Additive manufacturing apparatus and additive manufacturing method

An additive manufacturing apparatus that manufactures an object by adding a wire melted by irradiation with a beam to a workpiece, the additive manufacturing apparatus comprising:

• a machining head;
• a beam nozzle integrated with the machining head to allow the beam emitted from the machining head to pass therethrough;
• a material feeder integrated with the machining head and including a wire nozzle to feed the wire to the workpiece;
• a first driver to move the machining head, the beam nozzle, and the material feeder relative to the workpiece to move a tip portion of the wire relative to the workpiece, the tip portion of the wire being on a side of the workpiece;
• a second driver to move the beam relative to the beam nozzle in a direction included in a reference plane, the reference plane being a plane perpendicular to a central axis of the beam nozzle;
• and
• a controller programmed to:
• determine, based on a direction of travel of the tip portion of the wire, the direction in which the beam is moved relative to the beam nozzle by the second driver, the direction of travel of the tip portion of the wire being included in the reference plane associated with the second driver and the direction of travel of the tip portion of the wire being a direction in which the tip portion of the wire travels relative to the workpiece, and control the first driver and the second driver such that the beam is movable in a manner different from the movement of the tip portion of the wire relative to the workpiece, including:
• when the direction of travel of the tip portion of the wire is a first direction, controlling the second driver to move the beam forward with respect to the tip portion of the wire in the direction of travel of the tip portion of the wire, and
• when the direction of travel of the tip portion of the wire is a second direction that is different from the first direction, controlling the second driver to move the beam to coincide with the tip portion of the wire;
• and
• adjust an amount of shift of a center of the beam from the tip portion of the wire in accordance with the direction of travel of the tip portion of the wire, including:
• increasing the amount of shift of the beam from the tip portion of the wire as the direction of travel of the tip portion of the wire becomes closer to perpendicular to a central axis of the wire.