JPH04100659A - Twin drum type continuous casting apparatus - Google Patents

Abstract

PURPOSE:To reduce the wear of a side weir at a near kissing point and to prolong the service life of side weir by sealing a lubricant just near both side weirs in pouring basin part and providing a lubricant supplying means for charging a metal tube melted with molten metal in the pouring basin part in a twin drum type continuous casting apparatus. CONSTITUTION:A coil of the metal tube wound round a reel 2 with powdery lubricant F enclosed therein, is fed out with pinch rolls 3 at the same time of starting the continuous casting for cast strip S, and the curl-state thereof is straightened with straightening rolls 4 and supplied to just near refractory 56 in each side weir 55 at both ends of the pouring basin part 50 with a guide nozzle 5 shown by the mark D. The metal tube T having almost the same material as the molten metal R, is melted by receiving sensible heat of the molten metal R just before solidified part at the kissing point, and the lubricant F is discharged into the molten metal R. This discharged lubricant F is guided to between both end parts of the cast strip S, cooling drums 51 and the sliding faces of the refractories 56 in the side weirs 55 with the oscillation of the side weirs 55 in the lateral direction and the wear of this refractory 56 is reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a twin-drum continuous casting apparatus that prevents wear of side weirs forming a sump.

[Conventional technology]

FIG. 4 is a side view showing essential parts of an example of a conventional twin-drum continuous casting apparatus, and FIG. 5 is a cross-sectional view taken along the line -■ in FIG. 4.

In these drawings, reference numeral 51 represents a pair of cooling drums, which rotate relative to each other in the direction of the arrow.

Reference numeral 55 designates a pair of side weirs, whose refractory material 56 is pressed against both end surfaces of both cooling drums 51, and is given a small width vibration in the lateral direction. The cooling drum 51 and the refractory material of the side weir 55 form a pool 50. Reference numeral 58 denotes a tandy noche for storing the molten metal R, and 59 denotes an immersion nozzle for supplying the molten metal from the tandem unit 5B to the sump 50.

In this device, cooling water is passed through both cooling drums 51 while rotating to cool them. Molten metal R in 58
is continuously supplied from the immersion nozzle 59 to the sump 50 as shown by arrow C, cooled and solidified by the cooling drum 51, and then cooled at a predetermined point at the kissing point (the closest point between the outer peripheral surfaces of both cooling drums). A slab S formed to a plate thickness of is pulled out from below the sump as shown by arrow B.

[Problem to be solved by the invention]

In the conventional apparatus described above, the vicinity of the xosing point of the refractory material 59 of the side weir 55 slides on both high-temperature ends of the solidified slab S and the end face of the cooling drum 51, so it is heavily worn. It shortens lifespan.

Therefore, the operation of the equipment is stopped in a short time and the side weir 55 is closed.
This makes it difficult to perform large-capacity continuous casting over a long period of time.

The present invention has been proposed to solve the above problems, and is a twin drum type that reduces wear near the kissing point of the side weir, extends the life of the side weir, and enables continuous casting with a larger capacity. The purpose is to provide continuous casting equipment.

[Means for Solving the Problems] To achieve the above object, the present invention includes a pair of cooling drums that rotate relative to each other and a pair of side weirs on which both end surfaces of the cooling drum slide. In a twin-drum continuous casting machine that continuously casts strip-shaped slabs by supplying and solidifying molten metal to a molten metal pool, a lubricant is sealed in the vicinity of both side weirs of the molten metal sump. A lubricant supply means is provided for inserting a metal tube that is melted with the molten metal.

[Effect]

In the present invention, when the molten metal is supplied to the sump and is cooled and solidified by the cooling drum, metal tubes filled with lubricant are inserted in the vicinity of both side weirs of the sump, and the molten metal tubes are inserted into the molten metal near the side weirs of both sides of the sump, so that the molten metal is cooled and solidified by the cooling drum. The metal tube is melted just before the solidified part of the slab, and the lubricant is released into the molten metal. This lubricant is guided to the sliding surfaces of the slab, cooling drum, and side weir, and exhibits a lubricating effect.

Incidentally, since the lubricant dissipating into the molten metal is undesirable in terms of the quality of the slab, the thickness and supply rate of the metal tube are adjusted so that the metal tube melts just before the solidified part of the slab.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 to 3.

Note that the same reference numerals are given to the same members and parts as those of the conventional device, and redundant explanation will be omitted.

Figure 1 is a front view cut vertically through the center of the pool between both cooling drums, Figure 2 is a side view with one side weir removed, and Figure 3 shows the main parts of Figure 1. FIG. 3 is an enlarged cross-sectional view.

