JP2009056489A - Method for repairing continuous casting mold, and repaired continuous casting mold - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for repairing a continuous casting mold, which method can suppress the increase of the cooling efficiency of the casting mold caused by the repairing, and can stably manufacture a cast ingot having excellent quality while suppressing break-out of the cast ingot due to the super-cooling, and further to provide a repaired continuous casting mold. <P>SOLUTION: The continuous casting mold has a pair of short sides arranged so as to be opposed to each other at an interval, a pair of long sides 10, 11 arranged so as to be opposed to each other in such a state that the short sides are sandwiched from both sides in the axial direction, and supporting members 13, 14 fixed to the back sides of the short sides and the long sides 10, 11 by means of a plurality of fastening means 12 respectively. In the method for repairing the continuous casting mold, when the front surface side of the cooling members composing the short sides and the long sides 10, 11 have been damaged by being used, a thermal resistance layer 21 composed of the metal having a thermal conductivity lower than that of the cooling member is formed on the back side surface of the damaged cooling member or both of the front side surface and the back side surface. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

The present invention relates to a method for repairing a continuous casting mold used for producing a slab and a repaired continuous casting mold.

Conventionally, molten steel is supplied to a continuous casting mold (hereinafter, also simply referred to as a mold) 80 shown in FIGS. 5 and 6A to 6C to cast a slab. The mold 80 is opposed to a pair of short sides (also referred to as short pieces) 81 and 82 made of copper plates opposed to each other with a gap therebetween, with the short sides 81 and 82 being sandwiched from both sides in the width direction. And a pair of long sides (also referred to as long pieces) 83 and 84 formed of copper plates arranged.
The short sides 81 and 82 are mirror-symmetrical and have the same configuration, and a large number of water guide grooves 85 to 87 are provided in the vertical direction on the back side. The back side of the short sides 81 and 82 is backed by bolts 88. Plates 89 and 90 (also called support members, cooling boxes, or water boxes) are fixed. The long sides 83 and 84 are also provided with a large number of water guide grooves 85 to 87 in the vertical direction on the back side, and the back plates 91 and 92 are fixed to the back side of the long sides 83 and 84 by bolts 88. (For example, refer to Patent Document 1).

The mold 80 is configured to include short sides 81 and 82, long sides 83 and 84, and respective back plates 89 to 92, and the back plates 91 and 92 fixed to the long sides 83 and 84 that are opposed to each other. Bolts 93 are attached to both ends, and are fixed with nuts 94 via springs (not shown).
At the time of continuous casting work, from the water supply part (not shown) provided in the lower part of the back plates 89 to 92, the short sides 81 and 82 and the long sides 83 and 84 are provided via a large number of water guide grooves 85 to 87. Then, cooling water is allowed to flow to a drainage section (not shown) provided on the upper portions of the back plates 89 to 92. As a result, while cooling the short sides 81 and 82 and the long sides 83 and 84, the molten steel is poured from above the mold 80 to perform the initial solidification of the molten steel, and the slab formed with the solidified shell is almost removed from below the mold. Drawing continuously at a constant speed to produce a slab.
In this way, when the slab is manufactured, if damage occurs on the surface side (molten steel contact surface side) of each of the short sides 81 and 82 and each of the long sides 83 and 84, the surface side is modified (ground). (Also called) and repair work to be removed. By performing this repair work a plurality of times, the same mold can be used repeatedly.

JP 2003-136204 A

However, as the surface side of each of the short sides 81 and 82 or the long sides 83 and 84 is repaired, the thickness becomes thinner than the thickness at the start of use and the thermal resistance is lowered. There was a problem.
The thermal resistance of each of the short sides 81 and 82 and each of the long sides 83 and 84 is lower than that at the start of use, thereby lowering the surface temperature (for example, from 300 ° C. to 240 ° C.) and forming a solidified shell. The cooling efficiency of the cast slab is increased and the amount of shrinkage is increased. For this reason, the gap (gap) generated between the surface of each short side 81, 82 and each long side 83, 84 and the slab surface becomes large, and this gap is concentrated at the corner of the mold by the molten steel static pressure. The solidification delay of the slab at the corner increases.
As a result, the quality of the slab at the corner of the mold tends to deteriorate each time refurbishment, and the solidified shell of the slab located at the corner of the mold becomes thin and is easily broken by thermal stress. There was a possibility that a breakout occurred in which the solidified shell was broken at the lower end of the mold and the molten steel was ejected to the outside.

