EP0226729A1 - Method for producing a hardened non-magnetisable rolling bearing member from an austenitic material and rolling bearing member so produced - Google Patents

Method for producing a hardened non-magnetisable rolling bearing member from an austenitic material and rolling bearing member so produced Download PDF

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Publication number
EP0226729A1
EP0226729A1 EP86113601A EP86113601A EP0226729A1 EP 0226729 A1 EP0226729 A1 EP 0226729A1 EP 86113601 A EP86113601 A EP 86113601A EP 86113601 A EP86113601 A EP 86113601A EP 0226729 A1 EP0226729 A1 EP 0226729A1
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Prior art keywords
rolling bearing
bearing component
roller bearing
produced
bearing member
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EP86113601A
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German (de)
French (fr)
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EP0226729B1 (en
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Karl-Ludwig Dipl.-Ing. Grell
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INA Waelzlager Schaeffler OHG
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INA Waelzlager Schaeffler OHG
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    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
    • C23C8/06—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases
    • C23C8/08—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases only one element being applied
    • C23C8/20—Carburising
    • C23C8/22—Carburising of ferrous surfaces
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/40—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for rings; for bearing races

Definitions

  • the invention relates to a method for producing a hardened, non-magnetizable roller bearing component consisting of an austenitic material.
  • Such rolling bearing components are e.g. used in electromechanical devices in places where the magnetic flux should be interrupted. They are also required because of their high resistance to corrosion.
  • a method for producing rolling bearing components of this type is already known, which provides for the hardness of the rolling bearing component to be increased by work hardening.
  • the known method is only of limited use, since work hardening, which leads to hardnesses of more than 450 HV, leads to the formation of forming martensite in the structure of the rolling bearing component, which makes it magnetisable, for applications in which non-magnetisable rolling bearing components are required to have a higher load capacity is no longer usable.
  • non-magnetizable rolling bearing components produced by the known method have only about 25% of the load capacity of comparable conventional rolling bearing components.
  • the present invention is therefore based on the object of providing a method of the type mentioned at the outset which makes it possible to produce rolling bearing components made of austenitic material which, while maintaining their non-magnetizability, have a load capacity comparable to rolling bearing components made of rolling bearing steel.
  • this object is achieved in that the near-surface material layer of the roller bearing component is carburized at high temperature in an oxygen-free atmosphere and the roller bearing component is then cooled.
  • the oxygen-free atmosphere can contain any carburizing gaseous substances.
  • a structure is formed in the surface area of the rolling bearing component, which consists of a phase rich in cementite, which is comparable in terms of metal and crystallography to Ledeburit and largely non-magnetizable and can have a hardness of up to 700 HV.
  • the core area of the component consists of the austenitic starting material.
  • roller bearing components produced by the process according to the invention surprisingly retain their strength and hardness up to temperatures of 600 ° C., so that they are not only suitable for applications in which an unmagnetizable rolling bearing is required, but also for such applications, that require a high temperature resistance of the rolling bearing.
  • roller bearings made from roller bearing components produced by the method according to the invention are suitable for those applications in which roller bearings interact with adjacent components made of aluminum alloys, since the thermal expansion coefficient of austenitic materials corresponds to that of aluminum alloys. The fitting problems that occur in conventional roller bearings due to the different thermal expansion coefficients can thus be avoided by using roller bearing components produced by the method according to the invention.
  • the rolling bearing component is carburized in an oxygen-free atmosphere which contains CH4 or C3H8 or a mixture of both.
  • Rolling bearing components with a hardness of more than 700 HV can be produced if the oxygen-free atmosphere contains atomic nitrogen according to an embodiment of the invention. It then diffuses nitrogen into the near-surface material layer of the rolling bearing component, which forms nitrides there, which further increase the hardness of the near-surface structure.
  • a particularly uniform structure of the near-surface material layer of the roller bearing component is achieved if, according to one embodiment of the invention, the roller bearing component is carburized at temperatures between 800 and 1000 ° C., but preferably between 880 and 960 ° C.
  • roller bearing component produced by the method according to the invention meets the requirements to a particularly high degree if the carbon content in the near-surface material layer according to one embodiment of the invention is at least 1.5% and the roller bearing component according to a further embodiment of the invention, has a surface hardness of at least 550 HV.
  • the rolling bearing component produced by the method according to the invention consists of one of the austenitic materials ⁇ 5 CrNi 18 9, ⁇ 12 CrNiS 18 8, ⁇ 12 CrNi 17 7 or ⁇ 10 CrNiTi 18 9, which, as has been shown, for the method according to the invention are particularly suitable.
  • roller bearing component made of an austenitic material which has a hardness in its material layer close to the surface which is sufficient for the typical roller bearing stresses and which is nevertheless non-magnetizable.
  • the roller bearing component produced by the method according to the invention has high heat resistance and also has increased corrosion resistance compared to conventional roller bearing components.
  • the rolling bearing component produced by the method according to the invention can interact with components consisting of aluminum alloys without fitting problems, since both have approximately the same coefficient of thermal expansion.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Rolling Contact Bearings (AREA)
  • Solid-Phase Diffusion Into Metallic Material Surfaces (AREA)