In these drawings, a frame 1 is loaded with a coil of a metal tube T, and a roll 2 is rotatably attached to the frame 1, and a pinch roll 3 of the metal tube T and a straightening roll 4 below the pinch roll 3 are shown. is rotatably attached to the frame 1, and the pinch roll 3 and the straightening roll 4 are arranged to rotate in synchronization with each other by a drive device (not shown) within the frame. Also, frame 1
A guide nozzle 5 made of ceramic or the like is fixedly provided below the straightening roll 4 at the lower part of the straightening roll 4 . These members constitute a pair of lubricant charging devices 10. The lubricant charging device 10 is disposed above each side weir 55 on both sides of the tundish 58. Furthermore, a powdered lubricant F such as graphite is sealed inside the metal tube T, and the metal tube T is made of the same material metal as the molten metal that is melted by the sensible heat of the molten metal in the sump 50. It is formed.

In this embodiment configured as described above, the coil of the metal tube T filled with the powdered lubricant F loaded on the reel 2 is fed out by the pinch roll 3 at the same time as the continuous casting of the slab S starts. The straightening roll 4 corrects the curl, and the guide nozzle 5 supplies the refractory material 56 of the side weirs 55 at both ends of the tundish portion 50, as shown by the arrows in FIG.

A metal tube T made of substantially the same material as the molten metal R is melted by receiving the sensible heat of the molten metal R immediately before the solidification part of the molten metal R, and releases the lubricant F into the molten metal R.

This released lubricant F is transferred to both end shells of the slab S and to the cooling drum 5 by small lateral vibrations of the side weir 55.
1 and the sliding surface of the refractory material 56 of the side weir 55, reducing wear of the refractory material 56.

In this case, if the lubricant F dissipates into the molten metal R, the quality of the slab S will deteriorate, so to prevent this dissipation, the thickness of the metal tube T must be adjusted so that the metal tube T melts just before the solidified part of the slab. and the feed rate is adjusted.

As described above, in this embodiment, the metal tube T filled with powdered lubricant F is supplied to the immediate vicinity of the refractory material of the side weirs at both ends of the molten metal R in the molten metal R in the molten metal sump 50. The same process is achieved by melting the tube T just before the solidified part of the slab at the kenoshing point and guiding the lubricant F to the sliding surfaces of the shells at both ends of the slab S, the cooling drum 51, and the refractory material 56 of the side weir 55. Abrasion of the refractory material 56 can be reduced. Incidentally, as the lubricant F, flux can also be used in addition to graphite. Further, the metal tube T filled with the lubricant F can be manufactured by the same manufacturing method as a known welding rod for non-gas semi-automatic welding.

〔Effect of the invention〕

As explained in detail above, in the present invention, metal tubes filled with a lubricant are inserted in the vicinity of both side weirs of the molten metal, and the metal tubes are melted by the molten metal, so that the lubricant is introduced into the molten metal. By releasing this lubricant into the sliding parts of the slab, cooling drum, and side weir, this lubricant is guided and lubricates the sliding parts of the slab, cooling drum, and side weir, so that wear of the side weir can be reduced.

For this reason, the life of the side weir can be extended, and 1
The capacity of continuous casting can be increased.

[Brief explanation of drawings]

FIG. 1 is a front view of a twin-drum continuous casting apparatus according to an embodiment of the present invention, with the central part cut away in the vertical direction, FIG. 2 is a side view of the same embodiment with one side weir removed, and FIG. The figure is an enlarged sectional view of the main part of Figure 1, Figure 4 is a side view showing an example of a conventional twin-drum continuous casting machine, and Figure 5 is a cross-sectional view of Figure 4.
−■ It is a sectional view. 1... Frame, 2... Reel 3... Vinci roll, 4... Straightening roll. 5... Guide nozzle, 10... Lubricant charging device 50
... Hot water pool part, 51 ... Cooling drum 55 ... Side weir, F ... Lubricant R ... Molten metal,
S... Slab T... Metal chew 7

Claims (1)

[Claims] Molten metal is supplied to a pool formed by a pair of cooling drums that rotate relative to each other and a pair of side weirs on which both end surfaces of the cooling drums slide, and is solidified to continuously cast strip-shaped slabs. A twin-drum continuous casting device, comprising a lubricant charging means for charging a metal tube that seals a lubricant immediately adjacent to both side weirs of the sump and is melted by the molten metal in the sump. A twin-drum continuous casting device featuring: