KR101340683B1 - Manufacturing method of casting wooden pattern and the pattern obtaining the same method - Google Patents

Abstract

The present invention relates to a method of manufacturing casting wooden pattern for medium to large sized product casting and a wooden pattern obtained thereby comprising: a first step for molding a wooden pattern as a casting product by using a material in which a sand and a laminating material are mixed; and a second step for forming a coating layer with a polyurethane resin on a surface of the wooden pattern. According to the present invention, a wooden pattern for casting is provided not only to manufacture a large size wooden pattern but also to prevent a deformation of a formation even though being used repetitively for manufacturing a mold by using a molding sand since the wooden pattern is sturdy by being manufactured by forming a coating layer which consists of a polyurethane resin on a surface of the wooden pattern of a sturdy formation, which is manufactured by mixing sand with cement or a laminating. The present invention is capable of manufacturing a wood pattern not only with low costs but also in a short time in comparison with a wooden pattern of a timber because a material is sand, which is easy to purchase, with cement or a laminating material.

Description

Manufacturing method of casting mold for medium and large products, and wood obtained by the method {Manufacturing method of casting wooden pattern and the pattern obtaining the same method}

The present invention relates to a method for producing a mold for casting a medium-large product, and a die obtained through the method, and more specifically, it can be used for a long time by mixing the cement or laminating material in sand to produce a die and is not affected by moisture. Therefore, the present invention relates to a method for manufacturing a mold for casting a large and medium product and a die obtained through the method.

In general, casting is a metal processing technique in which molten metal is poured into a mold such as a sand mold or a mold and solidified to produce casting products of various forms.

At this time, the material used in the manufacture of the mold is called a casting sand, also known as casting or casting.

Such casting is widely used in the production of products today, and as a main sand casting, quartz, feldspar, mica, clay, etc. are used as main components, and iron oxide or calcite is included as a small amount as impurities.

In this case, when selecting sand casting sand as a factor that determines the quality of the casting, several conditions for installation should be considered. Therefore, it is easy to manufacture a mold, and it must be a mold without defect of hot molten metal. In order to satisfy these conditions, the strength, hardness, air permeability, caking force, thermal expansion and moldability, etc. should be adjusted.

On the other hand, casting (casting) can be mass-produced in a relatively simple equipment than forging, sheet metal, welding, and the like, and is easy to process.

In order to obtain such a cast product, first, a die having a shape of a cast product must be provided.

Such a wooden die is used as a semi-permanent wooden die (1) produced by processing in the form of cast products in the form of wood, such as wood, or the situation is used as a disposable die by processing styrofoam. .

At this time, when producing the wood mold (1) there is a problem that the dimensions are unstable in the production of the mold using the molding sand occurs when the wood is not used to dry enough that the cracking or distortion occurs due to moisture.

Accordingly, as a material of the wood mold (1), wood that has been dried for a long period of time must be used to prevent deformation after processing into a wood mold. Therefore, expensive wood is used as a material for fabricating the wood mold (1). In addition, the use of pillars and beams of wooden houses that have been naturally dried for a long time, but the provision of this is not easy, there is also a problem of increasing the production cost of the wooden die (1), as well as a long production period. In addition, since most of the casting products are made in large size, it is also difficult to obtain a large size wood for the production of large casting products.

On the other hand, in the case of a wooden mold manufactured by processing styrofoam, a molten metal is poured into a styrofoam portion of a foundry company to produce a casting product. However, in the case of a styrofoam material, the surface of the cast product is not smooth because the surface particles are rough.

Moreover, large sized wooden dies may cause sagging or breakage when produced with styrofoam, which is not suitable for large sized wooden dies.

Therefore, to solve the problems of the conventional wood or styrofoam material, such as the present invention is produced by mixing the cement or laminating material in the sand, so that the solid can be used for a long time, it is not affected by moisture It is an object of the present invention to provide a method for producing a mold for casting a large and medium product that can maintain a constant shape for a long time without deformation of the die, and a die obtained through the method.

