KR20170017246A

KR20170017246A - Injection molding apparatus for thin products

Info

Publication number: KR20170017246A
Application number: KR1020150110893A
Authority: KR
Inventors: 이규철; 김종민; 이상훈; 임정섭; 함승규
Original assignee: 삼성전자주식회사
Priority date: 2015-08-06
Filing date: 2015-08-06
Publication date: 2017-02-15

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an injection mold apparatus for a thin-walled product for molding an injection molded article having a small thickness, An injection mold apparatus for a thin-walled product includes a top plate installed in a fixed clamping plate of the injector, and a hot runner system installed therein; A top mold installed on the upper plate; A lower mold installed to be movable with respect to the upper mold and including a lower mold coupled to the upper mold to form a cavity corresponding to the upper mold; A stripper plate installed movably above the lower mold plate and pushing up the injection molding when the upper mold is separated from the lower mold; A first insert core plate movably installed below the lower mold plate and including a first insert core penetrating the lower mold plate and coupled to the lower mold to form a part of the cavity; And a plurality of link members connecting the upper plate and the lower plate.

Description

[0001] Injection molding apparatus for thin products [0002]

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 a thin wall molded article which can perform injection molding with a thin product.

BACKGROUND OF THE INVENTION With the development of electronic technology, electronic appliances such as home appliances such as washing machines, vacuum cleaners and refrigerators, and office appliances such as copiers, printers and multifunction devices are widely used.

Such electronic products use a lot of parts manufactured by injection molding using plastic, resin, or the like.

However, until now, the thickness of the product has been designed to be about 1.8mm to about 3.5mm.

However, it is desirable to make the thickness of the product as thin as possible in terms of weight reduction and cost reduction of the product.

In order to make an injection product thinner, that is, as a thinner product, there is a need for an injection molding machine for molding a thin plastic or resin, an injection machine capable of molding a thinner product, and a thinner product.

Generally, in order to form a thin-walled injection molding product of about 1.4 mm or less, the resin should have a fluidity of 350 mm / sec or more, an injection molding machine of 650 tons or more, and an injection speed of 250 mm / sec or more.

In addition, the injection molding apparatus should be capable of solving the problems of unfolding, whitening, cracking, pinching, and the like which may occur during the molding of the thin-walled product.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and it is an object of the present invention to provide an injection molding apparatus capable of injection molding a thin walled product having a thickness of about 1.4 mm or less.

According to an aspect of the present invention, there is provided an injection mold apparatus for a thin-walled product installed in an injection molding machine, the injection molding apparatus comprising: a top plate installed in a fixed clamping plate of the injection molding machine and having a hot runner system therein; A top mold installed on the upper plate; A lower mold installed to be movable with respect to the upper mold and including a lower mold coupled to the upper mold to form a cavity corresponding to the upper mold; A stripper plate installed movably above the lower mold plate and pushing up the injection molding when the upper mold is separated from the lower mold; A first insert core plate movably installed below the lower mold plate and including a first insert core penetrating the lower mold plate and coupled to the lower mold to form a part of the cavity; And a plurality of link members connecting the upper plate and the lower plate.

The second insert core plate includes a second insert core movably disposed below the first insert core plate and coupled to the lower insert core through the first insert core plate to form a part of the cavity. ; &Lt; / RTI >

A plurality of springs may be provided between the first insert core plate and the second insert core plate.

Further, the separating force between the first insert core plate and the second insert core plate is set such that the separation force between the upper die and the stripper plate, the separating force between the stripper plate and the lower die plate, and the separation force between the lower die plate and the second insert core plate, May be smaller than the separating force between the core plates.

The separating force between the upper die and the stripper plate may be smaller than the separating force between the lower plate and the lower die plate and the separating force between the lower die plate and the first insert core plate.

The separation force between the stripper plate and the lower mold plate may be greater than the separation force between the lower mold plate and the first insert core plate.

Further, the stripper plate can be separated from the lower plate by an eject rod.

At least one air jet opening may be formed at the upper end of the lower mold so as to inject air into the cavity.

An upper protruding portion may be formed on the lower surface of the upper plate, and an upper depressed portion corresponding to the upper protruding portion may be formed on the upper surface of the stripper plate.

Further, a lower concave portion may be formed on the upper surface of the lower mold plate around the lower mold, and a lower protrusion corresponding to the lower concave portion may be formed on a lower surface of the stripper plate.

