KR101787571B1 - Injection molding apparatus - Google Patents

Abstract

The present invention discloses an injection mold apparatus in which a multi-stage pin point gate is implemented in a three-stage mold apparatus, and a plurality of products having mutual relations are injected at the same time, In order to increase product production efficiency by shortening the cycle time of injection molding in the mass production of the product through injection molding, which is advantageous, and to improve the separation efficiency of product and runner which are advantages of the two-stage mold, And the advantages of the three-stage molds, enhances the dimensional accuracy of the injection-molded product, reduces the waste of materials in the injection molding of the product, freely adjusts the size of the runner, , Flexible condition control and quality reproducibility, that is, the same product after the first injection molding for the product To reduce the quality deviation for each product during injection molding, to enable injection molding of fusion and high-grade products, and to reduce manufacturing and production costs.

Description

{INJECTION MOLDING APPARATUS}

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an injection mold apparatus, and more particularly, to an injection mold apparatus for simultaneously manufacturing injection molding of mold release products having different shapes.

Generally, the plastic injection process is a final product produced through steps including a raw material drying process, an injection molding process, an injection molding process, a molding process, a post-process, and a packaging process. In the injection molding process, The device is mainly composed of a two-stage mold and a three-stage mold.

The two-stage mold apparatus according to the prior art is disclosed in Published Utility Model No. 20-1998-042735 (published on September 25, 1998), Published Utility Model No. 20-2000-0001351 (published on January 25, 2000) 10-2015-0035608 (Laid-open date 2015.04.06), and these two-stage molds are capable of separately separating the injection molded product and the runner.

However, the two-stage mold apparatus according to the related art has a problem in that the product having injection molding is unbalanced because the gate length, cross-sectional area, or runner arrangement state is not uniformly designed. There is a drawback that injection molding can not be performed.

In addition, the conventional two-stage mold apparatus has a low dimensional accuracy, a long sprue, a large amount of material waste in injection molding, difficulty in adjusting the size of the runner, a limited gate selection, Flexible condition control and quality reproducibility In other words, there is a problem that the quality of each product is not the same during the injection molding of the same product after the first injection molding and the deviation is generated, , The application is limited and impossible, and manufacturing and production costs of injection parts are high.

On the other hand, the three-stage mold apparatus is a mold apparatus suitable for producing small parts requiring a large amount of production, products requiring precision, products which should not be exposed to external gates, or large products in which the flow of resin is not easy. Which can be automatically injected, so that a product can be mass-produced continuously by injection molding.

The three-stage mold apparatus according to the prior art is disclosed in Japanese Utility Model Publication No. 20-1990-0005803 (Publication date 1990.06.30), and Patent document 10-2006-0107001 (Publication date October 13, 2006).

However, in the three-stage mold apparatus according to the related art, there is a problem that an injection molded product is unbalanced because the length, cross-sectional area or runner arrangement state of the gate is not uniformly designed. There is a drawback that injection molding can not be performed.

In addition, the three-stage mold apparatus according to the prior art has a low dimensional accuracy, a long sprue, and a structure in which a tunnel and a side gate are drawn into a secondary sprue and a runner, It has a lot of waste, it is difficult to adjust the size of the runner, the gate selection is limited, Flexible Condition Control and quality reproducibility. That is, after the first injection molding for the product, The quality is not the same and the deviation is generated. In addition, the application to the fusion and high-quality products is limited and impossible, and the production cost and production cost of the injection part are high.

In particular, the three-stage mold apparatus according to the prior art has a merit that a product can be continuously mass-produced by injection molding, while the efficiency is low due to a long cycle time of injection molding due to mass production.

Korean Utility Model Publication No. 20-1998-042735 Korean Utility Model Publication No. 20-2000-0001351 Korean Utility Model Publication No. 20-1990-0005803 Korean Patent Publication No. 10-2006-0107001

It is an object of the present invention to improve the problems of the two-stage mold apparatus and the three-stage mold apparatus according to the prior art and to improve the separation efficiency of the product and the runner so as to satisfy both the merits of the two- And to enable mass production of products while simultaneously allowing injection molding of release molds of different shapes at the same time.