According to an aspect of the present invention,

A first step of forming a temporary mold into a shape of a casting product using a material obtained by mixing cement or laminating material with sand; A second step of forming a coating layer with a polyurethane resin on the surface of the temporary shape; It provides a method for producing a large and medium product casting wooden die, characterized in that consisting of.

At this time, the skeleton frame is characterized in that the frame is inserted.

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In addition, after the first step before the second step, characterized in that it further comprises a third step of drying the temporary die.

In addition, the temporary material is characterized in that the sand and the laminating material is mixed 1: 1.

In addition, the laminating material is characterized in that any one of ethylene vinyl acetate (EVA), polyurethane (PU), polyester (PET).

In addition, the coating layer is characterized in that the polyurethane resin is applied to the surface of the temporary mold by spraying or spraying, etc., and formed to a thickness of 1 to 3 mm.

And after the second step, the fourth step of wrapping the surface of the coating layer with a mesh, and further applying a polyurethane resin to form a finish layer; And further comprising:

In addition, the present invention also provides a mold for casting a medium-large product manufactured by the above production method.

The mold for casting large and medium products according to the present invention is manufactured by forming a coating layer made of polyurethane resin on the surface of a solid type of wooden mold, which is made by mixing cement or laminating in sand, so that it is rigid and repeatedly used in the production of a mold using a molding sand. Even if used, the deformation of the shape is not only prevented, but also has an advantage in the production of large wooden dies.

In particular, since the present invention uses a mixture of cement or laminating in the sand easy to purchase, it is possible to produce a wooden die at a low cost as compared to a wooden die, as well as to produce a wooden die in a short time.

In addition, the mold for casting a medium-large product according to the present invention forms a coating layer by applying a polyurethane resin on the surface, so that the surface of the mold is smooth, so that the surface of the casting product can also be smoothly formed, and sand and cement or laminating with the material of the mold. As it uses ash, it is not influenced by moisture, so it can maintain a constant shape for a long time without deformation of the wooden mold, and it is possible to manufacture a solid mold and casting products for a long time.

1 is a view showing an example of a conventional general wooden die.
Figure 2 is a perspective view showing an example of a mold for casting large and medium products according to an embodiment of the present invention.
3 is a cross-sectional view illustrating an example of a mold for casting a medium-large product shown in FIG. 2.
FIG. 4 is a view illustrating another example of the mold for casting a medium-large product shown in FIG. 2.
FIG. 5 is a view illustrating an inner core used together in the manufacture of a cast product using a mold for casting a medium-large product shown in FIG. 2.
FIG. 6 is a view illustrating a manufacturing example of upper and lower molds using the casting die illustrated in FIG. 2.
FIG. 7 is a diagram for explaining an example of adhesion between the upper and lower molds shown in FIG. 6.
8 and 9 are views for explaining an example of casting of the cast product using the upper and lower molds shown in FIG.

Hereinafter will be understood by the embodiments described in detail with reference to the accompanying drawings, a method for producing a large and medium product casting die according to the present invention with reference to the accompanying drawings.

Since the present invention may be modified in various ways and have various forms, embodiments (or embodiments) will be described in detail in the text. It is to be understood, however, that the invention is not intended to be limited to the particular forms disclosed, but on the contrary, is intended to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.

In the drawings, the same reference numerals are used for the same reference numerals, and in particular, the numerals of the tens and the digits of the digits, the digits of the tens, the digits of the digits and the alphabets are the same, Members referred to by reference numerals can be identified as members corresponding to these standards.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. In the present application, the term " comprising " or " consisting of ", or the like, refers to the presence of a feature, a number, a step, an operation, an element, a component, But do not preclude the presence or addition of one or more other features, integers, steps, operations, components, parts, or combinations thereof.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Terms such as those defined in commonly used dictionaries are to be interpreted as having a meaning consistent with the contextual meaning of the related art and are to be interpreted as either ideal or overly formal in the sense of the present application Do not.

2 and 3, the cast die 100 according to the present invention is a cast die 100 that is molded into the shape of the casting product using a material mixed with cement or laminating material in the sand, and the die ( It consists of a coating layer 130 is coated with a polyurethane resin on the surface of 110.

In this case, the casting die 100 according to the present invention can be produced in a small unit, but can be prevented from sagging when produced in a large unit of die.

