# US 12,109,600 B2 · Press forming method

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- Number: US 12,109,600 B2
- Document ID: US12109600B2
- Status: Granted
- Kind: B2
- Application number: 17/602,093
- Filed: 2019-12-27
- Published: 2022-05-12
- Granted: 2024-10-08
- Earliest claimed: 2019-04-22
- Assignees: Jfe Steel Corporation
- Applicants: Jfe Steel Corporation
- Inventors: Satoshi Sumikawa
- Web page: https://patentgrep.com/patent/US12109600B2

## CPC

- B21D 22/22: with devices for holding the edge of the blanks (B21D22/24 - B21D22/30 take precedence; shaping over a die without external former B21D11/02)
- B21D 22/26: for making peculiarly, e.g. irregularly, shaped articles
- B21D 22/02: Stamping using rigid devices or tools
- B21D 22/20: Deep-drawing (special deep-drawing arrangements in, or in connection with, presses B21D24/00)
- B21D 53/88: other parts for vehicles, e.g. cowlings, mudguards
- B29C 43/02: of articles of definite length, i.e. discrete articles {(B29C35/0227 takes precedence)}
- 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)
- B29C: SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING (making preforms B29B11/00; making laminated products by combining previously unconnected layers which become one product whose layers will remain together B32B37/00 - B32B41/00)

## Abstract

A press forming method forms a press-formed product having a hat-shaped cross section and includes: a first forming process of press-forming a preformed part in which a portion corresponding to web corresponding to a web portion, and a portion corresponding to side wall corresponding to a side wall portion and including a twisted side wall portion of a twisted shape along the longitudinal direction, are formed, the preformed part including a portion corresponding to convex curve corresponding to a convex curved portion; and a second forming process of press-forming the preformed part into the press-formed product. The twisted side wall portion at the first forming process is twisted such that an angle between the twisted side wall portion and the portion corresponding to web is larger on an end portion side than at a center of the portion corresponding to convex curve in the longitudinal direction.

## Claims

### Claim 1

A press forming method of forming a press-formed product including: a web portion; a side wall portion continuous from the web portion; a flange portion continuous from the side wall portion; and a convex curved portion in which the web portion and/or the flange portion is convexly curved in a height direction along a longitudinal direction in side view, wherein a center of a convexly curved arc is located on the flange portion side in side view, the press forming method comprising:
a first forming process of press-forming a blank into a preformed part in which a portion corresponding to a web, and a portion corresponding to a side wall including a twisted side wall portion of a twisted shape along the longitudinal direction, are formed, the preformed part including a portion corresponding to a convex curve; and
a second forming process of press-forming the preformed part into the press-formed product,
wherein the twisted side wall portion of the preformed part press-formed by the first forming process is twisted such that an angle between the twisted side wall portion and the portion corresponding to the web is larger on an end portion side than at a center of the portion corresponding to the convex curve in the longitudinal direction, the angle being measured from below the portion corresponding to the web.

### Claim 2 (depends on 1)

The press forming method according to claim 1, wherein the twisted side wall portion of the preformed part press-formed by the first forming process has a torsion amount T given by a following equation, the torsion amount T being set to be in a range of 10° or larger and 20° or smaller:
T=Δθ×(H/L),
where
Δθ: an angle difference (=θ2−θ1),
θ1: an angle (°) between the twisted side wall portion and the portion corresponding to the web at the center of the portion corresponding to the convex curve in the longitudinal direction,
θ2: an angle (°) between the twisted side wall portion and the portion corresponding to the web at an end portion of the twisted side wall portion in the longitudinal direction,
H: a side wall height (mm) of the twisted side wall portion, and
L: a longitudinal length (mm) of the twisted side wall portion.