KR102428638B1 - Apparatus of protecting surface of hopper using separating part of residue - Google Patents

Abstract

A mold apparatus including a hopper using a residue separator to easily remove residues, improve working conditions, and reduce environmental problems is provided. The device includes a hopper into which the liquid resin is put, a separating part that is closely attached to the inner surface of the hopper to separate the liquid resin from the hopper, and a connection part that is attached and inserted into the outlet of the hopper, and the liquid resin is injected into the mold at the connection part and at least one injection hole into which the injection tube is inserted.

Description

Apparatus of protecting surface of hopper using separating part of residue

The present invention relates to a device for protecting the surface of a hopper, and more particularly, a device for easily removing residues from a hopper that supplies liquid resin using a residue separator, improving workability, economic feasibility, etc., and protecting the surface of the hopper is about

A mold (eg, vacuum mold) refers to a method of manufacturing a silicone mold using a pre-fabricated master, then injecting a liquid resin in a vacuum state and curing it in a drying furnace to mold it. Specifically, first, a mock-up, which is a master, is manufactured, and then a silicone resin is processed according to a three-dimensional shape to make a silicone mold. Thereafter, the liquid resin is injected into the cavity between the silicone molds in a vacuum state and cured in a drying furnace to obtain a desired product. Vacuum molds are suitable for small-volume production of various types and are widely used in the manufacture of automobile parts, medical devices, and cases of electronic products. Such vacuum molds are being developed in various ways so that products can be molded more precisely and easily. A wide variety of vacuum casting methods have been proposed, for example, a method of removing air bubbles from the surface as in Korean Patent Registration No. 10-1139361.

On the other hand, in order to supply the liquid resin to the cavity between the molds, a funnel-shaped hopper is usually used. When liquid resin is put into the hopper, the liquid resin is injected into the cavity through the supply pipe. When the supply of the liquid resin is completed, the liquid resin is cured and remains in the hopper. Residues of the cured liquid resin are usually removed by an air gun, which takes a lot of time and generates serious noise. Residues removed with an air gun are disposed of. In addition, after removing the hardened residue, it is washed with a chemical solvent such as ethyl alcohol, which deteriorates the working environment due to odor and causes environmental problems.

An object of the present invention is to provide a hopper surface protection device using a residue separator that easily removes residues, improves the working environment, and reduces environmental problems.

A hopper surface protection device using a residue separation unit for solving the problems of the present invention is attached to a hopper into which a liquid resin is put, and a separation unit and the separation unit which are in close contact with the inner surface of the hopper to separate the liquid resin from the hopper. and a connection part inserted into the outlet of the hopper. In this case, the connection part includes at least one injection hole into which an injection pipe for injecting the liquid resin into the mold is inserted.

In the apparatus of the present invention, the hopper may be installed on a partition wall separating the upper chamber and the lower chamber. The number of injection holes is the same as the number of injection tubes. The separator may have a funnel shape. The separation unit may include a substrate, and an inner surface coating may be provided on the inner surface of the substrate. The substrate may be made of a paper material. The inner surface coating may be made of a synthetic resin that imparts a lubricating function. The separation unit may include a substrate, and an outer surface coating for protecting the substrate may be included on the outer surface of the substrate.

According to the hopper surface protection device using the residue separation part of the present invention, by applying the separation part capable of separating the residues to the hopper, the residues are easily removed, the working environment is improved, and environmental problems are reduced.

1 is a cross-sectional view schematically showing a vacuum molding apparatus according to the present invention.
FIG. 2 is a perspective view showing the separation part of FIG. 1 .

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. The embodiments described below may be modified in various other forms, and the scope of the present invention is not limited to the embodiments described in detail below. The embodiments of the present invention are provided to more completely explain the present invention to those of ordinary skill in the art. In the drawings, exaggerated representations are made for convenience of explanation. On the other hand, terms indicating positions such as upper, lower, front, etc. are only related to those shown in the drawings. In practice, the protective device can be used in any optional orientation, and in practical use the spatial orientation changes with the orientation and rotation of the protective device.

