Patent ID: 6699583
Filing Date: 2004-03-02
Classification: B23B,B23P,B23Q,Y10T

Abstract:
A round bar which is rotatably held to be fed in a longitudinal direction thereof by a guide bush fixed to a main body side of a lathing apparatus, and sequentially fed from the guide bush to a machining tool arranged on the main body side, thereby performing lathing of the round bar in a cantilevered state, said round bar having a solid lubricant layer having a predetermined thickness on an outer surface of the round bar in advance to reduce friction in a state of the round bar held by the guide bush, wherein said round bar contains a metal material selected from the group consisting of pure titanium and a titanium alloy and wherein said lubricant layer contains at least one paint selected from the group consisting of a fluoroplastic paint, a molybdenum disulfide paint, a tungsten disulphide paint, a graphite paint, a boron nitride paint, a polyimide paint, a polyamide paint, a PBI (polybenzoimidazole) paint, a silicone paint, a polysulfone paint, a polyether paint, and a polyether ketone paint, wherein said solid lubricant layer has a thickness of 1 to 100 microns, thereby preventing brittle fracture in the round bar held by said guide bush and making an outer diameter tolerance of the round bar fall within a general tolerance.