KR102542230B1 - Method of Casting using Molten Metal Pouring and Additive - Google Patents

Abstract

A casting method using lamination and injection of molten metal according to an embodiment of the present invention is a shell mold lamination step of a molten metal lamination method in which molten metal is laminated to form an outer layer forming the appearance of a molding object having a hollow filling space therein. and a shell mold casting step of a casting method of filling the filling space by injecting molten metal into the filling space in a casting method.

Description

Method of Casting using Molten Metal Pouring and Additive

The present invention relates to a casting method using lamination and injection of molten metal, which can manufacture an object to be formed without casting by using the molten metal lamination processing and molten metal casting technology of the present invention.

As a method of manufacturing a molding made of metal, there are methods of casting and metal additive.

Casting is a method of manufacturing by making a casting to make a shape of a molding object with sand metal, etc., and then injecting and solidifying molten metal into the casting.

Metal lamination is a manufacturing method in which metal powder is stacked and combined in several layers to make the shape of a molding object.

Comparison of the two manufacturing methods has the following characteristics.

In terms of the preparation period for manufacturing, in the case of casting, it takes time to manufacture a mold corresponding to the shape of the object to be molded, whereas in the case of metal lamination, a mold is not required, which is relatively advantageous.

However, from the viewpoint of the time required for manufacturing, there is a difference in that in the case of casting, liquid molten metal can be injected, but metal powder corresponding to the shape of the object to be formed must be laminated in multiple layers.

In terms of responding to the precision of the object to be molded, in the case of casting, the shape must be formed through casting and then post-processed to produce the final object to be molded, whereas in the case of metal lamination, post-processing is almost unnecessary. There is a difference.

Casting is advantageous in terms of increasing the size of an object to be molded, whereas metal lamination is disadvantageous in terms of manufacturing time in the case of a large object to be molded.

As described above, in the case of casting and metal lamination, there are advantages and disadvantages depending on the manufacturing process and the characteristics of the object to be molded. And, accordingly, in the case of casting, it is relatively advantageous compared to metal lamination in manufacturing a molding object for mass production of a small variety, and in the case of metal lamination, it is relatively advantageous compared to casting in manufacturing a molding object for small-scale production of various kinds.

However, in the case of a molding object that needs to be produced in small quantities of various kinds, when a casting method is used or a metal lamination method is used, there is a problem in that efficient manufacturing is impossible due to the characteristics of the process as described above.

Republic of Korea Patent Publication No. 10-2015-0080662

The present invention is to solve the above problems, and to provide a casting method using molten metal lamination and injection, which can form an object to be formed while maximally securing the advantages of casting and metal lamination using molten metal.

The problem to be solved by the present invention is not limited to the above-mentioned problems, and problems not mentioned will be clearly understood by those skilled in the art from this specification and the accompanying drawings. .

In order to solve the above problems, the casting method using the lamination and injection of molten metal of the present invention is a shell mold lamination method in which molten metal is laminated to form an outer layer forming the appearance of an object having a hollow filling space therein. and a shell mold casting step of a casting method of filling the filling space by injecting molten metal into the filling space in a casting method.

A final lamination step of forming an object to be formed by laminating molten metal on top of the object to be formed in the shell mold casting step may be further included.

A structure stacking step of stacking the shell molds in the shell mold stacking step and then stacking the protruding structure inside the shell mold may be further included.

A reinforcing part stacking step of stacking a reinforcing part for reinforcing the outer layer formed in the cell template stacking step may be further included.

The casting method using lamination and injection of molten metal according to an embodiment of the present invention has the following effects.

First, there is an advantage in that a separate mold corresponding to the shape of the object to be molded is not required, which is advantageous in terms of preparation time for manufacturing and that it is advantageous to produce products of various shapes.

Second, there is an advantage in that it is possible to manufacture a molding object having a complex shape by manufacturing the part forming the exterior of the molding object in a lamination method.

Third, the center portion of the total volume of the object to be molded is manufactured by the molten metal injection method of casting, which has the advantage of shortening the molding time and being advantageous for the production of the object.

Effects of the present invention are not limited to the above-mentioned effects, and effects not mentioned will be clearly understood by those skilled in the art from this specification and the accompanying drawings.

