Cutting of metals by shearing
AssigneeTI (Group Services) Limited
InventorsRichard Quentin Carmichael, Roger George Bonelle
Life of this patent
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Abstract
In tube-shearing apparatus of the kind employing relatively transversely moving apertured dies and an internal supporting mandrel, the mandrel comprises an elastomeric body which is compressed axially with the high force to expand it radially against the tube wall such as to form not merely an internal support but effectively a supporting shear blade inside the tube. This allows clean shearing also of tubes having internal protuberances such as welding seams.
Claims7
In apparatus for shearing a tubular workpiece in a plane transverse to its axis, and including a pair of apertured dies through which the workpiece passes, one of the dies being movable relative to the other in a direction transverse to the axis of the workpiece to cause the shearing action and a mandrel including a radially expansible component for supporting the inside of the workpiece in the shearing plane wherein said radially expansible component comprises at least one deformable elastomeric body in the shearing plane and means for compressing that body axially to cause it to expand radially and press against the inside of the workpiece so as effectively to form a shear blade within the workpiece which cooperates with the dies during shearing action.
Dependencies are inferred from the claim text.