KR101570757B1 - Semi permanent casting mold and casting method by using the mold - Google Patents

Abstract

The present invention relates to a semi-permanent mold to form a casting product made of heat-resistant alloy steel, forming a one side mold with a permanent mold and forming an other side assembled mold with a sand mold; and to a casting method using the same. According to the present invention, the semi-permanent mold is characterized by arranging a core (120) on a center of a mold fixing plate (110); installing a lower mold (130) on the mold fixing plate (110) to include the core (120); forming a cavity (150) between the lower mold (130) and an upper mold (140) by assembling the lower mold (130) and the upper mold (140); forming the lower mold (130) with a permanent mold (130); and forming the upper mold (140) with a sand mold.

Description

TECHNICAL FIELD [0001] The present invention relates to a mold for casting a mold and a casting method using the mold,

The present invention relates to a mold for casting a cast product of a heat-resistant alloy steel material, a mold for one-side mold casting in which one of the molds is made of a mold and the other mold is sand mold, .

Generally, a mold is divided into a sand mold and a metal mold according to a mold material.

Korean Patent Application Publication No. 10-2004-0077101 (published on September 4, 2004), "Method of manufacturing special steel as a material for a steel processing machine" is introduced.

In the above-described special steel manufacturing method, molten metal (molten metal) is injected into a mold (sand mold) formed with a casting sand blended.

However, when the entire casting mold is manufactured as described above, a large amount of the wasteproofing material is produced, which causes a rise in cost. Further, when the material of the heat resistant alloy steel is cast, There is a problem that it is interposed in the washed casting and is attached to the surface of the casting, the cooling rate is slow, the mechanical properties are weaker than the casting method using the metal mold, and minute segregation occurs.

Korean Patent Application Publication No. 10-1995-0005408 (published on Mar. 20, 1995) discloses a mold for casting mold, a method for producing the same, and a casting method using the same.

Wherein the casting mold for casting includes an integral casting layer having a surface molded with a shape corresponding to the shape of the casting and a thermosetting resin and a casting sand, the casting layer being adsorbed on the mold surface, Has the same shape as the shape of the casting, and has a thickness distribution in the range of 0.5 to 3 mm.

However, when the molten metal of the heat-resistant alloy steel material having a high melting temperature is repeatedly injected into the mold circulation system of the mold by forming all of the molding molds in the mold, There is a problem that frequent replacement of expensive molds occurs because melting loss occurs in the sprue.

An object of the present invention is to provide a mold for casting an anti-metal mold and a casting method using the same, in which one of the molds is formed of a mold and the other mold is formed of a sand mold, .

According to an aspect of the present invention, there is provided a mold for casting an anti-mold casting, the casting casting comprising a core disposed at the center of the mold holding plate, a lower mold including the core, A cavity is formed between the lower mold and the upper mold, a lower mold is formed as a mold, and an upper mold is formed as a sand mold.

The mold fixing plate has a vent hole at the center, a mold mounting groove corresponding to the lower mold, and a lower end of the lower mold is fixed to the mold mounting groove.

And the second ceramic conduit is disposed vertically inside the second ceramic conduit, and the second ceramic conduit is disposed vertically inside the first ceramic conduit, and the second ceramic conduit is disposed vertically inside the first ceramic conduit, And the lower end of the second ceramic conduit is vertically connected to the middle of the first ceramic conduit.

An example of a casting method using a mold for casting molds according to the present invention

(a) disposing a sand mold having a first ceramic conduit horizontally arranged on a mold fixing plate on which a vent hole and a mold mounting groove are formed;

(b) mounting a lower mold made of a mold in a mold mounting groove of a mold fixing plate so as to surround the core,

(c) assembling the upper mold suspended in the lower mold so as to form a cavity,

(d) injecting a melt of a heat resistant alloy steel into a cavity through a second ceramic conduit serving as a sprue and a first ceramic conduit serving as an injection port,

(e) When the molten metal in the cavity coagulates and the casting is formed, the casting mold is lifted by a crane, then the mold clamping plate is removed, the mold is demolded, the core is removed and the casting is separated from the mold .

