Process for manufacturing thin pipes
OwnerBernhard Commandeur, Rolf Schattevoy +1inventors
InventorsBernhard Commandeur, Rolf Schattevoy, Klaus Hummert
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Abstract
The invention relates to a method for manufacturing thin-walled pipes, which are made of a heat-resistant and wear-resistant aluminum-based material. The method comprises the spray-compacting of a thick-walled pipe made of a hypereutectic aluminum-silicon AlSi material, possibly a subsequent overaging annealing, and the hot deformation to a thin-walled pipe. Such a method is in particular suited for the production of cylinder liners of internal combustion engines, since the produced liners exhibit the required properties in regard to wear resistance, heat resistance and reduction of pollutant emission.
Claims11
An aluminum-silicon alloy with a hypereutectic amount of silicon in the aluminum alloy for manufacturing liners for internal combustion engines produced by the following steps:
- spray compacting an aluminum alloy with a hypereutectic amount of silicon in the aluminum alloy melt onto a rotating support pipe such that there is generated directly a thick-walled pipe of a wall thickness of from 6 to 20 mm of the aluminum alloy material with the hypereutectic amount of silicon in the aluminum alloy material, wherein contained primary silicon particles have a size of from about 0.5 to 20 μm;
- reducing said thick-walled pipe by a hot-deformation process at temperatures of from 250 to 500° C. to a wall thickness of 1.5 to 5 mm.
A liner for internal combustion engines made of a hypereutectic aluminum silicon AlSi alloy by the production steps of:
- depositiong an aluminum silicon AlSi alloy melt by spray compacting onto a rotating support pipe such that there is generated directly a thick-walled pipe of a wall thickness of from 6 to 20 mm of a hypereutectic aluminum silicon AlSi material, wherein the contained primary silicon Si particles have a size of from 0.5 to 20 μm,
- subjecting said thick-walled pipe to an overaging annealing, wherein the primary silicon Si particles grow to a size of 2 to 30 μm;
- reducing said pipe is reduced by a hot deformation process at temperatures of from 250 to 500° C. to a wall thickness of 1.5 to 5 mm.
Dependencies are inferred from the claim text.