The present invention has been made in view of such circumstances, and it is possible to suppress an increase in cooling efficiency of a mold accompanying repair, and stably manufacture a slab having good quality while suppressing breakout of the slab due to overcooling. It is an object of the present invention to provide a method for repairing a continuous casting mold and a repaired continuous casting mold.

In the repair method for a continuous casting mold according to the first invention that meets the above-described object, a pair of short sides that are opposed to each other with a gap therebetween, and the short sides that are sandwiched from both sides in the width direction are arranged to face each other. It has a pair of long sides and a supporting member fixed by a plurality of fastening means on the short side and the back side of the long side, respectively, and the surface side of the cooling member constituting the short side or the long side by use is In repairing damaged molds for continuous casting,
A heat resistance layer made of a metal having a thermal conductivity smaller than that of the cooling member is formed on the back surface side of the damaged cooling member or on both the front surface side and the back surface side.

In the repair method for a continuous casting mold according to the second aspect of the present invention, the pair of short sides arranged to face each other with a gap therebetween, and the short sides are arranged to face each other with the short sides sandwiched from both sides in the width direction. It has a pair of long sides and a supporting member fixed by a plurality of fastening means on the short side and the back side of the long side, respectively, and the surface side of the cooling member constituting the short side or the long side by use is In repairing damaged molds for continuous casting,
When a damaged surface of the cooling member is formed with a heat resistance layer made of a metal having a lower thermal conductivity than the cooling member, and the thickness of the heat resistance layer is repaired Is set according to the grinding thickness of the cooling member.

In the method for repairing a continuous casting mold according to the first invention, it is preferable that the thickness of the thermal resistance layer is set in accordance with a grinding thickness of the cooling member to be performed when repairing the damaged cooling member.
In the method for repairing a continuous casting mold according to the first invention, the thermal resistance layer is formed on a surface on the back side of the damaged cooling member, and the water guide groove provided in the cooling member has an inner width W. 8 mm or more and 300 mm or less, depth D is 3 mm or more and 20 mm or less, and the ratio D / W of depth D to inner width W satisfies the relationship of 0.01 or more and 2.5 or less, and is formed wide. Preferably it is.

In the method for repairing a continuous casting mold according to the first invention, the thermal resistance layer is formed on a surface on the back side of the damaged cooling member, and the water guide groove provided on the cooling member is a back surface of the cooling member. And a spacer provided with a partition portion that protrudes toward the back surface side of the cooling member and that has a front end surface that abuts against a bottom surface that forms the space portion of the cooling member. It is preferable.
In the method for repairing a continuous casting mold according to the first and second inventions, the thermal resistance layer is preferably formed by plating or thermal spraying.
In the method for repairing a continuous casting mold according to the first and second inventions, the metal constituting the thermal resistance layer is preferably Ni or an alloy containing Ni.

The repaired continuous casting mold according to the third aspect of the invention that meets the above object is repaired by using the method for repairing the continuous casting mold according to the first and second aspects of the invention.

The method for repairing a continuous casting mold according to claim 1 and claims 3 to 7 dependent thereon, and the repaired continuous casting mold according to claim 8 include a back surface or a surface of a damaged cooling member. Since a heat resistance layer composed of a metal having a lower thermal conductivity than the cooling member is formed on both the side and the back surface, grinding the cooling member for repair, even when its thickness is reduced, The molten steel can be cooled under the same cooling conditions as before the repair. Thereby, the slab provided with good quality can be stably manufactured while suppressing breakout of the slab due to overcooling.

