TPT November 2011

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62 November 2011 ›
Technology Update
End machining of oil
field pipes and sleeves
NEW tool systems from Paul Horn
GmbH are designed for the end
machining of rotating or stationary oil
field pipes up to 25" diameter. The
product range currently includes tools
for external and internal turning of
API and special threads, internal and
external chamfering, machining sealing
seats, grooving, parting off and peeling.
The grooving and parting off tools are
based on the proven S100 insert. Their
working range has been expanded for
the requirements of the oil industry to
groove widths of 10, 12 and 16mm and
a groove depth up to 65mm. They offer
high feed rates with long engagement
times, a good chipping process and
reliable guidance.
An ISO insert product range available
from stock has been developed for
chamfering and peeling.
The high thermal resistance of the
inserts enables high feed rates and the
removal of thick chips which are reliably
broken off due to the geometry.
Using the inserts for
thread turning, pitches of 5,
8 and 10 threads per inch
on internal threads and of 3,
5, 8 and 10 threads per inch
on external threads can be
machined.
Positive clamping of the
inserts in the toolholder is
made using one or two bolts
depending on the number of
teeth.
The secure seating of the 5 and
7mm thick inserts guarantees a lateral
undercut engagement that locates in
similar fashion to a dovetail joint. This
highly precise mounting ensures repeat
positioning accuracy ≤ 0.005mm.
Their special feature is the chip
breaker incorporated into the insert.
As no clamping plate is required for
chip forming, fewer clamping tools
are needed. Heat dissipation is also
improved which manifests itself in higher
precision and smoother operation as
well as in a longer tool life and a more
favourable price. Both the holders for
the external machining as well as those
for internal machining have an internal
coolant supply.
The new patented system of insert
and chip former provides a significant
improvement for thread cutting on
pipes. Thereby, the insert is also
mounted in the recess of the holder and
supplemented from above with a chip
forming cover.
No chip breaker is needed with
this solution and the insert can be
manufactured very cost-
effectively. The cover and
the insert can be installed
and removed separately.
Under test, the new
tools have confirmed
their capability for taper
turning and thread
cutting. A combined tool
was first used to turn a
1:16 internal cone on
a seamless 10" pipe
section of quality level
P110 (tensile strength
760-970 N/mm²), and
then the 5TPI thread was
cut. In comparison with
established competing
products, the tool life for
the Horn tools increased
by the factor of 2.1.
Paul Horn GmbH –
Germany
Email:
Website:
Sample tools for thread-cutting, chamfering and turning to diameter
Patented system for
thread-cutting on oil
field pipes