Manufacturing for a cast engine part having a bearing arrangement shaped in several parts via fracture separating
AssigneesBayerische Motoren Werke Aktiengesellschaft, Fritz Winter Eisengiesserei GmbH & Co. KG
InventorsClemens Luchner, Horst Henkel
Life of this patent
Estimating the term…
Abstract
A core is formed and a prefabricated bearing bore is provided. Two separate projections are provided on the core wherein free projection edges of the two separate projections have a respective shaping radius between R=0.sub.mm and R.ltoreq.0.45.sub.mm. Subsequently indentations are produced in a circumferential area of the bearing bore by the two separate projections on the core wherein the indentations serve as fracture notches. The cast engine part is then formed by casting metal around the core using said fraction notches as incipient crack sites.
Claims21
A manufacturing process for manufacturing a cast engine part having a bearing arrangement constructed in several parts through fracture separation, comprising the steps of:
- forming a core and providing a prefabricated bearing bore;
- providing at least two separate projections on said core wherein free projection edges of said at least two separate projections have a respective shaping radius between R=0.sub.mm and R.ltoreq.0.45.sub.mm ;
- producing indentations in a circumferential area of said bearing bore by means of said at least two separate projections on the core wherein said indentations serve as fracture notches;
- forming the cast engine part by casting metal around the core using said fraction notches as incipient crack sites.
A process for manufacturing a cast engine part having fracture notches, comprising the steps of:
- forming a core with at least one separate projection located on the core;
- providing said at least one separate projection with a corresponding at least one free projection edge having a respective shaping radius between R=0.sub.mm and R.ltoreq.0.45.sub.mm ;
- and
- forming the cast engine part by casting metal around the core wherein said at least one separate projection forms fracture notches operating as incipient crack sites.
Dependencies are inferred from the claim text.