JPS60238001A - Continuous production of thin sheet - Google Patents

Abstract

PURPOSE:To improve a casting speed by controlling the crater position of a sheet material in a prescribed range and maintaining the temp. of the sheet material in the inlet side of a rolling mill at the temp. suitable for rolling. CONSTITUTION:Crater position detectors 8, 8 spaced at a required distance are provided between a continuous casting machine 1 and the rolling mill 4. The detector 8 is constituted of light-draft rolls 9, 9 sandwiching the sheet material 3 and a load cell 10 to detect the reaction thereof. The casting speed of the machine 1 is feedback-controlled in such a way that the crater position exists at all times between the detectors 8 and 8. An online temp. detector 11 is further provided on the upper stream side of the rolling mill 4 and the sheet material 3 on the upper stream of the mill 4 is cooled by a cooler 12 so as to be maintained in a prescribed temp. range. The casting speed is made highest by the above-mentioned method under the mutual association of the rolling temp. and the crater position.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a continuous thin plate manufacturing method.

[Conventional technology]

The most common method for manufacturing thin metal sheets, and still in use today, is to cast a thick slab using a continuous slab casting machine and roll it through a separate rolling line.
The sheet is rolled twice to make it thinner than 10 times, and then finished rolled to produce a plate. However, in this method, it is necessary to heat the slab and control it at a constant temperature for rolling, which requires a large amount of rolling energy as well as heating energy.

Against this background, in recent years, continuous plate casting machines such as block type, belt type, and twin roll type, which can cast metal plates directly from molten metal, have been developed. , a continuous thin plate production facility has been proposed that allows thin sheets to be rolled and finished to a predetermined thickness online.

However, in such continuous thin plate manufacturing equipment, no technology has been established that relates rolling temperature, crater tip position, casting speed, etc., and there are currently only a few examples of continuous thin plate manufacturing equipment being operated.

[Problem that the invention seeks to solve]

In view of these circumstances, the purpose of the present invention is to operate in association with rolling temperature, crater position, casting speed, etc., and to continuously manufacture thin plates at maximum speed within a range that satisfies these conditions. This is what I did.

[Means for solving problems]

The present invention is capable of casting using a continuous casting machine under conditions such that the crater position of the cast plate material is within a predetermined position range and the temperature of the plate material on the entrance side of the rolling machine is a temperature suitable for the rolling temperature. It operates at maximum speed.

〔Example〕

Hereinafter, the present invention will be described in detail with reference to the drawings.

The figure shows a continuous thin plate production facility for carrying out the method of the present invention, in which molten metal tapped from a steelmaking furnace such as a converter is placed in a ladle placed on a continuous casting machine (1). put in,
The molten metal in the ladle is poured into the mold of the continuous casting machine (1) through the tundish (2), and the thin plate material (3) that is solidified is rolled in the rolling mill (4) installed on the same line. It is rolled to a predetermined thickness and then wound into a coil by a winder (5) to form a hot coil. Nao (6
) is the temperature sensor, (force is the speed sensor).

The case where a thin plate is manufactured using such continuous thin plate manufacturing equipment will be explained.

Although the crater position in the plate material (3) cast from the continuous casting machine (1) is maintained at a constant position by the speed control of the continuous casting machine (1),
) may be displaced due to subtle changes in cooling conditions, etc.

If this crater position is located within the rolling process, for example,
Since the plate material (3) is rolled with the unsolidified layer still present, it is necessary to completely solidify the inside of the plate material (3) at least on the upstream side of the rolling mill (4). Therefore, continuous casting machine (1)
and the rolling mill (4), a crater is placed at the required interval.
A position detector (81 (8) is provided, and this detector (8) (
The casting speed of the continuous casting machine (1) is feedback-controlled so that the crater position always exists between 81 and 81. Incidentally, the crater position detector (8) consists of a light reduction roll (91 (9)) that clamps the plate material (3), and a load cell 00 that detects the magnitude of the reaction force of the roll (9) (91). ing.

Furthermore, the plate material (3) whose inside has become a completely solidified shell is rolled to a predetermined thickness in a rolling mill (4), but at this time, the temperature of the strip suitable for hot rolling is usually 1150 to 900.
℃, so it is necessary to control the humidity of the plate material (3) so that it falls within this range. Therefore, an online humidity detector (11) such as an infrared thermometer is provided upstream of the rolling mill (1), and the temperature detector 01) and the crater position detector (8
) A cooling device (121) installed between the rolling mill (4) and the plate material (3) is used to cool the plate material (3) upstream of the rolling mill (4) until it reaches a predetermined temperature range. A heladder etc. can be used. (I3) is a flow meter.

Further, in this case, the casting speed is further controlled based on the detected temperature of the plate material (3) so that the temperature of the plate material (3) is lowered only by cooling by the cooling device.

In this way, the continuous thin plate manufacturing method of the present invention
At the maximum casting speed within a range that satisfies various conditions such as the casting speed to position the position within a predetermined range, the humidity of the plate material (3) due to heat treatment at the entrance of the rolling mill, and the casting speed necessary for heat treatment. It carries out operations (5).

It should be noted that the present invention is not limited only to the above-mentioned embodiments, and it goes without saying that various changes can be made without departing from the gist of the present invention.

〔Effect of the invention〕

As explained above, according to the continuous thin plate manufacturing method of the present invention, the rolling temperature, crater position, etc. are correlated, and the thin plate is manufactured at the maximum casting speed within the range of these conditions. It becomes possible to concretely operate manufacturing equipment.

[Brief explanation of drawings]

The figure is an explanatory diagram of equipment for carrying out the continuous thin plate manufacturing method of the present invention. (1) is a continuous casting machine, (2) is a tanditshu, (3)
(4) is a rolling mill, (8) is a crater position detector, 01) is a temperature detector, and (12) is a cooling device.

Claims (1)

[Claims] 1) In a continuous thin plate production facility in which plate material cast by a continuous plate casting machine is rolled by a rolling mill arranged online, the crater position of the cast plate material is within a predetermined position range. Moreover, the continuous thin plate manufacturing method is characterized in that the continuous casting machine is operated at the maximum casting speed under conditions such that the temperature of the plate material at the entrance side of the rolling machine becomes a temperature suitable for the rolling temperature.