Lamination molding apparatus

A lamination molding apparatus comprising:

• a chamber that is closed;
• a laser radiation apparatus configured to radiate a laser beam to a predetermined irradiation region on a powder material layer formed by uniformly spreading a powder material in the chamber and form a sintered layer;
• and
• an inert gas supply/discharge apparatus configured to supply an inert gas into the chamber such that the chamber is always filled with the inert gas to a predetermined concentration or more and discharge fumes to the outside of the chamber,
• wherein the inert gas supply/discharge apparatus includes:
• an inert gas supply apparatus configured to supply the inert gas into the chamber;
• and
• a fume collector including a charging section having a charging electrode configured to positively or negatively charge the fumes, a charging electrode cleaner configured to remove the fumes adhered to the charging electrode, and a dust collecting section configured to collect the charged fumes,
• wherein the charging electrode cleaner removes the fumes when formation of the sintered layer is not being performed by the laser radiation apparatus in operation.