KR101197119B1 - 2-Cavity mold for large size frame for injection molding - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for injection molding a large internal frame into a large cavity, such as 32 "or 40", into a mold having two cavities.

The present invention implements a new type of injection molding method in which a product is formed by using a mold having a structure having two cavities arranged side by side in the same direction in one mold, thereby simplifying the overall structure and reducing the scale. The product quality can be greatly reduced, the productivity can be improved by shortening the cycle time, and the product can be molded to the exact shape without any deviation between the cavities, and the selective assembly of the mold part and the hot runner part can be performed. It is possible to select and operate two cavities provided in the mold appropriately by using a structure that can be used. Therefore, a two-cavity mold device for manufacturing a large frame that can efficiently operate an injection facility, such as actively coping with an increase or decrease of quantity, to provide.

TV, Frame, Injection Molding, Mold, 2-Cavity, Hot Runner

Description

2-Cavity Mold for Large Size Frame for Injection Molding

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a two-cavity mold apparatus for manufacturing large frames, and more particularly, to an apparatus for injection molding a large internal frame into a large cavity such as 32 "or 40" into a mold having two cavities.

Generally, a type of display device is, as is known, a color cathode ray tube (CRT), a liquid crystal display (LCD), a fluorescent display (VFD), a plasma display device (PDP) and the like.

Among them, the liquid crystal display is a device for displaying information by using the electrical and optical properties of the liquid crystal material injected into the liquid crystal display panel. Recently, a portable video camera and a digital camera are used as monitors and image display devices of televisions and computers. Increasingly, applied fields such as automobile navigation devices, various information devices, and communication devices are gradually expanding.

Such a liquid crystal display device includes components such as a liquid crystal display panel, a printed circuit board, a flexible circuit board, a backlight assembly, and the like, which are housed in a case for protection and fixation from external impact, and the bottom of the case The components of the backlight assembly are sequentially received, and the LCD panel assembly is received thereon.

In addition, a liquid crystal display device such as a screen of a TV includes a built-in frame coupled to the case to prevent the display panel assembly simply seated on the case from being separated out.

The built-in frame is installed to support the outside of the display panel assembly and is manufactured in the form of a plastic molded article through an injection molding process.

Large injection molded parts, such as the built-in frame, which are usually applied to large TVs such as 32 "or 40", have a single cavity because they have to consider various difficult molding conditions such as resin flowability compared to ordinary small injection molded parts. It is common to stamp out products one by one using a mold.

However, this molding method has a limitation in shortening the cycle time.

That is, it is difficult to shorten the entire cycle time due to the absolute time required for the resin weighing time.

In order to solve this disadvantage, recently, a method of injecting a resin into two cavities at the same time, for example, a method of molding a product using a tandem mold or a stack mold has been proposed.

Among them, a method of forming a product using a stack mold is as follows.

The stack mold is a kind of precision mold which is composed of a plurality of mold mechanisms and ejects to both sides. Each ejection plate is provided to continuously produce the injection molding.

Therefore, in order to take out the injection molding, the cam mechanism and the cylinder may be operated to open the mold, and the injection molding molded by the upper and lower discs may be taken out through the extraction plate. The resin can be injected between the upper and lower discs.

Such a stack mold system has an advantage of molding more products than a one-way injection molding machine, but has several disadvantages as follows.

First, not only the structure of the mold is very complicated, but also the extension nozzles are separated and contacted, which causes leakage of the resin and requires countermeasures.

Second, there is a disadvantage that the failure rate is high due to the deviation of the upper and lower products.

Third, the overall thickness of the mold becomes thick, which has the disadvantage of increasing the specification or size of the injection machine.

Fourth, since one side is supplied in the forward direction, the other side in the reverse direction when the resin is injected into each cavity, there is a disadvantage that the shape of the product does not come out the same because the action of the injection pressure is uneven.

