KR101417621B1 - Injection mold having rapid heating and cooling flow path - Google Patents

Abstract

The present invention provides injection molds having rapid heating and cooling flow paths, which injection-mold an injection molded part where an dent portion is formed, comprising: a mold body forming a cavity, defined as an dent line and a non-dent line formed along the dent portion on a cross section, at a lower part to realize a forming space for the injection molded parts and forming a plurality of flow path recesses from one side to other side direction along a curve of the dent line over the cavity at an upper part; a plurality of curved flow path plates composed of long shaped plates, and inserted into and coupled to lower parts of flow path recesses, respectively to form curved flow paths at lower ends of the flow path recesses of the mold body, respectively; a plurality of fillers filled in insides of the flow path recesses of the mold body upward the curved flow path plates, respectively; and a body cover coupled and fixated to an upper part of the mold body to cover and seal upper parts of the fillers, wherein the mold body includes a plurality of first linear flow paths formed by penetrating through the inside from one side direction to the other side direction along a circumference of the non-dent line of the cavity; and a plurality of second linear flow paths formed by penetrating through the inside from one side direction to the other side direction to open into both ends of each curved flow path formed at a lower end of each flow path recess.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an injection mold having a rapid heating and cooling flow path,

The present invention relates to an injection mold having a rapid heating and cooling passage capable of quickly heating an injection mold and cooling it quickly.

Generally, injection molding refers to a molding method in which a molding material melted by heating in a cylinder is injected into a cavity of a mold closed at a high pressure, and cooled and solidified or cured to form an injection molded article corresponding to the shape formed in the cavity.

The injection mold is usually divided into a fixed side mold and a movable side mold. The mold includes a sprue receiving the molding material from the cylinder of the cylinder and injecting it into the mold, a runner communicating with the sprue and moving the molding material, a cavity substantially forming the molding space of the injection molded article, A gate is provided between the cavity and the runner to serve as a pouring path for the molding material.

That is, the plasticized and molten molding material is injected into the cavity through the sprue, the runner and the gate of the mold, and then cooled and solidified or cured to produce an injection molded article having a desired shape.

However, when the resin injected into the cavity of the mold is not completely melted and solidified, a weld line is formed, which is a kind of resin contact line. In order to remove such a weld line, it is necessary to sufficiently heat the mold at a temperature not lower than the glass transition temperature of the resin and inject the resin. If the temperature of the mold is increased as described above, the cooling time of the mold increases and the productivity of the product deteriorates.

Such a product formed with the weld line may conceal defects through post-processing such as painting, vapor deposition or plating, but the increase in product manufacturing cost due to the post-processing and the environmental pollution due to by-products in the post-processing process do.

2. Description of the Related Art In recent years, as demand for a product having a high-gloss appearance has increased rapidly, researches have been actively carried out to secure both the formability of a product and the excellence of a product appearance through rapid heating and cooling.

For example, a method of directly heating an electric heating element by inserting an electric heating element into the mold has been commercialized. However, since the cooling rate of the mold is slow, the production efficiency of the product is lowered due to an increase in the cooling time. However, the heating performance varies depending on the distance between the induction coil and the surface of the mold, so that it is generally difficult to apply to an injection molded article having a curved surface.

Therefore, the most commonly used rapid heating and cooling method of a mold is to form a plurality of flow paths in the mold, supply the high-temperature and high-pressure steam through the flow path to rapidly heat the mold, and supply coolant or water to the mold This is a rapid cooling method.

As shown in FIG. 1, when the shape of the article of manufacture 1 is a flat cube, a thin plate, or a small size, an injection mold having rapid heating and cooling flow paths according to the prior art shown in FIG. Do. That is, the plurality of linear flow paths 12 through which the heat transfer medium moves are formed to pass through the inside of the injection mold 10 from one side to the other along the circumference of the cavity 11.

However, in the case of forming a printing article 1 having a depression 1a on one side as shown in Fig. It is difficult to prevent the weld line of the article of manufacture 1 with an injection mold having rapid heating and cooling flow paths. This is because the linear flow path 12 in which the heat transfer medium moves in the injection mold 10 in which the concave portion 1a is formed in the cavity 11 is formed into a curved shape like the circumferential shape of the concave portion 1a of the cavity 11 10 can not be formed. That is, although it can be formed as a straight line through the linear flow path 12 of the metal mold 10 by drilling, there arises a problem that it can not penetrate along the curve. This is because the temperature of the mold 10 in contact with the depressed portion 1a of the cavity 11 is inevitably lowered and the temperature of the mold 10 in contact with the depressed portion 1a of the cavity 11 is lowered and the product quality is affected by the temperature deviation of the resin injected into the cavity 11 It will have an adverse effect.

