Kocks Technik Gmbh & Co.

Hans-Dieter Gerhards

Hermann Moltner

Hans Brauer

Werner Demny

Herrmann Moltner

A rolling line for rolling tubular or rod-shaped material, in particular of reducing tubes, has a plurality of rolling stands disposed closely one after the other, as well as measuring rolls disposed upstream of and/or beyond the rolling stands and rolling on the material. In order to keep the distance between the measuring rolls and the first or last rolling stands as small as possible whatever the number of rolling stands used, and hence to ensure the longest possible use of the measuring rolls, said measuring rolls are disposed in measuring roll stands which fit into the reception pockets of the rolling stands which, like said rolling stands, can be displaced and disposed in or against the direction of rolling.

Rolling line with measuring means

The invention concerns a tube release roll mill with four or more driven rolls, which in pairs form a pass opening. The diagonally positioned identically constructed rolls have an enlarged working surface width. A certain roll pair spacing is also provided, as well as an enlarged angle of attack of the rolls, which together result in the wall thickness of the tube bloom being more uniform, the development of fewer surface defects, and a quieter operation of the roll mill.

Tube release rolling mills

In a method of rolling tubes in a stretch-reducing rolling mill having a group drive in which the elongation, and therefore the tension is increased by increasing the speed of an auxiliary drive motor relative to that of a main drive motor, the length of the trailing 'thickened end', which must be rejected as scrap, is reduced by increasing the elongation from the point in time at which the start of the trailing end portion of the tube reaches the last stand. This trailing end portion is that portion which receives a larger wall thickness than the central portion of the tube as a result of the reduced tension exerted in the trailing end portion of prior art practices. The start of this trailing end portion can be predicted from experience or by rolling a sample tube without subjecting its trailing end portion to the said increased elongation and measuring the wall thickness at the trailing end portion of the sample tube.

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Monheim, Germany

Hans-Dieter Gerhards