Metal laminating and modeling method
A metal laminating and modeling method includes a first inclination angle modeling step including a first inclination step of setting a table on which the metal layers are to be formed at a first table inclination angle and setting a welding torch at a first torch inclination angle and a first welding step of forming a weld bead that becomes a part of the modeled object by arc welding with the welding torch and a second inclination angle modeling step including a second inclination step of inclining the table at a second table inclination angle that is larger than the first table inclination angle and setting the welding torch at a second torch inclination angle and a second welding step of forming the weld bead.
1. A metal laminating and modeling method for forming a modeled object by sequentially laminating metal layers, the method comprising:
a metal layer formation step of forming a plurality of weld beads formed by arc welding so as to be arranged in a horizontal direction, thereby forming a metal layer on a table,
wherein the metal layer formation step includes:
a first inclination angle modeling step of forming the plurality of the weld beads by setting a table inclination angle of the table and a torch inclination angle of a welding torch; and
a second inclination angle modeling step of forming the plurality of the weld beads by setting at least one of the table inclination angle and the torch inclination angle to a different value from that values of the table inclination angle and the torch inclination angle in the first inclination angle modeling step,
wherein the table inclination angle is an angle formed by a horizontal plane and an upper surface of the table,
wherein the torch inclination angle is an angle between a rotating axis of the welding torch extending in a vertical direction and a central axis of the welding torch,
wherein the first inclination angle modeling step includes:
a first inclination step of setting the table on which the metal layers are to be formed at a first table inclination angle and setting the welding torch at a first torch inclination angle; and
a first welding step of forming the weld beads that become a part of the modeled object by the arc welding with the welding torch,
wherein the plurality of the weld beads are formed so as to overlap each other in a direction in which an upper surface of the table is extending in the first welding step,
wherein the second inclination angle modeling step includes:
a first direction inclination step of inclining the table at a second table inclination angle that is larger than the first table inclination angle and setting the welding torch at a second torch inclination angle set according to the second table inclination angle,
wherein the table is inclined at the second table inclination angle so that the upper surface faces in a first inclination direction that intersects with the vertical direction in the first direction inclination step,
a second welding step of forming the weld beads by the arc welding with the welding torch, and
a second direction inclination step of tilting the table at the second table inclination angle so that a central axis of the table is returned to the vertical direction from the first inclination direction and then inclined in a second tilting direction, which is the opposite direction of the first inclination direction, after the second welding step,
wherein, in the second welding step, a first end portion weld bead is formed so as to overlap the weld bead that is located at a farthest end and above in the vertical direction among the plurality of weld beads formed in the first welding step,
wherein the second inclination angle modeling step further includes a second end portion weld bead formation step of forming a second end portion weld bead so as to overlap the weld bead located at an end on a side opposite to a side on which the first end portion weld bead is formed and above in the vertical direction among the plurality of weld beads formed in the first welding step,
wherein the second end portion weld bead formation step is carried out after the second direction inclination step,
wherein the metal laminating and modeling method further comprises:
a third inclination angle modeling step including a third inclination step of inclining the table at a third table inclination angle that is larger than the first table inclination angle such that the first end portion weld beads are disposed above after a plurality of the metal layers is formed by executing the first inclination angle modeling step and the second inclination angle modeling step a plurality of times; and
a third welding step of forming a side surface of the modeled object by forming a plurality of outer circumferential surface weld beads on a plurality of first end portion weld beads by arc welding with the welding torch, and
wherein in the third welding step, the plurality of outer circumferential surface weld beads are formed so as to overlap the plurality of first end portion weld beads, and protrusions and recesses on a surface of the plurality of first end portion weld beads are buried by the plurality of outer circumferential surface weld beads.
2. The metal laminating and modeling method according to claim 1 ,
wherein a current that is supplied to the welding torch in the second welding step has a current value smaller than a current that is supplied to the welding torch in the first welding step.
3. The metal laminating and modeling method according to claim 1 ,
wherein the first inclination angle modeling step and the second inclination angle modeling step are executed a plurality of times so as to laminate the weld beads on the formed metal layers.