| 摘要 |
PURPOSE:To prevent a face profile from deflecting and improve finishing accuracy in a valve as well as to make a dressing period for a grinding wheel prolongable, by applying a swivel-free type jig to the surface of a head part of the valve with constant pressure, during valve grinding. CONSTITUTION:At the grinding of a face profile of an engine valve 1, this engine valve 1 is rotated after clamping its valve stem part with a rotary chuck, while with a swivel-free type jig 3, a neck part 3b is applied, with constant pressure, to a head part surface 1b of the valve and supported thereon, and a grindstone 4 is applied to a face profile 1c whereby grinding takes place. During operation, deflection of the valve face profile of the engine valve is checked by the neck part 3b of the jig to be rotated together as it is pressed to a surface of the head part. Thus, the deflection and vibration in the head part of the valve is sharply reducible, therefore finishing accuracy on the valve face profile is improved and, what is more, an interval of wheel dressing periods is prolongable.
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