Set-up of the rolls of a skew rolling mill

The invention concerns set-up of the rolls of a skew rolling mill, in particular, an Assel mill for production of pipes out of pre-pierced hollow blanks on a mandrel by means of at least three rolls. Such rolls are separated from one another by a circumferential angle of 120 deg., incline at a sprea...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser:	HAEUSLER, KARL HEINZ, 41352 KORSCHENBROICH, DE, PIETSCH, JUERGEN.., 41061 MOENCHENGLADBACH, DE, WENGENROTH, KARL-HELMUT, 52072 AACHEN, DE, ARNAUTU, GHEORGHE., 40472 DUESSELDORF, DE, VOSWINCKEL, GUNTHER., 41179 MOENCHENGLADBACH, DE
Format:	Patent
Sprache:	eng ; ger
Schlagworte:	MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVINGMATERIAL PERFORMING OPERATIONS PUNCHING METAL ROLLING OF METAL TRANSPORTING
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Beschreibung
Zusammenfassung:	The invention concerns set-up of the rolls of a skew rolling mill, in particular, an Assel mill for production of pipes out of pre-pierced hollow blanks on a mandrel by means of at least three rolls. Such rolls are separated from one another by a circumferential angle of 120 deg., incline at a spreader angle towards the rolling axis, and are additionally pivoted through a transport angle ( alpha ) relative to this axis. Each roll consists of a run-in cone (2), a shoulder (3), a smoothing section (4) and a rounding cone (5). Roll set-up is characterised by combination of the following features; a) the pivot axis of each roll for forming the transport angle ( alpha ) cuts the axis of the blank at a right angle, and passes through the middle of the smoothing section (4); b) the section (4) has a concave shape corresponding to the local pipe diameter; c) the length of the section (4) is chosen so that the overlap of three rolls varies from 115 to 150%; d) the transport angle ( alpha ) varies from 7 to 15 deg., and preferably is 10 deg.