Sintered Gear Element Featuring Locally Selective Surface Compression
AssigneeGKN Sinter Metals Holding GmbH
InventorGerhard Kotthoff
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Abstract
A method for producing an at least partially surface-densified metallic toothed element comprising a densified sintering material, in order to improve a strength profile, a preform of the toothed element being produced with a locally selective oversize profile relative to a final size of the toothed element and being rolled to the final size by means of at least one rolling die, the toothed element being densified in locally varied manner at least in the region of at least one flank and/or one root of a tooth of the toothed element to produce a densified outer layer.
Claims39
A method for producing an at least partially surface-densified metallic toothed element comprising:
- providing preform of the toothed element being produced, said preform comprising densified sintering material and having a locally selective oversize profile relative to the final size of the toothed element;
- and
- rolling the preform to the final size of the toothed element using at least one rolling die;
- wherein the toothed element is densified in a locally varied manner in at least one region of at least one flank and/or one root of a tooth of the toothed element to produce at least one densified outer layer region at the surface of the toothed element.
A preform for the production of an at least partially surface-densified metallic toothed element comprising a first and a second flank of a tooth, each flank having a different oversize profile.
A toothed element having a metallic sintering material, wherein the toothed element has locally varied densification at least in a region of at least one flank of a tooth of the toothed element.
A device for the production of an at least partially surface-hardened tooth element comprising a die control adapted to a varying oversize profile.
A device for the production of an at least partially surface-hardened tooth element from a preform consisting at least in a surface region of a sintering material, the device comprising a die that provides compensation of different oversize profiles at a first and a second flank of a tooth of the preform to be densified by means of rolling motion.
A method for designing an oversize profile for achieving surface densification of a sintered metal toothed element in a rolling process, comprising iteratively determining the oversize profile.
A method for designing an oversize profile for achieving surface densification of a metallic toothed element in a rolling process comprising
- automatically generating, using at least one design set value, an oversize profile of a preform of the toothed element, wherein the oversize profile is locally varied at least in one area of a flank of a tooth and definable at least point by point;
- automatically generating the geometry of a rolling die;
- simulating a rolling process and resulting local densification profile for at least one outer layer of the toothed element;
- generating an automatic evaluation of the densification profile;
- comparing the densification profile with a set value;
- and optionally
- repeating the method using at least one variation until a stopping criterion is fulfilled.
Dependencies are inferred from the claim text.