Patent ID: 6645426
Filing Date: 2003-11-11
Classification: B22F,B28B,B30B

Abstract:
A method for manufacturing a green compact, comprising:a step of filling material powder into a cavity formed of a die having in a vertical direction a die hole in a shape matching a contour of said green compact including a through-hole at a part connected continuously to a base part and a lower punch inserted from an underside of said die into said die hole; a step of obtaining a preform by temporarily compressing the material powder filled in said cavity by means of an upper punch inserted from an upside of said die into said die hole and said lower punch; a step of punching out a shape of said through-hole by inserting a punch-out pin having a shape corresponding to a cross-section of said through-hole into said preform; a step of obtaining said green compact by pressurizing and compressing said preform by means of both of said upper and lower punches in a state in which said punch-out pin is being inserted; a step of pulling out said punch-out pin from said green compact; and a step of taking out said green compact from said cavity.