KR101741109B1 - Manufacturing method of casting using mold - Google Patents

Abstract

The present invention relates to a manufacturing method of a casting using a mold and, more specifically, relates to a manufacturing method of a casting, which forms a casting by inserting rusty water into a mold, and comprises: a release agent applying step; a shell mold installation step; a molding space forming step; a closing step; a rusty water input step; a casting separation step; and a finishing step. Therefore, a crack can be prevented.

Description

Technical Field [0001] The present invention relates to a casting method,

More particularly, the present invention relates to a method of manufacturing a casting using a mold. More particularly, the present invention relates to a method of manufacturing a casting mold using a casting mold, The casting is separated from the casting, and the release agent applied to the ironing part facilitates separation from the ironing part. In the process of hardening the casting mold, the shell mold gradually breaks and is separated from the casting so that the temperature of the casting gradually decreases. The present invention relates to a casting method using a casting mold, which prevents cracks from being generated as the temperature is rapidly lowered.

In general, casting is classified into cast iron casting, aluminum alloy casting, copper alloy casting, etc. according to the metal used, or by the type of casting mold and the flow of molten metal. The material of the mold is a mold that is made by engraving metal such as sand mold or steel which is made by molding sand molding firmly and sand is mixed with particles of synthetic resin which becomes hard when heated, There are various kinds of molds such as cast mold, mold casting, shell mold, etc., which are formed on a heated metal mold and then solidified to form a thin shell mold. The molten metal can be introduced by gravity casting using gravity, die casting by pressing molten metal into a mold, centrifugal casting using a centrifugal force to send molten metal to every corner of the mold, , The mold is turned downward, a part of it is placed on the surface of the molten metal, and the surface of the molten metal is pressurized with gas to put the molten metal in the mold, while the molten metal is sucked up from the bottom of the mold Injection molding method (injection molding method), etc.

Such casting work is made by making a casting device or by making a mold as in Korean Patent Application No. 10-2010-0086166. In the case of metal molds, metal pellets are poured to form a concave portion, which does not interfere with the flow of metal and has heat resistance (heat resistance). Since the mold uses a single mold several hundred times, it is divided into several pieces so that the casting can be easily removed after solidification. In the death penalty, you have to break the mold every time and remove the casting, so you have to make the number of molds. Usually, molds made by dividing a model of wooden product into several molds (mother mold) are put into a mold, and the mold is made by sanding around and hardening the mold, and then pulling out the mold. However, a combination of a cylinder and a disk is called a sweeping mold, and a mold is formed by rotating the shape of the plate made of the sand while making a sand mold. Next, it dissolves metals in various types of melting furnaces. In the case of alloys, pre-formulated components are first placed in a ladle and injected into a mold. Wait for hardening and take out the object. If it is dead, remove the sand and finish it as it is or finish the casting surface with the product. The coal stove is an example of the casting surface as it is, and the cast iron pot is an example of finishing.

In recent years, in order to manufacture a manhole frame to be formed by casting, a manhole frame is formed by injecting a casting between a mold core and a steel pipe. However, there is a problem that steel pipes melt during the casting of the casting, There arises a problem that it is difficult to separate them from each other.

The above-mentioned invention means the background art of the technical field to which the present invention belongs, and does not mean the prior art.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems occurring in the prior art, and an object of the present invention is to provide a method of manufacturing a casting mold, The mold is easily separated from the casting, and the mold release agent applied to the iron opening portion facilitates separation from the iron opening portion. In the process of hardening the casting mold, the shell mold is gradually broken and separated from the casting, Therefore, it is an object of the present invention to provide a method of manufacturing a casting mold using a mold that prevents the occurrence of crazing as the temperature of the casting is rapidly lowered.

The present invention provides a method of manufacturing a casting by injecting molten material into a mold to form a casting, comprising the steps of: applying a releasing agent for applying a releasing agent to a core portion, an iron opening portion and a roughing portion provided in the casting apparatus; A shell mold mounting step of providing a mold main body, forming a connecting hole on an upper portion of the shell mold main body, and then placing a guide shell mold on an upper portion of the core portion so as to communicate with the connecting port, A molding space forming step for forming a molding space between the shell mold body and the iron opening portion by moving the ironing portion in the direction of the shell mold body; Closing the covering step, filling the molding space with the sealing material through the guide shell mold by injecting the sealing material into the opening of the cover, A casting separating step of separating the cured casting from the molding space by moving the ironing part by driving the conveying cylinder, and a finishing step of removing the guide part formed on the casting by the guide shell mold .