Accordingly, the present invention has been made in view of the above, and implements a new type of injection molding method for molding a product by using a mold having a structure having two cavities arranged side by side in the same direction in one mold. By this, the overall structure can be simplified and the scale can be greatly reduced, productivity can be improved by shortening the cycle time, and the quality of the product can be improved, such as molding into an accurate shape without occurrence of deviation between cavities. It is an object of the present invention to provide a two-cavity mold apparatus for manufacturing a large frame.

In addition, the present invention can selectively operate the two cavities provided in the mold by using the selectively assembleable structure of the mold part and the hot runner part, so that it is possible to actively cope with the increase or decrease of the quantity. The object is to provide a two-cavity molder for the manufacture of large frames that can be operated efficiently.

In order to achieve the above object, the 2-cavity mold apparatus for manufacturing a large frame provided by the present invention has a structure including a mold part for molding a resin and a hot runner part for injection of a resin, wherein the mold part has one side. Two cavities are arranged side by side up and down in the same direction, and the hot runner part has a main resin passage through which the resin supplied from the injection machine flows and two branches branching from the main resin passage toward each cavity. By providing a sub resin passage, it is possible to simultaneously injection mold two large frame products, such as 32 "or 40", in one injection, while maintaining the flow of resin directed to each cavity in the same direction.

Here, the hot runner part is provided with a main block to which the main resin passage belongs and a sub block to which the sub resin passage belongs, and by combining the two blocks into an assemblable structure, separating the main block if necessary according to the quantity change. After that, it is preferable to efficiently supply the injection machine side resin through one of the sub resin passages of the sub block so that only one of the two cavities can be operated to perform injection molding of the product.

In addition, the two-cavity mold apparatus for manufacturing a large frame provided by the present invention has a feature capable of injection by applying a 900 ton Engel injection machine, which is an existing injection equipment, without additional equipment investment.

The 2-cavity mold apparatus for manufacturing a large frame provided by the present invention has the following advantages.

First, by applying a two-cavity mold having a structure in which two cavities are arranged side by side in one direction in the mold, the cycle time can be shortened, and thus productivity can be improved.

Second, there is an advantage that the structure of the mold is simple and can be greatly reduced in size.

Third, since the direction of the resin injected into each cavity is the same, it is possible to mold the product into an accurate shape, such as to eliminate the deviation between the cavities, there is an advantage that can improve the quality of the product.

Fourth, existing equipment, for example, 900 ton Engel injection machine can be used, it is possible to reduce the investment cost of injection equipment according to the increase in volume.

Fifth, the selective combination of the mold part and the hot runner part is possible, so that it is possible to actively respond to increase in quantity or decrease in quantity, such as selectively using either two cavities in the mold or both. Therefore, there is an effect that can efficiently operate the injection ratio.

Sixth, since two products having different shapes can be formed at the same time by different two cavity shapes provided in the mold, it is possible to secure a variety of product molding.

Therefore, in the present invention, two sets of molds can be simultaneously injected in one injection molding machine by using a 900-ton injection facility, which is maintained through the production of two-cavity molds when forming a large frame such as 32 ". Time can be shortened.

As a result, it is possible to curb injection equipment investment due to increased volume and to shorten the shortest cycle time of the current 32 "mold from 14 seconds to 23 seconds.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

1 is a side cross-sectional view showing a two-cavity mold apparatus for manufacturing a large frame according to an embodiment of the present invention, Figure 2 is a cavity arrangement relationship in a mold in a two-cavity mold apparatus for manufacturing a large frame according to an embodiment of the present invention It is a front view which shows.

As shown in FIG. 1 and FIG. 2, the two-cavity mold apparatus for manufacturing a large frame can increase the efficiency of injection equipment by maximizing injection technology convergence, and build a foundation for improving productivity. That provides the benefits.

To this end, the two-cavity mold apparatus for manufacturing a large frame includes two parts, that is, a mold part 10 for molding a resin into a predetermined shape using a cavity, and a molten resin supplied from an injection machine side to a mold part 10. It includes a hot runner part 11 to be injected into.

