HLAD'Stone slurry, F400 grit, is designed for initial and intermediate sharpening of cutting tools made of high hardness steel.
HLAD'Stone slurry, F800 grit, is designed for the finishing stages of sharpening cutting tools made of high hardness steel.
HLAD'Stone slurry, F1200 grit, is designed for the finishing steps of cutting tools made of high hardness steel.
HLAD'Stone ceramocorundum suspensions are modern complex water-based abrasive suspensions of aluminum oxide and silicon dioxide micropowders for sharpening and finishing hard steels on lapping surfaces. Working with such an abrasive gives a much cleaner surface and allows, while maintaining the structural matrix of the metal, to process harder workpieces than with finishing stones of the same grain size. HLAD'Stone slurries can be used on all lapping surfaces, and are particularly effective on wood laps such as balsa. HLAD'Stone suspensions are applied to the working surface of the lap in a thin layer, then it is necessary to allow it to dry a little. Sharpening is carried out by movements “from the grain”. The grit range of HLAD'Stone suspensions covers the sharpening and finishing sectors of processing with a ruler in F400, F800 and F1200 grit according to FEPA. If ultra-fine finishing is required, it is recommended to use SAS HLAD’Stone Ultra Fine suspensions based on natural grain of Arkansas stone for the finish.
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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