3 Fundamentals of press design

Methods of forming and cutting technology
Swivel bending is bending using a tool which forms the part around
the bending edge (Fig. 2.1.24). Circular bending is a continuous process
of bending which progresses in the direction of the shank using strip,
profile, rod, wire or tubes (Fig. 2.1.25). Circular bending at an angle
greater than 360°, for example is used in the production of springs and
is called coiling.
Forming under shear conditions
Displacement is a method of forming whereby adjacent cross-sections of
the workpiece are displaced parallel to each other in the forming zone
by a linear die movement (Fig. 2.1.26). Displacement along a closed die
edge can be used for example for the manufacture of welding bosses
and centering indentations in sheet metal components.
Fig. 2.1.22 Roll straightening
workpiece
rollers
Metal Forming Handbook / Schuler (c) Springer-Verlag Berlin Heidelberg 1998
Fig. 2.1.21 Roll bending
straightening rollers
workpiece
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