The method for repairing a continuous casting mold according to claim 2 and claims 6 and 7 dependent thereon, and the repaired continuous casting mold according to claim 8 are cooled on the surface of the damaged cooling member on the surface side. Since a heat resistance layer made of a metal with lower thermal conductivity than the member is formed, even if the cooling member is ground for repair and its thickness is reduced, the molten steel is used under the same cooling conditions as before repair. Can be cooled. And since the thickness of a thermal resistance layer is set according to the grinding thickness of the cooling member at the time of repair, whenever it repairs, the thermal resistance of a cooling member can be restored to an unused state.
Thereby, the slab provided with good quality can be stably manufactured while suppressing breakout of the slab due to overcooling.

In particular, in the method for repairing a continuous casting mold according to claim 3, since the thickness of the heat resistance layer is set according to the grinding thickness of the cooling member at the time of repairing, each time repair is performed, The thermal resistance can be restored to an unused state.
The method for repairing a continuous casting mold according to claim 4, wherein the heat resistance layer is formed on the surface on the back surface side having a temperature lower than that on the surface side of the cooling member. Damage caused by cracks can be avoided. Moreover, since the width of the water guide groove is formed wide within a predetermined range, for example, the workability and workability of plating or thermal spraying can be improved.

6. The method for repairing a continuous casting mold according to claim 5, wherein the water guide groove is formed by a space portion formed on the back surface side of the cooling member and a spacer provided with a partition portion contacting the bottom surface forming the space portion. Therefore, it is not necessary to process the support member, and the cost associated with the remodeling process can be reduced.
In the method for repairing the continuous casting mold according to claim 6, since the heat resistance layer is formed by plating or thermal spraying, the adhesion between the heat resistance layer and the cooling member can be improved.
In the method for repairing a continuous casting mold according to claim 7, since the metal constituting the heat resistance layer is Ni or an alloy containing Ni, the adhesion between the heat resistance layer and the cooling member can be further improved.

Next, embodiments of the present invention will be described with reference to the accompanying drawings for understanding of the present invention.
Here, FIG. 1 is an explanatory view of the back side of the long side of a continuous casting mold repaired by the method for repairing a continuous casting mold according to one embodiment of the present invention, and FIG. 2 (A) is a in FIG. -A arrow sectional view, (B) is a bb arrow sectional view of FIG. 1, (C) is a cc arrow sectional view of FIG. 1, and FIG. 3 is a dd arrow sectional view of FIG. It is.

As shown in FIGS. 1 to 3, continuous casting molds repaired by the continuous casting mold repair method according to one embodiment of the present invention (hereinafter also simply referred to as molds) are opposed to each other with a gap therebetween. A pair of unillustrated short sides (also referred to as short pieces), a pair of long sides (also referred to as long pieces) 10 and 11, which are opposed to each other with the short sides sandwiched from both sides in the width direction, short sides and long sides Support members fixed by fastening means groups each having a plurality of fastening means 12 arranged side by side in the vertical direction (casting direction) on the back surfaces (surfaces opposite to the surface in contact with the molten steel) of sides 10 and 11. A mold having back plates (also referred to as cooling boxes or water boxes) 13 and 14 as an example is repaired because it has been damaged by use. The mold is supplied from a water supply section (not shown) provided below the back plates 13 and 14 through a plurality of water guide grooves 15 and 16 provided on the back sides of the short sides and the long sides 10 and 11. Cooling water is supplied to the drainage part 17 provided in the upper part of 13 and 14, and the short side and long side 10 used as the cooling member are the molten steel supplied in the mold main body formed by the short side and long sides 10 and 11. The slab (an example of a cast slab) can be manufactured while being cooled and solidified at 11. The short side and the long sides 10 and 11 are different in only the width, and the other configurations are substantially the same. Further, since the long sides 10 and 11 are mirror-symmetrical, the long sides shown in FIGS. The configuration of the side 10 will be mainly described in detail.

