KR20230077855A - Injection mold - Google Patents

Abstract

The present invention core; a first cavity forming a cavity space together with the core and having at least one groove formed thereon; a second cavity formed with the first cavity to form an accommodation space in the groove; and a heater disposed in the accommodation space.

Description

Mold for injection molding {Injection mold}

The present invention relates to a mold for injection molding.

Uniform heat supply around the cavity space in molds that are molded using resin raw materials is an important factor in reducing the defect rate of products. If the heat supply is not performed properly, it becomes difficult to produce a product that maintains uniformity in appearance.

For uniform heat supply, the mold temperature can be set high when the molten resin is filled in the mold and holding pressure is applied after the filling, but increasing the mold temperature requires that much time for the next cooling process, resulting in poor molding performance. cycles become longer. In addition, since the molded article cannot be cooled sufficiently, a problem arises in release from the mold.

Therefore, it is necessary to develop a method for heating the periphery of the cavity space of the mold only while filling the mold with the molten resin.

Publication No. 2001-0001514

In order to solve the above problems, an object of the present invention is to provide a structure for heating the periphery of a cavity space of a mold.

The tasks of the present invention are not limited to the tasks mentioned above, and other tasks not mentioned will be clearly understood by those skilled in the art from the following description.

In order to achieve the above object, the mold for injection molding according to an embodiment of the present invention provides an accommodation space and arranges a heater in the accommodation space.

A mold for injection molding according to an embodiment of the present invention includes a core; a first cavity forming a cavity space together with the core and having at least one groove formed thereon; a second cavity formed with the first cavity to form an accommodation space in the groove; and a heater disposed in the accommodation space.

The second cavity includes a protruding portion having a protruding length smaller than a depth of the groove.

The protruding portion is formed to be tapered as it moves away from the main body of the second cavity.

The outer surface of the protruding part forms a gap within a predetermined range by being spaced apart from the inner surface of the groove in a state of being inserted into the groove.

The cavity space is composed of a first space for molding the upper part of the product and a second space for molding the side part of the product, and the heater is disposed spaced apart from the first space by a predetermined distance, The first cavity is spaced apart from the second space by a preset distance.

Details of other embodiments are included in the detailed description and drawings.

According to the present invention, there is one or more of the following effects.

First, there is an effect of continuously producing good products by arranging heaters or steam lines around the cavity space.

Second, by forming the protruding part tapered and leaving a gap between the protruding part and the groove, it is possible to work easily when assembling the mold, and there is an effect that disassembly is easy during repair even in a state where there is thermal damage.

Third, by forming the protruding portion tapered and leaving a gap between the protruding portion and the groove, there is an effect of preventing damage to the mold due to thermal expansion.

The effects of the present invention are not limited to the effects mentioned above, and other effects not mentioned will be clearly understood by those skilled in the art from the description of the claims.

1 is a view showing a cutaway portion of a mold according to an embodiment of the present invention.
2 is a cross-sectional view of a mold according to an embodiment of the present invention.

Hereinafter, the embodiments disclosed in this specification will be described in detail with reference to the accompanying drawings, but the same or similar elements are given the same reference numerals regardless of reference numerals, and redundant description thereof will be omitted. The suffixes "module" and "unit" for components used in the following description are given or used together in consideration of ease of writing the specification, and do not have meanings or roles that are distinct from each other by themselves. In addition, in describing the embodiments disclosed in this specification, if it is determined that a detailed description of a related known technology may obscure the gist of the embodiment disclosed in this specification, the detailed description thereof will be omitted. In addition, the accompanying drawings are only for easy understanding of the embodiments disclosed in this specification, the technical idea disclosed in this specification is not limited by the accompanying drawings, and all changes included in the spirit and technical scope of the present invention , it should be understood to include equivalents or substitutes.

Terms including ordinal numbers, such as first and second, may be used to describe various components, but the components are not limited by the terms. These terms are only used for the purpose of distinguishing one component from another.

It is understood that when an element is referred to as being "connected" or "connected" to another element, it may be directly connected or connected to the other element, but other elements may exist in the middle. It should be. On the other hand, when an element is referred to as “directly connected” or “directly connected” to another element, it should be understood that no other element exists in the middle.

Singular expressions include plural expressions unless the context clearly dictates otherwise.