Abstract

Ein Verfahren zur Herstellung eines gehärteten, aus einem austenitischen Werkstoff bestehenden unmagnetisierbaren Wälzlagerbauteils erlaubt es, Wälzlagerbauteile aus austenitischem Werkstoff herzustellen, die unter Beibehaltung ihrer Unmagnetisierbarkeit eine mit aus Wälzlagerstahl bestehenden Wälzlagerbauteilen vergleichbare Belastbarkeit aufweisen, indem die oberflächennahe Werkstoffschicht des Wälzlagerbauteils bei hoher Temperatur in einer sauerstofffreien Atmosphäre aufgekohlt und des Wälzlagerbauteil anschließend abgekühlt wird.A method for producing a hardened, non-magnetizable roller bearing component made of an austenitic material makes it possible to produce roller bearing components made of austenitic material which, while maintaining their non-magnetizability, have a load-bearing capacity comparable to roller bearing components made of roller bearing steel, in that the material layer of the roller bearing component near the surface is exposed to oxygen at high temperature Atmosphere is carburized and the rolling bearing component is then cooled.

Description

Die Erfindung betrifft ein Verfahren zur Herstellung eines gehärteten, aus einem austenitischen Werkstoff bestehenden unmagnetisierbaren Wälzlager­bauteils.The invention relates to a method for producing a hardened, non-magnetizable roller bearing component consisting of an austenitic material.

Derartige Wälzlagerbauteile werden z.B. in elektromechanischen Geräten an Stellen verwendet, wo der magnetische Fluß unterbrochen sein soll. Sie werden außerdem wegen ihrer hohen Korrisionsbeständigkeit benötigt.Such rolling bearing components are e.g. used in electromechanical devices in places where the magnetic flux should be interrupted. They are also required because of their high resistance to corrosion.

Es ist bereits ein Verfahren zur Herstellung derartiger Wälzlagerbauteile bekannt, das vorsieht, das Wälzlagerbauteil durch Kaltverfestigung in seiner Härte zu steigern. Das bekannte Verfahren ist jedoch nur bedingt brauchbar, da Kaltverfestigungen, die zu Härten von mehr als 450 HV führen, die Bildung von Umformmartensit im Gefüge des Wälzlagerbauteils nach sich ziehen, wodurch dieses magnetisierbar wird, für Anwendungen, in denen unmagnetisierbare Wälzlagerbauteile höherer Belastbarkeit benötigt werden, also nicht mehr brauchbar ist. Infolge der nur geringen erzielbaren Härte weisen nach dem bekannten Verfahren hergestellte unmagnetisier­bare Wälzlagerbauteile nur ca. 25 % der Belastbarkeit vergleichbarer her­kömmlicher Wälzlagerbauteile auf.A method for producing rolling bearing components of this type is already known, which provides for the hardness of the rolling bearing component to be increased by work hardening. However, the known method is only of limited use, since work hardening, which leads to hardnesses of more than 450 HV, leads to the formation of forming martensite in the structure of the rolling bearing component, which makes it magnetisable, for applications in which non-magnetisable rolling bearing components are required to have a higher load capacity is no longer usable. As a result of the low hardness that can be achieved, non-magnetizable rolling bearing components produced by the known method have only about 25% of the load capacity of comparable conventional rolling bearing components.