Each of the plurality of link members may include an upper link fixed to the upper plate; And a lower link fixed to the lower plate, wherein a guide groove is formed in one of the upper link and the lower link in a longitudinal direction, and a tip of the other of the upper link and the lower link is inserted into the guide groove A guide protrusion for moving the guide protrusion can be provided.

According to another aspect of the present invention, there is provided an injection mold apparatus for a thin-walled product installed in an injection machine to form an injection mold, comprising: a top plate installed in a clamping plate on one side of the injector; A top mold installed on the upper plate; A lower mold installed to be movable with respect to the upper mold and including a lower mold coupled to the upper mold to form a cavity corresponding to the upper mold; A stripper plate installed movably above the lower mold plate and pushing up the injection molding when the upper mold is separated from the lower mold; A first insert core plate movably installed below the lower mold plate and including a first insert core penetrating the lower mold plate and coupled to the lower mold to form a part of the cavity; A second insert core plate movably disposed below the first insert core plate and including a second insert core penetrating the first insert core plate to be coupled to the lower die to form a part of the cavity; And a plurality of link members connecting the upper plate and the lower plate, wherein the mold insert of the injector is firstly separated from the second insert core plate and the first insert core plate.

The method of claim 18, wherein the second insert core plate is moved in a first direction to separate from the first insert core plate. The second insert core plate, the first insert core plate, the lower die plate, and the stripper plate move together in the first direction to separate the stripper plate from the upper die; The second insert core plate and the first insert core plate move together in the first direction to separate the first insert core plate from the lower plate; Blowing air into the cavities formed between the upper and lower molds; And moving the stripper plate in a second direction opposite to the first direction to separate the stripper plate from the lower plate.

Further, the distance that the stripper plate moves in the upper mold may be limited by the plurality of link members.

1 is a perspective view of an injection mold apparatus for a thin-walled product according to an embodiment of the present invention;
FIG. 2 is a view showing a state where the injection mold apparatus for the thin-walled product of FIG. 1 is mounted on the injection machine;
FIG. 3A is a front view showing a state before an injection mold apparatus for a thin-walled product according to an embodiment of the present invention is started. FIG.
FIG. 3B is a sectional view of the injection mold apparatus for the thin-walled product of FIG.
Fig. 3c is a sectional view showing a plurality of springs in the injection mold apparatus for the thin-walled product of Fig. 3a;
4A is a front view illustrating a state in which a second insert core plate is separated from a first insert core plate in an injection mold apparatus for a thin-walled product according to an embodiment of the present invention;
FIG. 4B is a sectional view of the injection mold apparatus for the thin-walled product of FIG. 4A; FIG.
FIG. 4C is a sectional view showing a plurality of springs in the injection mold apparatus for the thin-walled product of FIG. 4A; FIG.
5A is a front view illustrating a state in which a lower mold plate is separated from a top mold in an injection mold apparatus for a thin-walled product according to an embodiment of the present invention;
Fig. 5B is a sectional view of the injection mold apparatus for the thin-walled product of Fig. 5A; Fig.
FIG. 6A is a front view showing a state in which a first insert core plate is separated from a lower mold plate in an injection mold apparatus for a thin-walled product according to an embodiment of the present invention; FIG.
FIG. 6B is a sectional view of the injection mold apparatus for the thin-walled product of FIG. 6A; FIG.
FIG. 6C is a sectional view showing an eject rod in the injection mold apparatus for the thin-walled product of FIG. 6A; FIG.
FIG. 7A is a front view showing a state in which a stripper plate is operated in an injection mold apparatus for a thin-walled product according to an embodiment of the present invention; FIG.
FIG. 7B is a sectional view of the injection mold apparatus for the thin-walled product of FIG. 7A; FIG.
FIG. 7C is a sectional view showing an ejection rod in the injection mold apparatus for the thin-walled product of FIG. 7A; FIG.
8 is a partial cross-sectional view of a lower mold in an injection mold apparatus for a thin-walled product according to an embodiment of the present invention;
Fig. 9 is a cross-sectional view of the injection mold apparatus for thin-wall products of Fig. 1 taken along line 9-9; Fig.
10A is a partial sectional view showing a cavity in which an injection molding is formed in an injection mold apparatus for a thin-walled product according to an embodiment of the present invention;
FIG. 10B is a partial cross-sectional view illustrating a case where an injection material is formed in a cavity of an injection mold apparatus for a thin-walled product according to an embodiment of the present invention; FIG.
11A is a perspective view showing an example of an injection-molded product injection-molded by an injection mold apparatus for a thin-walled product according to an embodiment of the present invention,
Fig. 11B is a cross-sectional view of the injection molding of Fig. 1 taken along line 11-11. Fig.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of an injection mold apparatus for a thin-walled product according to the present invention will be described in detail with reference to the accompanying drawings.

