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Chapter: Mechanical - Manufacturing Technology - Abrasive Process and Broaching

Centerless grinding and Internal Grinding

Centerless grinding and Internal Grinding
Centerless grinding is a form of grinding where there is no collet or pair of centers holding the object in place.


Centerless grinding


Centerless cylindrical grinder


A schematic of the centerless grinding process.

Centerless grinding is a form of grinding where there is no collet or pair of centers holding the object in place. Instead, th ere is a regulating wheel positioned on the o pposite side of the object to the grinding wheel. A work rest keeps the object at the appropriate height but has no bearing on its rotary speed. The workblade is angled slightly towa rds the regulating wheel, with the workpiece c enterline above the centerlines of the regul ating and grinding wheel; this means that high spots do not tend to generate corresponding o pposite low spots, and hence the roundness of parts can be improved. Centerless grinding is much easier to combine with automatic load ing procedures than centered grinding; thr oughfeed grinding, where the regulating wheel is held at a slight angle to the part so that ther e is a force feeding the part through the grinder, i s particularly efficient.

 

Internal Grinding


A basic overview of Internal Diameter Cylindrical Grinding. The Curve d Arrows refer to direction of rotation.

 

ID grinding is grinding occurring on the inside of an object. The grinding wheel is always smaller than the width of the object. The object is held in place by a collet, which also rotates the object in place. Just as with OD grinding, the grinding wheel and the object rotated in opposite directions giving reversed direction contact of the two surfaces where the grinding occurs.

 


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