Sms Group Gmbh

Mannesmann Aktiengesellschaft

Sms Meer Gmbh

Peter Thieven

Torsten Müller

Winfried Braun

Norbert Theelen

Alexander Gohr

Hans-Joachim Pehle

Matthias Krahn

Hans Joachim Pehle

Hubert Strank

Stefan Ernst

Waldemar Vogel

Helge Daehndel

Thomas Leisten

Susanne Zeller

Helge Dähndel

Cooling device () for cooling a seamless, rolled pipe (R) made of a metal, preferably steel, which has a nozzle assembly () comprising one or more nozzles (), which are configured to apply a cooling medium (K), preferably water or a water mixture, to the outer circumferential surface of the pipe (R) while the pipe (R) is transported along a conveying direction (F) through a cooling section of the cooling device (), wherein the nozzle assembly () has an access (Z), via which the pipe (R) can be removed from the cooling section in the radial direction of the pipe (R), preferably upward.

Cooling device for seamless steel pipes

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 invention relates to a device and a method for producing a pipe () from a hollow block () which has an opening (). The device has a rolling mill () for rolling the hollow block () via a rolling rod () introduced into the opening () of the hollow block (), whereby the pipe () is produced. A retaining device () for retaining the pipe () is provided behind the rolling mill (), and the device is further designed such that the rolling rod () can be drawn out of the pipe () after the rolling process while the pipe () is retained by the retaining device ().

Method and apparatus for making seamless pipe

In order to optimize the lubrication of a rolling rod in a process for hot-rolling metallic, elongate hollow bodies () by means of the rolling rod (), which is arranged in the hollow body and to which lubricant is applied before the hot-rolling operation, the lubricant is applied to the rolling rod in solid form.

Process for hot-rolling metallic hollow bodies and corresponding hot-rolling mill

The invention relates to a method for producing a tube () or tubular pre-product from a solid billet in a rolling mill, comprising at least one roll () acting from the outside on the solid billet or tubular pre-product and a mandrel () carrying a piercing head () and engaging from the inside in the tube or tubular pre-product, wherein immediately after the solid billet has been completely pierced by the piercing head a fluidized deoxidation agent and/or an inert gas is supplied to the end of the tube or tubular pre-product facing the roll and is guided through the tube or tubular pre-product into the interior of the tube or tubular pre-product when the mandrel is withdrawn. The invention further relates to a rolling mill for performing the method according to the invention, comprising at least one roll acting from the outside onto the solid billet or tubular pre-product and a mandrel carrying a piercing head and engaging from the inside in the tube or tubular pre-product, wherein a device is provided for feeding and introducing a fluidized deoxidation agent and/or an inert gas to the end of the tube or tubular pre-product facing the at least one roll.

Deoxidation of cross-rolled hollow blocks

Caliber contour in a rolling mill roller for tubes

A roll pass of a roll set having three rolls for a multi-stand mandrel-free stretch reducing mill has a roll pass shape that deviates from the circular. A tube is passed in its longitudinal direction through the non-circular roll pass shape enabling modification of a shape of a cross-section of the tube, so as to counteract the non-circular external diameter deviations of the tube. A final roll pass (finishing pass) of the stretch reducing mill is locally enlarged at peripheral points where the tube diameter of the entering tube would otherwise deviate downward from a target size and locally reduced in size at the peripheral points where the tube diameter would otherwise deviate upward from the target size.

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Aachen, Germany

Peter Thieven