| CPC B22F 12/70 (2021.01) [B22F 12/49 (2021.01); B29C 64/153 (2017.08); B29C 64/371 (2017.08); B33Y 30/00 (2014.12)] | 6 Claims |
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1. An additive manufacturing apparatus, comprising:
a chamber which covers a manufacturing region;
an irradiation device which is arranged above the chamber and irradiates a material layer formed in the manufacturing region with a laser light or an electron beam to form a solidified layer;
a window which is arranged on an upper part of the chamber and below the irradiation device and transmits the laser light or the electron beam;
a supply port through which an inert gas is supplied to the chamber;
a supply nozzle which is attached to the supply port and through which two layers of airflow having different speeds are released toward the window; and
a discharge port which is arranged on a wall surface of the chamber facing the supply port and discharges the inert gas; wherein
the supply nozzle includes:
a first nozzle member having a first nozzle inlet end connected to the supply port and a first nozzle outlet end opposite to the first nozzle inlet end, a net-like member disposed at the first nozzle outlet end,
a second nozzle member having a second nozzle inlet end and a second nozzle outlet end, and a plurality of partition members arranged on the second nozzle member;
the net-like member has a plurality of through holes, and is attached in a state of being upright from a bottom surface of the first nozzle outlet end in a manner of covering a portion of a lower part of the first nozzle outlet end of the first nozzle member;
the second nozzle member is disposed at an upper side of the first nozzle outlet end of the first nozzle member, an upper end of the net-like member abuts a bottom surface of the second nozzle inlet end of the second nozzle member, and is arranged in a way of which a bottom surface of the second nozzle outlet end of the second nozzle member below the window is parallel to a glass surface of the window;
the bottom surface of the first nozzle outlet end of the first nozzle member and the bottom surface of the second nozzle inlet end of the second nozzle member are parallel to each other; and
in the inert gas introduced from the supply port, an upper airflow passes through the inside of the second nozzle member and is released in a flat shape over the entire region below the glass surface of the window as a first airflow by the plurality of partition members, and
a lower airflow passes through the plurality of through holes of the net-like member and is released into the chamber as a second airflow having a speed lower than that of the first airflow.
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