JPH044947A - horizontal continuous casting machine - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a horizontal continuous casting machine for continuously casting molten steel into cast steel slabs.

[Conventional technology]

Horizontal continuous casting machines are known for continuously casting molten steel into billets. In this machine, molten steel led from a tundish into a horizontal mold is passed through the horizontal mold intermittently and continuously in the horizontal direction by multiple cycles, each consisting of one pull and one push back. Generally speaking, it is drawn into cast steel pieces.

FIG. 4 is a schematic vertical sectional view showing a conventional horizontal continuous casting machine. As shown in FIG. 4, a metal horizontal mold 6 is connected to an opening 1a provided at the lower side wall of the tundish 1 that accommodates the molten steel 2 through a front nozzle 3, a feed nozzle 4, and a break ring 5. has been done.

The outer surface 5a of the break ring 5 is in liquid-tight contact with the inner surface 6a of the inlet end of the horizontal mold 6. break ring 5
This ensures that the starting point for solidification of the molten steel 2 led from the tundish 1 into the horizontal mold 6 through the front nozzle 3, feed nozzle 4 and break ring 5,
It has the function of allowing the cast steel piece 7 to be smoothly pulled out from the horizontal mold 6.

The horizontal mold 6 is made of copper or a copper alloy film, and has a cooling water passage 6b inside thereof. Cooling water circulates within the cooling water passage 6b to cool the horizontal mold 6.

Following the horizontal mold 6, at least one pair of pinch rolls (not shown) and a cooling zone (not shown) are provided. At least one pair of pinch rolls is configured to move the molten steel 2 guided into the horizontal mold 6 into one tension and one tension roll, respectively.
The cast steel billet 7 is drawn intermittently and continuously in the horizontal direction through the horizontal mold 6 by multiple cycles of two push-backs. The cooling zone cools the cast steel billet 7 thus drawn from the horizontal mold 6.

According to the above-mentioned known horizontal continuous casting machine, the cast steel piece 7 is
It is manufactured as follows. The molten steel 2 received in the tundish 1 passes through the front nozzle 3, the feed nozzle 4 and the break ring 5 to the horizontal mold 6.
Guided within. The molten steel 2 guided into the horizontal mold 6 is
by at least one pair of pinch rolls (not shown);
Through the horizontal mold 6, it is drawn intermittently and continuously in the water direction into a cast steel billet 7. and.

The cast steel billet 7 thus pulled out from the horizontal mold 6 is cooled while passing through a cooling zone (not shown). In this way, the cast steel pieces 7 are continuously cast.

[Problem to be solved by the invention]

The break ring 5 described above is melted or damaged as continuous casting progresses. In particular, the push-back force when pulling out the cast steel piece 7 is directly and concentratedly applied to the end face of the break ring 5, so that the break ring 5 is likely to be damaged by melting. If casting is continued with the break ring 5 melted or damaged, the inner surface 6a of the entrance end of the horizontal mold 6, which contacts the break ring 5, will also be damaged, as shown in a partially schematic vertical sectional view in FIG.

As described above, if the horizontal mold 6 is damaged due to melting or breakage of the break ring 5, the following problem will occur.

(a) The surface shape of the cast steel piece deteriorates, resulting in poor quality.

(b) During the next casting, the new break ring installed at the entrance end of the horizontal mold and the horizontal mold could not be joined in good condition, resulting in unstable casting and poor quality of the slab. occurs.

(C) In order to prevent the above-mentioned problems, it is necessary to frequently replace the horizontal mold 6, which requires a lot of labor and cost.

Japanese Patent Publication No. 1-31974 filed by the applicant of this patent states that as shown in a schematic vertical sectional view in FIG.
The upstream side 8C of the inner surface of the spacer ring 8 is aligned with the outer surface 5a of the break ring 5, and the downstream side 8d of the inner surface is aligned with the tapered entrance end inner surface 6a of the horizontal mold 6. A horizontal continuous casting machine is disclosed (hereinafter referred to as "prior art") in which the inner hole 9 formed by the inner surface 8b is a horizontal passage for molten steel.

However, the purpose of the spacer ring 8 in the prior art described above is to perform the soot fitting operation only between the break ring 5 and the spacer ring 8 when connecting the downstream end of the break ring 5 to the inlet end of the horizontal mold 6. height,
This allows the downstream end of the break ring 5 to be easily connected to the inlet end of the horizontal mold 6 in a short time.

In such a spacer ring 8, deformation, wear, damage, etc. due to thermal load are likely to occur on the inner surface 8b forming the inner hole 9, and the pushing back force when pulling out the cast steel piece 7 is similar to the conventional one. , brake ring 5 is applied. Therefore, the break ring 5 and the horizontal mold 6 cannot be prevented from being damaged as described above.

Therefore, an object of the present invention is to appropriately prevent damage to the horizontal mold and to reduce melting or breakage of the break ring. An object of the present invention is to provide a horizontal continuous casting machine for casting molten steel into billets.

[Means to solve the problem]

The present inventors have conducted extensive research in order to solve the above-mentioned problems. As a result, between the inlet end of the horizontal mold and the break ring, a ring made of gold jic, which has a width substantially the same as the width of the break ring and has a melting point at least higher than that of steel, is fitted, and this metal ring is It was discovered that damage to the break ring and horizontal mold could be prevented if the cast steel slab was subjected to the load during pushback.

