Plastic and nonmetallic article shaping or treating: processes – Forming articles by uniting randomly associated particles – Stratified or layered articles
Patent
1990-05-24
1991-08-27
Theisen, Mary Lynn
Plastic and nonmetallic article shaping or treating: processes
Forming articles by uniting randomly associated particles
Stratified or layered articles
264120, 419 6, 419 10, 419 38, 419 66, 425 78, 425150, 425167, 425352, 425356, 425412, B29C 4330
Patent
active
050431234
ABSTRACT:
The present invention relates to a method and apparatus for the manufacture of finished parts by the sintering of compacts which are formed as composite moldings of a pulverulent base material and at least one other pulverulent material, particularly different metal powders. The compacts are produced in the manner that at least one of the powder materials is introduced in pourable condition directly alongside of an already pre-compacted part of the compact into the mold which has a shell-shaped matrix and the powder materials are subjected together to final compacting by plug forces acting from on top and on bottom to the size desired for the sintering. In order to improve the traditional method so that moldings with vertically extending separation lines between the individual portions of the composite material can be produced without the previous disadvantages and provide an apparatus on which the compacts can be produced in accordance with this method, at least two powder materials are introduced, one after the other, in pourable condition into the individual regions of the filling volume of the mold which are to be opened, at least one pre-compacting of the powder material already introduced being affected until dimensional stability is obtained before the next powder material is introduced alongside of the pre-compacted material and is pre-compacted in similar manner, and that only then is the joint final compacting effected.
REFERENCES:
patent: 1352457 (1920-09-01), Kempton
patent: 2398227 (1946-04-01), Hubbert
patent: 2509783 (1950-05-01), Richardson
patent: 3166617 (1965-01-01), Munk
patent: 3255278 (1966-06-01), Smith
patent: 3664785 (1972-05-01), Marshall et al.
patent: 4419413 (1983-12-01), Ebihara
Gormanns Theodor
Radewahn Siegfried
Solty Walter
Mannesmann Aktiengesellschaft
Theisen Mary Lynn
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