KR20200130978A - Mold for casting and method for casting - Google Patents

Abstract

The present invention relates to a mold and a casting method. The mold comprises: a metal structure that provides a space for accommodating a melt therein; and a flow path formed inside the metal structure to circulate a cooling medium, wherein the flow path can be formed to extend to a lower end of an area being in contact with the melt in the metal structure, thereby suppressing an increase in the surface temperature of the mold at the lower end of the mold.

Description

Mold for casting and method for casting}

The present invention relates to a mold and a casting method, and more particularly, to a mold and a casting method capable of improving the quality and durability of the mold.

In general, cast steel is produced by cooling molten steel contained in a mold. For example, in the continuous casting process, molten steel is injected into a mold having a certain inner shape, and the cast slab that has been reacted and solidified in the mold is continuously drawn to the lower side of the mold to manufacture cast slabs of various shapes such as slabs, blooms, billets, and round bars. have.

Inside the mold, a flow path through which a cooling medium such as cooling water can move is formed in order to cool the molten steel injected into the mold. However, the end of the flow path formed in the mold is rounded so that the cooling medium can be smoothly circulated. Accordingly, the length between the inner surface of the mold and the flow path increases at the lower end of the mold. In addition, since the flow path is not formed to the end of the mold from which the cast steel is drawn out, cooling of the cast steel is not performed smoothly at the lower end of the mold, resulting in an increase in the surface temperature of the mold. Accordingly, there is a problem in that the mold is thermally deformed or the coating layer applied to the mold surface is worn and corroded, thereby shortening the life of the mold. Accordingly, there is a problem in that equipment operation costs increase due to frequent replacement of the mold, and defects occur on the surface of the cast steel due to friction between the mold and the cast steel, thereby reducing productivity.

KR 10-2013-0034270 A KR 10-1165706 B

The present invention provides a mold and a casting method capable of extending the service life of the mold by improving wear resistance and corrosion resistance.

The present invention provides a mold and a casting method that can improve the quality and productivity of the cast steel.

A mold according to an embodiment of the present invention includes, as a mold for casting a cast steel, a metal structure providing a space to accommodate a melt therein; And a flow path formed inside the metal structure to circulate the cooling medium, wherein the flow path may be formed to extend to a lower end of a region in contact with the melt in the metal structure.

The metal structure may include a contact portion forming a region in contact with the melt; A non-contact portion forming a region not in contact with the molten material above the contact portion; And an extension part forming a region not in contact with the melt under the contact part, and the flow path may be formed to extend beyond an end of the contact part.

The thickness of the inner wall of the metal structure may be formed to have a predetermined size in the length direction of the metal structure at the contact portion.

The extension portion may include an inclined surface to form a gap between the cast piece drawn from the mold.

The metal structure may include a first metal structure forming an inner wall of the metal structure; And a second metal structure connected to the outside of the first metal structure and forming an outer wall of the metal structure, wherein the first metal structure is formed to extend from the non-contact part to the contact part, and the second The metal structure may be formed to extend from the non-contact portion to the extension portion.

The second metal structure may be formed to surround the lower surface of the first metal structure in the extension part.

The first metal structure includes a first channel groove for forming the channel on an outer surface facing the second metal structure, and a part of the first channel groove extends in a longitudinal direction of the first metal structure, so that the The second metal structure may be formed to pass through a lower surface of the first metal structure, and the second metal structure may contact the lower surface of the first metal structure so that the first flow path groove is closed by the extension part.

A portion of the first passage groove may be formed to extend in the width direction of the first metal structure.

The first metal structure includes a first channel groove for forming the channel on an outer surface facing the second metal structure, and a part of the first channel groove extends in a longitudinal direction of the first metal structure, so that the It is formed so as to pass through the lower surface of the first metal structure, the second metal structure includes a second channel groove in communication with the first channel groove in the extension, the second channel groove is the first metal structure It may be formed to extend in the width direction of.

The thickness of the first metal structure, which is a length from the inner surface of the first metal structure to the first channel groove at the contact part, may be formed to have the same size for each location.

The extension surface of the second metal structure extending to the extension part may be formed such that the lower end of the extension surface is inclined downward toward the outside of the mold so as to form a gap between the cast piece drawn from the mold.

