Abstract:
Die Erfindung betrifft ein aus einem Werkstoffverbund gebildetes Bauteil, das zumindest abschnittsweise von einer Bruchfläche begrenzt ist. Weiterhin betrifft die Erfindung ein Verfahren zur Vorbereitung einer in ihrem Verlauf weitgehend vorbestimmten Bruchtrennstelle in einem Bauteil. Erfindungsgemäß wird zur Vorbereitung der Bruchtrennstelle in einem für eine Rißinitiierung relevanten Bereich lokal eine spröde Zone gebildet, indem mittels eines auf den relevanten Bereich gerichteten energiereichen Strahles der Werkstoff einer ersten Werkstoffzone aufgeheizt wird und mit dem Werkstoff einer darunterliegenden zweiten Zone lokal eine spröde Diffusionsverbindung eingeht.
Abstract:
A piston main body (13) in a piston assembly (10A) of a fluid pressure cylinder (11) has a first piston member (40) and a second piston member (42) composed of a plate-shaped member. The first piston member (40) and the second piston member (42) are joined in a state overlapping in the axial direction of a piston rod (15). The second piston member (42) is not provided with a hole that passes through in the plate thickness direction.
Abstract:
Exemplary pistons and methods of making the same are disclosed. An exemplary method generally includes providing a piston lower part defining a piston axis and at least a portion of the upper combustion bowl surface, and assembling a piston upper part to the piston lower part. The piston upper and lower parts cooperate to define at least in part an annular cooling gallery extending about the piston. The method may further include bringing the piston upper and lower parts together along respective upper and lower mating surfaces and inducing an electric current between the upper and lower mating surfaces while the upper and lower mating surfaces are in contact.
Abstract:
An exemplary piston includes a piston body (102) having radially inner and outer body mating surfaces. The piston further includes a cooling gallery ring (104) cooperating with the piston body (102) to form a continuous upper combustion bowl surface and a cooling gallery. The cooling gallery ring (104) has radially inner and outer ring mating surfaces abutted along their corresponding radially inner and outer body mating surfaces, such that the cooling gallery is substantially enclosed. The piston body (102) and cooling gallery ring (104) is joined together along the radially inner and radially outer interface regions to form a generally one- piece piston assembly. The radially outer interface region may be elongated in a direction parallel to the piston axis, is facilitating a laser welding joining process.
Abstract:
The invention relates to a thermal coating method for applying a functional layer onto a workpiece surface, in particular a thermal coating method for applying a running surface coating onto a cylinder running surface of an internal combustion engine crankcase, said method having the following steps: melting coating material by means of a melting device, and applying coating material droplets onto the workpiece surface by means of a gas jet that is aimed at the workpiece surface, said gas jet blowing coating material droplets from a melting location of the melting device onto the workpiece surface. The coating material droplets are cooled or shock-frozen during the transportation of said droplets from the melting location to the workpiece surface.
Abstract:
The invention relates to a method for producing a piston (10, 110, 210) for an internal combustion engine from a first piston component (11, 111, 211) and a second piston component (12, 112, 212), characterized by the following method steps: (a) providing a blank (211') of the first piston component (11, 111, 211) made of a heat-treatable steel or a precipitation-hardening steel and having at least one joining surface (29, 31), (b) providing a blank (212') of the second piston component (12, 112, 212) made of a heat-treatable steel or a precipitation-hardening steel and having at least one joining surface (32, 33), (c) heat-treating the blanks (211', 212'), (d) connecting the blank (211') of the first piston component (11, 111, 211) to the blank (212') of the second piston component (12, 112, 212) by means of the joining surfaces (29, 31, 32, 33) thereof using friction welding in order to form a piston blank (210'), at least one friction weld (25, 26, 125, 226) and a heat-affected zone (30, 30') in the region of the at least one friction weld (25, 26, 125, 226) being formed in the process, (e) tempering or stress-relief annealing the piston blank (210) while preserving the heat-affected zone(s) (30, 30'), and (f) post-processing and/or finishing the piston blank (210') to form a piston (10, 110, 210). The invention further relates to such a piston (10, 110, 210).