EP 0403038 A3 19910327 - METHOD AND APPARATUS FOR MAKING DIMENSIONALLY STABLE PRESSED ARTICLES
Title (en)
METHOD AND APPARATUS FOR MAKING DIMENSIONALLY STABLE PRESSED ARTICLES
Publication
Application
Priority
DE 3919821 A 19890615
Abstract (en)
[origin: EP0403038A2] The invention relates to a method and an apparatus for making dimensionally stable pressed articles from pulverulent compositions, in particular from metal powder, on a press in a mould under the action of at least one lower die and one upper die, the position of the components carrying the dies and/or of the mould being measured relative to a fixed point and the components carrying the dies being moved, in each case, into a theoretical position relative to each other, these positions corresponding to the theoretical dimensions of the pressed article in the pressing direction, taking into account the lengths of the dies. In order to provide a method, and an apparatus for carrying out the method, by means of which the accuracy of the geometry of the pressed articles can be further improved, even in the case of pressed articles with a plurality of vertical steps, it is proposed that, in the final pressing position, the theoretical position of at least one of the components carrying the dies is corrected, in the pressing direction, by an amount which corresponds to the elastic deformation of the die or dies as a consequence of the action of the compressive force. <IMAGE>
IPC 1-7
IPC 8 full level
B22F 3/02 (2006.01); B30B 11/00 (2006.01); B30B 11/02 (2006.01); B30B 15/18 (2006.01)
CPC (source: EP US)
B22F 3/02 (2013.01 - EP US); B30B 11/005 (2013.01 - EP US); B22F 2999/00 (2013.01 - EP US)
Citation (search report)
- [Y] US 2455823 A 19481207 - TAUBER JOHN A, et al
- [A] GB 1216397 A 19701223 - MARSHALL KEITH
- [A] FR 1068723 A 19540630 - L MORANE ETS
- [AD] DE 2924704 A1 19810115 - DORST KERAMIKMASCH
- [A] GB 1173235 A 19691203 - CINCINNATI SHAPER CO [US]
- [Y] PATENT ABSTRACTS OF JAPAN, Band 9, Nr. 42 (M-359)[1765], 22. Februar 1985; & JP-A-59 183 998 (HITACH) 19-10-1984
- [A] PATENT ABSTRACTS OF JAPAN, Band 7, Nr. 68 (M-201)[1213], 19. März 1983; & JP-A-57 209 798 (TOYOTA) 23-12-1982
Designated contracting state (EPC)
AT CH DE ES FR GB IT LI SE
DOCDB simple family (publication)
EP 0403038 A2 19901219; EP 0403038 A3 19910327; EP 0403038 B1 19930915; AT E94464 T1 19931015; DE 3919821 A1 19901220; DE 3919821 C2 19940407; DE 59002707 D1 19931021; JP H0318499 A 19910128; JP H0780073 B2 19950830; US 5043111 A 19910827
DOCDB simple family (application)
EP 90250137 A 19900528; AT 90250137 T 19900528; DE 3919821 A 19890615; DE 59002707 T 19900528; JP 12527390 A 19900515; US 53756890 A 19900614