The extended surface may be formed to have an angle of 45 to 65° with the horizontal line.

Casting method according to an embodiment of the present invention, as a method of casting a cast iron, the process of preparing a mold; Injecting molten steel into the mold; Cooling the molten steel injected into the mold; And drawing a cast piece from the mold. Including, the process of cooling the molten steel may include a process of circulating the cooling medium inside the mold so that the cooling medium flows from the mold to the lower end of the region in contact with the molten steel.

The process of preparing the mold may include manufacturing the mold to form a gap between the lower end of the mold and the cast piece drawn from the mold.

In the lower portion of the mold, the process of spraying the coolant to the cast iron drawn from the mold may be included, and the process of spraying the coolant may include introducing the coolant at the intervals.

According to the embodiment of the present invention, it is possible to suppress an increase in the temperature of the mold surface at the lower end of the mold. Therefore, it is possible to prevent the mold from thermally deforming, and to suppress or prevent abrasion or deterioration of the coating layer formed on the mold surface, thereby improving the life of the mold. Therefore, it is possible to reduce the cost of operating facilities incurred due to mold replacement.

In addition, it is possible to suppress surface defects or fractures of the cast steel which may occur due to friction between the cast steel and the inner wall of the mold. Therefore, it is possible to secure high-quality cast pieces, and it is possible to reduce or reduce the load of correction work for removing defects by suppressing or preventing the occurrence of defects such as edge scabs occurring in subsequent processes (rolling).

1 is a perspective view of a mold according to an embodiment of the present invention.
FIG. 2 is a cross-sectional view of the mold taken along line AA' and line B-B' shown in FIG. 1;
3 is a cross-sectional view of a first plate according to an embodiment of the present invention.
4 is a cross-sectional view of a second plate according to an embodiment of the present invention.
5 is a view for explaining a flow path according to an embodiment of the present invention.
6 is a view for explaining a flow path according to a modified example of the present invention.
7 is a perspective view and a cross-sectional view of a mold according to a modified example of the present invention.
8 is a view showing a state of casting a cast steel using a mold according to an embodiment of the present invention.
9 is a graph showing the results of measuring the surface temperature of the mold while casting the cast using a general mold and a mold according to an embodiment of the present invention.

Hereinafter, a mold according to an embodiment of the present invention and a casting method using the same will be described in detail with reference to the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but will be implemented in a variety of different forms, only the present embodiments make the disclosure of the present invention complete, and the scope of the invention to those of ordinary skill in the art It is provided to inform you. In order to explain the invention in detail, the drawings may be exaggerated, and the same reference numerals refer to the same elements in the drawings.

1 is a perspective view of a mold according to an embodiment of the present invention, FIG. 2 is a cross-sectional view of the mold along lines AA' and B-B' shown in FIG. 1, and FIG. 3 is 1 is a cross-sectional view of the plate, Figure 4 is a cross-sectional view of a second plate according to an embodiment of the present invention, Figure 5 is a view for explaining a flow path according to an embodiment of the present invention, Figure 6 is a modified example of the present invention It is a view for explaining the flow path.

The mold according to the exemplary embodiment of the present invention may include a metal structure providing a space for accommodating a melt therein, and a flow path formed inside the metal structure to circulate a cooling medium. In this case, the flow path may be formed to extend to a lower end of a region in contact with the melt in the metal structure.

Hereinafter, a case where the metal structure is formed by plate formation will be described as an example. In this case, the first metal structure may be a first plate, and the second metal structure may be a second plate.

1 and 2, a mold 100 according to an embodiment of the present invention circulates a plurality of plates 110 and 120 for providing a space for accommodating a melt therein, and a cooling medium. For this purpose, a flow path 130 formed inside each of the plurality of plates 110 and 120 may be included. In this case, the flow path 130 may be formed to extend from each plate 110 and 120 to a lower end of a region in contact with the melt.

2A is a cross-sectional view taken along line A-A' shown in FIG. 1, wherein the long side plate 110 includes a first plate 112 forming an inner wall of the mold 100 and a mold 100. It may include a second plate 114 forming an outer wall. In this case, the long side plate 110 may form a wall of the mold 100 by combining the first plate 112 and the second plate 114. Accordingly, the first plate 112 disposed on the inside is described as forming the inner wall of the mold 100, and the second plate 114 disposed on the outside is described as forming the outer wall of the mold 100. In addition, a flow path 130 for circulating the cooling medium may be formed inside the long side plate 110, and cooling in the flow path 130 and an injection hole 117 for supplying the cooling medium to the flow path 130 from the outside. An outlet 118 for discharging the medium may be formed. At this time, the injection port 117 and the discharge port 118 may each be formed in one or more.

