KR101245830B1 - Plane cooling type high speed cooling and heating mold device - Google Patents

Abstract

PURPOSE: A rapid heating/cooling mold apparatus using a surface cooling chamber is provided to reduce the temperature variations of a mold part and to shorten the process time. CONSTITUTION: A rapid heating/cooling mold apparatus includes a mold part, a heater part(200), and a cooling chamber(300). The mold part is formed to be divided into a molding mold(120a) having a molding surface, and a cooling mold(120b) attached to the opposite side of the molding surface of the molding mold. The heater part is installed on the molding mold. The cooling chamber is placed to cover the entire molding surface between the cooling mold and the molding mold, and cools the molding surface with a surface cooling method.

Description

Rapid heating cooling mold apparatus using cotton cooling chamber {PLANE COOLING TYPE HIGH SPEED COOLING AND HEATING MOLD DEVICE}

The present invention relates to a rapid heating cooling mold, and more particularly, by using a surface cooling method to increase the cooling rate and at the same time reduce the volume of the heated mold to reduce the heating time and energy consumed for heating, process time It is related with the rapid heating cooling mold which can shorten.

The polymer resin injection mold does not generate weld lines on the surface of the resin when the resin is injected at a high temperature, and after the resin is injected, the mold is cooled to cure the resin. Therefore, the time required for the process cycle is determined by how rapidly heating and cooling takes place.

The present invention aims to shorten the process cycle and improve productivity by increasing the cooling rate in a mold apparatus for injection molding a polymer resin into a predetermined form.

Related prior arts include Korean Patent Application Publication No. 10-2008-0104595 (published December 3, 2008) by the present applicant, 'Rapid heating and rapid cooling mold apparatus and its control method'.

SUMMARY OF THE INVENTION An object of the present invention is to provide a rapid heating cooling mold which rapidly heats the mold part, can be rapidly cooled by using a surface cooling method, and as a result, can reduce the temperature deviation of the mold part and shorten the process time.

Another object of the present invention is to provide a rapid heating cooling mold that can reduce the time and energy required for heating the mold by reducing the volume of the mold to be heated by dividing the mold portion.

In order to achieve the above object, the present invention provides a mold and a mold including a cavity mold having a cavity surface into which molten injection material is injected, and a core mold having a core surface to be joined to the cavity surface. In order to penetrate the mold unit comprises a heater unit, wherein the mold unit is divided into a molding mold with a molding surface and a cooling mold attached to the opposite side of the molding mold, the heater is installed in the molding mold And, between the cooling die or the molding die provides a rapid heating cooling die device characterized in that a single cooling chamber is provided to surround the entire molding surface.

It is preferable that an O-ring of an elastic material is provided along the outer circumferential surface of the cooling chamber. At this time, the molding mold and the cooling mold is more preferably combined to compress both sides of the O-ring, the molding mold and the cooling mold is not in direct contact.

In addition, a resin inlet may be provided through the cooling chamber. It is more preferable that the resin inlet is provided inside a protrusion formed to protrude from the molding die or the cooling mold, and an O-ring is provided at a portion where the protrusion and the other mold contact each other.

In addition, a pulling pin may be provided to penetrate through the cooling chamber, and the pulling pin may be provided inside the protrusion formed to protrude from the molding die or the cooling mold. And it is more preferable to provide an O-ring in the part which the said projection part and another metal mold contact.

In the rapid heating cooling die apparatus using the surface cooling method according to the present invention, the cooling is made by the surface cooling method by dividing the injection mold into a molding die and a cooling die, and forming a cooling chamber having a size covering the area of the molded article therebetween. It improves cooling efficiency, cooling speed and reduces temperature variation.

The present invention also reduces the size of the mold heated by the heater unit by dividing the mold and insulating the divided mold, thereby reducing the energy and time consumed for heating.

1 is a block diagram showing a rapid cooling heating mold according to an embodiment of the present invention,
Figure 2 is an exploded perspective view showing the structure of the rapid heating cooling mold according to an embodiment of the present invention,
3 is a cross-sectional view showing the structure of the rapid heating cooling die according to the embodiment of the present invention;
Figure 4 is an exploded perspective view showing the structure of a rapid heating cooling die according to another embodiment of the present invention,
5 is a cross-sectional view showing a structure of a rapid heating cooling die according to another embodiment of the present invention;
Figure 6 is a perspective view showing a cooling mold of the rapid heating cooling mold according to another embodiment of the present invention,
7 is a cross-sectional view showing a state in which the cooling mold of Figure 6 coupled.

