Hot strip rolling mill

Details Hot strip rolling mill Hot strip rolling mill

1997-09-04

1999-07-13

Hail, III, Joseph J.

Metal deforming

By use of roller or roller-like tool-element

With modification or control of temperature of work, tool or...

B21B 2706

Patent

active

059211270

DESCRIPTION:

BRIEF SUMMARY
TECHNICAL FIELD

The present invention relates to a hot strip rolling mill. More particularly, the present invention relates to a strip cooling line arranged between a hot finishing mill and a coiler on a hot strip rolling line.
In a hot strip rolling mill, a strip is hot-rolled by a finishing mill to a predetermined thickness and coiled by a down-coiler. In the hot strip rolling mill, there is provided a strip cooling line between the finishing mill and the down-coiler. While the strip runs on the strip cooling line, it is cooled to a predetermined coiling temperature. This strip cooling line includes a run-out table composed of hundreds of motor-driven rollers and a water spray type cooling device or a laminar flow type water cooling device. The strip is cooled as follows. A lower surface of the strip conveyed on the run-out table is cooled by cooling water sprayed from among the rollers of the run-out table, and an upper surface of the strip conveyed on the run-out table is cooled by cooling water sprayed from an upper portion of the run-out table.
In this connection, when the strip is conveyed at high speed on the above roller table type run-out table, a front-end of the strip tends to fly upward, that is, a flying phenomenon may occur. When the flying phenomenon occurs, it is difficult for the strip front-end to be smoothly guided into the down-coiler. In order to prevent the occurrence of the above flying phenomenon, it is necessary to maintain the conveyance speed of the strip at about 700 m/min until the strip front-end is wounded round the mandrel of the down-coiler. Therefore, it is difficult to fully utilize the full capacity (the maximum capacity is approximately 1500 m/min) of the finishing mill at all times, which reduces the productivity.
In order to prevent the occurrence of the above problems, Japanese Examined Patent Publication No. 2-25214 discloses a technique in which the strip is attracted onto the run-out table by an electromagnetic force. However, the intensity of an electromagnetic force is in inverse proportion to the square of a distance. Therefore, when flying occurs for some reason such as a disturbance, it is very difficult to attract the flying strip front-end onto the run-out table again. Accordingly, the above technique is not sufficient to realize high-speed conveyance of the strip on the roller table while the front-end of the strip is prevented from flying upward.
Japanese Unexamined Patent Publication No. 7-204723 discloses a device in which a guide plate to suppress a curl of the strip front-end is arranged in a carriage that runs in conjunction with a strip sent out from a finishing mill. However, this device has no function to pull the strip front-end. Therefore, it is impossible to prevent the occurrence of a defective flatness of the strip in the process of cooling.


DISCLOSURE OF THE INVENTION

It is an object of the present invention to provide a highly efficient hot strip rolling mill in which the occurrence of a flying phenomenon of a strip front-end can be prevented when the strip is conveyed on the run-out table at high speed, so that the threading performance of the finishing mill is not deteriorated.
It is another object of the present invention to decrease the coiling time after the completion of hot-finishing and reduce the equipment cost by shortening the length of the run-out table.
A feature of the hot strip rolling mill of the present invention is to include a strip front-end arresting device arranged on the strip cooling line between the finishing mill and the down-coiler, so as to hold a strip front-end and move it from the exit of the finishing mill to the down-coiler.
Other feature of the strip cooling line is to include a pinch roller and a cooling water spraying device which can be retracted from the path of the strip front-end arresting device while the strip front-end arresting device passes on the strip cooling line, and in which, after the strip front-end arresting device has passed, the pinch roller and the cooling water spraying device ar

REFERENCES:
patent: 3811305 (1974-05-01), Saylor, Jr.
patent: 3913369 (1975-10-01), Field et al.
patent: 5276952 (1994-01-01), Thomas et al.

Affiliated with

Also associated with

Rating

Hot strip rolling mill does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Hot strip rolling mill, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Hot strip rolling mill will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2266568