PRESS-FORMING DEVICE, PRESS-FORMING METHOD USING SAME, AND ROTOR CORE OF ALTERNATING-CURRENT GENERATOR FOR AUTOMOBILE MANUFACTURED USING THIS PRESS-FORMING METHOD

摘要

[Objects] In a cold-press molding, a taper shape steel rod-like protruding material with a taper shape, the cold press molding apparatus can reduce burrs generated in between back-side tool without high grade lubrication films especially and can extend the life of the molding tool. [Means for Solving Problems] A cold press molding method of the present invention to make a taper shape steel rod-like protruding material is characterized by holding the processed material preshaped processed material 31a on a backside tool 32, while press-contacting the processed material the free rotation roll 41 freely rotating toward the tip element on the processed material 31a and shaping a taper shape by plastic-reshaping of the processed material.