2B is a cross-sectional view taken along line B-B' shown in FIG. 1, wherein the short side plate 120 includes a first plate 122 forming an inner wall of the mold 100, and It may include a second plate 124 forming an outer wall. In addition, a flow path 140 for circulating the cooling medium may be formed inside the long side plate 110, an injection port 127 for supplying the cooling medium to the flow path from the outside, and an outlet for discharging the cooling medium from the flow path. (128) can be formed. At this time, the injection port 127 and the discharge port 128 may each be formed in one or more.

These long side plates 110 are disposed to be spaced apart from each other, and the short side plates 120 are disposed to contact both sides of the long side plate 110 to form a mold 100 that provides a space to accommodate a melt therein. can do. At this time, the first plate 112 constituting the long side plate 110 and the first plate 122 constituting the short side plate 120 may be in close contact with each other so that the melt does not flow out to the contact portion.

On the other hand, the mold 100 forms a contact portion (II) that forms an area in contact with the molten material, such as molten steel, in the casting direction or the longitudinal direction of the mold 100, and an area that does not contact the molten steel at the top of the contact portion (II). It may be divided into a non-contact portion (I) and an extension portion (III) forming a region not in contact with molten steel under the contact portion (II). In addition, the flow paths 130 and 140 may be formed to extend beyond the end of the contact part II.

Since the long side plate 110 and the short side plate 120 have different lengths in the horizontal direction and may have almost the same structure, the long side plate 110 will be described as an example. At this time, the long side plate 110 is referred to as a plate 110. In addition, although the plate 110 is described as being formed by combining the first plate 112 and the second plate 114, the plate 110 may be formed as a single structure.

The plate 110 includes a first plate 112 forming an inner wall of the mold 100 in contact with a molten material, for example, molten steel, and a second plate forming an outer wall of the mold 100 on one side of the first plate 112 (114) may be included. Here, the terms of the inner surface, the outer surface, the upper surface, the lower surface and the side surface of the plate are when the mold 100 is formed of the plate 110. It can be defined based on the state in which the plate is placed. In addition, the longitudinal direction of the mold 100, the longitudinal direction of the plate 110, the longitudinal direction of the first plate 112 and the longitudinal direction of the second plate 114 may mean a vertical direction or a casting direction. In addition, the width direction of the mold 100, the width direction of the plate 110, the width direction of the first plate 112, and the width direction of the second plate 114 are orthogonal to the length direction of the mold 100 or It can mean a horizontal direction. In this case, when the plate is the long side plate 110, the width direction may be the width direction of the cast piece, and when the plate is the short side plate 120, the width direction may be the thickness direction of the cast piece.

Referring to FIG. 3, the first plate 112 may include an inner surface I _{1 in} contact with molten steel and an outer surface O ₁ facing the second plate 114. And the lower surface connecting the bottom of the first plate 112 has an inner surface (I ₁₎ and an outer surface (O _1), the top surface (T ₁₎ and the inner surface (I ₁₎ and an outer surface (O ₁₎ connecting the top of the It may include (B ₁ ) and both sides (not shown). In addition, the first plate 112 may be formed to extend from the non-contact portion (I) to the contact portion (II). In this case, the non-contact portion (I) may mean an area from the upper surface T ₁ of the first plate 112 to a position higher than the hot water surface of the molten steel. Further, the contact portion II may mean a position where the non-contact portion I ends, that is, a region from the lower end to the lower surface B ₁ of the first plate 112.

A first flow path groove 132 for forming a flow path 130 may be formed on the outer surface O ₁ of the first plate 112.