Man hat zwar schon versucht, durch Wärmebehandlungsverfahren unmagne­tisierbare Wälzlagerbauteile höherer Belastbarkeit herzustellen, jedoch waren die erhaltenen Wälzlagerbauteile stets magnetisierbar und/oder wiesen nicht die erforderliche Härte auf.Attempts have already been made to manufacture non-magnetisable rolling bearing components of higher load capacity by means of heat treatment processes, however the rolling bearing components obtained were always magnetizable and / or did not have the required hardness.

Dies hat dazu geführt, daß man in der Praxis quasi unmagnetisierbare Wälzlagerbauteile ausreichender Belastbarkeit dadurch zu realisieren ver­sucht, daß man z. B. vergleichsweise dünnwandige Laufbahnen aus ge­härteten ferromagnetischen Werkstoffen auf massive Bauteile aus auste­nitischen Werkstoffen aufsetzt. Diese Lösungen sind aber in der Regel nur ein Notbehelf und vermögen in technischer Hinsicht nicht zu befriedigen. Sie sind außerdem mit erheblichen Kosten verbunden.This has led to attempts in practice to implement quasi non-magnetizable rolling bearing components of sufficient load-bearing capacity in that, for. B. comparatively thin-walled raceways made of hardened ferromagnetic materials on massive components made of austenitic materials. However, these solutions are usually only a makeshift solution and are unsatisfactory from a technical point of view. They are also associated with considerable costs.

Der vorliegenden Erfindung liegt daher die Aufgabe zugrunde, ein Ver­fahren der eingangs genannten Art zu schaffen, das es erlaubt, Wälzlager­bauteile aus austenitischem Werkstoff herzustellen, die unter Beibehaltung ihrer Unmagnetisierbarkeit eine mit aus Wälzlagerstahl bestehenden Wälz­lagerbauteilen vergleichbare Belastbarkeit aufweisen.The present invention is therefore based on the object of providing a method of the type mentioned at the outset which makes it possible to produce rolling bearing components made of austenitic material which, while maintaining their non-magnetizability, have a load capacity comparable to rolling bearing components made of rolling bearing steel.

Nach der Erfindung wird diese Aufgabe dadurch gelöst, daß die ober­flächennahe Werkstoffschicht des Wälzlagerbauteils bei hoher Temperatur in einer sauerstofffreien Atmosphäre aufgekohlt und das Wälzlagerbauteil anschließend abgekühlt wird. Dabei kann die sauerstofffreie Atmosphäre beliebige aufkohlende gasförmige Stoffe enthalten.According to the invention, this object is achieved in that the near-surface material layer of the roller bearing component is carburized at high temperature in an oxygen-free atmosphere and the roller bearing component is then cooled. The oxygen-free atmosphere can contain any carburizing gaseous substances.

Durch die erfindungsgemäßen Verfahrensschritte entsteht im Oberflächen­bereich des Wälzlagerbauteils ein Gefüge, das aus einer zementitreichen Phase besteht, die metallkundlich und kristallographisch mit Ledeburit ver­gleichbar und weitgehend unmagnetisierbar ist und eine Härte von bis zu 700 HV aufweisen kann. Der Kernbereich des Bauteils besteht aus dem austenitischen Ausgangswerkstoff. Vorausgesetzt, das Wälzlagerbauteil wird über eine ausreichend lange, vom jeweiligen Bauteil und Anwendungs­fall abhängige Zeitdauer erfindungsgemäß behandelt, weist der gehärtete Oberflächenbereich des Wälzlagerbauteils eine Dicke auf, die trotz des relativ weichen austenitischen Kernbereichs des Wälzlagerbauteils sicher­stellt, daß dieses den an Wälzlagerbauteile überlicherweise gestellten Be­lastungsanforderungen standhält.As a result of the method steps according to the invention, a structure is formed in the surface area of the rolling bearing component, which consists of a phase rich in cementite, which is comparable in terms of metal and crystallography to Ledeburit and largely non-magnetizable and can have a hardness of up to 700 HV. The core area of the component consists of the austenitic starting material. Provided that the rolling bearing component is treated according to the invention over a sufficiently long period of time, depending on the respective component and application, the hardened surface area of the rolling bearing component has a thickness which, despite the relatively soft austenitic core area of the rolling bearing component, ensures that it withstands the load requirements usually imposed on rolling bearing components .