The mold apparatus further includes a core having a through hole having a central portion formed therein, a core portion having a bottom inserted into the through hole so as to be caught in a jaw formed in the core, A conveying cylinder for conveying the irregular portion, and a cover for covering the iron opening portion and the upper portion of the core portion.

The mold apparatus further includes a shell mold main body such that the hardened casting is separated from the core. The shell mold main body includes a hollow mold main body enclosing the outer surface of the core, And a guide shell mold is attached to the inner circumference of the protrusion so as to communicate with the connection port, and the guide shell mold is attached to the inner periphery of the protrusion, A guide passage having an upper portion and both ends opened to guide the molding space is formed, and the guide passage is further formed with a lead-in groove for receiving a molten metal to be injected into the injection hole of the cover.

Further, on both sides of the connector, a cut-off protrusion is formed so as to form a neck passage, a curved separation curved surface is formed on the outer surface of the cut-off protrusion, and a curved guide curved surface is further formed on the inner surface.

A method of manufacturing a casting using a mold according to the present invention is characterized in that the shell mold and the guide shell mold attached to the casting are separated while being separated from the casting, Since the shell mold is gradually broken and separated from the casting during the curing of the casting, the temperature of the casting is gradually lowered. Therefore, when the temperature of the casting is drastically lowered, It is possible to prevent such a problem.

1 is a flowchart showing a method of manufacturing a casting using a mold according to the present invention.
2 is a cross-sectional view showing a casting apparatus in a casting method using a casting mold according to the present invention.
FIG. 3 is a view showing a shell mold body and a guide shell mold of a casting apparatus in a casting method using the casting mold according to the present invention.
FIG. 4 is a plan view showing a forming part and a ridge part in a method of manufacturing a casting using a mold according to the present invention.
5 is a plan view showing a lid in a casting method using a casting mold according to the present invention.
6 is a view showing an operating state of the casting apparatus in the casting method using the casting according to the present invention.
7 is a view showing another embodiment of a method of manufacturing a casting using a mold according to the present invention.
8 is a view showing still another embodiment of a method of manufacturing a casting using a mold according to the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of a method for manufacturing a casting mold using a mold according to the present invention will be described with reference to the accompanying drawings. In this process, the thicknesses of the lines and the sizes of the components shown in the drawings may be exaggerated for clarity and convenience of explanation. In addition, the terms described below are defined in consideration of the functions of the present invention, which may vary depending on the intention or custom of the user, the operator. Therefore, definitions of these terms should be made based on the contents throughout this specification.

In addition, the following embodiments are not intended to limit the scope of the present invention, but merely as an example, and various embodiments may be implemented through the present invention.

FIG. 1 is a flowchart showing a method of manufacturing a casting using a mold according to the present invention, FIG. 2 is a cross-sectional view showing a casting apparatus in a casting method using the casting mold according to the present invention, FIG. 4 is a plan view showing a roughing portion and a ridge portion in a method of manufacturing a casting using a mold according to the present invention. FIG. 4 is a cross- And Fig. 5 is a plan view showing a lid in a casting method using a mold according to the present invention. Fig. 6 is a view showing an operating state of the casting apparatus in the casting method using the casting mold according to the present invention And FIG. 7 is a view showing another embodiment of the casting method using the casting mold according to the present invention, and FIG. 8 is a view showing another embodiment Fig.

As shown in the drawing, a method 10 for manufacturing a casting using a mold according to the present invention (hereinafter referred to as a casting production method for the sake of convenience) is a method of casting a casting 100 The method of manufacturing the casting 100 may include a step of applying a releasing agent S1, a shell mold installing step S2, a forming space S forming step, a closing step S4, Step S5, separation of the casting 100, and finishing step S7.