It is to be understood that the embodiments described below are provided for illustrative purposes only, and that the present invention may be embodied with various modifications and alterations of the embodiments described herein. In the following description, well-known functions or components are not described in detail to avoid obscuring the subject matter of the present invention. In addition, the attached drawings are not drawn to scale in order to facilitate understanding of the invention, but the dimensions of some of the components may be exaggerated.

1 is a perspective view showing an injection mold apparatus for a thin-walled product according to an embodiment of the present invention. 2 is a view illustrating a state in which an injection mold apparatus for a thin-walled product according to an embodiment of the present invention is mounted on an injection machine. 3A is a front view showing a state before an injection mold apparatus for a thin-walled product according to an embodiment of the present invention is started, FIG. 3B is a sectional view of the injection mold apparatus for a thin- Sectional view for showing a plurality of springs in an injection mold apparatus for a thin-walled product of FIG.

An injection mold apparatus for a thin-walled product according to an embodiment of the present invention is an injection mold apparatus which is provided on an injection apparatus and is capable of injection-molding an injection-molded article having a thin thickness, for example, an article having a thickness of 1.4 mm or less, .

1 to 3B, an injection mold apparatus 1 for a thin-walled product according to an embodiment of the present invention includes a top plate 10, a bottom plate 20, a stripper plate 30, A plate 40, and a second insert core plate 50.

The upper plate 10 is installed on the fixed clamping plate 101 of the injector 100 and fixes and supports the upper die 11. A hot runner system (not shown) is provided inside the upper plate 10. The hot runner system enables continuous injection by keeping the injection material in a liquid state by applying heat to the flow path connecting the injector 100 and the cavity 3 of the injection mold apparatus 1 for thin- , The hot runner system according to the prior art can be used as it is, and a detailed description will be omitted. An upper protruding portion 13 is formed on the lower surface of the upper plate 10 around the upper die 11.

The upper mold 11 is provided on one side of the upper plate 10, that is, on the opposite side to the side fixed to the fixed clamping plate 101 of the injector 100, and the upper mold 11 has a certain molded article 5 And the product groove 12 into which the lower die 21 is inserted is formed. The injection molding apparatus 1 for a thin-walled product according to the present embodiment forms the product groove 12 of the upper mold 11 so as to be able to inject the deep-drawn injection product 5 as shown in Figs. 11A and 11B.

The lower mold 21 is installed on the upper surface of the lower mold 20 so as to face the upper mold 120 and the upper portion of the lower mold 21 is formed to correspond to the inner shape of the certain injection mold 5. 10A, when the top mold 110 and the bottom mold 21 are coupled to each other, the shape of the certain molded article 5 by the product groove 12 of the upper mold 11 and the upper portion of the lower mold 21 A cavity 3 having a corresponding shape is formed. The lower die (21) is provided with a core hole (22) through which the first insert core (41) can be inserted. The cavity 21 corresponding to the portion 5a of the injection mold 5 is formed between the lower mold 21 and the first insert core 41 when the first insert core 41 is inserted into the core hole 22 of the lower mold 21. [ 3 are formed.

Concretely, when the upper mold 11 and the lower mold 21 are coupled, the cavity 3 corresponding to a certain molded article 5 is formed by the product grooves 12 of the upper mold 11 and the upper portion of the lower mold 21 facing each other And the internal dimension of the cavity 3 corresponds to the dimension of the injection mold 5. Therefore, when molten plastic or resin, which is an injection material, is injected into the cavity 3 through a hot runner system and cooled, a predetermined injection product 5 is formed. The above-described hot runner system extends to the upper mold 11 so as to supply the injection material to the cavity 3.

The lower die plate 20 is provided to be movable with respect to the upper plate 10 so as to face the upper plate 10. The lower die plate 20 is coupled to the upper die 11 on the upper side of the lower die plate 20, A lower mold 21 for forming a corresponding cavity 3 is provided. A lower concave portion 23 having a predetermined depth around the lower die 21 is formed on the upper surface of the lower plate 20. The lower die plate 20 is installed so as to be able to slide up and down linearly along the four support bars 70.