The mold part 10 includes two cavities 12a and 12b, for example, molds 17a and 17b which can be opened and closed at the top and the bottom thereof, respectively, arranged side by side, and each mold 17a. 17b is provided with each cavity 12a, 12b of a product shape.

In particular, the two cavities 12a and 12b are all provided in the same orientation, so that the resin flowing into each of the cavities 12a and 12b also proceeds in the same direction at the same time and then immediately into the cavity 12a. ), 12b is filled.

The flow characteristics of the resins associated with these two cavities 12a and 12b allow the molding of products of the same shape without variation between cavities while solving the resin fluidity problem that is most problematic when manufacturing two large frames simultaneously. Provide an advantage.

That is, the two cavities 12a and 12b provided in the mold part 10 are arranged in the same direction toward the mold front side, and the two cavities 12a and 12b arranged in this way face each other. By simultaneously injecting resin in the same direction, it is possible to mold a precisely shaped product when forming a large frame product through two cavities in one mold, for example, a large frame product of 32 "or larger.

Here, the two cavities 12a and 12b provided in the mold part 10 may be formed in the same cavity shape, or may be formed in different cavity shapes, and thus two products having the same shape. Can be injection molded simultaneously, or two products of different shapes can be injection molded at the same time.

The hot runner part 11 serves as a passage for injecting the resin supplied from the injection machine side into the cavities 12a and 12b of the molds 17a and 17b of the mold part 10. to be.

The hot runner part 11 is formed in one assembly form in which the main block 15 and the sub block 16 which can be disassembled and combined with each other are combined, and the assembly is coupled to the front surface of the mold part 10. The two-cavity mold apparatus for manufacturing a large frame is completed.

A plurality of nozzles 18 are interposed between the hot runner part 11 and the mold part 10, and the nozzle tip of the nozzle 18 at this time is the resin passage side of the hot runner part 11 and the nozzle rear end. The silver communicates with the cavity side of the mold part 10, so that the resin flowing from the resin passage side can be filled in the cavity side through the nozzle.

The resin passages for inducing the flow of molten resin are formed in the main resin passage 13 and the sub block 16 formed in the main block 15 and two subs assigned to each cavity 12a and 12b. Resin passages 14a and 14b, wherein the main resin passages 13 and the sub resin passages 14a and 14b are connected to each other by the respective resin inlets 19a and 19b. .

In addition, the resin inlet 19c is also provided in the main resin passage 13 of the main block 15 so as to be connected to the injection machine side.

As a result, the resin supplied from the injection machine side flows through the main resin passage 13, and subsequently branches to the two sub resin passages 14a and 14b, and then into each cavity 12a and 12b. Will be filled.

In addition, the present invention provides a resin injecting form that can improve the accuracy of the shape by injecting the resin into the two cavities (12a, 12b) in a balanced manner.

To this end, as can be seen in Figure 2, the sub-resin passage 14a, 14b provided in the sub-block 16 is provided with a set of ten, respectively, the ten sub-resin passage 14a, 14b are positioned three on the long side and two on the short side, and are equally arranged at regular intervals along the cavity section in which the product is molded.

Accordingly, the molten resin introduced through the resin inlets 19a and 19b is evenly distributed to the ten sub resin passages 14a and 14b, and then through the nozzles 18a and 12a, respectively. It is possible to form the product accurately by being injected in a balanced manner over the entire section of 12b).

Of course, the number of sub resin passages (10) at this time is a preferable quantity when manufacturing a 32 "large frame, and when the size of a large frame becomes larger, for example, when manufacturing a 40" large frame, the number of sub resin passages Can be increased accordingly.

Therefore, look at the state of use of the two-cavity mold apparatus for manufacturing a large frame is configured as follows.

Figure 3 is a side cross-sectional view showing the operating state of the two-cavity in the two-cavity mold apparatus for manufacturing a large frame according to an embodiment of the present invention.

