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US 11,267,033 B2Granted
Mold and method for manufacturing drawn can
AssigneeToyo Seikan Group Holdings, Ltd.
InventorsRyozo Shiroishi, Kenichi Takao, Takuho Kumagai
Life of this patent
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Abstract
A mold used for blanking a metal plate to shape a blank to be drawn. The mold has a surface treatment film and a top face to be brought into contact with the metal plate and a peripheral end face communicated indirectly with the top face. At least the top face is coated with the surface treatment film.
Claims9
A mold applicable to blanking of a plate material for shaping a blank to be drawn and to drawing the blank, said mold being an annular mold with a through hole to pass a drawing punch, comprising:
- (i) a top face to be brought into contact with the plate material and a peripheral end face, and wherein
- (ii) a peripheral wall face is provided downward from an outer edge of the top face, the peripheral end face being connected to the top face by the peripheral wall face,
- (iii) a lower end of the peripheral wall face joins the peripheral end face,
- (iv) a corner formed by the peripheral wall face and the outer edge of the top face is rounded,
- (v) a diameter of an outer edge of the peripheral end face and a diameter of an outer edge of the mold are the same, and the diameter of the outer edge of the mold corresponds to a diameter of the blank to be drawn, and
- (vi) at least the top face is coated with a diamond film,
- wherein the outer edge of the peripheral end face is a cutting edge for blanking the plate material.
4 more elements
Dependencies are inferred from the claim text.