| 摘要 |
PROBLEM TO BE SOLVED: To provide a rotary tool for friction stir which not only secures a desirable processing depth but also performs friction stir in a relatively narrow area and to provide a friction stir processing method using the rotary tool. SOLUTION: This rotary tool for friction stir is provided with a tool body 21 which is nearly pillar-shaped, a tool tip 22 having a conically tapered part 24 which is coaxially disposed on the tip side of the tool body and is tapered, and a groove 25 which is spirally formed on the surface of the conically tapered part of the tool tip and set in such a manner that a peripheral shape in a longitudinal section containing an axial line Lb of the tool body becomes nearly a V-shape. Therein, the groove is set in such a manner that the area of an opposite-inserting side slant face is made to be the area of inserting side slant face or larger, and the rotary tool is used by rotating the tool tip inversely to the screwing direction of the nearly V-shaped groove which is spirally formed.
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