Abstract:
The invention relates to a steel piston for internal combustion engines, comprising at least one piston upper part (12) provided with a combustion cavity (11) and an annular wall (5), and a piston lower part (13) provided with a connecting rod bearing (8). The steel piston is cast as a single component from a reduced-density steel alloy or a special steel alloy in the same material by means of a low-pressure casting method.
Abstract:
A turbo-machine (1), including a stator (2), internally coated with a running-in layer (6), a rotor (4) within the stator (2), wherein the turbo-machine (1) supplementally includes a device for parallel displacement and rotation of the rotation axis of the rotor (10) about the axis of symmetry of the stator (2). By means of this device the gap width between stator (2) and rotor (4) is minimized and therewith the economy of the turbo-machine (1) is increased.
Abstract:
Motors with high power densities and ignition pressures, for example diesel motors, require crankshafts with combined gear wheels, which can withstand high stresses, especially in their connection areas. As a consequence, forged steel crankshafts, to which tempered gear wheels are fixed by means of screws or welding, are usually employed. The aim of the invention is to provide a method comprising fewer method steps for producing a crankshaft with a combined gear wheel and to provide a crankshaft that has been produced according to said method. To achieve this, the crankshaft comprising the combined gear wheel is cast in one piece. Tempered ductile iron is used as the starting material. The strength and wear resistance is increased locally by peening, or by the application of coatings containing carbide.
Abstract:
A density reducing high carbon containing or UHC-steel and particular a superplastic steel, which besides iron and impurities conventionally accompanying steel, contains the following alloy components in wt. %: 0.8 to 2.5% C 3.5 to 15% Al 0.5 to 4% Cr 0.01 to 4% Si up to 4% Ni, Mn, Mo, Nb, Ta, V, and/or W, wherein the steel includes as additional alloy components 0.1 to 0.85 Sn, and 0 to 3% Ti, Be and/or Ga.
Abstract:
Deforming tool and process for manufacturing thereof in the deformation of work pieces the outer force acts on the deforming tool and/or the work piece, which causes a flow of the work piece material and its plastic deformation into a shape determined by the tool shape. Therein the tool is subjected to high friction wear forces. In the framework of the ever shorter production cycles it is also necessary that deforming tools must be produced ever more rapidly, wherein their friction wear resistance must be maintained to the greatest extent possible. The inventive deforming tool includes a lower and an upper tool, wherein lower and/or upper tool include a shape determining shell and a backfill for supporting thereof, wherein lower and/or upper tool are comprised at least in part of laminated material layers or powder particles joined to each other, wherein the deforming tool includes an elastic intermediate layer between lower and/or upper tool (backfill) and the shape determining shell. The elastic intermediate layer serves for evenly distributing or minimizing tension or pressure peaks in the pressure load in the deforming process, and thus to reduce the friction wear of the tool.
Abstract:
Hard mechanical coatings applied by thermal spray application onto softer surfaces frequently exhibit insufficient adhesion, so that undesired defoliations occur. It is the task of the present invention to provide a coating with optimal mechanical load bearing capacity and adhesion, as well as a simplified process for production thereof. The task is solved in that a gradient layer is applied by arc wire spraying upon a surface, wherein during the spray application at least one of the process parameters (a) current strength or voltage of the arc or (b) gas pressure of the carrier gas is varied.
Abstract:
A motor vehicle having a stainless supporting frame structure or a stainless body-in-white, including a supporting frame structure and flat body components mounted thereon, the supporting frame structure being formed of rust-resistant steels as well as light metal alloys and/or plastics and the flat body components being formed of rust-resistant steels, light metal alloys and/or plastics, the surface of the supporting frame structure or the body-in-white being free of anti-corrosion coating or anti-corrosion painting. In addition, a method for manufacturing a motor vehicle having a corrosion-resistant body-in-white includes the steps of: manufacturing a supporting frame structure by joining and/or welding together rust-resistant steels; and mounting flat body components and/or body panels made of light metals, plastics, or rust-resistant steels, thereby forming the body-in-white. A color-providing surface coating of the body-in-white is directly applied to the uncoated surface of the rust-resistant steels, light metals, or plastics.
Abstract:
A material wire for producing wear-resistant and tribologically favorable surface coatings from a supereutectic Al/Si alloy by thermal spraying. The material wire is a filling wire that has a sheath made of metallic aluminum and a filling made of one or more additional alloy components.
Abstract:
A component is made, in regions, of a ceramic-metal composite material. A porous sacrificial body produced from ceramic precursors is filled with softened metal and/or a metallic alloy at a predeterminable filling temperature at or above the softening temperature of the filling metal and under superatmospheric pressure. The filled sacrificial body is heated to or above a reaction temperature which is higher than the filling temperature, where a reaction between the filling metal (FMe) and the metal of the ceramic of the sacrificial body (CMe) is carried out, forming the ceramic-metal composite material comprising a ceramic phase and a metallic phase. The ceramic phase comprises CMemBx and/or CMenCy and/or CMeoCN and FMepO3, and the metallic phase comprises an intermetallic compound of a metal of the ceramic (CMe) and a filling metal (FMe). The sacrificial body is filled with the filling metal (FMe) during pressure casting of the component. A shape at least close to the final shape of the component, comprising a filled sacrificial body and the intermediate element(s) free of the sacrificial body, is cast by the pressure casting tool, and the component after casting is complete is heated to or above the reaction temperature in the region of the sacrificial body.
Abstract:
A method for manufacturing a brake rotor which includes a disc-shaped carrier and friction rings arranged on or on top of the carrier, so that the friction rings and carrier form a single piece construction. The carrier and friction ring(s) are separately molded into pre-forms, subsequently joined and finished formed in a press tool. The carrier and friction rings are made from carbon/carbon materials and ceramic materials respectively. The carrier has a hat-shaped cross-sectional shape with a flanged outer edge and the friction rings are attached to each side of the flanged edge of the carrier. The brake rotor may be directly mounted onto the wheel flange via the carrier using bolts.