Bending block for a bending device
AssigneeThyssen Krupp Stahl AG
InventorsThomas Flehmig, Uwe Kneiphoff, Klaus Blümel, Klaus Göhler
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Abstract
The invention relates to a bending mandrel for a bending device and also to a bending method for pipes, more particularly pipes which have a large diameter-to-wall thickness ratio and are to be bent by a small radius, for example, of the order of magnitude of the pipe diameter. To this end use is made of a bending mandrel (5, 6) to whose rigid head (5) assembly (6) of springy sheet metal lamellae (6a, 6b) is attached to improve the bendability of the bending mandrel (5, 6) while maintaining a satisfactory supporting action, the lamellae (6a), with the exception of the outer lamellae (6b), having window-like cutaway portions (6c).
Claims11
A bending mandrel for a bending device for a pipe, said bending mandrel comprising:
- a rigid head;
- and
- an assembly of flexible lamellae made of sheet metal, said assembly of flexible lamellae having an attached end attached to the rigid head and an unattached end, the flexible lamellae in the assembly being arranged one above the other, said lamellae being bendable towards one another perpendicularly to the plane of the lamellae, and being capable of sliding relative to one another,
- wherein the assembly of flexible lamellae includes inner and outer lamellae, wherein each of the inner lamellae includes a central window-like cutaway portion extending longitudinally of the assembly which collectively define a longitudinally extending hollow zone of the assembly.
Dependencies are inferred from the claim text.