Another example of a casting mold for casting molds according to the present invention is a casting mold having a sand mold and a plurality of first ceramic conduits acting as an injection port on a support plate arranged in a radial direction at the center, an outer mold is formed by a mold and an inner mold disposed inside the outer mold is formed into a sand mold and a cavity is formed between the outer mold and the inner mold, Wherein a second ceramic conduit serving as a sprue is disposed on the upper and lower sides, a lower end of the second ceramic conduit is connected to the center of the first ceramic conduit, and a side end of the first ceramic conduit is connected to the cavity.

Another example of the casting method using the mold for casting molds according to the present invention

(a) forming a plurality of first ceramic conduits serving as injection ports radially from the center,

(b) placing a second ceramic conduit in the center of the inner mold, the second ceramic conduit acting as a sprue, perpendicular to the first ceramic conduit of the support plate,

(c) assembling an outer shape made of a mold into an inner mold so as to form a cavity,

(d) injecting a melt of a heat resistant alloy steel into a cavity through a second ceramic conduit serving as a sprue and a first ceramic conduit serving as an injection port,

(e) a mold releasing process step of dismantling the mold in the order of appearance, base plate and inner mold when the molten metal of the cavity is solidified and the casting is molded.

Accordingly, the casting mold for casting molds according to the present invention and the casting method using the casting molds according to the present invention are characterized in that one of the casting molds is formed of a mold and the other casting molds are sand molds, . That is, one of the molds is formed of a metal mold, which can be repeatedly used, and the mechanical properties are improved at a rapid cooling rate, defects such as fine segregation can be prevented from occurring, And the first and second ceramic conduits can be replaced with new ones every time the casting is performed. Thus, a large number of manufacturing costs and mold spots In addition, since the first and second ceramic conduits serve as an inlet and a spout, there is an effect that the problems such as the incorporation of molding sand can be solved.

1 is a partially cutaway perspective view showing a mold for casting molds according to a first embodiment of the present invention;
2 is a cross-sectional view showing a mold for casting molds according to a first embodiment of the present invention;
FIG. 3 is a flow chart showing a casting method using a mold for casting a mold half according to the first embodiment of the present invention
4 is a partially cutaway perspective view showing a mold for casting molds according to a fourth embodiment of the present invention.
5 is a cross-sectional view illustrating a mold for casting molds according to a second embodiment of the present invention
6 is a process diagram showing a casting method using a mold for casting molds according to a second embodiment of the present invention

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.

1 and 2, the mold for casting mold according to the first embodiment of the present invention includes a core 120 disposed at the center of a mold fixing plate 110, a lower mold 130 including a core 120, A cavity 150 is formed between the lower mold 130 and the upper mold 140 by the combination of the lower mold 130 and the upper mold 140. The lower mold 130 is inserted into the mold 130, (Mold), and the upper mold 140 is formed into a sand mold.

A vent hole 111 is formed in the center of the mold fixing plate 110 and a mold mounting groove 112 is formed in correspondence with the lower mold 130. The mold mounting groove 112 is formed at the lower end .

The core 120 is molded from molding sand, and a first ceramic conduit 122 is horizontally disposed therein, and a first ceramic conduit 122 is used as an inlet.

The upper mold 140 has a second ceramic conduit 142 vertically disposed therein so that the second ceramic conduit 142 is used as a sprue and the lower end of the second ceramic conduit 142 is connected to the first ceramic conduit 122, And a plurality of air tanks 144 are formed.

The pressurized water tank 144 is composed of an open-air hot water tank and an open-air hot water tank. In FIGS. 1 and 2, only open hot water tank is shown, and hot water tank is not shown.

