SU632420A1 - Method of cooling roll passes - Google Patents

Description

I

The invention relates to ferrous metallurgy, namely to the production of rolled metal; it can be used on small- and medium-sized hot rolling stations, mainly in the production of periodic profiles.

A known method of cooling the rolls, which is to supply coolant tangentially to the surface of the rolls on the output side of the rolled stock from the deformation zone against the rotation of the rolls.

There is also known a method of cooled rolls, which concludes that coolant under pressure of 20- at atm and a flow rate of 0.5-2, l / mm of the surface of the gauges is supplied from the output of the rolled stock from the rolls to the contact zone with the rolls.

A disadvantage of the known methods is the impossibility of eliminating the non-uniformity of wear of individual elements of the roll calibers during the production of periodic profiles.

The surface of these rolls is represented by two well-defined elements, namely, uniformly alternating depressions and convexities, forming the profile of KA2

libra. The conditions of wear of these elements are not oiifiPanova and depend on a number of reasons: the ratio of sliding speeds, magnitudes fj uds-flax.x, etc. To implement known methods, it is impossible to eliminate the unevenness of wear of individual roll caliber gauges. Cooling by these methods leads to even more pronounced non-identical operating conditions of individual elements of the surface roll gauges. While the convex areas of the caliber are intensively cooled with water, the depressions are cooled predominantly due to thermal conductivity, i.e. due to the return of heat to the colder neighbor of the convexes. In addition, the presence of coolant zones that occur in

The 5 convexity forming on the surface periodic profiles creates additional difficulties in cooling these areas.

The purpose of the image: the shadow is to ensure uniform cooling of all elements of the caliber of the rolls and, ultimately, increase their durability.

The goal is achieved by the fact that the cooler is fed in a spiral opposite to the arrangement of periodically alternating depressions and protrusions on the surface of the gauges.

The essence of the proposed method consists in the following.

A stream of liquid is supplied to the contact area of the rolling stock with the surface of the rolls on the exit side of the deformation zone, and it is directed along a spiral trajectory opposite to the location of periodically alternating depressions and protuberances formed on the surface of the rolled section. The jet is screwed into the spiral labyrinth created by depressions and bulges on the surface of the caliber, and ensures their uniform and intensive cooling.

In the rolling process, the microvolumes of roll gauges are heated, being found in contact with the car, to a temperature in excess of 650 ° C. The supply of a cooler to the zone of metal contact with gauges of the rolls along a spiral trajectory allows for a very short time to reduce the surface temperature of all elements of the second perimeter of the cross section of the roll bar to a value below 400-200 ° C and thereby significantly increase the hardness of the phase components of the roller material.

Claims (1)

Invention Formula A method for cooling gauges of rolls having hollows and protrusions, including the supply of a cooler to the zone of contact of the metal with the rolls from its exit from the deformation zone, characterized in that, in order to ensure uniform cooling of all elements of the gauge, the cooler is fed in a spiral opposite direction to the arrangement of periodically alternating valleys and protrusions on the surface of the caliber.