In the mold before damage, each short side is made of copper (Cu) or a copper alloy (Cu alloy). For example, the thickness is about 5 mm to 100 mm, the width is about 50 mm to 300 mm, and the length in the vertical direction. Is about 600 mm or more and 1200 mm or less. Each of the long sides 10 and 11 is made of copper or a copper alloy. For example, the thickness is about 5 mm to 100 mm, the width (the width in contact with the slab) is about 600 mm to 3000 mm, and the length in the vertical direction is The same as the short side.
Therefore, the distance between the pair of short sides arranged opposite to each other is about 600 mm to 3000 mm, the distance between the pair of long pieces 10 and 11 is about 50 mm to 300 mm, and the length in the vertical direction of the mold is , 600 mm or more and 1200 mm or less. In addition, the short side opposingly arranged can change the space | interval within the above-mentioned range.
Thereby, for example, a slab having a width of about 600 mm to about 3000 mm and a thickness of about 50 mm to about 300 mm can be manufactured.

The water guiding grooves 15 and 16 provided on the back side of the long side 10 are formed by the space 18 formed on the back side of the long side 10 and the back plate 13.
The space 18 formed in the long side 10 is formed by flattening the long side 10 so that the thickness T of the long side 10 in this portion is 5 mm or more and 60 mm or less.
On the other hand, the back plate 13 protrudes in the vertical direction of the long side 10 toward the back surface side of the long side 10, and a partition portion 19 whose front end surface abuts against a bottom surface forming the space portion 18 of the long side 10. , 20 are provided. A plurality of (two in the present embodiment) partition portions 19 and 20 are provided between the rows of fastening means groups adjacent in the width direction. The interval S between the fastening means groups adjacent in the width direction is, for example, about 50 mm to 200 mm.
Thereby, the water guide groove 16 is formed between the adjacent partition parts 19 and 20, and the water guide groove 15 is formed between the adjacent partition parts 20 and 19 around the fastening means group.

Of these partitions 19, 20, the partitions 19, 20 located at the side portions of the fastening means 12 are made narrower than the other parts, and the plane cross-sectional area of the water guide groove 15 having the fastening means 12 therebetween. However, the sectional shape of each partition may be the same. The water guide groove 16 has the same cross-sectional shape in the vertical direction of the long side 10.
Further, the partition plate is not provided on the back plate, and the back plate can be fixed to the long side via a spacer provided with the partition portion. In this case, on the back side of the long side, in the region connecting the fastening means adjacent to the top and bottom of the fastening means group, leaving a fixing portion protruding from the back side of the long side in the vertical direction of the long side. Forming part. And after fixing a spacer to a fixing | fixed part with a screw, a back plate is attached to the back surface side. The spacer may be made of, for example, copper, copper alloy, aluminum, aluminum alloy, iron, or stainless steel having corrosion resistance, and a plurality of spacers may be arranged in the width direction of the long side with the fastening means group as a boundary.

Each of the water guide grooves 15 and 16 has an inner width W1 and W2 of 8 mm to 300 mm, depths D1 and D2 of 3 mm to 20 mm, and a ratio D1 / W1 between the depth D1 and the inner width W1. The ratio D2 / W2 between the depth D2 and the inner width W2 satisfies the relationship of 0.01 or more and 2.5 or less.
For this reason, each of the water guide grooves 15 and 16 is formed wider than the inner width (about 5 mm) of the water guide groove shown in FIGS.

In the mold in which the surface side of the long side 10 is damaged and repaired, the heat resistance layer 21 is formed in the region on the back side of the long side 10 where the space 18 is formed. The thickness T1 of the heat resistance layer 21 is set according to the cutting thickness (also referred to as grinding thickness) of the long side 10 performed when repairing the long side 10.
Specifically, as shown in FIGS. 2A to 2C, the thermal conductivity of the metal constituting the thermal resistance layer 21 is λ1, the thickness is T1, and the thermal conductivity of the metal constituting the long side 10 is set. Is λ2 and the cut thickness is T2, the following relationship is established.
T1 / λ1 = (T2 / λ2) × α
Here, α is 0.9 or more and 1.1 or less. If it is in this numerical value range, there is no problem in use.

In addition, thickness T1 of the above-mentioned heat resistance layer 21 is performed within the range of 0.1 mm or more and 4 mm or less, for example.
In the present embodiment, the back surface side of the long side 10 in which the space 18 is formed (the bottom surface of the space 18) is engraved and processed by the same amount as the thickness T1 of the heat resistance layer 21 to be formed. The case of forming was shown. In this case, the engraved depth is also included in the cut thickness T2.
However, as long as the thickness of the heat resistance layer does not affect the flow of the cooling water, the heat resistance layer may be formed on the bottom surface of the space portion 18 without engraving the back side of the long side. .