At the upper end of the lower mold 21, as shown in FIG. 8, at least one air injection port 25 is provided so as to inject air into the cavity 3. The air injection port 25 is connected to the air injection path 26 and the inlet 26a of the air injection path 26 is provided on the side surface of the lower plate 20. Air is injected into the air injection port 25 so that air is injected into the air injection port 25 between the lower mold 21 and the injection mold 5 during the injection process, Thereby breaking the vacuum state that may be formed in the vacuum chamber. Therefore, the force required to separate the injection object 5 fitted in the lower mold 21 can be reduced.

The stripper plate 30 is provided on the upper side of the lower mold plate 20 so as to be movable in a direction perpendicular to the lower mold plate 20 and is provided with an injection mold 5 formed by the upper mold 11 and the lower mold 21, 21). Specifically, the stripper plate 30 is positioned between the upper plate 10 and the lower plate 20, and the lower plate 21 protrudes above the stripper plate 30. Therefore, the stripper plate 30 is provided with a hole 32 through which the lower die 21 can be inserted. The slide core 31, which forms the side groove of the molded article 5, can be slidably moved on the upper surface of the stripper plate 30.

The slide movement of the stripper plate 30 is guided by the four support bars 70 in the same manner as the lower plate 20. The stripper plate 30 is moved upward (in the direction of the arrow B) by the ejector rod 80, that is, in a direction away from the lower plate 20. When the stripper plate 30 is moved upward by the ejector rod 80, the injection product 5 in close contact with the lower die 21 is moved upward by a certain distance to facilitate the removal.

The stripper plate 30 is supported by a plurality of return springs 82. When the ejector rod 80 is removed from the stripper plate 30, the stripper plate 30 is lowered by the plurality of return springs 82, (20).

The upper surface of the stripper plate 30 may be provided with an upper concave portion 33 corresponding to the upper projecting portion 13 provided on the upper plate 10. The upper projection 13 of the upper plate 10 is inserted into the upper concave portion 33 of the stripper plate 30 when the stripper plate 30 contacts the upper plate 10. [

A lower protrusion 35 corresponding to the lower recess 23 provided on the upper surface of the lower plate 20 may be formed on the lower surface of the stripper plate 30. The lower projection 35 of the stripper plate 30 is inserted into the lower concave portion 23 of the lower plate 20 when the stripper plate 30 and the lower plate 20 are in contact with each other.

Therefore, in the injection molding apparatus 1 according to the present invention, the upper plate 10 and the stripper plate 30 are coupled to each other by the upper protrusion 13 and the upper recess 33, and the stripper plate 30, The lower mold half 20 and the lower mold half 20 are coupled to each other by the lower protrusion 35 and the lower recess 23 so that the lower mold 21 is prevented from moving laterally even when a high pressure is applied to the cavity 3 .

The first insert core plate 40 is provided below the lower die plate 20 so as to be movable in a direction perpendicular to the lower die plate 20. Specifically, the first insert core plate 40 can be moved in close contact with or spaced from the lower surface of the lower plate 20, and the up and down movement of the first insert core plate 40 can be achieved by the four support bars 70, Lt; / RTI >

The first insert core plate (40) is provided with a first insert core (41). The first insert core 41 is formed to be inserted into the core hole 22 of the lower die 21 through the lower die plate 20. The first insert core 41 is coupled to the lower mold 21 to form a part 3a of the cavity 3. [ The first insert core 41 may form a portion 5a protruding into the inside of the injection mold 5.

The second insert core plate 50 is installed below the first insert core plate 40 so as to be movable in a direction perpendicular to the first insert core plate 40. Specifically, the second insert core plate 50 can be moved in close contact with or spaced from the lower surface of the first insert core plate 40, and the up and down movement of the second insert core plate 50 can be achieved by the above- (70).

The lower surface of the second insert core plate 50 is fixed to the moving clamping plate 102 of the injector 100. Therefore, when the movable clamping plate 102 of the injector 100 moves, the second insert core plate 50 also moves together.

3C and 4C, a plurality of springs 53 are provided between the upper surface of the second insert core plate 50 and the lower surface of the first insert core plate 40 described above. The plurality of springs 53 allow the second insert core plate 50 to be spaced first from the first insert core plate 40 when the moving clamping plate 102 of the injector 100 moves.

The second insert core plate (50) is provided with a second insert core (51). The second insert core (51) is formed to be inserted into the first insert core (41) through the first insert core plate (40). Specifically, the second insert core 51 is inserted into the first insert core 41 described above, and is slidably movable relative to the first insert core 41. Therefore, the second insert core 51 can be inserted into the lower surface of the first insert core 41, and the insert hole 42 passing through the first insert core 41 is provided.

