KR102618509B1 - Multi-component injection mold - Google Patents

Abstract

The present invention relates to a multi-injection mold, and more specifically, the corrosion surface formed on the primary injection molded product in the primary molding cavity is prevented from being pressed during the molding of the secondary injection mold, and the raw materials for the secondary injection mold are prevented from being pressed into the primary injection molded product. It relates to a multi-injection mold that can prevent leakage to the side of the injection product or to the outside of the secondary molding cavity.
The multi-injection mold of the present invention can prevent the corrosion surface from being deformed because the corrosion surface of the primary injection product facing the movable mold is in contact with the anti-pressing member made of an elastic material when forming the secondary injection product.
In addition, in the multi-injection mold of the present invention, the sealing pin formed around the core is partially inserted into the movable mold when molding the secondary injection product to support the resin for molding the secondary injection product and the primary injection product, thereby improving the sealing function. It is possible to prevent the resin for secondary injection molding from overflowing or flowing into the primary injection product extending outside the secondary molding groove.

Description

Multi-injection mold {Multi-component injection mold}

The present invention relates to a multi-injection mold, and more specifically, the corrosion surface formed on the primary injection molded product in the primary molding cavity is prevented from being pressed during the molding of the secondary injection mold, and the raw materials for the secondary injection mold are prevented from being pressed into the primary injection molded product. It relates to a multi-injection mold that can prevent leakage to the side of the injection product or to the outside of the secondary molding cavity.

In general, multi-color products with two or more colors or multi-products with two or more structures in one product adopt the multi-injection method to reduce the inconvenience of having to manufacture them in multiple sets.

This multi-injection method is an insert method in which different products are mounted on a mold and injected, and two different molds are manufactured and mounted simultaneously on one injection machine, and then the movable side plate is rotated after the first product is injected to produce the second product. A rotary method is used to inject the first product, and then a turntable method is used in which the movable side plate rotates to inject the second and third products after injecting the first product.

The insert method has problems in that workability for manufacturing injection products is poor and production costs are relatively high, and the turntable method has problems in that the injection machine and mold become relatively large.

Republic of Korea Patent Publication No. 2000-0049735 discloses a mold structure for multiple injection molding, and Registered Patent No. 10-0091724 discloses a multi-injection mold rotary injection molding machine.

And in Patent Publication No. 2002-0064859, a rotary multi-injection mold is published, and in Registered Utility Model No. 0317955, the rotation operation structure of a rotary multi-injection mold is published. The posted injection mold is capable of performing injection molding work on different materials by having a rotating plate that is lifted and rotated by a cylinder and rack and pinion method. However, this injection molding method has a relatively complex structure because rotation and elevating means are installed within the mold, and productivity cannot be improved.

In order to solve this problem, the present applicant, as disclosed in Republic of Korea Patent Publication No. 10-0849533, has a relatively simple structure and is easy to apply a mechanical bonding structure when molding a synthetic resin product that is not chemically bonded. , we have researched and developed a multi-injection mold that can reduce production costs during manufacturing.

However, the conventional multi-injection mold forms a second cavity for injection molding the secondary injection product of the multi-injection mold when partially injection molding the secondary injection product on the primary injection product having a corrosion surface with protrusions. There is a problem in that the corrosion surface of the first injection product is pressed against the inner circumferential surface.

In addition, in the conventional multi-injection mold, when molding a secondary injection product that is partially covered by the primary injection product, the liquid resin for molding the secondary injection product is spread over a larger area than the area to be molded in the primary injection product. Problems with entries overflowing or flowing down often arise.

Republic of Korea Patent Publication No. 10-0849533: Multi-injection mold Republic of Korea Patent Publication No. 10-1453839: Double injection mold for case molding of mobile devices

The present invention is intended to solve the above problems, and provides a multi-mold device that can prevent the corrosion surface formed on the first injection product by the mold from being deformed when forming the second injection product on the first injection product. I want to do it.

In addition, the present invention seeks to provide a multi-mold device that can prevent liquid resin for molding secondary injection products from overflowing or flowing into the primary injection product extending outside the cavity for molding secondary injection products. .