As shown in FIG. 3, the molten resin 100 supplied from the injection machine side enters the main resin passage 13 of the main block 15 through the injection connector connector 20 and the resin inlet port 19c of the mold apparatus. Subsequently, the molten resin is branched up and down, and then enters the sub resin passages 14a and 14b through the resin inlets 19a and 19b of the sub block 16.

That is, the resin provided from the injection machine is guided in the same traveling direction along the main resin passage 13 and the sub resin passages 14a and 14b.

In other words, two stems of resin directed to the upper and lower cavities 12a and 12b are injected simultaneously into the respective cavities 12a and 12b after proceeding in the same direction without bending in the reverse direction.

Subsequently, the resin introduced into the sub resin passages 14a and 14b is filled in the respective cavities 12a and 12b provided in the molds 17a and 17b through the nozzles 18, As a result, it is possible to simultaneously mold two products having the correct shape in one injection.

Here, the injection machine can be applied to 900 ton Engel injection machine existing injection equipment without additional investment.

On the other hand, the present invention provides a method that can be produced by operating only one of the two cavities according to the quantity of large frame products.

That is, when the quantity is large, by operating both of the two cavity as described above, and when the quantity is small by operating only one cavity, as shown below, it provides the advantage that the injection equipment can be efficiently operated.

Figure 4 is a side cross-sectional view showing the operating state of the 1-cavity in the two-cavity mold apparatus for manufacturing a large frame according to an embodiment of the present invention.

As shown in FIG. 4, after the main block 15 is separated in the assembly form of the hot runner part 11 and the malt part 10 including the main block 15 and the sub block 16, the sub block is separated. Injection molding machine connector 20 for connection with the main resin injection machine side to the resin injection port 19a of the sub resin passage 14a belonging to one of the sub resin passages, for example, the upper cavity 12a in (16). Install it.

Therefore, the molten resin 100 supplied from the injection machine side enters directly into the sub resin passage 14a through the injection connector connector 20 and the resin inlet port 19a, and then the resin entering the sub resin passage 14a is Since each of the nozzles 18 is filled in the cavity 12a provided in the upper mold 17a, only the cavity of any one of the two cavities can be operated to form the product.

That is, unlike the tandem mold or the stack mold, which was not possible to produce a single product for the previous product, the two-cavity mold method of the present invention simply dismantles only the main block 13 of the hot runner part 11 and then the sub block. Injection molding of one product is possible by directly injecting resin through one sub resin passage (14a) of (16), so that injection equipment can be operated efficiently, such as actively responding to changes in quantity. There is an advantage.

5 is a photograph of a mold having a 2-cavity in a two-cavity mold apparatus for manufacturing a large frame according to an embodiment of the present invention.

As shown in Fig. 5, one mold part shows two cavities taking the same direction, that is, a cavity for forming a 32 "large internal frame.

By applying this two-cavity mold, even if the volume increases, the effect of two injection molding machines can be created without equipment investment, and the cost saving effect is about 10% compared to the cost of manufacturing two single cavity molds in relation to the mold manufacturing cost. You can get it.

For example, a 32 "single-cavity mold will cost $ 98,000,000 × 2 units = $ 196,000,000, while a 32" 2-cavity mold will cost $ 176,000,000. Can be reduced.

6 is a cycle time chart analyzing the effect of using a two-cavity mold apparatus for manufacturing a large frame according to an embodiment of the present invention.

As shown in FIG. 6, using a 900 ton injection facility, which is basically possessed through the manufacture of 32 "two-cavity mold, two sets of molds can be simultaneously injected in one injection machine, thereby reducing the time for each molding process. This is possible.

Therefore, it is possible to suppress the investment in injection equipment according to the increase in quantity and to shorten the shortest cycle time of the current 32 "middle mold from 14 seconds to 23 seconds by 23 seconds.

