SU900894A1 - Sheet rolling mill rolling roll cooling method - Google Patents

Description

I

The invention relates to the metallurgical industry, specifically rolling production, and may be used to cool mill rolls.

Feature of rolling technology. on a sheet mill, rolling is carried out within one company (from transshipment to transshipment) of strips of various sizes. The thermal regime of the rolls, and in particular, the nature of the distribution of thermal loads, the width of the rolled strip has a significant effect.

A known method of cooling the rolls, in which the cooler is fed tangentially to the surface of the rolls. Similarly, the flow of the cooler tangentially to the surface of the roll does not allow effective use of the cooler due to the poor thermal contact between the cooler.

And roll, which in turn leads to large overruns cooler.

In addition, there is no possibility of stabilizing the thermal profile of the rolls during the rolling process and because of the inconsistency of the number of coolers to the distribution of thermal loads along the roll barrel.

The known method mill rolls sheet mills, including the supply

10 of the cooler onto the surface of the rolling rolls by flat streams at an acute angle to the roll axis of this method there is no possibility of stabilizing the thermal strip during the rolling process because the amount of the cooler does not correspond to the distribution of thermal loads along the roll barrel. The method of supplying the cooler with a uniform distribution of the jets along the length of the roll barrel leads to its inefficient use along the edges, where the thermal loads are substantially less. In addition, a lady cooler with the same hearth angle and irrigation density leads to an increased wear of the middle part of the barrel. The purpose of the invention is to reduce the flow rate of the cooler and the stabilization of the heat roll profile. The goal is achieved by the method, which includes supplying a cooler to the surface of rolling rolls with sheet mills with a flat MV1 jet at an acute angle to the roll axis, the cooler is served in the form of non-parallel flat torches with a variable step along the roll roll, and in the direction from the middle of the roll barrel to its periphery, the distance between the torch axes is gradually increased, and the angle of inclination of the torch plane to the roll axis is reduced, for example, according to the law of arithmetic progression. Such a supply of cooler to the roll surface with a simultaneous increase in the distance (pitch) between the cooler flame points in the direction from the middle to the periphery of the roll and a decrease in the torch plane to the roll axis allows a smooth change in the coolant flow rate along the roll barrel in accordance with distribution of thermal nag) narrow to roll during rolling. This achieves the stabilization of the thermal profile of the rolls during the rolling process. The diagram shows the scheme of the proposed method; ellipses indicate areas of intensive irrigation using flat-jet nozzles: S, 82, S2, ..., SM - the distance (step) between the axes of the cooler torches; о.,, ..., о / .ц are the angles of inclination of the torch plane to the roll axis. I The distance between the axes of the cooler torches and the angles of inclination of the plane of the torches to the roll axis are set by the following ratios: 5g 5 + D5 + 2L5 where L5 is the denominator of the arithmetic progression over the distance between the axes of the cooler torches; The co-denominator of the arithmetic progression of the angle of inclination of the plane of the torches to the shaft axis; n is the number of nozzles per collector. The method is carried out as follows: a given distance from the surface of the work rolls of the mill stand; on the strip inlet and exit side, cooling is performed using cooling system manifolds equipped with flat nozzles. The spacing of the nozzles on the manifold, corresponding to the distance between the axes of the cooler torches, and the angle of inclination of the plane of the torches to the roll axis are measured from the middle of the roll. The initial spacing of the nozzles (the distance between the nozzle located in the plane perpendicular to the roll axis and passage through its middle and adjacent nozzles) the initial angle of inclination of the plane of the torch and the axis of the roll are set depending on the required cooling intensity of the mill rolls in the middle part. Further, the step size of the nozzles increases, and the angles of inclination of the torch plane to the roll axis are reduced according to the law of arithmetic progression, which leads to a gradual decrease in the cooling intensity from the middle of the roll to its edge. Example. With respect to the hot rolling mill 2300, the distance from the cooling collector to the work roll was chosen to be 320 mm. The number of nozzles on the collector is 15, the initial spacing of the nozzles is 70 mm; the initial angle of inclination of the plane of the torch to the axis of the roll 65. The spacing of the nozzles is increased by 20 mm, and the angle of inclination of the flare plane of the subsequent nozzles is reduced by 5. The method is simple to implement and does not require expensive equipment. The implementation of the proposed invention will improve the efficiency of cooling by estimating the rational use (redistribution) of coolant along the roll barrel with more intensive cooling of the average, most heat-stressed, roll bomber and reduce heat removal as it approaches the edge of the roll. In addition, the total consumption of the cooler is reduced due to its more efficient use and the temperature of the work rolls is reduced and stabilized by the temeoatoo and its durability.

Claims (2)

1. USSR author's certificate N, cl. on the 21/06, 197. 2. USSR author's certificate number 71912, cl. B 21 B 27/10, 1975.