Patent ID: 11931968
Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHA
Field: Other special machines (Mechanical engineering)
Classification: CPC B | IPC B

Claim 16:
17. A three-dimensionally laminated object modeling method in a three-dimensionally laminated object modeling apparatus, the three-dimensionally laminated object modeling apparatus including a cylinder configured to store a molten resin, a discharging nozzle that is communicated with the cylinder, a piston configured to linearly reciprocate in the cylinder and discharge the molten resin from the discharging nozzle by moving in a direction of approaching the discharging nozzle with a piston drive device and by pressurizing the molten resin in the cylinder, a pressure sensor configured to detect an actually-measured pressure that is a pressure applied to the molten resin, and a nozzle drive device configured to relatively move the discharging nozzle with respect to a table on which a three-dimensionally is modeled by laminating a resin bead that is the molten resin discharged from the discharging nozzle, the three-dimensionally laminated object modeling method comprising controlling movement of the piston by a piston controlling process which includes:
executing a preparation process including
acquiring a nozzle movement speed input,

determining an indicated flow rate based on the nozzle movement speed, the indicated flow rate being a target value of a flow rate of the molten resin discharged from the discharging nozzle,
calculating, based on the indicated flow rate, a target pressure applied to the molten resin, and
acquiring the actually-measured pressure,

after executing the preparation process, executing a first process including
calculating an additional pressure by subtracting the actually-measured pressure from the target pressure,
calculating a first piston movement speed for pressurizing based on the additional pressure and a bulk modulus that is a constant determined by characteristics of the molten resin,
calculating a predicted outflow rate based on the actually-measured pressure, the predicted outflow rate being an outflow rate of the molten resin predicted to be discharged from the discharging nozzle,
calculating a second piston movement speed for discharging based on the predicted outflow rate, and
causing the piston drive device to drive, wherein the piston is driven to move at a speed obtained by adding the first piston movement speed and the second piston movement speed, and

after executing the first process, repeatedly executing a second process including
acquiring the actually-measured pressure,
calculating a corrected value of the bulk modulus based on the actually-measured pressure acquired in the second process, and
executing the first process using the corrected value as the bulk modulus.