MOLDING DIE DEVICE OF GREEN COMPACT OF CURVED PLATE-LIKE COMPONENT

PROBLEM TO BE SOLVED: To compress and mold raw powder of high hardness such as magnetic powder at a high pressure without generating a crack starting from an inner corner part of a die even when compression molding is carried out at the high pressure.SOLUTION: A recessed-shape cavity 30 is formed on an outer circumference surface 21 of a core rod 20. The raw powder, which is supplied to the cavity 30 by upper and lower punches slidably inserted in the cavity 30, is compressed to mold the green compact of the curved plate-like component. By forming the right-angled inner corner part 34 of the cavity 30 by an inner circumference surface 11 of a dice 10 and the outer circumference surface 21 of the core rod 20, stress applied on the inner corner part 34 in compression molding is leaked to a joint boundary surface 60 of the inner circumference surface 11 of the dice 10 and the outer circumference surface 21 of the core rod 20 to prevent generation of the crack starting from the inner corner part 34, and mold at the high pressure.