Method and device for lubricating rollers and a rolled strip of a rolling stand

Abstract

A method for lubricating rolls, especially work rolls of a rolling stand, and rolling stock passed between the rolls during the rolling operation, in which a lubricant-gas mixture, a lubricant-water-gas mixture, a lubricant-water mixture and/or a grease-medium mixture is applied to the rolls or the rolling stock on the run-in side of the rolling stand, wherein the mixture is prepared with at least one mixing device in the area upstream of the rolling stand.

We claim: 
     
         1 . A device for lubricating at least one roll and/or rolling stock rolled between rolls in a rolling stand, comprising: at least one mixing block and/or multicomponent mixing devices for mixing water, gas, and at least one lubricant to form a lubricant-gas mixture, a lubricant-water-gas mixture, or a lubricant-water mixture; and automatic control devices for determining an amount of the mixture to be sprayed by spray devices onto at least one of the rolls and/or onto the rolling stock. 
     
     
         2 . The device in accordance with  claim 1 , wherein the automatic control devices are arranged in zones over a width of the at least one roll or the rolling stock. 
     
     
         3 . The device in accordance with  claim 1 , and further comprising flowmeters and pressure controllers. 
     
     
         4 . The device in accordance with  claim 1 , wherein the multicomponent mixing devices are internal mixers or external mixers, wherein the multicomponent mixing devices comprise one of the group consisting of a turbulence plate, a venturi tube and a pipe construction. 
     
     
         5 . The device in accordance with  claim 1 , and further comprising water spray bars provided above and/or below the spray devices for spraying the lubricant-containing mixture onto at least one roll and/or onto the rolling stock. 
     
     
         6 . The device in accordance with  claim 1 , and further comprising walls arranged to laterally shield a lubricant-air mist produced by the spray devices, and further comprising an exhaust system for the mist, wherein the walls are inwardly swivelable toward the rolls or the rolling stock. 
     
     
         7 . The device in accordance with  claim 1 , and further comprising an automatic control device for controlling flatness of the rolled strip by evaluating signals of a flatness measuring device, wherein the flatness measuring device comprises a measuring roller or contactless measuring device, which generates signals that correspond to the flatness of the rolled strip, the flatness measuring device being operative to relay the signals to the spray devices for adjusting amounts or concentrations of the at least one lubricant. 
     
     
         8 . The device in accordance with  claim 1 , wherein the spray devices are arranged in two rows substantially parallel to an axis of the work roll. 
     
     
         9 . The device in accordance with  claim 8 , wherein the rows are offset from each other. 
     
     
         10 . The device in accordance with  claim 1 , wherein the spray devices are arranged in a single row, and have nozzles with a large angle of spray so that adjacent jets provide double coverage. 
     
     
         11 . The device in accordance with  claim 1 , wherein the mixing devices are atomizing nozzles. 
     
     
         12 . The device in accordance with  claim 1 , wherein the lubricant is oil. 
     
     
         13 . The device in accordance with  claim 1 , wherein the automatic control devices are control valves. 
     
     
         14 . A rolling stand, comprising a device according to  claim 1 , wherein the spray devices have nozzle spray bars designed to swivel, so that a distance between a nozzle orifice and the roll or rolling stock can be adjusted to be minimal or optimal.