KR102502455B1 - An injection molding machine - Google Patents

Abstract

The present invention provides a fixed mold plate, a movable platen capable of opening and closing the mold by relatively moving with respect to the fixed platen, a fixed mold coupled to the fixed platen and having a molten resin injection passage, and sliding on the movable platen. and a movable mold having a plurality of cavities for accommodating the resin injected along the injection passage, and by sliding the movable mold on the movable template, the injection passage is formed in one of the cavities. It relates to an injection molding machine selectively communicating with.

Description

An injection molding machine}

The present invention relates to an injection molding machine capable of greatly reducing the time required to take out a product, which takes a lot of time during the injection molding process. It relates to an injection molding machine in which a step and a step of injection molding a product can be performed simultaneously.

In general, injection molding mainly produces various types of plastic products by introducing a thermoplastic resin raw material into an injection cylinder of an injection molding machine to melt it, and then pushing the molten resin into a cavity of a metal mold by means of a hydraulic plunger or a screw of an extruder to cool and harden it. It means a manufacturing process, and the metal mold used for such injection molding is called an injection molding machine.

Specifically, the injection molding machine is a device for injecting resin into a cavity in a mold manufactured to fit the shape of a product to be molded. That is, the injection molding machine melts resin grains in a solid state by mechanical energy by rotation of a screw installed in a cylinder and thermal energy by a heater mounted outside the cylinder to form a cavity in a mold manufactured to fit the shape of a product to be molded. It is a device that obtains a product of a desired shape by injecting and solidifying molten resin in a furnace.

Korean Patent Registration No. 10-1036759 discloses an example of such an injection molding machine. An injection molding machine according to this document includes a clamping mechanism having a fixed platen and a moving platen, and an injection mechanism supplying resin to the clamping mechanism. In addition, an injection passage for guiding the movement of the resin is formed between the mold clamping mechanism and the injection mechanism.

However, the injection passage according to this document is formed as a single passage, and the single passage communicates with a single cavity formed in the clamping mechanism. That is, the resin melted in the injection mechanism may move into one cavity formed in the clamping mechanism. Therefore, there is a problem in that it is impossible to inject multiple products through one injection cycle in one injection molding machine.

In addition, after injection molding of the product is completed in the mold clamping mechanism, a process of taking out the molded product is performed. At this time, the extraction process should be performed after the mold is completely opened (mold opening), and the mold should not be closed (mold closing) until the extraction is completely completed. That is, in the prior art, there was a problem in that considerable time was required to take out the product during the entire injection molding process cycle.

Registered Patent Publication No. 10-1036759 (Announced on May 26, 2011)

The present invention is to provide an injection molding machine capable of greatly shortening the entire injection molding process time by performing injection molding of another product during a considerable time required to take out a product during the entire injection molding process time. The purpose.

In order to solve the above limitations and problems of the prior art, the present invention is a fixed platen, a movable platen capable of opening and closing the mold by relatively moving with respect to the fixed platen, coupled to the fixed platen, and an injection passage for molten resin. and a movable mold slidably installed on the movable platen and having a plurality of cavities for accommodating the resin injected along the injection passage, wherein the movable mold slides on the movable platen. , wherein the injection passage selectively communicates with one of the cavities.

According to the proposed present invention, since a plurality of cavities for manufacturing a plurality of products are formed in the moving mold, and injection molding of the product is performed independently in each cavity, it is possible to inject several products into one injection molding machine. there is

In addition, since the product is ejected from any one of the plurality of cavities and injection molding of the product is performed from another one of the plurality of cavities at the same time, the overall injection molding time of the product can be significantly reduced. there is

1 is a side view showing the overall configuration of an injection molding machine according to an embodiment of the present invention.
FIG. 2 is an enlarged front view of part A of FIG. 1 , showing the position of the movable mold relative to the movable platen in an injection waiting state.
3 is a view showing a position of a movable mold relative to a movable platen when a first product is injected.
4 is a view showing a position of a movable mold relative to a movable platen when a second product is injected.
5 is a flowchart for explaining the injection molding process of the first product and the second product.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. Although the present invention has been described with reference to the embodiments shown in the drawings, this is to be described as one embodiment, whereby the technical idea of the present invention and its core configuration and operation are not limited.

