ALUMINUM ALLOY BOLT AND METHOD FOR MANUFACTURING SAME

Title:

ALUMINUM ALLOY BOLT AND METHOD FOR MANUFACTURING SAME

Document Type and Number:

WIPO Patent Application WO/2021/085627

Kind Code:

A1

Abstract:

An aluminum alloy bolt having a central axis C and comprising: a head portion; an underneck portion extending downward from the head portion; an underneck radiused portion formed between the head portion and the underneck portion, the underneck portion having a threaded portion. In the aluminum alloy bolt, a curvature region is defined which is enclosed by: a lower surface expanding inward and curving in the direction of the head portion from a surface of the underneck portion a certain distance L underneath an R-end on the surface of the aluminum alloy bolt which is the boundary between the underneck portion and the underneck radiused portion; an upper surface provided on the head portion side of the lower surface at a certain distance T from the lower surface; and the surface of the aluminum alloy bolt. An average crystal grain size of first crystal grains of the aluminum alloy of which the curvature region is composed is greater than an average crystal grain size of second crystal grains of the aluminum alloy of which the interior of the underneck portion inward of a threaded portion adjacent region adjacent to the threaded portion is composed.

Inventors:

SHIMOKAWA SHINYA (JP)
UENO MAKOTO (JP)
NISHIMURA TOMOKI (JP)
MORISHITA YUKI (JP)
FUYAMA NOBUYUKI (JP)

Application Number:

PCT/JP2020/040926

Publication Date:

May 06, 2021

Filing Date:

October 30, 2020

Export Citation:

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Assignee:

MATSUMOTO HEAVY IND CO LTD (JP)
HIROSHIMA PREFECTURE (JP)

International Classes:

B21J5/08; B21K1/46; C22F1/00; C22F1/05; C22F1/053; F16B35/00

Foreign References:

JP2018141501A	2018-09-13
JP2012101247A	2012-05-31
JP2011190493A	2011-09-29
JPH101758A	1998-01-06
JP2020132930A	2020-08-31
JP2011190493A	2011-09-29

Other References: