AUTOMOBILE SUSPENSION PART AND MANUFACTURING OF THE SAME
First Claim
1. An aluminum alloy automobile suspension part having a through-hole, whereina yield strength of a normal section as a region where a crystal grain is not coarsened is 270 MPa or larger, anda minimum length between a rib end as a predetermined region on a side of the through-hole in a rib and a through-hole end as a predetermined region on a side of the through-hole in a web is 6 mm or larger.
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Accused Products
Abstract
A lightweight automobile suspension part having high strength is an aluminum alloy automobile suspension part having a through-hole, which has a yield strength of a normal section as a region where a crystal grain is not coarsened being 270 MPa or larger, and a minimum length between a rib end as a predetermined region on a side of the through-hole in a rib and a through-hole end as a predetermined region on a side of the through-hole in a web is 6 mm or larger.
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Citations
2 Claims
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1. An aluminum alloy automobile suspension part having a through-hole, wherein
a yield strength of a normal section as a region where a crystal grain is not coarsened is 270 MPa or larger, and a minimum length between a rib end as a predetermined region on a side of the through-hole in a rib and a through-hole end as a predetermined region on a side of the through-hole in a web is 6 mm or larger.
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2. A manufacturing method of an aluminum alloy automobile suspension part having a through-hole, the automobile suspension part having a yield strength of a normal section as a region where a crystal grain is not coarsened being 270 MPa or larger, the method comprising:
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an ingot material preparing step of preparing an ingot material; a heat treatment step of performing heat treatment of the ingot material; a shaping step of shaping the heat-treated ingot material to form a shaped member; a forging step of forging the shaped member; a through-hole forming step of forming a through-hole on the forged shaped member; and a thermal refining step of performing thermal refining of the forged shaped member on which the through-hole is formed, wherein by forming a through-hole forming region as a region where the through-hole is formed in the forging step and removing the through-hole forming region in the through-hole forming step, the automobile suspension part is made so that a minimum length between a rib end as a predetermined region on a side of the through-hole in a rib and a through-hole end as a predetermined region on a side of the through-hole in a web is 6 mm or larger.
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Specification