Finish sizing of thick walled steel tubes - by internal expansion of plastic sleeve with high pressure oil

A machine for the sizing of thick walled tubes of high tensile steel has a mandrel (3) fixed to the machine frame. A bush (4) mounted on the mandrel carries a sleeve (6) made of a plastic with a high elastic modulus. This sleeve is retained axially by a ring (11) which abuts against the shoulder (12...

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Bibliographische Detailangaben
1. Verfasser:	POHLER,CARL-LUDWIG
Format:	Patent
Sprache:	eng ; ger
Schlagworte:	AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKINGWITHOUT ESSENTIALLY REMOVING MATERIAL MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES,OTHERWISE THAN BY ROLLING MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVINGMATERIAL PERFORMING OPERATIONS PUNCHING METAL TRANSPORTING WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS ORPROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL
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Beschreibung
Zusammenfassung:	A machine for the sizing of thick walled tubes of high tensile steel has a mandrel (3) fixed to the machine frame. A bush (4) mounted on the mandrel carries a sleeve (6) made of a plastic with a high elastic modulus. This sleeve is retained axially by a ring (11) which abuts against the shoulder (12) of the mandrel (3). High pressure oil is applied to the annulus (7) between bush (4) and sleeve (6). This pressure expands the sleeve radially and presses a ring of segments (15) (16) against the wall of the tube (23) which is, in turn, expanded. This expansion is limited by the outer sleeve (24).