Mannesmann Aktiengesellschaft

Peter Jollet

Dieter Figge

Herbert Quambusch

Werner Kircher

Helmut Pecnik

The invention relates to a process for producing thin hot-rolled steel strip with a final thickness of &lt;1 mm from strip-cast feedstock in sequential steps, including surface descaling a cast feedstock, rolling the feedstock in six passes in a tandem Steckel roll line, coiling and uncoiling the feedstock after its first and second passage through the tandem Steckel roll line in furnaces arranged on the entry and exit sides of the tandem Steckel roll line. After a third passage through the Steckel roll line, the feedstock is coiled up in an exit-side coiling device having two furnaces one atop the other, which serves as a storage device for the roughed strip. Simultaneously with the coiling of the first strip, a second strip is uncoiled from the storage device. The cropped front end of the second strip is welded to the cropped rear end of the already uncoiled roughed strip. After passing through a second roughed strip storage device, the roughed strip that has been welded into an endless strip is fed to the finishing train, where it is reduced to the desired finished strip thickness.

Process for producing thin-hot rolled strip

A process for regrinding the rolls installed in hot-strip roll stands using rotating pot-shaped grinding tools which are movable in an oscillating manner parallel to the roll axis. The grinding tool is fastened to the end of a grinding shaft which is driven in rotation so as to be axially displaceable transversely to the roll, guided coaxially in a grinding sleeve and connected at its opposite end with a displacing drive supported directly at the housing. The contact pressing force of the grinding tools at the roll is applied by compressed air which is supplied to the displacing drives. The air pressure, which is preset corresponding to the desired contact pressing force, is changed within a narrow range until the torques of all grinding tools or of one of the grinding tools measured at the drive motors for the grinding tools which are driven in rotation are identical and constant.

Process and device for regrinding rolls installed in hot-strip roll

An apparatus for coiling strip, in particular, continuously cast thin slabs, which after leaving the continuous caster are wound into a coil in a furnace at a casting speed, and are payed out of this furnace at a rolling speed, whereby preferably two furnaces are preferably located one above the other for alternating coiling and payout. To improve an apparatus of the type described above for the coiling of strip which has only small thermal losses in a largely closed furnace, and has the smallest possible number of moving parts inside the furnace to achieve a high degree of operational safety and reliability. The invention proposes that each furnace has a threading opening for the strip which is largely closed by a pair of pinch rolls, and together with the pair of pinch rolls, can be pivoted around its horizontal axis, which corresponds to the coiling axis, from the coiling position into the payout position.

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Dusseldorf, Germany

Peter Jollet