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Timken rm configs and designs
- 1. Rolling Mill IndustryTraining: RM Configurations & Designs WORLDWIDE LEADER IN BEARINGS AND STEEL
- 2. WORLDWIDE LEADER INBEARINGS AND STEEL Rolling Mill Industry Training Configurations & Designs Work Roll Bearings TQO Thrust Bearings Back-up Roll Bearings Cylindrical Roller Bearings (CRB) TQO TQIT Lubrication Agenda
- 3. WORLDWIDE LEADER INBEARINGS AND STEEL Rolling Mill Industry Training Configurations & Designs Work Roll
- 4. WORLDWIDE LEADER INBEARINGS AND STEEL Rolling Mill Industry Training Configurations & Designs TQOW Work Roll • Two double cones/ two single/ one double cup • Straight bore • Preadjusted with spacers to achieve proper setting • Inner cone spacer piloted & hardened • Lubrication entries in the cup spacers • “Direct” style mounting
- 5. WORLDWIDE LEADER INBEARINGS AND STEEL Rolling Mill Industry Training Configurations & Designs 2TDIW Work Roll • Two double cones/ four single cups • Can be supplied with or without center spacers • Can provides tighter OAW tolerance (822 Code) • All other properties similar to TQO
- 6. WORLDWIDE LEADER INBEARINGS AND STEEL Rolling Mill Industry Training Configurations & Designs Work Roll Typical Mounting • Loose fit cones/ cups for ease of assembly • Cups must be clamped • Cones must be unclamped • Drive Side - Float • Operator Side - Fixed (via keepers) Thrust Ring Split-hinged Ring Threaded Rings Fillet Ring
- 7. WORLDWIDE LEADER INBEARINGS AND STEEL Rolling Mill Industry Training Configurations & Designs Work Roll Chock Sealing • Two seals on inboard side • One seal on outboard side • Additional sealing often used at fillet ring • Seal orientation is critical Fillet Ring ContaminationBearing Oil Grease
- 8. WORLDWIDE LEADER INBEARINGS AND STEEL Rolling Mill Industry Training Configurations & Designs Work Roll Sealed Roll Neck Bearings (SRNB) • Sealed version of standard WR bearings • Provides an additional seal against contaminant ingress & helps to retain grease • Designed to have nearly the same capacity as the unsealed bearing • 2TDI Configuration featuring spiral bore grooves, faces slots and no center spacers • Solid or Relube Cup Spacers
- 9. WORLDWIDE LEADER INBEARINGS AND STEEL Rolling Mill Industry Training Configurations & Designs SRNB Configurations SRNB’s SRNB – Seal Configurations
- 10. WORLDWIDE LEADER INBEARINGS AND STEEL Rolling Mill Industry Training Configurations & Designs Work Roll Work Roll Bending • Used to maintain proper profile (HSM) and flatness (CSM) • Radial load taken by WR bearings • Bearing enhancements may be required Negative Positive
- 11. WORLDWIDE LEADER INBEARINGS AND STEEL Rolling Mill Industry Training Configurations & Designs Work Roll Axial Roll Shifting • Alternate method of flatness/ profile control • Induces thrust on work rolls • Requires an external thrust bearing
- 12. WORLDWIDE LEADER INBEARINGS AND STEEL Rolling Mill Industry Training Configurations & Designs Work Roll • External thrust bearing • Takes thrust in both directions • Inner race keyed to roll neck • Additional radial clearance added over cups • Spring loaded cups (can be integrated into bearing) TDIK
- 13. WORLDWIDE LEADER INBEARINGS AND STEEL Rolling Mill Industry Training Configurations & Designs Work Roll TTDWK • Required for high thrust loads (ex. Structural & Beam mills) • Takes thrust in each direction • Spring loaded outer races • Alternate Double Directional V-Flat Assembly
- 14. WORLDWIDE LEADER INBEARINGS AND STEEL Rolling Mill Industry Training Configurations & Designs Back-up Roll
