KR101914083B1 - Mold and Manufacturing method thereof - Google Patents

Abstract

The present invention relates to a mold for producing a cast steel, comprising: a pair of long side members spaced apart from each other in one direction; A pair of short side members provided between the long side members and spaced apart from each other in a direction intersecting the one direction; And a through hole formed in the short side member and at least a part of which is refracted, so that the life of the mold and productivity of the cast product can be improved.

Description

Mold and Manufacturing method thereof < RTI ID = 0.0 >

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mold and a method of manufacturing the same, and more particularly, to a mold capable of improving life span and casting productivity and a manufacturing method thereof.

Generally, a casting process is a process of casting a cast steel by injecting molten steel into a mold having a certain shape, solidifying the molten steel in the casting mold, drawing it to the lower side of the casting mold. The template includes two long sides facing each other and two short sides facing each other between two long sides. At both side ends of the short sides, protrusions are formed, and the corner portions of the cast steel can be cast in a chamfered shape.

 However, if the temperature of the mold increases above a certain temperature by the heat of the molten steel, the hardness may be weakened. Therefore, the casting mold can be worn and broken by the cast steel to be solidified. Thus, the life of the mold may be reduced and the maintenance cost of the mold may be increased.

Conventionally, a through hole extending in the vertical direction is provided in the mold, and cooling water is supplied to the through hole to suppress or prevent the temperature of the mold from rising. However, since the protrusion formed on the short side is farther from the through hole than the other side of the short side, the protrusion can be raised in temperature compared to the other portion. As a result, the hardness of the projected portion becomes weak, and the cast steel to be solidified may be abraded and broken.

On the other hand, when the mold is a bell-shaped mold, unlike a general mold, the mold is curved at a constant curvature, and the protrusions are also formed in a curved shape. Accordingly, the distance between the through hole formed in the vertical direction and the protruding portion having the curvature can be changed according to the height. Therefore, the protrusions may be unevenly cooled to cause a temperature deviation, and the cast pieces may be solidified at a nonuniform temperature, thereby deteriorating the quality. Further, since the protrusions are unevenly cooled, the portion where the temperature rises higher than other portions can be easily broken.

KR 2004-0058588 A KR 10-0775091 B

The present invention provides a mold with improved life and a method for producing the same.

The present invention provides a mold with reduced temperature deviation and a method of making the same.

The present invention provides a mold capable of improving cast product productivity and a method for producing the same.

The present invention relates to a mold for producing a cast steel, comprising: a pair of long side members spaced apart from each other in one direction; A pair of short side members provided between the long side members and spaced apart from each other in a direction intersecting the one direction; And a through hole formed in the short side member, at least a part of which is bent.

Wherein the short side member comprises: a body portion having a curvature in the longitudinal direction; And a protrusion having a curvature in the longitudinal direction, a width becoming narrower toward the end, and protruding outward from the body portion.

The through hole includes a first through hole extending inward from an upper surface of the short side member and inclined with respect to a longitudinal direction of the body portion; And a second through hole extending inward from a lower surface of the short side member and tilted in a different direction with respect to the longitudinal direction of the first through hole and the first through hole.

The first through-hole and the second through-hole extend in a straight line, and the first through-hole and the second through-hole are connected at an intermediate portion of the length of the short side member.

The distance from the end of the protrusion to the through hole is smaller than the middle area in the upper and lower areas.

The upper surface and the lower surface of the protrusion include a first side projecting in the thickness direction in the body portion; And a second side connecting the first side and the body part.

The protrusions are connected to both sides of the body part, and a plurality of through holes are provided corresponding to the positions of the protrusions.

At least one of the vertical distance (L1) from the second side to the center of the first and second through holes is calculated by the following formula (1).

(1): L1 = A 占 cos (?) 占 sin (?)

(Where A is the length of the second side and? Is the angle between the first side and the second side of the body).

At least one of the vertical distance L2 from the side surface of the short side member to the center portion of the first and second through holes is calculated by the following formula (2).

(2): L2 = 1/3 占 A 占 cos (?)

(Where A is the length of the second side and? Is the angle between the first side and the second side of the body).

