4 Industrial Laser Solutions SEPTEMBER/OCTOBER 2015 www.industrial-lasers.com
Laser process enables reftting of glued
saw blades with minimal stress
HANNOVER, GERMAN Y –
Natural stone, like marble or granite, is processed with saw blades
with hard-wearing diamond cutting segments. When these are
damaged or worn, the
cutting segments have
to be replaced. Usually,
the whole saw blade is
sent to a repair shop.
Laser Zentrum Hannover eV (LZH; www.lzh.de) and the
Institute for Tool Research and Materials (IFW; Remscheid,
Germany) have developed a mobile, laser-based process
chain for gluing the cutting segments onto the saw blade
and subsequently removing them without causing damage.
Until now, the soldered cutting segments are thermally
detached, the soldering partners prepared, and the new
cutting segments are then soldered onto the saw blade.
The thermal stress from soldering leads to axial runout
deviations (warpage) and an unfavorable distribution of
stress in the saw blade. Consequently, the cutting qual-
ity decreases and cutting losses
increase. Therefore, additional
process steps are necessary to
align and preload the saw blades.
Laser for all the
LZH and IFW have developed
a laser-based process chain for
manufacturing glued saw blades.
The laser radiation exerts minimal
thermal stress onto the saw blades
so that in the best case, the blades
can be reftted without preloading or
alignment. Ideally, the saw blade can
be reftted as often as necessary.
The laser-based process for
the frst and consequent fttings
of the saw blade consists of four
steps (FIGURE 2): First, the sur-
faces of the segments and the saw blade are prepared
by structuring them using a pulsed laser system. The
segments are then glued onto
Mapal relies on additive manufacturing
to produce insert drills
LICHTENFELS, GERMAN Y – Precision tool specialist Mapal is using additive manufacturing to produce drills, with amazing results. The company now relies on additive tool solutions with LaserCUSING systems by Concept Laser.
High performance, long service lives, and rapid tool changes are the central
requirements for modern tool concepts. Mapal’s QTD insert drill (FIGURE 1) excels
with good chip deformation and reliable chip removal. Thanks to its geometry, precision features make high cutting specifcations and drill quality possible. They now
offer four types of the inserts for steel, stainless steel, cast iron, and aluminum.
Additive manufacturing from metal powder using laser melting systems by
Concept Laser makes entirely new design approaches possible. The QTD insert
drill was previously available in diameters of 13mm and greater, limited by the
coolant supply in the tool body. The smaller the tool body, the greater the adverse
effect the standard central coolant supply on the tool’s performance. Central coolant supply weakens the core of the drill and makes it unstable. In addition to this,
the cooling channels must be ever smaller, reducing the fow of coolant to the
insert. The new steel tool body design with spiral cooling channels is not usually
used for small diameters. A new spiral cooling concept
FIGURE 1. The
process could, in
the future, replace
reftting saw blades.
FIGURE 1. The QTD insert drill.
(Courtesy: Mapal Fabrik für
Präzisionswerkzeuge Dr. Kress KG)
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