JP4568013B2 - Continuous casting mold - Google Patents

Description

  The present invention relates to a continuous casting mold containing an electromagnetic stirring device for stirring molten steel in a mold.

  Conventionally, a method of electromagnetically stirring molten steel in a mold in order to obtain slabs with excellent surface quality by actively levitating and removing non-metallic inclusions or gas contained in molten steel injected into a continuous casting mold Is known, and a mold for doing so is disclosed in US Pat.

  In the mold of Patent Document 1, a coil of an electromagnetic stirrer is provided in the upper part of the long side cooling box, and a cooling water supply header and a drainage header are provided in the lower part of the coil storage part. As a result, the electromagnetic stirring device can be arranged on the upper part of the mold, and the molten steel upper surface in the mold and the coil upper surface of the electromagnetic stirring device can be matched, so that the molten steel stirring becomes good and the slab having excellent surface quality is manufactured. Became possible.

  Further, in the mold of Patent Document 1, a copper plate is stretched over the entire surface of the molten steel side front plate of the cooling box, and the cooling effect is enhanced by passing cooling water through the copper plate, which is injected into the mold. The molten steel is cooled and solidified. Since this copper plate is always in contact with high-temperature molten steel, damage such as cracking or melting is likely to occur, and if damage occurs, it must be replaced with another copper plate.

  However, in the mold of Patent Document 1, the cooling box and the copper plate have an integral structure, and when replacing the copper plate, it is necessary to replace the cooling box integrally with the cooling box. There was a problem that it took time.

  On the other hand, in Patent Document 2, a spacer having a cooling groove for passing cooling water is detachably inserted between the cooling box and the copper plate so that the cooling groove is not provided on the copper plate. When exchanging the metal plate, a mold is disclosed in which the copper plate can be easily removed by removing the spacer.

  However, the mold of Patent Document 2 has a problem that the electromagnetic stirring ability is lowered because the distance between the molten steel surface and the electromagnetic stirring device is increased by interposing a spacer.

  Therefore, the applicant of the present application has proposed a continuous casting mold in Japanese Patent Application No. 2003-205251 in which the copper plate can be easily replaced without lowering the electromagnetic stirring ability.

  FIG. 5 is a cross-sectional view showing a continuous casting mold proposed by the present applicant in Japanese Patent Application No. 2003-205251. In the figure, a front plate 2 is welded and fixed to the molten steel M side of the cooling box 1, and a copper plate fixing plate 3 is detachably attached to the front plate 2 by a plurality of copper plate fixing plate mounting bolts 4, A copper plate 5 is fixed to the copper plate fixing plate 3. The cooling water supply header 6 and the drainage header 7 are provided in the lower part of the cooling box 1, and the cooling water is supplied from the water supply header 6 through the water supply hole 3 a of the copper plate fixing plate 3 to the cooling groove 5 a of the copper plate 5. And is discharged to the drainage header 7 via the drainage hole 3 b of the copper plate fixing plate 3.

  In addition, an electromagnetic stirring device 8 is accommodated in the cooling box 1, and an opening 2a is provided in the front plate 2 so that the front surface of the coil 8a approaches the molten steel M. The opening 2a is provided with the coil 8a. The front is inserted. The rear side of the cooling box 1 (the side opposite to the molten steel M) is also open, and an electromagnetic stirring device 8 is fixed to the opening end by a bolt 12.

  As described above, in the continuous casting mold of FIG. 5, the distance between the coil 8a and the molten steel M can be reduced because the front surface of the coil 8a is inserted through the opening 2a provided in the front plate 2. Sufficient electromagnetic stirring ability can be secured. Moreover, since the copper plate fixing plate 3 to which the copper plate 5 is fixed is detachably attached to the front plate 2, only the copper plate 5 and the copper plate fixing plate 3 can be easily exchanged.

However, in the continuous casting mold shown in FIG. 5, since both the water supply header 6 and the drainage header 7 are provided at the lower part of the cooling box 1, the copper plate fixing plate mounting bolt 4 is attached to the cooling box from the necessity of sealing the cooling water. It is necessary to provide the upper and lower two stages in the lower part. Then, as shown in FIG. 6, the copper plate fixing plate mounting bolt 4 becomes a node, and local deformation occurs in the copper plate 5 particularly at the portion corresponding to the drainage header 7, and thermal fatigue cracking of the copper plate 5 is likely to occur. There was a problem.
Japanese Utility Model Publication No. 58-49172 Japanese Patent Laid-Open No. 9-262642

  The problem to be solved by the present invention is to provide a continuous casting mold capable of easily replacing a copper plate and eliminating local deformation of the copper plate.

The present invention accommodates an electromagnetic stirrer in a cooling box, a front plate is welded and fixed to the molten steel side of the cooling box, and a copper plate fixing plate is detachably attached to the front plate by a copper plate fixing plate mounting bolt . In the continuous casting mold in which a copper plate is attached to the copper plate fixing plate, a water supply header for supplying cooling water to the copper plate fixing plate and the copper plate is provided at a lower portion of the cooling box, and a drainage header for draining the cooling water after supplying water is provided. Provided on both sides of the cooling box, the copper plate fixing plate mounting bolts are provided only around the copper plate fixing plate .

In the above configuration, the copper plate fixing plate is provided with a water supply hole for supplying water to the cooling water from the water supply header to the copper plate, and a drain hole for draining the cooling water is drained from the copper plate to the drain header, the The drain hole may be bent at a right angle toward both sides of the copper plate fixing plate .

  According to the present invention, since the copper plate fixing plate to which the copper plate is attached is detachably attached to the molten steel side of the cooling box, only the copper plate and the copper plate fixing plate can be easily exchanged.