Hereinafter, the manufacturing process of the medium-large product casting wooden mold according to the present invention will be described in detail. At this time, the illustrated die for casting 100 is for producing a large water pipe as a cast product, in order to produce such a large water pipe uses an inner core 300 as necessary.

First, in manufacturing a casting product, the wooden mold 110 may be manufactured from a material in which cement or laminating material is mixed with sand. That is, the temporary mold 110 is made of the shape of the casting product to be manufactured by using a material in a state in which the laminating material mixed in a certain ratio of sand and cement or sand.

In this case, in the case of manufacturing the large wooden die 110, the frame frame 120 of various forms such as reinforcing bars or metal plates may be inserted into the wooden die 110 to reinforce the weak tensile force. .

In addition, the frame frame 120 may be manufactured in various forms according to the size of the wooden frame 110, to form a skeleton of the wooden frame 110 to be manufactured by fixing one or more frame frame 120 integrally do.

In this case, the frame frame 120 may be a material of various materials having rigidity, such as wood, steel, synthetic resin (plastic).

After the skeleton is formed using the frame frame 120 as described above, the shape of the casting product is integrally combined with a material in which a laminating material is mixed in a predetermined ratio with sand and cement or sand in the space between the frame frame 120. Molding

When the material of the wooden mold 110 is made of sand and cement, a mortar in which water is mixed by mixing sand with cement is used. In this case, for example, mortar mixed with sand and cement and water in a 1: 2: 1 ratio is used. Can be used. Of course, such a compounding rate can be adjusted in various ways depending on the grain size of the sand and the quality of the cement.

In this way, the sand is mixed with cement to be molded into the shape of the casting product to be mixed with water, and then dried to evaporate moisture to complete the production of the wooden mold 110. In this case, the molded wooden mold 110 is naturally dried at least 10 hours or more, preferably 10 to 12 hours, which may vary the drying time according to the size of the wooden mold 110.

On the other hand, when the material of the temporary mold 110 is made of sand and laminating material, for example, a mixture of sand and laminating material in a 1: 1 ratio can be used. Of course, such a compounding rate can be adjusted in various ways depending on the particle size of the sand and the characteristics of the selected laminating material.

In this case, the laminating material may be ethylene vinyl acetate (EVA), polyurethane (PU), polyester (PET) and the like.

As such, the material mixed with sand and the laminating material in a predetermined ratio is molded into a shape of a casting product to be cast and then dried to complete the production of the wooden mold 110. In this case, the molded wooden mold 110 is naturally dried at least 12 hours or more, preferably 12 to 24 hours, which may vary the drying time according to the size of the wooden mold 110.

Of course, the material of the wooden mold 110 is a mixture of laminating material in a certain ratio of sand and cement or sand, but when considering the weight, LDF, MDF, HDF, etc. by using the durability and robustness Will be able to secure.

On the other hand, when the temporary mold 110 is completed, the surface of the temporary mold 110 is rough surface by the sand particles. Therefore, by applying a polyurethane resin on the surface of the temporary die 110 to form a smooth coating layer 130, the production of the casting die 100 is completed.

In this case, the polyurethane resin is coated and coated on the surface of the temporary mold 110 by spraying or spraying, etc., the thickness of the coating layer 130 is preferably formed to a thickness of, for example, 1 to 3mm, It is then dried for at least 5 hours. Of course, the drying time can be shortened through hot air drying.

Subsequently, the coating layer 130 may be polished using sandpaper or the like as needed to further smoothly process the surface.

In addition, Figure 4 is a view showing for explaining another manufacturing process of the mold for casting large and medium products according to the present invention. According to this, after forming the coating layer 130 is wrapped with a mesh 140. After performing the impregnation process surrounding the mesh 140 and dried, to form a separate finishing layer 150 to complete the casting die 100. Of course, the finishing layer 150 is also made by applying a polyurethane resin like the coating layer 130 and the drying is the same as the natural drying at least 5 hours.

In this case, the mesh 140 may use a variety of materials, such as fabric, synthetic yarn, metal mesh.