At least one of an angle [alpha] at which the first and second through holes are inclined with respect to the longitudinal direction is calculated by the following expression (3).

Equation (3):? = 1/2 × Z / R × 180 /

(Where Z is the length of the short side member in the vertical direction and R is the radius of curvature of the short side member)

At least one of the diameters D of the first and second through holes is calculated by the following equation (4).

(4): D = 2/3 x A x cos (?) - 11

(Where A is the length of the second side and? Is the angle between the first side and the second side of the body).

According to the present invention, there is provided a method of manufacturing a semiconductor device, comprising the steps of: providing a short side member provided with a long side member and a protrusion; Forming a first through hole from one side of the short side member; And forming a second through hole having a slope different from that of the first through hole from the other side opposite to the one side of the short side member.

And calculating a position of the first through hole and the second through hole before forming the first through hole and the second through hole.

The calculating of the positions of the first through holes and the second through holes may include calculating a position on a plane of at least one of the first through holes and the second through holes on the upper surface and the lower surface of the short side member; And calculating a tilt angle of at least one of the first through-hole and the second through-hole.

Calculating a position of the first through-hole and the second through-hole, and calculating a diameter of at least one of the first through-hole and the second through-hole.

Wherein the step of forming the first through hole and the second through hole includes forming the first through hole and the second through hole in a longitudinal direction; And connecting the first through hole and the second through hole at an intermediate portion of the length of the short side member.

The mold includes a full bending mold, and the material of the mold includes copper.

According to the embodiments of the present invention, it is possible to uniformly cool the projection formed on the short side member of the mold. Thus, it is possible to suppress or prevent abrasion by the cast steel which is solidified due to the rise of the temperature of the projecting portion. Therefore, the durability of the projections can be improved to improve the lifetime of the casting mold, and the effective casting operation time of the casting mold can be increased to improve the casting productivity.

Further, it is possible to cool the protrusions uniformly and to suppress or prevent the temperature deviation from occurring depending on the position. Thus, the quality of the cast steel produced by uniformly cooling the molten steel can be improved. Therefore, the defective occurrence rate is reduced and the productivity of the cast steel can be improved.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a view showing the structure of a casting facility according to an embodiment of the present invention; Fig.
2 is a graph showing the relationship between hardness and temperature of a mold according to an embodiment of the present invention.
3 is a perspective view showing a structure of a mold according to an embodiment of the present invention;
4 is a perspective view showing a short side member according to an embodiment of the present invention;
5 is a plan view showing a structure of a top surface and a bottom surface of a short side member according to an embodiment of the present invention.
6 is a sectional view showing a structure of a short side member according to an embodiment of the present invention.
7 is a flowchart showing a method of manufacturing a mold according to an embodiment of the present invention.
8 is a view showing a temperature distribution of a short side member according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. It will be apparent to those skilled in the art that the present invention may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, It is provided to let you know. To illustrate the invention in detail, the drawings may be exaggerated and the same reference numbers refer to the same elements in the figures.

FIG. 1 is a view showing a structure of a casting facility according to an embodiment of the present invention, and FIG. 2 is a graph showing a relationship between a hardness and a temperature of a mold according to an embodiment of the present invention.

Referring to FIG. 1, a casting installation according to an embodiment of the present invention includes a casting mold 100 to which molten steel is injected, a plurality of conveying rollers positioned below the casting mold 100, A cooling belt 20, and a cutter 30, which is located on the movement path of the casting and cuts the casting material moving along the conveying roller.

The cooling stand 20 is disposed on the lower side of the mold 100. The cooling stand 20 includes a plurality of conveying rollers that are continuously disposed to form a movement path of the casting that is drawn to the lower portion of the casting mold 100 to perform a series of forming operations while cooling the non-solidified casting. In addition, a spray nozzle (not shown) for spraying cooling water on a part of the traveling path of the cast steel may be provided for rapidly solidifying the cast steel. Thus, the cooling water can be sprayed on the upper and lower surfaces of the cast steel, and the cast steel can be solidified by spraying cooling water on both sides of the cast steel.