1 and 2, the cavity 150 is formed to correspond to the shape of a cone used for manufacturing a hearth roll. However, the present invention is not limited to this, A shape corresponding to a shape of a reducer, an axle, or the like cast using an alloy steel.

In the mold for casting mold according to the first embodiment of the present invention, the lower mold 130 is formed as a mold, the upper mold 140 is formed as a sand mold, You can take advantage. That is, the lower mold 130 is formed of a mold and can be continuously used repeatedly. The mechanical properties are improved at a rapid cooling rate, defects such as fine segregation can be prevented from occurring, The occurrence can be reduced. Since the core 120 and the upper mold 140 are formed in a sand mold, the first and second ceramic conduits 122 and 142 can be replaced with new ones each time the casting is performed, The manufacturing cost and the problem of the melting of the sprue can be solved. Furthermore, since the first and second ceramic conduits 122 and 142 serve as an inlet and a sprue, problems such as the incorporation of molding sand into the melt can be solved.

Referring to FIG. 3, the casting method using the mold for casting mold according to the first embodiment of the present invention as described above is as follows.

(a) A sand type hollow body 120 having a first ceramic conduit 122 arranged horizontally is disposed on a mold fixing plate 110 having a vent hole 111 and a mold mounting groove 112.

(b) A lower mold 130, which is a mold, is mounted on the mold mounting groove 112 of the mold fixing plate 110 so as to surround the core 120.

(c) The upper mold 140, which is formed in the lower mold 130 so as to form the cavity 150, is assembled. At this time, the second ceramic conduit 142 acting as a spur is vertically connected to the middle first ceramic conduit 122.

(d) The molten metal of the heat-resistant alloy steel is injected into the cavity 150 through the second ceramic conduit 142 serving as a sprue and the first ceramic conduit 122 serving as an injection port.

(e) When the molten metal in the cavity is solidified and the casting is molded, the mold is lifted with a crane, the mold fixing plate 110 is removed, the lower mold 130 is demolded, the core 120 is removed, And is separated from the upper mold 140 (mold release process)

According to the casting method using the mold for casting molds according to the first embodiment of the present invention as described above, the lower mold is manufactured from a mold, the upper mold is formed into a mold, the lower mold and the upper mold are combined, Can be acquired.

4 and 5, the mold for casting mold according to the second embodiment of the present invention includes a support plate 210 formed in a sand mold shape and having a plurality of first An outer mold 230 is formed in a mold 220 and an inner mold 230 is disposed in the outer mold 220. The inner mold 230 is disposed at a center of the ceramic conduit 215 in the radial direction, A cavity 240 is formed between the outer shape 220 and the inner shape 230 and a second ceramic conduit 235 serving as a sprocket is formed at the center of the inner shape 230 in a vertical direction The lower end of the second ceramic conduit 235 is connected to the center of the first ceramic conduit 215 and the side end of the first ceramic conduit 215 is connected to the cavity 240.

4 and 5, the cavity 240 is formed to correspond to the shape of a cone used for manufacturing a hearth roll. However, the present invention is not limited to this, A shape corresponding to a shape of a reducer, an axle, or the like cast using an alloy steel.

The mold for casting molds according to the second embodiment of the present invention is a modification of the mold for casting molds according to the second embodiment of the present invention. The mold for casting molds according to the first embodiment of the present invention .

Referring to FIG. 6, the casting method using the mold for casting mold according to the second embodiment of the present invention is as follows.

(a) A plurality of first ceramic conduits 215 acting as an injection port are formed in a serpentine shape so as to be radially arranged at the center.

(b) a second ceramic conduit 235 serving as a sprocket disposed in the center of the inner mold 230 is mounted on the first ceramic conduit (not shown) of the support plate 210, 215).

(c) The outer shape 220 made of a metal mold is fitted to the inner mold 230 so that the cavity 240 is formed.

(d) The molten metal of the heat resistant alloy steel is injected into the cavity 240 through the second ceramic conduit 235 serving as a sprue and the first ceramic conduit 215 serving as an injection port. At this time, the molten metal is filled up to the iron bath.

