Destructible core for undercut casting
AssigneeSociete Nationale des Poudres et Explosifs
InventorsAndre Hiss, Jean-Michel Tauzia
Life of this patent
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Abstract
Destructible cores useful particularly for shaping the internal channels of cast propellant blocks. The cores include at least one elongated element which is shaped, for example by winding, the cohesion of which is ensured by way of a joining material and a portion of which is accessible from the exterior of the component to be cast. In order to obtain quickly cores having a high rigidity, the shaped element is a band which includes interlaced wires having free spaces, the joining material filling the free spaces.
Claims8
A destructible core used for casting of a propellant block, said propellant block having at least one internal cavity and having an outer surface and being open to the outside only by way of one or more restricted orifices, said core having an outer surface and comprising at least one elongated element which is shaped in order to be contained in said outer surface of the core, a portion of said elongated element being a band of knitted wires having free spaces, said knitted wires forming layers, intermediate elements separate said layers, wherein said free spaces of said knitted wires are filled with a joining material, said joining material providing cohesion between said layers of knitted wires, said core being removed after the propellant block is cast by traction applied to said portion of said elongated element which is accessible from the outside, said intermediate elements being cylindrical or spherical.
Dependencies are inferred from the claim text.