The cutter 30 is disposed in the movement path of the cast steel, and serves to cut the cast steel into a desired size by the operator. The cutter 30 may include a cutter body movably installed along a movement path of the casting machine and a pair of cutting torches movably installed in the width direction of the casting body on the front or rear face of the cutter body. Therefore, it is possible to perform the operation of cutting the slab with the cutting torch while moving the cutter body in accordance with the speed of the casting slider moving by the feed roller.

The mold 100 may be a frame for determining the appearance of the metal product by solidifying molten steel. The mold 100 can receive molten steel from the nozzle 10 of the tundish 10 disposed on the upper side. The material of the mold 100 may be a copper (Cu) alloy added with a small amount of zirconium (Zr) or chromium (Cr).

Referring to FIG. 2, when the temperature of the copper alloy rises to 350 ° C or higher, the hardness may be weakened. Thus, the casting 100 to be solidified may be worn and broken. Therefore, the mold 100 according to the embodiment of the present invention can be provided in the casting equipment to suppress or prevent the mold 100 from being broken.

FIG. 3 is a perspective view showing a structure of a mold according to an embodiment of the present invention, FIG. 4 is a perspective view showing a short side member according to an embodiment of the present invention, And FIG. 6 is a cross-sectional view showing a structure of a short side member according to an embodiment of the present invention.

3 and 4, a mold 100 according to an embodiment of the present invention includes a pair of long side members 110 separated from each other in one direction, And includes a pair of short side members 120 spaced apart from each other in a direction intersecting the one direction and a through hole 140 formed in the short side member 120 and at least a part of which is bent. At this time, the mold 100 may be a torsionally curved mold, the width direction X may be the forward and backward direction, the thickness direction Y may be the left and right direction, and the length direction Z may be the up and down direction.

The long side member 110 may be formed in a plate shape having a predetermined area. Two long-side members 110 are provided and can be spaced apart from each other in one direction (or front-rear direction). The long side member 110 may have a curvature with respect to the longitudinal direction. For example, the long-side member 110 may be bent in the width direction so that the upper and lower portions of the long-side member 110 may be positioned in front of the center portion. However, the structure and the shape of the long-side member 110 are not limited to these, and may vary.

The short side member 120 may be installed between the two long side members 110, and two short side members 120 may be spaced apart from each other in a direction intersecting with the one direction (or in the left and right direction). A predetermined space for accommodating molten steel is formed between the two long side members 110 and the two short side members 120 and the nozzle 10 of the tundish 10 can be located at the center of the space . The short side member 120 may have a curvature on a surface contacting the molten steel or the cast steel. For example, the short side member 120 can be bent in the thickness direction. That is, the short side member 120 may be formed along the shape of the space between the pair of long side members 110, and may be sandwiched between the long side members 110.

Further, the short side members 120 can be adjusted in spacing distance to adjust the width of the cast steel. For example, one side of each of the short side members 120 except for the inner side surfaces facing each other can be connected to the transfer unit (not shown) to move left and right.

The short side member 120 includes a body portion 121 having a curvature in the longitudinal direction and a protrusion 122 having a curvature in the longitudinal direction and narrowing toward the end and protruding outward from the body portion 121, . ≪ / RTI >

The body portion 121 may be formed in a plate shape. The surface of the body portion 121 which is in contact with the molten steel may have a curvature in the longitudinal direction. When the molten steel is supplied to the mold 100, the main body having the curvature along the shape of the body 121 can be pulled downward.

The protruding portion 122 may protrude from the body portion 121 toward the molten steel. The protrusions 122 serve to form chamfers at corner portions of the casting that solidify in the mold 100. For example, the protrusions 122 may be formed in the form of a triangular pyramid that becomes narrower toward the end. The protrusion 122 may also have a curvature in the longitudinal direction along the shape of the body portion 121.

The plurality of protrusions 122 may be connected to both sides of the body portion. Thus, the main body having chamfered corners can be pulled out to the lower side of the mold 100 with a curvature. For example, the pair of protrusions 122 may be connected to both sides of the body 121, and the through holes 140 may be provided corresponding to the protrusions 122.

