Patent ID: 6096390
Filing Date: 2000-08-01
Classification: B23B,C23C,Y10T

Abstract:
A method of forming a hydrogenated amorphous carbon (DLC) film over an inner surface of a guide bush which is formed substantially in a cylindrical shape and has a center bore through a longitudinal axis thereof, and further includes a tapered outer surface, an inner surface to be in sliding contact with a workpiece and slits provided at one end thereof, and which inner surface holds the workpiece inserted into the center bore rotatably and slidably in the direction of said longitudinal axis near a cutting tool when the guide bush is mounted on an automatic lathe, comprising:disposing the guide bush in a vacuum vessel provided with a gas inlet port and an evacuation port;inserting an electrode, provided with a stepped portion and having an extremity which is smaller than another portion of the electrode, into the center sore forming the inner surface of the guide bush in such a manner that the extremity is positioned near an open end of the inner surface of the guide bush, and the electrode is maintained at a ground potential;introducing a gas, containing carbon, through the gas inlet port into the vacuum vessel after evacuating the vacuum vessel; andproducing a plasma in the vacuum vessel to form the carbon film of hydrogenated amorphous carbon over the inner surface of the guide bush by a plasma CVD method.