Referring to FIG. 3, the first channel groove 132 may be formed at a position spaced apart from the upper surface of the first plate 112, for example, from a portion of the non-contact portion (I) to the entire contact portion (II). In this case, the first flow path groove 132 may be formed to penetrate the lower surface of the first plate 112. Accordingly, the first flow path groove 132 may be formed to extend to the lower end P _B of the inner surface I ₁ of the first plate 112. In this way, if the first flow channel 132 is formed to extend to the lower end of the inner surface of the first plate 112 in contact with the molten steel, the coagulation cell or the cast iron solidifying the molten steel can be cooled until immediately before being drawn out from the mold 100. I can. Accordingly, it is possible to suppress or prevent a phenomenon in which the surface temperature of the mold 100 increases at the lower end of the mold 100. In addition, through this, it is possible to suppress abrasion or corrosion of the surface of the mold 100 and suppress the occurrence of defects on the surface of the cast steel.

The first flow path groove 132 may be formed to have a deeper surface than the entire outer surface of the first plate 112. For example, the first channel groove 132 surrounds a part of the first surface 132a on the outside of the first surface 132a and the first surface 132a deeper than the entire outer surface of the first plate 112 It may be formed as a second surface 132b connecting the outer surface O ₁ of 112 and the first surface 132a. The first surface 132a may be formed in parallel or parallel to the inner surface I ₁ of the first plate 112 at least at the contact portion II. In addition, at least a portion of the first surface 132a formed on the non-contact portion (I) may be formed parallel to the inner surface (I ₁ ) of the first plate 112, and some of the first surface ( It may not be parallel to I ₁ ). This is because round processing is performed to have a curved surface at the upper end of the first flow path groove 132 for smooth inflow of the cooling medium.

As described above, since the first surface 132a is formed in parallel with the inner surface of the first plate 112 in the contact portion II, the length from the inner surface of the first plate 112 to the first surface 132a, for example, the shortest length Alternatively, the first plate 112 may have the same thickness. As shown in FIG. 3, the thickness of the first plate 112 at the uppermost end of the contact portion II, for example, the length L2 from the inner surface I ₁ of the first plate 112 to the first surface 132a, and , The length L3 from the inner surface of the first plate 112 to the first surface 132a at the lowermost end of the contact portion II may be the same (L2=L3). In addition, the length from the inner surface of the first plate 112 to the first surface 132a may be formed equally from the uppermost end of the contact portion II to the lowermost end of the contact portion II. In this way, if the lengths L2 and L3 from the inner surface I ₁ of the first plate 112 to the first surface 132a in the contact part II, that is, the thickness of the first plate 112 are the same, It is possible to uniformly cool the molten steel and the solidification cell in the longitudinal direction of the mold 100.

On the other hand, in the non-contact portion (I), since the first surface (132a) is rounded to have a curved surface, the first surface (132a) from the inner surface (I ₁ ) of the first plate 112 toward the top of the non-contact portion (I). ) length (L ₁₎ is a non-contact portion (ⅱ) in the length (L2, L3) with the same or increased to the first plate (first surface (132a from the inner surface (I ₁₎ of 112)) to the (L2 = L3 ≤L1) can be done.

The first flow path groove 132 may be formed to have the same width in the longitudinal direction of the first plate 112. Alternatively, the first passage groove 132 may be formed to increase or decrease in width in the longitudinal direction of the first plate 112.

Referring to FIG. 4, the second plate 114 may be formed to extend from the non-contact portion (I) to the extension portion (III).

The second plate 114 may include an inner surface (I ₂ ) facing the outer surface (O ₁ ) of the first plate 112 and an outer surface (O ₂ ) forming a surface opposite to the inner surface (I ₂ ). . And the lower surface connecting the lower end of the second plate 114 is the inner surface (I ₂₎ and an outer surface (O ₂₎ a top surface (T ₂₎ and the inner surface (I ₂₎ and an outer surface (O ₂₎ connecting the top of the (B ₂ ) and may include both sides (not shown). The second plate 114 may be formed to extend longer than the lower surface B1 of the first plate 112.