The upper surface and the lower surface of the protruding portion 122 have a first side 122a protruding in the thickness direction in the body portion 121 and a second side 122b protruding in the thickness direction from the second side 122a connecting the first side 122a and the body portion 121. [ And a side 122b. The first side 122a may be disposed in parallel to the side surface of the body portion 121. [ The second side 122b may be connected to the end of the first side 122a protruding in a plane, and may be formed diagonally. Thus, the surface connected to the second side 122b can form an inclined surface. However, the structure and shape of the short side member 120 are not limited to this and may vary. Also, the body 121 and the protrusion 122 may be integrally formed.

The through hole 140 is formed in the short side member 120, and forms a path through which the cooling water moves inside. For example, one side of the through hole 140 may be connected to a supply line (not shown) for supplying cooling water, and the other side of the through hole 140 may be connected to a discharge line (not shown) for discharging cooling water. Therefore, the cooling water moving inside the through hole 140 can cool the mold 100. Therefore, it is possible to suppress or prevent the temperature of the mold 100 from being raised, and to suppress or prevent the mold hardness from being lowered.

The number of the through holes 140 is equal to the number of the protrusions 122. The through hole 140 can be disposed close to the protrusion 122 and can cool the protrusion 122. [ Accordingly, even if the protruding portion 122 is in contact with molten steel, excessive increase of the temperature of the protruding portion 122 can be suppressed or prevented.

Also, at least a part of the through hole 140 can be refracted. For example, the through hole 140 includes a first through hole 141 formed to extend inward from the upper surface 120a of the short side member and inclined with respect to the longitudinal direction of the body portion 121, And is connected to the first through hole 141 by being inclined in a different direction with respect to the longitudinal direction of the first through hole 141 and the body portion 121, And may include a hole 142.

It is difficult to form the through hole 140 so as to have a curvature. The first through-hole 141 and the second through-hole 142 are formed in a straight line shape, and the first through-hole 141 and the second through-hole 142 are formed in the middle of the length of the short- We can meet and connect in department.

The first through hole 141 may be a circular hole, and forms a path through which the cooling water moves. The first through hole 141 may extend in the longitudinal direction from the upper surface 120a of the short side member toward the inside of the short side member 120 (or the middle portion of the length of the short side member 120). At this time, the first through-hole 141 may be formed to be inclined with respect to the longitudinal direction of the body 121.

The second through-hole 142 may be a circular hole, and forms a path through which the cooling water moves. The second through hole 142 may extend in the longitudinal direction from the lower surface 120b of the short side member toward the inside of the short side member 120 (or the middle portion of the length of the short side member 120). The second through-hole 142 may be connected to the first through-hole 141 at an intermediate portion of the short side member 120 in the vertical direction. Accordingly, the cooling water supplied to the first through-hole 141 is discharged to the second through-hole 142, and the cooling water supplied to the second through-hole 142 moves to the first through-hole 141, . The second through-hole 142 may be inclined with respect to the longitudinal direction of the body 121, and may be inclined in a different direction from the first through-hole 141.

Since the first through-hole 141 and the second through-hole 142 are inclined, the first through-hole 141 and the second through-hole 142 can be uniformly spaced from the end of the protruding portion 122 having a curvature. That is, the first through-hole 141 and the second through-hole 142 can be inclined along the shape of the protrusion 122 having a curvature. Therefore, even if the height is changed, the distance between the through hole 140 and the end of the protrusion 122 can be uniform. Therefore, the cooling water moving inside the through hole 140 can uniformly cool the entire protruding portion 122.

For example, the upper region, the lower region, and the middle region between the upper region and the lower region can be distinguished based on the length of the short side member 120. 6A, the conventional through holes are formed in a straight line in the vertical direction, and distances d1 and d2 between the end portions of the projecting portions 122 in the through holes of the upper region and the lower region are smaller than the distance To the end of the protrusion 122, as shown in FIG. Accordingly, the upper and lower portions of the protruding portion 122 are not sufficiently cooled as compared with the middle portion, and thus the temperature rises easily.

