Tube drawing method and device
AssigneeGKN Automotive AG
InventorsUlrich Brochheuser, Horst Statezni
Life of this patent
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Abstract
A method of elongating a tube (10) by way of a drawing ring (13), wherein, when elongating the tube (10), tensile forces are applied to an elongated tube portion (22) which has already passed through the effective drawing ring cross-section and that pressure forces are applied to a tube blank portion (11) which has not yet passed through the effective drawing ring cross-section, wherein the tensile forces are applied by a mandrel (16) which is positioned in the tube and which is connected to a front tube end in a form-fitting or force-locking way.
Claims19
A method of elongating a tube with a drawing ring, the tube having a first end , a blank portion and a rear end, the method comprising the steps of:
- passing the tube through an effective drawing ring cross section, starting with the first end;
- applying tensile forces to an elongated tube portion having passed through the effective drawing ring cross section and applying pressure forces to a tube blank portion which has not yet passed through the effective drawing ring cross-section,
- wherein the tensile forces are applied by a mandrel which is positioned in the tube and which is connected to the front end in a formfitting or force-locking way.
An apparatus for elongating a tube by way of a drawing ring comprising:
- a mandrel having an outer diameter corresponding approximately to an inner diameter of the tube;
- a drawing ring having an inner diameter smaller than an outer diameter of the tube and greater than an outer diameter of the mandrel;
- and
- a sleeve which is guided co-axially on the mandrel, wherein the mandrel is adapted to be advanced at a greater speed than the sleeve.
A method of elongating a tube with a drawing ring, the tube having a first end portion and blank portion, the method comprising the steps of:
- passing the first end portion of the tube through an effective drawing ring cross section;
- thereafter, applying tensile forces for elongating the tube through the drawing ring to form an elongated tube portion;
- and
- applying pressure forces to the tube blank portion which has not yet passed through the effective drawing ring cross-section, wherein the tensile forces are applied by a mandrel which is positioned in the tube and which is connected to the front end portion in a form-fitting or force-locking way.
Dependencies are inferred from the claim text.