Advantages and features of the present invention and methods for achieving them will be apparent with reference to the embodiments described below in detail with the accompanying drawings. It should be understood, however, that the invention is not limited to the disclosed embodiments, but is capable of many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, To fully disclose the scope of the invention to those skilled in the art, and the invention is only defined by the scope of the claims.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a block diagram showing a rapid cooling heating mold apparatus according to an embodiment of the present invention.

Referring to FIG. 1, the rapid heating cooling mold apparatus according to the present invention includes a cavity mold 120 having a cavity surface 122 into which molten injection material is injected, and a core surface that is joined to the cavity surface 122. A mold part 100 including a core mold 140 having a 142, a heater part 200 installed in the mold part 100 to heat the mold part 100, and the mold part ( Cooling fluid is filled at the time of cooling 100, and cooling chamber 300 serving as a heat insulating layer with the cooling fluid removed when the mold part 100 is heated, and a cooling fluid at the cooling chamber 300. It includes a cooling fluid supply unit 400 for supplying, and a compressor body supply unit 500 for blowing compressed air to remove the cooling fluid remaining in the fluid passage (300).

In the present invention, the cooling chamber 300 is formed as a single space, and has a form that covers the entire space where the injection material is injected (that is, the space for forming a molded article). The cooling chamber 300 maintains an empty state at the time of heating to serve as a heat insulating layer that insulates the mold and the cooling mold, so that the amount of heat consumed for heating is not transferred to the lower portion of the cooling chamber, thereby being substantially heated. It has the effect of reducing the size of the mold.

The present invention is characterized in that the mold is cooled by the surface cooling method by using the cooling chamber 300. In the conventional case, the cooling was performed by forming a plurality of tube-shaped cooling channels, but the surface cooling was not performed due to the arrangement intervals of the tubes, and thus there was a problem in that the temperature variation occurred a lot. On the other hand, cotton cooling can improve the cooling rate and reduce the temperature variation.

In general, a method of forming a cooling channel in a mold has been a method of shaping or drilling a bulk metal to realize a closed pipe shape. In this way, it is not possible to form a cooling chamber in the form of a plate, which is formed as a single space and has a whole or larger area.

The present invention can form a cooling chamber having a total area of the molded product or an area larger than that on the dividing line of the mold by splitting the mold and then assembling the mold.

Figure 2 is an exploded perspective view showing the structure of the rapid heating cooling die apparatus according to an embodiment of the present invention, Figure 3 is a combined cross-sectional view showing the structure of the rapid heating cooling die apparatus according to an embodiment of the present invention.

The rapid heating cooling mold according to the present invention includes a mold part including a cavity mold 120 having a cavity face 122 into which molten injection material is injected, and a core mold having a core face to be joined with the cavity face. And a heater unit installed to penetrate the mold unit in order to heat the mold unit.

The illustrated mold corresponds to a cavity mold, but the core mold can be configured in the same manner.

First, referring to FIG. 2, the mold part is provided with a molding mold 120a provided with a cavity surface 122 or a core surface (hereinafter, referred to as a molding surface), and cooling attached to an opposite side of the molding surface 122 of the molding mold 120a. It is divided into a mold 120b.

The heater unit 220 is disposed in the molding die 120a to be close to the molding surface, and a cooling chamber 300 is formed between the molding mold 122a and the cooling mold 122b. The cooling chamber 300 is divided into a molding mold 120a and a cooling mold 120b, and is formed to have an area covering the entire molding surface 122 directly under the molding surface 122 of the molding mold 120a. do.

Since the cooling chamber 300 is maintained empty when the heater unit 220 is operated, most of the heat generated from the heater unit 220 is transferred to the molding mold 120a, and almost as the cooling mold 120b. Not delivered. This is because the cooling chamber 300 performs a function as a heat insulating layer, and the molding mold 120a and the cooling mold 120b do not directly contact each other.

Conventionally, since both the cooling channel and the heater part are installed in a single mold, the thickness of the entire mold has a thickness to accommodate the heater part and the cooling channel, so that the heat supplied from the heater part is transferred to the mold around the cooling channel. Had the structure delivered. Compared with the conventional structure, the present invention heats only the molding die 120a, which is a part of the mold, with heat generated from the heater, thereby reducing energy and time consumed by heating.

On the other hand, when the refrigerant is filled in the cooling chamber 300 for cooling the mold, the molding die (120a) is cooled by the surface cooling method by the filled refrigerant. Since the cooling mold 120b is not substantially heated by the heater part, the object to be cooled by the refrigerant is limited to the molding mold 120a. Therefore, the cooling time is shortened.

