Three-dimensional forming apparatus and three-dimensional forming method

A three-dimensional forming method comprising:

• supplying a green sheet obtained by forming a sintering material in which metal powder and a binder are kneaded into a sheet shape;
• forming a single layer by transpiring and removing a part of the green sheet through radiation of first energy to the green sheet to form a removed portion and by radiating second energy toward the green sheet and sintering a part of the green sheet to form a sintered portion;
• stacking the single layer formed in the forming of the single layer as a first single layer and stacking the single layer as a second single layer in the forming of the single layer;
• and
• removing an unsintered portion from a stacked body including a three-dimensional fabricated object in which the sintered portions are stacked by repeating the stacking of the single layer a predetermined number of times.

A three-dimensional forming apparatus comprising:

• a material supply device serving as a material supply unit that arranges a green sheet obtained by forming a sintering material in which metal powder and a binder are kneaded into a sheet shape on a stage, the material supply device including
• a sheet holding unit holding the green sheet placed on a supply table and
• a supply driving unit moving the sheet holding unit relative to the supply table,
• wherein a sintering device serving as a first heating unit that supplies first energy transpiring a part of the green sheet and a second heating unit that supplies second energy capable of sintering apart of the green sheet includes a base, a stage movable three-dimensionally relative to the base, and a heating device heating the green sheet transferred to the stage to be stacked, and
• wherein the first energy is supplied from the first heating unit to the green sheet so that a sintering region to be sintered with the second energy supplied from the second heating unit in the green sheet supplied to the stage by the material supply unit is surrounded.