Lined mold for centrifugal casting
The invention relates to a rotary mold for centrifugal casting of an alloy. The mold comprises liners ( 135 a ) housed in hollow exoskeletons ( 137 a ). The exoskeletons retain the liners against the centrifugal force, during the casting, while the mold is spinning.
1. A rotary mold mounted to spin about an axis, for centrifugal casting of an alloy, the mold comprising:
a plurality of liners, each defining a recess for receiving the alloy, and extending radially about said axis; and
at least one exoskeleton inside which the liners are disposed, and that retains said liners against a centrifugal force;
wherein, transversely to the radial direction in which each liner extends, a space exists peripherally between said liner and the exoskeleton that surrounds it.
2. A mold according to claim 1 , further comprising a central block having ducts via which the alloy is cast, and which communicate with the insides of the liners, and a releasable fastening is established between the central block and at least one element chosen from each liner and the exoskeleton that surrounds said liner.
3. A mold according to claim 1 , wherein at least one element chosen from among said at least one exoskeleton and the liners is individually provided with a moving door that, in the open position, opens up an opening making it possible to pass the liner in question through it, and a cast piece coming from the solidified cast alloy, respectively.
4. A mold according to claim 1 , wherein the space is empty and centering zones position the liner in question in fixed manner relative to said at least one exoskeleton, for the casting.
5. A mold according to claim 1 , wherein said at least one exoskeleton is open-work.
6. A mold according to claim 1 , wherein the space is defined within a cellular structure extending peripherally between each liner and the exoskeleton that surrounds it.
7. A mold according to claim 6 , wherein the liner in question and the cellular structure, which has walls separating the cavities, bear against each other.
8. A mold according to claim 6 , wherein the liner in question and the cellular structure, which has walls separating the cavities, meet via discrete zones.
9. A mold according to claim 6 , wherein the liner, said cellular structure and the exoskeleton that surrounds the cellular structure are three elements that are mutually dissociable, the liner and the cellular structure being engaged in the exoskeleton concentrically.
10. A mold according to claim 1 , wherein the mold encloses a cast TiAl metal alloy and the liners are made of steel, of a metal alloy, and/or of a ceramic adapted so that such an alloy, in the molten state, can be cast into them.