KR101244186B1 - An assembly of nozzle and manifold block of hot runner system - Google Patents

Abstract

The present invention relates to a nozzle and manifold block assembly in which a nozzle and a manifold block are assembled in a hot runner system of an injection molding die.
Nozzle and manifold block assembly according to an aspect of the present invention, the manifold block including a heater and a resin passage therein; A nozzle plate having a plurality of runners formed at an upper portion thereof and a plurality of nozzles formed at a lower portion of each of the runners; And a core plate formed with nozzle seats on which nozzles of the nozzle plate are seated, wherein the manifold block, the nozzle plate, and the core plate are fixed and fastened by fastening bolts. Inside the nozzles are formed resin injection passages in communication with each other, the resin injection passages are in communication with the runners, and molten resin is injected into the respective cavities in which the product is molded through the runners and the resin injection passages, It is ideally suited for forming large quantities of tiny products at once. The resin injection passages inside the nozzles and the resin injection holes of the nozzle sheets may be arranged concentrically with each other, or may be disposed eccentrically with each other. In addition, the nozzle and manifold block assembly according to another aspect of the present invention, the manifold block including a heater and a resin passage therein; And a nozzle core plate having a plurality of runners formed at an upper portion thereof, and a plurality of resin injection passages formed at each lower portion of the runners, wherein the manifold block and the nozzle core plate are fixedly fastened by fastening bolts. The resin injection passages formed inside the core plate are in communication with the runners so that molten resin is injected through the runners and the resin injection passages into each cavity in which the product is molded, and is suitable for forming a large amount of ultra-small products at once. It is.

Description

NO ASSEMBLY OF NOZZLE AND MANIFOLD BLOCK OF HOT RUNNER SYSTEM}

The present invention relates to a hot runner system of an injection mold, and more particularly, to a nozzle and manifold block assembly in which the nozzles and the manifold block of the hot runner system are assembled.

In the case of a cold runner system in injection molding, the molten resin in the runner portion, which is the flow path of the molten resin in the mold, is cooled and solidified together with the molten resin in the cavity for forming the mold product. Taken out together, the runner portion is removed from the blown molded product and the removed runner portion is recycled again. This may result in waste of the resin and increases in the number and time of production processes. In contrast, the hot runner system is a system in which the molten resin of the runner portion is heated to about 200 ° C. to 400 ° C. by using electricity or steam to maintain the molten state at all times. As a result, productivity and ease of production automation, and the product has the advantages of improving the quality of the situation is a lot of research and development.

1 shows a conventional hot runner system as described above. Briefly, a clamping plate 1 is installed at an upper portion thereof, and a spacer plate 2 is disposed at a lower portion thereof. The holding plate 3 and the cavity plate 4 are sequentially installed, and the manifold block 5 is installed in the space between the clamping plate 1 and the holding plate 3. And all of them are fixed and fastened by a fastening bolt or the like to form a fixed side mold. In addition, nozzles 6 are mounted to the lower part of the manifold block 5, and a heater 7 and a temperature sensor 8 for heating are installed in the manifold block 5 and the nozzle 6.

When the movable mold 11 (not shown in detail in the drawing) comes into close contact with the stationary mold, a cavity 12 for forming a product is formed, and molten resin is formed through the valve pin hole at the lower end of the nozzle 6. It is to be injected into the cavity 12.

On the other hand, a molten resin passage elongated in the longitudinal direction of the nozzle is formed in the central portion of the body of the nozzle 6, the valve pin 9 is inserted in the passage to enable the vertical movement. The valve pin drive unit 10 for operating the valve pin 9 is installed at the top of the nozzle 6.

On the other hand, on the upper side of the clamping plate 1 is equipped with a locating ring 14 is supplied with molten resin from an injection molding machine (not shown), the molten resin supplied through the locating ring 14 is a manifold block ( It is injected into the cavity 12 via the runner part 13 in 5) and the molten resin channel in the nozzle 6.

However, in the conventional nozzle 6, since the valve pin 9 is provided in the nozzle and the electric heater 7 and the temperature sensor 8 are installed around the molten resin passage in the nozzle, the nozzle diameter is at least 10 mm or more. It is not suitable for shaping a micro product directly from the nozzle 6, and in order to form a micro product, when molding several runners from one nozzle by branching, the resin of the runner portion must be removed after molding. There is a disadvantage, and there is also a lot of difficulty in machining the nozzle seat of the core.

