KR20100012799A - Multi component injection mold and injection method - Google Patents

Abstract

PURPOSE: A multi injection mold and an injection molding method using the same are provided to injection-mold different kinds or colors of resin at a time. CONSTITUTION: A multi injection mold(100) comprises a movable mold(30), first and second molds(10,20), and a rotating unit(40). The movable mold has identical injection grooves(36) on both sides. The first and second molds have first and second molding cavities(21), respectively. The first mold is engaged with one side of the movable mold so that the first molding cavity forms a first cavity with the injection groove. The second mold is engaged with the other side of the movable mold so that the second molding cavity forms a second cavity with the injection groove. When the first and second molds and the movable mold are separated, the rotating unit reverses the movable mold.

Description

Multi component injection mold and injection method {multi component injection mold and injection method}

The present invention relates to a multi-injection mold and an injection method thereof, and more particularly, to a multi-injection mold and an injection method thereof formed so that double injection can be performed simultaneously in one mold.

In general, double injection means using a mold designed to enable double injection of two dissimilar resins or two identical resins of different colors with two injection devices. First, the first resin is filled into the first cavity to form a first molding. The second molding is filled into a second cavity formed between the first molding and the mold to mold the second molding to be bonded to the first molding.

Such double injection has less shape constraints, wider product application, and diversified designs. In addition, unlike the conventional one, which had to go through a second process of fusion or painting after two injection molding by injecting the product at once, it provides an advantage that the cost can be reduced and the production efficiency of the product can be increased.

However, the conventional double injection had to go through the process of moving the first molding to another cavity filled with different resins in order to secondaryly mold different kinds of resins or resins of different colors in the first molding formed first. In this case, in the process of taking out the first molding and transferring it to the cavity for secondary molding, foreign matters may be attached to the first molding or scratches may cause the quality of the finished product to be deteriorated, resulting in a complicated work process. In addition, in this case, there is a disadvantage that the price of the product rises due to an increase in the manufacturing cost.

The present invention was created to solve the above problems, the first and second cavities are respectively formed so that both the primary molding and the secondary molding in one injection mold, the first cavity and the second cavity It is an object of the present invention to provide a multi-injection mold and an injection method thereof, in which a core forming a rotatable portion is rotatably installed between the first mold and the second mold.

The multi-injection mold according to the present invention is for dual injection of different kinds of resins or resins of different colors, and includes a rotating mold having injection grooves of the same type formed on one side and the other side facing each other, and one side of the rotating mold. A first mold provided with a first molding groove which is joined to form a first cavity together with the injection groove, and a second molding groove which is joined to the other side of the rotating mold to form a second cavity together with the injection groove. When the second mold, the first, the second mold and the rotating mold is separated from the mold, the rotating means for rotating the rotating mold so that the direction of one side and the other side of the rotating mold is opposite to each other.

The first and second molds and the rotational mold are interconnected by guide rods, and the rotational mold is rotatably installed in the disc and the disc to which the guide rod is connected, and the one side and the other side of the rotational mold are rotatably installed. It includes a rotating core formed with an injection groove, the rotating means preferably comprises a rotating pin connected to the rotating core through the disk and a drive for rotating the rotating pin.

The rotating mold may further include a core plate having injection grooves formed on both sides thereof, and a rotating shaft extending from the core plate along a rotational central axis of the rotating mold, wherein the rotating means is connected to the rotating shaft. A driving part may be provided to rotate the rotating shaft, and the first and second molds may include a fastening groove for preventing the rotating shaft from interfering when the first and second molds are coupled to the rotating mold.

In addition, the multi-injection mold further includes a gap maintaining means for maintaining the same distance from the first and second molds when the first and second molds are separated from the first and second molds. The gap maintaining means may include a pinion rotatably installed on the disc, a first rack member having one side fixed to the first mold and the other side engaged with the pinion, and one side fixed to the second mold. And the other side may include a second rack member engaged with the pinion.

