold having a secondary nozzle; The rotary 1 mold and the primary fixed side mold are closed and the primary product is injection molded. Then, the rotary side mold is rotated, and the rotary 1 mold is rotated to the 2 A double injection molding die in which a secondary product is injection-molded by injection molding with a car fixing-side mold, wherein at least one sliding core having a groove formed therein is mounted on the rotary mold and the rotary mold, The sliding core is moved so that the groove of the sliding core is positioned below the primary product when the rotary mold is rotated to perform injection molding of the secondary product so that the secondary product can be injection molded on the underside of the primary product .

The sliding core may be slidably mounted in a slot formed in the molding surface of the rotating-side mold.

It is also preferred that at both sides of the slot in the position where the primary product and the secondary product are molded there is further provided upward cores for receiving the molded product, It is preferable that the upward core that lifts the primary product so that the sliding core can be easily moved and the secondary core that is placed at the position where the secondary product is to be molded can take out the finished product in which the primary product and the secondary product are integrated Do.

On the other hand, the double injection molding die equipped with the sliding core is, for example, a double injection molding die such as a rotary type in which the primary fixing side mold and the secondary fixing side mold are fixed side molds integrated so that their mold surfaces coincide, And the rotary core is integrated with the rotary mold so that the rotary mold and the rotary mold can coincide with each other. The sliding core can be slidably mounted in the slot formed to communicate with the rotary mold and the rotary mold. In this case, the sliding core may be formed with two recesses equally spaced apart from each other at a position where the primary product is molded.

Alternatively, the double injection molding die equipped with the sliding core may be a double injection molding die such as a rotary type, in which the primary fixing side mold and the secondary fixing side mold are fixed side molds integrally formed so that their mold surfaces coincide, And a rotary 2 mold and a rotary 2 mold are integrally formed so as to be coincident with each other, and each of the rotary 1 mold and the rotary 2 mold has one slot, and each one of the sliding cores slidably moves Respectively. In this case, one groove may be formed in each sliding core.

On the other hand, the double injection molding die equipped with the sliding core is a double injection molding die such as a turntable type, in which the primary stationary side mold and the secondary stationary side mold are spaced apart from each other in the opening direction, The two molds are rotation-side molds in which respective mold surfaces are located opposite to each other so as to face the primary stationary-side mold and the secondary stationary-side mold, and the sliding core can be mounted on the rotary 1 mold and the rotary 2 mold, have.

The double injection molding die equipped with the sliding core according to the present invention can double injection mold the secondary product on the front side and the side surface of the first injection molded product as well as the bottom surface of the primary product, It is possible to compensate for the depression caused by the shrinkage to prevent the deformation of the product, and it is possible to satisfy the desire of the consumer who desires various forms of the double injection molding product.

Other advantages and effects will be described in the detailed description with reference to the drawings.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a plan view of a rotating-side mold in a dual injection-molding mold equipped with a sliding core according to an embodiment of the present invention; FIG.
2 is a perspective view illustrating the operation principle of a dual injection molding die equipped with a sliding core according to an embodiment of the present invention.
FIG. 3 is a plan view of a rotation-side mold for helping to understand the operation principle of the double injection molding die equipped with the sliding core of FIG.
Fig. 4 is a cross-sectional view taken along the line "II " in Fig. 3 (D).

Hereinafter, a dual injection molding die equipped with a sliding core according to a preferred embodiment of the present invention will be described with reference to the accompanying drawings, but the present invention is not limited thereto. In describing the present invention, the description of known functions and configurations may be omitted.

FIG. 1 is a perspective view of a double injection molding die equipped with a sliding core according to an embodiment of the present invention. Referring to FIGS. 1 to 4, FIG. 2 is a perspective view showing the operation principle of a dual injection molding die equipped with a sliding core 50 according to an embodiment of the present invention, and FIG. 2 is a perspective view showing a double injection molding die 3 is a plan view of a rotation-side mold 40 provided to help understand the working principle of a double injection molding die equipped with the sliding core 50 of FIG. 2, and FIG. 4 is a cross- II ". For reference, common and known components in a dual injection mold are not shown for brevity of illustration.

