| 摘要 |
PURPOSE: To improve the strength of junction parts in a junction method by which, while at least one of first and second tool 4 and 5 of a junction tool 6 is rotated, a workpiece W made of a plurality of plate materials W1 and W2 superimposed in their thickness direction is nipped between the first and second tools and joined at points. CONSTITUTION: The first tool 4 is provided with a pin 44 protruding from its tip surface 43 along a junction axis X. The second tool 5 is provided with a depression 51 which is depressed at its tip surface 53 along the junction axis X. By the first pin 44 of the first tool 4 and the depression 51 of the second tool 5, the superimposed surface W3 of the softened workpiece W is caulked in the direction of the junction axis X. Further, plastic flow is generated within the workpiece W to agitate the vicinity of the superimposed surface W3. |