(e) When the molten metal of the cavity 240 is solidified and the casting is molded, the mold is disassembled in the order of the outer shape 220, the support plate 210, and the inner mold 220. (Mold-

110: mold fixing plate 120:
130: lower mold 140: upper mold
150: cavity

Claims (6)

The lower mold 130 is mounted on the mold fixing plate 110 so that the lower mold 130 and the upper mold 140 are combined with each other so that the core 120 is disposed at the center of the mold fixing plate 110, A cavity 150 is formed between the lower mold 130 and the upper mold 140. The lower mold 130 is formed as a mold and the upper mold 140 is formed as a sand mold, A lower end of the lower mold 130 is inserted into the mold mounting groove 112 and is fixed to the lower end of the mold mounting groove 112. The mold mounting groove 112 is formed at the center of the vent hole 110, And a mold for casting the mold.
delete The lower mold 130 is mounted on the mold fixing plate 110 so that the lower mold 130 and the upper mold 140 are combined with each other so that the core 120 is disposed at the center of the mold fixing plate 110, A cavity 150 is formed between the lower mold 130 and the upper mold 140 and the lower mold 130 is formed as a metal mold and the upper mold 140 is formed as a sand mold, 120 are formed by molding sand and a first ceramic conduit 122 is disposed horizontally and a first ceramic conduit 122 is used as an inlet and the upper mold 140 is connected to a second ceramic conduit 142 inside Characterized in that the second ceramic conduit (142) is used as a sprue and the lower end of the second ceramic conduit (142) is connected vertically in the middle of the first ceramic conduit (122) template.
(a) disposing a sand-like hollow body 120 in which a first ceramic conduit 122 is horizontally disposed on a mold fixing plate 110 having a vent hole 111 and a mold mounting groove 112;
(b) mounting a lower mold (130) made of a metal mold into the mold mounting groove (112) of the mold fixing plate (110) so as to surround the core (120)
(c) assembling a topsheet 140 in a lower mold 130 so as to form a cavity 150,
(d) injecting a molten metal of a heat resistant alloy steel into the cavity 150 through a second ceramic conduit 142 serving as a sprue and a first ceramic conduit 122 serving as an injection port,
(e) When the molten metal in the cavity is solidified and the casting is molded, the mold is lifted with a crane, the mold fixing plate 110 is removed, the lower mold 130 is disassembled, the core 120 is removed, And a mold release process step of separating the mold from the upper mold (140).
A plurality of first ceramic conduits 215 serving as an injection port are disposed radially at the center and an outer mold 220 is formed on the support plate 210. [ An inner mold 230 disposed inside the outer shape 220 is formed into a sand mold and a cavity 240 is formed between the outer shape 220 and the inner shape 230 A second ceramic conduit 235 serving as a pouring gate is disposed at the center of the inner mold 230 so that the lower end of the second ceramic conduit 235 is connected to the center of the first ceramic conduit 215 , And the side end of the first ceramic conduit (215) is connected to the cavity (240).
(a) forming a plurality of first ceramic conduits (215) serving as an injection port in a cylindrical shape such that the support plates (210) are radially disposed at the center;
(b) a second ceramic conduit 235 serving as a sprocket disposed in the center of the inner mold 230 is mounted on the first ceramic conduit (not shown) of the support plate 210, 215, < / RTI >
(c) assembling an outer shape 220 made of a metal mold to the inner mold 230 so as to form the cavity 240,
(d) injecting a molten metal of a heat resistant alloy steel into the cavity 240 through a second ceramic conduit 235 serving as a sprue and a first ceramic conduit 215 serving as an injection port,
(e) a mold-disassembling process step of disassembling the mold in the order of the outer shape 220, the support plate 210, and the inner mold 220 when the molten metal of the cavity 240 is solidified and the casting is molded. Casting method using casting molds.

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