Patent · US Active

Method for producing high-precision half shells

US8240184B2 · kind B2 · utility

1Cited by

20References

10Claims

0Family size

Assignee

Thyssenkrupp Steel AG · DE

Inventors

Thomas Flehmig · Ratingen, DE
Konstantinos Savvas · Mülheim an der Ruhr, DE

Key dates

Filing date	Apr 6, 2009
Grant date	Aug 14, 2012
Priority date	—
Expiry date	Aug 2, 2030

Classification

Technology area (CPC B)Performing Operations; Transporting
CPC primaryB21D22/22
WIPO fieldMachine tools
WIPO sectorMechanical engineering

Abstract

A method for converting blanks by drawing in a tool with a ram, a die and a pressure pad wherein, converted blanks with high dimensional precision can be produced, includes feeding a blank with a plurality of bulges to the tool. In flange regions of the blank the pressure pad is moved in a first process step of the method into a first position, which corresponds to the height of the bulges of the flange region of the blank added to the blank thickness. In the first process step the blank is preformed in the tool using the ram and in a second process step the pressure pad and the ram are moved into the end positions, so that the blank is converted by the ram to the end form and the pressure pad smoothes the bulges of the flange regions of the blank.

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