In the multi-injection method according to the present invention, when the first and second molds are joined to one side and the other side of the rotating mold, respectively, and the first and second cavities are formed, the first resin is injected into the first cavity. After the first injection step of molding the first injection molding, and after the first injection molding is molded, the first and second molds and the rotating mold are separated, and then the one side and the other side of the rotating mold are reversed. A core rotating step of rotating the rotating mold through a rotating means, and rotating the rotating mold so that one side of the rotating mold in which the first injection molded product is formed is combined with the second mold. A second injection step of molding a second injection molded product by injecting a mold and then injecting a second resin into the second cavity to double injection the second injection molded product into the first injection molded product, and double injection of the first and second injection molded products The finished injection molded product is first and second After the type and isolation of the rotating mold and a take-out step of taking out.

The multi-injection mold according to the present invention can double-inject the heterogeneous resins or resins of different colors in one mold, and since the first and second cavities are formed on both sides of the rotating core, the conventional double injection mold Compared with this, there is an advantage that the size of the injection mold can be miniaturized.

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

1 to 4, the multi-injection mold 100 according to the present invention is an injection mold for double injection.

In FIG. 5, an embodiment of an injection molded product 1 molded by the multi-injection mold 100 of the present invention is shown. The injection molded product 1 is a first injection molded product 2 formed of a first resin as shown. ), And a second injection molding 3 that is coupled to the first injection molding 2 through double injection.

The first and second injection moldings 2 and 3 may be made of heterogeneous materials having different mutual properties to complement the functionality of the products, respectively, and two resins of the same type but different colors to omit the coating process. It may be formed as.

As shown in FIGS. 1 to 4, the multi-injection mold 100 includes rotating means 40 for rotating the first and second molds 10 and 20, the rotating mold 30, and the rotating mold 30. Rotating mold 30 includes a space keeping means 60 for maintaining a gap so that the center of the first and second molds (10, 20) when the mold is separated, the rotation mold 30 is a disc 31 And a rotation core 35 rotatably installed on the disc 31.

The disc 31 has a mounting hole 32 penetrating the upper and lower surfaces in a rectangular frame shape, the fastening holes 33 for fastening the guide rod 50 to the outside of the mounting hole 32 is mounted hole ( It is formed along the outer edge of the 32. In addition, a resin transfer hole 38 through which a transfer pipe through which resin moves may be formed at an outer side of the mounting hole 32.

Rotating core 35 is rotatably installed on the disc 31, the injection groove 36 for forming the first and second cavity (12, 22) is formed on one side and the other side, both sides The injection grooves 36 formed in each are formed in the same manner. In addition, an angle limiting protrusion 39 is formed at one side of the outer circumferential surface of the rotation core 35 to limit the rotation angle of the rotation core 35 when the rotation core 35 rotates. The angle limiting projection 39 is caught by the locking jaw 31a provided on the inner circumferential surface of the disc 31 when the pivoting core 35 rotates to limit the rotational angle.

A pivot shaft 37 is provided at both ends of the pivot core 35 along the pivot center where the pivot core 35 is rotated, and the pivot 31 is rotatable on the disk 31. Boss portion 34 is formed so that it can be coupled.

The first mold 10 is to be joined to one side of the rotating mold 30, the first forming groove 11 is provided on the inner peripheral surface. Therefore, when the first mold 10 and the rotational mold 30 are joined together, the first cavity 12 for forming the first injection molded product 2 by the injection groove 36 and the first molding groove 11 is formed. Is formed.

In the first mold 10, a first sprue bush 13 capable of injecting resin for molding the first injection molding 2 into the first cavity 12, and a first runner through which the injected resin moves ( 14) is formed. The second sprue bush 15 and the second sprue bush 15 for injecting resin into the second cavity 22 formed by the joining of the second mold 20 and the rotating core 35 described later. 15 is provided with a first conveying tube 16 through which the resin injected through it can move, and the first conveying tube 16 protrudes a predetermined length downward through the lower surface of the first mold 10 so that the rotating mold ( 30 is inserted into the disc 31 through the resin transfer hole 38.