The second insert core 51 is joined to the lower mold 21 together with the first insert core 41 to form a part 3b of the cavity 3. [ The second insert core 51 may form a portion 3b projecting inwardly of the injection mold 5 together with the first insert core 41. [

A plurality of link members (60) are provided to connect the upper plate (10) and the lower plate (20). Two link members 60 are provided in parallel on one side of the upper plate 10 and two link members 60 are provided on the opposite side of the upper plate 10 in parallel.

Each of the plurality of link members 60 includes an upper link 61 fixed to the upper plate 10 and a lower link 63 fixed to the lower plate 20. [ The upper link 61 and the lower link 63 are formed such that the lower portion of the upper link 61 and the upper portion of the lower link 63 overlap with each other when the upper plate 10 and the lower plate 20 are in contact with each other Respectively. A guide groove 62 having a predetermined length in the longitudinal direction of the upper link 61 is formed in the upper link 61. The length of the guide groove 62 is formed to be equal to the moving distance of the lower plate 20. A guide protrusion 64 inserted into the guide groove 62 of the upper link 61 and moving along the guide groove 62 is provided at the upper end of the lower link 63. Therefore, when the upper plate 10 and the lower plate 20 are in contact with each other, the guide protrusion 64 of the lower link 63 is positioned at the upper end of the guide groove 62 of the upper link 61. When the lower plate 20 is completely separated from the upper plate 10, the guide protrusion 64 of the lower link 63 is positioned at the lower end of the guide groove 62 of the upper link 61.

Although the guide groove 62 is formed in the upper link 61 and the guide protrusion 64 is provided in the lower link 63 in the present embodiment, the opposite case is also possible. That is, it is also possible to provide a guide protrusion at the tip of the upper link 61 and form a guide groove in the lower link 63.

As described above, the injection mold apparatus 1 for a thin-walled product according to an embodiment of the present invention includes the upper plate 10, the lower plate 20, the stripper plate 30, the first insert core plate 40, And the second insert core plate 50 are detachable from each other. Specifically, as the movable clamping plate 102 of the injector 100 moves, the gap between the top plate 10 and the stripper plate 30, between the stripper plate 30 and the bottom plate 20, between the bottom plate 20, Between the first insert core plate 40 and the first insert core plate 40 and between the first insert core plate 40 and the second insert core plate 50 are detachable.

In the injection mold apparatus 1 for a thin-walled product according to the embodiment of the present invention, the lower mold plate 20 is provided with a plurality of protrusions (not shown) so as to smoothly take out the injection molds 5 and avoid problems such as cracking, folding, The stripper plate 30, the first insert core plate 40, and the second insert core plate 50 are separated in a predetermined order.

For this purpose, the separating force between the lower die plate 20, the stripper plate 30, the first insert core plate 40, and the second insert core plate 50 is formed differently. Here, the separation force refers to the force required to separate two adjacent members. For example, the separating force between the first insert core plate 40 and the second insert core plate 50 refers to the force required to separate the second insert core plate 50 from the first insert core plate 40 .

Specifically, the first separating force F1 between the first insert core plate 40 and the second insert core plate 50 is greater than the second separating force F2 between the upper plate 10 and the stripper plate 30, Is smaller than the third separation force F3 between the plate 20 and the first insert core plate 40 and the fourth separation force F4 between the stripper plate 30 and the lower plate 20. [ That is, the first separation force F1 between the first insert core plate 40 and the second insert core plate 50 is determined so that F1 < F2, F3, F4.

The second separating force F2 between the upper plate 10 and the stripper plate 30 is greater than the third separating force F3 between the lower plate 20 and the first insert core plate 40, Is smaller than the fourth separation force (F4) between the plates (20). That is, the second separation force F2 between the upper plate 10 and the stripper plate 30 is determined so that F1 <F2 <F3, F4.

The third separating force F3 between the lower die plate 20 and the first insert core plate 40 is formed to be smaller than the fourth separating force F4 between the stripper plate 30 and the lower die plate 20. [ That is, the third separation force F3 between the lower die plate 20 and the first insert core plate 40 is determined so that F1 <F2 <F3 <F4. That is, the fourth separating force F4 between the stripper plate 30 and the lower die plate 20 is set to be larger than the third separating force F3 between the lower die plate 20 and the first insert core plate 40.

