As you know, for sharpening soft steels, bars on hard bonds are used, and for sharpening hard steels, bars on soft bonds. Hard grinding stones, when working "on the grain", provide soft steels with the creation of a hardening zone on the supply around the cutting edge, thereby compacting the metal on the most vulnerable part of the wedge, significantly increasing its resistance to blunting. On knives made of hard steels, this technique does not make sense, since the hardness of the blade is sufficient to provide excellent cutting properties even with prolonged heavy loads on the RC. The main task when sharpening such knives is to realize a high metal removal rate with the lowest possible degree of damage to its structure. Therefore, it is advisable to use stones with soft ligaments. They have a high grain renewal on the working surface of the grain. This guarantees a high speed of the abrasive, and also prevents the violation of the steel matrix and the tearing of carbides from it. A compromise between the hardness of the bond and the ability of the stone to maintain its geometry during sharpening is not always possible to find. Very hard steel grades, over 63-64 HRC, are effectively sharpened on loose grain lapping surfaces using abrasive pastes and slurries. One of the latest developments of British technologists in this area is offered by the leading company in the field of abrasive processing of materials - the company HLAD'Stone.
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