DE402706C - Process to increase the hardness of hardened rolling bearing parts - Google Patents
Process to increase the hardness of hardened rolling bearing partsInfo
- Publication number
- DE402706C DE402706C DEA35591D DEA0035591D DE402706C DE 402706 C DE402706 C DE 402706C DE A35591 D DEA35591 D DE A35591D DE A0035591 D DEA0035591 D DE A0035591D DE 402706 C DE402706 C DE 402706C
- Authority
- DE
- Germany
- Prior art keywords
- rolling bearing
- bearing parts
- hardness
- increase
- hardened
- 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
- 238000005096 rolling process Methods 0.000 title claims description 18
- 238000000034 method Methods 0.000 title claims description 6
- 229910000831 Steel Inorganic materials 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 238000005482 strain hardening Methods 0.000 description 3
- 238000003825 pressing Methods 0.000 description 2
- 229910000760 Hardened steel Inorganic materials 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000012805 post-processing Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
Classifications
-
- 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
- C21D7/00—Modifying the physical properties of iron or steel by deformation
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Crystallography & Structural Chemistry (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Rolling Contact Bearings (AREA)
Description
Verfahren zur Erhöhung des Härtegrades von gehärteten Wälzlagerteilen. Es ist bekannt, die Teile von Wälzlagern, Kugel- oder Rollenlagern zu härten, um den Wälzkörpern und Laufbahnen eine möglichst hohe Festigkeit zu verleihen. Ferner ist es bekannt, die Laufbahnen an Kugel- und Rollenlagern durch Drücken und Pressen vor dem Härten zu verdichten. Die Erfindung bezweckt, diese Härte noch weiter zu erhöhen, und zwar geschieht dies dadurch, daß die Teile der Wälzlager, welche in an sich bekannter Weise durch Erhitzung auf Härtetemperatur und nachfolgendes Kühlen gehärtet worden sind, einer mechanischen Kaltbearbeitung derart unterworfen werden, daß die Elastizitätsgrenze des gehärteten Stahls so weit überschritten wird, daß zum wenigsten in der Nähe der Oberfläche der Wälzlagerteile eine permanente Deformation eintritt. Dadurch gelingt es, Wälzlager herzustellen, die den höchsten Beanspruchungen gewachsen sind.Process for increasing the degree of hardness of hardened rolling bearing parts. It is known to harden the parts of rolling bearings, ball or roller bearings in order to to give the rolling elements and raceways the highest possible strength. Further it is known that the raceways on ball and roller bearings by pressing and pressing to compact before hardening. The invention aims to increase this hardness even further increase, this is done by the fact that the parts of the rolling bearings, which in in a manner known per se by heating to hardening temperature and subsequent cooling have been hardened, are subjected to mechanical cold working in such a way that that the elastic limit of the hardened steel is exceeded so far that a permanent deformation at least in the vicinity of the surface of the rolling bearing parts entry. This makes it possible to manufacture rolling bearings that are subject to the highest loads have grown.
Die Kaltbearbeitung von Metallen, insbesondere Stahl, nach vorangegangener Härtung durch Erhitzung und Abschreckung ist an sich bekannt, jedoch wurde dieses Verfahren bisher nur angewandt auf verhältnismäßig dünne Stahlgegenstände, beispielsweise Sensen oder Draht, weil man von der Annahme ausging, daß dicke Stahlgegenstände eine derartige Kaltnachbearbeitung ohne Nachteile nicht erdulden. Es wurde gefunden, daß diese Auffassung irrig ist und daß die Erhöhung des Härtegrades von bereits gehärteten Teilen von Wälzlagern durchaus möglich ist, wenn man diese Kaltbearbeitung darauf beschränkt, daß die durch Überschreitung der Elastizitätsgrenze erzeugte permanente Deformation wenigstens in der Nähe der Oberfläche der Wälzlagerteile erreicht wird.The cold working of metals, especially steel, according to previous Hardening by heating and quenching is known per se, but this has been done Method so far only applied to relatively thin steel objects, for example Scythes or wire, because it was assumed that they were thick steel objects not endure such cold finishing without disadvantages. It was found, that this view is erroneous and that the increase in the degree of hardness of already Hardened parts of rolling bearings is quite possible if you do this cold working limited to that generated by exceeding the elastic limit permanent deformation at least in the vicinity of the surface of the rolling bearing parts is achieved.