An embodiment of the present invention proposes a molding apparatus that easily removes residues, improves a working environment, and reduces environmental problems by applying a separator capable of separating residues in a hopper. To this end, the protection device for protecting the surface of the hopper on which the residue separation unit is mounted will be described in detail, and the process of removing the residue by the residue separation unit will be described in detail. In the embodiment of the present invention, as a molding apparatus, a vacuum molding apparatus is taken as an example. In other words, the molding apparatus can be applied to an atmospheric molding apparatus in addition to a vacuum molding apparatus. By the way, the vacuum mold is suitable for small quantity production of various kinds, and can be used to manufacture automobile parts, medical devices, exterior cases of electronic products, parts of home appliances, and the like. Therefore, as the molding apparatus, a vacuum molding apparatus is preferable.

1 is a cross-sectional view schematically showing a vacuum molding apparatus 100 according to an embodiment of the present invention. However, the drawings are not expressed in a strict sense, and there may be components not shown in the drawings for convenience of description.

Referring to FIG. 1 , a vacuum molding apparatus 100 includes an upper chamber 10 and a lower chamber 20 separated by a partition wall 15 . The mold 30 is accommodated in the lower chamber 20 , and the hopper 40 for injecting the liquid resin (a) is installed on the partition wall 15 so that a part thereof is exposed to the upper chamber 10 . The liquid resin (a) is introduced through the hopper 40 extending from the upper chamber (10). The inlet of the hopper 40 is located in the upper chamber 10 . In the process of injecting the liquid resin (a), the upper chamber 10 is in a de-vacuum state like atmospheric pressure, and the lower chamber 20 is in a vacuum state. The reason that the lower chamber 20 is in a vacuum state is that the molded article is molded by the mold 30 . The mold 30 includes an upper mold 31 and a lower mold 32 having a cavity 33 therein. The mold 30 may be made of various materials, but silicon is preferred.

The upper chamber 10 and the lower chamber 20 separated by the partition wall 15 are structures for vacuum casting by differential pressure. In some cases, instead of the upper chamber 10 and the lower chamber 20 separated by the partition wall 15, the injection pipe 34 may be fixed without the partition wall 15 by a clamp (not shown). . In this case, it is not divided into the upper chamber 10 and the lower chamber 20, and may be formed by gravity instead of differential pressure. Here, the upper chamber 10 and the lower chamber 20 are presented as examples.

When the liquid resin (a) is filled in the cavity (33), a desired molded article is manufactured according to the shape of the cavity (33). The cavity 33 applied to the vacuum molding apparatus 100 has many bending parts, inflection points, and the like, and may have a relatively complicated shape. A reinforcing sheet 36 may be attached to the side of the mold 30 for structural stability. The reinforcing sheet 36 is preferably an adhesive sheet coated with an adhesive, and other sheets may be used within the scope of the present invention. By the reinforcing sheet 36 , the mold 30 can prevent minute displacement that may occur in the process of vacuum molding. The reinforcing sheet 36 may cover the entire side of the mold 30 , and may cover a portion in which the upper mold 31 and the lower mold 32 contact each other.

The upper mold 31 is provided with an injection pipe 34 and a discharge port 35 communicating with the cavity 33, respectively. The inlet 34 and the outlet 35 are spatially spaced apart, and at least two outlets 35 are disposed. In the drawing, one outlet 35 is shown. The discharge port 35, in the process of manufacturing a molded product with the vacuum molding apparatus 100, can determine the location of the cavity 33 at which the discharge of the liquid resin (a) is required, and appropriately determine the mounting position. Preferably, the discharge port 35 is formed near the bending point of the cavity 33 . Although the discharge port 35 is not necessarily formed near the bending part or the inflection point, it may be formed at a point other than the bending part and the inflection point in consideration of the flow of the liquid resin (a). Of course, the discharge port 35 may not be provided depending on the shape of the cavity 33 . The liquid resin (a) is a polymer resin, and its type is determined according to the type and shape of the molded article of the present invention.