In this application, terms such as "comprise" or "have" are intended to designate that there is a feature, number, step, operation, component, part, or combination thereof described in the specification, but one or more other features It should be understood that the presence or addition of numbers, steps, operations, components, parts, or combinations thereof is not precluded.

1 is a view showing a cutaway portion of a mold according to an embodiment of the present invention.

2 is a cross-sectional view of a mold according to an embodiment of the present invention.

Referring to the drawings, the mold 100 according to an embodiment of the present invention may be a mold used for injection molding of a thermoplastic resin or a thermosetting resin. The mold 100 may produce products according to processes such as mold closing, injection, packing, cooling, mold opening, and product extraction. The mold 100 may basically include a known mold configuration.

In the mold 100 according to the embodiment of the present invention, the heater 130 can be installed by sufficiently approaching the cavity space. Due to this, it is possible to rapidly heat the mold to the required temperature without uneven temperature rise. In addition, the occurrence rate of defective products can be reduced without lengthening the molding cycle.

The mold 100 may include a fixed-side mold and a movable-side mold that moves to freely open and close with respect to the fixed-side mold. The fixed-side mold may include a first cavity 110 and a second cavity 120 and a heater 130 . The movable side mold may include the core 200 .

The mold 100 may include a core 200 , a first cavity 110 , a second cavity 120 and a heater 130 .

The core 200 may form a cavity space together with the first cavity 110 . On the other hand, the cavity space may be understood as a space in which a molten resin raw material is introduced to mold a product.

The first cavity 110 may form a cavity space together with the core 200 . The first cavity 110 may have at least one groove 111 provided thereon. The groove may be described as for accommodating the heater 130 .

The number of grooves 111 and the shape of the grooves 111 may be determined according to the size of the product. For example, when the area of the product has a first value, the number of grooves 111 may be increased compared to a case where the area of the product has a second value smaller than the first value. For example, when the area of the product has a first value, the groove 111 may have a greater depth than when the product has a second value smaller than the first value.

The number of grooves 111 and the shape of the grooves 111 may be determined according to the thickness of the product. For example, when the average thickness of the product is the first value, the number of grooves 111 may be increased compared to the case where the average thickness of the product is the second value smaller than the first value. For example, when the product has an average thickness of the first value, the depth of the groove 111 may be greater than that of the second value smaller than the first value.

The number of grooves 111 and the shape of the grooves 111 may be determined according to the shape of the product.

At least one of both inner surfaces of the groove 111 may form an acute angle (eg, 95 degrees) with the ground surface. That is, at least one of both inner surfaces of the groove 111 may be inclined with respect to the ground surface.

The second cavity 120 may be located above the first cavity 110 . The second cavity 120 may be matched with the first cavity 110 such that an accommodation space is formed in the groove 111 .

The second cavity 120 may include a body and a protrusion 121 protruding from the body toward the first cavity 110 .

In the protrusion 121 , the protrusion length may be smaller than the depth of the groove 111 . Due to this, in a state where the protrusion 121 is inserted into the groove 111, an accommodation space is formed below the protrusion 121.

The protrusion 121 may be inserted into the groove 111 while the heater 130 is inserted into the groove 111 . The heater 130 may be constrained by the protrusion 121 while being inserted into the groove 111 .

The protrusion 121 may have a shape corresponding to the shape of the groove 111 .

The protrusion 121 may be formed to be tapered as it moves away from the main body of the second cavity 120 . The protrusion 121 may be formed to be tapered downward. In a state where the first cavity 110 and the second cavity 120 are molded, the protrusion 121 may be formed to be tapered toward the accommodation space.

As the protrusion 121 is further away from the main body of the second cavity 120, the longitudinal cross-sectional area may decrease. A longitudinal cross-sectional area of the protrusion 121 may decrease as it goes downward.

At least one surface of the protrusion 121 may form an acute angle (eg, 95 degrees) with the ground surface. That is, at least one of both outer surfaces of the protrusion 121 may be inclined with respect to the ground surface.

When the groove 111 and the protrusion 121 have a shape perpendicular to the ground surface, not only is it difficult to assemble the first cavity 110 and the second cavity 120, but also repair is difficult due to thermal expansion or thermal damage. There is a problem in that the disassembly of the first cavity 110 and the second cavity 120 becomes difficult when necessary.

