EP 0327064 A3 19891220 - PROCESS FOR PREPARING ARTICLES BY POWDER METALLURGY, ESPECIALLY ELONGATED ARTICLES SUCH AS RODS, SECTIONS, TUBES OR SUCH

Title (en)

PROCESS FOR PREPARING ARTICLES BY POWDER METALLURGY, ESPECIALLY ELONGATED ARTICLES SUCH AS RODS, SECTIONS, TUBES OR SUCH

Publication

EP 0327064 A3 19891220 (DE)

Application

EP 89101731 A 19890201

Priority

SE 8800365 A 19880205
SE 8800366 A 19880205

Abstract (en)

[origin: EP0327064A2] In a process for producing powder-metallurgical articles, especially elongate articles such as rods, sections, tubes or the like, powder of metal and/or metal alloys of high hardness, especially tool steel powder or high-speed steel powder, is filled into a thin-walled capsule, the capsule is then sealed air-tight, heated and isostatically pressed to produce a blank which is then hot-formed, especially extruded, to give the end product. In a first alternative, the capsule sealed air-tight is first heated to a temperature of more than 1000 DEG C. After the capsule has been fully heated through, it is held for a prolonged period at an elevated temperature. The capsule is then slowly cooled for cold-isostatic pressing before the final forming. Alternatively, the capsule is first cold-isostatically pressed after the air-tight sealing. The pressed blank is then heated to a temperature of more than 1000 DEG C. After the pressed blank has been fully heated through, it is held for a prolonged period at an elevated temperature and is then, either immediately or after prior cooling, hot-formed, especially extruded.

IPC 1-7

B22F 3/12

IPC 8 full level

B21C 23/01 (2006.01); B22F 3/12 (2006.01); B22F 3/20 (2006.01); B22F 5/12 (2006.01)

CPC (source: EP KR US)

B22F 3/1208 (2013.01 - EP US); B22F 3/20 (2013.01 - EP US); B22F 5/00 (2013.01 - KR)

Citation (search report)

[Y] DE 2659433 A1 19770714 - DAVY LOEWY LTD
[Y] GB 1590953 A 19810610 - POWDREX LTD
[A] EP 0165409 A1 19851227 - KLOSTER SPEEDSTEEL AB [SE]
[Y] DE 2419014 B2 19791011
[Y] EP 0252193 A1 19880113 - WORL TECH LIMITED [US]

Designated contracting state (EPC)

AT BE CH DE ES FR GB GR IT LI LU NL SE

DOCDB simple family (publication)

EP 0327064 A2 19890809; EP 0327064 A3 19891220; JP H01287205 A 19891117; KR 890012729 A 19890919; US 4923671 A 19900508

DOCDB simple family (application)

EP 89101731 A 19890201; JP 2597089 A 19890206; KR 890001356 A 19890204; US 30804889 A 19890206