The multi-injection mold of the present invention to achieve the above object includes a fixed mold; a table installed in the fixed mold and provided with a core that supports the first injection molded product with a corrosion surface formed on the outside; A movable mold that is movable to be molded or separated from the fixed mold and is molded to the core on one side and has a secondary molding groove formed on one side to form a secondary molding cavity for molding a second injection product to the first injection product; Provided, the movable mold is formed of an elastic material on one side of the secondary molding groove facing the corrosion surface not covered with the resin for molding the secondary injection product to prevent the corrosion surface from being pressed when molded with the core. It is characterized by having a pressing prevention member to prevent.

The movable mold is formed with a pressure buffering groove on one side of the inner peripheral surface that forms the secondary molding groove along with one side of the anti-press member, and is accommodated in the pressure buffer groove to accommodate the anti-press member. It is preferable that an elastic support member is installed to elastically support the.

The table is installed with a plurality of cores symmetrical to each other, and the processing mold is molded with any one of the cores to further form a primary molding groove to form a primary molding cavity for the primary injection molding. In a state where the movable mold is spaced apart from the fixed mold, the table is raised and separated from the fixed mold so that the primary injection product molded in the primary molding cavity is placed below the secondary molding groove. a table rotation means for rotating the table; When the secondary molding groove and the core are molded, a sealing means including at least one sealing pin that protrudes from the circumference of the core with respect to the table and presses the primary injection product in the direction of the movable mold. It is desirable to do so.

The table is formed with a pin advance/retract guide hole penetrating in the direction of the movable mold and the fixed mold to guide the advance/retract of the sealing pin, and the movable mold is supplied to the secondary molding cavity to mold the secondary injection product. It is preferable that a pin receiving groove is formed in which one side of the sealing pin supporting the first injection product is accommodated.

The multi-injection mold of the present invention can prevent the corrosion surface from being deformed because the corrosion surface of the primary injection product facing the movable mold is in contact with the anti-pressing member made of an elastic material when forming the secondary injection product.

In addition, in the multi-injection mold of the present invention, the sealing pin formed around the core is partially inserted into the movable mold when molding the secondary injection product to support the resin for molding the secondary injection product and the primary injection product, thereby improving the sealing function. It is possible to prevent the resin for secondary injection molding from overflowing or flowing into the primary injection product extending outside the secondary molding groove.

1 is a partial side cross-sectional view of a state in which the movable mold is raised relative to the fixed mold after the first injection product is molded in a multi-injection mold according to an embodiment of the present invention;
Figure 2 is a side cross-sectional view of the multi-injection mold of Figure 1 in which the movable mold is combined with the fixed mold and the first and second injection products are molded in the first molding cavity and the second molding cavity;
Figure 3 is an enlarged side cross-sectional view of the secondary molding cavity side of the multi-injection mold of Figure 2.

Hereinafter, the multi-injection mold of the present invention will be described in more detail with reference to the attached drawings.

1 to 3 show a multi-injection mold 10 according to an embodiment of the present invention.

The multi-injection mold 10 according to an embodiment of the present invention sequentially injects two different resins or molten synthetic resins of different colors in one mold to form a product made of two different resins or two resins of different colors. It is for this purpose.

Referring to Figures 1 to 3, a multi-injection mold 10 according to an embodiment of the present invention includes a fixed mold 20; A movable mold 70 that can be moved separately from the fixed mold 20 and has primary molding grooves 74 and secondary molding grooves 76 formed in parallel; A primary molding cavity ( 6) or a secondary molding cavity ( A table 50 in which a plurality of cores 61 forming 7) are formed symmetrically to each other; After the movable mold 70 is separated from the fixed mold 20, the primary injection product 1 molded in the primary molding cavity 6 and the core 61 supporting the primary injection product 1 are 2. It is arranged to face the car forming groove 76, and includes a table rotation means for rotating the table 50 after separating it from the fixing mold 20.

The other side of the fixed mold 20 is installed on the first support plate 11, and the movable mold 70 has guide rods 14 extending from the first support plate 11 passing through the first support plate 11. It is installed on the second support plate 16, which can be moved adjacent to or away from, and faces the fixed mold 20 and the table 50.

A plurality of cores 61 installed on the table 50 are formed in the same shape and are arranged symmetrically side by side. The table 50 can be rotated 180° after being separated from the fixed mold 20 by the table rotation means.

