# US 10,478,886 B2 · Stamping method and stamping apparatus

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- Number: US 10,478,886 B2
- Document ID: US10478886B2
- Status: Granted
- Kind: B2
- Application number: 14/567,375
- Filed: 2014-12-11
- Published: 2015-06-25
- Granted: 2019-11-19
- Earliest claimed: 2013-12-20
- Assignees: Toyota Boshoku Kabushiki Kaisha
- Applicants: Toyota Boshoku Kabushiki Kaisha
- Inventors: Kazuyuki Hirata
- Web page: https://patentgrep.com/patent/US10478886B2

## CPC

- B21D 28/16: Shoulder or burr prevention {, e.g. fine-blanking}
- 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 recess is formed in a plate-like workpiece. Then, an inner ejector is engaged with the recess to restrict deformation of a body portion. In this state, a flange is formed in the outer periphery of the workpiece. A processed product portion is then punched out.

## Claims

### Claim 1

A forming method for stamping a workpiece with a stamping apparatus to obtain a processed product from a portion of the workpiece, the processed product having a body portion, an outer peripheral portion formed in an outer periphery of the body portion, and a recess formed in the body portion, the method comprising:
forming the body portion in the workpiece with a die such that the recess is formed in the body portion;
forming ratchets on an inner wall surface of the recess with teeth that are defined on an outer periphery of the die;
engaging, from a lower side of the workpiece, a restraint member with the formed ratchets in the recess to restrict deformation of the formed recess and the formed ratchets of the body portion; and
forming the outer peripheral portion while the restraint member restricts deformation of the formed recess and the formed ratchets of the body portion.

### Claim 2 (depends on 1)

The method according to claim 1, wherein
the forming of the outer peripheral portion includes forming a flange in the outer peripheral portion.

### Claim 3 (depends on 2)

The method according to claim 2, further comprising:
separating the processed product from the workpiece after forming the flange.

### Claim 4 (depends on 1)

The method according to claim 1, wherein
the stamping apparatus includes a first stamping press and a second stamping press, and
the method further comprises:
feeding the workpiece to the first stamping press, wherein
in the first stamping press, the forming of the recess and the forming of the ratchets is performed; and
feeding the workpiece with the formed recess and the formed ratchets to the second stamping press, wherein
in the second stamping press, the engaging of the restraint member with the formed ratchets and the forming of the outer peripheral portion is performed.

### Claim 5 (depends on 4)

The method according to claim 4, wherein
teeth are defined on an outer periphery of the restraint member, and
engaging the teeth of the restraint member with the formed ratchets in the recess to restrict deformation of the body portion during the forming of the outer peripheral portion.