EP 3597322 A1 20200122 - PRESS MOLD AND METHOD FOR MANUFACTURING STEEL PIPE
Title (en)
PRESS MOLD AND METHOD FOR MANUFACTURING STEEL PIPE
Title (de)
PRESSFORM UND VERFAHREN ZUR HERSTELLUNG EINES STAHLROHRS
Title (fr)
MOULE DE PRESSE ET PROCÉDÉ DE FABRICATION DE TUYAU EN ACIER
Publication
Application
Priority
- JP 2017049680 A 20170315
- JP 2018008489 W 20180306
Abstract (en)
A press die for use in a steel pipe forming process of bending a plate material to form a preformed body having a U-shaped cross section, pressing the preformed body to form an open pipe, which is a tubular body having a seam gap portion in a longitudinal direction, and thereafter joining the seam gap portion to form a steel pipe. The press die includes a pair of dies. The preformed body is installed in one of the pair of dies such that the other die is opposed to a U-shaped open side of the preformed body, and the preformed body is pressed while the preformed body is held between the pair of dies. A surface of each die to be in contact with the preformed body has an arc portion having a diameter equal or substantially equal to an outer diameter of the steel pipe such that an arc center is located at a position coincident with a bending center of the die. The arc portion in each die has a central angle equal to or larger than 70 degrees, and a total angle of the central angles of the dies is smaller than 360 degrees.
IPC 8 full level
B21D 5/01 (2006.01)
CPC (source: EP KR RU)
B21D 5/01 (2013.01 - KR RU); B21D 5/015 (2013.01 - EP); B21D 22/025 (2013.01 - EP); B21D 35/002 (2013.01 - EP); B21D 37/10 (2013.01 - KR)
Designated contracting state (EPC)
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
Designated extension state (EPC)
BA ME
DOCDB simple family (publication)
EP 3597322 A1 20200122; EP 3597322 A4 20210113; BR 112019018762 A2 20200407; BR 112019018762 B1 20231212; CN 110461488 A 20191115; CN 110461488 B 20210910; JP 6721108 B2 20200708; JP WO2018168563 A1 20191107; KR 102267366 B1 20210618; KR 20190124769 A 20191105; RU 2729804 C1 20200812; WO 2018168563 A1 20180920
DOCDB simple family (application)
EP 18767918 A 20180306; BR 112019018762 A 20180306; CN 201880018273 A 20180306; JP 2018008489 W 20180306; JP 2019505901 A 20180306; KR 20197029199 A 20180306; RU 2019132029 A 20180306