Additive manufacturing apparatus, additive manufacturing method, and machine learning device

An additive manufacturing apparatus that manufactures a shaped object by stacking layers in each of which unit beads that are solidified products of a molten material are laid side by side, the additive manufacturing apparatus comprising:

• a material supply to supply the material to a workpiece;
• a beam irradiator to emit a beam that melts the material supplied;
• and
• a controller device to control the material supply and the beam irradiator to form a unit bead, wherein
• in forming unit beads that are brought into contact with each other to form the layer, the controller device performs control such that the formed unit bead is flattened by irradiation with the beam, and a new unit bead is formed in contact with the formed unit bead that has been flattened,
• wherein the new unit bead is formed at a position in contact with a flattened portion of the formed unit bead that has been flattened,
• wherein the controller device performs control such that the formed unit bead is flattened when a contact angle of the formed unit bead is larger than 45 degrees or a flatness of the formed unit bead is less than five, and
• wherein the contact angle of the formed unit bead is an angle formed by a surface of the workpiece and a surface of the formed unit bead and containing the formed unit bead, and the flatness of the formed unit bead is a ratio between a width of the formed unit bead in a direction in which multiple said unit beads are laid side by side and a height of the formed unit bead from the surface of the workpiece.