KR100864248B1 - Injection-molded product ejecting apparatus for mold assembley - Google Patents

Abstract

An apparatus for taking out a product from a mold assembly is provided to facilitate discharge of air to the outside of cavity when melted synthetic resin is injected into the cavity and to allow air to be easily introduced between a main core and a product when the product is separated from the main core. An apparatus for taking out a product from a mold assembly comprises a fixed side plate(20) installed at a fixed side of a molding apparatus. A first mold plate(22) has a first main core(26) and is installed at the fixed side plate. A movable side plate(30) is installed at the movable side of the molding apparatus. A second mold plate(36) is installed at the movable side plate while being selectively in close contact with the first mold plate. The second mold plate has a second main core(40). At least one eject pin(50) is movably installed in a movement space(46) formed by space blocks(32) installed between the movable side plate and the second mold plate.

Description

Injection-molded product ejecting apparatus for mold assembley

1 is a cross-sectional view showing the configuration of a mold assembly in which a specific embodiment of the product extraction device according to the present invention is employed.

Figure 2 and Figure 3 is an operating state showing the process of taking out the product in an embodiment of the present invention.

* Description of the symbols for the main parts of the drawings *

20: fixed side plate 22: first mold plate

24: First cavity 26: First main core

28: locating ring 30: movable side plate

31: through part 32: spacer block

33: Fastening hole 33 ': Fastening bolt

34: base plate 36: second plate

38: Second Cavity 40: Second Main Core

40 ': recessed groove 42: cavity

46: moving space 48: eject plate

50: eject pin 52: separation board

52 ': slope M: product

54: tanned bolts

The present invention relates to a mold assembly, and more particularly, to a product takeout device for taking out a product from the mold assembly.

Injection mold assembly is injection molding a product having a specific shape using a synthetic resin material. Such a mold assembly is provided with a main core having a shape corresponding to that of the product to repeatedly produce a product of the same shape.

In such an injection molding process, the molten synthetic resin is injected into the cavity formed by the main core, and when the synthetic resin is cured after a certain time, the main core is separated and the product is taken out of the cavity.

In order to separate the product out of the cavity, an eject pin is provided in the mold assembly. Eject pins are provided through the main core, but the synthetic resin is injected to manufacture the product and is provided inside the cavity without protruding in the process of curing the synthetic resin. In the process of separating the product after the resin has cured, the eject pins protrude into the cavity and push the product out. In this case, the larger the area of the product to be manufactured, the more eject pins are required.

On the other hand, the main core is formed in two or more so as to be detachable for taking out the cured product, the cooling line is installed inside the main core to help cure the molten synthetic resin filled in the cavity.

However, the prior art as described above has the following problems.

If the product area is large and provided with a large number of eject pins, when the cooling line is installed on the main core through which the eject pin is installed, the cooling line cannot be installed at the position where the eject pin penetrates, which hinders the installation of the cooling line. This happens.

In case of ejecting the product with eject pin, the area where eject pin pushes the product is small so that a large pressure is applied to the contact point of the eject pin and the product, and there is a difference in the force applied to each contact. There was a problem that a defect occurs during.

On the other hand, in the injection molding process, air is present inside the cavity. Such air is gas generated from a molten synthetic resin or air from outside of the cavity. If such air is present in the cavity there is a problem that the shape of the product is not molded properly or the whitening phenomenon occurs on the surface of the product by air.

In addition, when the eject pin is protruded to separate the product from the main core during the process of separating the product after the product is cured, if the product and the main core are in a vacuum state, a large pressure is applied to separate the product, and the eject pin is pressurized. There was a problem that occurs when the product is damaged while receiving the slip.

Therefore, the present invention has been made to solve the above-mentioned conventional problems, an object of the present invention is to reduce the number of eject pins provided in the mold assembly to reduce the number of parts and facilitate the installation of the cooling line.

And another object of the present invention is to provide a mold assembly that is easy to take out the product by increasing the area of the take-out means to push the product during product take-out.

In addition, another object of the present invention is to smoothly discharge the air from the inside of the cavity to the outside when the molten synthetic resin is injected into the cavity of the mold assembly, the air is smooth between the main core and the product when the product is separated from the main core It is to provide a mold assembly that can be introduced easily.

According to the technical features of the present invention for achieving the above object, the present invention is a fixed side plate is installed on the fixed side of the molding machine, the first main plate is provided with a first main core is installed on the fixed side plate, and A movable main plate provided on the movable side of the molding machine and a second main core provided on the movable side plate to be in close contact with the first mold plate and to cooperate with the first main core to form a cavity corresponding to the shape of the product. At least one eject pin movably installed in a moving space formed by a second plate, a spacer block provided between the movable side plate and the second plate, and a longitudinal direction of the eject pin at one end of the eject pin; Separation board installed at right angles to selectively eject the product by protruding from the second main core as the eject pin is moved toward the first plate It is configured to include.

The upper surface of the second main core facing the fixed side plate is formed with a recessed inlet portion wider than the bottom portion, the lower surface of the separation board facing the movable side plate is formed in a shape corresponding to the shape of the recessed groove It is seated in the recess groove.

An upper surface of the separation board facing the fixed side plate forms part of the cavity for product formation.

The eject pin is provided at least three or more spaced apart from the center of gravity of the separation board.

The separating board is fastened by the eject pin and the tannery bolt.

In the product taking-out apparatus according to the present invention having such a configuration, the number of eject pins is reduced, which makes it easy to install a cooling line under the main core, and prevents whitening and damage of the product, thereby greatly improving product reliability of injection molding. There are advantages to it.

Hereinafter, with reference to the accompanying drawings a specific embodiment of the product extraction device of the mold assembly according to the present invention will be described in detail.

Figure 1 is a cross-sectional view showing the internal configuration of a mold assembly employing a specific embodiment of the product extraction apparatus according to the present invention.

As shown in these figures, the fixed side plate 20 is installed on the fixed side of the molding machine. The fixed side plate 20 has a plate shape having a predetermined area, and the first mold plate 22 is installed on one surface thereof. The fixed side plate 20 and the first mold plate 22 may be coupled to each other using a bolt or the like. The first cavity 24 is formed in the first template 22. The first cavity 24 is formed to penetrate through the first mold plate 22, and the fixed side plate 20 forms an inner bottom of the first cavity 24.

The first main core 26 is installed inside the first cavity 24. The first main core 26 has grooves corresponding to a portion of the outer surface of the product M. Of course, a plurality of first core cavities (not shown) are formed in one first main core 26, and the same product may be manufactured in each of these core cavities.

Meanwhile, the locating ring 28 is installed on the fixed side plate 20. The locating ring 28 serves to guide the fixed side plate 20 is mounted on the fixed side of the molding machine. An injection hole (not shown) is made through the fixed side plate 20 through the center of the locating ring 28, which is a portion for supplying the molten synthetic resin to the cavity 42 to be described below.

The movable side plate 30 is provided on the movable side of the molding machine. The movable side plate 30 also has a plate shape having an area corresponding to the fixed side plate 20. Spacer block 32 is installed on the movable side plate 30, and the movable side plate 30 and the spacer block 32 pass through fastening holes 33 drilled in the respective fastening bolts 33 ′. By combining with each other.

Support plate 34 is installed by the support of the spacer block 32, the spacer block 32 and the support plate 34 may also be coupled to each other using a bolt or the like. The second plate 36 is installed on the support plate 34 so as to face the first plate 22. The first mold plate 22 and the second mold plate 36 are in close contact with each other when the product M is molded, and are separated when the molded product M is taken out. This is done by moving the movable side of the molding machine relative to the stationary side.

A second cavity 38 is formed in the second template 36 through the second template 36. The second cavity 38 is formed in a cross-sectional area corresponding to the position corresponding to the first cavity 24. The second main core 40 is installed in the second cavity 38. The second main core 40 has a size corresponding to that of the first main core 26 and is provided at a position corresponding to the first main core 26. The second main core 40 cooperates with the first main core 26 to form a cavity 42 having a shape corresponding to the shape of the product M. A plurality of second core cavities (not shown) may be formed in the second main core 40, and second shape cores (not shown) may be installed in the second core cavities, respectively.

At this time, the upper surface facing the fixed side plate 20 of the second main core 40 is formed with a recess groove 40 'of the shape corresponding to the side and the lower surface of the separation board 52 to be described later. When the separation board 52 is seated in the recess groove 40 ′ of the second main core 40, the upper surface of the separation board 52 and the upper surface of the second main core 40 cooperate with each other. The lower surface of the cavity 42 facing the movable side plate 30 is formed.

An eject plate 48 and an eject pin 50 are installed in the moving space 46 formed by the spacer block 32 between the support plate 34 and the movable side plate 30. In the present embodiment, the eject plate 48 is fastened by two bolts overlapping, such as fastening bolts, the eject pin 50 is installed through one of them orthogonally. Power is transmitted to the eject plate 48 through the penetrating portion 31 of the movable side plate 30 to drive the eject plate 48. The eject pin 50 is installed through the support plate 34 and the second main core 40 and one end of the eject pin 50 is connected to the eject plate 48 and the other end of the separation board ( 52) is installed.

The separating board 52 has a plate shape of a predetermined area, and serves to separate the molded product M from the second main core 40. The separating board 52 is fastened by a tannery bolt 54 to one end of the eject pin 50. The shape of the upper surface of the separation board 52 facing the fixed side plate 20 is formed in a shape corresponding to a part of the shape of the lower surface facing the movable side plate 30 of the product (M) to be injection molded.

In addition, the cross section of the separation board 52 is preferably formed in a shape that becomes smaller as it proceeds from the upper surface of the separation board 52 to the corresponding lower surface. In other words, an inclined surface 52 ′ may be formed to be inclined downward to the side of the separation board 52. This is to allow the separation board 52 to be easily inserted into the recess groove 40 'when seated in the second main core 40.

