| 摘要 |
An apparatus for the external calibration (sizing) of tubular elements such as longitudinally welded large-diameter pipes, comprises an outer support ring, a wedging mechanism connected to this ring, and a plurality of pipe-engaging calibrating elements which are closed against the external surface of the pipe as the latter is drawn through the apparatus to impart the desired external diameter thereto. According to the invention, the outer support ring forms a cylinder within which an annular piston is displaceable, the piston being formed with surfaces inclined to the axis of the pipe and acting directly or indirectly upon the pipe-engaging elements.
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