7 is a table and a graph analyzing the effect of using a two-cavity mold apparatus for manufacturing a large frame according to an embodiment of the present invention.

As shown in FIG. 7, an improvement rate of about 35% can be obtained when the cycle is shortened, and an improvement rate of about 64% can be obtained when the productivity is improved.

In the above, certain preferred embodiments according to the present invention have been illustrated and described. However, the present invention is not limited to the above-described embodiments, and a person of ordinary skill in the art may vary without departing from the spirit of the technical idea of the present invention described in the claims below. It will be possible to carry out the change.

1 is a side cross-sectional view showing a two-cavity mold apparatus for manufacturing a large frame according to an embodiment of the present invention.

Figure 2 is a front view showing the cavity arrangement relationship in the mold in a two-cavity mold apparatus for manufacturing a large frame according to an embodiment of the present invention

Figure 3 is a side cross-sectional view showing the operating state of the two-cavity in a two-cavity mold apparatus for manufacturing a large frame according to an embodiment of the present invention.

Figure 4 is a side cross-sectional view showing the operating state of the 1-cavity in the two-cavity mold apparatus for manufacturing a large frame according to an embodiment of the present invention.

5 is a photograph of a mold having a 2-cavity in a 2-cavity mold apparatus for manufacturing a large frame according to an embodiment of the present invention.

6 is a cycle time chart analyzing the effect of using a two-cavity mold apparatus for manufacturing a large frame according to an embodiment of the present invention

Figure 7 is a table and graph analyzing the effect when using a two-cavity mold apparatus for manufacturing a large frame according to an embodiment of the present invention

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

10: mold part 11: hot runner parts

12a, 12b: Cavity 13: Main resin passage

14a, 14b: Sub resin passage 15: Main block

16 subblock 17a, 17b mold

18: nozzles 19a, 19b, 19c: resin inlet

20: Injection molding machine connector

Claims (5)

A mold part 10 for molding a resin and a hot runner part 11 for injecting a resin, wherein the mold part 10 has two cavities oriented in the same direction while being arranged up and down side by side on one side. 12a, 12b are provided, and the hot runner part 11 is branched from the main resin passage 13 through which the resin supplied from the injection machine side flows, and from the main resin passage 13 to each cavity 12a. And two sub resin passages 14a and 14b directed toward 12b, and the main resin passage 13 and each of the sub resin passages 14a and 14b have an injection machine for connection with the main resin injection machine side. The connector 20 is connected to each other by the respective resin inlets 19a and 19b, which may be installed, so that the resin flows toward the respective cavities 12a and 12b in the same direction while being 32 "in one injection. Two or more large frame products can be injection molded at the same time, The hot runner part 11 includes a main block 15 to which the main resin passage 13 belongs, and a sub block 16 to which the sub resin passages 14a and 14b belong. In the main resin passage (13) of the resin is provided with a resin inlet (19c) connected to the injection machine side, the main block 15 and the sub block 16 is combined in a structure that can be disassembled and combined with each other, After the block 15 is separated, the injection machine connector 20 is installed in the resin injection port 19a of any one sub resin passage 14a of the sub block 16 to directly supply the injection machine side resin, thereby making it possible to It is possible to injection molding the product by operating only one, The sub resin passages 14a and 14b which are provided in the hot runner part 11 and belong to each cavity 12a and 12b are arranged evenly at regular intervals while going along the cavity section in which the product is molded. A two-cavity mold apparatus for manufacturing a large frame, characterized in that the resin is made of one set so that the resin can be injected in a balanced manner throughout the entire cavity. delete The method of claim 1, wherein the two cavity (12a, 12b) in the mold part 10 is made of a different cavity shape for forming a large frame, characterized in that the injection molding of two products of different shapes 2-cavity mold apparatus. delete The injection molding machine using the mold part 10 having the two cavities 12a and 12b is capable of applying a 900 ton Engel injection machine, which is an existing injection facility. 2-cavity mold apparatus for large frame manufacturing.

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