SU816600A1 - Method of removing scale - Google Patents

Description

(54) METHOD FOR REMOVING THE OKALINA

I

The invention relates to rolling production and can be used to remove scale from the surface of hot rolled strips.

There is a known method for removing mill scale by abrasive stripping. In this method, the scale from the surface of the hot rolled strip is removed with the help of drums rotating in the direction opposite to the movement of the metal 1.

The disadvantage of this method is the rapid and uneven wear of the surface of the drums.

There is also known a method for descaling and a device for its implementation, comprising several sets of working and support rollers, with plates with an abrasive surface on the surface of the working rollers.

During the stripping process, the rollers perform some front & rear swing movements to evenly wear the abrasive plates.

However, with such movement of the rollers ck; the org of stripping of the strip is small and, consequently, the performance of the scale removal line is low.

2

There is a known method for removing scale from the surface of a moving strip, based on: mechanically removing scale by passing the strip through a pair of rollers 3.

A disadvantage of the known method lies in the low productivity of descaling from the surface of the strip, since the difference in the peripheral speed of the rolls relative to the speed of movement of the strip is small. In addition, the strip is in contact with the same surface areas of the rolls, which causes their rapid and uneven wear.

The purpose of the invention is: - to increase the productivity of scale removal lines and reduce wolf wear.

This goal is achieved in that the scale is removed by the reciprocating movement of the rolls in opposite directions relative to each other in a direction perpendicular to the movement of the strip.

The speed of the reciprocating movement of the rolls varies in proportion to the speed of movement - the strip.

Example. A hot-rolled strip measuring 3 X 1250 mm moves at a speed of

2 m / s, around the barrel of a pair of dross rolls, in the line of the continuous pickling unit. The rolls having a diameter of 150 mm and a length of 2500 mm rotate at different peripheral speeds, the circumferential speed of the first roll (in the direction of travel of the strip) is 3.5 m / s, and the second speed is 4 m / s. In this case, the speed of the reciprocating movement of the rolls in a direction perpendicular to the movement of the strip is 6.6 m / s. The full movement of the rolls, when they are moving in different directions relative to each other, is 600 mm from one extreme position to the other.

When increasing the speed of movement of the strip through the rolls of the okalinol-mat, for example, by 1.5 times, i.e. up to 3 m / s, the speed of the reciprocating movement of the rolls increases in direct proportion also to 1.5 times, i.e. 0.9 m / s.

Claims (3)

1. A method of removing scale from the surface of a moving strip, comprising passing the strip through a pair of rolls, characterized in that in order to increase the productivity of the scale removal line and reduce roll wear, the scale is removed by reciprocating moving the rolls in opposite directions relative to each other in the direction perpendicular to the movement of the strip. 2. A method according to claim 1, characterized in that the speed of the reciprocating movement of the rolls varies in proportion to the speed of movement of the strip. Sources of information taken into account in the examination 1. “Das News, 1978, 34, No. 2, p. 86 - 87. 2. US patent number 3888048, cl. 51-39, publ. 1972. 3. Published Japanese Application No. 52-78630, cl. 120 p 221.2, 1977.