JPH0289517A - Direct hot rolling method for stock fed directly from continuous casting machine - Google Patents

Abstract

PURPOSE:To enable utilizing the sensible heat of interrupted rolled stock and to obtain effect of energy saving by providing a conveying pass and heating furnace for the direct feeding stocks between the continuous casting machine and hot rolling mill, heat insulating through a heat insulating mode at reversely loading the direct feeding stocks. CONSTITUTION:The steel billet 1 is conveyed through the conveying pass 2 equipped with conveying roll group 7 and stopped before an extracting port 4 of the heating furnace 6. Receiving command of reverse charging, an extractor 3 is conveyed into the furnace, a walking beam 5 charges the billet 1 reversely into the furnace. By this method, the sensible heat of the interrupted rolled stocks are utilized to obtain the effect of energy saving.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention relates to a method for direct hot rolling of material directly delivered from a continuous casting machine.

[Prior art] In the direct hot rolling of directly delivered material from a conventional continuous casting machine, if the directly delivered material cannot be rolled for some reason (e.g. line trouble, insufficient material temperature), rolling is stopped before the hot rolling furnace. They were removed from the rolling line, temporarily stored in the factory, charged into a heating furnace, reheated, and then rolled.

[Problems to be Solved by the Invention] Originally, direct hot rolling of a material directly delivered from a continuous casting machine is a technique aimed at saving energy, but this objective cannot be achieved in the above cases.

[Means for Solving the Problems] The direct hot method according to the present invention includes a conveyance path for direct material between a continuous casting machine and a hot rolling mill, and an extraction port that is connected to the conveyance path and can be reversely charged. Direct heat of material directly delivered from a continuous casting machine, characterized in that a heating furnace is provided with a heating mode and a heat retention mode, and the heat retention mode is used to retain heat when the directly delivered material is reversely charged. This is an inter-rolling method.

[Function] In the method of the present invention, when rolling becomes impossible, etc., the directly delivered material is immediately reverse charged into the heating furnace and heat is retained using the heat retention mode, so that the heat of the unrolled material can be used.

[Example] The method of the present invention will be explained below using figures.

FIG. 1 is a flowchart defining operations such as reverse charging, reheating, and extraction of directly delivered material that has stopped rolling by the method of the present invention. This judgment operation is carried out by a dedicated computer (CP).
U).

The decision to stop direct rolling in the zero-roll method described below with reference to this flowchart is based on the rolling pitch and the operator's decision to stop the line. The rolling pitch is determined by the production efficiency in continuous casting, the production efficiency in hot rolling, and the temperature of the directly delivered material. If the CPU determines that the rolling pitch is not appropriate, or if the operator determines to stop the line, a reverse charging program is activated. The CPU sets the charging furnace number, the amount of movement of the walking beam (device for moving steel pieces in the heating furnace), and the amount of operation of the extractor (stripes extractor),
Directly delivered material) is transported to the front of the furnace from CC (continuous casting fi),
The front of the furnace is stopped, a free space is secured in the heating furnace by the movement of the walking beam, the unrolled material is reversely charged into the furnace by the extractor operation, and the inside of the furnace is instructed to switch to heat retention mode. Further, depending on the operator's judgment that rolling can be restarted, the CPU calculates the rolling pitch again and instructs the extraction of the steel billet from the heating furnace.

FIG. 2 is a diagram showing the positional relationship among the heating furnace, steel pieces, conveyance path, extractor, and walking beam. The m piece 1 is transported by a transport path 2 equipped with a transport roll group 7,
It stops in front of the extraction port 4 of the heating furnace 6. Upon receiving a reverse charging command, the extractor 3 is carried into the furnace, and the walking beam 5 reversely charges the steel billet 1 into the furnace. The arrow in the figure indicates the advancing direction of the steel billet 1. As a result of rolling according to the present invention, about 100 unrolled pieces were generated per month, but as a result of activating the reheating program according to the present invention, about 300 pieces were produced per month.
,000 kcal of heat could be saved.

[Effects of the Invention] As described above, according to the present invention, the sensible heat of the rolled material, which could not be recovered in the past, can be used, and a great energy saving effect can be obtained.

Kuwafutomo Flowchart〉

[Brief explanation of the drawing]

FIG. 1 is a flowchart that defines operations such as reverse charging, reheating, and extraction of the material directly delivered after rolling stopped by the method of the present invention, and FIG. 2 shows a heating furnace and a steel billet. It is a figure showing the positional relationship of a conveyance path, an extractor, and a walking beam. DESCRIPTION OF SYMBOLS 1... Steel billet, 2... Conveyance path, 3... Extractor 4... Extraction port, 5... Walking beam, 6
···heating furnace.

Claims (1)

[Claims] A heating furnace is provided between the continuous casting machine and the hot rolling machine, and is equipped with a conveyance path for direct material, an extraction port that can be reversely charged in contact with the conveyance path, and has a heating mode and a heat retention mode. A direct hot rolling method for directly delivered material from a continuous casting machine, characterized in that heat is retained using a heat retention mode during reverse charging of the directly delivered material.