Global Patent Index - EP 0356743 A3

EP 0356743 A3 19910327 - MANDREL ROD FOR TUBE ROLLING MILLS

Title (en)

MANDREL ROD FOR TUBE ROLLING MILLS

Publication

EP 0356743 A3 19910327 (DE)

Application

EP 89114240 A 19890802

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

B21B 25/00

IPC 8 full level

B21B 25/00 (2006.01)

CPC (source: EP US)

B21B 25/00 (2013.01 - EP US)

Citation (search report)

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