The inner surface (I ₂ ) of the second plate 114 is formed flat across the non-contact portion (I) and the contact portion (II), and the stepped portion 115 protruding from the extension portion (III) toward the first plate 112 is formed. Can include. The stepped 115 is formed in the upper and lower surfaces of the first plate 112 to be in contact with the lower surface (B ₁ ) of the first plate 112 so that the first flow channel groove 132 formed in the first plate 112 can be closed. It may include an extending surface (I ₂ ′) extending. In this case, the extension surface I ₂ ′ may be formed so as not to contact the molten steel or the solidification cell inside the mold 100 during casting. That is, if the extension surface (I ₂ ′) is formed to extend along the direction in which the inner surface (I ₁ ) of the first plate 112 is extended, the above-mentioned problems may occur because the length of the mold is not different from that of the increase. There is only one. Accordingly, the extension surface I ₂ ′ may be formed as an inclined surface inclined toward the outside of the mold 100 so as not to contact the molten steel or the solidification cell inside the mold 100. That is, chamfering may be performed so that the lower end of the extension surface I ₂ ′ inclines downward toward the outside of the mold 100. Alternatively, the extended surface (I ₂ ′) may include various types of uneven structures such as a step shape.

Meanwhile, a nozzle 300 (refer to FIG. 6) for spraying coolant onto a cast piece drawn from the mold 100 may be provided under the mold 100. When casting a cast steel using a common mold, most of the cooling water sprayed from the nozzle may be sprayed onto the cast steel. However, the mold 100 according to the exemplary embodiment of the present invention may exhibit an effect of extending lower than a general mold by the extension part III of the second plate 114. Accordingly, the extension part III may enter the path through which the coolant is sprayed, and some of the coolant sprayed from the nozzle 300 may be sprayed to the extension part III. As described above, the extension surface I ₂ ′ may be formed to be inclined toward the outside of the mold 100. Due to this, a gap is formed between the cast piece drawn from the mold 100 and the extension part (III), and a part of the coolant sprayed from the nozzle 300 may flow into the gap between the inner surface of the extension part (III) and the cast part. . Therefore, since the extension part III, for example, the lower end of the mold 100 is cooled by the cooling water introduced at intervals, an increase in temperature at the lower end of the mold 100 can be more effectively suppressed or prevented. In this way, the extension surface I ₂ ′ is preferably formed to have an angle of 45° to 65° with the horizontal surface so that the cooling water can flow smoothly between the extension part III and the cast piece.

By combining the first plate 112 and the second plate 114 as described above, a flow path 130 may be formed in the plate 110.

The flow path 130 may have various shapes and directions to circulate the cooling medium in the entire area of the plate 110 and may be formed.

Referring to Figure 5 (a), the first flow path groove 132 for forming the flow path 130 is formed to extend in the longitudinal direction and the width direction of the first plate 112 so that the cooling medium can be circulated. I can. In this case, the first flow path groove 132 may not be continuously formed in the width direction of the first plate 112 at the lower end of the contact portion II. In this case, as shown in (b) of FIG. 5, a second passage groove 134 communicating with the first passage groove 132 may be formed in the stepped 115 of the second plate 114. In this case, the second flow path groove 134 may be formed to extend along the width direction of the second plate 114. At this time, since the second flow path groove 134 formed in the stepped portion 115 forms an edge or end of the flow path 130, at least a part of the second flow path groove 134 may have a curved surface for smooth inflow of the cooling medium. Can be rounded.

Referring to FIG. 6(a), the first flow path groove 132 for forming the flow path 130 may be formed to extend in the longitudinal direction and the width direction of the first plate 112 so as to circulate the cooling medium. have. In this case, the first flow path groove 132 may be continuously formed along the width direction of the first plate 112 even at the lower end of the contact portion II. In this case, as shown in (b) of FIG. 6, the upper surface of the stepped step 115 is flattened so that it can be in close contact with the lower surface of the first plate 112 without forming a separate flow channel in the stepped step 115. Can be formed.

The mold may be formed in various shapes depending on the shape and area of the cast piece to be cast.

7 is a perspective view and a cross-sectional view of a mold according to a modified example of the present invention.

When a billet having the same width and thickness is cast, the metal structure 100a may be formed in a hollow polyhedral shape having a square cross-sectional shape as shown in FIG. 7A. In this case, the metal structure 100a may include a first metal structure 112a and a second metal structure 114a connected to the outside of the first metal structure 112a to form an outer wall of the mold. A flow path 130a through which a cooling medium can be circulated may be formed in the metal structure 100a.

In addition, when casting a round bar having a circular cross-sectional shape, the metal structure 100b may be formed in a hollow cylindrical shape having a circular cross-sectional shape as shown in FIG. 7B. The metal structure 100b may include a first metal structure 112b forming an inner wall of the mold, and a second metal structure 114b connected to the outside of the first metal structure 112b to form an outer wall of the mold. have. In addition, a flow path 130b capable of circulating a cooling medium may be formed inside the metal structure 100b.

