Snecma

Safran Aircraft Engines

Patrick Wehrer

Daniel Quach

Serge Prigent

Yvon Marie-Joseph Louesdon

Jean-Louis Martial Verger

Patrick Pourfilet

Didier Guerche

Christian Defrocourt

Joseph Tami-Lizuzu

Didier Legeai

A method for finishing a shape of a component by machining, in which one area is produced by smelting with a thickened portion forming a first surface with a surrounding profile and a theoretical profile defined by a second surface, the method including: defining, on the second surface, a grid forming nodes and squares; defining each point over which the machining tool is to pass according to weighting coefficients equal to weight to be given to the nodes of the square in which the tool is located, to be the barycenter of assigned nodes of the coefficients; measuring, for each node located outside an outer limit, the delta between the first surface at the node and the theoretical position of the node; calculating deltas for each node within the outer limit by interpolation from already known deltas; using the weighting coefficients, defining the delta to be applied at each point.

Adaptive machining method for smelted blades

A mold for producing a part, such as a turbomachine blade model, by injecting wax into a cavity, the cavity including at least two cavity elements, each of which is supported in a cavity block. The two cavity blocks are mobile relative to one another between a closed position for injecting the wax and an open position for removing the part following the injection of the wax. The two cavity blocks are mobile in a horizontal plane.

Mold for producing parts by wax injection

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.

Method for deburring a ceramic foundry core

A process for manufacturing a ceramic foundry core having at least one thin region with a thickness 'e', in particular in of a turbomachine blade trailing edge, including the forming in a mold of a mixture including a ceramic particle filler and an organic binder, the extraction of the core from the mold, the binder removal and consolidation heat treatment of the core. The process is one in which a core is formed in the mold, the region of this core being thickened relative to the thickness 'e' by an overthickness E and in which the overthickness is machined after the core has been extracted from the mold and before or after the heat treatment operation. In particular, the machining is carried out mechanically by milling, either with removal of chips on the cores before firing, or by abrasion on the fired cores.

Process for manufacturing ceramic cores for turbomachine blades

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Maisons Laffitte, France

Patrick Wehrer