The thermal resistance layer 21 is provided over the entire range from the position 50 mm above the meniscus to the position 300 mm below the meniscus. It may be provided entirely or partially. The meniscus position is in the range of 50 mm or more and 150 mm or less downward from the upper end of the long side 10.
The thermal resistance layer 21 has a thermal conductivity smaller than that of copper (thermal conductivity: 0.941 cal / cm / sec / ° C.) or a copper alloy constituting the long side 10 (for example, 0.3 cal / cm / sec / ° C. or less). , Preferably 0.1 cal / cm / sec / ° C. or less) and is made of a metal having a high thermal resistance. As this metal, it is preferable to use, for example, Ni (thermal conductivity: 0.16 cal / cm / sec / ° C.) or an alloy containing Ni. The alloy containing Ni is, for example, a Ni-Cu alloy, a Ni-Co alloy, a Ni-Co alloy, a Ni-Si-Cu alloy, a Ni-Mn alloy, a Ni-Fe alloy, a Ni-Cr alloy, Ni -Cr alloy, Ni-Cr-Fe alloy, Ni-Mo-Cr alloy, and Ni-Cr-Fe-Mo alloy.

On the back side of the long side 10 shown above (the side opposite to the cooling surface), a plurality of fastening means 12 are used, for example, a stainless steel back plate 13 (for example, a thickness of about 50 mm to about 500 mm) Is installed. At the time of this attachment, grooves (not shown) are formed in the periphery of the back plate 13 so as to surround the water supply portion of the back plate 13, the drainage portion 17, and the water guide grooves 15, 16 of the long side 10. By arranging the ring, the adhesion between the long side 10 and the back plate 13 is improved, and the leakage of the cooling water from the water guide grooves 15 and 16 is prevented. At this time, the front end surfaces of the partition portions 19 and 20 provided on the back plate 13 come into contact with the bottom surface forming the space portion 18, that is, the surface of the heat resistance layer 21.
The fastening means 12 has a female screw portion 22 formed on the long side 10 and a male screw (not shown) that is screwed into the female screw portion 22 to fasten the back plate 13. Further, in order to attach the male screw, a hole (not shown) formed in the back plate 13 is provided with a seal washer that can be waterproofed in advance, thereby preventing leakage of cooling water from the portion where the male screw is attached. .

In addition, a coating layer may be formed on the molten steel contact surface (the inner surface of the mold body) that is the surface of the long side 10 after removing the damaged portion.
For example, a Co alloy such as Co—Ni, a Ni alloy such as Ni—Fe, or Ni plating can be used for the coating layer, but thermal spraying (eg, Ni-based Cr—Si—B alloy) is also used. it can. This coating layer may be formed over the entire surface of the copper plate used for the long sides of the same type of component, and multiple types of components may be formed in different areas in the vertical direction of the copper plate. It may be formed according to each.
Each of the long sides shown above is manufactured by forming a coating layer on the surface of the copper plate and then performing a conventionally known machining process on a predetermined shape.
As for the shape of the long side, the distance between the pair of long sides may be the same in the drawing direction of the slab, but it is preferable that the long side is narrowed according to the solidification shrinkage shape of the slab.

Then, the repair method of the casting mold for continuous casting which concerns on one embodiment of this invention is demonstrated.
The continuous casting mold in an unused state is in a state in which the surface of each short side and each long side is not damaged, but by producing a cast piece, for example, on the surface side of the long side (molten steel contact surface side) Damage will occur.
Therefore, repair work for removing the damaged portion is performed by reworking (also called grinding) the surface side of the long side.
First, as shown in FIGS. 2A to 2C, the surface side of the long side 10 is cut by a predetermined thickness T2 (for example, about 1 to 3 mm per time) according to the depth of damage.
Next, the metal that forms the thermal resistance layer 21 and its thickness T1 are determined from the cut thickness T2 of the long side 10 and the thermal conductivity of copper constituting the long side 10. At this time, since the back side (the bottom surface of the space 18) of the long side 10 is engraved according to the thickness of the heat resistance layer 21 to be formed, this engraving depth is also included in the above-described cutting thickness T2.

