SU854470A1 - Rolling roll - Google Patents

Description

(54) ROLLED ROLLS

one

The invention relates to rolling production and improves the rolls of hot and cold rolling mills, in particular rolls of rolling mill mills.

In the production of sheet metal with coatings, in particular hotplate, the thickness and uniformity of the coating layer depends on the surface roughness of the metal before the coating and, consequently, on the surface roughness of the rolls.

A roll is known in which the surface of the roll barrel has a roughness that varies in the longitudinal and transverse directions. This roller is intended to improve the conditions for admission of lubricant to the deformation zone l.

A roll is also known, in which on the surface of the vashka barrel they create a directional micro-relief in the form of scratches along the line forming the barrel 2.

Known roll with a roughness applied on its working surface, variable around the perimeter. Moreover, the section of the working surface with the minimum rolling surface is made with a smaller roughness than the section of the working surface with the maximum rolling radius. The ratio of the minimum and maximum roughness of 0.1-0.5. The surface roughness on the surface between the minimum and maximum rolling radius varies in magnitude in proportion to the change in the rolling radius of the roll 3 J.10

In the production of sheet products, it tends to ensure the highest possible uniformity of the roughness of the rolled strips and, therefore, on the rollers, it tends to create a microrelief with the greatest possible uniformity.

The purpose of the invention is to improve the uniformity of the coating during the subsequent tinning of tin and the reduction of consumption

20 tin.

The goal is achieved by the fact that in the mill roll the roughness of the working surface of the barrel is performed

25 uniformly varying in size from one edge to another.

The roughness of the roll surface monotonously varies (increases or decreases) from one edge to 30 to the other. The pattern of roughness change may be expressed by a linear function.

The drawing shows the rolling mill, general view.

The drawing indicates: a - roughness from one side of the roll bar, b - roughness from the other edge of the roll. The roughness value a is greater than the roughness value b. From the color of the barrel a to the edge of the barrel b, the surface roughness decreases uniformly (monotonously) from a to a value b. The designations of the roughness value are made in accordance with GOST 2789-73.

 With cold npoKavKs of thin polo (tin) on continuous mills, as well as during training, the surface roughness of the rolls is imprinted on the surface of the rolled metal. Consequently, by changing the amount of roughness on the surface of the rolling or temper rolls along the length of their barrel, it is possible to influence the distribution of the surface roughness across the strip axis {in the direction perpendicular to the rolling axis).

Techniques for the production of tinplate tinning involves rolling tin on a continuous mill, training it, cutting strips on cards and then covering these cards in aggregates of tinning. At. Thus, the direction of movement of the tin cards in the aggregates is hot, which is perpendicular to the axis of the rolling of these cards. For example, a strip with a width of 712 mm after cold rolling on a cross-cutting unit is cut to lengths of 512 mm. During subsequent hot-dip tinning, the obtained tinplate cards are set in the unit in the direction parallel to the long side (712 mm), i.e., if during rolling the size of 712 mm represents the width of the strip, then during tinning it is the length of the tin card.

The design features of the aggregates and the technology of hot tinning of the tin cause a significant unevenness of the thickness of the coating in the direction of the tinning. Moreover, at the front end of a tin card during the tinning, the thickness of the tin coating is usually less than that at the back end. It has been established that the thickness of the coating during tin tinning is directly proportional to the roughness of the metal before tinning. in the proposed roll, the systematic thickening of the coating from the front end to the rear end of the tin card is compensated (excluded) by changing the roughness of the surface of the tin before tinning (cold rolled tin). For this, it is necessary that the surface roughness of the tin card decreases from the front end.

along the puddling to the rear. Accordingly, the surface roughness of the cold-rolled strip is variable in width, with a larger amount of roughness being on the surface on the side that, when subsequently tinned, enters the tinning unit. Consequently, the surface roughness of the roll barrel evenly monotonously varies from one edge of the strip to another.

In the set of work rolls installed in the cage, can be both rolls, and one upper or lower made according to the invention.

In the production of hot melt tinning, the thickness of the coating on the front end of the tin card is approximately 25 g / m and increases evenly towards the rear end (in the direction of the tin) with an average thickness of the coating 35-40 g / m, i.e. increases 1.6 times. The relationship between the average thickness of the coating and the roughness value has the form (with a change in RQ of 0.2-0.6 µm-)

:. h 30.6 + 22Ra where h is the average thickness of tin tin

coating, g / m

“D the value of the surface roughness of black cold-rolled sheet, micron. Since the coefficient of the roughness parameter is 22, to compensate for differences in coating thickness of 40–25 to 15 g / m, it is necessary to proportionally increase the roughness on the surface of the front end of the tin card compared to the back end by approximately 0.7 µm RQ Therefore, if At the end of the tin plate, the roughness is 0.3 µm RQ, then towards the front end it increases evenly to 1.0 µm RC. The roughness of the rolls forming the microrelief of the surface of the cold-rolled strips should also be changed in the same way. With this method of leveling the tin layer on the surface of the tin, the average value of the coating thickness increases, but the average value easily changes and adjusts the compression force of the rolls of the fat machine, pressing the brushes to these rolls.

The proposed mill roll is made as follows.

Claims (3)

A uniform increase in surface roughness from one roll edge to another is carried out during grinding, polishing rolls or their shot blasting notches, for example, by replacing a grinding wheel during processing — different parts of the surface of the roll barrel, by applying different intensity or duration of the shot flow to different parts of the surface along the length of the roll barrel. Other methods of manufacturing the proposed roll are possible. The proposed roll is most efficiently used as a worker in the last stand of a continuous cold rolling mill or in a mill rolling mill. The technical and economic efficiency of the proposed stand out is that the use of the proposed mill roll allows to increase the uniformity of covering the mountains of human iron plate and reduce unproductive consumption of tin. Claims Rolling mill for cold rolling sheet containing a neck and a barrel with a variable roughness applied on its working surface, characterized in that in order to improve the uniformity of the coating during the subsequent tinning and tin consumption, the roughness of the working surface of the barrel is uniformly changed in magnitude from one edge to another. Sources of information taken into account in the examination 1. US patent 3613319, cl. 51-289, publ. 1969. 2. Japanese Patent No. 13294, cl. 12 C 211.2, publ. 1972. 3 .. USSR Author's Certificate in Application No. 2544182/02, cl. B 21 B 27/02, 1977.