MOULD AND DIE INDUSTRY 124 / NORTON WINTER PRECISION TECHNOLOGY TOOL GRINDING DIAMOND AND CBN CUT-OFF WHEELS Diamond cutting wheels are used for efficient cutting of hard, short-chipping and wear resistant materials such as glass, ceramics and carbide. The current trend towards sintered materials has increased the use of diamond cutting wheels. They are successfully used in the food industry and medical science, due to their clean and almost residue-free cutting ability. cBN was developed as an addition to diamond. The specific characteristics of this cutting material permit the machining of high-performance high-speed steel and hardened steel from 55 HRC as well as magnetic materials. The cutting wheels consist of a steel core with the cutting layer on the periphery. The cutting layer in sintered metal, resin or electroplated metal bond contains either diamond or cBN. The combination of bond, type of abrasive, concentration and grit size leads to different tool characteristics which are specified to meet the requirements of different processes and applications. EUROPEAN STANDARD EN 13236:2000 - COMMON MAXIMUM OPERATING SPEEDS FOR CUT-OFF WHEELS BODY CUTTING EDGE (ABRASIVE COATING) APPLICATION MODE GRINDING MODE MAXIMUM OPERATING SPEED IN M/S ACCORDING TO BOND TYPE Resin B Metal M Electroplated G Metal metal blank, e.g. cast, rolled, forged closed mechanically and manually guided cut-off grinding wet cut-off grinding 63 80 80 dry cut-off grinding - 80 80 segmented mechanically and manually guided cut-off grinding wet cut-off grinding - 40 a 50 a - 80 80 dry cut-off grinding - 63 80 closed or segmented manually guided cut-off grinding wet and dry cut-off grinding - 63 b 80 sintered closed mechanically and manually guided cut-off grinding wet cut-off grinding 63 63 - Resin closed mechanically and manually guided cut-off grinding wet and dry cut-off grinding - - a For difficult to machine materials, like e.g. granite, diorite, quartzite, armoured concrete b The abrasive section must be welded or sintered to the core for cut-off wheels for free hand cutting with metal bond abrasive sections
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