The use of such a mesh 140 has the advantage that the bonding force of the coating layer 130 and the mesh 150 is increased, the strength and durability is increased, as well as deformation does not occur well.

Meanwhile, in the case of a casting product such as a large water pipe, a hollow is formed therein, and an inner core 300 as shown in FIG. 5 is used together to form such a hollow, wherein the inner core is a molding groove. (312, 322) using a constant core manufacturing frame (310, 320) can be molded or molded using the same sand and cement or sand mixed with a laminating material in a predetermined ratio in the state of the mold (110). have.

The production of a mold using the casting die 110 produced by the various methods described above and an example of casting of a casting product using the mold will be described.

As shown in FIG. 6, the upper mold 202 is filled with the molding sand 204 to prepare the upper mold 200, and the lower mold 212 is filled with the molding sand 214 to form the lower mold 210. ). At this time, the upper mold 200 and the lower mold 210 can be produced regardless of the order.

In this case, when the upper mold 200 and the lower mold 210 are in close contact, the position adjusting male and female cores 205, 206, 215, and 216 are used so that their close contact positions are exactly the same.

As described above, the upper mold 200 and the lower mold 210 are formed with spaces 209 and 219 into which molten metal is introduced. In this case, a molten metal 217 for injecting the molten metal is formed in the upper mold 200. Then, the casting die 100 used to form the spaces 209 and 219 is separated. As such, the casting mold 100 used to manufacture the upper mold 200 and the lower mold 210 may be repeatedly used to manufacture another upper mold 200 and the lower mold 210 after separation.

In particular, when the large-size wooden die 110 is manufactured, the size is large, so the weight is considerable and must be moved using a crane or the like. One or more. Accordingly, the hooks (not shown) of the crane can be hooked to the hooks 208 and 218 to easily move up and down and horizontally.

Meanwhile, as shown in FIG. 7, the inner core 300 is mounted on the spaces 209 and 219 of the upper mold 200 and the lower mold 210, and the upper mold 200 and the lower mold are manufactured as described above. In close contact with the 210, the molten metal 400 is injected through the spout 217 of the upper mold 200, as shown in FIG. 8, to form a space between the space parts 209 and 219 and the inner core 300. Filling, cooling, and solidifying, as shown in Figure 9 by separating the upper mold 220 and the lower mold 210 to obtain a finished casting product 410.

2 to 9 of the casting die and mold and medium and large casting products are shown to illustrate some examples, the casting die and mold and casting products having a variety of shapes or shapes manufactured according to the present invention It can be produced by a variety of methods, these are beyond the scope of the present invention regardless of the shape or shape.

100: casting die 110: furniture
120: frame frame 130: coating layer
200,202: Mold 201,203: Foundry sand
200: upper mold 210: lower mold
300: internal core 400: casting sand
401: casting products

Claims (9)

A first step of forming the temporary mold 110 into a shape of a cast product using a material obtained by mixing any one laminating material among ethylene vinyl acetate (EVA), polyurethane (PU), and polyester (PET) in sand;
A second step of forming a coating layer 130 on a surface of the temporary mold 110 with a polyurethane resin; Method for producing a large and medium product casting wooden mold, characterized in that consisting of.
The method of claim 1,
Method of manufacturing a large and medium product casting wooden mold, characterized in that the frame frame 120 is inserted in the interior of the wooden die (110).
The method of claim 1,
And a third step of drying the temporary die after the first stage, before the second stage.
The method of claim 1,
The material of the wooden die 110 is a method of manufacturing a wooden mold for casting large and medium products, characterized in that the mixture of sand and laminating material in a 1: 1.
The method of claim 1,
The coating layer 130 is a method for manufacturing a large or medium product casting wooden mold, characterized in that formed by a thickness of 1 ~ 3mm by applying a polyurethane resin on the surface of the wooden mold (110).
The method of claim 1,
After the second step, the fourth step of wrapping the surface of the coating layer 130 with a mesh 140, and further forming a finish layer 150 by applying a polyurethane resin; Method for producing a large and medium product casting wooden mold, characterized in that it further comprises a.
A die for casting a large and medium product obtained by the manufacturing method of any one of claims 1 to 6.
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