Primetals Technologies Austria Gmbh

Siemens Vai Metals Technologies Gmbh

Reinhard Karl

Alois Seilinger

Erich Opitz

Florian Poeschl

Jian Chen

Thomas Trickl

Sieglinde Ehgartner

Thomas Braidt

Sieglinder Ehgartner

Gerald Hohenbichler

Christian Lehner

Florian PÖSCHL

A handling line that includes a valve in a feed line that sets the valve to a respective opening position (s) for adjusting a coolant flow (F) to a metal strip per unit of time; an upstream condition detection device upstream of the valve device in the feed line that detects an upstream condition (ZV) of the coolant; a control unit that determines a set point (s*) for an opening position (s) of the valve device corresponding to the set point (F*) for the coolant flow (F) based on a set point (F*) for the coolant flow (F*), the upstream condition (ZV) of the coolant and a valve characteristic (C) of the valve device.

Cooling of a metal strip using a position-controlled valve device

A cooling section for flat rolling stock has a working region, through which the flat rolling stock is guided. The working region can be supplied with a liquid coolant by means of a number of spray beams. The liquid coolant is fed from a reservoir for the liquid coolant to the spray beams by means of a pump and a supply system. Valves are arranged upstream of the spray beams in the supply system. Opening positions of the valves are set by a control unit of the cooling section according to a respective sub-flow that is to be applied to the flat rolling stock by means of each spray beam. Also, the delivery rate of the pump and/or a line pressure generated by the pump in the supply system are set by the control unit according to the total flow that is to be applied to the flat rolling stock by means of all the spray beams.

Cooling section comprising power cooling and laminar cooling

To cool a metal strip (), liquid coolant () is supplied to the strip by a supply device () from a feed line (). A valve () in the feed line () sets the valve () to a respective opening position (s) for adjusting the coolant flow (F) to the metal strip () per unit of time. An upstream condition detection device () upstream of the valve device () in the feed line () detects an upstream condition (ZV) of the coolant (). A control unit () determines a set point (s*) for an opening position (s) of the valve device () corresponding to the set point (F*) for the coolant flow (F) based on a set point (F*) for the coolant flow (F*), the upstream condition (ZV) of the coolant () and a valve characteristic (C) of the valve device (). The valve characteristic (C) follows a characteristic curve (K) of the coolant flow (F) as a function of the opening position (s) of the valve device (), relative to a reference condition (ZR) of the coolant () upstream of the valve device () in the feed line (). The control unit () sets the opening position (s) of the valve device () according to the set point (s*) that has been determined.

A cooling section for flat rolling stock () has a working region (), through which the flat rolling stock () is guided. The working region () can be supplied with a liquid coolant () by means of a number of spray beams (). The liquid coolant () is fed from a reservoir () for the liquid coolant () to the spray beams () by means of a pump () and a supply system (). Valves () are arranged upstream of the spray beams () in the supply system (). Opening positions (si) of the valves () are set by a control unit () of the cooling section according to a respective sub-flow (fi) that is to be applied to the flat rolling stock () by means of each spray beam (). Also, the delivery rate (M) of the pump () and/or a line pressure (p) generated by the pump () in the supply system () are set by the control unit () according to the total flow (F) that is to be applied to the flat rolling stock () by means of all the spray beams ().

A cooling section for a flat rolled material () has a frame structure (), in which a plurality of transport rollers () for the flat rolled material () are arranged one after another transversely to a transport direction (x) and spaced apart (a). Each transport roller () mounted in the frame structure () rotates about a respective roller axis (). The roller axes () run orthogonally to the transport direction (x) and horizontally, so that the transport rollers () form a pass line () for the flat rolled material (). At least one lower spray bar () arranged beneath the pass line () has a base block () beneath the transport rollers () for a liquid coolant (). Guide sections () project upwards from the base block () into spaces between the transport rollers (). Each guide section () has an upper terminating element () on which spray nozzles () are arranged, which feed the coolant (), which had been fed into the base block (), to be sprayed onto the flat rolled material () from below. The guide sections () have a respective length () in the transport direction (x) of the flat rolled material (). That length () decreases at least in the vicinity of the respective upper terminating elements (), in the direction of the respective upper terminating element ().

Cooling section having lower spray bar

A flat rolled article () passes through a cooling device () in a transportation direction (x) at the level of a passline (). Spray bars () extend transversely with respect to the transportation direction (x). The spray bars () have, as viewed perpendicular to the transportation direction (x), in each case two outer regions () and a central region () in between. A liquid cooling medium () can be fed into the regions () via respective dedicated, individually controllable valve devices (). Flow rate profiles, pertaining to each region may be set, wherein each region () is triangular in shape. The central triangle and the two outer triangles combine to form a rectangle.

Cooling device with breadth-dependent cooling action

A device for lubricating the cylinders of a roll stand, in particular for roll nip lubrication in a roll stand for strip-shaped rolling stock. A mixture of water and oil is produced by a mixing and spraying device (). The mixture is sprayed onto at least one of the cylinders () of the roll stand and/or to the surface of the rolling stock (). The mixing and spraying device () include an arrangement of several nozzle mixer units (). Water is guided thereto by a first supply line () and oil is guided thereto by a second supply line ().

Low maintenance nozzle mixer unit for roll nip lubrication

A method for lubricating the cylinders of a roll stand, for roll nip lubrication in a roll stand for a roll band. A mixture of water and oil is produced by a mixing and spraying device, which is supplied with water by a first supply line () and is supplied with oil by a second supply line (). The mixture is sprayed to the strip and/or into the roll nip and/or to at least one of the cylinders of the roll stand. The water flowing to the mixing and spraying device () is heated by a heating device () provided in the first supply line () for a predetermined period of time set by controlling a control unit ().

Method and device for lubricating the cylinders of a roll stand

A method and a device have high energy efficiency and high descaling performance, with which high-quality rolling stock can be produced. In a method in which the rolling stock is heated in an induction furnace and subsequently descaled, before the rolling stock is rolled in a rolling stand or rolling relay, the heated rolling stock is descaled by at least one rotating water jet from a rotary descaler; then at least one temperature of the descaled rolling stock is respectively recorded by a temperature measuring instrument and delivered to a controller; and the controller determines at least one control parameter with the aid of a control rule and by taking into account a setpoint temperature, and delivers it to a control component, at least one inductor of the induction furnace being driven so that the temperature of the descaled rolling stock corresponds as far as possible to the setpoint temperature.

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Klosterneuburg, Austria

Reinhard Karl