Patent · US Active

Method and device for press-hardening a metallic formed structure

US8839652B2 · kind B2 · utility

3Cited by

5References

9Claims

0Family size

Assignee

BENTELER AUTOMOBILTECHNIK GMBH · DE

Inventors

Kiyohito Kondo · Toyota, JP
Friedrich Bohner · Oerlinghausen, DE
Martin Pohl · Altenbeken, DE
Robert Stockter · Hannover, DE

Key dates

Filing date	Sep 17, 2009
Grant date	Sep 23, 2014
Priority date	—
Expiry date	Dec 5, 2031

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC21D8/02
WIPO fieldMachine tools
WIPO sectorMechanical engineering

Abstract

In a method for press-hardening a metallic formed structure made of a hardenable steel sheet, the steel sheet is heated above a transition temperature Ac3 and then placed in a cooled press having a forming tool with at least one uncooled contour section for forming a region of reduced hardness. Marginal regions of the steel sheet are clamped with a sheet holder arrangement which has an inner sheet holder and an outer sheet holder. The inner sheet holder is hereby located closer to the forming tool than the outer sheet holder. The sheet holder arrangement is configured to slow down flow of the marginal regions into the forming tool. After closing the press tool, the steel sheet is formed in a first forming phase by holding the marginal region with the outer sheet holder and in a subsequent forming phase by holding the marginal region with the inner sheet holder.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.