Mold and method for manufacturing drawn can

Patent metadata

Field	Value
Publication number	US-11267033-B2
Application number	US-201615774076-A
Country	US
Kind code	B2
Filing date	Nov 22, 2016
Priority date	Dec 1, 2015
Publication date	Mar 8, 2022
Grant date	Mar 8, 2022

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.

First claim

The invention claimed is:

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.

2. 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.

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

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

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

6. 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.

7. 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.

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

9. 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.

Assignees

• Toyo Seikan Group Holdings Ltd

Inventors

• Shiroishi Ryozo
• Takao Kenichi
• Kumagai Takuho

Classifications

• B21D51/26 Primary

  cans or tins; Closing same in a permanent manner (making outlet arrangements B21D51/38; welding or soldering B23K) · CPC title

• B21D28/14

  Dies (ejecting or stripping-off devices arranged in punching machines or tools B21D45/00) · CPC title

• B21D37/01

  Selection of materials · CPC title

• B21D22/28 Primary

  of cylindrical articles using consecutive dies · CPC title

• B21D37/10

  Die sets; Pillar guides · CPC title