Three-dimensional deposition device

An additive manufacturing device which builds a three-dimensional object by injecting a powder material to a target region while irradiating the powder material with a laser beam and thereby forming an additive layer in the target region, comprising:

• a base unit on which the three-dimensional object is built;
• a deposition chamber accommodating the base unit;
• a hat-shaped cover provided inside the deposition chamber, the hat-shaped cover and the base unit defining the target region, the target region being configured to have a gas atmosphere different from a gas atmosphere outside hat-shaped cover;
• a deposition head attached to the hat-shaped cover and configured to inject the powder material in the target region;
• a first gas introducer which controls a first residual oxygen concentration by introducing and supplying an inert gas into the target region when forming the three-dimensional object, and
• a device controller which controls an operation of the additive manufacturing device and a supplying condition of the inert gas supplied by the first gas introducer, wherein
• the device controller is capable of;
• storing an information in a memory, the information includes at least one of (i) an operation program of the additive manufacturing device, (ii) an information of the additive manufacturing device, and (iii) a design information of the three-dimensional object for determining a forming condition of the additive layer, and
• determining the supplying condition of the inert gas to the target region based on the information stored in the memory to achieve a certain first gas atmosphere having a predetermined residual oxygen concentration in accordance with a type of the powder material used in forming the three-dimensional object.