| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for forming a dynamic pressure generating groove capable of simplifying aligning work for a bearing sleeve to a tool, and achieving a low defective generation ratio. SOLUTION: As a rolling work tool 1 for forming the dynamic pressure generating groove, a work tool 1 having a small diameter shaft part 12 of smaller outer diameter than a support shaft part 11 and a work shaft part 13 is used between the support shaft part 11 and the work shaft part 13. In this constitution, tolerable quantity of deflection between the inner diameter center of a workpiece (sleeve) and the rotation center of the tool 1 is increased. Concentricity of a radial dynamic pressure generating groove formed by rolling work to the sleeve inner diameter is improved. Aligning work between the sleeve and the work tool 1 can thus be simplified. High-precision dynamic pressure bearing parts can be provided. COPYRIGHT: (C)2005,JPO&NCIPI
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