controlled press-in operation onto the
mechatronic SCHUNK PPU-E 15 Pick &
Place unit. For the freely programmable
pacemakers, position and speed can be
flexibly varied.
The unit gently moves into the
appropriate tool, then bends and presses
the elements with a precisely adjusted
force, before the axis returns to its
original position at maximum speed and
places the part onto the pallet of the
linear transport system.
The PPU-E, which is linearly directly
driven and thus transmissionless, is
currently the fastest Pick & Place unit on
the market, whereby the size is specially
tailored for use in electronics and small
parts assembly. Due to a width of only
60 mm and a complete media feed via
the back panel, it enables a particularly
compact system design.
For a complete cycle with a 145 mm
horizontal and 45 mm vertical stroke,
the productivity booster only needs 0.6
s for 1 kg additional mass and 2 x 50
ms gripping time. At its peak, the PPU-E
15 delivers a whopping 100 picks per
minute. Such high numbers of cycles are
not required at LEM.
It much more depends on the smooth
motion profile and the repeat accuracy of
the axis, which is 0.01 mm.
The smoother the movements of the
individual handling systems, the lower
the vibrations of the entire system. That's
what LEM is all about.
The smoother the movement curves,
the more reliably the high quality of the
electronic components is achieved.
For example, the tolerance in the
flatness of four bent contacts is just
0.015 mm.
This is exactly why LEM uses the
strengths of the SCHUNK PPU-E for.
Instead of using a tolerance and wear-
prone transmission of movement, the
unit is moved by a wear-free direct drive.
This minimizes the maintenance
effort, increases the permanent repeat
accuracy, and simplifies the individual
programming.
To increase process stability, both
horizontal and vertical motions can
be monitored with an absolute path
measuring system.
Air-sprung test station
LEM goes a step further with two
test stations for optical inspection
of the components: "Here we need
speed combined with a particularly
gentle movement," Frédéric Cattaneo
explains. 2D and 3D cameras capture
the components highly accurately on all
sides, measure the contacts and check
the evenness of the previously bent
elements.