1 is a side view showing the overall configuration of an injection molding machine according to an embodiment of the present invention.

Referring to FIG. 1 , an injection molding machine 1 according to an embodiment of the present invention includes an injection device 10 and a mold clamping device 20 .

The injection device 10 includes a cylinder 11, and a hopper 12, which is an inlet passage for solid resin, is installed in the cylinder 11. Inside the cylinder 11, a screw 13 is installed forward and backward or rotatably. The rear end of the screw 13 is rotatably supported by power transmission of the belt pulley through the metering motor 15 mounted on the support member 14.

In addition, the injection device 10 has a screw shaft 17 disposed parallel to the screw 13. The rear end of the screw shaft 17 is connected to the output shaft of the injection motor 19 by a timing belt. Thus, the screw shaft 17 can be rotated by the injection motor 19 . The front end of the screw shaft 17 is engaged with a nut fixed to the support member 14. Accordingly, when the screw shaft 17 is rotated through the timing belt, the support member 14 moves forward or backward, and as a result, forward and backward movement of the screw 13 is possible.

The mold clamping device 20 has a fixed platen 24 and a movable platen 22 movable in the forward and backward directions relative to the fixed platen 24 so as to close or open the mold. A fixed mold 200 and a movable mold 100 are mounted on the fixed mold plate 24 and the movable mold plate 22, respectively. Here, the fixed mold 200 and the moving mold 100 may collectively be referred to as the mold 50 . In addition, the movable mold 100 and the fixed mold 200 are fastened/combined with each other to form a resin injection unit 90 as a molding space corresponding to a molded article in the mold 50 .

The movable platen 22 and the fixed platen 24 are connected by a tie bar 29. The movable platen 22 is capable of sliding or translational movement along the tie bars 29 .

In addition, the clamping device 20 has a toggle mechanism 27 connected to the movable platen 22. A rear platen 26 for holding the position of the toggle mechanism 27 is formed at the rear end of the toggle mechanism 27 . The toggle mechanism 27 has a plurality of links, and mold closing or opening of the mold 50 can be performed according to mutual movement between the plurality of links.

In the clamping device 20, when the clamping motor 25 as a driving unit is driven, the rotation of the clamping motor 25 is transmitted to the ball screw shaft through the timing belt. Then, the rotational motion is converted into linear motion by the ball screw shaft and nut, and the toggle mechanism 27 operates. In addition, by the operation of the toggle mechanism 27, the movable platen 22 moves along the tie bar 29, and mold closing and mold opening operations with the fixed platen 24 are performed.

Between the injection device 10 and the mold clamping device 20, an injection passage 80 providing a movement path for resin is installed. Specifically, the solid resin moved into the cylinder 11 through the hopper 12 is melted by the forward movement of the screw 13 and heating in the cylinder 11 . The melted resin is accumulated at the front end of the screw 13, injected through the injection passage 80, and moved to the mold 50 of the clamping mechanism 20, specifically, the resin injection part 90.

A plurality of resin injection units 90 may be installed in the movable mold 100 . Hereinafter, the structure of the movable mold 100 will be described in detail.

FIG. 2 is an enlarged front view of part A of FIG. 1 , showing the position of the movable mold relative to the movable platen in an injection standby state.

Referring to FIG. 2 , the movable mold 100 is configured to be movable in the left and right directions with respect to the movable platen 22 . That is, a guide part 52 for guiding left and right movement of the movable mold 100 with respect to the movable mold 22 may be installed at the bottom of the movable mold 100 . For example, the guide part 52 may have a rack-pinion structure. Specifically, the guide part 52 is formed in a rack structure, and a pinion structure engaged with the rack is formed in the main body 110 . That is, the movable mold 100 can be moved to a desired position by moving the pinion in a state in which the rack and the pinion are engaged with each other by the power provided from the drive unit 51 . As another example, the guide part 52 may be a rail. That is, the movable mold 100 can be moved to a desired position by the power provided from the drive unit 51 installed on one side of the rail.

A mold support part 53 for supporting the movable mold 100 is installed below the guide part 52 . That is, the mold support part 53 supports the lower surface of the movable mold 100 to prevent the movable platen 22 from sagging due to the load of the movable mold 100 .