Das Verfahren läßt sich in der Weise durchführen, daß ein fertiggestelltes Wälzlager während einer gewissen Zeit mit einer die Normalbelastung so weit überschreitenden Überbelastung zur Umdrehung gebracht wird, daß das Material an oder in der Nähe der Lauffläche der Wälzkörper dauernd deformiert wird. Es ist aber auch möglich, die Laufringe zu überhärten, indem man sie mit besonderen, entsprechend dem Profil der Laufbahnen ausgebildeten Walzen unter erheblicher Überbelastung umlaufen läßt. Die also besonders gehärteten Bahnen oder Flächen der Wälzlagerteile können dann in bekannter Weise geschliffen und poliert werden, jedoch kann dieser Bearbeitungsgang auch vor der Kaltnachbearbeitung stattfinden.The method can be carried out in such a way that a completed Rolling bearings for a certain time with a normal load that far exceeds Overload is made to spin that material on or near the running surface of the rolling elements is permanently deformed. But it is also possible to over-harden the races by machining them with special ones, according to the profile of the raceways formed rollers can rotate under considerable overload. The particularly hardened tracks or surfaces of the rolling bearing parts can then be ground and polished in a known manner, but this processing step can also take place before cold post-processing.
Das Verfahren ist für W älzlagerteile deshalb von ganz besonderem Vorteil, weil durch die erwähnte Deformation die Elastizität dieser Teile erhöht wird, was gerade für Wälzlager von besonderer Bedeutung ist. 'Die durch die Deformation in den Wälzlagerteilen entstandene Spannung kann in bekannter Weise, bcispielsweise durch Erwärmen, wieder beseitigt werden.The process is therefore very special for rolling bearing parts Advantage because the aforementioned deformation increases the elasticity of these parts which is of particular importance for rolling bearings. 'The through the deformation Stress that has arisen in the rolling bearing parts can be used in a known manner, for example by heating, can be eliminated again.
Claims (1)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US402706XA | 1920-06-15 | 1920-06-15 |
Publications (1)
Publication Number | Publication Date |
---|---|
DE402706C true DE402706C (en) | 1924-09-18 |
Family
ID=21910074
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DEA35591D Expired DE402706C (en) | 1920-06-15 | 1921-06-04 | Process to increase the hardness of hardened rolling bearing parts |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE402706C (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE740297C (en) * | 1939-03-04 | 1943-10-16 | Stahlwerk Ergste Ag | Manufacture of stainless, spring-hard wires |
DE750462C (en) * | 1940-11-13 | 1945-01-17 | Richard Gerisch | Process to increase the wear resistance of sliding surfaces made of cast iron or steel |
FR2525638A1 (en) * | 1982-04-22 | 1983-10-28 | Dana Corp | PROCESS FOR FORMING A SURFACE CEMENTED ON A STEEL WORKPIECE |
-
1921
- 1921-06-04 DE DEA35591D patent/DE402706C/en not_active Expired
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE740297C (en) * | 1939-03-04 | 1943-10-16 | Stahlwerk Ergste Ag | Manufacture of stainless, spring-hard wires |
DE750462C (en) * | 1940-11-13 | 1945-01-17 | Richard Gerisch | Process to increase the wear resistance of sliding surfaces made of cast iron or steel |
FR2525638A1 (en) * | 1982-04-22 | 1983-10-28 | Dana Corp | PROCESS FOR FORMING A SURFACE CEMENTED ON A STEEL WORKPIECE |
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