(6 ) CNC welding machines:
|
Figure 21.6 4 axis
CNC Tig welding machine
|
The salient features of CNC welding
machines are:
- Superior quality and weld precision.
- These machines are also equipped
with rotary tables.
- Weld moves, welding feed rate, wire
feed, torch heights & welding current can be programmed.
- CNC welding machines are used for
laser welding, welding of plastics, submerged arc
welding, wire welding machines, butt welding, flash
butt welding etc.
- These machines are generally used
in automobile work shops
- Cost of these machines will be twice
than the conventional welding machines.
|
CNC EDM & WEDM machines:
EDM is a nontraditional machining method primarily
used to machine hard metals that could not be machined
by traditional machining methods. Material removal will
be taking place by a series of electric arcs discharging
across the gap between the electrode and the work piece.
There are two main types- ram EDM & wire cut EDM.
In wire-cut EDM, a thin wire is fed through the work piece
and is constantly fed from a spool and is held between
upper and lower guides. These guides move in the x-y plane
and are precisely controlled by the CNC. Wire feed rate
is also controlled by the CNC. |
|
Figure 21.6 (a) Ram
EDM
|
Figure 21.6 (b) Wire
cut EDM
|
|
|
/fig-8.gif)
/fig-9.gif)
/fig-10.gif)