In addition, a tie bar insertion hole for guiding forward and backward movement of the movable platen 22 with respect to the fixed platen 24 is formed in the mold support part 53 . For example, two tie bars 29 may be installed on the top and bottom, respectively, and the tie bar insertion hole may be configured such that two tie bars installed on the bottom pass through. That is, since the mold support part 53 where the tie bar insertion hole is formed is made of a structure that can move together with the movable platen 22 along the tie bar 29, when the mold is closed or opened, the fixed platen The movement of the movable template 22 relative to 24 can be made easily. According to this configuration, the movable platen 22 is connected to the fixed platen 24 by a tie bar 29 extending in the forward and backward directions, so that it can move in the forward and backward directions with respect to the fixed platen 24, The movable mold 100 is connected to each other by the movable platen 22 and the guide part 52 extending in the left and right directions perpendicular to the front and rear directions, so that the movable mold 100 can move in the left and right directions with respect to the movable platen 22. .

However, the left-right movement of the movable mold 100 may be limited by a wedge formed on the front surface of the movable mold plate 100 and a wedge insertion hole formed on the rear surface of the movable mold 100 . That is, since the wedge is accommodated in the wedge insertion hole, movement of the movable mold 100 relative to the movable platen 22 in the left and right directions can be restricted. For example, one wedge insertion hole may be installed on the left and right sides of the rear surface of the movable mold 100, respectively.

Specifically, in an injection waiting state, that is, when the movable mold 100 is positioned at the center of the movable mold plate 22, the wedge is pressed by the main body of the movable mold 100. In this state, when the leftward movement of the movable mold 100 is completed, the wedge is inserted into the wedge insertion hole (right insertion hole) formed in the movable mold 100, thereby further moving the movable mold 100 to the left this is limited Similarly, when the rightward movement of the movable mold 100 is completed, the wedge is inserted into the wedge insertion hole (left insertion hole) formed in the movable mold 100, thereby further moving the movable mold 100 to the right this is limited Accordingly, after the horizontal direction movement of the movable mold 100 is completed, the position of the movable mold 100 may be fixed. A cylinder control method may be used as a method for inserting the wedge into the wedge insertion hole.

In addition, in this embodiment, it has been described that a wedge is installed in the movable platen 100 and a wedge insertion hole is formed in the movable mold 100, but a wedge insertion hole is formed in the movable platen 100, It is also possible that a wedge is installed in the movable mold 100 . In addition, as a configuration for fixing the position of the movable mold 100, other parts other than the wedge may be used.

In addition, the movable mold 100 includes a body 110 and a first cavity 111 and a second cavity 112 formed in the body 110 . A first resin injection part 91 and a second resin injection part 92 communicating with the injection passage 80 are formed in each of the first cavity 111 and the second cavity 112 . That is, the resin in the cylinder 11 is selectively moved to the resin injection parts 91 and 92 along the injection passage 80 so that plastic products and the like can be molded.

As described above, according to the present invention, a plurality of cavities 111 and 112 in which a plurality of resin injection parts 91 and 92 are respectively formed are installed in the movable mold 100, and injection molding of a product is performed independently in each cavity. Since it is made, there is an advantage that it is possible to inject several products from one injection molding machine.

However, the type of resin injection parts 91 and 92 communicating with the injection passage 80 is changed by the movement of the movable mold 100 relative to the movable platen 22 in the left and right directions. For example, FIG. 3 is a view showing the position of the movable mold relative to the movable platen when a first product is injected, and FIG. 4 is a view showing the position of the movable mold relative to the movable platen when a second product is injected.

Referring to the drawings, the injection molding machine according to the present invention further includes a control unit for controlling the movement direction, movement time or movement distance of the movable mold 100 with respect to the movable platen 22 . If, at the same time as the second product is injection-molded in the second cavity 112, a signal to take out the first product for which the injection is completed is transmitted from the first cavity 111, the control unit controls the second cavity 112 communicates with the injection passage 80 to control the molten resin in the cylinder 11 to move to the second resin injection part 92 of the second cavity 112 along the injection passage 80. That is, the control unit operates the guide unit 52 to position the second cavity 112 at the center of the movable platen 22 . Accordingly, a portion of the first cavity 111 protrudes outward from the movable platen 22 to reach a position where products can be taken out (see FIG. 3).