The fourth separation force F4 between the stripper plate 30 and the lower plate 20 is greater than the first separation force F1 between the first insert core plate 40 and the second insert core plate 50, The second separation force F2 between the lower die plate 10 and the stripper plate 30 and the third separation force F3 between the lower die plate 20 and the first insert core plate 40. [

Hereinafter, the operation of the injection mold apparatus 1 for a thin-walled product according to one embodiment of the present invention will be described in detail with reference to FIGS. 3A to 7C.

3A to 3C are views showing a state before an injection mold apparatus for a thin-walled product according to an embodiment of the present invention is started. 4A to 4C are views showing a state in which a second insert core plate is separated from a first insert core plate in an injection mold apparatus for a thin-walled product according to an embodiment of the present invention. 5A and 5B are views showing a state in which a lower mold plate is separated from an upper mold in an injection mold apparatus for a thin-walled product according to an embodiment of the present invention. 6A to 6C are views showing a state in which a first insert core plate is separated from a lower mold plate in an injection mold apparatus for a thin-walled product according to an embodiment of the present invention. 7A to 7C are front views showing a state in which a stripper plate is operated in an injection mold apparatus for a thin-walled product according to an embodiment of the present invention.

First, as shown in Fig. 2, the upper plate 10, the stripper plate 30, the lower plate 20, the first insert core plate 40, and the second insert core plate 50 are in contact with each other An injection mold apparatus 1 for a thin-walled product according to an embodiment of the present invention is mounted between a fixed clamping plate 101 of the injector 100 and a movable clamping plate 102. [

At this time, as shown in Figs. 3B, 9 and 10A, the upper die 11, the lower die 21, the stripper plate 30, the first insert core 41 and the second insert core 51 are manufactured A cavity 3 corresponding to the injection molded article 5 to be molded is formed. In this state, the injector 100 performs an injection operation of injecting molten plastic or resin, which is an injection material, into the cavity 3 through a hot runner system provided in the upper plate 10.

After the completion of the injection of the molten plastic or resin into the cavity 3, a certain cooling time has elapsed, the stripper plate 30, the lower mold plate 20, the first insert core plate 40 and the second insert core plate 50 are moved to take out the molded article 5 from the cavity 3.

Specifically, when the movable clamping plate 102 of the injector 100 moves in the direction of arrow A in FIG. 2, the second insert core plate 50 fixed to the movable clamping plate 102 moves in the direction of arrow A .

A plurality of springs 52 are provided between the second insert core plate 50 and the first insert core plate 40 so that the second insert core plate 50 Since the first separating force F1 between the first insert core plate 40 and the first insert core plate 40 is the smallest, the second insert core plate 50 first falls off the first insert core plate 40. 4B, when the second insert core plate 50 is separated from the first insert core plate 40, the second insert core 51 is inserted into the insert hole 42 of the first insert core 41, And is spaced apart from the portion 5b of the injection molded article 5. [ Therefore, since the force acting between the second insert core 51 and the injection object 5 is removed, the required output power for extracting the injection object 5 can be reduced.

When the movable clamping plate 102 continues to move in the A direction with the second insert core plate 50 at a certain distance from the first insert core plate 40, The plate 30 is separated from the upper plate 10. Therefore, the first insert core plate 40, the lower die plate 20, and the stripper plate 30 move together in the A direction without being separated. This is because the second separating force F2 between the stripper plate 30 and the upper plate 10 is greater than the first separating force F1 between the first insert core plate 40 and the second insert core plate 50, Is smaller than the third separation force F3 between the insert core plate 40 and the lower die plate 20 and the fourth separation force F4 between the stripper plate 30 and the lower die plate 20. [ When the stripper plate 30 is separated from the upper plate 10 as described above, the upper die 11 is separated from the injection product 5, so that the injection product 5 is exposed to the outside in a state sandwiched by the lower die 21.

The lower die plate 20, the stripper plate 30 and the first insert core plate 40 are arranged such that when the guide projections 64 of the lower link 63 are engaged with the lower ends of the guide grooves 62 of the upper link 61 The movable clamping plate 102 moves in the A direction.

