Plasticization device, three-dimensional modeling device, and injection molding device

A three-dimensional modeling device, comprising:

• a plasticization device configured to plasticize a material into a molten material;
• and
• a nozzle configured to discharge the molten material supplied from the plasticization device toward a stage, wherein
• the plasticization device includes:
• a screw configured to rotate around a rotation axis and including a groove forming surface in which a groove is formed, the groove extending spirally, the rotation axis extending along a first direction, the groove being recessed from the groove forming surface toward an opposite surface of the screw with respect to the groove forming surface;
• a heater configured to heat the material supplied to the groove;
• and
• a barrel including a facing surface that faces the groove forming surface and that is provided with a discharge port through which the molten material is supplied to the nozzle due to rotation of the screw and due to heating of the heater,
• the groove is configured with a inner side surface, a second inner side surface inwardly directly facing the first side surface, and a bottom surface coupled between the first inner side surface and the second inner side surface in a first part of a cross section of the screw along a plane extending along the first direction and having the rotation axis,
• the first inner side surface and the second inner side surface are inclined with respect to the rotation axis in the first part of the cross section of the screw,
• a length of the bottom surface in the first part of the cross section of the screw is larger than a distance between a first point and a second point in the first part of the cross section of the screw, and
• a lower end of the first inner side surface and the groove forming surface are connected at the first point in the first part of the cross section of the screw, and a lower end of the second inner side surface and the groove forming surface are connected at the second point in the first part of the cross section of the screw.

An injection molding device, comprising:

• a plasticization device configured to plasticize a material into a molten material;
• and
• a nozzle configured to inject the molten material supplied from the plasticization device into a mold, wherein
• the plasticization device includes:
• a screw configured to rotate around a rotation axis and including a groove forming surface in which groove is formed, the groove extending spirally, the rotation axis extending along a first direction, the groove being recessed from the groove forming surface toward an opposite surface of the screw with respect to the groove forming surface;
• a heater configured to heat the material supplied to the groove;
• and
• a barrel including a facing surface that faces the groove forming surface and that is provided with a discharge port through which the molten material is supplied to the nozzle due to rotation of the screw and due to heating of the heater,
• the groove is configured with a first inner side surface, a second inner side surface inwardly directly facing the first inner side surface, and a bottom surface coupled between the first inner side surface and the second inner side surface in a first part of a cross section of the screw along a plane extending along the first direction and having the rotation axis,
• the first inner side surface and the second inner side surface are inclined with respect to the rotation axis in the first part of the cross section of the screw,
• a length of the bottom surface in the first part of the cross section of the screw is larger than a distance between a first point and a second point in the first part of the cross section of the screw, and
• a lower end of the first inner side surface and the groove forming surface are connected at the first point in the first part of the cross section of the screw, and a lower end of the second inner side surface and the groove forming surface are connected at the second point in the first part of the cross section of the screw.