US 2006/0125140 A1Published application

Method and apparatus for forming a cup-shaped member

AssigneeJATCO Ltd

InventorKazumi Saitou

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Abstract

A method for forming a cup-shaped member, including a first pressing step of pressing a plate into a first cup-shaped intermediate molded body, and a second pressing step of pressing the first cup-shaped intermediate molded body into a second cup-shaped intermediate molded body having at least one annular bearing surface that extends perpendicular to an axial direction of the second cup-shaped intermediate molded body and are disposed on a radial-inward projection having an increased wall thickness. During the second pressing step, an outer circumferential periphery of the first cup-shaped intermediate molded body is ironed to facilitate plastic flow radially inwardly directed from the inner circumferential periphery thereof by restraining plastic flow directed toward an open end periphery and a bottom thereof.

Claims16

Dependent claims

A method for forming a cup-shaped member, the method comprising:

a first pressing step of pressing a plate into a first cup-shaped intermediate molded body that has a substantially uniform wall thickness;
and
a second pressing step of pressing the first cup-shaped intermediate molded body into a second cup-shaped intermediate molded body, the second cup-shaped intermediate molded body including at least one annular bearing surface that extends perpendicular to an axial direction of the second cup-shaped intermediate molded body, the at least one annular bearing surface being disposed on a radial-inward projection that radially inwardly extends from an inner circumferential periphery of the second cup-shaped intermediate molded body and has an increased wall thickness,
wherein during the second pressing step, an outer circumferential periphery of the first cup-shaped intermediate molded body is ironed to facilitate plastic flow that is radially inwardly directed from the inner circumferential periphery thereof by restraining plastic flow that is directed toward an open end periphery and a bottom of the first cup-shaped intermediate molded body to thereby form the at least one annular bearing surface on the radial-inward projection.

1 more element

An apparatus for forming a cup-shaped member, the cup-shaped member having at least one annular bearing surface that extends perpendicular to an axial direction of the cup-shaped member, the at least one annular bearing surface being disposed on a radial-inward projection that radially inwardly extends from an inner circumferential periphery of the cup-shaped member and has an increased wall thickness, the apparatus comprising:

a first die;
a first punch cooperating with the first die to form a plate into a first cup-shaped intermediate molded body that has a substantially uniform wall thickness;
a second die;
and
a second punch cooperating with the second die to form the first cup-shaped intermediate molded body into a second cup-shaped intermediate molded body, the second punch including at least one annular step surface that extends perpendicular to an axial direction of the second punch and acts to form the at least one annular bearing surface of the cup-shaped member,
the second die and the second punch including open-end side plastic flow restraining portions cooperating with each other to restrain plastic flow that is directed toward an open end periphery of the first cup-shaped intermediate molded body, and bottom side plastic flow restraining portions cooperating with each other to restrain plastic flow that is directed toward a bottom of the first cup-shaped intermediate molded body.

3 more elements

Dependencies are inferred from the claim text.