The casting 100 is a manhole, and is manufactured by the casting apparatus 10 so that the manhole cover is seated.

The step of applying the releasing agent S1 is a step of applying the releasing agent to the core portion 30, the iron opening portion 40 and the sandwiching portion 20 provided in the mold apparatus 10.

The mold apparatus 10 includes a molding unit 20 having a through hole 21 having a jaw 211 at its center and a through hole 21 which is engaged with a shoulder 211 formed in the molding unit 20, An iron opening portion 40 disposed on the upper portion of the turntable portion 20 and disposed so as to form a molding space S between the outer circumferential surfaces of the core portion 30, A transfer cylinder 50 for transferring the iron opening 40 and a lid 60 for covering the iron opening 40 and the upper portion of the core 30.

The protrusions 20 are provided at the lower portion of the protrusions 20 so that the protrusions 20 are arranged to be spaced apart from each other on the surface of the table or on the table. 100, the broken shell mold body 70, the guide shell mold 74, and foreign matter can be discharged.

The jaw portion 211 is formed in a bar shape having a stepped portion and is welded or screwed to the inner periphery of the through hole 21 and fixed at a predetermined interval along the inner circumference of the through hole 21, So that the core portion 30 is supported.

A shaping surface is formed at an end of the ironing part 40 and a fastening protrusion 41 of a curved line is formed on an upper surface of the ironing part 40 so that the lid 60 is inserted.

The lid 60 is installed to be movable up and down by a working cylinder to a frame frame formed in the casting apparatus 10 and can be moved up and down by a crane in addition to the operating cylinder.

The lid 60 is formed with a pair of injection ports 61 to be supplied with the molten metal into the inlet grooves 742 of the guide shell mold 74 to be described later,

5, a plurality of coupling holes 62 are formed in the lid 60 as shown in FIG. 5, and an upper end of the shell mold rod 621 is inserted into the coupling hole 62, The lower end of the shell mold rod 621 is disposed in contact with the upper surface of the iron piece 40 and the shell mold tube 611 is further inserted into the injection port 61 of the lid 60.

That is, in order to solve the problem that the molten metal is injected into the injection port 61 during the process of flowing the molten metal through the injection port 61, the molten metal must be removed at the time of melting or solidification, and the shell mold rod 621 and the shell mold tube 611 are heated The shell mold rod 621 is formed in the shape of a rod and a tube by molding a mixture of the particles of the hardened synthetic resin and the sand in a mold for molding a heated rod and a mold for forming a tube, So that a bolt hole is formed in the wing of the molded body 100 (manhole frame). The shell mold tube 611 is fixed to the injection port 61 by being forced or inserted, So that it is possible to prevent the injection port 61 from melting due to the heat. It is also possible to form the shell mold tube 611 by heating the injection port 61 and injecting the mixture.

In the step of installing the shell mold S2, the shell mold main body 70 is installed in the core part 30 of the mold apparatus 10, the connection hole 731 is formed in the upper part of the shell mold main body 70, And the guide shell mold 74 is disposed on the upper portion of the core portion 30 so as to communicate with the connection port 731. [

The shell mold main body 70 and the guide shell mold 74 are formed by molding a mixture of synthetic resin particles which are solidified (melted and hardened) when heated, into a predetermined shape, and the molded casting 100 The manhole frame) is easily separated, the surface is kept smooth and the casting 100 is prevented from contracting during the casting process. Alternatively, the shell mold main body 70 and the guide shell mold 74 may be formed by hardening silica sand.

The mold apparatus 10 further includes a shell mold main body 70 so that the hardened casting 100 is separated from the core. The shell mold main body 70 includes a hollow mold And an annular protrusion 731 integrally formed on the upper portion of the engaging protrusion 72 and formed with a pair of connecting holes 731. The protrusion 72 is formed integrally with the upper portion of the mold main body 71, (73).

At this time, a guide shell mold 74 is attached to the inner circumference of the protrusion 73 so as to communicate with the connection hole 731. The guide shell mold 74 is fixed to the upper portion A guide passage 741 having both ends open is formed and the guide passage 741 is further formed with a guide groove 742 for receiving molten metal introduced into the injection port 61 of the lid 60. It is preferable that the phosphorus grooves are formed in pairs so that the molten metal is supplied to the molding space S in both directions as shown in FIG.

