DE942814C - Process for increasing the yield strength of sintered metal piston rings - Google Patents

Process for increasing the yield strength of sintered metal piston rings

Info

Publication number
DE942814C
DE942814C DET1907D DET0001907D DE942814C DE 942814 C DE942814 C DE 942814C DE T1907 D DET1907 D DE T1907D DE T0001907 D DET0001907 D DE T0001907D DE 942814 C DE942814 C DE 942814C
Authority
DE
Germany
Prior art keywords
piston rings
yield strength
sintered metal
increasing
metal piston
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
Application number
DET1907D
Other languages
German (de)
Inventor
Dr Bruno Kehl
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Continental Teves AG and Co oHG
Original Assignee
Alfred Teves GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Alfred Teves GmbH filed Critical Alfred Teves GmbH
Priority to DET1907D priority Critical patent/DE942814C/en
Application granted granted Critical
Publication of DE942814C publication Critical patent/DE942814C/en
Expired legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C33/00—Making ferrous alloys
    • C22C33/02—Making ferrous alloys by powder metallurgy

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Powder Metallurgy (AREA)
  • Pistons, Piston Rings, And Cylinders (AREA)

Description

Es ist bekannt, Kolbenringe aus Sintermetall herzustellen. Derartige Ringe haben jedoch den grundsätzlichen Nachteil, daß die Streckgrenze derartiger Ringe sehr niedrig liegt. Es ist bereits versucht worden, die Streckgrenze durch Kaltverformung zu erhöhen,- was jedoch deshalb nicht zum Ziele führte, da eine Streckgrenze von beispielsweise über 2o kg/mm2 nicht erreicht werden konnte.It is known to manufacture piston rings from sintered metal. Such However, rings have the fundamental disadvantage that the yield strength of such Rings very low. Attempts have already been made to push the yield point through To increase cold deformation - which, however, did not lead to the goal, since a yield point of, for example, over 20 kg / mm2 could not be achieved.

Zur Erhöhung der Streckgrenze ist ferner vorgeschlagen worden, das Grundmaterial härter auszubilden., beispielsweise durch Verwendung von Eisenkarbiden. Dieses Verfahren ist insofern nachteilig, als das Pressen und Sintern von Kolbenringen aus derartigem Material sehr schwierig ist.To increase the yield strength it has also been proposed that Base material to be made harder, for example by using iron carbides. This method is disadvantageous in that piston rings are pressed and sintered from such material is very difficult.

Erfindungsgemäß werden Kolbenringe aus Sintermetall zur Erhöhung der Streckgrenze einer an sich bekannten Einsatzbehandlung unterzogen, d. h., es wird durch eine kohlenutoffreiche Umgebung, entweder durch kohlenstoffhaltiges Gas oder einen kohlenstoffhaltigen Salzfluß, durch Diffusion bei höherer Temperatur Kohlenstoff in den Sinterkörper gebracht. Die Streckgrenze wird dadurch auf die für Kolbenringe erforderliche Höhe gebracht.According to the invention, piston rings made of sintered metal are used to increase the Subjected to an application treatment known per se, d. i.e., it will by a carbon-rich environment, either by carbonaceous gas or a carbonaceous salt flux, carbon by diffusion at a higher temperature brought into the sintered body. The yield strength is thereby reduced to that for piston rings required height brought.

Erfindungsgemäß kann die Diffusionsbehandlung mit dem Sinterprozeß verbunden werden, d. h., die Sinterungwird in einer kohlenstoff- oder einer stickstoffreichen Atmosphäre vorgenommen. Um die Lauffläche des Kolbenringes vor der Einwirkung des- Einsatzmittels zu schützen, um eine .weiche Lauffläche zu erhalten, kann erfindungsgemäß die Lauffläche vor der Diffusionsbehandlung abgedeckt werden, beispielsweise durch Einpacken in ein die Lauffläche abdeckendes Rohr.According to the invention, the diffusion treatment with the sintering process be connected, d. that is, the sintering is carried out in a carbon-rich or a nitrogen-rich one Atmosphere made. To protect the running surface of the piston ring from the action of the Protecting use means in order to obtain a .soft running surface can according to the invention the running surface can be covered before the diffusion treatment, for example by Packing in a tube covering the running surface.

Ein Kolbenring gemäß vorliegender Erfindung ist in der Abbildung dargestellt. In Abb. r ist ein Kolbenring aus Sintermetall dargestellt, der nach dem Pressen und Sintern einer Einsatzbehandlung unterworfen wurde; Abb. 2 zeigt das Einpacken von Kolbenringen z in ein Rohr 2.A piston ring according to the present invention is shown in the figure. In Fig. R a piston ring made of sintered metal is shown, which after pressing and sintering has been subjected to insert treatment; Fig. 2 shows the packing of piston rings z into a tube 2.

Claims (3)

PATENTANSPRÜCHE: r. Verfahren zur Erhöhung der Streckgrenze von Kolbenringen aus Sintermetall, dadurch gekennzeichnet, daß der gepreßte und gesinterte Kolbenring einer Einsatzbehandlung unterworfen wird. PATENT CLAIMS: r. Process for increasing the yield strength of piston rings made of sintered metal, characterized in that the pressed and sintered piston ring is subjected to operational treatment. 2. Verfahren nach Anspruch r, dadurch gekennzeichnet, daß die Einsatzbehandhing zugleich finit der Sinterung erfolgt. 2. The method according to claim r, characterized characterized in that the Einsatzbehandhing takes place at the same time finite the sintering. 3. Verfahren nach Anspruch z und 2, da-.durch gekennzeichnet, daß die Lauffläche der Kolbenringe, beispielsweise durch Einpacken in ein entsprechendes Rohr, vor der Einwirkung des Einsatzmittels geschützt wird.3. The method according to claim z and 2, characterized in that the tread of the piston rings, for example by packing them in a suitable tube the effects of the input material is protected.
DET1907D 1942-10-09 1942-10-09 Process for increasing the yield strength of sintered metal piston rings Expired DE942814C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DET1907D DE942814C (en) 1942-10-09 1942-10-09 Process for increasing the yield strength of sintered metal piston rings

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DET1907D DE942814C (en) 1942-10-09 1942-10-09 Process for increasing the yield strength of sintered metal piston rings

Publications (1)

Publication Number Publication Date
DE942814C true DE942814C (en) 1956-05-09

Family

ID=7543598

Family Applications (1)

Application Number Title Priority Date Filing Date
DET1907D Expired DE942814C (en) 1942-10-09 1942-10-09 Process for increasing the yield strength of sintered metal piston rings

Country Status (1)

Country Link
DE (1) DE942814C (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE969574C (en) * 1944-12-13 1958-06-19 Goetzewerke Process for the production of non-round, slotted, self-resilient piston rings from sintered metal
DE1170149B (en) * 1959-02-11 1964-05-14 Heinz Schmalz Dr Ing Process for the powder-metallurgical production of roller bearing races from sintered steel

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE969574C (en) * 1944-12-13 1958-06-19 Goetzewerke Process for the production of non-round, slotted, self-resilient piston rings from sintered metal
DE1170149B (en) * 1959-02-11 1964-05-14 Heinz Schmalz Dr Ing Process for the powder-metallurgical production of roller bearing races from sintered steel

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