Method and device for forging a workpiece in bar form
AssigneeGFM GmbH
InventorRobert KOPPENSTEINER
Life of this patent
Estimating the term…
Abstract
A description is given of a method and a device for forging a rod-shaped workpiece (5) which is deformed with the aid of forging tools (1, 2, 3, 4) in the sense of a cross-sectional displacement perpendicular to the forging axis (a) and is subjected to an axial advancement and possibly a rotation about the forging axis (a) during the pauses in the engagement of the forging tools (1, 2, 3, 4). In order to achieve an advantageous grain refinement, it is proposed that the workpiece (5) is deformed in the sense of the cross-sectional displacement perpendicular to the forging axis (a) in a bending zone (13) between two central supports (11) by means of the forging tools (1, 2, 3, 4) acting on the workpiece (5) radially in relation to the forging axis (a).
Claims8
1-8. (canceled)
9:
- A method for forging a rod-shaped workpiece (5) which is deformed, with the aid of forging tools (1, 2, 3, 4) arranged in pairs opposite one another, in the sense of a cross-sectional displacement perpendicular to the forging axis (a) and is subjected to an axial advancement and possibly a rotation about the forging axis (a) during the pauses in the engagement of the forging tools (1, 2, 3, 4), wherein the workpiece (5) is bent out of a position coaxial to the forging axis (a) and is bent back into the forging axis (a) in the sense of the cross-sectional displacement perpendicular to the forging axis (a) in a bending zone (13) between two central supports (11) by means of the forging tools (1, 2, 3, 4) acting on the workpiece (5) radially in relation to the forging axis (a).
10:
- The method according to claim 9, wherein the workpiece (5) is subjected to a forging reduction in front of the bending zone (13) in the advancement direction (7).
11:
- The method according to claim 9, wherein the workpiece (5) is subjected to a cross-sectional reduction and/or a finishing operation after the bending zone (13) in the advancement direction (7).
12:
- The method according to claim 10, wherein the workpiece (5) is supported centrally for the bending deformation during the reduction forging and/or during the finishing.
13:
- A device for carrying out a method for forging a workpiece (5) according to claim 9, having forging tools (1, 2, 3, 4) which are arranged in pairs opposite one another in relation to the forging axis (a), wherein the forging tools (1, 2, 3, 4) have molding surfaces (9) which are provided between inlet-side and outlet-side molding surfaces (6, 8) for a mold cross-section that is coaxial to the forging axis (a) and form a mold cross-section that is eccentric in relation to the forging axis (a) in such a way that the workpiece (5), between the central supports (11), is bent out of a position coaxial to the forging axis (a) and is bent back into the forging axis (a).
14:
- The device according to claim 13, wherein the inlet-side molding surfaces (6) form a mold cavity that tapers in the advancement direction (7).
15:
- The device according to claim 13, wherein the outlet-side molding surfaces (8) form a mold cavity that tapers in the advancement direction (7) and/or a finishing tool.