چكيده لاتين :
Thin-walled tube bending has found many its applications in the automobile
and aerospace industries. This process may produce a wrinkling, bulking
and tearing phenomenon if the process parameters are inappropriate, especially
for tubes with large diameters and thin wall thicknesses. Push bending process
is one of the methods used for bending tubular parts. It is a suitable technique to
make considerably small bending radii. The method is perjormed using a rigid
die to guide and form the tube into the required shape while the tube is pushed by
a punch. A pressure media is used inside the tube to prevent its wrinkling and
buckling. Hyper-elastic (rubber) materials are commonly used as the pressure
media. This paper presents the pressure distribution within the tube, before and
during the push bending process. Theoretical result of pressure distributions is
compared with the finite element simulations. Effects of rubber properties on the
tube quality are also studied. Finally optimum working conditions of process is
predicted by the finite element method and is compared with previously published
experimental observations.
