Bending Process

Manufacturing Technology , Bending Process .
Tackles mainly about the definition of Bending process, how does it work, the machines & equipment used to make it work and the application of Bending on manufacturing Industries.

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1. BENDING

2. BENDING???

4. BENDING
Is the deformation of material about a
straight axis. There is little or no change in
surface area of the work piece. Material on
the outside of the bend tends to be
stretched and material on the inside tends to
be compressed. Bending is a very common
sheet metal operation.

5. RAM AND PRESSING BENDING
Is a method applicable to tubing, bar, and other sections, and is
illustrated in Figure 2H2c. A forming block is attached to the ram of a
hydraulic press. Wing dies below the ram hold the tubing and pivot to
wrap it around the forming block as press ram descends. A wiping action
of the wing dies controls the flow of metal and provides a compression
bend.
No mandrel is used. There is less control over the work piece than that
provided by draw or compression bending, but the operation is relatively
rapid. Bends to 165 degrees can be made. Automotive exhaust pipes and
other tubing components used in large quantities are commonly bent by
this method.

7. STRETCH BENDING
The work piece is stretched longitudinally to the yield point and
then is wrapped around a bending die or form. A mandrel is not
needed, but the method is not rapid. It is applicable to bends of
non-uniform radius.
One common application of the process is the bending of
structural members made from angle or channel sections when
such members require a curved shape. The frame of rockets and
other aerospace vehicles are bent this way. See Fig. 2H2d

9. WRINKLE BENDING
is a method for bending large, heavy-wall, tubing or pipe. It is
applicable to field conditions since it can be done by hand with
no special tooling. One side of the tubing is heated locally by
gas torch to the point where the tubing wall softens .
A compressive force is applied to the pipe, causing the soft
area to wrinkle and the tubing to shorten on that side,
producing a shallow bend.

12. ROLL BENDING
is means of putting gentle bends in tubing pipe, bars,
rolled or extruded shapes, plates and sheets.
When used for pipe or tubing, the process is limited to
heavier-walled work pieces with bend radii usually not
tighter than 6 times the diameter though 4 times is
possible.
When the process is used with sheet metal, a common
application is the production of cylindrical parts.

16. ROLL EXTRUSION BENDING
This method is used for large, heavy- walled pipe. One
wall of the pipe is swaged from the inside, causing it to
elongate and the pipe to bend. Pipes of 5 to 12 in (125
to 300mm) can be bent with this method to a
minimum bend radius of 3 times the diameter.

19. BULGING, MECHANICAL
is an operation that expands a portion of a tubular or
cylindrical part. When done mechanically, a segmented die
with segments held together by springs- is inserted into the
tubular part.
The process produces a patterned expansion (flat spots
around the tubing) because of open spaces between the die
segments when they are expanded. These flat spots can be
minimized by rotating the segmented die and repeating the
operation.

20. BULGING, HYDRAULIC
expands tubing, pipe, or cylindrical part, by applying
internal force with a pressurized liquid or an
elastomer (low-durometer rubber or polyurethane)
punch. The work piece is contained by a die that is
split so that the bulged part can be removed after the
operation.

23. END
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