Es wurde festgestellt, daß die nach dem erfindungsgemäßen Verfahren her­gestellten Wälzlagerbauteile überraschenderweise ihre Festigkeit und Härte bis Temperaturen von 600°C beibehalten, so daß sie nicht nur für Anwen­dungsfälle, in denen ein unmagnetisierbares Wälzlager erforderlich ist, ge­eignet sind, sondern auch für solche Anwendungsfälle, die eine hohe Temperaturbeständigkeit des Wälzlagers erfordern. Außerdem sind aus nach dem erfindungsgemäßen Verfahren hergestellten Wälzlagerbauteilen bestehende Wälzlager für solche Anwendungsfälle geeignet, in denen Wälz­lager mit aus Aluminiumlegierungen bestehenden benachbarten Bauteilen zusammenwirken, da die Wärmedehnungszahl austenitischer Werkstoffe der von Aluminiumlegierungen entspricht. Die bei herkömmlichen Wälzlagern aufgrund der unterschiedlichen Wärmeausdehnungszahlen auftretenden Passungsprobleme können somit durch die Verwendung von nach dem erfin­dungsgemäßen Verfahren hergestellten Wälzlagerbauteilen vermieden werden.It has been found that the rolling bearing components produced by the process according to the invention surprisingly retain their strength and hardness up to temperatures of 600 ° C., so that they are not only suitable for applications in which an unmagnetizable rolling bearing is required, but also for such applications, that require a high temperature resistance of the rolling bearing. In addition, roller bearings made from roller bearing components produced by the method according to the invention are suitable for those applications in which roller bearings interact with adjacent components made of aluminum alloys, since the thermal expansion coefficient of austenitic materials corresponds to that of aluminum alloys. The fitting problems that occur in conventional roller bearings due to the different thermal expansion coefficients can thus be avoided by using roller bearing components produced by the method according to the invention.

Besonders gute Ergebnisse werden erzielt, wenn nach einer Variante der Erfindung das Wälzlagerbauteil in einer sauerstofffreien Atmosphäre auf­gekohlt wird, die CH₄ oder C₃H₈ oder ein Gemisch aus beiden enthält.Particularly good results are achieved if, according to a variant of the invention, the rolling bearing component is carburized in an oxygen-free atmosphere which contains CH₄ or C₃H₈ or a mixture of both.

Wälzlagerbauteile mit einer Härte von mehr als 700 HV können hergestellt werden, wenn die sauerstofffreie Atmosphäre nach einer Ausführung der Erfindung atomaren Stickstoff enthält. Es diffundiert dann Stickstoff in die oberflächennahe Werkstoffschicht des Wälzlagerbauteils, der dort Nitride bildet, die eine weitere Härtesteigerung des oberflächennahen Gefüges bewirken.Rolling bearing components with a hardness of more than 700 HV can be produced if the oxygen-free atmosphere contains atomic nitrogen according to an embodiment of the invention. It then diffuses nitrogen into the near-surface material layer of the rolling bearing component, which forms nitrides there, which further increase the hardness of the near-surface structure.

Ein besonders gleichmäßiges Gefüge der oberflächennahen Werkstoffschicht des Wälzlagerbauteils wird erzielt, wenn nach einer Ausführungsform der Erfindung das Wälzlagerbauteil bei Temperaturen zwischen 800 und 1000°C, vorzugsweise jedoch zwischen 880 und 960°C aufgekohlt wird.A particularly uniform structure of the near-surface material layer of the roller bearing component is achieved if, according to one embodiment of the invention, the roller bearing component is carburized at temperatures between 800 and 1000 ° C., but preferably between 880 and 960 ° C.

Das nach dem erfindungsgemäßen Verfahren hergestellte Wälzlagerbauteil wird den gestellten Anforderungen in besonders hohem Maße gerecht, wenn der Kohlenstoffgehalt in der oberflächennahen Werkstoffschicht nach einer Ausführungsform der Erfindung wenigstens 1,5 % und das Wälzlagerbauteil nach einer weiteren Ausführungsform der Erfindung eine Oberflächenhärte von wenigstens 550 HV aufweist.The roller bearing component produced by the method according to the invention meets the requirements to a particularly high degree if the carbon content in the near-surface material layer according to one embodiment of the invention is at least 1.5% and the roller bearing component according to a further embodiment of the invention, has a surface hardness of at least 550 HV.

Nach einer Variante der Erfindung besteht das nach dem erfindungsge­mäßen Verfahren hergestellte Wälzlagerbauteil aus einem der auste­nitischen Werkstoffe × 5 CrNi 18 9, × 12 CrNiS 18 8, × 12 CrNi 17 7 oder × 10 CrNiTi 18 9, die, wie sich gezeigt hat, für das erfindungsge­mäße Verfahren besonders geeignet sind.According to a variant of the invention, the rolling bearing component produced by the method according to the invention consists of one of the austenitic materials × 5 CrNi 18 9, × 12 CrNiS 18 8, × 12 CrNi 17 7 or × 10 CrNiTi 18 9, which, as has been shown, for the method according to the invention are particularly suitable.

Mittels des erfindungsgemäßen Verfahrens ist es somit möglich, ein aus einem austenitischen Werkstoff bestehendes Wälzlagerbauteil herzustellen, das in seiner oberflächennahen Werkstoffschicht eine Härte aufweist, die für die typischen Wälzlagerbeanspruchungen ausreicht, und das dennoch un­magnetisierbar ist. Es kommt hinzu, daß das nach dem erfindungsgemäßen Verfahren hergestellte Wälzlagerbauteil eine hohe Warmfestigkeit besitzt und außerdem eine gegenüber herkömmlichen Wälzlagerbauteilen erhöhte Korrosionsbeständigkeit aufweist. Schließlich kann das nach dem erfin­dungsgemäßen Verfahren hergestelle Wälzlagerbauteil ohne Passungs­probleme mit aus Aluminiumlegierungen bestehenden Bauteilen zusammen­wirken, da beide eine in etwa gleiche Wärmeausdehnungszahl besitzen.By means of the method according to the invention, it is thus possible to produce a roller bearing component made of an austenitic material which has a hardness in its material layer close to the surface which is sufficient for the typical roller bearing stresses and which is nevertheless non-magnetizable. In addition, the roller bearing component produced by the method according to the invention has high heat resistance and also has increased corrosion resistance compared to conventional roller bearing components. Finally, the rolling bearing component produced by the method according to the invention can interact with components consisting of aluminum alloys without fitting problems, since both have approximately the same coefficient of thermal expansion.

Claims (7)

