JPH06218497A - Mold for continuous casting - Google Patents

Abstract

PURPOSE:To stably draw a uniform cast slab without deforming the cast slab by arranging through holes of short size between graphite molds and water cooling jackets at both sides of the mold corresponding to both sides in the width direction of the cast slab. CONSTITUTION:Molten metal 2 is supplied from one side of the mold 3 and cooled in the mold 3. At the time of continuously drawing the cast slab 7 from the other end, the molten metal 2 introduced in the inner part of the mold is cooled from four directions of the upper and the lower surfaces and the side surfaces in the mold 3 and the parts corresponding to both ends in the width direction of the cast slab 7 are solidified more quickly. Then, when the solidification progresses in some degree, the cast slab 7 is separated from the mold 3 by solidified shrinkage and as the air gap is formed, the cast slab 7 at the end parts in the width direction are cooked through the air gap. However, in the mold for continuous casting, as the through-holes 9 are arranged at both end parts of the mold 3 corresponding to both ends in the width direction of the cast slab 7 between the graphite mold 4 and the water jacket 5, the heat conducting quantity in the width direction of the cast slab 7 is uniformized, and the cast slab 7 can uniformly be drawn without deforming.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a mold used in a continuous casting method in which a slab of a metal or an alloy, particularly a copper base alloy is horizontally drawn.

[0002]

2. Description of the Related Art In the continuous casting method, a molten metal is supplied from one of the molds by using a cooling mold having a through hole, the molten metal is solidified in the mold, and a slab is continuously drawn from the other end. The method is widely used in the production of steel and non-ferrous metals as a horizontal type, vertical type or curved type continuous casting method depending on the method of drawing out the slab.

In the horizontal continuous casting, the molten metal 2 in the holding furnace 1 is introduced into a mold 3 attached to the lower side wall of the holding furnace 1 as shown in FIG. Is a casting method for obtaining a cast slab 7 by removing heat from the mold 3. The mold 3 used at this time is further composed of a mold body 4, a water cooling jacket 5 and a mold outer frame 6, and the mold body 4 is made of a copper alloy or graphite having excellent thermal conductivity and heat resistance. In particular, the mold using graphite has excellent lubricity in addition to the characteristics that there is no slab defect due to slab surface cracking, oxide inclusion on the slab surface during continuous casting of copper and copper alloys. Because it is widely used.

In continuous casting using a mold as described above, the molten metal introduced into the mold is cooled and solidified from four directions of the upper and lower surfaces and side surfaces of the mold. When the solidification progresses to a certain extent, the slab separates from the mold due to the solidification shrinkage, forming a so-called air gap, and the slab is further cooled through the air gap to complete the solidification.

In this case, the solidification of the molten metal in the mold is the fastest due to the structure of the mold, that is, the parts that receive cooling from the three directions of the upper and lower surfaces and the side surfaces of the mold, that is, the ends in the width direction of the mold, and the reverse It becomes the slowest in the widthwise central part of the mold.

[0006]

Therefore, when casting a metal or an alloy using the above-mentioned mold, the amount of heat removed is not uniform in the width direction of the mold, and therefore the amount of heat removed may vary depending on the size and shape of the slab. Due to the uniformity, there is a problem that the amount of solidification shrinkage at each position in the width direction of the slab is different, which causes deformation of the slab. Moreover, if the slab is severely deformed, the slab will damage the inner surface of the mold.

Therefore, the present inventor has investigated the temperature distribution in the width direction of the slab when casting metals and alloys by the continuous casting method, that is, the relationship between the distribution in the width direction of the heat removal amount to the mold and the deformation of the slab. investigated. As a result, they have found that by suppressing the heat removal amount of the end portion in the width direction of the mold and making the heat removal amount in the width direction of the slab uniform, the slab can be cast without deformation.

The present invention has been made in view of the above circumstances, and when casting a metal or an alloy by a continuous casting method, it is possible to stably pull out a uniform slab without deforming the slab. It is an object to provide a mold for continuous casting of metals and alloys.

