SU1304945A1 - Method of cold rolling of plates - Google Patents

Abstract

The invention relates to the field of rolling production, can be used in the production of cold rolled sheet steel and allows to increase the productivity of the mill. During rolling on the multi-mill mill, the rolls are transshipped. After each roll change, rolling for 10-30 minutes is performed with different cuts in the middle and edges of the strip. The difference in reduction is 0.4-0.7%. Rolling is done at an increased rate. from 4 CO 4: 01

Description

This invention relates to rolling production, in particular to the production of thin-sheet cold-rolled sheet.

The purpose of the invention is to increase the productivity of the mill by increasing the rolling speed during the heating of the rolls.

Example. On a continuous 5-glue mill, the metal was rolled with a starting thickness of 2.2 mm to a final thickness of 0.25 mm. Width of preparation is 730 mm. The thickness of the workpiece does not vary along its width.

After transshipment of the work rolls, a billet is assigned for rolling, having a thickness in the middle of .2.20, and x 2.12 mm, t, e, with a curved shape on the edges. Such a billet is produced by rolling on a hot rolling mill with working rolls of the last stand, having a concave profiling,

When rolling such a billet to a final thickness of 0.25 mm, compression in the middle of the strip is carried out with

 88.7%, on the margin from 88.2%.

The difference in compression between the middle and the edges is 0.4%,

Experiments show that the problem in the camp at. billet warming up period with edges less than 2.10 mm thick {€ s

-e,

0.7%) the warm-up time becomes less than 10 minutes, but the strip from the mill leaves with a warpiness exceeding the allowable one. At thickness

Editor H, dumb

Compiled by, Vasiliev

Tehred M. Khodanich Proofreader L. Patay

Order 1369/10. Circulation 481 Subscription

VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab ,, d, 4/5

Production and printing company, Uzhgorod, st. Design, 4.

the edge of the workpiece is more than 2.14 mm (- - f to 0.4%) the strip has a waviness along the edges that exceeds the permissible, besides, the heating time of the rolls exceeds 30 minutes, which is ineffective since the heating is at a lower rolling speed.

If the value of}. is in the range of about 4-0.7% and the heating time is 10-30 minutes, the heating is carried out at the operating rolling speed.

With the known method of cold rolling sheet heating rolls

after transshipment is performed at a reduced speed, and the rolled strip at the same time acquires a wavy edge.

The proposed method allows the rolls to be heated at an operating rolling speed with satisfactory quality of the strip.

Claims (1)

Invention Formula The method of cold rolling of tin, including the gradual compression of the workpiece on a multi-stand mill, characterized in that in order to increase mill productivity by increasing the rolling speed, during the heating up of the rolls after each roll change, rolling for 10-30 minutes is carried out with a difference in the middle and edge of the strip of 0.4-0.7%,