Then, Ni or an alloy containing Ni, which is a metal constituting the heat resistance layer 21, is attached to the engraved bottom surface by plating or spraying, and the surface thereof (surface that becomes the bottom surface of the space portion 18) by machining. To smooth. In addition, a resist film made of a coating material (that is, a resist) is formed in advance on the surface of the female screw portion 22 (contact surface with the back plate 13) to prevent a heat resistance layer from being formed on the surface of the female screw portion 22. .
Thus, after forming the thermal resistance layer 21, the resist film is removed, the back plate 13 is attached, and the tip surfaces of the partition portions 19 and 20 are brought into contact with the surface of the thermal resistance layer 21 to be assembled into a mold shape. Then start casting work again.
By performing repair work, the same mold can be used repeatedly.

Next, the results of FEM analysis (analysis using the finite element method) for confirming the effects of the present invention will be described.
Here, the long side of the conventional example has the shape shown in FIG. 6, and by manufacturing the slab, damage has occurred on the surface side (molten steel contact surface side) of the long side. Repair work to be removed by grinding). Thus, the thickness of the surface side of the long side is reduced, so that the thickness is smaller than the thickness at the start of use (copper plate thickness at the start of use: 25 mm, thickness after the cut: 19 mm). In addition, the water guide groove formed in the copper plate has a depth of 13 mm and a width of 5 mm.
On the other hand, the long side of an Example is the shape shown in FIG.1, FIG.2 (A)-(C) and FIG. 3, and it is Ni on the back surface side of the copper plate which comprises the long side after an above-described cutting. A thermal resistance layer made of (thermal conductivity: 0.16 cal / cm / sec / ° C.) is formed. The heat resistance layer has a thickness T1 of 1.4 mm, and each water guide groove has an inner width W1 of 60 mm, a depth D1 of 5 mm, an inner width W2 of 20 mm, and a depth D2 of 5 mm. Furthermore, the ratio D1 / W1 between the depth D1 and the inner width W1 and the ratio D2 / W2 between the depth D2 and the inner width W2 are 0.08 and 0.25, respectively.

FIG. 4 shows a breakout occurrence rate index when the long sides of the above-described examples and comparative examples are used. In FIG. 4, the breakout occurrence rate index of the example is obtained with reference to 0.5, which is the breakout occurrence rate index when the long side of the conventional example is used.
As shown in FIG. 4, it was confirmed that by using the long side of the example, the occurrence index of breakout can be greatly reduced as compared with the case of using the long side of the comparative example. This is because the long side of the comparative example does not form a thermal resistance layer on the back side after refurbishing, so the thermal resistance of the long side is lower than at the start of use, and the surface temperature is reduced, This is due to the solidification delay caused by the generation and increase of the corner air gap due to the increased cooling efficiency of the slab formed with the solidified shell and the increased shrinkage.
From the above, by using the continuous casting mold repaired by the method for repairing the continuous casting mold of the present invention, it is possible to suppress an increase in the cooling efficiency of the mold accompanying the repair, and the slab breakout due to the overcooling It was confirmed that a slab having good quality could be stably produced while suppressing the above.

As described above, the present invention has been described with reference to the embodiment. However, the present invention is not limited to the configuration described in the above embodiment, and the matters described in the scope of claims. Other embodiments and modifications conceivable within the scope are also included. For example, a case where a repair method for a continuous casting mold of the present invention and a repaired continuous casting mold are configured by combining a part or all of the above-described embodiments and modifications is also included in the scope of the present invention. It is.
Moreover, in the said embodiment, although the long side and the short side were used as the cooling member, it is good also considering only a short side or only a long side as a cooling member.