Referring to FIGS. 1 to 3, the rotary type double injection mold according to an exemplary embodiment of the present invention is illustrated. The present invention can be applied to a double injection molding die such as a turntable type as well as a rotary type. The double injection molding die equipped with the sliding core 50 according to the embodiment of the present invention includes the primary stationary side mold 10, the secondary stationary side mold 20 and the rotating side mold 40. [ The primary stationary mold 10 and the secondary stationary mold 20 are provided with a primary nozzle 11 and a secondary nozzle 21 through which molten resin is injected from an injection machine (not shown) The side mold 40 includes a rotating one metal mold 41 and a rotating two metal mold 42. When the first stationary-side mold 10 and the rotating-one mold 41 of the rotating-side mold 40 are closely contacted with each other, the first stationary-side mold 10 and the second stationary- The molten resin (primary resin) is injected into the primary cavity through which the primary product 1 is molded via the primary resin passage 12 to form the primary product 1 (shown in gray in the figure). Thereafter, the mold is opened and the rotary mold 40 is rotated 180 degrees around the rotation axis parallel to the mold opening direction with the primary product 1 attached, The mold 20 is closed. The molten resin (secondary resin) different from that of the primary product, which is injected through the secondary nozzle 21 provided in the secondary stationary metal mold 20, passes through the secondary resin passage 22, When the tea product 2 is injected into the secondary cavity to be molded, the secondary product 2 (shown in red in the figure) is molded on the preformed primary product 1. At the same time, the primary product 1 can be injection-molded between the primary stationary mold 10 and the rotary 2 mold 42. Then, when the mold is opened and the finished product in which the primary and secondary products 1 and 2 are integrated is taken out, the rotating-side mold is rotated 180 degrees again, and the above process can be repeated.

In the case of the rotary type as shown in the figure, the mold surfaces of the primary stationary side mold 10 and the secondary stationary side mold 20 may coincide with each other to form one integrated stationary side mold 30, The mold surfaces of the rotation 1 mold 41 and the rotation 2 mold 42 can be matched with each other to form one integrated rotary die 40.

1, a single communicating slot 60 is formed in the rotating one metal mold 41 and the rotating two metal mold 42 in a direction perpendicular to the direction of opening. In this slot 60, (50) is slidably mounted. The movement of the sliding core 50 may be performed by a separate driving motor (not shown) such as a hydraulic cylinder or a pneumatic cylinder, or by a cam or other mechanical mechanism (not shown). On the sliding core 50, recesses 51 and 52 having concave central portions are formed one by one symmetrically with respect to a position where the primary product 1 is molded (Fig. 3 (a) Reference). Although the grooves 51 and 52 are round aspheric surfaces for molding an aspherical lens, they may have various shapes depending on the shape of the product to be molded.

Although not shown, the first stationary-side mold 10 and the second stationary-side mold 20 are located at the upper portions of the rotating 1 mold 41 and the rotating 2 mold 42 in FIG. 1 so as to correspond to each other, The primary product 1 is injection-molded between the rotary 1 mold 41 and the primary fixing die 10 and the rotary 1 mold 41 is rotated 180 degrees with the primary product 1 attached And is rotated with the secondary stationary metal mold 20, and the secondary product 2 is molded therebetween. Here, the rotary 1 mold 41 and the rotary 2 mold 42 are alternately moved in accordance with an injection molding cycle to be described later.

Referring to FIGS. 2 and 3, the operation principle of the double injection molding die equipped with the sliding core 50 will be described according to an embodiment of the present invention. FIG. 2 is a perspective view of the rotation-side mold 40, and FIG. 3 is a plan view of the rotation-side mold 40. Note that in FIG. 2, in order to show the position of the sliding core 50, Side mold 30 and the rotating-side mold 40. [0051] As shown in Fig.

Hereinafter, with reference to FIGS. 2 and 3, the operation principle of the double injection molding die equipped with the sliding core 50 will be described. The mold is closed in the state where the sliding core 50 is first moved to one side (right side in the drawing) of the slot 60 and the mold 1 is closed between the primary fixing side mold 10 and the rotating one mold 41 Shows the state in which the car product (1) is injection-molded. At this time, the primary product 1 is molded on the flat portion without recesses on the sliding core 50 and the grooves 51 and 52 are formed on the sliding core 50 in a symmetrical manner at the position where the primary product 1 is molded. .