1 is a view showing the sequence of a casting method using lamination and injection of molten metal according to a first embodiment of the present invention;
Figure 2 is a drawing and a photograph explaining the shell mold lamination step of the casting method using the lamination and injection of molten metal according to the first embodiment of the present invention;
Figure 3 is a drawing and a photograph explaining the shell mold casting step of the casting method using the lamination and injection of molten metal in the first embodiment of the present invention;
4 is a view explaining the final lamination step of the casting method using lamination and injection of molten metal according to the first embodiment of the present invention;
5 is a photograph explaining an object to be molded after post-processing of a casting method using lamination and injection of molten metal according to an embodiment of the present invention;
6 is a view showing the sequence of a casting method using lamination and injection of molten metal according to a second embodiment of the present invention;
Fig. 7 is a view for explaining a structure lamination step of laminating a structure inside a shell mold in the second embodiment of the present invention;
8 is a view explaining the shell mold casting step of the casting method using the lamination and injection of molten metal in the second embodiment of the present invention;
9 is a view showing the sequence of a casting method using lamination and injection of molten metal according to a third embodiment of the present invention;
Fig. 10 is a diagram for explaining a reinforcing part laminating step of laminating a reinforcing part inside a shell mold according to a third embodiment of the present invention;
Fig. 11 is a view explaining the shell mold casting step of the casting method using the lamination and injection of molten metal according to the third embodiment of the present invention.

Hereinafter, specific embodiments of the present invention will be described in detail with reference to the drawings. However, the spirit of the present invention is not limited to the presented embodiments, and those skilled in the art who understand the spirit of the present invention may add, change, delete, etc. other elements within the scope of the same spirit, through other degenerative inventions or the present invention. Other embodiments included within the scope of the inventive idea can be easily proposed, but it will also be said to be included within the scope of the inventive concept.

Figure 1 is a view showing the sequence of the casting method using the molten metal of the first embodiment of the present invention, Figure 2 is a view and photos explaining the shell mold lamination step of the casting method using the molten metal of the first embodiment of the present invention, Figure 3 is a drawing and a photograph explaining the shell mold casting step of the casting method using the molten metal of the first embodiment of the present invention, Figure 4 is a view explaining the final lamination step of the casting method using the molten metal of the first embodiment of the present invention. 5 is a photograph to explain the object to be molded after post-processing of the casting method using the molten metal according to the embodiment of the present invention.

1 to 5, the casting method using the molten metal of the present invention reflects the above-described casting and metal additive processes and product merits in manufacturing using the above-described molten metal to produce a variety of products. mass production can be carried out effectively.

Specifically, the casting method using molten metal in this embodiment includes a shell mold lamination step (S10), a shell mold casting step (S40), and a finish lamination step (S50).

Referring to FIG. 2, in the shell mold stacking step (S10), molten metal is laminated to form an outer layer 10 forming the appearance of a molding object having a hollow filling space S therein.

Specifically, if the explanation is based on manufacturing the gear shape (A) as shown in FIG. 5, in the present invention, for the cylindrical shape, the cylindrical shape is manufactured using the laminating of molten metal and the casting method of molten metal, and then through post-processing. The gear shape (A) is completed.

That is, in the shell mold laminating step (S10), as can be seen in the photograph of FIG. 2, the appearance of the object to be molded, that is, the cylindrical shape (see FIG. 3) with an open upper surface corresponding to the external appearance of the cylindrical shape is layered with molten metal. to make it The outer layer 10 made through this process performs the same function as a mold in a general casting process, and in the present invention, it is made through the lamination process of the molten metal of the mold.

Therefore, there is an advantage in that a separate mold is not required to perform the shell mold casting step (S20) described later, and there is an advantage in that various types of outer layers can be made through a lamination method.

Meanwhile, regarding the type and characteristics of molten metal, it is preferable that the lamination process be performed in a state in which an external shape can be formed by lamination.

Referring to FIG. 3, in the shell mold casting step (S20), the filling space is filled by injecting molten metal 20 into the filling space (S) like a general casting method. Since the casting method is adopted, the time required for manufacturing can be reduced compared to the case where the molten metal lamination method is adopted for the space.

In other words, in the case of the appearance where the shape and size of the object to be molded are important, the lamination method, which takes time but can form a precise shape, is adopted. while reducing the time required for production.

Referring to FIG. 4 , in the final lamination step (S50), a final object to be formed is created by laminating molten metal on top of the object to be formed in the step of casting the shell mold (S40).

In the case of the shell mold casting step (S40), the molten metal is injected in a casting method, and accordingly, it is difficult to make the upper surface of the injected molten metal into a shape desired by the user.

Therefore, in the shell mold casting step (S40), the upper layer 30 is formed in a layered manner in the shape and size desired by the user by adopting the lamination method of molten metal again, and forming the upper part of the object to be molded in the shell mold casting step (S40).

That is, in the casting method using the molten metal of the present invention, in the case of the outer layer 10 and the upper layer 30 corresponding to the appearance of the object to be molded, a lamination method of molten metal that can be molded in a relatively precise form and a precise form of molding are required. In the case of an internal filling space (S) without a molten metal, it is molded by a casting method that injects molten metal, so that a mold corresponding to the shape of the object to be molded is not separately manufactured, so it can be adopted for the production of various types of product groups and the time required for production is reduced. It has the advantage of being significantly reduced compared to the case of adopting the overall stacking method.