6 (b), the through hole 140 according to the embodiment of the present invention may be bent according to the curvature of the protrusion 122. The distances d1 and d2 from the through hole 140 of the upper region and the lower region to the end of the protrusion 122 may be equal to each other. The distances d1 and d2 from the through holes 140 of the upper region and the lower region to the ends of the protrusions 122 are set to a distance d3 from the through holes 140 of the intermediate region to the ends of the protrusions 122, May be smaller or similar.

Accordingly, the through holes 140 of the upper region and the lower region are close to the ends of the protrusions 122, and can be easily cooled. The temperature of the protruding portion 122 of the upper region which is first brought into contact with the molten steel before coagulation easily rises and the temperature of the protruding portion 122 is increased by the distance between the first through hole 141 and the end of the protruding portion 122 of the upper region. It is possible to easily suppress or prevent the rising.

5 and 6, the first through-hole 141 and the second through-hole 142 are formed so that the first through-hole 141 and the second through-hole 142 come close to the end of the protrusion 122, The position can be determined. At least one of the vertical distance L1 from the second side 122b of the protrusion 122 to the center of the first and second through holes can be calculated by the following equation (1). Here, A is the length of the second side 122b, and? Is the angle between one side of the body 121 and the second side 122b.

(1): L1 = A 占 cos (?) 占 sin (?)

One surface of the body portion 121 may be a surface contacting the molten steel. The cooling water flowing in the first through hole 141 and the second through hole 142 may be cooled by the first through hole 141 and the second through hole 142 based on the position of the protruding portion 122 in order to cool the protruding portion 122 stably. The position of the second through hole 142 should be determined. Accordingly, the position of the first through hole 141 and the second through hole 142 can be calculated using the position of the protrusion 122 through the equation (1). Therefore, since the first through-hole 141 and the second through-hole 142 have a certain distance from the end of the protruding portion 122, the temperature of the protruding portion 122 of the cooling water decreases, The effect of coagulation can be reduced or suppressed.

At least one of the vertical distance L2 from the side surface of the short side member 120 to the center portion of the first and second through holes can be calculated by the following formula (2). Here, A is the length of the second side and? Is the angle between the body and the second side.

(2): L2 = 1/3 占 A 占 cos (?)

The side surface of the short side member 120 may be a surface contacting the long side member 110 of the short side member 120. [ In order to determine the first through hole 141 and the second through hole 142, a point where two lines meet on a plane must be found. Thus, the point at which the vertical distance calculated by the equation (1) meets the vertical distance calculated by the equation (2) is found, and the first through hole 141 or the second through hole 142 is formed around the point . Accordingly, the proper center positions of the first through-hole 141 and the second through-hole 142 can be determined using equations (1) and (2).

Further, at least one of the angle [alpha] at which the first and second through holes are inclined with respect to the longitudinal direction can be calculated by the following expression (3). Here, Z is the length of the short side member 120 in the vertical direction, and R is the radius of curvature of the short side member 120.

Equation (3):? = 1/2 × Z / R × 180 /

The first through-hole 141 and the second through-hole 142 are spaced apart from the end of the protrusion 122 by a predetermined distance from the first through-hole 141 And the angle of inclination in the thickness direction of the second through hole 142 should be determined. Accordingly, the tilting angle of the first through-hole 141 and the second through-hole 142 can be calculated using the radius of curvature of the protruding portion 122 of the mold 100. Therefore, the first through-hole 141 and the second through-hole 142 can be inclined to match the shape of the curvature of the protruding portion 122, so that the first through-hole 141 and the second through- The moving cooling water can cool the protruding portion 122 at a uniform temperature and suppress or prevent the temperature deviation according to the height from occurring in the protruding portion 122. [

At least one of the diameters D of the first and second through holes can be calculated by the following equation (4). Here, A is the length of the second side 122b and? Is the angle between the body 121 and the second side 122b.

(4): D = 2/3 x A x cos (?) - 11

The diameter of the first through-hole 141 and the second through-hole 142 may affect the distance from the end of the protrusion 122. That is, when the diameters of the first through-hole 141 and the second through-hole 142 increase, the ends of the first through-hole 141 and the second through- The protrusion 122 can be separated from the end of the protrusion 122. Therefore, since the diameters of the first through holes 141 and the second through holes 142 may affect the cooling of the protruding portions 122, the first through holes 141 and the second through holes 142 may be formed by using the equation (4) The diameter of the second through hole 142 can be calculated. Accordingly, the first through-hole 141 and the second through-hole 142 can maintain a proper distance from the end of the protrusion 122.

