ADDITIVE MANUFACTURING APPARATUS AND ADDITIVE MANUFACTURING METHOD
FIG20 is a view for explaining building of a deposit by the additive manufacturing apparatus according to a sixth embodiment of the present invention  FIG21 is a view for explaining building of a deposit by the additive manufacturing apparatus according to a first modification of the sixth embodiment of the present invention
FIG20 is a view for explaining building of a deposit by the additive manufacturing apparatus 1 according to a sixth embodiment of the present invention. In the sixth embodiment, the additive manufacturing apparatus 1 stacks beads 33A in the oblique direction while stacking beads 33B in the vertical direction. The additive manufacturing apparatus 1 stacks the beads 33A in the oblique direction such that a deposit of the bead 33A reaches a deposit of the bead 33B located ahead in the set direction. As a result, the additive manufacturing apparatus 1 can build a lid-like structure 34 extending from the substrate 2 to an upper surface of the deposit of the bead 33B.  FIG21 is a view for explaining building of a deposit by the additive manufacturing apparatus 1 according to a first modification of the sixth embodiment of the present invention. In the first modification of the sixth embodiment, the additive manufacturing apparatus 1 stacks the beads 33A in the oblique direction such that a deposit of the bead 33A reaches a structure 34B located ahead in the set direction. The structure 34B may be a structure placed on the substrate 2 or may be an upward protruding portion of the substrate 2.
view
35
lid-like structure
2
substrate
34
lid-like structure
['1. An additive manufacturing apparatus (1) for building a deposit on a substrate (2), the apparatus comprising: a feeding unit (6, 8) to feed a build material (7) to a feeding position; an irradiation unit (10, 11, 12) to irradiate the feeding position with a laser beam that melts the build material; a control unit (3) to perform control for building the deposit by stacking beads formed by movement of the feeding position with respect to the substrate and melting of the build material; and an arithmetic unit (4) to execute an arithmetic process of computing parameters for the control unit to perform the control, wherein the beads include two beads (22-1, 22-2) stacked on each other, the two beads are a first bead (22-1) and a second bead (22-2) stacked on the first bead, the first bead being formed earlier than the second bead, the feeding position being a first position (C1) in formation of the first bead, the feeding positon being a second position (C2) in formation of the second bead,  characterized in that  the arithmetic unit calculates an interval (KS) between the first position and the second position in a set direction on a basis of a width (BW) of the first bead and a diameter (LD) of the laser beam, the set direction being a direction of the width of the first bead, and the control unit performs control for setting the second position to a position shifted from the first position in the set direction by the interval, so as to allow a part of the second bead to protrude from the first bead in the set direction.']