In addition, even in the case of installing a plurality of nozzles 6 for molding a large amount of products at the same time, there are many restrictions in minimizing the distance between the nozzles, that is, the pitch of the nozzles.

The present invention has been made to solve the problems of the prior art as described above, and an object of the present invention is to provide a nozzle and manifold block assembly capable of injection molding a very small product.

It is another object of the present invention to provide a nozzle and manifold block assembly capable of forming a large amount of product at one time by minimizing the pitch between the cavities, ie the distance between the cavities.

Still another object of the present invention is to provide a nozzle and manifold block assembly which can reduce the manufacturing cost of a mold.

In order to solve the above problems, the nozzle and manifold block assembly used in the hot runner system of the injection molding die, according to an aspect of the present invention, a manifold block including a heater and resin passages therein. (manifold block); A nozzle plate having a plurality of runners formed at an upper portion thereof and a plurality of nozzles formed at a lower portion of each of the runners; And a core plate formed with nozzle seats in which nozzles of the nozzle plate are seated, wherein the manifold block, the nozzle plate, and the core plate are fixed and fastened by fastening bolts. Resin injection passages communicating with each other are formed in the nozzle plate and in the nozzles, and the resin injection passages communicate with the runners so that molten resin is molded through the runners and the resin injection passages. The constituent feature is that it is injected into each cavity and is adapted to mold large quantities of micro products at once.

Here, there is a gap between the nozzles of the nozzle plate and the nozzle sheets of the core plate, so that the nozzles and the nozzle sheets do not contact each other.

Meanwhile, the resin injection passages inside the nozzles and the resin injection holes of the nozzle sheets may be disposed concentrically with each other, or may be disposed eccentrically with each other.

In addition, the nozzles and the nozzle plate may be integrated with each other, or the nozzles may be prefabricated to the nozzle plate.

On the other hand, according to another aspect of the present invention, a nozzle and manifold block assembly for use in a hot runner system of an injection molding die, the manifold block including a heater and a resin passage therein; And a nozzle core plate having a plurality of runners formed at an upper portion thereof, and a plurality of resin injection passages formed at each lower portion of the runners, wherein the manifold block and the nozzle core plate are fastened by fastening bolts. The resin injection passages formed inside the nozzle core plate communicate with the runners so that molten resin is injected into the respective cavity where the product is molded through the runners and the resin injection passages. It is a structural feature that it is suitable to shape a large quantity at once.

The nozzle and manifold block assembly according to the present invention provides the following effects.

Small nozzles formed in the manifold block assembly can be used for injection molding of very small products, for example 2 mm x 2 mm.

By minimizing the diameter of the nozzle, the productivity can be increased by minimizing the distance between the cavities in which the product is to be molded, ie the pitch between the cavities and forming a large number of products at one time, for example 350 or more.

-Since the conventional valve pin is not installed in the nozzle, the valve pin, a device for driving the same, and other processing are not required, thereby making the mold easy and reducing the cost.

-The nozzle and manifold block form an assembly, which reduces the height of the fixed side mold, thereby reducing the mold manufacturing cost.

In addition, in order to mold a small product, a plurality of runners can be omitted compared to the case of forming a product by branching a plurality of runners from a conventional nozzle, thereby increasing cost and increasing productivity.

1 is a view of a conventional injection molding hot runner system.
2 is an exploded cross-sectional view of a nozzle and manifold block assembly of a hot runner system according to an embodiment of the present invention.
3 is an assembly cross-sectional view of a nozzle and manifold block assembly of a hot runner system according to an embodiment of the present invention.
4 is a view of a nozzle plate and a core plate according to another embodiment of the present invention.
5 is a view of a nozzle core plate according to another embodiment of the present invention,

Hereinafter, the nozzle and manifold block assembly of the hot runner system according to the present invention will be described in detail with reference to the accompanying drawings, which are illustrative and are not intended to limit the present invention.

Figure 1 is for the prior art and has been described in the above [Background Art], so it is omitted here.

2 is an exploded view of the nozzle and manifold block assembly of the hot runner system according to an embodiment of the present invention before assembly, and FIG. 3 is a view showing the assembly of the nozzle and manifold block assembly.