To achieve the above object,

The injection mold apparatus of the present invention comprises a first phase fixing plate mounted on an injector, a second phase fixing plate coupled to a top plate between the first phase fixing plate and the first phase fixing plate, a heating block disposed in the top plate and heating the molten resin, A stationary-side mold unit including a runner plate disposed in the block and formed with a sprue through which the molten resin is injected, the runner plate having a flow path through which the molten resin flows; And

A leg provided on an upper portion of the upper plate, a foot plate provided on an upper portion of the leg portion, and an upper plate provided on the upper portion of the foot holder, A movable mold section including a molded support block on which the mold release products are mounted on the upper side;

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First and second runner lock pins formed at different lengths in a lower portion of the runner plate so as to branch and supply the molten resin flowing through the flow path;

A stripper plate connected to the rod of the hydraulic cylinder fixed to the second phase fixing plate so as to be able to move up and down and to pass the first and second runner lock pins penetrating through the second phase fixing plate;

Wherein the first and second runner lock pins are disposed between the stripper plate and the molding support block so that the stripper plate and the molding support block can be connected to the first and second runner lock pins during injection molding of the mold release products, An insert molding block which is detached from the runner lock pin and in which gate holes are arranged at an upper portion;

A runner connected to the first runner lock pin to guide the molten resin supplied through the flow path and the first runner lock pin to the insert molding block, the runner being disposed at a lower portion of the stripper plate;

A gate pin arranged in the runner and inserted in the gate hole;

A pair of first cavities formed inside the lower end of the insert molding block facing the forming support block in communication with the gate hole and connected to the gate pin and the upper end through gate holes and separated from each other;

A cavity runner connected to the second runner lock pin through the gate hole, and a lower end connected to the cavity gate, the cavity runner being formed in the lower end of the lower end of the insert molding block facing the molded support block in communication with the gate hole, A pair of second cavities;

A lower plate provided above and below the upper plate, the lower plate and the lower plate;

Mill pins arranged on the top of the plate to correspond to the first and second cavities to extract mold release products from the molding support block;

A plate support plate installed on an upper portion of the plate to fix a lower end of the plate pins; And

A return pin installed between the plate support plate and the support plate for returning the plate, the plate support plate, and the support pins to the original position by using the elastic force of the return spring;

As shown in FIG.

Further, in the injection mold apparatus of the present invention, the pair of first cavities may be formed in the same shape or different shapes.

Further, in the injection mold apparatus of the present invention, the pair of second cavities may be formed in the same shape or different shapes.

Further, in the injection mold apparatus of the present invention, the gate pin may be a pin point gate, a side gate, a tunnel gate, a direct gate, a fan gate ), An edge gate, a ring gate, a flash gate, a tab gate, a diaphragm gate, and a cashew gate. .

According to the present invention, it is possible to increase the separation efficiency between the release product and the runner, which is an advantage of the two-stage mold, and to mass-produce the injection molding, which is an advantage of the three-stage mold, By shortening the time, it is possible to increase the production efficiency of the mold release product, increase the dimensional accuracy of the mold release product, and reduce the material waste in the injection molding of the mold release product.

It is also possible to select gate pins of various types (eg pin point, side, tunnel, direct, fan, edge, ring, flash, tab, diaphragm, cashew etc.) Quality reproducibility. In other words, it is possible to reduce the quality deviation for each product during the injection molding of the same product after the first injection molding for one product, thereby enabling the injection molding of the fusion product and the high quality product, The effect can be expected.

1 is a sectional view showing a structure of an injection mold apparatus according to an embodiment of the present invention;
2 is a cross-sectional view showing a state in which the movable-side mold portion of the injection mold apparatus is lowered according to an embodiment of the present invention;
3 is a cross-sectional view illustrating a moving state of a stripper plate according to an embodiment of the present invention.
4 is a sectional view showing a state in which release products are extracted from an insert molding block according to an embodiment of the present invention;
5 is a cross-sectional view showing a state in which release products are extracted by the mill pins from a forming support block according to an embodiment of the present invention.

Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings.

1 to 5, an injection mold apparatus according to an embodiment of the present invention includes a fixed-side mold unit 100 and a movable-side mold unit 200, and includes an insert molding block 10, a molded support block 20, a runner plate 30, and a stripper plate 40.

The fixed-side mold unit 100 is a mold in which a molten resin for injection molding is injected into the mold release products c1, c1 ', c2, c2', c3, c3 'and c4, A top plate 103 and a top plate 103 which are coupled between the first and second top plates 101 and 102, And a heating block 104 for heating the molten resin to maintain the temperature of the molten resin.