  Furthermore, since the drainage headers are provided on both sides of the cooling box, not on the lower part of the cooling box, the drainage of the copper plate fixing plate mounting bolts conventionally provided in the upper and lower two stages of the water supply bedder part and the drainage header part at the lower part of the cooling box. The copper plate fixing plate mounting bolt in the header can be omitted, and the copper plate fixing plate mounting bolt only needs to be provided around the copper plate fixing plate, so that local deformation of the copper plate can be eliminated and the life of the copper plate can be extended. it can.

  Embodiments of the present invention will be described below based on examples shown in the drawings.

  1 is a cross-sectional view showing a continuous casting mold according to the present invention, FIG. 2 is a view taken along the line AA in FIG. 1, and FIG. 3 is a view taken along the line BB in FIG.

  As shown in FIG. 1, a front plate 2 is welded and fixed to the molten steel M side of the cooling box 1, and a copper plate fixing plate 3 is detachably attached to the front plate 2 by a plurality of copper plate fixing plate mounting bolts 4. The copper plate 5 is fixedly attached to the copper plate fixing plate 3.

  In addition, an electromagnetic stirring device 8 is accommodated in the cooling box 1, and an opening 2a is provided in the front plate 2 so that the front surface of the coil 8a approaches the molten steel M. The opening 2a is provided with the coil 8a. The front is inserted. The rear side of the cooling box 1 (the side opposite to the molten steel M) is also open, and an electromagnetic stirring device 8 is fixed to the opening end by a bolt 9. In the present embodiment, the concave portion 3c is formed in the copper plate fixing plate 3, and the front surface of the coil 8a is made to approach the molten steel M.

  Although the rigidity of the cooling box 1 is reduced by providing the opening 2a in the front plate 2, in this embodiment, the convex portion 2b is provided in the front plate 2 and the concave portion 3d is provided in the copper plate fixing plate 3 so as to be uneven. By fitting, the rigidity of the cooling box 1 is maintained. Moreover, the thickness of the front plate 2 and the copper plate fixing plate 3 can be reduced by fitting the front plate 2 and the copper plate fixing plate 3 in a concave-convex manner, and the front surface of the coil 8a of the electromagnetic stirrer 8 is molten steel M. Can be approached.

  In addition, when it is not necessary to make the front surface of the coil 8a of the electromagnetic stirrer 8 approach the molten steel M, it is not necessary to provide the opening 2a in the front plate 2 or the recess 3c in the copper plate fixing plate 3. However, the front plate 2 and the copper plate fixing plate 3 do not have to be unevenly fitted.

  The cooling water supply header 6 is provided in the lower part of the cooling box 1, and the cooling water flows from the water supply header 6 into the cooling groove 5 a of the copper plate 5 through the water supply hole 3 a of the copper plate fixing plate 3. Cooling water from the cooling groove 5 a of the copper plate 5 is drained into the drain hole 3 b of the copper plate fixing plate 3. The drain holes 3b are bent at right angles toward both sides of the copper plate fixing plate 3 as shown in FIG. 2, and the cooling water from the drain holes 3b is fed to both sides of the cooling box 1 as shown in FIG. The drainage header 7 is drained and finally drained from the drainage port 10. Note that water supply ports 11 for supplying cooling water to the water supply header 6 are also provided on both sides of the cooling box 1.

  As described above, in the present invention, since the drainage headers 7 are provided on both sides of the cooling box 1, the copper plate fixing plate mounting bolts 4 are simply provided around the copper plate fixing plate 3 as shown in FIGS. The sealing property of cooling water can be secured. Therefore, the deformation of the copper plate 5 becomes gentle and uniform as shown in FIG. 4, and no local deformation occurs.

It is sectional drawing which shows the casting_mold | template for continuous casting of this invention. It is an AA arrow directional view of FIG. It is a BB line arrow directional view of FIG. It is a schematic diagram which shows the deformation | transformation of the copper plate in the casting mold for continuous casting of this invention. It is sectional drawing which shows the conventional casting mold. It is a schematic diagram which shows the deformation | transformation of the copper plate in the conventional casting mold for continuous casting.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Cooling box 2 Front plate 2a Opening 2b Protruding part 3 Copper plate fixing plate 3a Water supply hole 3b Drain hole 3c, 3d Recessed part 4 Copper plate fixing plate mounting bolt 5 Copper plate 5a Cooling groove 6 Water supply header 7 Drainage header 8 Electromagnetic stirring device 8a Coil 9 Bolt 10 Drainage port 11 Water supply port 12 Bolt M Molten steel

Claims (2)

An electromagnetic stirrer is housed in the cooling box, a front plate is welded and fixed to the molten steel side of the cooling box, and a copper plate fixing plate is detachably attached to the front plate by a copper plate fixing plate mounting bolt , the copper plate fixing plate In the continuous casting mold with a copper plate attached to the copper plate, the copper plate fixing plate and the copper plate are provided with a water supply header for supplying cooling water to the lower part of the cooling box, and drainage headers for draining the cooling water after water supply are provided on both sides of the cooling box. A continuous casting mold characterized in that the copper plate fixing plate mounting bolts are provided only on the periphery of the copper plate fixing plate . The copper plate fixed plate, a water supply hole for supplying water to the cooling water from the water supply header to the copper plate, and a drain hole for draining the cooling water is drained from the copper plate to the drainage header provided, wherein the drainage hole is the copper plate The continuous casting mold according to claim 1, wherein the casting mold is bent at right angles toward both sides of the fixed plate .

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