Specifically, the resin injected into the first resin injection unit 91 of the first cavity 111 goes through a cooling process to become a solid product (first product). Then, the solid first product may be taken out as one molded product by the gripper 120 . The gripper 120 is composed of a support rod 121 that can be extended in the vertical direction and a tongs 122 positioned at an end of the support rod 121 to directly grip a product. That is, in the gripper 120 , the first product may be taken out by the tongs 122 gripping the first product based on the vertical extension operation of the support bar 121 . At this time, in the second cavity 112 , the injection molding operation of the second product is performed by the resin provided from the injection passage 80 .

However, it should be noted that a device or process for taking out a product to the outside is not limited thereto, and various examples may be applied. In addition, in this embodiment, the gripper 120 is illustrated as being rotatably fixed to the top of the movable platen 22, but the position and operation method of the gripper 120 are not limited thereto either.

When the process shown in FIG. 3, that is, the process of taking out the first product from the first cavity and injection molding the second product from the second cavity is finished, the control unit transmits a driving signal to the guide part 52 to move the mold. (100) is moved as shown in FIG. That is, the control unit operates the guide unit 52 to position the first cavity 111 at the center of the movable platen 22 . Accordingly, a portion of the second cavity 112 protrudes to the outside of the movable platen 22 to reach a position where the product can be taken out, and the first resin injection part 91 of the first cavity 111 ) is in communication with the injection passage 80.

Specifically, the resin injected into the second resin injection unit 92 of the second cavity 112 goes through a cooling process to become a solid product (second product). Then, the solid second product may be taken out as a product by the gripper 120 . That is, in the gripper 120 , the second product can be taken out as the tongs 122 grip the second product based on the vertical extension operation of the support bar 121 . At this time, in the first cavity 111, an injection molding operation of one product is performed by the resin provided from the injection passage 80.

Hereinafter, a process in which the injection molding of the first product and the second product is performed will be described in detail.

Figure 5 is a flow chart explaining the injection molding process of the first product and the second product.

First, when an injection molding signal for the first product is transmitted, the control unit operates the guide part 52 to move the first cavity 111 to an injection standby position, that is, move the first cavity 111 to the moving platen. It is controlled to be located in the central part of (22) (S10). Then, the movable platen 22 moves with respect to the fixed platen 24, and as sealing (or contact) between the molds mounted on each platen is made, the injection operation starts, and after the start of the injection operation, the pressure is increased. This is done (S11).

When this mold closing operation is performed, the injection passage 80 communicates with the first resin injection port 91 of the first cavity 111 . That is, the molten resin disposed at the front end of the screw 13 moves along the injection passage 80 and moves to the first resin injection port 91 . At this time, the screw 13 is moved forward so that injection molding of the first product in the first cavity 111 is performed (S12).

In the injection molding of the first product, as the screw 130 advances, the molten resin enters the empty space (first resin injection part 91) in the first cavity 111 through the sprue, the runner, and the gate. This refers to a step in which a filling process and a packing process for supplementing the pressure in the first resin injection unit 91 are performed.

The resin introduced into the first resin injection unit 91 through the injection molding process is cooled so that the first product can be taken out without significant deformation in the first resin injection unit 91 (S13). . The cooling in step S13 may be, for example, cooling under a set set condition, or, for another example, natural cooling, which is a cooling method at room temperature. It is preferable to minimize the cooling time so that the molten resin is uniformly distributed in the first resin injection unit 91 . And, in the step S13, the measurement of the second product is performed together with the cooling of the first product. That is, in the step S13, resin plasticization work (metering) for the second product for the next injection is performed together.

When the cooling of the first product is completed, the mold is opened. At this time, a solid first product is molded in the opened mold, specifically, in the first resin injection unit 91 . Accordingly, the control unit operates the guide unit 52 to control the second cavity 112 to an injection stand-by position, that is, to position the second cavity 112 at the central portion of the movable platen 22. (S14). Accordingly, the first cavity 111 is placed at a product take-out position.

Then, the movable platen 22 moves with respect to the fixed platen 24, and as sealing (or contact) between the molds mounted on each platen is made, the injection operation starts, and after the start of the injection operation, the pressure is increased. This is done (S15).

