Abstract:
Metal forming can be defined as a process in which the desired size and shapes
are obtained through plastic deformation of a material without any significance
loss of material. Bending is a metal forming process in which straight length
is transformed into a curved length. Roller forming is a continuous bending
operation in which a long strip of metal is passed through consecutive sets of
rollers, until the desired cross sectional profile is obtained. The roller bending
process usually produces larger parts of cylindrical or conical cross sections in
large quantity. This project is to design and construct a portable roller bending
machine. This machine is used to bend metal strips into curve and the other
curvature shapes. The size of machine is very convenient for portable work. It
is fully made by steel. Moreover, it is easy to be transported and use at any
time and any place. It reduces human effort and also required less skill to
operate this machine. We are designing manually operated roller bending
machine with use of rollers, chain sprockets and support (frame). The roller
bending machine is manually operated. Therefore, our objective is to increase
accuracy at low prize without affecting the bending productivity. This machine
works on simple kinematic system instead of complicated design. Due to its
portability it can be used by small workshop or fabrication shop. In the three
roller bending machine, the three rollers rotate. Bending can be done in both
sheet metal and bars of metal. For designing a three roller bending machine, it
is required to calculate the exact force for bending. Based on this force, the
machine parameters and motor power are decided. Various factors that should
be considered while calculating this force are material properties, width, and
thickness, number of passes, bending radius, force developing mechanism and
link.