In addition, such a structure is to increase the thickness and size of the cooling chamber without increasing the volume of the molding die 120a, which is the object to be heated by the heater unit, and the amount of the refrigerant can be increased, resulting in an improvement in the cooling rate. Bring it.

In the case of the conventional mold, when the diameter of the cooling chamber is increased, the thickness of the entire mold becomes thick, and thus the adverse effect of increasing the volume of the entire mold heated by the heater unit, but in the present invention, does not affect the heating time. Only the cooling rate can be increased. In addition, the cooling chamber 300 is connected to the refrigerant inlet 310 and the refrigerant outlet 320.

The molding mold 120a and the cooling mold 120b are connected with the O-ring 125 therebetween so as not to directly contact each other. This is to prevent the heat of the molding die 120a from being transferred to the cooling mold 120b at the time of heating and to prevent the leakage of the refrigerant.

In the drawing, the O-ring 125 is shown as having a circular cross section, but the cross-sectional shape of the O-ring 125 may be formed in a shape in which the cross-sectional area becomes narrower toward the molding mold 120a from the surface in contact with the cooling mold 120b. have. That is, it is preferable that the area where the O-ring 125 contacts the cooling mold 120b is larger than the area that contacts the molding mold 120a.

This is because the cooling mold (120b) has a small temperature change, but in the case of the molding mold (120a) is a wide range of temperature change, so that the O-ring 125 can exhibit a stable sealing force at this temperature change.

In the illustrated embodiment, although one cooling chamber is illustrated, a large area molded article may include a plurality of cooling chambers. In addition, a plurality of refrigerant inlets 310 and refrigerant outlets 320 may be connected to one cooling chamber.

Referring to FIG. 3, the molding mold 120a and the cooling mold 120b are connected with the O-ring 125 therebetween, so that the molding mold 120a and the cooling mold 120b do not directly contact each other. The O-ring 125 prevents the refrigerant inside the cooling chamber 300 from flowing out. O-ring 125 is made of an elastic material for this purpose. In addition, the O-ring 125 is preferably made of a material excellent in thermal insulation.

Since the molding mold 120a and the cooling mold 120b both contact only the O-ring 125 and do not directly contact each other, the heat exchange between the molding mold 120a and the cooling mold 120b is minimized when the heat conduction through the O-ring 125 is minimized. Can be minimized.

When the heat of the molding die (120a) is transferred to the cooling mold (120b) at the time of heating, since the heat flows out, more heat and time are consumed to heat the molding mold (120a). Therefore, reducing the amount of heat transferred from the molding die 120a to the cooling mold 120b enables efficient and rapid heating.

In addition, the divisional formation of the molding mold 120a and the cooling mold 120b may have an effect of reducing the volume of the mold heated by the heater unit 200. In other words, when the heater unit and the cooling channel are formed in a single mold as in the related art, the thickness of the mold is greater than the sum of the diameter of the heater unit 200 and the diameter of the cooling channel. Since the heater unit 200 may be disposed at 120a, the thickness of the mold may be determined by considering only the thickness of the heater unit 200, so that the volume of the mold heated by the heater unit 200 may be relatively reduced.

The cooling chamber 300 includes a coolant inlet 310 and a coolant outlet 320. The coolant is introduced through the coolant inlet 310, and the coolant is discharged through the coolant outlet 320.

When the heater unit 200 is operated, the cooling chamber 300 is in an empty state, and acts as an adiabatic space between the molding die 120a and the cooling mold 120b.

4 is a cross-sectional view showing a structure of a rapid heating cooling die according to an embodiment of the present invention, Figure 5 is an exploded perspective view showing the structure of a rapid heating cooling die according to another embodiment of the present invention.

In the illustrated embodiment, the resin inlet 352 is formed through the cooling chamber 300.

In the injection mold, a resin inlet is essential, but in the case of using a conventional tubular cooling channel, the tubular cooling channel is formed by avoiding the position where the resin inlet 352 is to be formed.

In the case of the present invention, since the cooling chamber 300 is formed to cover the typical shape of the molded article, the resin inlet 352 is formed through the cooling chamber 300.

To this end, the protrusion 350 is formed inside the cooling chamber 300. Protruding portion 350 is formed independently from the molding die (120a) or cooling mold (120b) in the form of an island, the O-ring 355 is inserted in the portion to be connected to prevent mixing of the refrigerant and the resin.

That is, the O-ring 355 is provided at the portion where the protrusion 350 and the other mold contact each other to thermally insulate and block the mixing of the resin and the refrigerant.