When the guide protrusion 64 of the lower link 63 is caught by the lower end of the guide groove 62 of the upper link 61, the first insert core plate 40 is then detached from the lower plate 20. That is, when only the first insert core plate 40 is moved by the moving clamping plate 102 and the first insert core plate 40 is separated from the lower die plate 20 by a predetermined distance in a state where the lower die plate 20 is fixed do. Then, the moving clamping plate 102 does not move in the A direction any more. 6B, when the first insert core plate 40 is separated from the lower die plate 20 by a predetermined distance, the first insert core 41 is inserted into the core hole 22 of the lower die 21 to have a predetermined length So that the upper portion of the first insert core 41 is separated from the portion 5a of the injection mold 5. Therefore, since the force acting between the first insert core 41 and the injection object 5 is additionally removed, the required output power for extracting the injection object 5 can be further reduced.

Thereafter, air is injected toward the injection molding 5 through the air injection port 25 provided in the lower mold 21. [ Then, the vacuum state formed between the injection mold 5 and the lower mold 21 formed in the cavity 3 during the injection process can be released. If the vacuum state of the cavity 3 is destroyed as described above, it is possible to further reduce the amount of power required to take out the molded article 5.

Thereafter, as shown in Fig. 7C, the eject rod 80 is operated to move the stripper plate 30 provided on the upper surface of the lower plate 20 in the direction of the arrow B opposite to the direction A. When the stripper plate 30 moves in the B direction, the injection product 5 is separated from the lower mold by a certain length by the stripper plate 30, as shown in Fig. 7B. At this time, the slide core 31 also moves away from the lower die 21, so that the lower die 21 can be detached from the lower die 21.

As described above, the injection mold apparatus 1 for a thin-walled product according to the embodiment of the present invention is configured such that the second insert core 51 and the first insert core 41, which are provided inside the lower mold 21, The injection product 5 is separated by the stripper plate 30, so that the discharge power is reduced, thereby preventing whitening, breakage, and the like occurring in the production of the thin-walled product.

The injection mold apparatus 1 for a thin-walled product according to an embodiment of the present invention is characterized in that the injection molding apparatus 1 for molding a thin material is provided between the lower mold 21 and the injection mold 5 before the injection mold 5 is separated from the lower mold 21 by the stripper plate 30. [ By blowing in air to break the vacuum, the output power can be reduced. Therefore, it is possible to solve problems such as whitening, breakage, and the like which occur when a thin-walled product is injected.

Although the above description has been made with respect to an injection mold apparatus which can be used to inject thin inserts requiring two insert cores, i.e., a first insert core and a second insert core, the present invention is not limited to the use of two insert cores It is not applicable only to an injection mold apparatus which produces an injection molding. The present invention can be applied to the case of using one insert core. In this case, the second insert core plate provided with the second insert core may not be used. Thus, the first insert core plate is fixed to the moving clamp plate of the injector.

The present invention can also be applied to an injection mold apparatus for producing an injection product using three or more insert cores. In this case, three or more insert core plates may be used. For example, in the case of an injection mold apparatus using three insert cores, the first, second, and third insert core plates are installed in an overlapping manner, and can be installed so as to be individually movable.

The present invention has been described above by way of example. The terms used herein are for the purpose of description and should not be construed as limiting. Various modifications and variations of the present invention are possible in light of the above teachings. Therefore, unless otherwise indicated, the present invention may be practiced freely within the scope of the claims.

One; Injection mold apparatus 10 for thin meat products; Senate version
11; Topography 20; Lower plate
21; Lower mold 22; Core hole
30; A stripper plate 31; Slide core
40; A first insert core plate 41; The first insert core
42; Insert hole 50; The second insert core plate
51; A second insert core 53; spring
60; Link member 61; Upper link
62; Guide grooves 63; Lower link
64; A guide projection 70; Support bar
80; An eject rod 82; Return spring
100; Injector 101; Fixed clamping plate
102; Moving clamping plate

Claims

An injection mold apparatus for a thin-walled product, which is provided in an injection molding machine and forms an injection molding product,
A top plate installed on a fixed clamping plate of the injector and having a hot runner system therein;
A top mold installed on the upper plate;
A lower mold installed to be movable with respect to the upper mold and including a lower mold coupled to the upper mold to form a cavity corresponding to the upper mold;
A stripper plate installed movably above the lower mold plate and pushing up the injection molding when the upper mold is separated from the lower mold;
A first insert core plate movably installed below the lower mold plate and including a first insert core penetrating the lower mold plate and coupled to the lower mold to form a part of the cavity; And
And a plurality of link members connecting the upper plate and the lower mold plate.

The method according to claim 1,
A second insert core plate movably disposed below the first insert core plate and including a second insert core penetrating the first insert core plate to be coupled to the lower die to form a part of the cavity; Further comprising an injection molding apparatus for a thin-walled product.

