US 2015/0089813 A1Published application

Method of hydroforming of hollow structural component

AssigneeHonda Motor Co., Ltd.

InventorsHajime YAMADA, Eri NISHIKATA, Yasuhiro TAKADA

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Abstract

Hydroforming into a hollow structural component by pressing a joined plate member outwardly. A largest width is set to an area of a blank portion of the joined plate member extending to between outer peripheral portions of the recessed spaces from a longest constant portion of an internal space formed by the recessed spaces, the longest constant portion being constant in its inner circumferential length and extending the longest in the internal space. A width of an area of the blank portion extending to between the outer peripheral portions from a portion shorter than the longest constant portion is set such that the smaller the length of the portion which is shorter than the longest constant portion is compared to the longest constant portion. The smaller the width of the area extending from the shorter portion is compared to the width of the area extending from the longest constant portion.

Claims20

Dependent claims

A method of hydroforming of a hollow structural component, comprising:

placing a joined plate member, made by superimposing stainless steel members on each other and joining outer peripheral portions thereof together, between a pair of female dies which have recessed spaces formed therein, respectively, and are arranged with open sides of the recessed spaces facing each other;
supplying a fluid pressure into the joined plate member so that the joined plate member is pressed outwardly, to thereby shape the joined plate member into the hollow structural component having a shape corresponding to the recessed spaces;
forming a main expansion portion of the joined plate member into the shape corresponding to the recessed spaces by being pressed outwardly by the fluid pressure and placing inside an internal space formed inwardly of outer peripheral portions of the recessed spaces, and locating a blank portion of the joined plate member on an outer perimeter side of the main expansion portion by placing between the outer peripheral portions of the recessed spaces;
extending a width of an area of the blank portion to between the outer peripheral portions of the recessed spaces from a longest constant portion of the internal space which is constant in inner circumferential length and extends the longest in the internal space is set to be the largest, and extending a width of an area of the blank portion to between the outer peripheral portions of the recessed spaces from a portion shorter than the longest constant portion is set such that the smaller a length of the portion which is shorter than the longest constant portion is compared to the longest constant portion, the smaller the width of the area of the blank portion extending from the shorter portion is compared to the width of the area of the blank portion extending from the longest constant portion;
and
setting a clearance between the outer peripheral portions of the recessed spaces to be larger than a thickness of the blank portion.

3 more elements

A method of hydroforming of a hollow structural component, comprising:

providing a pair of female dies with recessed spaces formed therein, respectively, said pair of female dies being arranged with open sides of recessed spaces facing each other;
placing a joined plate member with outer peripheral portions thereof joined together, between said pair of female dies;
closing the pair of female dies;
supplying a fluid pressure into the joined plate member so that the joined plate member is pressed outwardly, to thereby shape the joined plate member into the hollow structural component having a shape corresponding to the recessed spaces;
forming a main expansion portion of the joined plate member into the shape corresponding to the recessed spaces by being pressed outwardly by the fluid pressure and placing inside an internal space formed inwardly of outer peripheral portions of the recessed spaces, and locating a blank portion of the joined plate member on an outer perimeter side of the main expansion portion by placing between the outer peripheral portions of the recessed spaces;
extending a width of an area of the blank portion to between the outer peripheral portions of the recessed spaces from a longest constant portion of the internal space which is constant in inner circumferential length and extends the longest in the internal space is set to be the largest, and extending a width of an area of the blank portion to between the outer peripheral portions of the recessed spaces from a portion shorter than the longest constant portion is set such that the smaller a length of the portion which is shorter than the longest constant portion is compared to the longest constant portion, the smaller the width of the area of the blank portion extending from the shorter portion is compared to the width of the area of the blank portion extending from the longest constant portion;
and
setting a clearance between the outer peripheral portions of the recessed spaces to be larger than a thickness of the blank portion.

5 more elements

Dependencies are inferred from the claim text.