MEDICAL SECTOR PRODUCTIVITY IN OPERATION
indexable insert with ALU geometry is used
for undercutting operations in molybdenum.
Composites are a further case in point. The
rotors for X-ray tubes, for example, are a
composite of oxygen-free copper, X10-CR13n
stainless steel and molybdenum. For this
task Siemens uses high positive indexable
inserts from Arno for both internal turning
and external roughing. The company also
deploys specially designed indexable-insert
drills for drilling work in molybdenum, copper,
titanium and nickel.
“In the beginning, we used drills from
another supplier, but they were incapable of
lasting longer than fi ve parts,” says Karsten
Raasch, programmer at Siemens Rudolstadt.
“On top of that, we unfortunately sustained a
large number of rejects and the machine
crashed several times, due to drill
Arno tested and modifi ed its SharkDrill²
drill inserts, with the result that vibrations
were reduced and fi nish quality was
improved. This modifi cation served to
quadruple tool life. “It saves us enormous
costs; not only tool costs but also
changeover times,” states Jahn.
Remaining in Germany, for more than 20
years Königsee Implantate (based in
The Starrag Bumotec s181 is enabling
the fi nish machining of a multi-operation
distributor to a burr-free state
Königsee) has been producing implants and
instruments for traumatology, orthopaedics
and spinal surgery. In the course of
continuous process improvements, two
EvoDeco 16 machines from Tornos (https://
is.gd/pafeku) have been installed.
As in many manufacturing sectors, pricing
pressure has reached the medical industry
and this means that top quality produce from
Germany can only be competitive by applying
a sophisticated production strategy. For this
reason, Königsee has invested in Tornos.
All the screws at Königsee are produced
in the turning shop. The material used is
usually titanium or implant steel. Titanium
offers up two special challenges: low
thermal conductivity and diffi culty in breaking
the chips, which require special cooling
strategies. Tool wear is particularly high, due
to the extreme toughness of the material.
Batch sizes are between 25 and 150 pieces.
All screws must be as burr-free as
possible, in order to minimise rework.
Although Königsee had already been well
equipped with seven Tornos machines, the
company decided to purchase two EvoDeco
Christian Hedwig, manufacturing engineer
for turning operations at Königsee, says:
“On the two new machines we can produce
a larger diversity of parts, which makes us
much more fl exible. In addition, the large
number of tools opens up possibilities, in
terms of machining even more complex
workpieces in one set-up.”
To do so, the EvoDeco 16 machines have
been further optimised by Königsee. For
instance, a high pressure coolant system
from Müller Hydraulik has been installed,
delivering a pressure of up to 150 bar to
feed directly to the individual tool blocks
through a manifold block. This confi guration
ÕUnlimited TomorrowÕ initiative
Stratasys (https://is.gd/iregoz), a specialist in additive technology
solutions, is teaming up with Dassault Systèmes (https://is.gd/
wigeci) and industry innovator Easton LaChappelle to power an
initiative called ‘Unlimited Tomorrow’.
Unveiled at the recent Solidworks World 2018 event,
Stratasys is the exclusive provider of 3D-printing technology for
the initiative, ushering in a new age of custom-designed, lowcost,
highly functional prosthetic arms for those who need them
most. The Unlimited Tomorrow team will collaborate with
Stratasys on research, development and production of the
Traditional prosthetic models are often heavy, cumbersome
and expensive, costing recipients a minimum of $20,000 per
device, to upwards of $100,000. The decision to spend this on
children is further complicated because many quickly outgrow
models and thus require new devices. Unlimited Tomorrow
rethinks the way artifi cial limbs are made by targeting common
pain points such as customisation, weight and cost.
Placing the recipient fi rst, the team builds intuitive, scalable
models to engineer custom devices from start to fi nish. Unlimited
Tomorrow also taps into digital scanning and 3D-printing
technologies to streamline development and reduce multiple
wants to usher
in a new age
impact to each patient.
Core to the initiative is the selection of Stratasys and
Dassault Systèmes as the programme’s dedicated 3D printing
and CAD/CAE suppliers. Stratasys’ co-operation provides
Unlimited Tomorrow with the development and production of
prosthetics via the company’s PolyJet team, as well as Stratasys
With Dassault Systèmes’ Solidworks applications, Unlimited
Tomorrow exploits the company’s 3D design and engineering
portfolio to facilitate an integrated design-to-creation process,
bringing innovations to market faster.
www.machinery.co.uk @MachineryTweets October 2018 43