In addition to the resin injection hole, the injection mold may be provided with a pulling pin (not shown) for separating the molded injection product from the mold, and in the case of the pulling pin, the injection mold may be formed inside the protrusion.

6 is a perspective view showing a cooling mold of the rapid heating cooling mold according to another embodiment of the present invention, Figure 7 is a cross-sectional view showing a state in which the cooling mold of Figure 6 coupled.

As shown, the cooling mold 120b may be provided with a plurality of protrusions 350. The protrusion 350 is formed to penetrate the cooling chamber 300. In addition, the protrusion 350 may be formed in the form of an intermediate middle island of the cooling chamber 300.

In the illustrated embodiment, the protrusion 350 is formed in a circular shape, but may be formed in an elliptical shape, a rectangular shape, a polygonal shape, or the like.

As described above, the protrusion 350 may be provided with a resin injection hole 352 or a pulling pin 353, and a fastening means 354 may be provided inside the protrusion 350.

The cooling chamber 300 is formed in a flat plate shape, and when the size of the cooling chamber 300 is large, the protrusion 350 may be disposed to firmly fasten the cooling mold 120b and the upper mold 120a. The cooling chamber 300 is formed as an empty space. If the size is large, sagging of the upper mold 120a may occur. In this case, by arranging the protrusion part 350 in the middle, and fastening the part, the fastening of the cooling mold 120b and the upper mold 120a can be secured, and the deformation of the upper mold 120a can be prevented.

When using a 5mm diameter heater, when forming a tubular cooling channel (for example, 5mm) as in the prior art, the thickness of the mold was 30mm because the heater and the cooling channel must be embedded in the mold, but in the present invention Since the heater is built in the molding die, the thickness of the molding die can be reduced to about 15mm. Of course, in the present invention, although a cooling die is attached to the molding die, the heating mold is a molding die, and the part to be cooled by the refrigerant is also limited to the molding die, thereby reducing energy consumption for heating and cooling. In addition, the cooling rate and the heating rate can be improved to shorten the cycle time.

For example, when manufacturing a molded product of the size of 40mm * 200mm, the injection mold using the conventional tubular cooling channel took more than 100sec cooling time, but when using the surface cooling method of the present invention, the cooling time is reduced to 20 ~ 40sec You can.

Although the embodiments of the present invention have been described above with reference to the accompanying drawings, the present invention is not limited to the above embodiments but may be manufactured in various forms, and having ordinary skill in the art to which the present invention pertains. It will be understood by those skilled in the art that the present invention may be embodied in other specific forms without changing the technical spirit or essential features of the present invention. It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive.

120a: Mold
120b: cooling mold
125: O-ring
200: heater unit
300: cooling chamber
350: projection
352: resin inlet
353: pulling pin
354: fastening means
355 O-ring

Claims (10)

A mold part including a cavity mold having a cavity face into which molten injection material is injected, a core mold having a core face mating with the cavity face, and a heater installed to penetrate the mold part to heat the mold part. Includes wealth,
The mold part is divided into a molding mold having a molding surface and a cooling mold attached to an opposite side of the molding mold, and the heater part is installed in the molding mold, and is formed between the cooling mold or the molding mold. Is disposed to surround the entire surface is provided with a cooling chamber for cooling the molding surface by the surface cooling method,
An o-ring having an insulating material and an insulating material is formed along the outer circumferential surface of the cooling chamber to which the molding mold and the cooling mold are in contact. ,
Since the molding mold and the cooling mold are connected with the O-ring inserted, the molding mold and the cooling mold do not directly contact each other, thereby reducing the transfer of heat of the molding mold to the cooling mold. Rapid heating cooling mold device.
delete delete The method of claim 1,
Rapid heating cooling die device characterized in that it comprises a projection formed in the form penetrating the cooling chamber.
The method of claim 4, wherein
The projection portion is a rapid heating cooling die device, characterized in that formed integrally extending to the molding die or the cooling mold.
The method of claim 5, wherein
An o-ring is provided at a portion where the protrusion and the other mold come into contact with each other.
The method of claim 4, wherein
Rapid heating cooling die device characterized in that the resin inlet is formed in the projection.
The method of claim 4, wherein
Rapid heating cooling die device, characterized in that the pulling pin is provided inside the projection.
The method of claim 4, wherein
Rapid heating cooling die device characterized in that the fastening bolt is provided inside the protrusion.
The method of claim 1,
Rapid heating cooling die device characterized in that a plurality of the cooling chamber is provided.

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