EP 0356743 A3 19910327 - MANDREL ROD FOR TUBE ROLLING MILLS
Title (en)
MANDREL ROD FOR TUBE ROLLING MILLS
Publication
Application
Priority
CH 325488 A 19880831
Abstract (en)
[origin: JPH02104406A] PURPOSE: To obtain a mandrel rod free from strain, light weighted and stable by making a mandrel rod for pipe rolling mill to roll a hollow stock consist of at least two inner and outer pipes. CONSTITUTION: A mandrel rod 1 consists of an outer pipe 2 and a inner pipe 3 coaxial with the outer pipe 2. Between both the pipes 2 and 3, there is an annular clearance 4, into which plastic material is poured. The outer pipe 2 is a rolled pipe made of a high alloy steel, preferably of a chromium alloy, and the outer surface of the pipe is chromium plated so as to be as hard as possible and smooth. The inner pipe 3 is also a rolled pipe made of a plain steel. The inner pipe 3 supports the outer pipe 2 through plastics as a force transmission medium in the annular clearance 4. The annular clearance 4 is completely filled with a thermosetting material which stiffly adheres to the inner surface of the outer pipe 2 and the outer surface of the inner pipe 3.
IPC 1-7
IPC 8 full level
B21B 25/00 (2006.01)
CPC (source: EP US)
B21B 25/00 (2013.01 - EP US)
Citation (search report)
- [X] DE 3429524 A1 19860220 - KOCKS TECHNIK [DE]
- [X] US 2025439 A 19351224 - BENJAMIN BROWNSTEIN
- [X] JP S55103200 A 19800807 - NIPPON KOKAN KK
- [X] US 1989507 A 19350129 - DIESCHER SAMUEL E
- [X] FR 1096089 A 19550608
- [X] FR 822733 A 19380106 - WITKOWITZER BERGB GEWERKSCHAFT
- [X] SU 719720 A1 19800310 - MO I STALI I SPLAVOV [SU]
- [A] US 3918284 A 19751111 - REILEY BERTRAND M, et al
- [A] GB 1162338 A 19690827 - WIGGIN & CO LTD HENRY [GB]
Designated contracting state (EPC)
BE CH DE ES FR GB IT LI NL
DOCDB simple family (publication)
EP 0356743 A2 19900307; EP 0356743 A3 19910327; BR 8904379 A 19900417; CH 679462 A5 19920228; CN 1040747 A 19900328; JP H02104406 A 19900417; US 4956988 A 19900918
DOCDB simple family (application)
EP 89114240 A 19890802; BR 8904379 A 19890831; CH 325488 A 19880831; CN 89106963 A 19890825; JP 21765889 A 19890825; US 39691789 A 19890822