Mahle Gmbh

Mahle International Gmbh

Frank Winger

Karlheinz Bing

Patrick Sutter

Roland Ruch

Udo Rotmann

Martin Rühle

Fritz Warth

An insert part for a cast piston of an internal combustion engine may include a powder, such as a sintered powder material, containing at least iron or alloys thereof, and having a capacity for being infiltrated. The powder may contain particles having different grain sizes, and up to 4% by volume of the powder may include particles having a diameter smaller than 75 &#x3bc;m.

Insert part that can be infiltrated

A light metal cylinder liner with a surface which facilitates the connection with the surrounding cast material may be produced. The cylinder liner is produced by a lost-foam method with a form for production of the cast foam model having a structured surface with height variations of 0.8 to 5 mm. The structured surface is, for example, grooves or longitudinal elevations.

Method for the production of a lost-foam casting model for a light metal cylinder liner

The aim of the invention is to produce a light-alloy bearing bush with a rough external surface. To achieve this, particles, which are subsequently surrounded in part by the molten metal, are applied to the surface of the casting mould. When the bearing bush is released from the mould, the particles remain in said bush and are subsequently removed from the bearing bush preform either mechanically or by being dissolved in liquid.

Method for producing a light-alloy bearing bush with a rough external surface

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Stuttgart, Germany

Frank Winger