88/132 Operation
Bosch Rexroth AG
, SYEPS series 1X, RE 30201-B/07.2014
The possible thickness of the metal sheets to be punched depends on the punching
force of the cylinder and the size of the tools used. The typical thickness of metal
sheets is 0.2 to 6 mm. Thick metal sheets or sheets made of special materials must
in most of the cases be punched at lower punching rates for process and noise
emission reasons. Lower punching rates can be realized by reducing the stroke
velocity or by selecting the operating mode “soft punch“.
In this operating mode, the punching axis is moved not in synchronism with the
metal sheet-moving axes (X- and Y-axes). In this mode, the metal sheet is moved
continuously and does not come to a standstill when the engraving tool enters the
metal sheet. This principle works very well with small penetration depths and it can
be used to make engravings. This operating mode is mainly used to engrave letters
or symbols on metal sheet. The motion sequence is as follows: After a changeover to
the operating mode “engraving” the punching axis is in the rest position above the
metal sheet POP. The engraving process is started by applying a High level at digital
input “IN 2 stroke start “. As long as the digital input “stroke start” is high, the
punching cylinder moves between the positions POP and PUP as shown in the figure
below.
POP
PUP
0 mm
x
t
IN 2
OUT 2
Position POP reached
Start stroke
R423
R425
Fig. 63: Engraving strokes with associated I/O signals
Positions and velocities can be set as described in the operating mode “punching.
The operating mode “soft punch” works like the operating mode “punching”. The
input/output signals of both punching operating modes are identical. The sequence
of “soft punch” differs from the normal punching stroke in that the punching cylinder
travels at slower velocity when moving downwards between the positions PSP and
PSP2. PSP and PSP2 are set by means of R447 and R448. The reduced velocity
between positions PSP and PSP2 is set with R449 “valve stroke limit“. The small
valve aperture diminishes acoustic shock when the tool breaks through the metal
sheet. “Soft punch” works as shown in the Figure below. The punching axis moves
from position POP to position PSP with ramp R421 “negative ramp gradient“. From
position PSP to position PSP2 the axis moves with the valve aperture set in R449
“valve stroke limit”. From PSP2 to PUP the punching axis moves at the velocity set
with R446 “soft punch ramp”. Back from PUP to POP the axis moves at the velocity
set with R420 “positive ramp gradient”.
Engraving/marking - 37
Softpunch - 38
