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METALWORKING EQUIPMENT
AND TOOLS
FINISHING MACHINERY OF

MEDICAL PURPOSE AND

CUTTING TOOLS

REVIEW OF MODERN

TECHNOLOGIES

A continuous increase in the operational characteristics of engineering products is dictated
by the growing demands on the nodes of machines and mechanisms, as well as tools. These
requirements include:
● minimization of mechanical friction losses in the nodes of machines and mechanisms;
● reduction in the roughness of shaped working surfaces of parts to Ra less than 0.1 μm;
● increase in the resistance of cutting tools;
● guaranteed accuracy of the shape and location of surfaces after finishing;
● increase in reliability during multi-cycle alternating loads;
● increase in the corrosion resistance, etc.
Previously used processing methods
(grinding, manual polishing, diamond smoothing,
chemical and electrochemical polishing, etc.)
often do not ensure compliance with the
above requirements and are notable for their
high labor intensity and low productivity, the
complexity of technological equipment, as well
as low flexibility for readjustment for various
processing item nomenclature.
These technologies are being replaced
by equipment and processing methods that
are distinguished by simple kinematics of
the working bodies, speed and flexibility
during readjustment, and high reliability.
Such modern methods include towing and
streaming finishing technologies, carried
out, for example, on the machines of OTEC
PRÄZISIONSFINISH GmbH (Germany).
The towing finishing technology, DF
series machines (Fig. 1), is based on the
movement of the planetary mechanism with
working bodies in the form of holders into
which the work pieces are fixed. Due to the
presence of triple rotation of the latter one and
their immersion in a drum with a stationary
abrasive mixture, at the same time, the
following are provided:
Fig. 1. General view of machine tools models DF 3/4 (a),
DF 5/6 (b) working area (c) with fixed end mills. ● deburring on steels and non-ferrous metals
after the operations of blade processing,
casting and plastic deformation;

● smoothing of sharp edges and chips on the surfaces of metals with high hardness;
● reducing the height of microroughnesses to Ra values of less than 0.2 microns even on
surfaces with shaped profiles (especially relevant for cutting tools made of hard alloy and medical
implants made of CoCr alloys);
● controlled rounding of cutting edges and removal of drip PVD coatings from the working
surfaces of cutting tools.

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