(B) shows a state in which the mold is opened and the sliding core 50 is moved to the other side (left side in the figure) of the slot 60, that is, in the direction of the arrow in the drawing. At this time, the formed primary product 1 remains at the position, and the recesses 51 formed on the sliding core 50 move to the lower side of the primary product 1. In order to facilitate the movement of the sliding core 50, upward sides of the slots 60 at positions where the primary product 1 and the secondary product 2 are formed are formed with upward cores, that is, A second ascending core 72 is provided so that the first ascending core 71 slightly lifts the preformed primary product 1 when the sliding core 50 is moved.

(C) shows a state in which the positions of the rotation 1 mold 41 and the rotation 2 mold 42 are changed by rotating the rotation side mold 40 by 180 degrees as shown in the drawing. In this state, the rotating two-mold 42 corresponds to the primary stationary-side mold 10, and the rotating-one-mold 41 is moved to the secondary stationary side And corresponds to the mold 20. The central flat portion and the groove 52 of the sliding core 50 come to the primary stationary side mold 10 side.

The molten resin flowing through the secondary nozzle 21 and the secondary resin passage 22 is transferred between the secondary stationary mold 20 and the rotating one mold 41 And the secondary product 2 is molded. Since the groove 51 is located on the bottom surface of the primary product 1 that has been formed at this time and the groove 51 has a door including the communication with the secondary cavity around the primary product 1, 22 can be injected into the bottom surface of the primary product 1 that has been molded and the secondary product can be molded on the bottom surface of the primary product 1. [ At the same time, molten resin through the primary nozzle 11 and the primary resin passage 12 is injected into the primary cavity between the primary stationary mold 10 and the rotary 2 mold 42 So that the second primary product 1 'can be molded.

(E) shows a state after the mold is opened and the finished product in which the primary and secondary products (1) and (2) are integrated is taken out. At this time, by using the first ascending core 71 installed on both sides of the slot 60, the peripheral part of the finished product can be raised from the molding surface of the rotating side mold 40 to take out the finished product. (E), it is seen that the finished product is not seen to be taken out, and the second primary product 1 'is molded in the rotating two-mold 42. This is similar to the state of (a), and the process can be repeated again (b). It should be noted that although the grooves 51 of the sliding core 50 are used in the molding of the secondary product in the cycles of FIGS. 2 and 3, in the next cycle, the other grooves 52 are used for molding the secondary product Will be. Also, the roles of the first ascending core 71 and the second ascending core 72 will be alternately switched depending on the cycle, such as the rise of the primary product 1 or the extraction of the secondary product 2.

4 is a cross-sectional view taken along the line I-I in FIG. 3 (d), that is, a cross-sectional view of the secondary product 2 in a state in which the secondary product 2 is molded on the primary product 1. 4, between the sliding core 50 and the first ascending core 71 between the secondary stationary mold 20 and the rotating one mold 41 (which will be the rotating two mold 42 in the next cycle) It will be seen that the primary product 1 is placed on top of the primary product 1 (which will be the second ascending core 72 in the next cycle) and the secondary product 2 is molded on this primary product 1. At this time, a groove 51 (which will be a groove 52 in the next cycle) is located below the primary product 1, and the molten resin for the secondary product 2 is supplied through the secondary resin passage 22, Is injected into the secondary cavity around the primary product (1) including the lower part of the car product (1).

Although the sliding core 50 and the slot 60 are provided in the rotary 1 mold 41 and the rotary 2 mold 42, that is, the rotary side mold 40, Two of these sliding cores and slots may be provided for each of the rotating 1 mold 41 and the rotating 2 mold 42, that is, two for the rotating side mold 40. In this case, only one groove may be formed in each sliding core.

Further, the operation of the above-described sliding core 50 and the upward cores 71 and 72 can be performed by a cam or other mechanical mechanism (not shown) or by separate driving motors (not shown) (Not shown) can be controlled to suit the injection molding process of the primary product and the secondary product.

While the present invention has been described with reference to the preferred embodiments thereof, it is to be understood that the present invention is not limited to the specific embodiments disclosed herein, but may be embodied in many other specific forms without departing from the spirit or essential characteristics thereof. For example, The present invention is not limited to this.

