Introduction External cyilindrical grinding In SWATYCOMET grinding wheels for grinding of new rolls and renewal of rolls in usage are produced. Our technology and production facilities enable us production of grinding wheels in vitrifid and resinoid bond up to the diameter of 1300 mm. For final grinding of new rolls we recommend two different granulations, a rough and a fine one, whereby the grits used depend on the size of the grinding wheel. Due to different types of bonds implemented grinding wheels can be used at peripheral speeds from 25 to 63 m/s. For special materials such as ASP and WIDIA we produce tools with CBN and DIAMOND abrasives up to the diameter of 600 mm. To achieve targeted grinding results we suggest the usage of dressing tools from our production programme. The shape of ordered grinding wheel is adjusted to the design of the machine or to the specific requirements of the customer. Shape types and dimensions for individual types of grinding machines. Surface grinding and thread center grinding The range of grinding wheel specification The range of grinding wheel specification P ro d u c t i o n o f ro l l s Final grinding 8A54/3IJ7V835 Final grinding Steel T5 DxTxH-PxF T7 DxTxH-PxF/G Sketch of shape SGY C80/3H9V60 Rough grinding Casting 51C16/4R4B18 C120/1H11V60 Steel production H o t m i l l i n g - r e n ewa l o f ro l l s Standard T1 DxTxH Sketch of type 36 Rough grinding Rough S29GC36/2J7BX03 Working rolls Forged rolls S2A46/3K7BM03 Rough grinding S2A60/3J7BM03 Final grinding Casting High stock removal Standard Fine High stock removal Rough grinding C80/2I7V60 S29GC36/2J7BX03 S9C36-60K7BX03 S29GC36-60J7BX03 Grinding of threaded cent er bores in rolls Type / Dimension SGY / DxTxH-V C o l d m i l l i n g – r e n ewa l o f ro l l s Working rolls Back up rolls Standard S2A46/3K7BM03 High stock removal S68C36-60 J-B Standard S2A46/3K7BM03 Quality 18x35 8A120/2L9V835 Type / Dimension Quality 26x38 8A120/2L9V835 36-DxTxH-PxF 8A36/2J8V835 50x39 8A120/2L9V835 S e n d z i m i r ro l l s D (mm) T (mm) 350 38 600 50/60/70/100/125 700 60/80/100/125 750 80/100/125 762 80/100/125 800 80/100/125 304.8/381 900 80/100/150 304.8/355/457.2 920 80/100/127/150 304.8/355/457.2/508 1000 60/75/80/100/127/150 304.8/355/457.2/508 1065 80/100/127 406.4 102B 46-151R100B47S WIDIA working rolls 304.8 2A60/3J7V ASP working rolls 304.8 9C180/9E11BX50/300 Chromium cast rolls 304.8 S29GC100/1F10BX03 Working rolls – fine grinding 203.2/304.8 68C60J-B Working rolls 127 68C60J-B Intermediate rolls H (mm) 68C60J-B Drive rolls 101D 46-151R100B40S Waldrich, Herkules, Landis, Schaudt, Churchill, Fortuna, Farrel, ... Plate 2A60-80 H10/3V35 (standard) Sheet 9C150-180G-H10/3V35 Grinding wheel peripheral s peed Material Infeed – mm/feed Longitudinal feed 45-63 0.25 1000 mm/min Fine 35-50 0.010-0.020 5000 mm/min Renewal grinding Steel m/sec Rough production grinding Casting Type of Grinding 35-40 0.010-0.030 3000 mm/min Rough production grinding 35-63 0.020-0.030 5000 mm/min Fine renewal grinding 25-30 0.002-0.005 3000 mm/min G r i n d i n g o f r u b b ered rolls Hard rubber 8A54-60I7V835 (high stock removal) 2A30/1G13/1V Hard rubber – fine grinding Copper and aluminium mills Machines: Useful suggestions 68C60J-B Back up rolls Di me ns i on s: Thrust bearings 2A54/1G13/1V Soft rubber 1A24/1I7+V Soft rubber – fine grinding C60/1G13/1V Pressure 200-600 l/min (depending on the D of the grinding wheel) 3-5 bar Calender rolls 8A60/1H8/6V Nozzle Minimal T of grinding wheel x 3 mm Cooling: Quantity in l/h SPARKS WORLD

Dressing of Grinding Wheels Useful suggestions PDE Single point dresser PDM Multicrystal diamond PDM-Rolette Diamond rolette (Rotating diamond dresser) Ty pe of dressing t ool Casting Steel Rough production grinding Single point dresser Repair grinding Multicrystal Rough production grinding Multicrystal Final production grinding Multicrystal D r essing of grinding wheel Grinding wheel peripheral speed 25-30 m/sec Infeed 0,05-0,01 mm Longitudinal feed 300-500 mm/min Number of feeds 3-5 S WAT YC O M E T, u m e t n i b r u s i i n n e kov i n e , d . o . o . Titova cesta 60, 2000 Maribor, Slovenia...