1. 1 800 18,000 140 900 12 1 3 50~100 () (Sand casting)(Lost-wax casting) ( Die casting)()( 1 ) / / 1 ( Die casting) (Lost-wax casting) (Sand casting) 2. 2 4 55 ( 2000 ) 3K () 1. (Pattern)(Casting mold): 2.: 3.(Melting)(Pouring):() 4.(Solidification) () 5.(Fettling): () 6.(Inspection): (): (Mold) 3. 3 (Sand mold) 2 2 (): 1.: 2.: 3.: 4.: 5.: 6.: 4. 4 (): 1. (1): (2): (3): (4) (5):(FA) (6): (7): 99% (8): 2. (1): (2): 1970 5. 5 (3)3D : 3D 3D 3D 3D 3D 3 3D 3D 33D