Hitachi CN 18DSL Instruction Manual page 15

Cutting materials
1/16" (1.6 mm) mild steel
plates
1/16" (1.6 mm) mild steel
corrugated and trapezoidal
plates
3/64" (1.2 mm) stainless
steel plates
When the machine is used according to the service life
indicated in the above table, the punch will have abrasions
as shown in the enlarged diagram of the worn punch
tip in Fig. 10. This is when the punch and die should be
replaced.
Punch
Wear due to
abrasion
CAUTION
If the punch and die are used longer than the
specifi ed service life, the die holder will be
subject to excessive stress and may break off .
When a 1/16" (1.6 mm) mild steel trapezoidal plate
is cut, wear will be especially quick. Replace the
punch and die as soon as possible after reaching
the service life.
2. Punch and die replacement (see Fig. 10)
CAUTION
During the following operations, use care to
prevent dirt adhering inside the gear cover,
inside the die holder and around the piston.
(1) Punch replacement
(a) Loosen the M8 hexagon socket set screw
mounting the die holder (see Fig. 8) and remove
the die holder.
(b) Loosen the M5 hexagon socket set screw
fastening the punch to the piston and pull out the
punch. (see Fig. 11)
Service life cutting
lengths of punch and die
1000 ft (300 m)
160 ft (50 m)
650 ft (200 m)
Cutting Edge
Fig. 10
Hexagon Socket
Hd. Set Screw M5
(c) Insert the new punch while aligning the taper
hole of the punch and the direction of the M5
hexagon socket set screw, then securely tighten
the hexagon socket set screw (see Fig. 12).
Taper Hole
Punch
(2) Die replacement
Loosen the 2 machine screws and replace the die.
(see Fig. 11)
(3) Lubrication
When the above replacement operations are
completed, apply a suitable amount of machine oil
to the sliding surfaces around the punch and die and
operate the machine without a load.
English
Gear Cover
Piston
Punch
Die
Die Holder
Machine Screw M3
Fig. 11
Hexagon Socket Hd.
Set Screw M5
Piston
Fig. 12
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