In this case, the guide shell mold 74 is formed in a shape of a plus (+) shape, four injection ports 61 are formed in the lid 60, So that the molten metal can be supplied to the molding space S.

The molding space forming step S3 is performed by driving the transfer cylinder 50 of the mold apparatus 10 to move the iron opening 40 in the direction of the shell mold main body 70, And a forming space S is formed between the first and the second openings 40 and 40.

The molding space S is supplied with the molten material through the passage of the guide shell mold 74 as described above.

The closing step S4 is a step of covering the upper part of the forming space with the ironing part 40 with the lid 60 provided in the casting apparatus 10.

2, a fixing groove is formed on the bottom surface of the lid 60 and a fastening protrusion 41 formed on the upper portion of the iron opening 40 is inserted into the fixing groove, Thereby preventing the iron opening 40 from being moved in the process of injecting molten iron.

In the step S5, the siphon is injected into the injection port 61 of the lid 60 to fill the molding space S through the guide shell mold 74.

When the molten metal is injected into the injection port 61 of the lid 60, the molten material is sequentially transferred to the molding space S along the guide path 741.

At this time, it is preferable that the lid 60 is closed while covering the guide passage 741 of the guiding shell mold 74 when the lid 60 is fastened, and it is preferable that the lid 60 is easily separated from the hardened guide part 200 and the lid 60 It is preferable to apply a release agent to the bottom surface of the lid 60.

The casting separating step S6 separates the cover 60 and drives the transfer cylinder 50 to move the ironing part 40 and then the casting 100 hardened in the forming space S, .

The finishing step S7 is a step of removing the guide part 200 formed on the casting 100 by the guide shell mold 74. [

It is possible to quickly supply the molten metal to the molding space S and uniformly supply the molten metal to the molding space S through the guide shell mold 74 and to supply the molten metal to the guide passage 741 The weight of the casting 100 can be moved by gripping the guide unit 200 and a separate ring can be moved to the casting 100 for movement So that the casting 100 is not directly damaged by the grasping of the casting 100 directly.

Referring to FIG. 7, a cutting protrusion 731a is formed on both sides of the connecting hole 731 so as to form a passage for the neck 300, and a curved separation curved surface 731a 'is formed on the outer surface of the cutting protrusion 731a. And a curved guide curved surface 731a "is further formed on the inner surface.

That is, the neck portion 300 is formed in the guide portion 200 by the passage of the neck portion 300, and when the guide portion 200 is separated from the casting 100, the guide portion 200 And the separation curved surface 731a 'is curved along the inner circumferential surface of the casting 100 so that the surface finishing process (grinding process) of the portion is not performed And the guide curved surface 731a "is curved so as to be transferred to the molding space S without being caught.

8, a pressing groove 31 is formed in the core portion 30 and a pressing and removing device 80 is further installed in the pressing grooves 31. The pressing and removing device 80 presses the pressing And a pressing protrusion 83 welded to the operating shaft 82 of the operating cylinder 81. The pressing protrusion 83 is formed in a conical shape And an elastic pressure bar 84 made of a metal material having elasticity or a synthetic resin material having elasticity is welded or screwed to the outer surface of the elastic pressing bar 84. A hook 85 The shell mold main body 70 attached to the casting by the pressing projection 83 and the elastic pressing bar 84 and the hook portion by driving the operating cylinder 81 in the process of separating the casting, ) Is pressurized and separated from the casting.

At this time, it is preferable that the pressure grooves 31 are formed along the outer circumference of the core portion.

In addition, the drive motor is welded to the operating shaft 84 and the pressing protrusion is welded to the rotating shaft of the driving motor so that the pressing protrusion is rotated to press and separate the shell mold main body 70, The shredded shell mold main body is removed from the casting 100.

8, the elastic pressing bar 84 is inclined outwardly so that the inner surface of the pressing groove 31 is pressed while being drawn into the pressing groove 31, 31 and presses the shell mold main body 70 so that the area for pressing the shell mold main body 70 becomes wider and prevented from being caught in the press grooves 31 when the shell mold main body 70 is pulled in.

