Investment casting of hollow components

A method for producing a cast component (2), which has cavity structures (22), using a 3D pattern of digital geometrical coordinates of the cast component by means of a ceramic mold (16), said method comprising the following steps:

• a) producing the core (4) according to the 3D pattern by CNC technology in a first CNC production method;
• b) positioning the core (4) in a treatment support (6);
• c) casting the pattern material (10) around the core (4) in a volume (8) that is larger than the cubature of the cast component (12), which according to the 3D pattern is spatially defined by the position of the core (4) in the treatment support (6), and allowing the pattern material (10) to solidify;
• d) producing an outer contour of a disposable pattern (14) of the cast component from the solidified pattern material (10) around the core (4) according to the 3D pattern by CNC technology in a second CNC production method;
• e) applying a ceramic mold (16) to the outer contour of the disposable pattern (14) and forming a positioning connection (18) of the ceramic mold (16) and the treatment support (6);
• f) removing the disposable pattern (14) from the ceramic mold (16) around the core (4) in the treatment support (6);
• g) casting metal into the ceramic mold (16) around the core (4) in the treatment support (6);
• h) allowing the molten metal to solidify to the solid cast component and
• i) removing the ceramic mold (16) and the core (4) from the cast component.