TPT November 2011

T echnology U pdate 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.

Patented system for thread-cutting on oil field pipes

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

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

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: christian.thiele@phorn.de Website: www.phorn.de

Sample tools for thread-cutting, chamfering and turning to diameter

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N ovember 2011

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