2 and 3, the manifold block assembly according to one embodiment of the present invention includes a manifold block 30, a nozzle plate 40 and a core plate 50, which are fastened by fastening bolts. It can be mounted in the clamping plate 21 and the spacer / holding plate 22 to form a fixed side mold.

A resin passage 33 is formed in the manifold block 30, and a heater 31 is provided. Runners 42 through which molten resin can flow are formed on an upper surface of the nozzle plate 40, and molten resin is formed in the lower portions of the runners 42 into cavities (100 in FIG. 3) in which the product is molded. In order to be injected, resin injection passages 43 communicating with the runners 42 are formed, and nozzles 41 are formed at ends of the resin injection passages 43. Meanwhile, nozzle seats 51 on which the nozzles 41 may be seated are formed in the core plate 50, and the nozzles 41 are inserted into the nozzle sheets 51. .

Referring to FIG. 3 further, the nozzle plate 40 may be fixed to the manifold block 30 by the fastening bolt 44, and the core plate 50 may be fixed to the nozzle plate 40 by the fastening bolt 52. ) And the manifold block 30. The assembled manifold block assembly may be fastened to the spacer / holding plate 22 by the fastening bolt 32. When the movable mold 80 is in close contact with the fixed mold including the mold, that is, the mold is closed, the cavities 100 are formed between the fixed mold and the movable mold.

Thus, the molten resin injected through the locating ring 23 mounted on the clamping plate 21 in the injection machine (not shown) is sprue 24, the resin passage 33 in the manifold block 30, The interior of each of the cavities 100 is filled with runners 42 and resin injection passages 43 formed in the nozzle plate 60. When the molten resin filled in the cavities 100 is solidified, the movable side mold 80 is spaced apart from the fixed side mold, that is, opened, and the molded product is taken out.

On the other hand, the heater 31 is installed in the manifold block 30 to always operate the heater 31 during the molding operation, so that the sprue 24, the resin passage 33 in the manifold block 30, the runners ( 42) and the resin in the resin injection passages 43 formed in the nozzle plate 60 can be kept in a molten state at all times, and when the molded product in the cavity 100 is solidified and opened, the injection machine (not shown) By blocking the resin supply nozzles in the ()), it is possible to prevent the molten resin from flowing out of the nozzles 41.

The circled portion in the drawing is an enlarged view of the nozzle 41. Referring to this, the resin injection passages 43 formed in the nozzles 41 and the nozzle sheets 51 of the core plate 50 are shown. It can be seen that the () is centered with each other, that is, the nozzles 41 are arranged concentrically in the nozzle sheets 51, the molten resin introduced through the runner 42 is formed in the nozzle plate 40 It will be readily appreciated that the filling paths 43 are filled into the respective cavities 100.

One thing to note here is that there is a slight gap between the outer surface of the nozzles 41 of the nozzle plate 40 and the inner surface of the nozzle sheets 51 of the core plate 50, so that the nozzles 41 and the nozzle sheets ( 51) do not directly contact. This is to prevent the molten resin in the resin injection passages 43 from being easily solidified because the molten resin in the resin injection passages 43 loses heat toward the movable mold 80 through the nozzle sheets 51.

Although only two runners 42 and eight nozzles 41 are shown in this figure by way of example, this shows only one cross-section, which shows several runners in the longitudinal direction of the mold, that is, in the direction perpendicular to the ground. The rows of 42 and the nozzles 41 can be arranged, so that small products can be produced in large quantities. In fact, more than about 350 products can be co-molded.

Further, referring to FIG. 3 in which the manifold block assembly according to the present invention is assembled, it will be appreciated that the height of the fixed side mold can be significantly reduced compared to the conventional injection molded hot runner system shown in FIG. 1. This is to reduce the manufacturing cost of the mold.

Meanwhile, the nozzles 41 and the nozzle plate 40 may be processed from one plate, and the nozzles 41 and the nozzle plate 40 may be integrated, or only the nozzles 41 may be separately processed. For example, it can also be fitted to the nozzle plate 40 using a screw system or the like.

4 is a view of the nozzle plate 60 and the core plate 70 according to another embodiment of the present invention, the difference from the embodiment of Figure 3 is the nozzles 61 formed in the lower portion of the runner 62 The resin injection passages 63 therein are formed to be eccentric with the center of the nozzle sheets 71 of the core plate 70, and other contents are similar to those of FIG. By this eccentricity, in the case of a soft resin having physical properties, it is possible to prevent the occurrence of a sacking phenomenon.