In addition, the diameters of the first through holes 141 and the second through holes 142 can increase or decrease the amount of the moving cooling water. That is, when the diameters of the first through-hole 141 and the second through-hole 142 are increased, a relatively large amount of cooling water can be moved, and the diameter of the first through-hole 141 and the second through-hole 142 A relatively small amount of cooling water can be moved. If the diameters of the first through holes 141 and the second through holes 142 are too large, the temperature of the protruding portion 122 can be easily lowered, but the casting can be influenced and the first through holes 141, And the diameter of the second through-hole 142 become too small, it is difficult to lower the temperature of the protruding portion 122 without affecting the solidification product. Therefore, the proper diameter of the first through-hole 141 and the second through-hole 142 can be calculated by using the equation (4).

The cooling water moving in the first through hole 141 and the second through hole 142 of the mold 100 can uniformly cool the protruding portion 122. Therefore, the temperature of the protruding portion 122 rises and it is possible to suppress or prevent the abrasion due to the coagulated cast steel. Therefore, the durability of the protrusion 122 can be improved, the life of the mold 100 can be improved, and the effective casting operation time of the mold 100 can be increased, thereby improving the productivity of the casting.

Further, it is possible to uniformly cool the projecting portion 122 to suppress or prevent the temperature deviation from being generated depending on the position. Thus, the quality of the cast steel produced by uniformly cooling the molten steel can be improved. Therefore, the defective occurrence rate is reduced and the productivity of the cast steel can be improved.

FIG. 7 is a flowchart showing a method of manufacturing a mold according to an embodiment of the present invention, and FIG. 8 is a view showing a temperature distribution of a short side member according to an embodiment of the present invention.

Referring to FIG. 7, a method of manufacturing a mold according to an exemplary embodiment of the present invention includes a step (S100) of providing a short side member having a long side member and a protrusion, a process of forming a first through hole from one side of the short side member S200), and forming a second through hole having a slope different from that of the first through hole (S300) from the other side opposite to the one side of the short side member. At this time, the mold may be a tread mold having a curvature. In addition, the process of forming the first through hole and the process of forming the second through hole may be sequentially performed, concurrently or in reverse order.

3 to 6, a pair of long side members 110 spaced from each other in one direction and a pair of short side members 120 spaced from each other in a direction intersecting the one direction may be provided. Thus, a predetermined space in which molten steel can be received may be formed between the two long side members 110 and the two short side members 120. [ The short side member 120 may have a curvature.

The protrusions 122 may be provided on mutually facing surfaces of the short side members 120. A plurality of protrusions 122 may be provided and may be formed on both sides of the short side member 120, respectively. The short side member 120 may form a chamfered surface at the corner portion of the casting which solidifies in the mold 100. [

At this time, the long side member 110 and the short side member 120 may be made of a copper (Cu) alloy to which zirconium (Zr) or chromium (Cr) is added in a small amount. Such a copper alloy may have a lower hardness when the temperature rises to 350 ° C or higher. Therefore, the projections 122 of the mold 100, particularly the short side member 120, can be worn and broken by the casting material to be solidified. Accordingly, the first through-hole 141 and the second through-hole 142 through which the cooling water can move can be formed in the short side member 120 to lower the temperature of the protrusion 122 with the cooling water.

Before forming the first through hole 141 and the second through hole 142 in the short side member 120, the plane of the first through hole 141 and the second through hole 142, The position, the slope, and the diameter of the image can be calculated.

The position on the plane of at least one of the first through hole 141 and the second through hole 142 can be calculated from the upper surface or the lower surface of the short side member 120. [ The first through hole 141 and the second through hole 142 can be formed around the point by finding the point where the two lines meet on the plane by using the above-described equations (1) and (2) have.