The flow paths 130a and 130b may be formed to extend beyond the lower end of the region in contact with the melt in the metal structures 100a and 100b. In addition, the thickness of the first metal structures 110a and 110b from the contact portion II, that is, the length from the inner surfaces of the first metal structures 110a and 110b to the surfaces of the flow paths 130a and 130b, is the metal structures 100a and 100b. ) May be formed to have the same size in the longitudinal direction.

Hereinafter, a casting method according to an embodiment of the present invention will be described.

8 is a view showing a state of casting a cast iron using a mold according to an embodiment of the present invention.

Casting method according to an embodiment of the present invention, the process of preparing the mold 100, the process of injecting a molten material such as molten steel into the mold 100, the process of cooling the molten steel in the mold 100, and the cast iron in the mold It may include a process of drawing. In addition, the cooling process may include circulating the cooling medium inside the mold 100 so that the cooling medium flows from the mold 100 to the lower end of the region in contact with the molten steel.

First, a mold 100 having a flow path 130 through which a cooling medium such as cooling water can be circulated may be provided. In this case, the flow path 130 may be formed to extend beyond the lower end of the contact portion II in contact with the molten steel. In addition, the mold 100 may have the same thickness between the inner surface of the mold 100 and the flow path 130 in the contact portion (II). In addition, the mold 100 may be manufactured to form a gap between the lower end of the mold 100 and the cast piece drawn from the mold 100.

Thereafter, the completed molten steel may be injected into the mold 100 through the immersion nozzle 200 provided on the mold 100. The molten steel injected into the mold 100 may be cooled by a cooling medium circulating in the flow path 130. Accordingly, the molten steel is solidified from a portion in contact with the inner wall of the mold 100 to be cast into a coagulation cell or a cast iron, and may be drawn to the lower portion of the mold 100. At this time, since the flow path 130 formed in the mold 100 extends to the lower end of the contact portion II, the coagulation cell or the cast plate can be cooled until immediately before being drawn out from the mold 100. Accordingly, a phenomenon that the temperature is locally increased in the lower portion of the mold 100 can be suppressed. In addition, since the mold 100 has the same thickness between the inner surface of the mold 100 and the flow path 130 at the contact part (II), the molten steel and the solidification cell can be cooled evenly in the longitudinal direction of the mold 100. I can.

In the process of casting the cast steel in this way, the coolant may be sprayed onto the cast steel drawn from the mold 100 using the nozzle 300 provided under the mold 100. In this case, the coolant sprayed from the nozzle 300 may be sprayed to the lower part of the cast and the mold. This is because the mold 100 includes an extension portion (III) extending lower than the contact portion (II), the cooling water sprayed from the nozzle 300 can reach the extension portion (III). And since the lower end of the mold 100, that is, the extension part (III) is spaced apart from the cast piece drawn from the mold 100 to form a gap, a part of the coolant sprayed from the nozzle 300 is between the extension part (III) and the cast piece It is introduced at intervals formed in and can be cooled to the lower part of the mold 100 as well as the cast iron.

9 is a graph showing a result of measuring a surface temperature of a mold while casting a cast using a general mold and a mold according to an embodiment of the present invention.

9A shows the result of measuring the surface temperature of the mold from the center in the width direction of the mold while casting the cast using a general mold, that is, a mold in which the flow path does not extend from the mold to the lower end of the contact part. have. Referring to (a) of FIG. 9, the surface temperature of the mold was measured at the highest point at a lower point of about 130 mm from the top of the mold in which the coagulation cell was formed the thinnest. It can be seen that the surface temperature of the mold gradually decreases as the casting proceeds, and then the surface temperature of the mold increases from the lower end of the mold, that is, about 850 mm to the lower end of the mold. This is because the flow path is not formed to the lower end of the mold, and since the end of the flow path is rounded at the lower end of the mold, the length between the inner surface of the mold and the flow path, that is, the thickness becomes thicker, and the cooling capacity decreases.

