Method and device for roll-forming workpieces
AssigneeRepkon Machine and Tool Industry and Trade Inc.
InventorKarl-Heinz Köstermeier
Life of this patent
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Abstract
A method for producing workpieces wherein a substantially rotationally symmetrical workpiece (4, 9, 33), which has a workpiece axis (22), is tentered concentrically relative to an inner mandrel (3, 16) provided inside the workpiece (4, 9, 33), and is reshaped by a process of flow forming by radially applying external reshaping rollers (7). The wall thickness of the workpiece (4) is also reduced in at least some regions. The inner diameter (18, 41) of the workpiece (33) is enlarged by applying inner reshaping rollers (11) of an inner reshaping unit. The inner reshaping rollers (11) are arranged such that the roller axes of rotation and the enveloping cone (20) all intersect at one point on the workpiece axis (22).
Claims8
A method of reshaping a workpiece in which an essentially rotation-symmetrical workpiece (4, 9, 33) having a workpiece axis (22) is tensioned concentrically by means of an inner mandrel (3, 16) provided within the workpiece (4, 9, 33) and is reshaped by means of pressure cylinders by radial pressure from outer reshaping rollers (7), whereby the wall thickness of the workpiece (4) is reduced at least in sections,
- wherein the inner diameter (18, 41) of the workpiece (33) is expanded by means of contact pressure from inner reshaping rollers (11) of an interior-shaping unit, whereby the inner reshaping rollers (11) are shaped such that each of an enveloping surface of a running surface defines a shell truncated cone (20), and wherein a tip of each shell truncated cone lies on a rotational axis of the inner reshaping rollers (11), whereby the inner reshaping rollers (11) are furthermore mounted such that their roller rotational axes and the shell truncated cones (20) all intersect at a point (21) along the workpiece axis (22), whereby the inner mandrel (3, 16) and the workpiece (4, 9, 33) are all rotationally driven about the workpiece axis (22) or the inner and/or outer reshaping rollers are rotationally driven, whereby an outer diameter of the workpiece (33) is reduced by contact pressure from the outer reshaping rollers (24) of the exterior-shaping unit, whereby the outer reshaping rollers (24) are shaped such that each shell surface of a running surface defines a truncated-cone shell (31) on the rotational axes (34) of the outer reshaping rollers (24), and wherein tips (35) of each truncated-cone shell (31) lie on the rotational axes (34) of the outer reshaping rollers (24), whereby the outer reshaping rollers (24) are further mounted such that their roller rotational axes (34) and the shell cone (31) all intersect at a single point (35) along the workpiece axis (22).
A device to reshape a workpiece, said device having an inner mandrel (3, 16) about which an essentially rotation-symmetrical workpiece (4, 9, 33) with a workpiece axis (22) may be mounted concentrically, with an exterior-shaping unit with outer reshaping rollers (7) that are configured to reshape the workpiece by means of radial contact pressure by outer reshaping rollers (7) with at least partial reduction of the wall thickness of the workpiece (4, 9, 33), characterized in that an interior-shaping unit with inner reshaping rollers (11) is provided to expand the inner diameter (18, 41) of the workpiece (33), whereby the inner reshaping rollers (11) are shaped such that each enveloping surface of one or more running surfaces defines a truncated-cone shell, and wherein a tip of each truncated cone shell lies on a rotational axes of the inner reshaping rollers whereby the inner reshaping rollers (11) are furthermore mounted such that their roller rotational axes and the truncated cone shell (20) all intersect at a single point (21) along a workpiece axis (22) whereby the inner mandrel (3, 16) along with the workpiece (4, 9, 33) may be driven about the workpiece axis (22) or the inner and/or outer reshaping rollers, and/or that the outer reshaping rollers (24) are shaped such that each of the shell cones of their running surfaces define a truncated-cone shell, and the tips of each truncated cone shell (31) lie on the rotational axes (34) of the outer reshaping rollers (24), whereby the outer reshaping rollers (24) are furthermore mounted such that their roller rotational axes (34) and the truncated shell cones (31) all intersect at a single point (35) along the workpiece axis (22).
Dependencies are inferred from the claim text.