The movable mold 70 is fixed to the second support plate 16 and includes a movable mold body 71 with primary molding grooves 74 and secondary molding grooves 76 facing each of the plurality of cores 61. , The core 61 is formed of an elastic material on one side of the secondary molding groove 76 facing the corrosion surface 2 of the primary injection product 1, which is not covered with resin for molding the secondary injection product 4. ) and the inner peripheral surface of the movable mold body 71, which forms a secondary molding groove 76 together with the anti-pressing member 81, which prevents the corrosion surface 2 from being pressed when molded, and one side of the anti-pressing member 82. It is provided with an elastic support member 84 on one side that is accommodated in a pressure buffering groove 78 formed to accommodate the anti-press member 81 and elastically supports the anti-press member 81.

The second support plate (16) has a first sprue bush (17) for injecting resin for molding the first injection product into the first molding cavity (6) on one side, and a second molding cavity (7) on the other side. A second sprue bush 18 is installed to inject resin for molding the second injection product.

In addition, the movable mold body 71 includes a first runner 72 that supplies resin from the first sprue bush 17 to the primary molding cavity 6, and a second sprue bush 18 for secondary molding. A second runner 73 is provided to supply resin to the cavity 7.

In addition, the primary molding groove 74 is formed with a plurality of protrusions 74a or grooves 74b on one side so that a corrosion surface 2 is formed on one side of the outer peripheral surface of the primary injection molded product 1.

The anti-pressure member (81) is formed so that one side facing the corrosion surface (2) of the primary injection product (4) is in contact with the primary injection product (4), and is made of an elastic material such as urethane, so that it can be used for secondary molding. When the groove 76 and the core 61 are joined, the protrusions 3 of the corrosion surface 2 are prevented from being pressed and deformed.

The anti-pressure member 81 is preferably formed so that its other surface is at a certain distance from the pressure buffer groove 78 so that it is uniformly elastically supported by the elastic support member 84 accommodated in the pressure buffer groove 78. And, as shown in FIG. 3, the movable mold 70 is formed in a plate shape made of a hard material to face the other side of the pressure prevention member 81, and has a constant shape with respect to one side in the direction in which the pressure buffer groove 78 is drawn. A uniform buffer guide plate 86 supported on the elastic support member 84 may be further installed to have a distance.

A plurality of elastic support members 84 are provided and spaced apart at regular intervals within the pressure buffer groove 78, and a general gas spring can be applied.

Meanwhile, the table rotation means injects the primary injection product (1) into the primary molding cavity (6) and then pushes the table (50) seated on the fixed mold (20) toward the movable mold (70) to form the fixed mold (10). ), then rotate it 180 degrees like the core 61 and position it to face the secondary injection molding groove 76, so that a second injection molded product (1) can be formed using a different resin. 4) It has a configuration that allows injection molding.

The table rotation means is not specifically shown, but includes a cylindrical cover mounted on the fixing mold 20 so as to penetrate the fixing mold 20, and a shaft 65 inserted into the inside of the cover and having one side coupled to the table 50. ) and a plurality of tapered roller bearings (not shown) installed at regular intervals between the shaft 65 and the cover. In addition, the table rotation means includes an actuator such as a stepping motor or hydraulic motor for rotating and elevating the shaft 65 together with the table 50.

In addition, the multi-injection mold 10 according to an embodiment of the present invention is formed around the core 61 when the secondary molding groove 76 and the core 61 are molded for molding the secondary injection product 4. It is further provided with a sealing means including a sealing pin 101 that protrudes from the table 50 and presses the primary injection molded product 1 in the direction of the movable mold 70 .

As a sealing means, a pin advance/retract guide hole 52 is formed in the table 50 that penetrates in the direction of the movable mold 70 and the fixed mold 29 to guide the advance/retract of the sealing pin 101, and the movable mold has a table ( A pin receiving groove 79 is formed in which one side of the sealing pin 101 protruding from 50 is accommodated.

Referring to FIG. 3, the pin receiving groove 79 includes resin supplied to the secondary molding cavity (7) for molding the secondary injection product (4), and a sealing pin to support the primary injection product (1). A portion of the head portion 102 of 101 is accommodated.

In addition, the sealing means is a sealing pin ( 101) is formed so as to protrude from the table 50 and is formed to protrude on one side of the fixed mold 20 facing the movable mold 70, and is received by the pin advance/retract guide hole 52 to support the sealing pin 101. Provided with a jaw (21)

As shown, the sealing pin 101 extends in the direction of the movable mold 70 and the fixed mold 20, but is formed so as not to deviate in the direction of the fixed mold 20.

