Supply system for supplying a mould with molten metal, and facility and manufacturing method implementing same
A feed system for conveying a molten metal that is to make a casting, the system including a feed channel made of ceramic material that is configured to enable the molten metal to flow by gravity inside the feed channel, the feed channel having a first portion extending in a first direction, and at least one second portion extending in a second direction different from the first direction, the second portion being arranged downstream from the first portion and being connected to the first portion by a junction. The system further includes a damping channel having a first end opening out into the junction and a second end that is closed, the damping channel extending the first portion of the feed channel.
1. An installation made of ceramic material for fabricating a plurality of castings from a molten metal, the installation comprising:
a vertical duct surmounted by a bush through which a liquid metal is to be introduced into the installation, the vertical duct including a distributor in proximity of its bottom end;
at least one feed system for conveying the molten metal for making the castings, each feed system comprising a feed channel configured to enable the molten metal to flow under gravity inside said feed channel, said feed channel having a first portion extending in a first direction from the distributor, and two second portions extending in a second direction different from the first direction, each second portion being arranged downstream from the first portion and being connected to the first portion by a junction; and
at least two molds, each mold being connected to a second portion of the feed channel so as to convey a molten metal from the feed system into each mold;
wherein the feed system further comprises a damping channel having a first end opening out into the junction and a second end that is closed, said damping channel extending the first portion of the feed channel.
2. An installation according to claim 1 , wherein the feed channel of the feed system presents a section that is circular, the length of the damping channel being greater than or equal to twice the diameter of the feed channel.
3. An installation according to claim 1 , wherein the damping channel has a first portion extending between the first end and a second portion, said second portion extending between said first portion and said second end of the damping channel, said second portion being situated lower than said first portion.
4. An installation according to claim 3 , wherein the second portion of the damping channel of the feed system extends in an inclined direction.
5. An installation according to claim 3 , wherein the second portion of the damping channel of the feed system extends in a vertical direction.
6. An installation according to claim 1 , wherein the damping channel of the feed system presents a section that is semicircular.
7. An installation according to claim 1 , wherein the first and second directions are mutually orthogonal.
8. An installation according to claim 1 , further comprising at least two grain selector ducts, each grain selector duct being connected both to a second portion of a feed channel and also to a mold.
9. An installation according to claim 1 , wherein the molds are adapted to mold turbine blades of an aviation turbine engine.
10. A method of fabricating a plurality of castings from a molten metal, the method comprising:
filling molds with a molten metal by introducing the molten metal into the bush of an installation according to claim 1 ; and
implementing directed solidification of the molten metal present in each mold so as to obtain the casting.