On the other hand, after finishing the lamination process (S50), post-processing in various ways may be performed according to the shape of the final molding object (A).

Figure 6 is a view showing the sequence of the casting method using molten metal in the second embodiment of the present invention, Figure 7 is a view explaining the structure stacking step of laminating the structure inside the shell mold of the second embodiment of the present invention, Figure 8 is a diagram explaining the shell mold casting step of the casting method using the molten metal according to the second embodiment of the present invention.

6 to 8, the casting method using the molten metal of this embodiment includes a shell mold lamination step (S10), a structure lamination step (S20), a shell mold casting step (S40), and a finish lamination step (S50). .

The shell mold lamination step (S10), the shell mold casting step (S40), and the finish lamination step (S50) are the same as in the first embodiment described above, and thus descriptions thereof are omitted.

In this embodiment, a structure stacking step (S20) is further included. In the structure stacking step (S20), the structure 40 is stacked in the filling space S inside the outer layer 10 made through the shell mold stacking step (S10).

In the case of the outer layer 10 and the molten metal 20, since they are made according to different processes, even if they are made of the same material, a slight difference in physical properties may occur between them. And, in the case of the boundary formed between the outer layer 10 and the molten metal 20, there is a possibility that damage may occur during a later use process.

Therefore, in the present embodiment, by stacking the structure 40 serving as a skeleton in the filling space S inside the outer layer 10, there is an advantage in that rigidity against the external force applied to the final molding object can be secured. .

Meanwhile, the structure stacking step (S20) may be performed after the shell mold stacking step (S10) or may be performed simultaneously with the shell mold stacking step (S10).

9 is a view showing the sequence of a casting method using molten metal according to the third embodiment of the present invention, and FIG. 10 is a view explaining the reinforcement part lamination step of laminating the reinforcement part inside the shell mold according to the third embodiment of the present invention. 11 is a diagram explaining the shell mold casting step of the casting method using the molten metal according to the third embodiment of the present invention.

9 to 11, the casting method using the molten metal of the present embodiment includes a shell mold lamination step (S10), a reinforcement part lamination step (S30), a shell mold casting step (S40), and a finish lamination step (S50). do.

The shell mold lamination step (S10), the shell mold casting step (S40), and the finish lamination step (S50) are the same as in the first embodiment described above, and thus descriptions thereof are omitted.

In this embodiment, a reinforcing part stacking step (S30) is further included. In the reinforcing part laminating step (S30), the reinforcing part 50 is laminated to support the outer layer 10 made through the shell mold laminating step (S10).

As described above, in the case of the outer layer 10, the outer shape of the entire object is formed. And in the present invention, the outer layer 10 has the advantage that it can be rapidly manufactured for various shapes as the filling space (S) inside the outer layer 10 is manufactured in a casting method in a lamination method.

In order to maximize these advantages, it is advantageous to shorten the time required for lamination of the outer layer 10 . Therefore, in this embodiment, while making the outer layer 10 thin so that the time required to make the outer layer 10 can be shortened in the shell mold lamination step (S10), the outer layer 10 is formed inside the outer layer 10. To form a reinforcement part 50 for supporting.

Therefore, even if a large amount of molten metal 20 is injected in the process of pouring molten metal 20 in the shell mold casting step (S40) to be described later, it is possible to prevent the outer layer 10 from being damaged.

Meanwhile, the reinforcing part stacking step (S30) may be performed after the shell mold stacking step (S10) or may be performed simultaneously with the shell mold stacking step (S10).

Meanwhile, the structure stacking step (S20) of the second embodiment of the present invention and the reinforcing part stacking step (S30) of the third embodiment of the present invention may be performed simultaneously.

In the above, the configuration and characteristics of the present invention have been described based on the embodiments according to the present invention, but the present invention is not limited thereto, and various changes or modifications can be made within the spirit and scope of the present invention. It is apparent to those skilled in the art, and therefore such changes or modifications are intended to fall within the scope of the appended claims.

10: outer layer 20: molten metal
30: upper layer 40: structure
50: reinforcement part

Claims (4)

A shell mold laminating step of a molten metal laminating method in which molten metal is laminated to form an outer layer forming an exterior of a molding object having a hollow filling space therein; and
Including; a shell mold casting step of a casting method of filling the filling space by injecting molten metal into the filling space in a casting method;
A casting method using lamination and injection of molten metal, further comprising a finish lamination step of forming an object to be formed by laminating molten metal on top of the object to be formed in the step of casting the shell mold. delete According to claim 1,
The casting method using the lamination and injection of molten metal further comprising a structure laminating step of laminating the shell mold in the shell mold laminating step and then laminating a structure protruding inside the shell mold. According to claim 1,
The casting method using the lamination and injection of molten metal further comprising a reinforcing part stacking step of stacking a reinforcing part for reinforcing the outer layer formed in the cell mold stacking step.

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