US 12,109,601 B2Granted

Method for manufacturing press-formed product

AssigneeNippon Steel Corporation

InventorsShohei Yamazaki, Ryuichi Nishimura, Koichi Hamada, Takuya Oishi, Tohru Yoshida

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Abstract

A method for manufacturing a press-formed product suppresses occurrence of a forming defect such as a crack in a starting material during press forming, and also suppresses occurrence of problems when transferring a starting material during press forming. A manufacturing intermediate is formed by forming, in a flat-sheet shaped blank sheet, a planned outline portion including an undulating shape which is used for forming an outline of an outer circumferential portion of a press-formed product. The flat shape of the blank sheet is maintained in a region from the planned outline portion toward the center of the manufacturing intermediate, or an intermediate stretch-formed portion having a predetermined intermediate forming height is formed in the manufacturing intermediate in the region. A through-hole is formed by piercing a flat portion at which the flat shape is maintained or a stretch-formed-side top portion of the intermediate stretch-formed portion.

Claims12

Dependent claims

A method for manufacturing a press-formed product, comprising:

forming a manufacturing intermediate by forming a planned outline portion including an undulating shape in a flat-sheet shaped blank sheet, as a planned portion for an outline portion which forms an outline of an outer circumferential portion of the press-formed product;
maintaining a flat shape of the blank sheet in a region from the planned outline portion toward a center of the manufacturing intermediate, or forming an intermediate stretch-formed portion having a predetermined intermediate forming height in the manufacturing intermediate in a region from the planned outline portion toward a center of the manufacturing intermediate;
piercing a flat portion and forming a through-hole while maintaining the flat shape of the flat portion or piercing a stretch-formed-side top portion of the intermediate stretch-formed portion and forming a through-hole;
and
after the through-hole is formed in the flat portion, forming the flat portion into a stretch-formed portion of a predetermined height, or, after the through-hole is formed in the intermediate stretch-formed portion, forming the intermediate stretch-formed portion into the stretch-formed portion of the predetermined height that is greater than the predetermined intermediate forming height.

2 more elements

Dependencies are inferred from the claim text.

Facts

Application: 17/632,805Filed 6 Aug 2020
Priority: JP 2019-1443666 Aug 2019
Published: US 2022/0274150 A11 Sep 2022
Granted: 8 Oct 2024
Term ends: Not estimatedThe source records don’t support an estimate.

Classification8 codes

B21D 22/26
Deep-drawing: for making peculiarly, e.g. irregularly, shaped articles
B21D 22/22
Deep-drawing: with devices for holding the edge of the blanks
B21D 28/26
Perforating, i.e. punching holes: in sheets or flat parts
B62D 25/105
Bonnets or lids , e.g. for trucks, tractors, busses, work vehicles: for motor cars

Family

US 2022/0274150 A1Pre-grant publication · published 1 Sep 2022
US 12,109,601 B2This patent

From the US filing history. Foreign family members aren’t listed.

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