| 摘要 |
PROBLEM TO BE SOLVED: To provide a method in which, when a pipe member is manufactured by a powder metallurgical method, a powdered material for pipe member is press-molded with uniform density in a powder molding process. SOLUTION: The powdered material 4 is pressed by a powder molding device 100 which includes: upper and lower punches 3A, 3B; dice 2; upper and lower mandrels 1A, 1B; and a core 6 of a drum-shaped elastic body sandwiched between the upper and lower mandrels 1A, 1B. For forming a tubular product by powder molding, the powdered material 4 is supplied to a gap between the die 2 and the core 6; the upper and lower mandrels 1A, 1B are driven to enlarge the diameters of the center of the core 6 and the periphery thereof while the powdered material 4 being pressed vertically by the upper and lower punches 3A, 3B which are driven to approach each other; the molding density of the center of the tubular molding and the periphery thereof is increased along the horizontal direction; and a powder molded tubular product with the molding density entirely uniform is manufactured. COPYRIGHT: (C)2011,JPO&INPIT
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