Cincinnati 175 CB - Types of dies

CYLINDER
RAM
FILLER
BLOCK
LOWER
DIE
UPPER DIE
o Z
W 0
(J)i=
°00
..J 0
0a.
PISTON
o
BED
BED
rr-;;r-,,_ ~
~r ~l ~,!
Wi ~ ,,~;rHROAT
J: -+-- l StJ
ffi· ~ ....
0.. (f)J:
o g~
OJ:
FIGURE 18
FIGURE 19
THROAT: Normally most forming on press brakes is done
between the housings. However, when loltg materials or
forming at one end of the machine is required, the housing
throat provides space for the material. This space is
limited by the depth of throat.
CLOSED POSITION: This is the overall height of· the dies
and filler block when ram is at the bottom of the stroke
and is adjusted to make the proper bend. See Figure 19.
DIE PENETRATION: This is the distance the upper die
penetrates the lower die. For a 90° air bend die the
penetration is about 0.4 of the lower die opening.
The . combined height of the dies and filler block when in
the closed position must be more than the closed height but
less than the open heigh t dimension. The difference
between this combined height and the open height is the
maximum amount of stroke which can be used.
FILLER BLOCKS: Various types of filler blocks are
available to hold the lower die. They provide a means of
adjusting and clamping the lower die in position. Filler
blocks are optional and should be selected to suit the
machine tooling and type of bending.
MICROCROWNING: A carefully engineered crown is
machined into the bed and ram of each CINCINNATI press
brake. It is designed so the bed and ram will be parallel
at 2/3 of machine capacity with a uniformly distributed
load. This feature improves bend accuracy under normal
forming loads and minimizes shimming of the dies.
TYPES OF DIES
AIR BEND DIES: These dies are made with sharper angles
than the angle to be formed. The metal being formed
contacts only the point of the upper die and the two edges
of the lower vee die opening. See Figure 20. Thus, all of
the ram pressure is used in· forming and none in squeezing
the metal. Any greater angle than the die angle can be
formed by adjusting the stroke reversal position upward as
required. See the PRESS BRAKE CAPACITIES bulletin
included with this manual for further air bending
information.
AIR BEND
FIGURE 20
15