Also, the inclination angle of at least one of the first through-hole 141 and the second through-hole 142 can be calculated. That is, the tilted angle of at least one of the first through-hole 141 and the second through-hole 142 inclined in a direction in which the through-hole 140 is formed in a refracted shape can be calculated. The angle of inclination in the thickness direction is calculated using the equation (3) described above and the angle of the first through hole 141 (141) is calculated along the angle calculated from the upper surface or the lower surface of the short side member 120 to the inside of the short side member 120 ) Or the second through-hole 142 can be formed.

In addition, the diameter of at least one of the first through-hole 141 and the second through-hole 142 can be calculated using the above-described equation (4). Accordingly, the first through-hole 141 and the second through-hole 142 can be formed according to the calculated diameter.

Since the short side member 120 is made of an alloy, it is difficult to form the through hole 140 in the short side member 120 so as to have a curvature. Accordingly, the first through-hole 141 and the second through-hole 142, which are inclined in different directions, can be formed in a straight line.

The first through hole 141 may extend from the upper surface 120a of the short side member toward the inside of the short side member 120. [ The second through hole 142 may extend from the lower surface 120b of the short side member toward the inside of the short side member 120. [ Accordingly, the first through-hole 141 and the second through-hole 142, which are formed in a straight line, can be connected at the middle portion of the length of the short side member 120. Accordingly, the through hole 140 can be refracted along the curved shape of the short side member 120 to uniformly cool the protrusion 122.

For example, it is possible to compare the case of forming a straight through-hole and the case of forming at least a part of the through-hole refracted. Referring to FIG. 8 (a), if the protruding portion 122 having a curvature and the through-hole extending straight in a longitudinal direction are provided, a large difference in the temperature of the protruding portion 122 may occur depending on the height. That is, although the protrusion 122 has a curvature, the through hole is formed only in a straight line, and the distance between the end of the protrusion 122 and the through hole differs according to the height, Cooled, distant parts may not cool. Accordingly, the upper and lower portions of the protrusion 122, which are relatively far from the through-hole, may not be cooled.

In particular, since the upper portion of the protruding portion 122 is the portion that is first in contact with the high-temperature molten steel, the temperature can be increased more than the other portions. Therefore, when the casting process is performed, the temperature of the upper portion of the protruding portion 122 rises to 350 DEG C or more, the hardness becomes weak, and it can be easily broken.

On the other hand, when the protrusion 122 having a curvature and the through-hole 140 at least a portion of which is refracted are provided according to the embodiment of the present invention as shown in FIG. 8B, the temperature of the protrusion 122 Can be suppressed or prevented. That is, since the shape of the through hole 140 is refracted corresponding to the shape of the protrusion 122, the distance between the end of the protrusion 122 and the distance between the through hole 140 and the protrusion 122 can be made uniform. Thus, the upper portion, the middle portion, and the lower portion of the protruding portion 122 can be uniformly cooled. Particularly, it is possible to prevent the temperature from rising above 350 DEG C at which the upper portion of the protruding portion 122 becomes fragile. Therefore, the durability of the protruding portion 122 is not deteriorated, so that breakage can be suppressed or prevented, temperature deviation can be prevented from occurring in the protruding portion 122, and the molten steel can be solidified at a uniform temperature.

The cooling water moving in the first through hole 141 and the second through hole 142 of the mold 100 can uniformly cool the protruding portion 122. Therefore, the temperature of the protruding portion 122 rises and it is possible to suppress or prevent the abrasion due to the coagulated cast steel. Therefore, the durability of the protrusion 122 can be improved, the life of the mold 100 can be improved, and the effective casting operation time of the mold 100 can be increased, thereby improving the productivity of the casting.

Further, it is possible to uniformly cool the projecting portion 122 to suppress or prevent the temperature deviation from being generated depending on the position. Thus, the quality of the cast steel produced by uniformly cooling the molten steel can be improved. Therefore, the defective occurrence rate is reduced and the productivity of the cast steel can be improved.

Although the present invention has been described in detail with reference to the specific embodiments thereof, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the scope of the present invention. Therefore, the scope of the present invention should not be limited by the described embodiments, but should be defined by the appended claims, as well as the appended claims.

