Electrical Discharge Knockout Means Patents (Class 164/510)
  • Patent number: 4802525
    Abstract: A mold or parts of the mold are removed from a casting following solidification and cooling by immersing the casting with mold or mold particles still attached in a liquid such as oil or water and focusing shock waves onto interface portions to obtain ablation and spalling of the mold material to be removed from the casting.
    Type: Grant
    Filed: December 5, 1986
    Date of Patent: February 7, 1989
    Assignee: Dornier Medizintechnik GmbH
    Inventors: Gerold Heine, Joachim Stark
  • Patent number: 4606398
    Abstract: A method for electrohydroblasting of castings in a liquid medium with a view to removing core and molding sand, according to which castings are subjected to a series of electrohydraulic shocks and at the same time set in reciprocating motion. The reciprocating frequency of the castings and the length of their stroke are sufficient to produce a flow of liquid in the internal channels of the castings and thus remove core and molding sand therefrom. The method is carried out with the aid of an apparatus which comprises a casting-reciprocating mechanism interacting with an electrode-positioning mechanism so that the movement of the castings is synchronized with that of the electrode.
    Type: Grant
    Filed: August 2, 1984
    Date of Patent: August 19, 1986
    Inventors: Valery V. Prikhodko, Boris V. Kostyrkin, Pavel I. Tsarenko