A flow path is formed inside the mold 10 along the circumference of the depressed portion 1a at the time of molding the article 1 formed with the depressed portion 1a as described above so that the temperature deviation of the resin injected into the cavity 11 There is an injection mold 10 in which a curved flow path 13 is formed as shown in FIGS.

That is, a cavity 11 defined by a depressed line 11a and a non-depressed line 11b formed along the depressed portion 1a on the cross section is formed at the bottom to form a molding space of the article 1, A core body 20 in which a core engaging groove 21 is recessed upward along a curve of the recessed line 11a upwardly of the core body 11, And a bottom surface of the mold core (30) which is in contact with the bottom surface of the core coupling groove (21) of the mold main body (20) The mold body 20 is formed with a plurality of first rectilinear flow paths 13 formed in the other direction from one side to the other along the circumference of the non-recessed line 11b of the cavity 11, (12a), and one end of each of the curved flow paths (13) A plurality of second linear passage (12b) formed to penetrate the interior further comprises.

In the case of the conventional injection mold having the rapid heating and cooling flow path according to the above-described structure, the core body 20 is provided with the core coupling 20 in order to form the curved flow path 13 along the recessed line 11a of the first depression 1a. The thickness of the mold body 20 between the core coupling groove 21 and the recessed line 11a of the cavity 11 is reduced and the rigidity is lowered and the core is easily broken. Since the curved flow path 13 is formed between the bottom surface of the mold core 21 and the bottom surface of the mold core 30, it is very difficult to precisely process the curved flow path 13, In particular, due to the difficulty in machining the curved surface, high-pressure steam or refrigerant leaks out along the surface between the core coupling groove 21 and the mold core 30 through the curved flow path 13, And adversely affects the quality of the finished product.

SUMMARY OF THE INVENTION It is an object of the present invention, which has been devised to solve the problems as described above, to improve the rigidity of a mold body when forming a curved flow path in a mold body, And an injection mold having a rapid heating and cooling flow path that can be prevented from occurring.

Other objects, specific advantages and novel features of the present invention will become more apparent from the following detailed description and preferred embodiments with reference to the accompanying drawings.

In order to accomplish the above object, an injection mold having a rapid heating and cooling flow path according to the present invention is characterized by comprising: an injection mold having a rapid heating and cooling flow path for injection molding a raw material with a depression formed therein; Wherein a cavity defined by a recessed line and a non-recessed line is formed at a lower portion so as to form a molding space of the article of manufacture, and a plurality of flow grooves are formed in the upper portion along the curve of the recessed line, A plurality of curved flow path plates inserted into and fixedly coupled to a lower portion of each of the flow path grooves so as to form a curved flow path at a lower end of each of the flow path grooves of the mold body; A plurality of fillers which are filled upwardly in each of the flow grooves of the mold body; And a plurality of first linear flow paths formed in the other direction from the one side to the other along the circumference of the non-recessed line of the cavity, And a plurality of second rectilinear flow passages respectively formed in the one direction and the other direction so as to communicate with both ends of the curved flow path formed at the lower end of each of the flow grooves.

In addition, the mold body may have a stepped surface formed at a lower portion of each of the flow path grooves by widening each of the flow path grooves more widely than the respective flow path grooves, and the curved flow path plate is hooked to the stepped surface And is fixedly coupled.

Further, the curved flow path plate is characterized by being a copper alloy.

Further, the filling material is an epoxy resin.

In the injection mold having the rapid heating and cooling flow path according to the present invention, when forming the curved flow path in the mold body, a plurality of flow path grooves are formed to function as reinforcing fins according to the distance between the flow path grooves, It is possible to prevent leakage of steam or refrigerant from the source, and it is possible to prevent leakage of steam or refrigerant, which is tightly coupled through the curved flow path plate and the filler, .

Fig. 1 is a perspective view showing a flat cube-shaped article,
FIG. 2 is a cross-sectional view illustrating an injection mold having a rapid heating and cooling flow path according to a conventional technique for injection molding the article shown in FIG. 1,
Fig. 3 is a perspective view showing the article of manufacture formed with depressions,
FIG. 4 is a cross-sectional view showing another embodiment of an injection mold having a rapid heating and cooling flow path according to the prior art for injection molding the article shown in FIG. 3,
FIG. 5 is a sectional view showing an embodiment of an injection mold having a rapid heating and cooling flow path according to a related art having a curved flow path for injection molding the article shown in FIG. 3,
6 is a cross-sectional view taken along the line A-A 'in the embodiment of FIG. 5,
FIG. 7 is a sectional view of the mold body and the mold core of FIG. 5,
8 is a perspective view showing an embodiment of an injection mold having rapid heating and cooling flow paths according to the present invention,
9 is a cross-sectional view taken along a line B-B 'in the embodiment of FIG. 8,
10 is a plan view showing a linear flow path and a curved flow path formed through the inside of a mold body of the embodiment of FIG. 8,
11 to 15 are cross-sectional views illustrating a process of manufacturing an injection mold having rapid heating and cooling flow paths according to the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of an injection mold having rapid heating and cooling flow paths according to the present invention will be described in detail with reference to the accompanying drawings.

