| Before the actual
cutting begins the material is firmly sandwiched
between the die and V-Ring plate. This prevents the material
from
flowing laterally. The material is also held by a so called
V-Ring
that is formed into the material along the outside contours
of the
part.
The die as well as the V-Ring plate are subject to wear and
can be
re-worked several times. Therefore, the V-Ring is machined
into the
hardened steel.
Two methods are used to make the V-Ring (stinger):
a) by EDM (electrical discharge machining)
b) milling with tungsten carbide cutter
Experience has shown that milling the V-Ring is not only
very
economic but also provides a better quality, as no changes
occur
in the metallurgical structure. |
V-Rings
