ADDITIVE MANUFACTURING APPARATUS AND ADDITIVE MANUFACTURING METHOD
FIG15 is a hardware configuration diagram of an arithmetic device of the additive manufacturing apparatus illustrated in FIG1  FIG16 is a view for explaining correction to parameters in the additive manufacturing apparatus according to a second embodiment of the present invention  FIG14 is a hardware configuration diagram of a numerical control device of the additive manufacturing apparatus illustrated in FIG1
FIG15 is a hardware configuration diagram of the arithmetic device 4 of the additive manufacturing apparatus 1 illustrated in FIG1. An arithmetic function of the arithmetic device 4 is implemented by a processor 111 executing a program stored in a memory 112. The processor 111 is a CPU, a processing device, an arithmetic device, a microprocessor, a microcomputer, or a DSP. A function of the arithmetic device 4 is implemented by the processor 111, and software, firmware, or a combination of software and firmware. The software or the firmware is described as a program and stored in the memory 112. The memory 112 is a built-in memory, for example, a nonvolatile or volatile semiconductor memory such as a RAM, a ROM, a flash memory, an EPROM, or an EEPROM. A display 113 displays a display screen relating to an arithmetic process.  In second and third embodiments, examples in which correction to parameters is made on the basis of measured values obtained by the measurement device 17 will be described. FIG16 is a view for explaining correction to parameters in the additive manufacturing apparatus 1 according to the second embodiment of the present invention. In the second embodiment, the measurement device 17 measures a value BWR/2 of the half width BW/2 of the bead 22 or a value OHR of the protrusion amount OH thereof. On the basis of the measured value BWR/2 or the measured value OHR of the protrusion amount OH, the movement amount KS is corrected. In the second embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and a difference of the second embodiment from the first embodiment will mainly be described. In FIG16, the measured value BWR/2 of the bead 22-1 and the measured value OHR of the bead 22-3 are illustrated. When BW/2>BWR/2 holds, the arithmetic device 4 corrects the movement amount KS stored in the database, to KS'=KS+{(BW-BWR)/2}×α. Alternatively, when OH>OHR holds, the arithmetic device 4 corrects the movement amount KS stored in the database, to KS'=KS+(OH-OHR)×β. α and β are numerical values of 1 or more and 2 or less, and are arbitrarily set numerical values. The arithmetic device 4 stores in the database the corrected movement amount KS', and α and β set in calculating the movement amount KS'. The arithmetic device 4 may correct the movement amount KS through an arithmetic operation other than that in accordance with the above formula.  FIG14 is a hardware configuration diagram of the numerical control device 3 of the additive manufacturing apparatus 1 illustrated in FIG1. A control function of the numerical control device 3 is implemented by a processor 101 executing a program stored in a memory 102. The processor 101 is a central processing unit (CPU), a processing device, an arithmetic device, a microprocessor, a microcomputer, or a digital signal processor (DSP). A function of the numerical control device 3 is implemented by the processor 101, and software, firmware, or a combination of software and firmware. The software or the firmware is described as a program and stored in the memory 102. The memory 102 is a built-in memory, for example, a nonvolatile or volatile semiconductor memory such as a random access memory (RAM), a read only memory (ROM), a flash memory, an erasable programmable read only memory (EPROM), or an electrically erasable programmable read only memory (EEPROM (registered trademark)). A display 103 displays a display screen relating to the control of the additive manufacturing apparatus 1.
diagram, view
103
display
5
storage device
2
substrate
['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.']