| 摘要 |
PROBLEM TO BE SOLVED: To provide a ball screw and a screw groove machining method therefor capable of obtaining the desired shape of the screw groove and surface roughness, shortening machining time and reducing the cost. SOLUTION: This screw groove machining method for a screw shaft 3 in a shaft circulation type of ball screw 1 includes a process step for turning the screw groove 3a on the screw shaft 3 made up of a raw material and a process step for quenching the turned screw shaft 3. In the turning process step, an end mill 11 with a nose radius R2 smaller than the radius of groove curvature R1 of the screw groove 3a is used. The end mill 11 is moved by the effective length of the screw groove 3a a plurality of times and a travelling path at each time is sequentially displaced in the arc direction of the cross-sectional shape of the screw groove 3a to turn the whole screw groove 3a. This enables the desired shape of the screw groove and surface roughness to be obtained and the molding machining of the screw groove 3a to be completed by one process of point cutting, thereby removing conventional grinding or turning after heat treatment. COPYRIGHT: (C)2009,JPO&INPIT
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