As shown in FIGS. 8 to 15, the injection mold having the rapid heating and cooling flow path according to the present invention has a rapid heating and cooling flow path for injecting and molding the article 1 having the depressed portion 1a formed therein, The mold body 100 includes a cavity 110 and a cavity 110. The cavity 110 includes a cavity 110 and a curved pathway 200. The cavity 110 includes a cavity 110, A plurality of flow path grooves 120 are formed in a recessed manner and a first linear flow path 500 and a second linear flow path 600 penetrating the inside are formed.

The mold body 100 is a mold in which a cavity 110 is provided so as to directly mold the article of manufacture 1 and a resin as a molding material is injected into the cavity 110 and may be either a stationary side or a movable side mold . 8 to 11, the mold body 100 includes a cavity 110 defined by a recessed line 111 formed along a recessed portion 1a of the article 1 and a non-recessed line 112, Is formed at the lower part to form a molding space of the article of manufacture 1. Since the cavity 110 is a space that is formed in the shape of the article 1, if the depression 1a is formed in the article 1, the cavity 110 is also in a state in which the depression 1a is formed do. At this time, the cavity 110 is one space, but it can be defined as a depressed line 111 and other non-depressed lines 112 along the depressed portion 1a as shown in Figs. 8 to 11. That is, the inner surface line of the cavity 110 corresponding to the depressed portion 1a is defined as the depressed line 111, and the inner surface line of the other cavity 110 is defined as the depressed depressed line 112.

8 to 11, the mold body 100 is moved upward along the curve of the depression line 111 to the upper side of the cavity 110 defined by the depression line 111 and the depression line 112, A plurality of flow grooves 120 are formed in the upper portion in the direction from one side to the other. That is, the plurality of flow grooves 120 are grooves formed by recessing the upper portion of the mold body 100 at regular intervals. The name of the flow grooves 120, not the holes, The cavity 110 is not penetrated to the cavity 110 but down along the curve of the recessed line 111 above the cavity 110. The lower ends of the plurality of flow grooves 120 are inserted into the curved flow path plate 200 to form a curved flow path 130.

8, 9, 13 and 14, the curved flow path plate 200 is formed in a long plate shape so that the curved flow path 130 is formed at the lower end of each of the flow path grooves 120 of the mold body 100 And is inserted and fixedly coupled to the lower portion of each of the flow grooves 120. The curved flow path plate 200 is a thin strip-shaped copper alloy having flexibility and easy bending. The curved flow path plate 200 is formed of a curved flow path 130, and is required to have corrosion resistance and oxidation resistance since it is in contact with steam or a refrigerant. When the curved flow path plate 200 is inserted into and fixedly connected to the lower portion of each of the flow path grooves 120 of the mold body 100, a curved flow path 130 And the curved flow path 130 serves as a flow path for the vapor or the coolant.

8, 9, and 12, so that the diameter of each curved flow path 130 can be kept constant when the curved flow path plate 200 is inserted into the flow path groove 120 to form the curved flow path 130, The stepped surfaces 121 are formed at the bottom of each of the flow path grooves 120 as shown in FIGS. That is, the mold main body 100 expands each of the flow path grooves 120 more widely than the respective flow path grooves 120 to form a step surface 121 at the bottom of each of the flow path grooves 120 And the curved flow path plate 200 is engaged with the stepped surface 121 to be fixedly coupled. In other words, when forming the flow grooves 120, a gap of the flow grooves 120 is formed by a milling cutter having a small interval corresponding to the diameter of the curved flow grooves 130 to break the grooves from the upper portion of the mold main body 100, (120) is extended at an interval larger than the diameter of the curved flow path (130), and when the curved flow path (130) is further lowered to the upper end of the curved flow path (130) (121) is formed. When the curved flow path plate 200 is engaged and fixed to the stepped surface 121, the diameters of the respective curved flow paths 130 can be made uniform. Particularly, It can be more conveniently fixed at the time of coupling.

The curved flow path plate 130 is formed at the lower end of the flow path groove 120 by inserting the curved flow path plate 200 into the flow path groove 120 of the mold body 100. At this time, the curved flow path plate 200 is tightly fixed and the filler 300 is filled in the flow path groove 120 so that steam or refrigerant flowing through the curved flow path 130 does not leak. 8, 9, and 14, a plurality of filler materials 300 are filled in the respective flow path grooves 120 of the mold body 100 above the respective curved flow path plates 200 . The filler 300 is a resin material such as an epoxy resin, and has fluidity before being cured, but functions as a filling member after being cured. That is, even if rubber or other hardened synthetic resin is pressed and inserted into the flow path groove 120, steam or refrigerant may permeate through the curved flow path 130 along the contact surface. However, in the state where the curved flow path plate 200 is supported, It is possible to reliably prevent the leakage phenomenon by filling the filling material 300 and curing it.