Although not shown in the drawing, in the case of a turntable-type double injection molding die, the primary stationary-side mold and the secondary stationary-side mold are separate and independent molds, and are spaced apart from each other in the opening direction, A rotation-side mold is provided. The rotating-side mold can be rotated around a rotational axis perpendicular to the opening direction by the turntable. On one side of the rotating-side mold, that is, on the side facing the first stationary-side mold, a rotating-one mold is provided. On the opposite side of the rotating-one mold, Respectively. Thus, when the molten resin is injected and injected through the primary nozzle provided in the primary stationary side mold, the primary product is molded, and the rotating one mold is attached to the primary product The mold is rotated 180 degrees while the first mold is closed with the second stationary mold. When a different type of molten resin is injection-injected through the secondary nozzle provided in the secondary stationary mold, the secondary product is molded on the primary molded product. At the same time, the primary product can be injection molded between the primary stationary mold and the rotary 2 mold. Then, when the mold is opened and the finished product in which the primary and secondary products are integrated is taken out, the rotating side mold is rotated 180 degrees again, and the above process can be repeated. In the case of such a turntable double injection molding mold, a sliding core is mounted on each of a rotating mold and a rotating mold, and each of the sliding cores may have only one groove formed therein. When the secondary product is injection molded, that is, The sliding core can be moved so that the groove is located on the bottom surface of the preformed primary product when the rotating-side mold is closed with the secondary stationary-side mold.

By doing so, it is possible to injection-mold the secondary product on the bottom surface of the primary molded product to compensate the shrinkage problem in the thickened part, and a variety of double injection molded products can be used in various fields.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, And it is also within the scope of the present invention. Accordingly, the scope of protection of the present invention should be construed in accordance with the following claims, and all technical ideas within the scope of equivalents thereof should be construed as being included in the scope of the present invention.

1: Primary product 2: Secondary product
10: primary stationary side mold 11: primary nozzle
12: Primary resin passage 20: Secondary stationary side mold
21: secondary nozzle 22: secondary resin passage
30: stationary side mold 40: rotation side mold
41: rotation 1 mold 42: rotation 2 mold
50: sliding core 51, 52: groove
60: Slot 71, 72: First up core, 2nd up core

Claims

A first stationary-side mold provided with a primary nozzle, a secondary stationary-side mold provided with a secondary nozzle, a rotary-side mold including a rotary 1 mold and a rotary 2 mold, Wherein the first product is injection-molded, and then the rotary-side mold is rotated so that the first rotary-type mold is closed with the second fixed-side mold so that the secondary product is injection-molded,
Wherein at least one sliding core having a groove formed therein is mounted on the rotary mold 1 and the rotary mold 2 so that when the rotary mold is rotated to perform injection molding of the secondary product on the injection molded primary product, Wherein the sliding core is moved so that the groove is located under the primary product, so that the secondary product can be injection-molded on the bottom surface of the primary product.

The method according to claim 1,
Wherein the sliding core is slidably mounted in a slot formed on the molding surface of the rotating-side mold.

3. The method of claim 2,
Characterized in that on both sides of the slot at the position where the primary product and the secondary product are molded there is further provided upward cores for receiving the molded product.

The method of claim 3,
The lifting core, which is placed at a position where the primary product is molded, lifts the primary product to facilitate the movement of the sliding core, and the upward core to be placed at a position where the secondary product is to be molded, And a finished product in which the secondary product is integrated is taken out.

The method according to claim 1,
Wherein the primary stationary side mold and the secondary stationary side mold are a fixed side mold integrally formed so that their mold surfaces coincide with each other, and the rotary 1 mold and the rotary 2 mold are integrated with each other so that the mold surfaces are aligned, , And a sliding core is mounted so as to be slidable in a slot formed so as to communicate with the rotary mold 1 and the rotary 2 mold.

6. The method of claim 5,
Wherein the sliding core is formed with two grooves spaced equidistantly symmetrically from a position where the primary product is molded.

The method according to claim 1,
Wherein the primary stationary-side mold and the secondary stationary-side mold are a stationary-side mold integrated so that the mold-facing surfaces coincide with each other, the rotating-one mold and the rotating- Wherein the first and second rotary molds are provided with one slot, and one sliding core is slidably mounted in each of the slots.

The method according to claim 1,
Wherein the first stationary-side mold and the second stationary-side mold are spaced apart from each other in the mold-opening direction, and wherein the molds of the first rotating mold and the second rotating mold form respective first molds Wherein the sliding core is mounted on the rotary 1 mold and the rotary 2 mold, respectively, and wherein the sliding core is mounted on the rotary 1 mold and the rotary 2 mold, respectively.