5 is a view of a nozzle core plate 90 according to another embodiment of the present invention, in which the nozzle plate 40 and the core plate 50 in the embodiment of FIG. 3 are one nozzle core plate 90. Runners 92 are formed on the upper surface of the nozzle core plate 90 without separate nozzles 41, and a plurality of resin injection passages 91 are formed in the nozzle core plate 90. The difference is. The nozzle core plate 90 may be fastened to the manifold block 30 by fastening bolts 93. By doing so, the processing costs for the nozzles 41 and the nozzle sheets 51 can be reduced, and the fabrication of the nozzle core plate 90 can be facilitated.

As described above, using the manifold block assembly of the present invention, for example, it is possible to mold the micro products of about 2 mm x 2 mmm, and to form a large number of cavities in one mold to produce a large amount of products at once, for example More than 350 products can be produced at the same time, greatly contributing to increased productivity.

In addition, there is no need for the valve pin and the valve pin driving unit installed in the conventional nozzle, the structure is simple, and the size of the mold can be reduced, thereby reducing the manufacturing cost of the mold.

The above description has been described by way of example of the present invention, the present invention is not limited to this, and those skilled in the art to which the present invention pertains without departing from the technical spirit of the present invention claimed in the claims. Obvious modifications are possible and such modifications are within the scope of the present invention.

1: clamping plate 2: spacer plate
3: holding plate 4: cavity plate
5: manifold block 6: nozzle
7: heater 8: temperature sensor
9: valve pin 10: valve pin drive unit
11: movable side mold 12: cavity
13 runner part 14 locating ring
21: clamping plate 22: spacer / holding plate
23: locating ring 24: sprue
30: manifold block 31: heater
32: fastening bolt 33: resin passage
40: nozzle plate 41: nozzle
42: runner 43: resin injection passage
44: fastening bolt 50: core plate
51: nozzle seat 52: tightening bolt
60: nozzle plate 61: nozzle
62: runner 63: resin injection passage
70: core plate 71: nozzle seat
80: movable side mold 90: nozzle core plate
91: resin injection passage 92: runner
93: tightening bolt 100: cavity

Claims (7)

A nozzle and manifold block assembly for use in a hot runner system of an injection mold,
A manifold block including a heater and resin passages therein;
A nozzle plate having a plurality of runners formed at an upper portion thereof and a plurality of nozzles formed at a lower portion of each of the runners; And
And a core plate on which nozzle seats on which nozzles of the nozzle plate are seated are formed.
The manifold block, the nozzle plate and the core plate are fixed and fastened by fastening bolts, and resin injection passages are formed in the nozzle plate and in the nozzles, and the resin injection passages are connected to the runners. In communication with the nozzle, the molten resin is injected through the runners and the resin injection passages into respective cavities in which the products are molded, and the nozzles and the manifold block are formed in a large amount at a time. Assembly.
The method of claim 1,
And a gap between the nozzles of the nozzle plate and the nozzle sheets of the core plate such that the nozzles and the nozzle sheets do not contact each other.
The method of claim 1,
And the resin injection passages inside the nozzles and the resin injection holes of the nozzle sheets are arranged concentrically with each other.
The method of claim 1,
And the resin injection passages inside the nozzles and the resin injection holes of the nozzle sheets are eccentrically disposed.
The method of claim 1,
And the nozzle plate and the nozzle plate are integral with each other.
The method of claim 1,
The nozzle and manifold block assembly, wherein the nozzles are prefabricated to the nozzle plate.
A nozzle and manifold block assembly for use in a hot runner system of an injection mold,
A manifold block including a heater and resin passages therein; And
And a nozzle core plate having a plurality of runners formed at an upper portion thereof, and a plurality of resin injection passages formed at each lower portion of the runners.
The manifold block and the nozzle core plate are fixed and fastened by fastening bolts, and the resin injection passages formed inside the nozzle core plate communicate with the runners, so that molten resin is formed in the runners and the resin injection passages. Nozzles and manifold block assemblies, through which the products are injected into each cavity to be molded, and the micro-products are molded in large quantities at one time.

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