Three-dimensional shaping device and three-dimensional shaped object manufacturing method

1 . A three-dimensional shaping device, comprising:

a nozzle having a nozzle opening and configured to discharge a shaping material from the nozzle opening toward a stage;

a first motor configured to change a relative position between the nozzle and the stage;

a discharge amount adjusting valve provided in a flow path which is in communication with the nozzle opening and through which the shaping material flows, and configured to adjust a discharge amount of the shaping material from the nozzle opening by changing an opening area of the flow path;

a pressure adjusting assembly including a branch flow path coupled to the flow path between the discharge amount adjusting valve and the nozzle opening, a plunger, and a second motor configured to move the plunger in the branch flow path, the plunger being movable in a movable range in the branch flow path;

a memory configured to store a program; and

a processor configured to execute the program so as to:

execute an absorption operation of absorbing the shaping material in the flow path into the branch flow path and a delivery operation of delivering the shaping material absorbed into the branch flow path to the flow path, by moving the plunger when shaping one partial shaped object having a continuous linear shape along a shaping section for shaping the one partial shaped object and by controlling the first motor, the discharge amount adjusting valve, and the second motor;

move the plunger to a reference position by controlling the second motor, the reference position being an intermediate position in the movable range of the plunger;

cause the nozzle to start shaping of the one partial shaped object having the continuous linear shape after the processor sets the plunger at the reference position; and

cause the nozzle to end the shaping of the one partial shaped object having the continuous linear shape such that the plunger stops at the reference position in the branch flow path.

2 . The three-dimensional shaping device according to claim 1 , wherein

the shaping section includes an acceleration section in which a relative movement speed of the nozzle with respect to the stage is accelerated and a deceleration section in which the relative movement speed is decelerated, and

the processor is further configured to control a displacement of the plunger which occur due to the movement of the plunger corresponding to the acceleration section and a displacement of the plunger which occur due to the movement of the plunger corresponding to the deceleration section such that:

the processor causes the nozzle to start shaping of the one partial shaped object having the continuous linear shape after the processor set the plunger at the reference position; and

the plunger stops at the reference position in the branch flow path when the processor causes the nozzle to end the shaping of the one partial shaped object having the continuous linear shape.

3 . The three-dimensional shaping device according to claim 2 , wherein

the processor is further configured to:

cause the second motor to move the plunger to execute one of the absorption operation and the delivery operation during a first period of time in which the relative movement speed is accelerated from a first speed to a second speed;

cause the second motor to move the plunger to execute the other of the absorption operation and the delivery operation during a second period of time in which the relative movement speed is decelerated from the second speed to the first speed; and

control the second motor such that a movement amount of the plunger during the first period of time matches with a movement amount of the plunger during the second period of time.

4 . The three-dimensional shaping device according to claim 1 , wherein

in a specified section in the shaping section in which relative movement of the nozzle with respect to the stage at a constant movement speed is instructed by the processor, the processor is further configured to execute at least one of:

a first operation of discharging the shaping material from the nozzle opening, without controlling the pressure adjusting assembly, in a state where the flow path is opened by the discharge amount adjusting valve;

a second operation of discharging the shaping material from the nozzle opening by controlling the pressure adjusting assembly to execute the delivery operation in a state where the flow path is opened by the discharge amount adjusting valve; and

a third operation of discharging the shaping material from the nozzle opening by controlling the pressure adjusting assembly to execute the delivery operation in a state where the flow path is closed by the discharge amount adjusting valve.

5 . The three-dimensional shaping device according to claim 4 , wherein

the processor is further configured to control the discharge amount adjusting valve to make an opening area in the second operation smaller than an opening area in the first operation.

6 . The three-dimensional shaping device according to claim 4 , wherein

the processor is further configured to execute at least one of the second operation and the third operation before the first operation.

7 . The three-dimensional shaping device according to claim 1 , wherein

when increasing the discharge amount, the processor is further configured to execute an operation of increasing an opening area in a stepwise manner by controlling the discharge amount adjusting valve.