JPS61154734A - Horizontal and continuous casting machine - Google Patents

Abstract

PURPOSE:To permit the attachment of a break ring in a short period and to extend the service life of a horizontal mold by fitting the break ring to the aperture on the inlet side of the horizontal mold via a spacer ring. CONSTITUTION:The break ring 6 having a tapered outside peripheral surface mates with the outside peripheral surface of the ring 6 and is fitted to the rear end of the spacer ring 8 having the tapered surface to accept the same. The ring 6 is thus attached quickly to the surface of the inlet aperture of the horizontal mold 4 without the need for lapping the outside peripheral surface of the ring 6 to the surface of the inlet aperture of the mold 4, unlike in the conventional practice, in the case of attaching the ring 6 to the mold 4. The service life of the mold 4 is extended as the inside peripheral surface of the mold 4 in contact with the outside peripheral edge at the top of the ring 6 does not wear.

Description

[Detailed description of the invention] [Technical field of invention] This invention relates to a horizontal continuous casting machine.

[Prior art and its problems]

In recent years, horizontal continuous casting machines for manufacturing cast steel billets have been put into practical use. In this machine, cast steel billets are pulled out and pushed back from a horizontal mold attached to the lower side wall of a tundish containing molten steel. It is pulled horizontally and intermittently through multiple cycles of

The above-mentioned known horizontal continuous casting machine will be explained with reference to FIG. In Figure 3, a tundish 1 receives molten steel 2 from a ladle (not shown). A front nozzle 3 is fitted into an opening IA formed in the lower part of the side wall of the tundish 1. A horizontal mold 4 having a cooling water passage 4A is horizontally attached to the front nozzle 3 via a feed nozzle 5 and a break ring 6.

The rear end of the feed nozzle 5 is fitted horizontally to the tip of the front nozzle 3. A break ring 6 having an outer circumferential surface with a minus sign (-) matches and receives the outer circumferential surface.
It is fitted into the entrance opening of the horizontal mold 4. The outer circumferential surface of the break ring 6 is pressed against the surface of the entry side opening of the horizontal mold 4 by the feed nozzle 5 .

The break ring 6 has the function of reliably creating a solidification starting point for the molten steel 2 cast in the horizontal mold 4 and allowing the cast steel piece 7 to be smoothly pulled out from the horizontal mold 4. On the downstream side of the horizontal mold 4, a cooling zone (not shown) is provided for cooling the cast steel billets that are intermittently pulled out from the horizontal mold 4 in the horizontal direction by pinch rolls, which will be described later. And a pinch roll (not shown).

The cast steel billet is pulled out from the horizontal mold 4 horizontally and intermittently through a plurality of cycles, each consisting of pulling out, lifting, and pushing back.

The cast steel slab 7 is manufactured as follows using the above-mentioned known horizontal continuous casting machine. The molten steel 2 accommodated in the tandate/yu 81 is passed through the front nozzle 3 and the feed nozzle 5.
and is cast into the horizontal mold 4 through the break ring 6. The cast steel piece 7 thus cast is intermittently pulled out from the horizontal mold 4 in the horizontal direction by the pinch rolls. The cast steel piece 7 pulled out from the horizontal mold 4 is cooled in the cooling zone. In this way, the cast steel pieces 7 are continuously cast.

In the above-mentioned conventionally known horizontal continuous casting machine.

Adhesion between the outer circumferential surface of the break ring 6 and the surface of the entrance opening of the horizontal mold 4 is particularly important, and if there is a gap between the outer circumferential surface and the surface of the entrance opening, the casting Molten steel 2 is inserted into the gap and solidified to form a base metal. If metal is formed in the gap in this way, the solidification shelf A of the cast steel piece 7 will not be formed properly.

For this reason, defects occur on the surface of the cast steel billet, and breakouts occur in some cases.

Therefore, conventionally, when replacing the brake ring 6,
The outer circumferential surface of the break ring 6 was polished by a slitting operation so that no gap would be formed between the outer circumferential surface of the break ring 6 and the surface of the entrance side opening of the horizontal mold 4.

However, the above-mentioned slitting operation was extremely difficult to perform because the horizontal mold number was installed in a fixed position. Furthermore, it was not possible to confirm whether the outer peripheral surface of the break ring 6 and the surface of the entrance opening of the horizontal mold 4 were securely mated.

Furthermore, the inner circumferential surface of the horizontal mold 4 with which the outer circumferential edge of the molten steel outlet side of the break ring 6 is in contact is prone to wear, so that the service life of the horizontal mold 4 is short.

