DE549713C - Process for the production of hollow bodies from hard metal alloys - Google Patents
Process for the production of hollow bodies from hard metal alloysInfo
- Publication number
- DE549713C DE549713C DE1930549713D DE549713DD DE549713C DE 549713 C DE549713 C DE 549713C DE 1930549713 D DE1930549713 D DE 1930549713D DE 549713D D DE549713D D DE 549713DD DE 549713 C DE549713 C DE 549713C
- Authority
- DE
- Germany
- Prior art keywords
- core
- production
- metal alloys
- hollow bodies
- hard metal
- 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
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/04—Making non-ferrous alloys by powder metallurgy
- C22C1/05—Mixtures of metal powder with non-metallic powder
- C22C1/051—Making hard metals based on borides, carbides, nitrides, oxides or silicides; Preparation of the powder mixture used as the starting material therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C19/00—Other disintegrating devices or methods
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Food Science & Technology (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacture Of Metal Powder And Suspensions Thereof (AREA)
- Powder Metallurgy (AREA)
Description
Verfahren zur Herstellung von Hohlkörpern aus Haftmetallegierungen Die Herstellung von Hohlkörpern aus Hartmetallegierungen, die bekanntlich meist aus Karbiden hochschmelzender Metalle, gegebenenfalls unter Beigabe von leichter schmelzenden Hilfsmetallen, bestehen, erfolgt bisher in der Weise, daß ein pulverförmiges Ausgangsgemenge unter Benutzung einer der gewünschten Hohlkörpergestalt ähnlichen, aber etwas größeren Kernform zu einem Pulverpreßkörper verdichtet und sodann, unter Einbetten in Kohlepulver, hochgesintert wird. Diese bisher übliche Herstellungsart von Hartmetallhohlkörpern ist nicht frei von Schwierigkeiten, da sich der Pulverpreßkörper durch das beim Hochsintern eintretende Schwinden und Weichwerden, also beim Sintern auf eine Temperatur von etwa i 5oo° C bis dicht unterhalb .des Schmelzpunktes, selbst bei sehr sorgfältiger Durchführung und Überwachung des Sintervorganges leicht verzieht. Die Maßhaltigkeit ist besonders dann erschwert, wenn der aus Hartmetallegierungen herzustellende Hohlkörper eine geringe Wandstärke oder aber verschiedene Wandstärken besitzt.Process for the production of hollow bodies from adhesive metal alloys The production of hollow bodies from hard metal alloys, which is known mostly from carbides of refractory metals, possibly with the addition of lighter melting auxiliary metals, exist, so far in such a way that a powdery Starting batch using one of the desired hollow body shape similar, but the somewhat larger core shape is compressed into a powder compact and then, under Embedding in carbon powder that is highly sintered. This previously common type of production of hard metal hollow bodies is not free from difficulties, since the powder compact due to the shrinkage and softening that occurs during high sintering, i.e. during sintering to a temperature of about 1500 ° C to just below the melting point itself easily warped if the sintering process is carried out and monitored very carefully. The dimensional accuracy is particularly difficult when it is made of hard metal alloys Hollow bodies to be produced have a small wall thickness or different wall thicknesses owns.
Die Erfindung bezweckt, die Herstellung genau maßhaltiger Hohlkörper aus Hartmetallegierungen zu erleichtern, und besteht im wesentlichen darin, daß der Hochsinterungsvorgang des Pulverpreßkörpers unter Benutzung eines aus Kohle, Graphit oder gleichwertigem Stoff bestehenden Kernes vorgenommen wird, auf den der Pulverpreßkörper zum Aufschwinden gebracht wird. Der Kern hat hierbei eine der Höhlung des Fertigerzeugnisses entsprechende Form, so daß beim Einschieben des Kernes in die Höhlung des Pulverpreßkörpers ein Zwischenraum verbleibt und der Pulverpreßkörper beim nachfolgenden Hochsintern durch Aufschwinden zum Anliegen an den Kern gebracht wird. Vor der Durchführung des Sinterungsvorganges wird de: mit einem eingeschobenen Kern versehene Pulverpreßkörper in bekannter Weise in Kohlepulver eingebettet, wobei jedoch nunmehr darauf zu achten ist, daß kein Einbettungspulver zwischen Kern und Hohlkörper fällt. Da der Hohlkörper beim Hochsintern und auch beim nachfolgenden Abkühlen in dem eingelegten Kern eine Abstützung findet, so kann naturgemäß weniger leicht ein Verziehen des gesinterten Hohlkörpers eintreten. Nach eingetretener Allkühlung des gesinterten Hohlkörpers kann dieser leicht vom Kern gelöst werden, da durch die verschiedene Werkstoffbeschaffenheit und vor allem durch den beträchtlich verschiedenen Härtegrad von Hohlkörper einerseits und Kern andererseits keine sonderlich feste Verbindung zwischen diesen beiden Teilen beim Sintern eintritt Um bei der Aufschrumpfung des Hohlkörpers auf den Kern mit Sicherheit ein Reißen der Wandung des Hohlkörpers zu vermeiden, ist es zweckmäßig, nicht einen vollen Kern, sondern einen in -Längsrichtung geschlitzten Hohlkern aus- Kohle, Graphit oder