Instructions use should be strictly observed during the grinding process with diamond wheels.

MACHINE TOOL

Used for grinding with diamond wheels should offer proper working conditions regarding rigidity, rotative speed, and feed speed.

The vibrations occurring between the tool and the part to the be machined bring about an untimely wear of the grinding wheel, influencing also the quality of the processed surface. The axial run-out of a wheel with frontally positioned grinding face should not exceed 0,02mm and the radial run-out of peripheral grinding face wheel should not exceed 0,02mm.

MOUNTING ON THE MACHINE TOOL

Before mounting the diamond tools it is necessary to check up if active zone does not have any crack or detach from the tool body and if reaming is without hitting traces, not being allowed the using of deficient diamond wheel. A visual control is made for detecting a possible deficiency due to the transport and storage.

Mounting instructions:

• the mounting of the tools should be made by a qualified technician;

• the mounting of the tools should be made by means of the gripping flange on the machine spindle; on the broach, in case of internal grinding, or by means of other gripping systems depending on the type of machine tool;

• before mounting, the flanges should be cleaned of any rust or grease, the quality of surface having repercussions on good functioning of the tool;

• the tool reaming should fit to the gripping flange diameter, clearance or forcing not being allowed.

WHEEL GRINDING FACE REGENERATION

Under normal working conditions (correct mounting, adequate machining conditions) grinding wheels run out correctly until the grinding face is entirely worn out.

When these conditions are not strictly observed, particles resulting from cutting operations are deposited on the grinding face which should be regenerated and given the possibility to resume its cutting ability. This is achieved by cleaning of the grinding face:

• by conventional grinding wheel made in green silicon carbide granularity 80-120, hardness JK;

• manually with grinding bars made in the same material.

Regeneration of cubic boron nitride wheels is similarly made using corundum or electrocorindum as abrasive.

PERIPHERAL SPEED

Peripheral speed or cutting rates influences considerably the durability of the diamond grinding wheel, its cutting ability and the quality of the processed surface.

COOLING

When using metal bond diamond wheels it is advisable to operate with a cooling system. As a rule, mist cooling is not sufficient when grinding wheels develop high cutting power. When resin and metal bond grinding wheels are used for tool sharpening dry processing is to be preferred. For the other jobs abundant cooling is increasing the cutting capacity of the wheels.

The most widely used cooling fluids are the oil-water emulsion (1:50).

Cooling of cubic boron nitride wheels is made using oil.