Patent ID: 11969793
Assignee: MITSUBISHI ELECTRIC CORPORATION
Field: Other special machines (Mechanical engineering)
Classification: CPC B  Y | IPC B

Claim 0:
1. An additive manufacturing device comprising:
a chamber which has a first side wall including an upper opening formed in an upper portion and a lower opening formed in a lower portion located below the upper portion, a second side wall disposed so as to face the first side wall and including a discharge port formed so as to face the lower opening, and a top plate provided from an upper end of the first side wall to an upper end of the second side wall and including a window portion capable of transmitting laser light, and defines a space therein;
a stage which is provided in the chamber and of which an upper surface side is a manufacturing area;
a recoater which is provided in the chamber and supplies a metal powder to an upper surface of the stage;
a laser irradiation unit which irradiates the metal powder deposited on the upper surface of the stage with the laser light through the window portion to manufacture a manufactured product;
a lower nozzle which ejects an inert gas in a horizontal direction into the chamber through the lower opening; and
an upper nozzle which ejects the inert gas into the chamber through the upper opening,
wherein the upper nozzle has
a window portion nozzle that ejects the inert gas along the window portion, and
an oblique nozzle that ejects the inert gas in an obliquely downward direction from the upper portion of the first side wall,

wherein any inert gas ejected from the lower nozzle that is not discharged from the discharge port flows, as residual inert gas, in a first direction toward the top plate along the second side wall,
the window portion nozzle is configured to eject the inert gas such that the flow of residual inert gas flowing in the first direction is changed to flow in a second direction by the inert gas ejected from the window portion nozzle, and
the ejection direction of the oblique nozzle is set such that the flow of the residual inert gas flowing in the second direction is changed to flow in a third direction by at least a portion of the inert gas ejected from the oblique nozzle, the third direction extending away from an optical path of the laser light and toward the second side wall.