[0009]

In order to achieve the above-mentioned object, the present invention is a casting capable of suppressing heat removal from the widthwise end of a slab when casting a metal or an alloy by a continuous casting method. It is characterized by using a mold having a rectangular through hole between a graphite mold at the widthwise end of the piece and a water cooling jacket. In the present invention, the reason for using a mold having a rectangular through hole between the graphite mold and the water cooling jacket at both ends of the mold corresponding to both ends in the width direction of the slab as the continuous casting mold is the most slab. This is because the cooling of the end portion in the width direction of the mold, in which the amount of heat removed from the mold is large, is relaxed and the amount of heat removed in the width direction of the slab is made uniform.

[0010]

The function of the present invention will be described in detail below. In the present invention, the molten metal is supplied from one of the molds, the molten metal is cooled in the mold, and when continuously extracting the slab from the other end, the molten metal introduced into the mold is the upper and lower surfaces of the mold and Cooling from four sides, the portions corresponding to both ends of the slab in the width direction solidify faster. When the solidification progresses to a certain extent, the slab separates from the mold due to solidification shrinkage, and the slab at the end in the width direction is cooled through the air gap to form a so-called air gap. Since rectangular through holes were made between the graphite mold and the water cooling jacket at both ends of the mold corresponding to both ends in the width direction, the cooling of the width end of the mold with the largest amount of heat removed from the slab is relaxed. The amount of heat removed in the width direction of the slab can be made uniform. The size and shape of the rectangular through hole provided between the graphite mold and the water cooling jacket are appropriately changed according to the size and shape of the cast piece to be cast.

[0011]

Embodiments of the present invention will now be described with reference to the drawings. It is a horizontal type continuous casting apparatus schematically shown in FIG. 1, using this horizontal type continuous casting apparatus with the continuous casting mold of the present embodiment shown in FIG. 2, and a conventional example shown in FIG. An experiment of continuously casting three kinds of phosphor bronze slabs with and without the continuous casting mold is described. In this experiment, the presence or absence of deformation of the slab was confirmed during casting, and the graphite mold was removed after casting and the condition of the inner surface was observed. The results are shown in Table 1 together with the size and shape of the slab, that is, the size and shape of the slab emerging from the graphite mold that guides the molten metal.

[0012]

[Table 1]

As shown in Table 1, as a continuous casting mold, rectangular through holes were provided between the graphite mold and the water cooling jacket on both ends of the mold corresponding to the widthwise ends of the slab according to this embodiment. It was found that when a mold was used, a slab without deformation was obtained regardless of the size and shape of the slab, and the inner surface of the graphite mold was not damaged.

[0014]

As described above, according to the present invention, since rectangular through holes are provided between the water-cooling jacket and the graphite mold at both ends of the mold corresponding to the widthwise ends of the slab, The amount of heat removed from the slab is the largest, the cooling of the end of the mold in the width direction can be relaxed, and the amount of heat removed in the width direction of the slab can be made uniform, so that the slab does not deform There is an effect that it is possible to stably pull out.

[Brief description of drawings]

FIG. 1 is a diagram showing a partial cross section of a horizontal continuous casting apparatus.

FIG. 2 is a front view of a continuous casting mold according to the present invention.

FIG. 3 is a front view of a conventional continuous casting mold.

[Explanation of symbols]

 1 Holding furnace 2 Molten metal 3 Mold 4 Mold body (graphite mold) 5 Water cooling jacket 6 Mold outer frame 7 Cast slab 8 Pinch roll 9 Through hole provided between graphite mold and water cooling jacket

Claims (1)

[Claims] 1. A mold used for producing a metal or an alloy by a continuous casting method, wherein a rectangular penetration is made between a graphite mold and a water cooling jacket at both ends of the mold corresponding to both ends in the width direction of the slab. A continuous casting mold having holes.