The movable side mold part 200 is fitted or separated to the fixed side mold part 100 according to the driving of a driving part (not shown) which can be realized by a normal hydraulic cylinder. The movable side mold part 200 includes a top plate 201, And a foot plate 203 that is supported by the legs 202. The foot plate 202 may be formed of a metal plate.

An eject guide pin 204 for lifting or lowering the top plate 201, the leg portion 202, and the bottom plate 203 from the fixed-side mold portion 100 when the driving portion is driven, And a tilting plate 205 and a tilting plate 206 which are provided in a space formed between the base plate 201, the leg portion 202 and the receiving plate 203 and which are raised and lowered from the driving of the driving portion.

The lower end of the plate 205 is fixed to the upper portion of the plate 205 through the plate support plate 206 and the lower end of the release plate 203 and the mold support block 20 are injection- The mill pins 207 for extracting the products c1 ', c2', c2 ', c3, c3' and c4 and the mill plate 205, the plate support plate 206 and the mill pins 207 returning to the original position by using the elastic force of the return spring 209. [ Here, the driving unit moves the eject guide pin 204 up and down.

The insert molding block 10 is disposed between the stationary-side mold 100 and the movable-side mold 200 and can be moved up and down by a separate guide block (not shown) (C1), (c2), (c3), (c3 '), and (c4) on the inside of the lower cavity facing the first cavity 11a and the second cavity 11a ).

Herein, the first cavity 11 and the second cavity 11a may be formed by injection molding of inserts c1, c1, c2, c2, c3, c3, Are formed in the lower part of the lower part of the molding block 10 in different shapes.

In the insert molding block 10, gate holes 12 communicating with the first and second cavities 11 and 11a may be arranged. The first cavity 11 may be formed of a pair of the same shape or different shapes, which are separated from each other. The second cavity 11a may include a cavity runner R and a cavity gate (G), or a pair of different shapes.

The cavity runner R is connected to a second runner lock pin 33a having a length extending to the forming support block 20. [

The forming support block 20 is configured to support the insert molding block 10 in the upward direction in the figure.

At this time, the insert molding block 10 and the molding support block 20 are disposed at the upper portion of the plate 203 constituting the movable die 200, and can be interlocked with the lifting and lowering of the plate 203 have. Then, the insert forming block 10 is assembled to or separated from the forming support block 20 by being raised and lowered by a guide block (not shown).

The runner plate 30 is disposed in a heating block 104 provided between the first and second fixing plates 101 and 102 constituting the stationary-side mold unit 100. The runner plate 30 is inserted into the insert- When the molten resin for injection molding of the release products c1 ', c2', c2 ', c3', c3 ', and c4 is supplied to the insert molding block 10, (C1 '), (c2), (c2'), (c3), (c3 ') and (c4) formed by injection molding are separated from the insert molding block 10 during the extraction. Therefore, the runner plate 30 is formed with the spool 31 for supplying the molten resin through the first phase fixing plate 101 at the upper portion, the flow path 32 through which the molten resin flows, First and second runner lock pins 33 and 33a having different lengths are formed.

The molten resin that is supplied through the sprue 31 and flows through the flow path 32 is separated by the heating block 104 into the release products c1, c1 ', c2, c2' and c3, the first and second cavities 33 and 33a of the insert molding block 10 are heated through the flow path in the first and second runner lock pins 33 and 33a, (11), (11a), the cavity runner (R) and the cavity gate (G).

The first and second runner lock pins 33 and 33a pass through the second phase fixing plate 102 and pass through the stripper plate 40. The lengths of the lock pins 33 and 33a are set in the insert molding block 10 The first and second cavities 11 and 11a are formed differently from each other so as to supply molten resin.

The stripper plate 40 is provided to guide the molten resin supplied through the flow path 32 of the runner plate 30 and the first and second runner lock pins 33 and 33a to the insert molding block 10, And a gate pin (42) arranged at the lower portion of the runner (41).

The stripper plate 40 is connected to a rod 51 of a hydraulic cylinder 50 fixed to the second phase fixing plate 102 and is configured to be able to move up and down by the hydraulic cylinder 50.

The gate pin 42 is inserted into the gate hole 12 communicating with the first and second cavities 11 and 11a and connected to the upper ends of the first and second cavities 11 and 11a.