This invention was made based on the above findings, and
a tundish for receiving molten steel to be cast; a horizontal mold connected to an opening provided in a lower side wall of the tundish via a front nozzle, a feed nozzle and a break ring; the front nozzle, the feed nozzle; and through the break ring and directing the molten steel from the tundish into the horizontal mold intermittently and through the horizontal mold by multiple cycles each consisting of one pull and one push back. In a horizontal continuous casting machine comprising at least one pair of pinch rolls for continuously drawing horizontal billets, the width of the break ring and the substantially A seating ring having the same width as that of steel and having a melting point at least higher than that of steel is fitted in such a way that it does not protrude beyond the break ring.

Next, this invention will be explained with reference to the drawings.
The figures are a schematic vertical sectional view showing an embodiment of the horizontal continuous casting machine of the present invention, FIG. 2 is a partially enlarged vertical sectional view thereof, and FIG.
The figure is a sectional view taken along the line A-A in FIG. 1. In FIGS. 1 to 3, 6 is a metal horizontal mold having a cooling water passage 6b.

The horizontal mold 6 is connected to an opening in the lower side wall of a tundish (not shown) for receiving molten steel via a front nozzle (not shown), a feed nozzle, and a 4° break ring 5.

In this invention, a metal seating ring 10 is fitted between the inner surface 6a of the entrance end of the horizontal mold 6 and the outer surface 5b of the break ring 5. The width of the seating ring 10 is substantially the same as the width of the break ring 5, and both end surfaces thereof do not protrude beyond the break ring 5.

An outwardly protruding flange 10a is formed on the outer periphery of the end of the seating ring 10 on the side of the feed nozzle 4, and the flange 10a engages with an annular step 11 formed at the entrance end surface of the horizontal mold 6. It matches. The outer surface of the seating ring 10 matches the inner surface of the horizontal mold 6. The inner surface of the seating ring 10 has a slight distance from the outer surface of the break ring 5 at one end where the flange 10a is formed, and is in contact with the outer surface of the break ring 5 at the other end. , gently sloping.

The seating ring 1o is made of, for example, any one of titanium, molybdenum, and tungsten, or
Use metals that have a higher melting point than steel and have as poor thermal conductivity as possible, such as composite materials such as cermets based on the metals mentioned above.

[Effect]

According to the horizontal continuous casting machine of the present invention, cast steel pieces are manufactured as follows. The molten steel received in the tundish 2 is guided into the horizontal mold 6 through a front nozzle (not shown), a feed nozzle 4, and a break ring 5 whose outside is protected by a seating ring 1o. The molten steel introduced into the horizontal mold 6 is drawn through the horizontal mold 6 into cast steel slabs 7 intermittently and continuously in the horizontal direction by at least one pair of pinch rolls (not shown).

The cast steel piece 7 thus pulled out from the horizontal mold 6 is cooled while passing through a cooling zone (not shown). In this way, the cast steel pieces 7 are continuously cast.

In this invention, as described above, the horizontal mold 6
A seating ring 10 is fitted between the inner surface 6a of the inlet end of the horizontal mold 6 and the outer surface of the break ring 5, and the inner surface 6a of the inlet end of the horizontal mold 6 is protected by the seating ring 10.

Therefore, even if the break ring 5 is melted or damaged during casting, the inner surface 6a at the entrance end of the horizontal mold 6 will not be damaged. Further, since the push-back force when punching the cast steel piece 7 is received by the seating ring 10, no push-back force is applied to the break ring 5. Therefore, the break ring 5 is less likely to be damaged or damaged.

The seating ring 10 may be replaced with a new one at any time depending on the degree of damage or wear, so that the inner surface 6a of the entrance end of the horizontal mold 6 is always protected.

〔Effect of the invention〕

As described above, according to the present invention, damage to the horizontal mold can be appropriately prevented, and break ring melting or damage can be reduced, which is an industrially useful effect.

[Brief explanation of drawings]

FIG. 1 is a schematic vertical sectional view showing an embodiment of the horizontal continuous casting machine of the present invention, FIG. 2 is a partially enlarged vertical sectional view thereof, and FIG. Fig. 4 is a schematic vertical sectional view showing a conventional horizontal continuous casting machine, Fig. 5 is a schematic vertical sectional view showing the horizontal mold inlet end of the conventional horizontal continuous casting machine, and Fig. 6 is a horizontal continuous casting according to the prior art. In drawing 0, which is a schematic vertical sectional view showing the machine, 1... Tandish, 2... Molten steel, 3... Front nozzle, 4... Feed nozzle, 5... Break ring, 6... Horizontal mold, 6a... Inner surface of the entrance end of the horizontal mold, 7... Cast steel piece, 8...
- Spacer ring, 9... Inner hole, 10... Seating ring, 11... Annular step.

Claims (1)

[Claims] 1. A tundish for receiving molten steel to be cast, and a horizontal tundish connected to an opening provided in the lower side wall of the tundish through a front nozzle, a feed nozzle, and a break ring. directing the molten steel from the tundish into the horizontal mold through the mold, the front nozzle, the feed nozzle and the break ring by multiple cycles each consisting of one pull and one push back; , at least one pair of pinch rolls for intermittently and continuously drawing horizontal slabs through the horizontal mold, an inlet end of the horizontal mold, and a break ring; A horizontal continuity characterized in that a sheeting ring having a width substantially the same as the width of the break ring and having a melting point higher than at least steel is fitted in between so as not to protrude beyond the break ring. Casting machine. 2. The sheeting ring is made of any one metal of titanium, molybdenum, and tungsten, or
The horizontal continuous casting machine according to claim 1, wherein the horizontal continuous casting machine is made of a composite material based on any one of the metals.