That is, the sealing pin 101 includes a head portion 102 that presses the primary injection product 1 in the direction of the movable mold 70, and a bar-shaped body portion having a smaller cross-sectional area or diameter than the head portion 102. (103) is provided.

The pin advance/retract guide hole 52 is formed through the table 50 to support the head portion 102 of the sealing pin 101 when the table 50 protrudes from the fixing mold 20. And, the pin advance/retract guide hole 52 is formed on one end facing the fixing mold 20 to accommodate the pin support jaw 21 formed on the fixing mold 20.

As shown, the pin support jaw 21 preferably has a larger area than the body portion 102 of the sealing pin 101. In this case, one end of the pin advance/retract guide hole 52 is connected to the sealing pin 101. The inner diameter is formed to be expanded stepwise to accommodate the pin support jaw 21 having a larger area than the body portion 102.

However, unlike shown, the pin support jaw 21 may be formed to protrude to have an area equal to or smaller than that of the body portion 102 of the sealing pin 101.

When dividing the pin advance/retract guide hole 52, a first penetrating portion 52a formed through a penetrating portion corresponding to the cross-sectional area of the head portion 102 of the sealing pin 101 on the side facing the movable mold 20, and a fixed portion. A second penetrating portion (52b) penetrating corresponding to the cross-sectional area of the pin support jaw (21) on the side facing the mold, and a sealing pin (101) between the first penetrating portion (52a) and the third penetrating portion (52b). ) can be divided into a third penetrating portion 52c formed through the body portion 102 corresponding to its cross-sectional area.

The operation of the multi-injection mold 10 according to an embodiment of the present invention having the configuration described above will be described.

First, with the table 50 seated on the fixed mold 20, the movable mold 70 is moved to join the fixed mold 20, and then the first sprue bush 17 and the first runner 72 are By supplying resin to the primary molding cavity (6) formed by joining the primary molding groove (74) and one core (61), the first injection product (4) having a corrosion surface (2) on one side is first formed. Shape it.

When the first injection product (4) is molded, the movable mold (70) is separated from the fixed mold (20) and the table (50), and the first injection product (1) is supported on one core (61). The table 50 is protruded from the fixing mold 20 through the table rotation means and rotated 180 degrees, and then the table 50 is re-seated on the fixing mold 20.

And, the primary molding cavity 6 formed by molding the primary molding groove 74 and one core 61, and the secondary molding cavity 6 formed by molding the secondary molding groove 76 and another core 61. The movable mold 70 is again molded with the fixed mold 20 so that the molding cavity 7 is formed.

The movable mold (70) is combined with the fixed mold (20), and different resins are simultaneously supplied to the first molding cavity (6) and the second molding cavity (7) for molding the first and second injection products, respectively. Thus, the first injection product (1) and the second injection product (4) are molded.

When molding the second injection product (4), the corrosion surface (2) of the first injection product (1) is in contact with the anti-pressing member (81) made of urea carbon material facing within the second molding groove, causing the corrosion surface (2) The projections 3 are prevented from being deformed.

In addition, when molding the second injection product (4), the sealing pins (101) formed around the core (61) partially protrude with respect to the table (50) and are received into the movable mold (70), thereby forming the first injection product (1). Since it supports, it is possible to prevent the resin for molding the secondary injection product (4) from overflowing or flowing into the primary injection product (1) extending outside the secondary molding groove (76).

Since the pin support jaw 21 is not formed on the side of the fixing mold 20 facing the first molding groove 74, the sealing pin 101 is against the table 50 when molding the first injection product 1. It does not protrude.

Meanwhile, unlike shown, the sealing means does not have a pin support jaw 21, and the sealing pin 101 has one side facing the fixed mold 20 fixed to the table 50 and facing the movable mold 70. An actuator structure in which one side is fixed to the table 50 and the other side can be advanced and retreated by hydraulic pressure or air armor and is flexible in length may be applied. In this case, the pin support jaw 21 may be controlled by a controller (not shown) to extend in length and protrude onto the table 50 only when it faces the secondary forming groove 76.

In the multi-injection mold 10 according to an embodiment of the present invention, when molding the second injection product (4) on the first injection product (1), corrosion of the first injection product (1) toward the movable mold (70) occurs. Since the surface is in contact with the anti-pressing member 81 made of an elastic material, it is possible to prevent the corrosion surface from being deformed.