When the mold closing operation is performed, the injection passage 80 communicates with the second resin injection port 92 of the second cavity 112 . That is, the molten resin disposed at the front end of the screw 13 moves along the injection passage 80 and moves to the second resin injection hole 92 . At this time, the screw 13 is moved forward so that injection molding of the second product in the second cavity 112 is performed (S16). At the same time, in the step S16, the operation of taking out the first product placed in the first resin injection unit 91 is also performed. That is, the control unit manufactures the second product by injecting molten resin into the second resin injection port 92 and at the same time, in the first resin injection unit 91 through a take-out robot such as the gripper 120. It controls to take out the 1st product to the outside.

The resin introduced into the second resin injection unit 92 through the injection molding process is cooled so that the second product can be taken out without significant deformation in the second resin injection unit 92 (S17). . And, in the step S17, the metering of the first product is performed together with the cooling of the second product. That is, in the step S17, resin plasticization work (measuring) for the first product for the next injection is performed together.

When the cooling of the second product is completed, the mold is opened and the position of the movable mold 100 is changed (S18). If the control unit sends a signal to continue the injection molding operation of the product, the steps below S10 are performed again, and when the control unit sends a signal to end the operation, the guide unit 52 is moved to the center of the moving mold 100. The movable mold 100 is moved to the injection end position so that the movable mold 100 is disposed at the center of the movable platen 22 (S20). However, when the control unit transmits a signal to continue the injection molding operation of the product and the steps below S10 are performed again, the injection molding process of the first product and the taking-out process of the second product are performed at the same time in the step S12. It can be.

In this way, according to the present invention, since the product is taken out of any one of the plurality of cavities and injection molding of the product is performed in another one of the plurality of cavities at the same time, the total injection time of the product is greatly reduced. There are advantages to shortening.

The above description is merely an example of the technical idea of the present invention, and various modifications and variations can be made to those skilled in the art without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are not intended to limit the technical idea of the present invention, but to explain, and the scope of the technical idea of the present invention is not limited by these embodiments. The protection scope of the present invention is interpreted by the following claims, and all technical ideas within the equivalent range should be construed as being included in the scope of the present invention.

1: injection molding machine 10: injection device
20: clamping device 22: moving platen
24: fixed platen 51: driving unit
52: guide part 53: mold support part
80: injection passage 90: resin injection part
100: moving mold 111: first cavity
112: second cavity 200: fixed mold

Claims (7)

fixed template;
a movable platen capable of opening and closing the mold by relatively moving with respect to the fixed platen;
a fixed mold coupled to the fixed template and having a molten resin injection passage;
a movable mold slidably installed on the movable platen, provided with a plurality of cavities for accommodating the resin injected along the injection passage, and configured to be movable in left and right directions; and
And a guide part disposed under the movable mold to guide movement of the movable mold in the left and right directions,
As the movable mold slides in the left and right directions on the movable platen, the injection passage selectively communicates with one of the cavities,
A wedge is formed on the front surface of the movable platen to limit the movement of the movable mold in the left and right directions relative to the movable platen,
A wedge insertion hole is formed on the rear surface of the moving mold to accommodate the wedge,
A mold support is installed at the bottom of the movable mold to prevent the movable platen from sagging due to the load of the movable mold,
A tie bar insertion hole through which a tie bar for guiding forward and backward movement of the movable platen with respect to the fixed platen is formed in the mold support part,
The injection molding machine, characterized in that the mold support moves together with the moving platen.
delete According to claim 1,
The injection molding machine, characterized in that the guide unit guides the left-right movement of the movable mold relative to the movable platen by power transmitted from a driving unit installed on one side of the guide unit.
According to claim 1,
The moving mold,
An injection molding machine comprising a main body and a first cavity and a second cavity formed in the main body and having a first resin injection part and a second resin import part formed therein, respectively.
According to claim 4,
Further comprising a control unit for controlling the relative movement of the movable mold with respect to the movable template,
The control unit controls the first resin injection part of the first cavity and the injection passage to communicate with each other during injection molding of the first product in the first cavity, and injection molding of the second product in the second cavity. The injection molding machine, characterized in that controlled so that the second resin injection part of the second cavity and the injection passage communicate with each other.
According to claim 5,
The control unit controls injection molding of the first product from the first cavity and the second product from the second cavity to be performed simultaneously, or the second product from the second cavity and the first product from the first cavity. An injection molding machine characterized in that for controlling the injection molding to be performed at the same time.
delete

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