High precision threading performanceCoroMill - PDF document

High precision threading performanceCoroMill® 325 – thread whirling Designed for the medical industryThe growing use of medical bone screws, implants and other duce special thread forms quickly and at high tolerances.New thread whirling inserts and holders from Sandvik Coromanttypes. 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 componentsMulti-inserts apply even cutting pressure on long, forms without bending.Chip controlChip control is superior to single-point threading, enabling more continuous and productive machining.Increased productivitycycle time by minutes.Faster set-up timesReduce downtime by eliminating the need to match rough and nish insert forms and special support devices.Increased tool lifeThread whirling inserts have stronger cutting edges than Cost savingFinishing treatment is not required after thread whirling, unlike single-point threading.Deeper threadsDeeper thread forms (such as Acme) can be achieved more easily. The thread whirling processThe spindle unit is tilted to the helix angle of the threadA thread whirling ring with inserts on the inner diameter The smooth, tangential cutting action minimizes cutting forces to give high metal removal rates.Mount the whirling ring onto the spindle unit Tilt the spindle unit to the desired helix angle of the screw Program the ring off-centre, in relation to the thread Rotate the whirling ring and component in the same Rotate the workpiece at a slower speed, determined by its Coordinate movement of the whirling ring with the rotation of the component for best surface and productivity. (chip thickness is determined by the feed rate of the whirling ring)The spindle and ring rotate in the same direction to achieve climb milling and productivityOff-centre positioning 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 screw2. Turn the ring anticlockwise to the bottom position3. Tighten the ring screwFor standard threadsSpecially-formed inserts for thread whirling are designed to create HA and HB thread forms. These threads have the specic dimensions and tolerances needed for bone screws HA thread formHB thread formHA and HB threads correspond to ISO 5835-1991, for medical screws 325-12AQ40-16MJarvisTornos Tornos325R16-150HAF01, GC1105325R16-175HAF01, GC1105325R16-175HBF01, GC1105325R16-275HBF01, GC1105 Whirling ring codesInsert code and gradeWide range of sliding head machine typesInsert assormentDesigned for medical machiningAll Sandvik Coromant thread whirling inserts are available in GC1105 – the rst-choice grade for medical machining. GC1105 offers sharper edges and a burr-free component Enables longer, more continuous runs, with Choose your own thread! Order special inserts for any thread profile; and rings for other spindle units. See your Sandvik Coromant representative for more information and to make your request for non-standard rings and inserts.Cutting data for ISO S materialsFor screw diameters 3–10 mm (.12–.40 inch) Performance testThread dia, mm (inch)Length, mm (inch) Pitch, mm (inch)Components/year: , mm (inch), m/min (ft/min)Cycle time, minIn 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. M S M S M S M S M S A complete bone-screw solutionby thread whirlingPrecision tooling for the medical component industry.10,000 rpm 8,000 rpm Stainless steel – Sandvik Bioline 316 LVMHolder: QS-SDJCR 1212E 07Insert: DCET 070201-UM, GC1105, FeedTurning front of headTurning back of head and partingHolder: Insert: N123E2-0200-0002-GF, H13AMACR 3200N, GC1025 Drilling of headDrill: R840-0250-50-A0B, GC1020 Holder: CXS-A0750-04Insert: CXS-04T098-10-2206R, , mm/rClearance turning of bottom of hole The smarter choice for medical machiningContact your local Sandvik Coromant representative for more information about thread whirling and other advances in medicine (including inserts for cobalt-chromium implants) or check out www.sandvik.coromant.com.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/medicalYour local Sandvik Coromant distributor: Round inserts for machining titanium and cobalt-chromium hip-joint implantsthreading bone screws thread forms Compatible with many Fast and effective performanceSE-811 81 Sandviken, Swedenwww.sandvik.coromant.comPrinted on recycleable paper. Printed in Sweden, AB Sandvikens Tryckeri. © AB Sandvik Coromant 2010.07