Method for manufacturing three-dimensional shaped object, and three-dimensional shaping apparatus
Provided is a method for manufacturing a three-dimensional shaped object, the manufacturing method including: a powder layer formation step of disposing powders containing a forming material of the three-dimensional shaped object in a layer shape and forming a powder layer having a predetermined thickness; and a molded body formation step of discharging, to the powder layer, a binder liquid containing a binder for binding the powders to one another, and forming a molded body in which the powders are bound to one another. In the molded body formation step, in a formation region of the molded body in the powder layer, a discharging amount of the binder liquid per unit area to a first formation region that is a contour portion of the formation region and a discharging amount of the binder liquid per unit area to a second formation region other than the contour portion are discharging amounts different from each other.
1 . A method for manufacturing a three-dimensional shaped object using a binder jet method, the manufacturing method comprising:
a powder layer formation step of disposing powders containing a forming material of the three-dimensional shaped object in a layer shape and forming a powder layer having a predetermined thickness;
a green body formation step of discharging, to the powder layer, a binder liquid containing a binder for binding the powders to one another, and forming a green body in which the powders are bound to one another; and
a sintering step of sintering the binder as a resin component such that the binder contained in the green body is de-bound by heating the green body,
wherein, in the green body formation step, in a formation region of the green body in the powder layer, the binder liquid is discharged to both a first region and a second region of the formation region, the first region is a contour portion of the formation region, and the second region is a region other than the contour portion of the formation region,
a discharging amount of the binder liquid discharged per unit area to the first region is set to be greater than the discharging amount of the binder liquid discharged per unit area to the second region,
the first region has an outermost periphery of the contour portion of the formation region, and the outermost periphery is divided into a plurality of positions in a plan view,
each of the plurality of positions corresponds to one unit area on which the binder liquid is discharged as a dot,
the discharging amount of the binder liquid per unit area is varied at each of the plurality of positions based on a plurality of configurations in which each of the plurality of positions exists as a configuration of the plurality of configurations, and
each of the plurality of positions corresponds to a tip of a protrusion, a bottom of a recess, a corner protruding toward an outside of the formation region, and one component of a straight line of the plurality of configurations.
2 . The method for manufacturing the three-dimensional shaped object using the binder jet method, according to claim 1 , wherein
in the green body formation step,
the discharging amount of the binder liquid per unit area is varied by changing a size of a droplet of the binder liquid.
3 . The method for manufacturing the three-dimensional shaped object using the binder jet method, according to claim 1 , wherein
in the green body formation step,
the discharging amount of the binder liquid per unit area is varied by changing the number of drops of the binder liquid.
4 . The method for manufacturing the three-dimensional shaped object using the binder jet method, according to claim 1 , wherein
the resin component is a thermosetting resin, and
the binder liquid contains water as a solvent.
5 . The method for manufacturing the three-dimensional shaped object using the binder jet method, according to claim 1 , wherein
the binder is a thermosetting resin that contains water as a solvent.