Method and device for stretch-flow forming
AssigneeLeifeld Metal Spinning AG
InventorBenedikt Nillies
Life of this patent
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Abstract
A method for stretch-flow forming, in which a tubular workpiece is arranged around a spinning mandrel, set into rotation and formed by advancing at least one forming roller. A wall thickness of the tubular workpiece is reduced and the tubular workpiece is lengthened, as spinning mandrel use is made of a universal spinning mandrel with different external diameters in the axial direction for producing cylindrical and/or conical and/or cambered hollow parts of different design. during forming the forming roller and the spinning mandrel are moved relatively in the axial direction with respect to the workpiece, and, for the purpose of designing varying diameters and/or wall thicknesses of the workpiece, the forming roller is moved relatively in the axial direction with respect to the spinning mandrel.
Claims12
Method for stretch-flow forming, in which a tubular workpiece is arranged around a spinning mandrel with an axis defining an axial direction, and a radial direction perpendicular to the axial direction, set into rotation about the axial direction and formed by advancing at least one forming roller, the method comprising:
- clamping the workpiece radially, at one end, on a clamping chuck which is rotatably supported on a headstock and driven in a rotating manner by a rotary drive in the headstock,
- rotating the tubular workpiece to reduce a wall thickness of the tubular workpiece and lengthen the tubular workpiece,
- wherein the spinning mandrel includes different external diameters in the axial direction,
- spinning the spinning mandrel to produce cylindrical and/or conical and/or cambered hollow parts of different design,
- moving the at least one forming roller and the spinning mandrel relatively in the axial direction with respect to the workpiece during the forming, and, for the purpose of designing varying diameters and/or wall thicknesses of the workpiece, moving the forming roller relatively in the axial and the radial direction with respect to the spinning mandrel, and
- wherein the spinning mandrel is axially moveably supported on the headstock and moved axially during rotation of the workpiece and forming with respect to the clamping chuck and the headstock.
Device for stretch-flow forming a tubular workpiece, the device comprising:
- a spinning mandrel, which can be arranged in the tubular workpiece, at least one forming roller for advancing towards and forming the workpiece and a rotary drive for driving the workpiece in a rotating manner, wherein
- the spinning mandrel has different external diameters in the axial direction,
- during forming the forming roller and the spinning mandrel are supported in a movable manner relatively in the axial and radial direction with respect to the workpiece, and, for the purpose of designing varying diameters and/or wall thicknesses of the workpiece, the forming roller is arranged in a movable manner relatively in the axial direction with respect to the spinning mandrel,
- a clamping chuck adapted to radially clamp one end of the workpiece and rotatably supported on a headstock the clamping chuck driven in a rotating manner by a rotary drive in the headstock, and
- the spinning mandrel is axially moveably supported on the headstock and is supported in an axially movable manner with respect to the clamping chuck and the headstock.
Dependencies are inferred from the claim text.