Method for manufacturing bottomed cylindrical body

Patent metadata

Field	Value
Publication number	US-2023122197-A1
Application number	US-202117907484-A
Country	US
Kind code	A1
Filing date	Mar 10, 2021
Priority date	Mar 27, 2020
Publication date	Apr 20, 2023
Grant date	—

Abstract

Provided is a manufacturing method of a bottomed cylindrical body, which can achieve both severe can making processing such as conventional drawing and ironing, and cost reduction and environmental load reduction in a washing step. A manufacturing method of a bottomed cylindrical body includes a drawing step of drawing a metal sheet by use of forming members each of which has a hardness of Hv 1500 to 12000 at its processing surface, and an ironing step of ironing a workpiece into the bottomed cylindrical body via a coolant by use of forming members each of which has a carbon film at its processing surface, and the coolant is a water-soluble coolant or a coolant having a boiling point of lower than 300° C., or a manufacturing method of a bottomed cylindrical body includes a drawing step of drawing a metal sheet by use of a drawing die, which has a hardness of more than Hv 1500 to 12000 at its processing surface, and a drawing punch, which has a hardness of Hv 1000 to 12000 at its processing surface, and an ironing step of ironing a workpiece into the bottomed cylindrical body via a coolant by use of forming members each of which has a hardness of Hv 1500 to 12000 at its processing surface, and the coolant satisfies at least any one of (a) a coolant of lower than 4.0 vol. % concentration of contained oil, (b) a water-soluble coolant, and (c) a coolant having a boiling point of lower than 300° C.

First claim

1 . A manufacturing method of a bottomed cylindrical body, comprising:
a drawing step of drawing a metal sheet by use of forming members each of which has a hardness of more than Hv 1500 to 12000 at a processing surface thereof; and an ironing step of ironing a workpiece into the bottomed cylindrical body via a coolant by use of forming members each of which has a carbon film at a processing surface thereof, wherein the coolant is a water-soluble coolant and/or a coolant having a boiling point of lower than 300° C.

2 . The manufacturing method according to claim 1 , wherein the bottomed cylindrical body is a seamless can body.

3 . The manufacturing method according to claim 1 , wherein the metal sheet is an aluminum alloy.

4 . The manufacturing method according to claim 1 , wherein the carbon film is a diamond film.

5 . The manufacturing method according to claim 1 , further comprising:
before the drawing step of drawing the metal sheet, a lubricant application step of applying, to the metal sheet, a water-soluble lubricant and/or a lubricant having a boiling point of lower than 300° C., wherein the hardness of the processing surface of each forming member in the drawing step is Hv 1500 to 12000.

6 . The manufacturing method according to claim 1 , wherein the coolant contains a preservative and/or a corrosion inhibitor.

7 . The manufacturing method according to claim 1 , further comprising:
a washing step of removing a lubricant and/or the coolant attached on a surface of the bottomed cylindrical body.

8 . The manufacturing method according to claim 1 , further comprising:
a purification step of purifying effluent discharged in the ironing step and/or a washing step.

9 . A manufacturing method of a bottomed cylindrical body, comprising:
a drawing step of drawing a metal sheet by use of a drawing die, which has a hardness of more than Hv 1500 to 12000 at a processing surface thereof, and a drawing punch, which has a hardness of Hv 1000 to 12000 at a processing surface thereof; and an ironing step of ironing a workpiece into the bottomed cylindrical body via a coolant by use of forming members each of which has a hardness of Hv 1500 to 12000 at a processing surface thereof, wherein the coolant satisfies at least any one of (a) a coolant of lower than 4.0 vol % concentration of contained oil, (b) a water-soluble coolant, and (c) a coolant having a boiling point of lower than 300° C.

10 . The manufacturing method according to claim 9 , wherein the bottomed cylindrical body is a seamless can body.

11 . The manufacturing method according to claim 9 , wherein the metal sheet is an aluminum alloy.

12 . The manufacturing method according to claim 9 ,
wherein a carbon film is formed on the processing surface of each forming member in the drawing step, and/or on the processing surface of each forming member in the ironing step.

13 . The manufacturing method according to claim 9 , further comprising:
before the drawing step, a lubricant application step of applying a lubricant to surfaces of the metal sheet, wherein the hardness of the processing surface of the drawing die in the drawing step is Hv 1000 to 12000.

14 . The manufacturing method according to claim 9 , further comprising:
a purification step of purifying effluent discharged in the ironing step or a washing step after the ironing step.

Assignees

• Toyo Seikan Group Holdings Ltd

Inventors

• Shiroishi Ryozo
• Matsumoto Naoya
• Shimamura Masahiro
• Kumagai Takuho
• Ogawa Tomohiro

Classifications

• B21D22/28 Primary

  of cylindrical articles using consecutive dies · CPC title

• B21D22/286 Primary

  with lubricating or cooling means · CPC title

• B21D51/2669

  Transforming the shape of formed can bodies; Forming can bodies from flattened tubular blanks; Flattening can bodies · CPC title

• B21D35/005

  characterized by the material of the blank or the workpiece (B21D26/053 takes precedence) · CPC title

• B21D35/007

  Layered blanks (B21D22/203 takes precedence; joining superposed plates B21D39/031, B21D39/034, B21D39/035) · CPC title