- 15. WORLDWIDE LEADER INBEARINGS AND STEEL Rolling Mill Industry Training Configurations & Designs TQOW TQITS Back-up Roll CRB
- 16. WORLDWIDE LEADER INBEARINGS AND STEEL Rolling Mill Industry Training Configurations & Designs Back-up Roll Cold Rolling Mills • Thinner gauge product (sheet and foil gauges) • Typically rolled at higher speeds • Final product – requires good flatness/ gauge control • Requires improved bearing/ mill precision
- 17. WORLDWIDE LEADER INBEARINGS AND STEEL Rolling Mill Industry Training Configurations & Designs 4-row CRB - BUR Bearings Back-up Roll RY Type RX Type - Two outer races with triple flanges - Machined bronze cages - Bore Range: 6.3” – 13.8” (160 – 350 mm) - OD Range: 9.0” – 19.6” (230 – 500 mm) - Two single flange outer races - Pin type normally used - Bore Range: 12” – 47” (300 – 1200 mm) - OD Range: 16.5” – 62.5” (420 – 1590 mm) - Also offered with tapered ID (RYK, RXK) - Inner Rings normally customer finished after mounting - Standard envelope tolerance: P6 - Standard running tolerance: P5
- 18. WORLDWIDE LEADER INBEARINGS AND STEEL Rolling Mill Industry Training Configurations & Designs Long Products • Multi-Row Cylindricals (RY Type) • Angular Contact Ball Bearings Bar & Tube Mills
- 19. WORLDWIDE LEADER INBEARINGS AND STEEL Rolling Mill Industry Training Configurations & Designs Back-up Roll 4-row CRB Mounting – Operator Side Thrust Bearing - absorbs external thrust - stabilizes axial roll position Most popular anti-friction BU Roll bearing…high capacity / high precision capability Note: Drive side chock may use locator bearing, such as deep groove ball bearing
- 20. WORLDWIDE LEADER INBEARINGS AND STEEL Rolling Mill Industry Training Configurations & Designs CRB - BUR Bearing Installation • Outer race and roller assemblies are loaded into the chock. • Inner rings are mounted independent of outer ring/ roller sets. • Inner rings are mounted with an interference fit on the roll neck. • Inner rings can be supplied to finished “OD” size or can be finish ground on the roll neck. Back-up Roll
- 21. WORLDWIDE LEADER INBEARINGS AND STEEL Rolling Mill Industry Training Configurations & Designs • Minimizes eccentricity of the Roll Neck to the Roll Body • Minimizes Inner Race Wall Section Variation Contribution to Eccentricity • Provides Tighter Control of Bearing Radial Internal Clearance ( R.I.C. ) • Provides More Consistent Inner Race OD Size Control ( on each neck ) Benefits of Finish Grinding Inner Race OD After Mounting on the Roll Neck Back-up Roll
- 22. WORLDWIDE LEADER INBEARINGS AND STEEL Rolling Mill Industry Training Configurations & Designs Installing the Chock Assembly: • Suggested Mounting Methods: • Chocking/ Dechocking Machine • Piloting Sleeve • Overhead Crane - Care must be taken when using a crane to align the chock prior to installation. • Regardless of mounting method, care must be taken not to damage the inner races during assembly. Back-up Roll
- 23. WORLDWIDE LEADER INBEARINGS AND STEEL Rolling Mill Industry Training Configurations & Designs Key Points for CRB Back-Up Roll Bearings: • Inner Races Stay with Rolls • Outer Assembly Stay with Chocks • Chock Assemblies Interchangeable from Roll to Roll • Inner Race OD’s Can be “Skin Ground” to Extend Useful Life in the Mill (however RIC will be affected) Back-up Roll
- 24. WORLDWIDE LEADER INBEARINGS AND STEEL Rolling Mill Industry Training Configurations & Designs TQITS • Two single, one double cone / four single cups • Tapered bore • Preadjusted with spacers to achieve proper setting • “Indirect” style mounting Back-up Roll