gleichwertigem Stoff zu verwenden, da ein solcher Kern dem 'Schrumpfdruck unter Zusammenziehen auf kleinerem Querschnitt nachgibt. Ein solcher nachgiebiger Kern ist besonders vorteilhaft bei der Herstellung von dickwandigen Hohlkörpern und auch solchen dünnwandigen Hohlkörpern, deren Ausgangswerkstoff beim Hochsintern besonders stark schwindet.The aim of the invention is to produce precisely dimensionally stable hollow bodies to facilitate from hard metal alloys, and consists essentially in that the high-sintering process of the powder compact using one made of coal, Graphite or equivalent material existing core is made on which the Powder compact is made to shrink. The core here has one of the cavities of the finished product corresponding shape, so that when inserting the core in the cavity of the powder compact remains a space and the powder compact brought into contact with the core during the subsequent high sintering by shrinkage will. Before the sintering process is carried out, de: is inserted with a Core-provided powder compacts embedded in a known manner in carbon powder, wherein However, care must now be taken that there is no embedding powder between the core and Hollow body falls. Since the hollow body during high sintering and also during the subsequent If cooling finds support in the inserted core, then naturally less can distortion of the sintered hollow body can easily occur. After all cooling has occurred of the sintered hollow body, this can easily be detached from the core, as through the different material properties and, above all, the considerably different Hardness of the hollow body on the one hand and the core on the other hand not particularly firm The connection between these two parts during sintering occurs during shrinking of the hollow body on the core with certainty a tearing of the wall of the hollow body to avoid, it is convenient not a full core, but rather a hollow core made of carbon, graphite or equivalent, slotted in the longitudinal direction To use fabric, as such a core is subject to the 'shrinkage pressure under contraction yields on a smaller cross-section. Such a resilient core is special advantageous in the production of thick-walled hollow bodies and also thin-walled ones Hollow bodies, the starting material of which shrinks particularly strongly during high sintering.
Claims (1)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE376242X | 1930-01-07 |
Publications (1)
Publication Number | Publication Date |
---|---|
DE549713C true DE549713C (en) | 1932-04-30 |
Family
ID=6344225
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE1930549713D Expired DE549713C (en) | 1930-01-07 | 1930-01-07 | Process for the production of hollow bodies from hard metal alloys |
Country Status (5)
Country | Link |
---|---|
AT (1) | AT125734B (en) |
CH (1) | CH150995A (en) |
DE (1) | DE549713C (en) |
FR (1) | FR708833A (en) |
GB (1) | GB376242A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE750464C (en) * | 1941-02-23 | 1945-01-17 | Process for the production of very thin-walled seamless tubes (e.g. 1/10 mm wall thickness and below) from high-melting metals | |
DE909884C (en) * | 1937-05-16 | 1954-04-26 | Edmund Winnicki | Method and device for the production of tools for pressing shaped work pieces |
DE3005474A1 (en) * | 1980-02-14 | 1981-08-20 | MTU Motoren- und Turbinen-Union München GmbH, 8000 München | METHOD FOR THE POWDER METALLURGICAL PRODUCTION OF COMPONENTS |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2642230A (en) * | 1948-02-25 | 1953-06-16 | Johnson & Company London Ltd A | Process for distributing wax in cemented carbide powders |
DE1209852B (en) * | 1959-09-29 | 1966-01-27 | Ciba Geigy | Process for conditioning pigments |
US3090567A (en) * | 1960-09-19 | 1963-05-21 | Robert J Schafer | Size reduction of metal particles |
DE10118978A1 (en) * | 2001-04-18 | 2002-10-31 | Markus Miller | Grinding aid-free grinding process with grinding additive |
-
1930
- 1930-01-07 DE DE1930549713D patent/DE549713C/en not_active Expired
- 1930-12-31 AT AT125734D patent/AT125734B/en active
-
1931
- 1931-01-01 GB GB56/31A patent/GB376242A/en not_active Expired
- 1931-01-03 CH CH150995D patent/CH150995A/en unknown
- 1931-01-05 FR FR708833D patent/FR708833A/en not_active Expired
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE909884C (en) * | 1937-05-16 | 1954-04-26 | Edmund Winnicki | Method and device for the production of tools for pressing shaped work pieces |
DE750464C (en) * | 1941-02-23 | 1945-01-17 | Process for the production of very thin-walled seamless tubes (e.g. 1/10 mm wall thickness and below) from high-melting metals | |
DE3005474A1 (en) * | 1980-02-14 | 1981-08-20 | MTU Motoren- und Turbinen-Union München GmbH, 8000 München | METHOD FOR THE POWDER METALLURGICAL PRODUCTION OF COMPONENTS |
Also Published As
Publication number | Publication date |
---|---|
CH150995A (en) | 1931-11-30 |
FR708833A (en) | 1931-07-29 |
GB376242A (en) | 1932-07-07 |
AT125734B (en) | 1931-12-10 |
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