# US 11,267,033 B2 · Mold and method for manufacturing drawn can

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- Number: US 11,267,033 B2
- Document ID: US11267033B2
- Status: Granted
- Kind: B2
- Application number: 15/774,076
- Filed: 2016-11-22
- Published: 2018-11-08
- Granted: 2022-03-08
- Earliest claimed: 2015-12-01
- Assignees: Toyo Seikan Group Holdings, Ltd.
- Applicants: Toyo Seikan Group Holdings, Ltd.
- Inventors: Ryozo Shiroishi; Kenichi Takao; Takuho Kumagai
- Web page: https://patentgrep.com/patent/US11267033B2

## CPC

- B21D 22/28: of cylindrical articles using consecutive dies
- B21D 28/14: Dies (ejecting or stripping-off devices arranged in punching machines or tools B21D45/00)
- B21D 37/01: Selection of materials
- B21D 37/205: {Making cutting tools}
- B21D 51/26: cans or tins; Closing same in a permanent manner (making outlet arrangements B21D51/38; welding or soldering B23K)
- B21D: WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL (working or processing of wire B21F)

## 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.

## Claims

### Claim 1

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.

### Claim 2 (depends on 1)

The mold according to claim 1, wherein a groove is formed in a region between the outer edge of the top face and an inner edge of the peripheral end face.

### Claim 3 (depends on 1)

The mold according to claim 1, wherein the top face and the peripheral end face are constituted of separate members.

### Claim 4 (depends on 1)

The mold according to claim 1, wherein the top face has a surface roughness Ra of not more than 0.1 μm.

### Claim 5 (depends on 1)

The mold according to claim 1, wherein the top face and the peripheral end face are coated with the diamond film.

### Claim 6 (depends on 1)

The mold according to claim 1, wherein the top face, the peripheral wall face and the peripheral end face are coated with the diamond film.

### Claim 7 (depends on 6)

The mold according to claim 6, wherein a groove is formed in a circumferential direction on at least one of the peripheral end face and the peripheral wall face.

### Claim 8 (depends on 1)

The mold according to claim 1, wherein the peripheral end face has an outer periphery that is not coated with the diamond film.

### Claim 9 (depends on 1)

A method for manufacturing a drawn can, comprising the steps of:
(i) preparing the mold according to claim 1,
(ii) using the mold as a punch to blank a plate material to form a blank, and
(iii) subsequently using the mold as a die to draw the blank with the drawing punch.