At this time, the gate pin 42 and / or the cavity gate G may include a known pin point gate, a side gate, a tunnel gate, a direct gate, A gate, a gate, a fan gate, an edge gate, a ring gate, a flash gate, a tab gate, a diaphragm gate, or a cashew gate. And it can be applied to the stripper plate 40 according to the characteristics of the release product C to be injection-molded.

The runner 41 may have a through hole (not shown) through which the first runner lock pin 33 can pass, as well as a through hole (not shown) formed in the stripper plate 40.

Hereinafter, an injection molding method of an injection mold apparatus according to an embodiment of the present invention will be described with reference to the accompanying drawings.

1, in the injection mold apparatus according to the embodiment of the present invention, in order to injection mold the release products c1, c1 ', c2, c2', c3, c3 ', and c4 The driving portion is driven to move the movable mold portion 200 including the top plate 201, the leg portion 202 and the receiving plate 203 up and down through the eject guide pin 204 to be engaged with the fixed side mold portion 100 .

The insert molding block 10 having the first and second cavities 11 and 11a formed between the fixed side mold part 100 and the movable side mold part 200 and the molding support block 20 are in close contact with each other The injection mold apparatus maintains a closed state for injection molding of the release products c1, c1 ', c2, c2', c3, c3 ', and c4.

Thereafter, the molten resin is supplied through the sprue 31 of the runner plate 30 of the stationary-side mold part 100 in the closed state of the injection mold apparatus.

Since the runner plate 30 is disposed in the heating block 104, the molten resin supplied through the sprue 31 of the runner plate 30 flows through the flow path 32 into the first and second runner locks 30, The molten resin thus heated is heated to a predetermined temperature when the branch feed to the pins 33 and 33a is performed and the molten resin is heated by the runner 41 and the gate pin 42 formed in the stripper plate 40 and the cavity runner R Are injected into the upper and lower ends of the first and second cavities (11, 11a) formed in the insert molding block (10) through the cavity gate (G).

The gate pin 42 and the cavity gate G may be formed of a known pin point gate, a side gate, a tunnel gate, a direct gate, a fan gate a fan gate, an edge gate, a ring gate, a flash gate, a tab gate, a diaphragm gate, or a cashew gate. And the insert molding block 10 having the gate hole 12 corresponding to the gate pin 42 applied as described above is used.

That is, the shapes of the first and second cavities 11 and 11a are determined according to the characteristics of the mold release products c1 ', c2', c2 ', c3', c3 ' Of course, the insert molding block 10 in which the shape of the gate hole 12 is changed can be manufactured and applied to the injection mold apparatus.

Therefore, the injection mold apparatus according to the embodiment of the present invention is characterized in that the runner 41 and the gate pin 42 of the stripper plate 40 and the release molds c1, c1 ', c2' the molten resin is simultaneously supplied to the upper and lower ends of the first and second cavities 11 and 11a through the cavity runner R and the cavity gate G according to (c2 '), (c3'), (C1 '), (c2), (c2'), (c3), (c3 ') and (c4) can be injection-molded through one injection mold device at the same time.

On the other hand, when the molten resin is hardened and injection molding of the mold release products c1 ', c2', c2 ', c3', c3 'and c4 is completed, the molten resin is extracted from the injection mold apparatus.

When the eject guide pin 204 provided on the movable mold 200 is returned to its original position through the drive of the drive unit, the ejection guide pin 204 is returned from the top plate 201 and the leg 201, The insert molding block 10 and the molding support block 20 are first lowered as well as the movable mold 200 including the mold 202 and the support plate 203. [

2, the insert molding block 10 is detached from the stripper plate 40 and the gate pin 42 of the stripper plate 40 is removed from the gate hole 12 formed in the insert block 10 Separated. And the second runner lock pin 33a extending from the runner plate 30 to the lower end of the insert molding block 10 is separated from the cavity runner R. [

3, the stripper plate 40 connected to the rod 51 is moved downward through the hydraulic cylinder 50 to separate the first runner lock pin 33 from the gate pin 42 .

As shown in FIG. 4, when the eject guide pin 204 provided on the movable side mold part 200 is pulled out to the original position by driving the driving part, the eject guide pin 204 is returned from the ejection guide pin 204 The molding support block 20 is lowered secondarily as well as the movable side mold portion 200 including the top plate 201, the leg portion 202 and the support plate 203, (C1), (c2), (c2), (c3), (c3 ') and (c4) are separated from the first and second cavities 11 and 11a in the molding support block 20, Can be placed on top of.

