KR20120016409A - Double type mold apparatus for expanded molding and manufacturing method thereof - Google Patents

Abstract

PURPOSE: A dual mold device for foaming and a manufacturing method thereof are provided to easily obtain a surface glazing effect and reduce mold manufacturing costs since even if a complicated shape of a lightweight material is used, surface glazing is practiced. CONSTITUTION: A dual mold device for foaming comprises an outer mold(300), an inner mold(400), a core(500), at least one supply hole(620), and at least one discharge hole(630). The inner surface of the outer mold is processed according to the outer shape of a lightweight material. The inner mold is assembled to the outer mold to form a steam path(600) in a state of maintaining a gap from the inner surface of the outer mold with a support pin(610). Since the core is assembled in a state of maintaining a gap from the inner surface of the inner mold, the core forms a cavity(200) to form an article.

Description

Double mold apparatus for foam molding and its manufacturing method {DOUBLE TYPE MOLD APPARATUS FOR EXPANDED MOLDING AND MANUFACTURING METHOD THEREOF}

The present invention relates to a double mold apparatus for foam molding and a method for manufacturing the same, and more particularly, it can be smoothly processed to the surface in one molding, so that it is possible to secure the price competitiveness through cost reduction as well as the design side. The present invention relates to a double mold apparatus for foam molding and a method of manufacturing the same.

In general, the lightweight material is a material widely used as a packaging material such as automobile parts, electronic parts, heat insulating material and the like.

Such materials are commonly used expanded polypropylene (EPP), expanded polystyrene (EPS), etc., because they meet the required characteristics such as weight reduction, shock absorption, heat insulation, and thermal insulation.

In particular, EPP is an environmentally friendly plastic foam that is flexible, breakable, repeatable and chemically resistant, and is mainly used in various forms such as energy absorbers, cushions, and packings in the automotive industry. It is also used as a packaging material for electronic products in the electronics industry.

The EPP is usually manufactured by foam molding. Recently, a cap for injecting steam and cooling water into a mold made of aluminum casting and a core and cavity side is assembled, followed by foaming the raw materials and using steam and cooling water. By fusion and cooling the surface has been disclosed a method and a mold that can be made of a lightweight material such as the example of Figure 1, the outer surface is glazed (Glazing).

Therefore, such a lightweight material is advantageous in terms of cost because it does not require post-processing, and has the advantage of improving appearance quality.

However, since the mold structure capable of glazing the surface must have a steam supply for surface heating and fusion and a cooling water supply structure to obtain a surface glazing effect through short time cooling, molding of a product having curved parts, rib forming parts, and recesses, etc. It was extremely difficult to apply.

In other words, it is easy to make a steam supply and a coolant supply structure in the straight section, but it is very difficult to implement it in curved stones, protruding ribs, and recesses, and thus it is impossible to heat and cool it to a desired condition. It is extremely difficult to mold the disclosed homogeneous mold structure.

In order to improve this, there is an example in which the cooling means is provided in the form of an oil pipe, but in this case, the desired heat transfer is difficult, and thus the moldability is extremely low and the surface glazing is poor, but the quality is not effective.

As another example, there may be a form in which a hole is drilled in a mold by a gun drill. In this case, too much machining is difficult and practically impossible.

As another example, the mold can be divided into a plurality of pieces and assembled as much as possible in the state of being as straight as possible, which is possible, but it is difficult to practically use because it has very disadvantageous conditions in terms of efficiency, durability, cost, and quality.

In addition, in the case of mold manufacturing, the mold size is large and thin due to the characteristics of the target product, which is a lightweight material. Therefore, the thickness of the inner mold, which must maintain thermal conductivity appropriately, should be maintained at about 10-12 mm. As this occurs, there were many difficulties in manufacturing as well as the cost increase.

The present invention has been made in view of the above-mentioned problems in the prior art, and has been created to solve this problem, and improves the mold structure for foam molding which is conventionally used in automobile parts, electronic parts, heat insulating materials, packaging materials, and the like. It is possible to mold up to one time, easy, easy to manufacture, low cost and contribute to productivity improvement while providing a double mold apparatus for foam molding and a method of manufacturing the same to secure a price competitiveness through cost reduction There is a major problem.

The present invention is a means for achieving the above object, the outer mold and the inner surface of the mold while the outer surface is processed to fit the outer shape of the lightweight material is a product; An inner mold which is assembled while maintaining a predetermined interval by the inner surface of the outer mold and the support pin to form a steam flow path formed of a completely empty space; A core assembled at a distance from an inner surface of the inner mold to form a cavity for forming a product; At least one supply port penetrating a part of the outer mold to supply steam or cooling water formed in communication with the steam flow path; A portion of the outer mold provides a double mold apparatus for foam molding, characterized in that it comprises a plurality of outlets formed in communication with the steam flow path through the outer mold at a distance from the supply port.

At this time, the steam or cooling water supplied through the supply port is rotatably supplied to form a vortex, the outer mold is characterized in that the condensate drain hole is further formed to discharge the condensate.

In addition, the present invention comprises the steps of forming an outer mold to form the appearance of the mold and the inner surface is processed in accordance with the outer shape of the lightweight material is a product, a plurality of supply ports and outlets for supplying and discharging steam or cooling water; Forming a steam flow path by assembling an aluminum block having an outer surface processed into a shape corresponding to the inner surface of the outer mold with the support pins at equal intervals with the inner surface of the outer mold; An inner mold forming step of cutting the inner surface of the assembled aluminum block with a tool and processing the same as an outer shape of a lightweight material as a product; It provides a method of manufacturing a double mold apparatus for foam molding comprising the step of forming a cavity by assembling the core on the inner surface of the processed inner mold.

According to the present invention, even in the case of a lightweight material having a complicated shape, it is easy and easy to manufacture a mold capable of securing a visual and tactilely beautiful appearance through surface glazing, and the lightweight material thus manufactured is very advantageous in terms of price. In terms of processing, it is easy to achieve the effect of lowering the labor and time.

1 is an exemplary sample photograph showing a lightweight material having a simple structure in which the surface is glazed according to the prior art.
2 is an exemplary schematic view of a double mold apparatus for foam molding according to the present invention.
Figure 3 is an exploded perspective view showing an example of product molding through the double mold apparatus for foam molding according to the present invention.
Figure 4 is an exemplary view showing a method of manufacturing a double mold apparatus for foam molding according to the present invention.

Hereinafter, with reference to the accompanying drawings will be described in detail a preferred embodiment according to the present invention.

First, the lightweight material according to the present invention is manufactured and finished by the surface glazing molding method.

The surface glazing method according to the present invention is a mold having a structure capable of switching heating and cooling in a short time so that the EPP can be cooled in a short time in a state in which the EPP is melt-fused by a high temperature heated unlike the conventional water-cooling and direct cooling method. Is done using

At this time, the steam used in the present invention is heated by using a high temperature steam of 200 ~ 220 ℃ generated by the steam generator and then quenched in a short time through the cooling water circulating the mold at the time of the surface glazing separate post-processing It is to make a lightweight product of excellent appearance quality having a smooth surface with the surface glazed with a single material without attaching other materials that can enhance the appearance quality.

To this end, the present invention uses a mold for foam molding having the same structure as the example shown in Figs.

As shown, the mold apparatus according to the present invention is for molding the lightweight material 100, which is a product by heat-sealing the raw material, the outer mold 300 to form a cavity 200 is supplied raw material is heat-sealed It consists of an internal mold 400 and the core 500.

In addition, these outer mold 300, the inner mold 400 and the core 500 is in the form of a double mold detachably assembled to each other by a known fastening means.

That is, the steam flow path 600 is formed between the outer mold 300 and the inner mold 400, and processed between the inner mold 400 and the core 500 to fit the shape of the lightweight material 100 that is a product. Cavity 200 is formed.

In addition, the example of the mold shown in Figures 2 and 3 is a model for convenience of description, of course, may be modified in various forms in the field of the present invention.

In addition, the outer mold 300 and the inner mold 400 is supported by each other by the support pins 610 to maintain the exact distance, in this case the inner mold 400 is deformed because it is usually made in the range of 10 ~ 12mm Be careful because this is easy.

In addition, in the present invention, the steam flow path 600 is maintained in a completely empty state, the steam is configured to pass directly through the inside, and also configured to allow the cooling water to flow during cooling.

In addition, at least one supply port 620 is formed in the outer mold 300 and communicates with the steam flow path 600, and at least one outlet 630 is formed.

In this case, steam or cooling water may be supplied to the supply port 620, and a plurality of discharge ports 630 may be formed at various locations as necessary. Particularly, the steam flow path 600 may be provided when steam or cooling water is supplied. It is better to maintain the rapidity of heating or cooling by having a structure capable of forming a vortex inside.

To this end, it is more preferable that the plurality of supply ports 620 are rotatably arranged on the surface of the mold along the shape of the mold so that the steam or cooling water supplied through the supply port 620 can be circulated in rotation.

In addition, the outer mold 300, the inner mold 400 and the core 500 are made of all aluminum material having excellent thermal conductivity in order to improve moldability, and also withstands high pressure of about 25 kg (25 kg / ㎠). It must be designed so that it can

In addition, the outer mold 300 may be further formed with a condensate drain hole 640 for discharging condensate in addition to the outlet 630.

According to the present invention, since the steam flow path 600 is maintained in a completely empty space, even if the mold shape has a curved portion, protrusions, ribs, concave portions, etc. so as not to be affected by heating and cooling the portion at all. do.

In particular, the high pressure steam of 25kg having a 150 ~ 300 ℃ supplied into the steam flow path 600 is instantaneously spreading while causing the vortex to maintain an even heating temperature over the entire space of the steam flow path 600 This results in a uniform melting of the surface.

In addition, since the coolant supplied quickly after the heating is also supplied in a short time over the entire space of the steam flow path 600 in the same manner, the internal temperature of the steam flow path 600 of 200 to 240 ° C. is approximately changed between 10 to 15 seconds. It can be quenched up to 40 ~ 60 ℃, so that the surface glazing can be maintained uniformly, which makes higher quality products.

In addition, this method can be implemented without regard to shape at all, so that it can be easily applied to a product having a very complicated shape, and a product having a uniform glazing surface can be produced.

The mold apparatus according to the present invention having such a structure can be manufactured in the following manner.

As shown in Figure 4, first, the outer mold 300 manufacturing step is performed.

The outer mold 300 is to form the appearance of the mold, only the inner surface is to be processed into a specific shape, the specific shape may be the appearance of the product.

At this time, the external mold 300, the supply port for steam or cooling water supply 620, the outlet 630 or the condensate drain hole 640, etc. of course have to be processed in advance.

Then, the internal mold 400 manufacturing step is performed.

The inner mold 400 is arranged to be spaced apart by the support pins 610 on the inner surface of the outer mold 300 to form a steam flow path 600 having a width of about 10mm, to which the present invention belongs. In the field it should have a thickness of approximately 10-12 mm.

Therefore, the inner mold 400 is very difficult to assemble. This is because the thickness is so thin that deformation is caused during assembly and the desired product shape cannot be obtained.

Accordingly, in the present invention, the aluminum block 410 is first assembled so that the outer surface thereof has a shape corresponding to the inner surface of the outer mold 300 so as to be easily assembled.

Then, since the aluminum block 410 is in the form of a block having a considerable thickness, no deformation occurs during assembly, and it is also easy to assemble.

In this state, the assembly is completed, and when the assembly is completed, the lower surface of the aluminum block 410, that is, the core 500 is assembled using a machine tool such as CNC or NC, or a known machining tool, thereby forming the cavity 200. The surface to be formed is cut to fit the shape of the product.

Then, assembling the core 500 it is possible to easily manufacture a mold apparatus according to the present invention.

As a result, the present invention can easily and smoothly achieve the surface glazing effect, which can not be achieved by the conventional mold structure due to the complexity of the product shape, can reduce the cost of manufacturing the mold, and also has the advantage of increasing productivity do.

As such, the molding method according to the present invention is capable of sufficiently surface glazing with only a single material, thereby making it possible to make various lightweight materials and products having a high-quality appearance at low cost.

100: light weight material 200: cavity
300: outer mold 400: inner mold
410: aluminum block 500: core
600: steam flow path 610: support pin
620: supply port 630: discharge port
640: condensate drain hole

Claims (3)

While forming the appearance of the mold and the inner surface and the outer mold 300 processed to fit the outer shape of the lightweight material 100 is a product;
An inner mold 400 which is assembled with the inner surface of the outer mold 300 and the support pins 610 at a predetermined interval to form a steam flow path 600 consisting of completely empty spaces;
A core 500 assembled at intervals from an inner surface of the inner mold 400 to form a cavity 200 in which a product is molded;
At least one supply port 620 for supplying steam or cooling water formed to communicate with the steam flow path 600 through a portion of the outer mold 300;
Part of the outer mold 300 is characterized in that it comprises a plurality of outlets 630 formed to communicate with the steam flow path 600 through the outer mold 300 at a distance from the supply port 620. Double mold apparatus for foam molding.
The method according to claim 1;
Steam or cooling water supplied through the supply port 620 is rotatably supplied to form a vortex, the outer mold 300 for the foam molding, characterized in that the condensate drain hole 640 is further formed to discharge the condensate Double mold device.
While forming the exterior of the mold, the inner surface is processed according to the external shape of the lightweight material 100, which is a product, and the external mold 300 is manufactured such that a plurality of supply holes 620 and outlets 630 for supplying and discharging steam or cooling water are formed. Making a step;
The aluminum block 410 having an outer surface processed in a shape corresponding to the inner surface of the outer mold 300 is assembled to the inner surface of the outer mold 300 while maintaining an equal interval with the support pins 610. Forming a steam flow path 600;
Forming an inner mold 400 by cutting the inner surface of the assembled aluminum block 410 with a tool and processing the same as an outer shape of the lightweight material 100 as a product;
Method of manufacturing a double mold apparatus for foam molding, characterized in that it comprises a step of forming a cavity (200) by assembling the core (500) on the inner surface of the processed inner mold (400).

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