Mannesmann Aktiengesellschaft

Manfred Peglau

Paul Koenen

Norbert Theelen

Walter Hoffgen

A device for guiding a rotating hollow blank emerging from a cross-rolling mill, especially an Assel mill, which device includes at least two tubular guide rollers that extend over the length of the hollow blank and are arranged next to each other below the delivery plane and parallel to the delivery direction of the hollow blank. The guide rollers are supported by support rollers arranged below the guide rollers. The speed of the guide rollers and the support rollers is synchronized with the delivery speed of the hollow blank. The guide rollers are adjustably mounted on inclined guide blocks. A plurality of upper guide rollers are pivotably mounted so as to be able to contact the outer surface of the hollow blank. Disk type rollers are arranged between the guide rollers to lift the hollow blank away from the guide rollers for ejection from the cross-rolling mill.

Device for guiding a hollow blank

Pre-reduction equipment for guiding a pipe blank and reducing its end before it enters an 'Assel' rolling mill, which is disposed immediately downstream from the pre-reduction equipment and consists of several freely rotatable rollers, which are disposed uniformly distributed about the pipe blank and can be set concentrically against the pipe blank and the setting motion of which can be controlled as a function of the determined position of the pipe blank. In order to make it reliably possible to initially roll particularly short pipe blanks with simple means, it is proposed that, for the initial rolling of short pipe blanks, the blanks are introduced into the 'Assel' rolling mill by moving the pre-reduction equipment with the rollers clamping the pipe blank and, during the initial rolling in the 'Assel' rolling mill, can be rotatably guided in lunette fashion by the rollers of the pre-reduction equipment.

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Duisburg, Germany

Manfred Peglau