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US 2023/0147754 A1Published application
Metalworking apparatus and metalworking method
AssigneeH-One Co., Ltd.
InventorHiroaki Iizuka
Life of this patent
Estimating the term…
Abstract
A pressing portion (11) formed in a tapered conical shape pushes away a metallic material of a to-be-opened portion (5) radially outward from the radial center. A portion pushed away (2b) is work-hardened (base-material-hardened) and a density of the plate material (2) increases as compared to that of the other portion of the plate material (2). A radial dimension (c2) of a work-hardened portion at a peripheral edge of the to-be-opened portion (5) is larger than a radial dimension (c1) of the pressing portion (11) (c1<c2).
Claims8
A metalworking apparatus comprising:
- a forging tool configured to work-harden a to-be-opened portion of a workpiece through forging;
- and
- a punching tool configured to form an opening portion in the to-be-opened portion by punching,
- wherein the punching tool has an insertion portion that has a diameter equal to a diameter of the opening portion, and a shoulder portion which is joined to the insertion portion and has a diameter which is larger than a diameter of the insertion portion and increases as the shoulder portion extends toward a proximal end of the punching tool, and
- wherein when forming the opening portion by punching, the punching tool is inserted to such a position that the shoulder portion contacts a work-hardened portion remaining at an inner peripheral edge of the opening portion from an inner side surface.
2 more elements
A metalworking method comprising:
- a forging step of work-hardening a to-be-opened portion of a workpiece through forging;
- and
- a punching step of forming an opening portion in the forged to-be-opened portion of the workpiece by punching.
Dependencies are inferred from the claim text.