The Concept of Centerless Grinding

The Concept of Centerless grinding is a machining process that uses abrasive cutting to remove material from a workpiece.It differs from centered grinding operations in that no spindle or fixture is used to locate and secure the workpiece;

The workpiece is secured between two rotary grinding wheels, and the speed of their rotation relative to each other determines the rate at which material is removed from the workpiece.

Centerless grinding is typically used in preference to other grinding processes for operations where many parts must be processed in a short time.[1]

The workpiece is held between two grinding wheels, rotating in the same direction at different speeds, and a workholding platform.

One wheel, known as the grinding wheel , is on a fixed axis and rotates such that the force applied to the workpiece is directed downward, against the workholding platform.

This wheel usually performs the grinding action by having a higher linear speedthan the workpiece at the point of contact.The other wheel, known as the regulating wheel (moving wheel in the diagram), is movable.

This wheel is positioned to apply lateral pressure to the workpiece, and usually has either a very rough or rubber-bonded abrasive to trap the workpiece.The speed of the two wheels relative to each other provides the grinding action and determines the rate at which material is removed from the workpiece.

During operation the workpiece turns with the Regulating wheel, with the same linear velocity at the point of contact and (ideally) no slipping.

The grinding wheel turns faster, slipping past the surface of the workpiece at the point of contact and removing chips of material as it passes.

The workpiece central should be higher than two wheels (G.W. and R.W.) The height is measured from the workpiece put on the slot which is decided when you already know the processing position. R.W feeding, the height will be increased.

此時重點為調輪位置為工件在刀板往上1/3處的點