The second mold 20 is to be joined with the rotation mold 30 on the other side of the rotation mold 30, the second cavity 22 together with the injection groove 36 on the inner peripheral surface facing the rotation mold 30. The 2nd shaping | molding groove 21 to form is provided.

In addition, the second mold 20 is provided with a second transfer pipe 23 connected with the first transfer pipe 16 when the die 30 is coupled with the rotational mold 30, and is in communication with the second transfer pipe 23. A second runner 24 formed to inject resin into the second cavity 22 is provided. When the second transfer pipe 23 is formed, the second transfer pipe 23 is inserted into the resin transfer hole 38 from the lower portion of the disc 31 and is connected to the first transfer pipe 16 in the disc 31.

In addition, the lifting plate 26 is installed on the second mold 20 so as to be lifted and lowered on the second mold 20 in order to take out the injection-molded product 1 after secondary molding from the second mold 20 after the mold separation. And a take-out means 25 including a take-out pin 27 protruding from the second forming groove 21 to take out the product as the lifting plate 26 moves.

In the present embodiment, the second sprue bush 15 for injecting the resin into the second cavity 22 is formed in the first mold 10. In order to inject all the different kinds of resin injected into each of the first cavity 12 and the second cavity 22 through the upper side of the first mold 10, the resin is injected into the second cavity 22. The second sprue bush 15 may be formed in the second mold 20 to minimize the distance that the resin moves between the second cavity 22 and the second sprue bush 15.

Rotating means 40 is for rotating the pivot core 35, the first and second pivot pins 41 and 42 connected to the pivot shaft 37 through the boss portion 34 of the disc 31. ), And a driving unit 43 for rotating the first pivot pin 41.

The first pivot pin 41 is connected to the pivot shaft 37 through one side of the bosses 34 installed on both sides of the disc 31, and is coupled to the driving part 43 at one end of the driving part 43. The rotational force is transmitted to the rotation shaft 37.

Therefore, when the driving unit 43 is operated, the rotational force of the driving unit 43 is transmitted to the rotational shaft 37 connected to one side of the rotation core 35 through the first rotation pin 41, and the rotational core ( 35) will rotate.

The drive unit 43 may be formed of a servo motor as shown in the present embodiment, or may be made of a hydraulic or pneumatic actuator.

The second pivot pin 42 is connected to the rotational shaft connected to the other side of the pivot core 35 to rotatably support the pivot core 35, but is not illustrated, but the resin is disposed through the interior of the second pivot pin 42. Cooling water for cooling is formed to be supplied and discharged into the rotating mold (30).

The gap holding means 60 is the disc 31 when the mold separation of the first, second molds 10, 20 and the rotational mold 30 is made from the first, second molds (10, 20) This is to maintain the distance so that the spaced distances are equal to each other.

When the disc 31 of the rotating mold 30 is not positioned at the center of the first and second molds 10 and 20, the end of the rotating core 35 and the first end of the rotating core 35 are rotated during the rotation of the rotating core 35. , The separation distance between the second mold (10, 20) is mutually different. Therefore, the distance between the rotating mold 30 is shorter than the rotation radius of the rotating core 35 of the first and second mold 10, 20 between the rotating mold 30, the short distance between the rotation mold 30 In the case of distant molds, the travel distance is unnecessarily increased, causing problems such as loss of power and increase of travel time.

Therefore, it is preferable that the transfer distance of the molds is minimized by allowing the first and second molds 10 and 20 to move at the same distance from the rotating mold 30, respectively.