- 25. WORLDWIDE LEADER INBEARINGS AND STEEL Rolling Mill Industry Training Configurations & Designs Back-up Roll • Tight fit cones/ loose fit cups • Cones must be clamped • Float through cups on drive side / Fix cups on operator side • Fillet ring length critical to control fit (Ring Gauge) • Roll neck taper must match cone bore taper (Sine Bar) TQITS Mounting
- 26. WORLDWIDE LEADER INBEARINGS AND STEEL Rolling Mill Industry Training Configurations & Designs Back-up Roll • Hydraulic jack used to push assembly up tight • Inspection hole suggested to check for gap between lead cone & fillet ring TQITS Mounting Device Hydraulic Jack
- 27. WORLDWIDE LEADER INBEARINGS AND STEEL Rolling Mill Industry Training Configurations & Designs Back-up Roll TQITS Hydraulic Removal (“Three-Hole System”)
- 28. WORLDWIDE LEADER INBEARINGS AND STEEL Rolling Mill Industry Training Configurations & Designs Back-up Roll • Similar to mounting used for work rolls • Used for mill speeds less than 2500 fpm • Typically used for lower precision applications (HSM/ Roughing Mill) TQOW Configuration and Mounting
- 29. WORLDWIDE LEADER INBEARINGS AND STEEL Rolling Mill Industry Training Configurations & Designs Back-up Roll Oil Film BUR Bearings
- 30. WORLDWIDE LEADER INBEARINGS AND STEEL Rolling Mill Industry Training Configurations & Designs Lubrication Basic Methods of Lubrication (for Rolling Mill Applications) q Grease q Oil Mist q Air-Oil q Circulating Oil
- 31. WORLDWIDE LEADER INBEARINGS AND STEEL Rolling Mill Industry Training Configurations & Designs q Commonly used for work roll bearing position q TQO & SRNB’s q Applicable to BUR bearings in medium and slow speed mills (<2,500 FPM/250 RPM) q Venting required q Grease fill recommendation: q 30 to 50% of Total Bearing Free Volume q Suggested grease properties: q Base Oil Viscosity @ 40C: 320-460 cSt q Additives: Corrosion and Oxidation Inhibitors, EP Additives q Petroleum Or Synthetic Oil Lubrication Grease
- 32. WORLDWIDE LEADER INBEARINGS AND STEEL Rolling Mill Industry Training Configurations & Designs q Atomized at Mist Generator and conveyed to nozzles q Ideal mist velocity: 12-15 ft/s q Piping sized to achieve desired velocity q Gravity feed required from mist generator q Internal Chock Pressure ≈≈≈≈ 0.75 psi q Venting required for proper distribution of oil q Oil Viscosity should not exceed 460cSt q Air and Oil are typically pre-heated q10% of oil mist may remain airborne (Stray Mist) Lubrication Oil Mist
- 33. WORLDWIDE LEADER INBEARINGS AND STEEL Rolling Mill Industry Training Configurations & Designs Lubrication q Spray-type nozzles recommended q No. of holes in nozzles selected based on desired flow (CFM) q Suggested oil flow rates calculated from: q CFM = DR/14 (Bearings - Rolling Mill Service) q CFM = D/40 (Seals) Oil Mist Nozzles
- 34. WORLDWIDE LEADER INBEARINGS AND STEEL Rolling Mill Industry Training Configurations & Designs a. oil entries b. combination vent and oil level c. oil drainage d. combine vent and oil drainage for inner seal at bottom dead center Lubrication Oil Mist - Chock Schematic
- 35. WORLDWIDE LEADER INBEARINGS AND STEEL Rolling Mill Industry Training Configurations & Designs q Oil transported along inside wall of pipe q Oil distribution cartridges mounted in chock q Not limited to oil viscosity range q Chock’s internal pressure (3-5 psi) helps prevent contaminant ingress q Oil Consumption is ≈≈≈≈ 25% of an oil mist system Lubrication Air-Oil
- 36. WORLDWIDE LEADER INBEARINGS AND STEEL Rolling Mill Industry Training Configurations & Designs Lubrication Air-Oil Delivery OIL FILM OIL/AIR STREAM METERED OIL SUPPLY (cc/HOUR) COMPRESSED AIR
- 37. WORLDWIDE LEADER INBEARINGS AND STEEL Rolling Mill Industry Training Configurations & Designs Lubrication Air-Oil Schematic Mixing Station Air Oil Air-Oil