The curved flow path plate 200 is inserted into the flow path groove 120 of the mold body 100 to form the curved flow path 130 at the lower end of the flow path groove 120 and the filler 300 and then cover the main body cover 400 as shown in FIGS. 8, 9 and 15 so as to prevent the filler 300 from being separated from the upper side of the mold body 100. That is, the main body cover 400 is fixed to the upper portion of the mold body 100 to cover and seal the upper portion of the filler 300. Although not shown in the drawing, a separate member for preventing water leakage, such as an O-ring, may be interposed between the main body cover 400 and the mold body 100 when fixedly coupled.

In order to rapidly heat and cool the mold body 100 around the cavity 110, a flow path through which steam or a refrigerant moves must be formed inside the mold body 100. Since the curved flow path 130 is formed above the recessed line 111 of the cavity 110, a separate linear flow path and a non-recessed line 112 of the cavity 110 are formed so as to communicate with both ends of the curved flow path 130, A general linear flow path may be formed through the inside of the metal mold 100 from one side to the other. 8 to 10, the mold body 100 penetrates the inside of the cavity 110 in a direction from one side to the other along the circumference of the non-receding line 112 of the cavity 110, A plurality of second rectilinear flow paths 600 are formed so as to penetrate each of the first rectilinear flow path 600 and the second rectilinear flow path 600 in the one direction and the other direction so as to communicate with both ends of the curved flow path 130 formed at the lower end of each of the flow path grooves 120, . Since the first straight line 500 is formed along the periphery of the non-recessed line 112, the second straight line 600 may be formed by passing through both ends of the curved line 130, Are formed so as to pass through one side direction and the other side direction of the metal mold body 100, respectively.

As described above, the injection mold having the rapid heating and cooling flow path according to the present invention is formed by recessing the plurality of flow path grooves 120 when the curved flow path 130 is formed in the mold body 100, The reinforcing member 300 is filled with the reinforcing member 300 according to the distance between the reinforcing member 300 and the reinforcing member 300. Accordingly, the rigidity of the mold body 100 is increased and the curved surface processing is not required. The heat insulating performance of the steam or the refrigerant moving along the curved flow path 130 can be enhanced by being tightly coupled through the curved flow path plate 200 and the filler 300.

The embodiments of the present invention described above and shown in the drawings should not be construed as limiting the technical idea of the present invention. The scope of protection of the present invention is limited only by the matters described in the claims, and those skilled in the art will be able to modify the technical idea of the present invention in various forms. Accordingly, such improvements and modifications will fall within the scope of the present invention as long as they are obvious to those skilled in the art.

1: Specimen 1a: Depression
100: mold body
110: cavity
111: depression line 112: non-depression line
120: channel groove 121:
130: Curved line
200: Curved flow path plate
300: filler
400: Body cover
500: first straight line
600: second straight line

Claims (4)

1. An injection mold having a rapid heating and cooling flow path for injection molding a finished product having a depression formed therein,
A cavity defined by a depressed line formed along the depressed portion and a non-depressed line in a cross section is formed at a lower portion so as to form a molding space of the article of manufacture, and a plurality of A mold main body in which a flow groove is recessed at an upper portion,
A plurality of curved flow path plates inserted into the lower portion of each of the flow path grooves so as to form a curved flow path at the lower end of each of the flow path grooves of the mold body,
A plurality of filling materials filled in the respective flow path grooves of the mold body upwardly of the respective curved flow path plates;
And a main cover coupled to an upper portion of the mold body to cover and seal the upper portion of the filler,
The mold body includes:
A plurality of first rectilinear flow passages formed through the inside in a direction from the one side to the other side along the periphery of the non-recessed line of the cavity,
Further comprising a plurality of second linear flow passages each formed in one side direction and the other side direction so as to communicate with both ends of a curved flow path formed at a lower end of each of the flow path grooves, mold.
The method according to claim 1,
The mold body includes:
Each of the flow grooves being wider than the respective ones of the flow grooves so that a stepped surface is formed at a lower portion of each of the flow grooves,
The curved flow-
And fastened to the stepped surface and fixedly coupled to the stepped surface.
3. The method according to claim 1 or 2,
The curved flow-
Wherein the molten metal is a copper alloy.
3. The method according to claim 1 or 2,
The filler material,
Wherein the mold is an epoxy resin.

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