In the present embodiment, the case where the thermal resistance layer is formed only on the back side of the long side has been described. However, it may be formed only on the front side of the long side, and further, the back side and the surface of the long side. It may be formed on both sides. When forming the thermal resistance layer on the surface side of the long side, after performing cutting work on the surface side of the long side for repair, forming a thermal resistance layer on the surface and performing machining, further heat The aforementioned coating layer is formed on the surface of the resistance layer.
Furthermore, in the above embodiment, the configuration of the mold for producing a slab, which is an example of a slab, has been described. However, the present invention is applied to other slabs having different shapes and dimensions, for example, a mold for producing a bloom. Of course, it is also possible.

It is explanatory drawing of the back side of the long side of the casting mold for continuous casting repaired with the repair method of the casting mold for continuous casting which concerns on one embodiment of this invention. 1A is a cross-sectional view taken along the line aa in FIG. 1, FIG. 1B is a cross-sectional view taken along the line bb in FIG. 1, and FIG. FIG. 2 is a cross-sectional view taken along the line dd in FIG. 1. It is explanatory drawing which shows the incidence rate of a breakout. It is a top view of the casting mold for continuous casting which concerns on a prior art example. (A) is explanatory drawing of the back side of the long side of the casting mold for continuous casting, (B) is a sectional view taken along arrow ee of (A), and (C) is a sectional view taken along arrow ff of (A). It is.

Explanation of symbols

10, 11: Long side, 12: Fastening means, 13, 14: Back plate (support member), 15, 16: Water guide groove, 17: Drain part, 18: Space part, 19, 20: Partition part, 21: Heat Resistance layer, 22: female thread

Claims (8)

A pair of short sides arranged opposite to each other with a gap, a pair of long sides arranged opposite to each other with the short sides sandwiched from both sides in the width direction, and a plurality of short sides and a plurality of back sides of the long sides In a method for repairing a continuous casting mold having a support member fixed by a fastening means, and the surface side of the cooling member constituting the short side or the long side is damaged by use,
Continuous casting characterized by forming a heat resistance layer made of a metal having a lower thermal conductivity than that of the cooling member on the back side surface of the damaged cooling member, or both the front side and the back side. Mold repair method. A pair of short sides arranged opposite to each other with a gap, a pair of long sides arranged opposite to each other with the short sides sandwiched from both sides in the width direction, and a plurality of short sides and a plurality of back sides of the long sides In a method for repairing a continuous casting mold having a support member fixed by a fastening means, and the surface side of the cooling member constituting the short side or the long side is damaged by use,
When a damaged surface of the cooling member is formed with a heat resistance layer made of a metal having a lower thermal conductivity than the cooling member, and the thickness of the heat resistance layer is repaired A method for repairing a casting mold for continuous casting, which is set according to the grinding thickness of the cooling member. 2. The method of repairing a continuous casting mold according to claim 1, wherein the thickness of the thermal resistance layer is set according to a grinding thickness of the cooling member that is performed when repairing the damaged cooling member. Repair method for continuous casting mold. 4. The method for repairing a continuous casting mold according to claim 1, wherein the heat resistance layer is formed on a surface on the back side of the damaged cooling member, and is provided on the cooling member. 5. Satisfies the relationship that the inner width W is 8 mm or more and 300 mm or less, the depth D is 3 mm or more and 20 mm or less, and the ratio D / W between the depth D and the inner width W is 0.01 or more and 2.5 or less. A method for repairing a casting mold for continuous casting, characterized in that it is formed wide. 4. The method for repairing a continuous casting mold according to claim 1, wherein the heat resistance layer is formed on a surface on the back side of the damaged cooling member, and is provided on the cooling member. 5. Are provided with a space portion formed on the back surface side of the cooling member, and a partition portion projecting toward the back surface side of the cooling member, the tip surface of which contacts the bottom surface forming the space portion of the cooling member. A method for repairing a casting mold for continuous casting, characterized in that the casting mold is formed with a spacer. The method for repairing a continuous casting mold according to any one of claims 1 to 5, wherein the thermal resistance layer is formed by plating or spraying. The method for repairing a continuous casting mold according to any one of claims 1 to 6, wherein the metal constituting the thermal resistance layer is Ni or an alloy containing Ni. Repair method. A casting mold for continuous casting, which is repaired by using the method for repairing a casting mold for continuous casting according to any one of claims 1 to 7.

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