The space keeping means 60 is a pinion 61 rotatably installed on the disc 31 and a gear tooth to be engaged with the pinion 61, and one end of which is fixed to the first mold 10. It includes a first rack member 62, and a second rack member 63, one end of which is fixed to the second mold and is geared to be engaged with the pinion 61.

The first and second rack members 62 and 63 are fixed to the first and second molds 10 and 20, respectively, and the size and shape of the gear teeth formed on the first and second rack members 62 and 63 are different. Since this is the same, when the first and second molds 10 and 20 and the turning mold 30 are separated from each other, they are rotated by the engagement between the first and second rack members 62 and 63 and the pinion 61. The first and second molds 10 and 20 are moved by the same distance from the mold 30, respectively.

Thus, the distance between the first and second molds 10 and 20 by the gap holding means 60 is maintained at the same distance from the rotation mold 30, so that the rotation core 35 rotates stably with only a minimum moving distance. It is possible to secure the radius of rotation.

In addition, the disc 31 has first and second rack members 62 and 63 engaged with the pinion 61 to maintain the first and second rack members 62 and 63 engaged with the pinion 61. A bearing 64 is provided to prevent the pinion 61 from escaping from the pinion 61.

In the present embodiment, the second mold 20 is fixed and guided by the guide rod 50 to move the rotational mold 30 and the first mold 10 away from the second mold 20. The mold is separated and moved in the opposite direction to form a mold, but the rotating mold 30 is supported and fixed to the injection molding machine or a separate supporting means, and the first and second centering around the rotating mold 30. The molds 10 and 20 may be moved in opposite directions on both sides so that molds and molds may be separated.

Injection method of the multi-injection mold 100 according to the present invention is as follows.

① First injection stage

The first and second molds 10 and 20 and the rotational mold 30 are joined to form the first and second cavities 12 and 22. In the first injection molding, since the first injection molded product 2 is not formed in the second cavity 22, it is preferable not to inject the second resin into the second cavity 22.

When the first cavity 12 is formed through the molding, the first resin is injected into the first cavity 12 through the first sprue bush 13, and then cooled to form the first injection molding 2.

② Core rotation stage

When the molding of the first injection molding 2 is completed in the first cavity 12, the first and second molds 10 and 20 and the turning mold 30 are separated, and then the rotating core 40 is rotated through the rotating means 40. Rotate 35). As a result, one side of the rotating core 35 on which the first injection molding 2 is molded is exposed in the direction toward the second mold 20, and the other side is rotated in the direction toward the first mold 10.

③ 2nd injection step

When the rotation of the rotation core 35 is completed, the first and second molds 10 and 20 and the rotation mold 30 are again mated. The first and second cavities 12 and 22 are formed again by molding, and the first resin is injected into the first cavity 12 through the first sprue bush 13, and the second cavity 22 is injected into the second cavity 22. The second resin is injected into the space between the first injection molded product 2 and the second molding groove 21 through the second sprue bush 15.

In this step, the first and second injection moldings 2 and 3 are simultaneously formed in the first cavity 12 and the second cavity 22, respectively.

④ Dispensing Step

When the molding of the first and second injection moldings 2 and 3 is completed in the first and second cavities 12 and 22, the first and second molds 10 and 20 and the rotation mold 30 are separated from each other. In the 2nd metal mold | die 20, the injection molded product 1 in which double injection was completed by the extraction means 25 is taken out.

While the injection molded product 1 is taken out from the second mold 20, the rotating means 40 rotates the rotating core 35 again to produce a second injection molded product in the first injection molded product 2 formed in the first cavity 12. Prepare (3) for double injection.

After the first injection molded product 2 is formed in the first cavity 12 formed by the rotational mold 30 and the first mold 10 through the rotation of the rotation core 35, the rotational mold 30 is formed. ) And a double injection of the second injection molded product (3) in the second cavity (22) formed by the combination of the second mold (20).