1. Verfahren zur Herstellung eines gehärteten, aus einem austenitischen Werkstoff bestehenden unmagnetisierbaren Wälzlagerbauteils, dadurch ge­kennzeichnet, daß die oberflächennahe Werkstoffschicht des Wälzlagerbau­teils bei hoher Temperatur in einer sauerstofffreien Atmosphäre aufge­kohlt und das Wälzlagerbauteil anschließend abgekühlt wird.1. A method for producing a hardened, made of an austenitic material non-magnetizable roller bearing component, characterized in that the near-surface material layer of the roller bearing component is carburized at high temperature in an oxygen-free atmosphere and the roller bearing component is then cooled. 2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß das Wälzlager­bauteil in einer sauerstofffreien Atmosphäre aufgekohlt wird, die CH₄, oder C₃H₈ oder ein Gemisch aus beiden enthält.2. The method according to claim 1, characterized in that the rolling bearing component is carburized in an oxygen-free atmosphere which contains CH₄, or C₃H₈ or a mixture of both. 3. Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die sauerstofffreie Atmosphäre atomaren Stickstoff enthält.3. The method according to claim 1 or 2, characterized in that the oxygen-free atmosphere contains atomic nitrogen. 4. Verfahren nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß das Wälzlagerbauteil bei Temperaturen zwischen 800 und 1000°C, vor­zugsweise zwischen 880 und 960°C aufgekohlt wird.4. The method according to any one of claims 1 to 3, characterized in that the rolling bearing component is carburized at temperatures between 800 and 1000 ° C, preferably between 880 and 960 ° C. 5. Wälzlagerbauteil, welches nach einem Verfahren nach einem der An­sprüche 1 bis 4 hergestellt ist, dadurch gekennzeichnet, daß der Kohlen­stoffgehalt in der oberflächennahen Werkstoffschicht des Wälzlagerbauteils wenigstens 1,5 % beträgt.5. rolling bearing component, which is produced by a method according to any one of claims 1 to 4, characterized in that the carbon content in the near-surface material layer of the rolling bearing component is at least 1.5%. 6. Wälzlagerbauteil, welches nach einem Verfahren nach einem der An­sprüche 1 bis 4 hergestellt ist, dadurch gekennzeichnet, daß es eine Ober­flächenhärte von wenigstens 550 HV aufweist.6. rolling bearing component, which is produced by a method according to any one of claims 1 to 4, characterized in that it has a surface hardness of at least 550 HV. 7. Wälzlagerbauteil, welches nach einem Verfahren nach einem der An­sprüche 1 bis 4 hergestellt, ist, dadurch gekennzeichnet, daß es aus einem der austenitischen Werkstoffe × 5 CrNi 18 9, × 12 CrNiS 18 8, × 12 CrNi 17 7 oder × 10 CrNiTi 18 9 besteht.7. Rolling bearing component, which is produced by a method according to any one of claims 1 to 4, characterized in that it consists of one of the austenitic materials × 5 CrNi 18 9, × 12 CrNiS 18 8, × 12 CrNi 17 7 or × 10 CrNiTi 18 9 exists.
EP86113601A 1985-10-23 1986-10-02 Method for producing a hardened non-magnetisable rolling bearing member from an austenitic material and rolling bearing member so produced Expired - Lifetime EP0226729B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3537658 1985-10-23
DE19853537658 DE3537658A1 (en) 1985-10-23 1985-10-23 METHOD FOR PRODUCING A HARDENED, UNMAGNETIZABLE ROLLER BEARING COMPONENT, MADE OF AN AUSTENITIC MATERIAL, AND ROLLER BEARING COMPONENT PRODUCED BY THIS METHOD

Publications (2)

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EP0226729A1 true EP0226729A1 (en) 1987-07-01
EP0226729B1 EP0226729B1 (en) 1991-08-28

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US (1) US4888065A (en)
EP (1) EP0226729B1 (en)
JP (1) JPS6299454A (en)
DE (2) DE3537658A1 (en)

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US6146471A (en) 1999-04-08 2000-11-14 Roller Bearing Company Of America Spherical plain bearing and method of manufacturing thereof
DE102004048172A1 (en) * 2004-10-02 2006-04-06 Ina-Schaeffler Kg Chipless produced thin-walled stainless bearing component in particular rolling bearing component
JP2006300137A (en) * 2005-04-18 2006-11-02 Ntn Corp Rolling bearing and rotating shaft supporting structure for fuel cell generator accessory
DE102006050122A1 (en) * 2006-10-25 2008-04-30 Schaeffler Kg Needle bearing has bearing ring, where bearing ring has hardened austenitic steel with total carbon and nitrogen content and needles roll on bearing surface of bearing ring
DE102008008113A1 (en) 2008-02-08 2009-08-13 Schaeffler Kg Non-magnetizable rolling bearing component of an austenitic material and method for producing such a rolling bearing component

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DE3681137D1 (en) 1991-10-02
US4888065A (en) 1989-12-19
JPS6299454A (en) 1987-05-08
DE3537658C2 (en) 1993-07-22
EP0226729B1 (en) 1991-08-28

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