MOULD AND DIE INDUSTRY 134 / NORTON WINTER PRECISION TECHNOLOGY TOOL GRINDING APPLICATION DATA FOR REGRINDING METAL BONDED HONING TOOLS The honing head should be ground to the diameter of the bore to be honed, in order to achieve the shortest possible running-in time after installation, i.e. soldering or gluing the stones to the honing shoes and fixing them to the honing spindle, so that a high percentage contact area is created right from the beginning. SiC grinding wheel – resin bonded, e.g. Ø 200 mm, dry cut (uni-directional at point of contact) Grinding speed (diamond /cBN) vc = 15 m/s Grinding speed (SiC) vc = 23 m/s GRIT SIZE OF DIAMOND AND CBN HONING STICKS SPECIFICATIONS OF THE SIC GRINDING WHEELS D15 / B15 400 HB3 D20 / B30 320 HB3 D46 / B46 240 HB3 D64 / B64 180 HB3 D91 / B91 120 HB3 D126 / B126 80 JB3 D151 / B151 80 JB3 D181 / B181 80 JB3 ORDER EXAMPLE SHAPE L B X X1 R GRIT SIZE BOND CONCENTRATION BZ08B 75 5 2 5 40 D76 BZ387 C75 EXAMPLES OF PROVEN TOOL DESIGNS WORKPIECE Workpiece material Grey cast iron Steel Hardness [HB/HRC] HB 180-220 HRC 62 ±2 Honing tools Pre-honing Finish honing Pre-honing Finish honing Grit size D91 D20B B126 B54 Bond BZ387 BZ387 MSS473 MSS473 Concentration C100 C100 V120 V120 APPLICATION DATA Circumferential speed VA [m/min] 52 52 51 51 Stroke speed VH [m/min] 14 14 18 18 RESULTS Roughness Rt [μm] 5.8 1.8 4.5 2.2 Effective material removal rate MRReff [cm³/min] 0.67 0.2 0.4 0.15 Material removal rate per stick surface MRRLtotal [mm3/mm2 · min] 0.4 0.2 0.58 0.22 Honing ratio G [cm³/cm³] 4.500 3.300 1.200 650 MOULD AND DIE INDUSTRY HONING
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