10: Tundish 20: Cooling stand
30: cutter 100: mold
110: Long side member 120: Short side member
121: body portion 122:
141: first through hole 142: second through hole

Claims (17)

As a mold for producing a cast slab,
A pair of long side members spaced apart from each other in one direction;
A pair of short side members provided between the long side members and spaced apart from each other in a direction intersecting the one direction; And
And a through hole formed in the short side member and at least a part of which is bent,
Wherein the short side member includes a body portion and a plurality of protrusions protruding outward from the body portion,
The number of the through holes being equal to the number of the protrusions corresponding to the positions of the protrusions so that the plurality of protrusions can be cooled,
Wherein the distance between the through hole and the end of the protrusion in the upper region of the short side member is smaller than the distance between the through hole and the end of the protrusion in the middle region. The method according to claim 1,
Wherein the body and the protrusion have a curvature in the longitudinal direction and the protrusion has a narrower width toward the end. The method of claim 2,
The through-
A first through hole extending inward from an upper surface of the short side member and inclined with respect to a longitudinal direction of the body portion; And
And a second through hole extending inwardly from a lower surface of the short side member and tilted in a different direction with respect to the longitudinal direction of the first through hole and the first through hole. The method of claim 3,
Wherein the first through-hole and the second through-hole extend in a straight line,
And the first through-hole and the second through-hole are connected at a middle portion of the length of the short side member. delete The method of claim 3,
The upper and lower surfaces of the protrusions,
A first side projecting in the thickness direction in the body portion; And
And a second side connecting the first side and the body part. The method of claim 2,
And a pair of the protrusions are connected to both sides of the body part. The method of claim 6,
And at least one of the vertical distance (L1) from the second side to the center of the first and second through holes is calculated by the following formula (1).
(1): L1 = A 占 cos (?) 占 sin (?)
(Where A is the length of the second side and? Is the angle between the first side and the second side of the body). The method of claim 6 or claim 8,
And at least one of a vertical distance (L2) from a side surface of the short side member to a center portion of the first and second through holes is calculated by the following formula (2).
(2): L2 = 1/3 占 A 占 cos (?)
(Where A is the length of the second side and? Is the angle between the first side and the second side of the body). The method of claim 6 or claim 8,
Wherein at least one of an angle (alpha) at which the first and second through holes are inclined with respect to the longitudinal direction is calculated by the following formula (3).
Equation (3):? = 1/2 × Z / R × 180 /
(Where Z is the length of the short side member in the vertical direction and R is the radius of curvature of the short side member) The method of claim 6 or claim 8,
And at least one of the diameters (D) of the first and second through-holes is calculated by the following formula (4).
(4): D = 2/3 x A x cos (?) - 11
(Where A is the length of the second side and? Is the angle between the first side and the second side of the body). A step of providing a short side member having a long side member and a plurality of projections;
Forming a first through hole from one side of the short side member; And
And forming a second through hole having a slope different from that of the first through hole from the other surface opposite to the one surface of the short side member,
Wherein the step of forming the through holes includes forming the through holes in a number corresponding to the number of protrusions corresponding to the protrusions so as to cool the plurality of protrusions,
Wherein the distance between the through hole and the end of the protrusion in the upper region of the short side member is shorter than the distance between the through hole and the protrusion in the intermediate region. The method of claim 12,
Before forming the first through holes and the second through holes,
And calculating a position of the first through hole and the second through hole. 14. The method of claim 13,
Wherein the step of calculating the positions of the first through holes and the second through holes comprises:
Calculating a position on a plane of at least one of the first through hole and the second through hole on an upper surface or a lower surface of the short side member; And
And calculating a tilt angle of at least one of the first through-hole and the second through-hole. The method according to claim 13 or 14,
Calculating positions of the first through holes and the second through holes,
And calculating a diameter of at least one of the first through holes and the second through holes. The method of claim 12,
Wherein the short side member has a curvature,
The process of forming the first through hole and the second through hole includes:
Forming the first through hole and the second through hole in a longitudinal direction; And
And connecting the first through hole and the second through hole at an intermediate portion of a length of the short side member. The method according to any one of claims 12 to 14,
Wherein the mold comprises a full bending mold, and the material of the mold comprises copper.

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