It will be apparent to those skilled in the art that various modifications and equivalent arrangements may be made therein without departing from the scope of the present invention as defined by the appended claims and their equivalents. . Therefore, it is to be understood that the present invention is not limited to the above-described embodiments. Accordingly, the true scope of the present invention should be determined by the technical idea of the appended claims. It is also to be understood that the invention includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention as defined by the appended claims.

10: Molding apparatus 20:
30: core part 40: iron part
50: Feed cylinder 60: Cover
70: Shell mold body 80: Pressurized detachment device
21: through hole 211: prong
31: Pressurized grooves
41:
61: Inlet port 611: Shell mold tube
62: engaging hole 621: shell mold rod
71: Mold body 72:
73: protrusion 731: connector
731a: Cutting protrusion 731a ': Separation curved surface
732a "guide curved surface
74: guide shell mold 741: guide passage
742: entry home
81: operating cylinder 82: operating shaft
83: pressing projection 84: elastic pressing bar
85:
S: Molding space
100: casting 200: guide part
300: neck
S1: Release agent application step S2: Shell mold installation step
S3: molding space forming step S4: closing step
S5: Sewage addition step S6: Casting separation step
S7: Finishing step

Claims (5)

A casting method for casting a molten metal into a casting mold,
A mold releasing agent application step of applying a releasing agent to the core portion, the iron opening portion and the roughing portion provided in the mold apparatus,
A shell mold mounting step of providing a shell mold main body in a core part of the mold apparatus, forming a connecting hole in an upper part of the shell mold main body, and then placing a guide shell mold on the upper part of the core part so as to communicate with the connecting hole,
A forming space forming step of forming a molding space between the shell mold main body and the iron forming part by moving the ironing part in the direction of the shell molding body by driving a transfer cylinder of the molding machine;
A closing step of covering the iron opening portion and the upper portion of the molding space with a cover provided in the mold apparatus,
A filling step of filling the molding space through the guide shell mold by injecting a sludge into an inlet of the cover,
A casting separating step of separating the hardened casting from the molding space after removing the cover and driving the conveying cylinder to move the ironing part;
And a finishing step of removing the guide portion formed in the casting by the guide shell mold.
The method according to claim 1,
Wherein the mold apparatus comprises a roughing section in which a through-hole having a jaw section is formed at the center,
A core portion in which a lower portion is fitted into the through hole so as to be caught in a jaw formed in the rough surface portion;
An ironing portion disposed on the upper portion of the barrel portion and disposed so as to form a molding space between the outer circumferential surfaces of the core portion,
A conveying cylinder for conveying the ridge portion;
And a lid covering the iron opening portion and the upper portion of the core portion.
3. The method of claim 2,
The mold apparatus further comprises a shell mold body such that the hardened casting is separated from the core,
The shell mold main body includes a hollow mold main body enclosing the outer surface of the core,
An engagement protrusion formed on an upper portion of the mold body,
And an annular protrusion formed on an upper portion of the latching jaw and formed with a pair of connection ports,
And a guide shell mold is adhered to the inner peripheral edge of the protrusion so as to communicate with the connector,
Wherein the guiding shell mold is formed with a guide passage having an upper portion and both ends opened to guide the molten material to the molding space, and the guiding passage further has a receiving groove receiving the molten material charged into the injection port of the lid. A method of manufacturing a casting using the method.
The method of claim 3,
Wherein a cut-off protrusion is formed on both sides of the connector to form a neck passage, a curved separation curved surface is formed on an outer surface of the cut-off protrusion, and a curved guide curved surface is further formed on an inner surface thereof. Method of manufacturing castings.
3. The method of claim 2,
The core portion is formed with pressure grooves, and the pressure grooves are further provided with a pressure-
The pressurized detachment device includes an operating cylinder which is inserted into the pressurizing groove,
And a pressing protrusion formed on an operating shaft of the operating cylinder,
Wherein the pressing protrusion is formed in a conical shape, and an elastic pressing bar is formed on an outer surface of the pressing protrusion so as to be inclined outward, and a hook is further formed on an end of the elastic pressing bar.

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