Cincinnati 175 CB - Set Machine Controls; Removing Tooling

NOTE: Short, lightweight dies may be installed as a
set and slid into position.
7 . Moderately tighten the ram die clamps to prevent male
die from falling should the ram be raised. Align dies
before seating upper die.
8. Inch the ram downward until sufficient tonnage builds
up to seat the upper die against the ram nose.
Tighten the die clamps.
...--.------- IMPORTANT ----------.
When seating some dies it may be advisable to
place wood blocks or soft metal between dies
to prevent damage to the dies. Short dies must
have sufficient shoulder area to prevent sinking
into the ram, bed or filler block .. See TONNAGE
CONTROL in Section 4.
9. Adjust the bottom stroke stop cam upward until it
contacts its limit switch and the tf green" SET-UP light
is lit (See Figure 5).
10. Jog the ram upward to provide sufficient clearance
between dies to check front-to-back alignment. Check
alignment and tighten the filler block or lower die to
the bed.
11. Again jog the ram upward providing metal clearance
between the dies. Raise the bottom stop ~ lighting the
SET- UP light.
SET MACHINE CONTROLS
After inserting the tooling into the press brake, the
machine controls should now be set for the particular
tooling and job being run . Keeping records of these
settings will save time for future repeat jobs ..
MODE Selector: For production runs this selector should
be placed in either the "SINGLE STROKE - NO AUTO
RETURN
n
or the "SINGLE STROKE - AUTO RETURN"
position. In general, the MODE selection and the palm-
button - footswitch selection will be determined by the part
being formed and the tooling used. Whenever possible it is
recommended that the palmbuttons be used as they provide
point-of-operation safety.
DOWN STROKE - SPEED Selector: This selector provides
for a combination of any two of the three down speeds.
Full tonnage is available in both LOW and MEDIUM speeds
while 45% of full tonnage is available in HIGH speed. The
forming speed selection is determined by the part to be
formed and the required tonnage. Parts which have long
front or back legs should be formed in LOW speed to
prevent whip-up and back bending of the material.
BOTTOM STROKE STOP: This cam determines the bottom
reversal point of the ram and is used for air bending. A
counter readout is provided to allow positioning in
thousandths of an inch. The bottom stop should initially
be set so there is at least metal clearance between the
upper and lower dies. The final position of this stop is
determined by making trial bends. If bottoming dies are
being used, the bottom stroke stop should be lowered far
enough to prevent premature ram reversal.
TOP STOP: Adjust the top stop cam rod to provide
sufficient space for inserting and removing the part from
the die.
SPEED CHANGE: This position is usually set so the ram
will shift into the selected forming speed, approximately
1/4" before contacting the workpiece.
DOWN STROKE - STROKE STOP: This selector will (when
turned ON) automatically stop the ram on the down stroke
at the speed change point. It may be used as a convenient
stopping point to position a scribed line on the workpiece.
20
TONNAGE CONTROL: This is an optional machine feature
which will limit the output tonnage of the machine as
selected. It should be used whenever excessive tonnage
could damage the tooling, part or machine. When using
short dies it becomes very important to guard against
excessive tonnage, which could sink the dies into the ram
or filler block.
UP STROKE - STROKE STOP: This is an optional machine
control which will (when selected) automatically stop the
ram motion immediately after passing through the bottom of
the stroke. This control enables the operator to gain
control of a formed part before the ram returns to the top
of the stroke position.
RAM TILT ADJUSTMENT: Normally the bed and ram
should be set parallel to one another. Occasionally it may
be necessary, because of the tooling or off -center loading,
to "tilt" the ram for uniform bending.
...----------CAUTION---------
BEFORE MAKING BENDS, MAKE SURE ALL
SAFETY DEVICES ARE BEING USED AND ARE
FUNCTIONING PROPERLY. EVALUATE EACH
JOB FOR PROPER SAFEGUARDING. SEE ANSI
STANDARD B 11.3 - SAFETY REQUIREMENTS
FOR THE CONSTRUCTION, CARE AND USE OF
POWER PRESS BRAKES.
ALWAYS CYCLE THE MACHINE SEVERAL TIMES
AT THE START OF A NEW JOB, AFTER EVERY
BREAK, OR AT THE BEGINNING OF A NEW
SHIFT TO VERIFY THAT THE CONTROLS ARE
SET AND FUNCTIONING PROPERLY.
WHEN MAKING A BEND KNOW HOW THE PART
WILL REACT ON THE FORMING STROKE AND
ON THE RETURN STROKE.
REMOVING TOOLING
After the production run has been completed and the
tooling is to be removed:
1. Set the machine controls:
MODE Selector -----------------------HINCH"
SPEED Selector ----------------------MEDIUM/LOW
Speed Change Cam ------------------All The Way Up
TONNAGE Control (Optional) --------Set on minimum
Tonnage
2. Adjust the ram so the vertical clearance between the
upper and lower dies is approximately 1/16" to l/S" on
the up stroke.
3. Lower the bottom stop to its maximum down position
(O.ooort). Lower the top stop cam until it contacts its
limit switch, changing the ram direction light from
green to red.
4. Shut OFF the power to the main drive motor.
5. Loosen the die clamp nuts to free the upper die
tongue. Loosen the filler block set screws to free
lower die.
..----------IMPORTANT ---------.
When loosening the ram die clamp nuts, be sure the
upper die will remain trapped between the lower die
and the slot in the ram nose. See Figure 30.
6. The dies can now be removed endwise from the machine
either together or individually.