Patents by Inventor Holger DIEROLF

Holger DIEROLF 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 and pressing tool for producing a complex formed sheet metal part with great drawing depth
    Patent number: 10646911
    Abstract: A method for producing a complex sheet metal part includes clamping a border region of the metal sheet between a die ring of an upper tool part of a pressing tool and a downholder of a lower tool part of the pressing tool; moving the upper tool part further downwards thereby pulling the metal sheet over extended punch inserts of a punch of the lower tool part, thereby generating local material reserves of the metal sheet; moving the upper tool part further downwards while actively retracting the punch inserts, thereby releasing the local material reserves; and forming the metal sheet between the die and the punch using only the local material reserves.
    Type: Grant
    Filed: May 12, 2017
    Date of Patent: May 12, 2020
    Assignee: Audi AG
    Inventors: Timo Alpen, Holger Dierolf, Jörg Spindler, Torsten Schilling, Bernhard Oberpriller
  • METHOD AND PRESSING TOOL FOR PRODUCING A COMPLEX FORMED SHEET METAL PART WITH GREAT DRAWING DEPTH
    Publication number: 20170326612
    Abstract: A method for producing a complex sheet metal part includes clamping a border region of the metal sheet between a die ring of an upper tool part of a pressing tool and a downholder of a lower tool part of the pressing tool; moving the upper tool part further downwards thereby pulling the metal sheet over extended punch inserts of a punch of the lower tool part, thereby generating local material reserves of the metal sheet; moving the upper tool part further downwards while actively retracting the punch inserts, thereby releasing the local material reserves; and forming the metal sheet between the die and the punch using only the local material reserves.
    Type: Application
    Filed: May 12, 2017
    Publication date: November 16, 2017
    Applicant: AUGI AG
    Inventors: Timo ALPEN, Holger DIEROLF, Jörg SPINDLER, Torsten SCHILLING, Bernhard OBERPRILLER