Patents by Inventor Gerhard Roettger

Gerhard Roettger has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Method of manufacturing turbine wheel disks with locally high internal compressive strains in the hub bore
    Patent number: 4879793
    Abstract: A method for manufacturing parts for rotary machines, especially turbine wheel disks, having a hub bore in a hub region, as well as turbine wheel disks manufactured by the method, includes pre-turning a contour at the hub region having a profile differing from a hub contour to be produced. At least the hub region is initially treated. At least the hub region having the pre-turned contour is cooled with a coolant fluid after the initial treatment to produce internal compressive strains in the hub region. The pre-turned contour is reduced after the cooling to the hub contour to be produced.
    Type: Grant
    Filed: March 16, 1988
    Date of Patent: November 14, 1989
    Assignee: Siemens Aktiengesellschaft
    Inventors: Erwin Stuecker, Gerhard Roettger