On the other hand, the separating board 52 is connected to the eject pin (50). In order to stably support the separation board 52, three or more eject pins 50 are preferably provided. The plurality of eject pins 50 are spaced apart from each other by a predetermined distance to distribute the force supporting the separation board 52. The center of gravity of the separation board 52 and the center of gravity of the figure formed by connecting the contacts of the separation board 52 and the eject pin 50 are located approximately on a vertical line with respect to the fixed side plate 20. Position and number of the eject pin 50 can be adjusted.

Hereinafter, the operation of the product extraction device according to the present invention having the configuration as described above will be described in detail.

2 and 3 is an operational state diagram showing a process of separating the product in the mold assembly according to an embodiment of the present invention.

In the mold assembly, molten synthetic resin is supplied to the cavity 42 through the injection hole in the state shown in FIG. 1. When the synthetic resin filled in the cavity 42 is hardened to some extent, the movable side plate 30 is separated from the fixed side plate 20, and the first mold plate 22 and the second mold plate 36 are separated. Accordingly, as shown in FIG. 2, the first main core 26 is separated from the second main core 40, and a product M formed by curing the synthetic resin is attached to the second main core 40. Are exposed as a condition. In this case, the eject plate 48 is in contact with one surface of the movable side plate 30 in the moving space 46.

In this state, power is transmitted to the eject plate 48 through the through part 31 of the movable side plate 30. The eject plate 48 moves in the direction of the fixed side plate 20 in the moving space 46 as shown in FIG. 3 by the transmitted power. As the eject plate 48 moves, the eject pin 50, one end of which is connected to the eject plate 48, also moves. As the eject pin 50 moves toward the fixed side plate 20, the separation board 52 connected to the eject pin 50 also moves toward the fixed side plate 20.

As the separation board 52 moves in the direction of the fixed side plate 20, the separation board 52 protrudes from the second main core 40. Accordingly, the separation board 52 pushes the product M so that the product M is separated from the second main core 40.

At this time, when the separation board 52 starts to move, the surface on which the separation board 52 and the second main core 40 are coupled is separated and air is introduced therebetween so that the second main core 40 and the second main core 40 are separated. The vacuum state of the joining surface of the product (M) is solved and the product (M) is easily separated.

The eject plate 48 moves again in the moving space 46 as shown in FIG. 1, and the movable side plate 30 is adjacent to the driving side plate 20 so that the mold assembly is in the state of FIG. 1. As you go back, you're ready to build the next product. The product is continuously produced by repeating the process described above.

The rights of the present invention are not limited to the embodiments described above, but are defined by the claims, and those skilled in the art can make various modifications and adaptations within the scope of the claims. It is self-evident.

For example, the support plate 34 in the mold assembly is not necessarily used. In other words, the support plate 34 may be omitted depending on the shape of the second cavity 38 of the second mold 36.

In the product extraction apparatus of the mold assembly according to the present invention as described in detail above, the following effects can be obtained.

First, since the present invention is provided with a separating board, it is possible to reduce the number of eject pins, thereby facilitating the installation of the cooling line and reducing the number of parts.

In the present invention, since the pressure concentrated at the end of the eject pin is evenly distributed on the surface where the separation board and the product are in contact with each other, the impact applied to the product is alleviated, and the area for pushing the product is widened to facilitate product extraction. It also has the advantage of reducing the defective rate.

In addition, in the present invention, the separation board is provided so that the cross-sectional area that allows air to enter and exit than when only the eject pin is provided, the air is discharged when synthetic resin is injected to prevent whitening, and when the product is separated from the product As air enters between the main cores, it is prevented from becoming a vacuum state, thereby reducing damage caused by the product, thereby improving product reliability.

Claims (5)

A fixed side plate installed on the fixed side of the molding machine, A first mold plate having a first main core and installed on the fixed side plate; A movable side plate provided on the movable side of the molding machine; A second mold plate provided on the movable side plate and having a second main core selectively contacting the first mold plate and cooperating with the first main core to form a cavity corresponding to the shape of the product; At least one eject pin movably installed in a moving space formed by a spacer block provided between the movable side plate and the second mold plate; One end of the eject pin is installed orthogonal to the longitudinal direction of the eject pin, and as the eject pin is moved toward the first plate, it selectively protrudes from the second main core to take out the product and faces the movable side plate. An apparatus for extracting a product of a mold assembly comprising a plate-shaped separating board having an upper surface formed in a shape corresponding to a part of the lower surface of a product. The method of claim 1, The upper surface of the second main core facing the fixed side plate is formed with a recessed groove is wider than the bottom opening, The lower surface of the separation board facing the movable side plate is formed in a shape corresponding to the shape of the concave groove, the product taking out device of the mold assembly, characterized in that seated in the concave groove. The method of claim 1, The upper surface of the separation board facing the fixed side plate to form a part of the product assembly device, characterized in that forming a cavity for product formation. The method according to any one of claims 1 to 3, The eject pin, the product extraction device of the mold assembly, characterized in that at least three or more spaced apart from the center of gravity of the separation board is provided. The method of claim 4, wherein The separation board is a product extraction device of the mold assembly, characterized in that fastened by the eject pin and the tannery bolt.

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