9B shows the result of measuring the surface temperature of the mold from the center in the width direction of the mold while casting the cast using the mold according to the embodiment of the present invention. Referring to (b) of FIG. 9, as in (a) of FIG. 9, the surface temperature of the mold was measured at the highest point at a lower point of about 130 mm from the upper end of the mold in which the coagulation cell was formed the thinnest. However, it can be seen that the surface temperature of the mold gradually decreases as the casting proceeds, and then the surface temperature of the mold is maintained constant from about 550 mm to the lower end of the mold. It can be seen that this is because the flow path is formed to extend to the lower end of the mold, and the length between the inner surface of the mold and the flow path is formed equal, so that the cooling capacity is kept constant.

In the above, the present invention has been described with reference to the above-described embodiments and the accompanying drawings, but the present invention is not limited thereto, but is limited by the claims to be described later. Therefore, those of ordinary skill in the art will appreciate that the present invention can be variously modified and modified without departing from the spirit of the claims to be described later.

10, 100: mold 112: first plate
114: second plate 130: euro
132: first euro groove 134: second euro groove

Claims (15)

As a mold for casting cast steel,
A metal structure that provides a space for accommodating a melt therein; And
Includes; a flow path formed inside the metal structure to circulate the cooling medium,
The flow path is formed to extend to the lower end of the region in contact with the melt in the metal structure. The method according to claim 1,
The metal structure,
A contact portion forming a region in contact with the melt;
A non-contact portion forming a region not in contact with the molten material above the contact portion; And
It is divided into; an extension part forming an area not in contact with the melt under the contact part,
The flow path is a mold formed to extend beyond the end of the contact portion. The method according to claim 2,
The thickness of the inner wall of the metal structure is a mold formed in a predetermined size in the longitudinal direction of the metal structure at the contact portion. The method of claim 3,
A mold including an inclined surface so as to form a gap between the extension part and the cast piece drawn from the mold. The method according to claim 2,
The metal structure,
A first metal structure forming an inner wall of the metal structure; And
Including; a second metal structure connected to the outside of the first metal structure and forming an outer wall of the metal structure,
The first metal structure is formed to extend from the non-contact portion to the contact portion,
The second metal structure is a mold formed to extend from the non-contact portion to the extension portion. The method of claim 5,
The second metal structure is a mold formed so as to surround the lower surface of the first metal structure in the extension part. The method of claim 6,
The first metal structure includes a first flow path groove for forming the flow path on an outer surface facing the second metal structure,
A part of the first flow path groove is formed to extend in the longitudinal direction of the first metal structure and penetrate the lower surface of the first metal structure,
The second metal structure is in contact with the lower surface of the first metal structure so as to close the first passage groove in the extension part. The method of claim 7,
A mold formed so that a part of the first passage groove extends in the width direction of the first metal structure. The method of claim 6,
The first metal structure includes a first flow path groove for forming the flow path on an outer surface facing the second metal structure,
A part of the first flow path groove is formed to extend in the longitudinal direction of the first metal structure and penetrate the lower surface of the first metal structure,
The second metal structure includes a second passage groove communicating with the first passage groove in the extension part,
The second flow path groove is formed to extend in the width direction of the first metal structure. The method according to claim 8 or 9,
A mold formed so that the thickness of the first metal structure, which is a length from the inner surface of the first metal structure to the first flow channel groove at the contact portion, has the same size for each location. The method of claim 10,
The extension surface of the second metal structure extending to the extension part so as to form a gap between the cast piece drawn from the mold is formed such that a lower end of the extension surface is inclined downward to the outside of the mold. The method of claim 11,
The extension surface is a mold formed to have an angle of 45 to 65 degrees with the horizontal line. As a method of casting cast steel,
The process of preparing a mold;
Injecting molten steel into the mold;
Cooling the molten steel injected into the mold; And
Drawing a cast piece from the mold; Including,
The process of cooling the molten steel,
And circulating the cooling medium into the mold so that the cooling medium flows from the mold to the lower end of the region in contact with the molten steel. The method of claim 13,
The process of preparing the mold,
A casting method comprising the process of manufacturing a mold to form a gap between the lower end of the mold and the cast piece drawn from the mold. The method of claim 14,
Including the process of spraying cooling water from the bottom of the mold to the cast iron drawn from the mold,
The process of spraying the cooling water includes a process of introducing the cooling water at the intervals.

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