According to the embodiment of the present invention, the first cavity 110 and the second cavity 120 are formed by forming an inclination with respect to the ground surface and the protrusion 121 having a shape corresponding to the groove 111. It has the advantage of being easy to assemble. In addition, when the mold 100 is repaired, there is an advantage in that the disassembly of the first cavity 110 and the second cavity 120 becomes easy.

The outer surface of the protrusion 121 may form a gap within a predetermined range by being spaced apart from the inner surface of the groove 111 in a state of being inserted into the groove 111 . For example, the gap may be 0.15 mm.

The part of the groove 111 and the protruding part 121 inserted into the groove 111 is a part that does not need to consider water leakage, and may have a gap. By leaving the gap, damage to the first cavity 110 or the second cavity 120 can be prevented when thermal expansion occurs.

The heater 130 may be an electric heater. The heater 130 may be disposed in an accommodation space prepared while the protrusion 121 is inserted into the groove 111 .

형상의 단면을 가질 수 있다. 이경우, 캐비티 공간은, 제1 공간 및 제2 공간으로 구성될 수 있다. 제1 공간은, 제품(PART)의 상부를 성형하기 위한 공간이고, 제2 공간은 제품(PART)의 측부를 성형하기 위한 공간일 수 있다.The product (PART) according to the embodiment of the present invention,

It may have a cross section of a shape. In this case, the cavity space may consist of a first space and a second space. The first space may be a space for molding the upper part of the product (PART), and the second space may be a space for molding the side part of the product (PART).

The heater 130 may be disposed around the first space. For example, when the core 200, the first cavity 110, and the second cavity 120 are in close contact, the heater 130 moves upward at a predetermined distance (a, for example, 5 mm) in the first space. ) may be spaced apart from each other. Here, the distance is for minimizing the defective rate of the product (PART), and may be determined through an experiment.

A steam line 300 may be disposed around the second space. The first cavity 110 may have a steam line 300 formed therein. The steam line 300 may be formed to be spaced apart by a preset distance in the second space.

형상의 제품(PART에서 상부에 대응되는 제1 공간 주변에는 히터(130)를 배치할 수 있지만, 측부에 대응되는 제2 공간에는 히터(130)를 구조상 히터를 배치하도록 제1 캐비티(110) 및 제2 캐비티(120)를 가공할 수 없다. 제2 공간 주변에 스팀라인(300)을 배치함으로써, 제품(PART)의 상부와 측부 모두에 균일한 열을 제공할 수 있게 된다.

Although the heater 130 can be placed around the first space corresponding to the upper part in the shaped product (PART), the heater 130 is structurally placed in the second space corresponding to the side of the first cavity 110 and It is impossible to process the second cavity 120. By arranging the steam line 300 around the second space, it is possible to provide uniform heat to both the upper and side parts of the product (PART).

Meanwhile, the steam line 300 may function as a cooling water channel. When the mold 100 is heated, steam may be supplied through the steam line 300, and when cooled, cooling water may be supplied through the steam line 300.

The above detailed description should not be construed as limiting in all respects and should be considered illustrative. The scope of the present invention should be determined by reasonable interpretation of the appended claims, and all changes within the equivalent scope of the present invention are included in the scope of the present invention.

100: mold
110: first cavity
111: home
112: protrusion
120: second cavity
130: heater
200: mold
300: steam line

Claims (5)

core;
a first cavity forming a cavity space together with the core and having at least one groove formed thereon;
a second cavity formed with the first cavity to form an accommodation space in the groove; and
A mold for injection molding including a heater disposed in the accommodation space. According to claim 1,
The second cavity,
A mold for injection molding comprising a protrusion having a protrusion length smaller than the depth of the groove. According to claim 2,
the protrusion,
A mold for injection molding that is formed so that the second cavity becomes tapered as it moves away from the body of the second cavity. According to claim 2,
The outer surface of the protrusion,
An injection mold for forming a gap within a predetermined range by being spaced apart from the inner surface of the groove in a state inserted into the groove. According to claim 1,
The cavity space is
It consists of a first space for molding the upper part of the product and a second space for molding the side part of the product,
the heater,
Disposed to be spaced apart by a predetermined distance in the first space,
The first cavity,
An injection molding mold having a steam line spaced apart from the second space by a predetermined distance therein.

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