EP 0787542 A3 19981028 - Mandrel and mandrel bar for skew-rolling mills
Title (en)
Mandrel and mandrel bar for skew-rolling mills
Title (de)
Walzdorn und Walzstange für Schrägwalzwerke
Title (fr)
Mandrin et tige porte-mandrin pour laminoirs obliques
Publication
Application
Priority
DE 19604969 A 19960202
Abstract (en)
[origin: EP0787542A2] A method for cooling a mandrel (2) and protecting the inner surface of a blank (10) against oxidation comprises: (a) returning the water used for internal cooling of the mandrel and directing it into the space between the bar (1) and the inner surface of the hollow blank to quench the latter from inside; and (b) supplying at the same time the forming zone around the mandrel with an inert gas to prevent oxidation of the blank inner surface within this zone, forming a barrier against water flow into this zone. Also claimed is an inner pipe-forming tool implementing the above method.
IPC 1-7
IPC 8 full level
B21B 25/04 (2006.01)
CPC (source: EP)
B21B 25/04 (2013.01)
Citation (search report)
- [A] US 2159123 A 19390523 - ANATER RAYMOND J
- [A] US 2237983 A 19410408 - STEVENSON FINDLATER
- [A] DE 4004155 A1 19910814 - KOCKS TECHNIK [DE]
- [YA] PATENT ABSTRACTS OF JAPAN vol. 008, no. 132 (M - 303) 20 June 1984 (1984-06-20)
- [DY] PATENT ABSTRACTS OF JAPAN vol. 007, no. 116 (M - 216) 20 May 1983 (1983-05-20)
- [A] PATENT ABSTRACTS OF JAPAN vol. 009, no. 290 (M - 430) 16 November 1985 (1985-11-16)
Designated contracting state (EPC)
DE ES FR GB IT
DOCDB simple family (publication)
EP 0787542 A2 19970806; EP 0787542 A3 19981028; EP 0787542 B1 20031126; DE 19604969 A1 19970807; DE 19604969 C2 20000824; DE 59711039 D1 20040108; ES 2206654 T3 20040516
DOCDB simple family (application)
EP 97250015 A 19970129; DE 19604969 A 19960202; DE 59711039 T 19970129; ES 97250015 T 19970129