5, when the mill pins 207 arranged so as to correspond to the slider support plate 206 and the first and second cavities 11 and 11a are raised through the plate 205, The mold releasing products C 2, c 2 ', c 3 and c 3' having the cavity runner R and the cavity gate G connected thereto are separated from the cavity runner R and the cavity gate G, All of the release products c1 ', c2', c3 ', c3', and c4 formed by injection molding from the injection mold apparatus can be easily extracted by the mill pins 207 have.

Therefore, it is possible to increase the dimensional accuracy of the extracted product, to reduce the material waste in the injection molding of the mold release products, to freely adjust the size of the runner, and to provide flexible condition control and quality reproducibility It is possible to perform injection molding of fusion products and high quality products while reducing the quality deviation for each product during injection molding of the same product again after the initial injection molding for the product.

When the plate support plate 206 is lifted by the plate 205, the return spring 209 of the return pin 208 is compressed and the release products c1, c1 ', c2, c2', and c3 the pushing plate 205 and the mill pins 207 as well as the plate supporting plate 206 are returned to their original positions by the elastic force of the return spring 209 after the completion of the extraction of the cans You can.

While the present invention has been described with reference to the accompanying drawings, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the invention.

Therefore, it is to be understood that the present invention is not limited to the specific embodiment described above, and that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims. And such changes are, of course, within the scope of the claims.

10: Insert molding block 11: First cavity
11a: second cavity 12: gate hole
20: forming support block 30: runner plate
31: Sprue 32: Euro
33: first runner lock pin 33a: second runner lock pin
40: stripper plate 41: runner
42: Gate pin 50: Hydraulic cylinder
51: rod 100: fixed side mold part
101: first phase fixing plate 102: second phase fixing plate
103: Senor plate 104: Heating block
200: movable-side mold unit 201:
202: leg portion 203:
204: eject guide pin 205:
206: plate support plate 207:
208: return pin 209: return spring
C: Molded product R: Cavity runner
G: cavity gate

Claims (3)

A second upper fixing plate disposed between the first upper fixing plate and the upper fixing plate, a second heating plate disposed in the upper plate and heating the molten resin, A stationary-side mold portion including a runner plate formed with a flow path through which the molten resin flows, through which the injected sprue passes through the first-phase stationary plate; And
A leg provided on an upper portion of the upper plate, a foot plate provided on an upper portion of the leg portion, and an upper plate provided on the upper portion of the foot plate and being injection-molded A movable side mold part including a molded support block on which the mold release products are mounted;
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First and second runner lock pins formed at different lengths in a lower portion of the runner plate so as to branch and supply the molten resin flowing through the flow path;
A stripper plate connected to the rod of the hydraulic cylinder fixed to the second phase fixing plate so as to be able to move up and down and to pass the first and second runner lock pins penetrating through the second phase fixing plate;
Wherein the first and second runner lock pins are disposed between the stripper plate and the molding support block so that the stripper plate and the molding support block can be connected to the first and second runner lock pins during injection molding of the mold release products, An insert molding block which is detached from the runner lock pin and in which gate holes are arranged at an upper portion;
A runner connected to the first runner lock pin to guide the molten resin supplied through the flow path and the first runner lock pin to the insert molding block, the runner being disposed at a lower portion of the stripper plate;
A gate pin arranged in the runner and inserted in the gate hole;
A pair of first cavities formed inside the lower end of the insert molding block facing the forming support block in communication with the gate hole and connected to the gate pin and the upper end through gate holes and separated from each other;
A cavity runner connected to the second runner lock pin through the gate hole, and a lower end connected to the cavity gate, the cavity runner being formed in the lower end of the lower end of the insert molding block facing the molded support block in communication with the gate hole, A pair of second cavities;
A lower plate provided above and below the upper plate, the lower plate and the lower plate;
Mill pins arranged on the top of the plate to correspond to the first and second cavities to extract mold release products from the molding support block;
A plate support plate installed on an upper portion of the plate to fix a lower end of the plate pins; And
A return pin installed between the plate support plate and the support plate for returning the plate, the plate support plate, and the support pins to the original position by using the elastic force of the return spring;
Further comprising:
The method according to claim 1,
Wherein the pair of first cavities have the same shape or different shapes.
The method according to claim 1,
Wherein the pair of second cavities have the same shape or different shapes.

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