Patents by Inventor Christian Defrocourt

Christian Defrocourt 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).

  • Patent number: 8490673
    Abstract: A method for deburring a ceramic foundry core obtained by injecting a ceramic paste, the paste including a binder having a predetermined glass transition temperature, into a mold and having at least one surface portion with a surplus of material forming a burr to be eliminated. The method includes the following stages: a) disposing and attaching the molded, unfired foundry core onto a mounting; b) placing a milling tool, having an elongated shape with a helically cut edge, onto a tool holder; c) causing the tool to rotate around its axis and touching the milling tool to the surface portion to be deburred; and d) freezing the surface portion to be deburred such that the foundry core is maintained at a temperature lower than a glass transition temperature during the deburring operation.
    Type: Grant
    Filed: April 17, 2009
    Date of Patent: July 23, 2013
    Assignee: SNECMA
    Inventors: Christian Defrocourt, Serge Prigent, Daniel Quach, Patrick Wehrer
  • Publication number: 20130167337
    Abstract: A method for adjusting a predetermined contour of a turbine blade root including a main salient edge defined by a determined interior angle. The method includes: chamfering the main edge of the contour to obtain two auxiliary salient edges, associated interior angles of which are respectively greater than the interior angle of the main edge; and blunting the auxiliary edges obtained to fine-tune the contour of the blade root.
    Type: Application
    Filed: September 15, 2011
    Publication date: July 4, 2013
    Applicant: SNECMA
    Inventors: Olivier Dupouy, Christian Defrocourt, Thomas Marquoin, Pascal Paul
  • Publication number: 20110049748
    Abstract: The present invention relates to a method for deburring a ceramic foundry core (10) obtained by injecting a ceramic paste, said paste including a binder having a predetermined glass transition temperature, into a mold and having at least one surface portion with a surplus of material forming a burr (B) to be eliminated. The method is characterized in that it includes the following stages: a) disposing and attaching the molded, unfired foundry core (10) onto a mounting (300); b) placing a milling tool (100), having an elongated shape with a helically cut edge, onto a tool holder; c) causing the tool to rotate around its axis and touching the milling tool to said surface portion to be deburred; and d) freezing (400) the surface portion to be deburred such that the foundry core is maintained at a temperature lower than said glass transition temperature during the deburring operation.
    Type: Application
    Filed: April 17, 2009
    Publication date: March 3, 2011
    Applicant: SNECMA
    Inventors: Christian Defrocourt, Serge Prigent, Daniel Quach, Patrick Wehrer
  • Patent number: 7458411
    Abstract: A method of manufacturing a cast core with at least one recess, corresponding to a partition of a turbomachine blade, includes the steps of shaping, in a mold, a mixture containing a ceramic particles filler and an organic binder; forming a core rough casting without the recess in the mold; extracting the core rough casting from the mold; machining the recess in the core rough casting thereby forming a machined core with the recess; removing the organic binder from the machined core; and heat treating the machined core to consolidate the machined core. The step of machining the recess is performed before the step of heat treating the machined core.
    Type: Grant
    Filed: November 25, 2005
    Date of Patent: December 2, 2008
    Assignee: SNECMA
    Inventors: Serge Prigent, Christian Defrocourt
  • Publication number: 20060219379
    Abstract: The invention relates to a method of manufacturing a cast ceramic core comprising at least one recess, particularly for partitions, for a turbomachine blade in particular, comprising the shaping in a mould of a mixture containing a ceramic particles filler and an organic binder, extraction of the core from the mould, removal of the binder and a heat treatment to consolidate the core. The method is characterized in that a core rough casting without the said recess is formed in the said mould and in that the said recess is machined once the rough casting has been extracted from the mould and before the heat treatment operation. In particular, the machining operation is performed mechanically by milling with the removal of chips. The invention also relates to a tool suited to implementing the method.
    Type: Application
    Filed: November 25, 2005
    Publication date: October 5, 2006
    Applicant: SNECMA
    Inventors: Serge Prigent, Christian Defrocourt