Patent ID: 11938559
Assignee: YAMAZAKI MAZAK CORPORATION
Field: Machine tools (Mechanical engineering)
Classification: CPC B | IPC B

Claim 0:
1. A stir pin comprising:
a base end portion configured to be held in a pin holder to be rotatable about a first axis, the base end portion having a maximum outer diameter at an outermost edge about the first axis;
a stirring portion provided to project from a shoulder member to be rotatable with respect to the shoulder member about the first axis together with the base end portion; and
an intermediate portion comprising:
a second portion connected to the stirring portion to be rotatable about the first axis together with the stirring portion and having a second diameter passing through the first axis; and
a first portion provided between and connected to the base end portion and the second portion to be rotatable about the first axis together with the base end portion and the second portion, the first portion having an end surface to which the second portion is connected coaxially with the first portion and which has a maximum diameter passing through the first axis larger than the second diameter, the end surface having a ring-shaped receiving surface configured to receive a material waste generated when the stirring portion performs a friction stirring, the ring-shaped receiving surface having a maximum outer diameter at an outermost edge about the first axis that is equal to or greater than the maximum outer diameter of the base end portion,

wherein the first portion includes a flange that has the end surface.