Sms Group Gmbh

Alexander Gohr

Peter Thieven

A stretch reducing rolling mill for rolling pipes has a plurality of roll stands arranged in series in a conveying direction of a pipe. A wall thickness measuring device determines a wall thickness progression of the pipe prior to rolling. A control unit controls respective rotational speeds of the roll stands. A pipe position measuring device is arranged in front of the roll stands and continuously measures a current longitudinal coordinate of the pipe. The measured values of the longitudinal coordinate of the pipe are transmitted to the control unit. The control unit controls the rotational speeds of the roll stands based on both the determined wall thickness progression and the transmitted measured values of the current longitudinal coordinate of the pipe, in order to compensate for wall thickness variations of the pipe. A stretch reducing rolling mill is designed to carry out the method.

Method and device for controlling a stretch reducing rolling mill for wall thickness compensation

A controller () and method for controlling a stretch-reducing mill () for rolling tubes are presented. The stretch-reducing mill () has several roll stands () arranged behind one another in a conveying direction (F) of the tubes (R) and at least one outlet-side wall thickness measuring device (). The controller () is set up to receive measurement data from the wall thickness measuring device () which identifies one or more outlet-side wall thicknesses (s) of a tube (R) exiting from the last roll stand () and one or more of the received measurement data wall thickness on the inlet-side (s), preferably to determine an inlet-side wall thickness profile of the tube (R) before entering the first roll stand (), and preferably to calculate and control one or more of the roll stands (), taking into account the determined inlet-side wall thicknesses (s).

Wall thickness monitoring while stretch-reducing tubes

The disclosure relates to a method for controlling a stretch-reducing mill. Tube ends of stretched tubes are optimized by controlling one or more motors of the stretch-reducing mill. The method includes at least one outlet-side wall thickness measurement and an automatic adjustment of the value of a speed change of the motors to the tube wall thickness profile. The progression of the speed changes over time of individual or all motors is also automatically adjusted on the basis of the tube wall thickness measured values.

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Mönchengladbach, Germany

Alexander Gohr