CoroMill® 325 - Thread whirling
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High precision threading performance CoroMill® 325 – thread whirling

Designed for the medical industry The growing use of medical bone screws, implants and other micro-components creates a need for techniques that produce special thread forms quickly and at high tolerances. New thread whirling inserts and holders from Sandvik Coromant meet this need for a large number of sliding head machine types. They can thread long, slender components from rough stock at high speeds, without the need for a dedicated thread whirling machine. No bending on long slender components Multi-inserts apply even cutting pressure on long, slender components – creating...

The thread whirling process The spindle unit is tilted to the helix angle of the thread A thread whirling ring with inserts on the inner diameter rotates around a cylindrical component to cut the thread. The smooth, tangential cutting action minimizes cutting forces to give high metal removal rates. 1. Mount the whirling ring onto the spindle unit 2. Tilt the spindle unit to the desired helix angle of the screw 3. Program the ring off-centre, in relation to the thread diameter 4. Rotate the whirling ring and component in the same direction (climb milling) for optimum tool life 5. Rotate the...

Easy tool set-up saves time The thread whirling ring can be quickly attached outside the machine, in a clean environment. 1. Insert the ring over the spindle screw 2. Turn the ring anticlockwise to the bottom position 3. Tighten the ring screw For standard threads Specially-formed inserts for thread whirling are designed to create HA and HB thread forms. These threads have the specific dimensions and tolerances needed for bone screws and other medical implants. HA thread form HB thread form HA and HB threads correspond to ISO 5835-1991, for medical screws

325-12AP40-16M Citizen PCM 325-12AQ40-16M Citizen Jarvis 325-12BB40-16M Star Star 325-20CC52-16M Tsugami Tsugami 325-12DD40-16M Tornos Tornos 325R16-150HAF01, GC1105 325R16-175HAF01, GC1105 325R16-175HBF01, GC1105 325R16-275HBF01, GC1105 Whirling ring codes MTM Spindle producer Insert code and grade Wide range of sliding head machine types Insert assorment Designed for medical machining All Sandvik Coromant thread whirling inserts are available in GC1105 – the first-choice grade for medical machining. GC1105 offers sharper edges and a burr-free component surface: - Dedicated to machining...

Performance test Material: Titanium Ti-6AI-4V ELI Thread dia, mm (inch) 3.5 (0.139) Length, mm (inch) 25 (0.984) Thread profile: HA4 Pitch, mm (inch) 1 (0.04) Machine tool: Tsugami 14 Components/year: 500 000 Cutting data hex, mm (inch) vc, m/min (ft/min) No. of passes Cycle time, min No. of components Result: 511% increase in components produced In this application, the superior tolerance of the Sandvik Coromant ring-and-insert combination resulted in a 500% increase in the number of bone screws produced, compared to a competitor whirling solution. Competitor Sandvik Coromant 0.04 (0.002)...

M S M S M S M S M S A complete bone-screw solution Thread made by thread whirling Precision tooling for the medical component industry. Machine: CNC sliding head machine Main spindle: 10,000 rpm Sub spindle: 8,000 rpm Material: Stainless steel – Sandvik Bioline 316 LVM Titanium – Ti6Al4V ELI Holder: QS-SDJCR 1212E 07 Insert: DCET 070201-UM, GC1105 vc, m/min 50–100 40–60 (ft/min) 160–330 130–200 fn, mm/r 0.03 0.03 (inch/r) .0012 .0012 ap, mm 0.3–1.0 0.3–1.0 (inch) .012–.039 .012–.039 SUB SPINDLE MAIN SPINDLE vc = Cutting speed fn = Feed ap = Cutting depth Turning front of head Turning back...

The smarter choice for medical machining Contact your local Sandvik Coromant representative for more information about thread whirling and other advances in medicine (including inserts for cobaltchromium implants) or check out www.sandvik.coromant.com. Sandvik Bioline Materials technology for the medical industry and one of today’s most advanced R&D programs. Working together with Sandvik Coromant for your complete clinical component needs. www.smt.sandvik.com/medical Your local Sandvik Coromant distributor: Round inserts for machining titanium and cobalt-chromium hip-joint implants...