หินเจียรไร้ศูนย์ (Centerless Grinding Wheels)
In centerless grinding the workpiece is introduced between two wheels, the grinding wheel and the regulating wheel, both rotating in the same direction but at different speeds. At the same time workpiece is supported from below by a fixed work-rest blade. A component of the grinding force, acting in a direction toward the work-rest blade, tends to impart a rotating motion to the workpiece while it is also in contact with the much slower rotating regulating.
Centerless Grinding Wheels
In centerless grinding, the work is supported on a work rest work “blade” between the regulating or “feed” wheel and the grinding wheel, The feed wheel controls and drives the work; the grinding wheel, running at normal speed, does the grinding.
The work is not necessarily perfectly cylindrical but may be tapered or otherwise formed. Frequently, several diameters are ground at once by step dressing the wheel or by spacing two or more wheels on the same wheel spindle (infeed grinding). Most jobs, however, are “through feed” of straight pieces where the work enters on one side of the machine and exits on the other.
There are three types of centerless grinding Method