Press molds and methods for manufacturing cylindrical parts

Abstract

To provide a technique capable of manufacturing a cylindrical component open at both ends and high in shape quality from a one-end bottomed cylindrical workpiece having a non-circular bottom wall.SOLUTION: A press mold 10 comprises: a punch 11 that is for pressuring a bottom wall 91 so as to form a R shape of an outer edge corner 93 of a one-end bottomed cylindrical workpiece 90 similar to a sharp square shape and pushed into the inside of the cylindrical workpiece 90; a die 13 that has a workpiece reception hole 12 into which the cylindrical workpiece 90 is pushed by the punch 11; a counter punch 14 that holds and pressurizes the bottom wall 91 cooperatively with the punch 11 in the workpiece reception hole 12, and causes the thickness of the bottom wall 91 to flow to the outer edge corner 93 side; and a recess 15 formed in at least one of the pressurizing surfaces of the counter punch 14 and the punch 11, and used for receiving an excess thickness flowing due to pressurization.SELECTED DRAWING: Figure 2

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