Abstract:
Method for surface hardening at least one part of a surface of a metal component (10, 12, 4, 16), which comprises the steps of a) enriching said at least one part of a surface of a metal component (10, 12, 14, 16) with carbon and/or nitrogen, and b) induction hardening said at least one part of said surface of the metal component (10, 12, 14, 16).
Abstract:
This heat treatment of bearing steel comprises annealing and hardening. Hardening is carried out after annealing and after the manufacture of structural parts from this steel. The first part of the annealing process is heating of the steel at a rate of more than 1 °C/s to a temperature in the range between 750 °C and 900 °C. It is followed by holding at the temperature achieved for at least 400 seconds. This is followed by cooling at a rate higher than 0.02 °C/s to a temperature, at which austenite begins to transform to ferrite and carbides. In the next step, there is cooling to such temperature and at such rate that complete transformation of austenite to ferrite and carbides takes place at least in the desired location of the steel. The cycle of heating, holding and cooling is carried out at least once. Then the steel is cooled to the ambient temperature. In the preferred embodiment, the quenching temperature during subsequent hardening is lower than the quenching temperature of the conventionally annealed steel in question. The steel may be heated by induction.
Abstract:
This heat treatment of bearing steel comprises annealing and hardening. Hardening is carried out after annealing and after the manufacture of structural parts from this steel. The first part of the annealing process is heating of the steel at a rate of more than 1 °C/s to a temperature in the range between 750 °C and 900 °C. It is followed by holding at the temperature achieved for at least 400 seconds. This is followed by cooling at a rate higher than 0.02 °C/s to a temperature, at which austenite begins to transform to ferrite and carbides. In the next step, there is cooling to such temperature and at such rate that complete transformation of austenite to ferrite and carbides takes place at least in the desired location of the steel. The cycle of heating, holding and cooling is carried out at least once. Then the steel is cooled to the ambient temperature. In the preferred embodiment, the quenching temperature during subsequent hardening is lower than the quenching temperature of the conventionally annealed steel in question. The steel may be heated by induction.
Abstract:
A spherical plain bearing for a heavy haul truck strut includes an outer ring (12) and an inner (14) ring. The outer ring includes an outer ring core disposed between a concave spherical first bearing surface and an exterior mounting surface. The inner ring includes an inner ring core disposed between a convex spherical second bearing surface and an interior surface. The inner ring is disposed within the outer ring with the first bearing surface' (32) engaging the second bearing surface (38). At least a portion of at least one of the first bearing surface, the second bearing surface, the exterior mounting surface and the interior surface has a hardness greater than that of at least one of the outer ring core and the inner ring core, for providing wear and impact resistance.
Abstract:
The present invention relates to a process for treating a contact surface of a steel component of a rolling contact loaded machine element, the process comprising: providing a steel component having a surface layer predominantly having a martensitic and/or bainitic microstructure and a contact surface adjacent the surface layer; cold-working said contact surface to introduce a compressive residual stress of at least 400 MPa to a depth of at least 50 microns from said contact surface; machining said contact surface; and heating the cold-worked and machined steel component below the tempering or transformation temperature of the steel.
Abstract:
A crankshaft (100) having a crankpin journal (136), a main journal (108), and a crank web (120), is provided. The crankpin journal (136) and the main journal (108) have a hardened surface (402) up to a first pre-determined depth. The crankshaft (100) includes a crankpin journal fillet (202) joining the crankpin journal (136) and the crank web (120). The crankshaft (100) also includes a main journal fillet (204) joining the main journal (108) and the crank web (120). The crankpin journal fillet (202) and the main journal fillet (204) both include a hardened surface (402) strengthened by a peening process. The crankshaft (100) further includes an oil passage (152) extending through the crankpin journal (136) and the main journal (108). The oil passage (152) extends such that a portion of a surface (402) proximate to the oil passage (152) is hardened to a second pre-determined depth.
Abstract:
Die Erfindung betrifft eine Lageranordnung (1), umfassend zwei Wälzlager (2, 3) mit jeweils einem Innenring (4, 5) und einem Außenring (6, 7) sowie zwischen den Lagerringen angeordneten Wälzkörpem (8, 9), wobei die beiden Wälzlager durch relative Verschiebung der Innenringe und/oder der Außenringe in axiale Richtung (a) vorgespannt werden können, wobei an den Innenringen und/oder an den Außenringen Borde (10, 11) angeordnet sind, die einen axialen Anschlag für die Wälzkörper bilden. Um die Vorspannung in der Lageranordnung einfacher und genauer einstellen zu können, sieht die Erfindung vor, dass mindestens einer der Borde relativ zu dem diesen tragenden Lagerring in axiale Richtung verstellbar auf dem Lagerring angeordnet ist.
Abstract:
Gemäß einem ersten Aspekt der Erfindung umfasst ein Verfahren zur Herstellung eines bruchgetrennten Bauteils, insbesondere eines Pleuels, mit einer wenigstens teilweise beschichteten Bohrung folgende Schritte: - Bereitstellen eines Rohbauteils; - Aufbringen einer Beschichtung aus einem Lagerwerkstoff an einer Bohrungsoberfläche; und - Umformen der Beschichtung zur Kompensation von inneren Zugspannungen in der Beschichtung vor einem Bruchtrennen des Bauteils. Gemäß einem zweiten Aspekt der Erfindung umfasst ein Verfahren zur Herstellung eines bruchgetrennten Bauteils, insbesondere eines Pleuels, mit einer wenigstens teilweise beschichteten Bohrung folgende Schritte: - Bereitstellen eines Rohbauteils; - Aufbringen einer Beschichtung aus einem Lagerwerkstoff an einer Bohrungsoberfläche vor einem Bruchtrennen des Bauteils; und - Bilden einer Gegen-Härtezone vor dem Aufbringen der Beschichtung zur Erzeugung von Druckspannungen, die inneren Zugspannungen der Beschichtung entgegengesetzt sind.