JPS58157563A - Supporting roll of ingot in continuous casting installation - Google Patents

Abstract

PURPOSE:To provide a titled supporting roll which prevents the considerable decrease in the temps. in both end parts of an ingot by forming the diameter in both end parts smaller than the diameter in the central part, and covering the outside circumferential surfaces thereof with heat insulating materials. CONSTITUTION:About 100 pieces of supporting rolls 9 made of metals are provided to support and convey an ingot 6 in a continuous casting installation of a curved type wherein the molten steel 3 charged from a ladle 1 through a tundish 2 into a casting mold 4 is curved downward and is drawn by many guide rolls 5 and the ingot 6 obtd. by straightening and solidifying the molten steel gradually horizontally is cut with a cutter 7 to the ingot 6 of a prescribed length. The diameter D2 in both end parts of the above-mentioned rolls 9 which are supported horizontally by means of bearings 8 are formed smaller than the diameter D1 in the central part and the outside circumferential surface thereof is coated with heat insulating materials 10, such as ceramics, to the thickness at which said surface do not contact the ingot 6. The length of the coverings is set at such a degree at which about 300mm. from the end parts of the ingot 6 is covered.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a slab support roll in continuous casting equipment, particularly in curved continuous casting equipment.

An overview of the method of casting slabs in curved continuous casting equipment will be explained with reference to FIG.

The molten steel 3 injected from the ladle l into the tundish 2 is injected from the tundish 2 into the mold 4.

1- The molten steel 3 injected into the mold 4 is continuously drawn out from the lower part of the mold 4 while being curved downward by a large number of slab guide rolls 5. After this, the slab 6 is gradually straightened horizontally, and the completely solidified slab 6 is cut into a predetermined length by a cutting device 7 and transported to the next process.

By the way, the conventional cutting machine 6 cuts the material into a predetermined length.
Generally, the cast slab is once cooled to room temperature and then subjected to flaw removal and the like, after which it is reheated in a heating furnace and transported to a rolling line for the primary process.

However, the above method requires cooling equipment to cool the high temperature slab of 900°C or higher to room temperature immediately after cutting, and a heating furnace to reheat the slab after removing defects, etc. In addition to requiring equipment costs, it also resulted in a large amount of energy loss.

Therefore, due to various improvements in casting methods in recent years, it has become unnecessary to take out the eaves of the slab.

For the purpose of reducing the above equipment costs and saving energy, etc., the high-temperature slab immediately after cutting is not cooled to room temperature, and
Convey directly to the rolling line as is. So-called hot direct rolling (HDR) has been partially attempted.

In order to carry out the above-mentioned hot direct rolling, it is sufficient to prevent the temperature of the slab from decreasing, but continuous casting equipment is equipped with around 100 metal slab support rolls, and a second As shown in the figure, these bearings 8
A large number of slab support rolls 9' are horizontally supported by
are in contact with the entire inside of the slab 6. Therefore, the temperature drop of the slab 6 due to contact with the roll 9' reaches 50 degrees of the temperature drop of the entire slab, and the temperature drop at both ends of the slab is particularly severe, as described above. , roll 9'
When the slab is in contact with the entire slab 6, the temperature at the end surface of the slab is approximately 200% higher than the temperature at the center surface of the slab.
As low as ℃.

The present invention provides a slab support roll for solving the above-mentioned problems, in which the diameter of both ends is smaller than the diameter of the center part, and the outer circumferential surface of both ends 3- is heat-insulated. It is characterized by being covered with wood.

The present invention will be explained by way of examples with reference to the drawings.

FIG. 3 is a cross-sectional view showing how the slab is supported by rolls according to an embodiment of the present invention, and FIG. 4 is an enlarged view of the same essential parts.

In FIGS. 3 and 4, reference numeral 9 denotes a slab support roll of the present invention, which is supported horizontally by square bearings 8 like conventional rolls. The difference from conventional rolls is that the diameter D2 at both ends of the roll is smaller than the diameter D1 at the center of the roll, and the outer peripheral surfaces of both ends are covered with a heat insulating material 10 of low thermal conductivity such as ceramics. By the way.

The length of both ends covered with the heat insulating material 10 is such that when the slab 6 is supported by the roll 9, approximately 3005 m from the end of the slab 6 can be covered with the heat insulating material 10. Satoru.

The diameter D2 at both ends of the roll is about 5 fins smaller than the diameter D1 at the center of the roll, and the thickness of the heat insulating material 10 is as follows.

4- The thickness is such that the heat insulating material 10 does not come into contact with the slab 6.

If the slab support roll configured in this manner is used, both ends of the slab will not come into contact with the slab support roll.

Therefore, a drop in temperature at both ends of the slab can be reliably prevented. That is, when using conventional rolls.

The temperature difference between the center of the slab and the ends of the slab was about 200°C, but when the roll of this invention is used.

A temperature difference of about 80 to 100°C can be suppressed.

As explained above, according to the present invention, it is possible to reliably prevent a drop in temperature at both ends of the slab due to contact with the slab support roll, without losing the function of the slab support roll. effect is brought about.

[Brief explanation of the drawing]

FIG. 1 is a schematic explanatory diagram of continuous casting equipment, FIG. 2 is a sectional view showing how a slab is supported by a conventional slab supporting roll, and FIG. 3 is a slab supported by a roll according to an embodiment of the present invention. The cross-sectional view showing the aspect, FIG. 4, is an enlarged view of the main part. In the drawing, =5- 1...Ladle 2...Tandish 3
... Molten steel 4 ... Mold 5 ... Slab guide roll 6 ... Slab 7 ... Cutting device 8
, 8'... Bearing 9.9'... Slab support roll Applicant Nippon Koukan Co., Ltd. Agent Keitabe Tsutsumi (and 1 other person) 6- 乍Fig. 2 9'9' Soft 3 Fig. 4 Fig.

Claims (1)

[Claims] 1. A slab support roll for continuous casting equipment, characterized in that the diameters of both ends are smaller than the diameter of the center part, and the outer peripheral surfaces of the both ends are covered with a heat insulating material.