The liquid resin (a) is injected by applying a pressure equal to atmospheric pressure to the upper chamber 10 . The reason for applying pressure to the liquid resin (a) is to make it easily discharged through the discharge port (35). If no pressure is applied to the liquid resin (a), the liquid resin (a) is not easily discharged. Specifically, if no pressure is applied, the liquid resin (a) boils by vacuum and bubbles are generated. The bubble prevents the liquid resin (a) from being evenly spread in the cavity (33), and prevents the liquid resin (a) from being properly discharged through the discharge port (35). However, when pressure is applied as in the embodiment of the present invention, the air bubbles are forcibly pushed in the direction of the outlet 35 . The amount of the injected liquid resin (a) can be adjusted by the valve (37).

The hopper 40 is for injecting the liquid resin (a) into the cavity 33 , and is connected to at least one injection pipe 34 through the connection part 42 . The connection part 42 is built into the hopper outlet 41 extending from the hopper 40 . The hopper 40 is preferably in the form of a funnel in order to smoothly inject the liquid resin (a). The injection pipe 34 is coupled to the injection hole 43 formed inside the connection part 42 . The method of coupling the injection tube 34 and the injection hole 43 is not necessarily limited thereto, but the injection tube 34 may be inserted into the injection hole 43 and coupled thereto. The number of injection holes 43 varies according to the number of molds 30 . For example, when the three molds 30 are mounted in the lower chamber 32 , there are three injection tubes 34 , and there are three injection holes 43 corresponding thereto. In the drawing, one injection tube 34 and one injection hole 43 corresponding thereto are expressed.

The separation unit 50 is in close contact with the inner surface of the hopper 40 to separate the liquid resin (a) from the hopper (40). In order to bring the separation unit 50 into close contact with the inner surface of the hopper 40 , the shape of the separation unit 50 matches the shape of the hopper 40 . If the hopper 40 is a funnel shape, the separator 50 is also a funnel shape. The end of the separating portion 50 is attached to the connecting portion 42 . In the method in which the separation part 50 is attached to the connection part 42, the separation part 50 is attached to the connection part, or the separation part 50 is inserted between the hopper outlet 41 and the connection part 42 to be coupled. have. A method in which the separation unit 50 is attached to the connection unit 42 may be variously modified within the scope of the present invention in addition to the method presented above.

When the separation unit 50 is present, the liquid resin (a) is accommodated in the space provided to the separation unit 50 . In this case, the liquid resin (a) does not contact the hopper (40), and the liquid resin (a) is separated from the hopper (40). If the separation part 50 does not exist, a part of the liquid resin (a) is cured and remains on the inner surface of the hopper 40 and the part where the hopper 40 and the connection part 42 meet after the vacuum molding is completed. . In order to use the hopper 40 again, it is necessary to remove the cured and remaining liquid resin (a). Residues of the cured liquid resin are usually removed by an air gun, which takes a lot of time and generates serious noise. Residues removed with an air gun are disposed of. In addition, after removing the hardened residue, it is washed with a chemical solvent such as ethyl alcohol, which aggravates the working environment due to odor and causes environmental problems.

Since the separation unit 50 does not bring the liquid resin (a) into contact with the hopper 40 , the residue does not remain in the hopper 40 and remains on the inner surface of the separation unit 50 . After the vacuum molding is completed, when the separation unit 50 is removed, the residue is removed together with the separation unit 50 . That is, it is better to use the separation unit 50 according to the embodiment of the present invention for one time use rather than repeatedly using it. In addition, when a lubricating coating is applied to the separation unit 50 , it is possible to reduce the residue remaining on the inner surface of the separation unit 50 . Reducing the amount of the residue is environmentally beneficial because less residue is disposed of. This will be described in detail with reference to FIG. 2 .

FIG. 2 is a perspective view illustrating the separation unit 50 of FIG. 1 . At this time, the vacuum molding apparatus 100 will be referred to FIG.

According to FIG. 2 , the separation part 50 is preferably in a funnel shape, and the inner surface coating 52 is preferably present on the inner surface of the substrate 51 . If necessary, an outer surface coating 53 may be present on the outer surface of the substrate 51 . The inner coating 52 prevents the liquid resin (a) from penetrating into the substrate 51, and a function of making the surface slippery so that the liquid resin (a) is smoothly injected into the cavity 33 may be added. The inner surface coating 52 may be provided according to the material of the substrate 51 . Specifically, if the liquid resin (a) is not penetrated the substrate 51, for example, a plastic film, the inner surface coating 52 may not be necessary. In addition, if the substrate 51 is a paper material, since the liquid resin (a) penetrates, the inner surface coating 52 is required.

The substrate 51 of the embodiment of the present invention is preferably made of paper in consideration of low cost, ease of manufacture, and the like. The paper material is a thin sheet-like material made from wood pulp or fibrous material, and there are long-fiber and short-fiber papers. The long-fiber paper is mostly made of pure wood, and since the length of the fibers extracted from plants is maintained and has rigidity against external deformation, tearing or tearing is prevented or reduced, so the substrate 51 is preferred do. The substrate 51 of paper material is not limited thereto, but may be kraft paper using unbleached kraft pulp, which is a kind of chemical pulp, as a main raw material. When the kraft paper is applied, the substrate 51 is not easily damaged due to excellent tensile strength, tear strength, elongation, and the like.

The separation part 50 does not cause deformation due to temperature change, does not permeate the liquid resin (a), and is preferably made of a material that adheres well to the hopper 40 and the connection part 42 . In this way, the separator 50 has no effect on the surface of the hopper 40 for residue. In order to satisfy the characteristics of the separation unit 50 presented above, a paper material is preferable.

The inner coating 52 may be made of any one layer of synthetic resin, metal, and ceramic. The metal may be, for example, aluminum, and the ceramic may be silica. By the way, although the metal and ceramic prevent the liquid resin (a) from penetrating into the substrate 51, the lubrication function is insufficient. Accordingly, the inner surface coating 52 is preferably coated with a synthetic resin that imparts a lubricating function, such as wax such as paraffin. The synthetic resin such as paraffin wax imparts a lubricating function to the inner coating 52 . If the lubricating function exists, the liquid resin (a) is easily injected in the direction of the cavity (33). The outer coating 53 is selectively applied, and serves to protect the substrate 51 from being damaged. The outer coating 53 is preferable even if the lubricating function is not provided.

As mentioned above, the present invention has been described in detail with reference to preferred embodiments, but the present invention is not limited to the above embodiments, and various modifications may be made by those skilled in the art within the scope of the technical spirit of the present invention. It is possible.

10; upper chamber 20; lower chamber
30; mold 31; upper mold
32; lower mold 33; cavity
34; infusion tube 35; discharge part
36; reinforcing sheet 37; valve
40; Hopper 41; hopper exit
42; connection 43; injection hole
50; Separator 51; write
52, 53; inner coating and outer coating

Claims (8)

a hopper into which liquid resin is put;
a separation unit in close contact with the inner surface of the hopper to separate the liquid resin from the hopper; and
An end of the separation part is attached, and it includes a connection part inserted into the outlet of the hopper,
The hopper surface protection device using the residue separation part, characterized in that the inside of the connection part includes at least one injection hole formed by inserting an injection pipe for injecting the liquid resin into the cavity of a mold for manufacturing a molded article. According to claim 1, wherein the hopper is a hopper surface protection device using a residue separation part, characterized in that installed on the partition wall separating the upper chamber and the lower chamber. According to claim 1, wherein the number of the injection hole is the hopper surface protection device using a residue separation part, characterized in that the same as the number of the injection tube. [Claim 2] The device for protecting the surface of a hopper using a residue separating part according to claim 1, wherein the separating part has a funnel shape. [Claim 3] The hopper surface protection device using a residue separation unit according to claim 1, wherein the separation unit includes a substrate, and an inner surface coating is provided on the inner surface of the substrate. [Claim 6] The device for protecting the surface of a hopper using a residue separation part according to claim 5, wherein the base material is made of a paper material. [Claim 6] The device for protecting the surface of a hopper using a residue separating part according to claim 5, wherein the inner coating is made of a synthetic resin that provides a lubricating function. [Claim 2] The hopper surface protection device using the residue separation unit according to claim 1, wherein the separation unit includes a substrate, and an outer surface of the substrate includes an outer coating for protecting the substrate.

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