In addition, in the multi-injection mold 10 according to an embodiment of the present invention, when molding the secondary injection product 4, the sealing pin 101 formed around the core 61 is partially inserted into the movable mold 70 to form the primary injection mold 70. By supporting the injection product (1), the sealing function is improved to prevent the resin for molding the second injection product (4) from overflowing or flowing into the first injection product (1) extending outside the secondary molding groove (76). can do.

In addition, the multi-injection mold 10 according to an embodiment of the present invention provides uniform cushioning of a hard material formed in a plate shape between the anti-pressure member 81 made of urethane material and a plurality of elastic support members 84 spaced at regular intervals. Since the guide plate 86 is installed, the anti-pressure member 81 can uniformly cushion the corrosion surface of the primary injection molded product 1.

The present invention has been described with reference to the embodiments shown in the drawings, but these are merely exemplary, and those skilled in the art will understand that various modifications and other equivalent embodiments are possible therefrom. Therefore, the true technical protection scope of the present invention should be determined by the technical spirit of the attached registered claims.

1: 1st injection product 4: 2nd injection product
10: Multi injection mold 20: Fixed mold
50: Table 70: Movable Mold
81: anti-pressing member 84: elastic support member
101: Ceiling pin

Claims (5)

Fixed mold;
a table installed in the fixed mold and provided with a core that supports the first injection molded product with a corrosion surface formed on the outside;
A movable mold that is movable to be molded or separated from the fixed mold and is molded to the core on one side and has a secondary molding groove formed on one side to form a secondary molding cavity for molding a second injection product to the first injection product; Equipped with
The movable mold is
On one side of the secondary molding groove facing the corrosion surface that is not covered with the resin for molding the secondary injection product, a pressure prevention member is formed of an elastic material and is provided to prevent the corrosion surface from being pressed when molded with the core. A pressure buffering groove is formed on one side of the inner peripheral surface forming the secondary molding groove along with one side of the anti-press member to accommodate the anti-press member,
an elastic support member accommodated in the pressure buffer groove and elastically supporting the anti-pressure member;
Multi-injection, characterized in that a uniform buffering guide plate is mounted on the other surface of the anti-pressure member, formed in a plate shape of a hard material and supported on the elastic support member to have a certain distance with respect to one surface in the direction in which the pressure buffer groove is drawn. mold. delete Fixed mold;
a table installed in the fixed mold and having a plurality of symmetrical cores supporting the primary injection molded product with a corrosion surface formed on the outside;
A primary molding groove that is movable to be molded or separated from the fixed mold and is molded to one of the cores on one side to form a primary molding cavity for molding the primary injection product, and the primary molding groove on the other side. a movable mold formed with a secondary molding groove that is joined with another core on which an injection product is seated to form a secondary molding cavity for molding a second injection product to the first injection product;
With the movable mold spaced apart from the fixed mold, the table is raised and separated from the fixed mold so that the primary injection product molded in the primary molding cavity is placed below the secondary molding groove. Table rotation means for rotating;
When the secondary molding groove and the core are molded, a sealing means including at least one sealing pin that protrudes from the circumference of the core with respect to the table and presses the primary injection product in the direction of the movable mold; ,
The movable mold is formed of an elastic material on one side of the secondary molding groove facing the corrosion surface that is not covered with the resin for molding the secondary injection product, and is pressed to prevent the corrosion surface from being pressed when molded with the core. It is provided with an anti-pressure member, and a pressure buffering groove is formed on one side of the inner peripheral surface forming the secondary molding groove together with one side of the anti-pressure member, and is received in the pressure buffer groove and is pressed. An elastic support member is installed to elastically support the prevention member,
The table is formed with a pin advance/retract guide hole penetrating in the direction of the movable mold and the fixed mold to guide the advance/retract of the sealing pin,
The movable mold is formed with a pin receiving groove in which the resin supplied to the secondary molding cavity for molding the secondary injection product and one side of the sealing pin supporting the primary injection product are accommodated,
The fixed mold is
The table is rotated so that the core supporting the primary injection product faces the secondary molding groove, and then when seated in the fixed mold, one side of the sealing pin protrudes with respect to the table to press the primary injection product. to be accommodated in the pin receiving groove,
A multi-injection mold, characterized in that a pin support jaw is provided on one surface of the fixed mold facing the movable mold to be received by the pin advance/retract guide hole and supports the sealing pin.
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