The first injection step and the second injection step are performed by injecting resin into the first and second cavities 12 and 22, respectively, after the first and second molds 10 and 20 and the rotational mold 30 are joined together. Progression is made, and the core rotation step and the ejection step are carried out by the ejection means 25 in the second mold 20 after separation of the molds of the first and second molds 10 and 20 and the rotation mold 30. The entry 1 is taken out and at the same time, the rotating core 35 is rotated by the rotating means 40 so that the progress is made at the same time.

6 shows another embodiment of a multi-injection mold 200 according to the present invention.

The multi-injection mold 200 of the present embodiment is directly coupled to the rotating shaft 120 is connected to the driving die 43, the rotating mold 110, unlike the embodiment shown in Figures 1 to 4 rotating mold 110 ) The whole can be rotated.

Fastening grooves 130 are formed in the first and second molds 10 and 20 so that the rotation shaft 120 does not interfere when the mold is formed.

In addition, the first and second molds 10 and 20 of the present embodiment are moved or opposed to the rotational mold 110 by being moved in directions opposite to each other about the rotational mold 110.

In the multi-injection mold 200 of the present embodiment, the fastening groove 130 is formed in the first and second molds 10 and 20, and the guide rod 50 and the space keeping means 60 are omitted. In addition, except that the second sprue bush is formed in the second mold 20, the technical configuration of the components of the previous embodiment and the remaining components are the same, and the same reference numerals are omitted.

In addition, since the dual injection method through the multi-injection mold 200 of the present embodiment is made through the same process as the injection method of the previous embodiment, a detailed description thereof will be omitted.

1 is an exploded perspective view showing an embodiment of a multi-injection mold according to the present invention;

Figure 2 is a partial excerpt perspective view showing the rotational mold of Figure 1,

3 is a cross-sectional view showing a multi-injection mold of FIG.

4 is a view showing an operating state of the gap maintaining means of the multi-injection mold of FIG.

5 is a partially cut perspective view illustrating an injection molded product through the multi injection mold of FIG. 1;

6 is an exploded perspective view showing another embodiment of a multi-injection mold.

<Explanation of symbols for the main parts of the drawings>

100; Multi Injection Mold

10; First mold

20; 2nd mold

30; Rotating mold

31; negative

35; Rotating Core

40; Rotating means

60; Spacing means

Claims (3)

To double-inject the resin of different materials or the resin of different colors, A rotatable mold having injection grooves of the same type formed on one side and the other side facing each other; A first mold formed on one side of the rotatable mold and provided with a first molding groove for forming a first cavity together with the injection groove; A second mold formed on the other side of the rotatable mold and provided with a second molding groove for forming a second cavity together with the injection groove; And rotating means for rotating the rotating mold so that the directions of one side and the other side of the rotating mold are opposite to each other when the first and second molds and the rotating mold are separated from each other. The first mold includes a first sprue bush for injecting the molten resin into the first cavity and a second sprue bush for injecting the molten resin to be secondary molded into the second cavity. And A first runner formed in the first mold to connect the first sprue bush and the first molding groove to enable the transfer of the resin, and a first transfer extending through the first mold from the second sprue bush; A second conveying tube extending from the end of the second conveying tube and the second conveying tube extending through the second mold and connected to the first conveying tube when the first and second molds and the rotating mold are combined; And a second runner formed in the second mold so as to supply the resin supplied through the first and second transfer pipes to the second cavity by extending into the molding groove. The method of claim 1, The first and second molds and the rotating mold are interconnected by a guide rod, The rotating mold includes a disk to which the guide rod is connected, and a rotating core rotatably installed in the disk and having injection grooves formed at one side and the other side thereof. The rotating means is a multi-injection mold, characterized in that it comprises a rotating pin connected to the rotating core through the disk and a drive for rotating the rotating pin. The method of claim 2, When the mold separation of the first, the second mold and the rotational mold is made, the rotational mold further comprises a spacing means for maintaining the same distance apart from the first, the second mold Multi injection mold.

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