[Purpose of the invention]

Therefore, an object of the present invention is to easily perform the work of slitting the outer peripheral surface of a break ring and the surface of the entrance opening of the horizontal mold, and to ensure that the outer periphery surface and the surface of the entrance opening It is an object of the present invention to provide a horizontal continuous casting machine in which it is easy to check whether or not the horizontal mold is being used, and the service life of the horizontal mold is long.

[Summary of the invention]

This invention includes a tundish for receiving molten steel from a ladle, and a feed nozzle and a break ring provided at the lower side wall of the tundish.

a horizontal mold mounted horizontally; a cooling zone for cooling the cast steel billet pulled from the horizontal mold; and a pinch roll for pulling the cast steel billet horizontally and intermittently from the horizontal mold. The break ring is fitted into the entrance opening of the horizontal mold, and the break ring is inserted into the entrance opening of the horizontal mold by the feed nozzle horizontally attached to the lower part of the side wall of the tundish. The horizontal continuous casting machine is characterized in that the break ring is fitted into the entrance opening of the horizontal mold via a spacer ring.

[Structure of the invention]

Next, the present invention will be explained with reference to the drawings.

FIG. 1 is a sectional view of essential parts of an embodiment of the present invention.

As shown in FIG. 1, a horizontal mold 4 having a cooling water passage 4A is connected to a front nozzle (not shown) via a feed nozzle 5, a break ring 6, and a spacer ring 8 as shown in FIG. mounted horizontally. The rear end of the feed nozzle 5 is fitted horizontally to the tip of the front nozzle. A tapered surface is formed at the tip of the spacer ring 8. The spacer ring 8 fits into the entry opening of the horizontal mold 4, which has a tapered surface that matches and receives said surface of the spacer ring 8. There are no steps or gaps between the inner circumferential surface of the spacer ring 8 and the inner circumferential surface of the horizontal mold 4. Machining both surfaces in this way can be easily carried out because the spacer ring 8 and the horizontal mold 4 are made of metal. A break ring 6 with a tapered outer circumferential surface has a spacer ring 8 with a tapered surface that matches and receives said outer circumferential surface of the break ring 6.
It is fitted to the rear end of the The surface formed at the tip of the spacer ring 8 is pressed against the surface of the entrance opening of the horizontal mold 4 by the feed nozzle 5. The outer peripheral surface of the break ring 6 is pressed against the surface formed at the rear end of the spacer ring 8 by the feed nozzle 5.

The spacer ring 8 is made of, for example, a copper alloy to which beryllium is added, and a cooling water passage 8A is formed in the circular portion of the spacer ring 8, and cooling water is supplied to the cooling water passage 8A during manufacturing. Cool down common sense by letting it pass.

The configuration other than providing the spacer ring 8 in this way is the same as the configuration of the conventionally known horizontal continuous casting machine described above.

The above is a case of a square billet, but the same applies to a round billet.

The cast steel slab 7 is continuously produced using the above-described horizontal continuous casting machine of the present invention in the same manner as in the conventionally known horizontal continuous casting machine.

〔Effect of the invention〕

As explained above, according to the present invention, unlike conventional horizontal continuous casting machines, the break ring is not directly fitted into the entrance opening of the horizontal mold, but is inserted into the entrance opening of the horizontal mold via the spacer ring. By fitting,
The following effects are brought about.

(1) When attaching a break ring to a horizontal mold, there is no need to slit the outer circumferential surface of the break ring to the surface of the entrance opening of the horizontal mold, as is the case with conventional methods.
Since the outer circumferential surface of the brake ring only needs to be aligned with the tapered surface formed at the rear end of the spacer ring, the brake ring can be attached to the horizontal mold in a short time.

Furthermore, confirmation can be easily performed. This is because the spacer ring is lightweight and easily removed from the horizontal mold.

(2) Unlike conventional horizontal continuous casting machines, the inner peripheral surface of the horizontal mold that comes into contact with the outer peripheral edge of the tip of the break ring does not wear out, so the service life of the horizontal mold is extended.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of essential parts of an embodiment of the present invention. FIG. 2 is a perspective view of a spacer ring according to the present invention, and FIG. 3 is a sectional view of a main part of a conventional horizontal continuous casting machine. In the drawing,

Claims (1)

[Claims] A tundish for receiving molten steel from a ladle;
a horizontal mold horizontally attached to the lower side wall of the tundish through a feed nozzle and a break ring; a cooling zone for cooling the cast steel billet drawn from the horizontal mold; and a cooling zone for cooling the cast steel billet drawn from the horizontal mold. a pinch roll for pulling out intermittently in the direction; the break ring is fitted into the entrance opening of the horizontal mold; In a horizontal continuous casting machine in which the input side opening of the horizontal mold is pressed by a feed nozzle, the break ring is fitted into the input side opening of the horizontal mold via a spacer ring. A horizontal continuous casting machine featuring: