Method and device for machining a part by abrasion

Abstract

The abrasion machining method according to the invention, for abrading a part that cannot be machined by conventional means, comprises the following steps:

• • a pin is placed at a certain distance from the part to be machined, so that there is no contact between the part and the pin;
  • the pin is driven so as to rotate;
  • an abrasive liquid is injected between the rotating pin and the part in order to abrade the latter; and
  • the pin is moved translationally along the part.

Thanks to the method, the part may be machined precisely and reproducibly.

Description

BACKGROUND OF THE INVENTION[0001]The present invention relates to the machining of parts and more particularly to the machining of parts made of ceramic matrix composites.[0002]Ceramic matrix composites are generally denoted by the acronym CMC. These composites are formed from a ceramic matrix, for example based on carbon (C) or silicon carbide (SiC) within which fibers of a material having good tensile strength properties extend so as to take up the forces to which the composite is subjected. The ceramic matrix provides the bonding between the fibers, ensures that they are spaced apart and transfers the forces to which the CMC part is subjected to said fibers.DESCRIPTION OF THE PRIOR ART[0003]CMC materials are used especially for the manufacture of parts for applications in the aeronautical field, in particular for the manufacture of turbine blades, turbine seals, combustion chambers, nozzles, guide vanes, etc. CMC parts are abradable (i.e. they can be abraded). The known methods f...

AI Technical Summary

Benefits of technology

[0015]Preferably, since the pin is formed from a material having a certain hardness and the part is formed from a material having a certain hardness, the abrasive material of the abrasive liquid has a hardness between the hardness of the pin and the hardness of the part. Thus, it is guaranteed that the liquid has an abrasive effect on the part but not on the pin, and that the pin i

Problems solved by technology

Problems arise when machining parts formed from a CMC material, irrespective of the method chosen.

The methods most often used, which are grinding and water jet cutting, are either expensive or do not provide high-precision machining.

This is particularly problematic when the parts are of complex shape, especially in the aeronautical field that imposes standa

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