DE823790C - Process for the manufacture of bodies containing cavities - Google Patents
Process for the manufacture of bodies containing cavitiesInfo
- Publication number
- DE823790C DE823790C DEB1360A DEB0001360A DE823790C DE 823790 C DE823790 C DE 823790C DE B1360 A DEB1360 A DE B1360A DE B0001360 A DEB0001360 A DE B0001360A DE 823790 C DE823790 C DE 823790C
- Authority
- DE
- Germany
- Prior art keywords
- cores
- containing cavities
- bodies containing
- manufacture
- sintering
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F5/00—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product
- B22F5/10—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product of articles with cavities or holes, not otherwise provided for in the preceding subgroups
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F5/00—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product
- B22F5/10—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product of articles with cavities or holes, not otherwise provided for in the preceding subgroups
- B22F2005/103—Cavity made by removal of insert
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Sliding-Contact Bearings (AREA)
- Powder Metallurgy (AREA)
Description
Die aus Pulvern, z. B. aus :Metall- oder Kohlepulvern, herzustellenden Körper werden bisher in Formen gepreßt, in denen zum Bilden der gewünschten Hohlräume entweder Vorsprünge oder Vertiefungen vorgesehen oder entsprechend ausgebildete Kerne eingelegt sind, worauf sich die Sinterung anschließt. Wenn die Hohlräume des fertigen Körpers ganz oder annähernd ganz umschlossen sein sollen, müssen die Kerne oder Formen mehrteilig ausgebildet oder die Körper selbst in Teilen gepreßt werden, die nachträglich zusammengesetzt werden. Alle diese Verfahren sind umständlich und ergeben insbesondere bei Unterteilung in Teilpreßkörper noch nachträglich Bearbeitungsschwierigkeiten.Those made from powders, e.g. B. from: metal or carbon powders to be produced So far, bodies have been pressed into molds in which to form the desired cavities either projections or depressions are provided or appropriately designed Cores are inserted, followed by sintering. When the cavities of the If the finished body is to be completely or approximately completely enclosed, the cores must or molds formed in several parts or the bodies themselves are pressed in parts, which are subsequently put together. All of these procedures are cumbersome and result in subsequent processing difficulties, especially when subdivided into partial pressed bodies.
Diese Mängel lassen sich gemäß der Erfindung dadurch vermeiden, daß die Kerne von der Pulverinasse vollständig umschlossen werden und als Werkstoff für die Kerne solche Stoffe verwendet werden, die während des Preßvorgangs mindestens vorübergehend in festem Zustand beharren, von dem sie später insbesondere bei der Sinterung in einen flüssigen oder gasförmigen Zustand übergehen, in dem sie gegebenenfalls über die Poren des gepreßten Körpers entweichen oder abgezogen werden können.These deficiencies can be avoided according to the invention in that the cores are completely enclosed by the powder mass and as a material such substances are used for the cores that during the pressing process at least to persist temporarily in a solid state, from which they later especially in the Sintering go into a liquid or gaseous state, in which they optionally can escape or be withdrawn via the pores of the pressed body.
Das Verfahren gemäß der Erfindung ist in der "Zeichnung für eine gesinterte Lagerbuchse mit vollständig umschlossenem Hohlraum erläutert, und zwar zeigt Fig. i den Preßvorgang und Fig. 2 die fertige Lagerbuchse.The method according to the invention is in the "drawing for a sintered Bearing bush explained with a completely enclosed cavity, namely Fig. i the pressing process and FIG. 2 the finished bearing bush.
In die mit einer ringförmigen Vertiefung i versehene Preßform 2 wird ein ringförmiger Kern 3 eingesetzt, der beispielsweise von einem durch Unterkühlung in einen festen Zustand übergeführten Ring aus 01 oder Wasser oder einem geeigneten Gas gebildet ist. In die Form wird das Metallpulver d so eingebracht, daß es den Kernring 3 vollständig umgibt. Darauf wird die Masse mit Hilfe (los Stempels 5 zusammengepreßt. Spätestens leim darauffolgenden Sintern des Preßkörpers wird der feste Zustand des Kernstoffes aufgehoben, der dabei verdampft und durch die Poren des Preßkörpers entweicht oder gegebenenfalls durch Ausblasen oder Absaugen aus dem Innern des Preßkörpers abgezogen wird. Es entsteht somit ein bereits maßhaltiger Preßkörper 6, der ohne weitere Bearbeitung insbesondere zur Verwendung als Lagerbuchse geeignet ist, weil er einen vollständig vom porigen Werkstoff umschlossenen Hohlraum 7 besitzt, der mit Schmieröl gefüllt werden kann und dieses im Betrieb an die Lauffläche abgibt. Die Lagerbuchse gemäß der Erfindung bedarf im Betrieb keiner besonderen Schmierung von außen und hat den weiteren Vorteil, daß die zulässige Drehzahl erhöht werden kann und die Buchse eine längere Lebensdauer erhält.In the compression mold 2 provided with an annular recess i, an annular core 3 is inserted, which is formed, for example, by a ring made of oil or water or a suitable gas, which is converted into a solid state by supercooling. The metal powder d is introduced into the mold in such a way that it completely surrounds the core ring 3. The mass is then pressed together with the aid of the punch 5. At the latest during the subsequent sintering of the pressed body, the solid state of the core material is canceled, which evaporates and escapes through the pores of the pressed body or is optionally removed from the interior of the pressed body by blowing or suction. The result is an already dimensionally stable pressed body 6, which is particularly suitable for use as a bearing bushing without further processing, because it has a cavity 7 completely enclosed by the porous material, which can be filled with lubricating oil and releases it to the running surface during operation according to the invention does not require any special external lubrication during operation and has the further advantage that the permissible speed can be increased and the bushing has a longer service life.
Der Querschnitt des Kerns 3 wird zweckmäßig so gewählt, daß er bei einer während des Preßvorgangs eintretenden Verformung das für den Hohlraum 7 erwünschte Profil ergibt.The cross section of the core 3 is expediently chosen so that it is at a deformation occurring during the pressing process is what is desired for the cavity 7 Profile results.
Claims (2)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEB1360A DE823790C (en) | 1950-01-01 | 1950-01-01 | Process for the manufacture of bodies containing cavities |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEB1360A DE823790C (en) | 1950-01-01 | 1950-01-01 | Process for the manufacture of bodies containing cavities |
Publications (1)
Publication Number | Publication Date |
---|---|
DE823790C true DE823790C (en) | 1951-12-06 |
Family
ID=6952258
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DEB1360A Expired DE823790C (en) | 1950-01-01 | 1950-01-01 | Process for the manufacture of bodies containing cavities |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE823790C (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2690374A1 (en) * | 1992-04-24 | 1993-10-29 | Programme 3 Patent Holdings | Process for the production of a processed product and sintered ceramic material obtained by this process |
-
1950
- 1950-01-01 DE DEB1360A patent/DE823790C/en not_active Expired
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2690374A1 (en) * | 1992-04-24 | 1993-10-29 | Programme 3 Patent Holdings | Process for the production of a processed product and sintered ceramic material obtained by this process |
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