Patent ID: 6427513
Filing Date: 2002-08-06
Classification: B21C

Abstract:
An apparatus for producing a pipe having a first end and a second end comprising:an expandable expander device insertable into the first end of the pipe being produced and being selectively switchable between a closed state and an open state; an expander rod connected to said expandable expander device for incrementally moving said expander device into the pipe; a clamping device for clamping the pipe at a smallest possible distance spaced from and in front of said expander device; and a gripper car having a gripping device for raising and lowering and rotating the second end of the pipe, wherein said gripper car is operatively arranged for flexibly deforming the free second end of the pipe causing a prestress of the pipe when the pipe is clamped by said clamping device, and wherein said expander device is operatively arranged for decreasing said prestress of the pipe by switching from the closed state to the expanded state for incrementally calibrating the pipe for roundness and straightening the pipe, wherein said gripping device comprises two mechanically adjustable spindles for pre-positioning and two piston cylinder units for vertical and rotational movement of the second end.