CONDITION: This Machine Appears to be in Excellent Condition!
System Design and Information from Mfg News.
Machining for Fine Details
Laser removal is ideal for
manufacturing fine structures and cavities and offers short machining
times and low personnel attendance. "The advantages of the laser are
greater when compared with conventional cavity EDM production methods,"
said a Deckel Maho Gildemeister (DMG) spokesperson. "Above all the
directness of laser machining brings with it a time saving of up to 70%.
And in the ratio of attended to unattended machining times, the laser
proves to be up to 90% better than the EDM process."
From its machine range
Lasertec offers two variants in the category of laser removal. The
LaserOnly machines of the DML 40 series can create the finest of
contours and cavities without tool costs. In addition to the pure laser
removal machines of the DML 40 series, last year the combination machine
DML 60 HSC was introduced. The HSC milling head with maximum spindle
speeds of 42,000 RPM first of all removes material in a preliminary
stage. Immediately afterwards, the laser head - in the same fixture -
takes over for the finishing stages of fine details, sharp edges,
cavities, and lettering.
The method of laser removal
is based on a complex system of optics and is the same for the DML 40
and DML 60 HSC series. The cutting tool is an Nd:YAG laser beam of 100 W
mean power previously pulsed over a Q switch for a top power output of
between 13.4 and 26.8 hp. Focusing the beam to a diameter of 0.1 mm
concentrates at this point very high power densities that cause the
material to vaporize. Depending on the targeted surface quality,
material is removed in thicknesses of 1 to 5 Ám.
The beam itself is controlled
by a laser head with high dynamic response. The distance from the lens
to the material is 100 mm. The corresponding controller for the optics
then guides the laser beam, focused to a diameter of 0.04 or 0.1 mm, at
ultra high speed step by step over the surface for machining until the
layer has been removed and work can commence on the next step.
In addition to the "normal"
CNC, the machine is connected to a standalone computer with
high-resolution monitor, computer keyboard, and mouse that is used to
prepare CNC programs independently of the control. A network facility
allows the computer to be integrated easily in host networks for
importing CAD data and providing ready-to-run programs for the control.
The geometrical data from CAD
systems are transferred in the STL format. Programming itself requires
solely the geometry of the material to be machined - the programming
system then automatically breaks down these data into layers which
finally provide the basis for generating the laser machining paths. The
greatest part of the calculation is done automatically, and also the
control itself does not need specific CNC skills to operate.
Laser removal is today being
used in a large number of applications. These include, for example,
prototype mold construction and rapid tooling where micro switches,
electronic and semiconductor structures, medical engineering components,
injection molds, mold inserts, and seals are machined by laser. Further
applications are recessing and embossing for reliefs, logos, coins, form
punches, molding stamps, and lettering. And also tool makers can now
profit from the laser's potential: laser removal makes indexable
inserts, PCD and CBN materials, chip breakers, and hard-metal molds
ready for use in manufacturing. Other examples are miniature models
(model cars, model railways, toys) and job lots (flexible manufacturing
from simple cavities to fine, high-precision structures on the one