Abrasive material

In a factory, blasting operations should be carried out in a suitable enclosure or room to protect other personnel from injury and nearby machinery from damage. The ‘blast room’ should be provided with an efficient system of exhaust ventilation, preferably of the down-draught type. During the blasting operation super abrasive material rebounds from the surface of the article with a high velocity. Consequently the operator must be given special protective clothing such as gloves, apron and leggings. A helmet supplied with fresh air at a positive pressure is also necessary to protect the blaster from both flying particles and harmful dust.82Materials used as abrasives include both natural minerals and synthetic products. Abrasive materials can be considered as cutting tools with geometrically unspecified cutting edges that are characterized by high hardness, sharp edges, and good cutting ability.

A primary requirement of a good abrasive flow is that it should be very hard; but hardness is not the only requirement of an abrasive. The requirements of a good abrasive are discussed below. The decision to employ a particular abrasive will be based on various criteria relating to workpiece material, specified geometry, and removal conditions.

Cutting fluids should be used wherever possible in grinding to achieve high material removal rates coupled with low wear of the grinding wheel.

Often, it is better to use an appropriate lubricant such as alcohol for synthetic diamond paste, to remaining free or rising up the power of cutting powder of diamond particles, and also to increase the life of velvet coating.