The method according to claim 1,
Wherein a plurality of springs are provided between the first insert core plate and the second insert core plate.

The method of claim 3,
And a separating force between the first insert core plate and the second insert core plate,
The separating force between the upper mold and the stripper plate, the separating force between the stripper plate and the lower mold plate, and the separating force between the lower mold plate and the first insert core plate.

5. The method of claim 4,
The separating force between the upper mold and the stripper plate,
Wherein the separating force between the lower plate and the lower insert plate is smaller than the separating force between the lower plate and the lower insert plate and the separating force between the lower plate and the first insert core plate.

6. The method of claim 5,
The separating force between the stripper plate and the lower mold plate,
Is greater than the separating force between the lower mold plate and the first insert core plate.

The method according to claim 6,
Wherein the stripper plate is separated from the lower plate by an eject rod.

The method according to claim 1,
Wherein at least one air injection port is formed at an upper end of the lower mold so as to inject air into the cavity.

The method according to claim 1,
An upper protrusion is formed on a lower surface of the upper plate to surround the upper mold,
And an upper concave portion corresponding to the upper protrusion is formed on an upper surface of the stripper plate.

The method according to claim 1,
A lower concave portion is formed on the upper surface of the lower mold plate around the lower mold,
And a lower protrusion corresponding to the lower concave portion is formed on a lower surface of the stripper plate.

The method according to claim 1,
Wherein each of the plurality of link members includes:
An upper link fixed to the upper plate; And
And a lower link fixed to the lower plate,
Wherein a guide groove is formed in one of the upper link and the lower link in a longitudinal direction and a guide protrusion is provided at the tip of the other of the upper link and the lower link to be inserted and moved in the guide groove. Injection mold device.

An injection mold apparatus for a thin-walled product, which is provided in an injection molding machine and forms an injection molding product,
A top plate installed on one clamping plate of the injector and having a hot runner system therein;
A top mold installed on the upper plate;
A lower mold installed to be movable with respect to the upper mold and including a lower mold coupled to the upper mold to form a cavity corresponding to the upper mold;
A stripper plate installed movably above the lower mold plate and pushing up the injection molding when the upper mold is separated from the lower mold;
A first insert core plate movably installed below the lower mold plate and including a first insert core penetrating the lower mold plate and coupled to the lower mold to form a part of the cavity;
A second insert core plate movably disposed below the first insert core plate and including a second insert core penetrating the first insert core plate to be coupled to the lower die to form a part of the cavity; And
And a plurality of link members connecting the upper plate and the lower plate,
Wherein the mold insert of the injection molding machine is firstly separated from the second insert core plate and the first insert core plate.

13. The method of claim 12,
Wherein a plurality of springs are provided between the first insert core plate and the second insert core plate.

14. The method of claim 13,
And a separating force between the first insert core plate and the second insert core plate,
The separating force between the upper mold and the stripper plate, the separating force between the stripper plate and the lower mold plate, and the separating force between the lower mold plate and the first insert core plate.

15. The method of claim 14,
The separating force between the upper mold and the stripper plate,
Wherein the separating force between the lower plate and the lower insert plate is smaller than the separating force between the lower plate and the lower insert plate and the separating force between the lower plate and the first insert core plate.

16. The method of claim 15,
The separating force between the stripper plate and the lower mold plate,
Is greater than the separating force between the lower mold plate and the first insert core plate.

13. The method of claim 12,
And an air injection path is formed at an upper end of the lower mold.

13. The method of claim 12,
Wherein each of the plurality of link members includes:
An upper link fixed to the upper plate; And
And a lower link fixed to the lower plate,
Wherein a guide groove is formed in one of the upper link and the lower link in a longitudinal direction and a guide protrusion is provided at the tip of the other of the upper link and the lower link to be inserted and moved in the guide groove. Injection mold device.

The injection molding method of the injection molding machine for thin-walled products according to any one of claims 12 to 18,
Moving the second insert core plate in a first direction and separating the first insert core plate from the first insert core plate;
The second insert core plate, the first insert core plate, the lower die plate, and the stripper plate move together in the first direction to separate the stripper plate from the upper die;
The second insert core plate and the first insert core plate move together in the first direction to separate the first insert core plate from the lower plate;
Blowing air into the cavities formed between the upper and lower molds;
And moving the stripper plate in a second direction opposite to the first direction to separate the stripper plate from the lower plate.

20. The method of claim 19,
Wherein the distance that the stripper plate moves in the upper mold is limited by the plurality of link members.