Importance

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Abstract

The present invention provides a slotting method in which, during production of a metal sheet V-pulley or the like, slitting can be correctly easily performed at an arbitrary position in the thickness direction of an outer peripheral face of a blank. A blank housing recess (5) a depth of which is smaller than the thickness of a disk-like metal blank (1) is formed in an upper face of a lower rotary die (4) on which the blank (1) is to be placed, and a roller die guiding face (6) which is lower in level than an upper face of the blank (1) in the blank housing recess (5) is horizontally formed in an outer periphery of the blank housing recess (5). The slotting roller die (11) has a blade edge (12) on its outer periphery, and, while the slotting roller die is rotated in synchronization with the blank (1) about the roller axis which is inclined with respect to the rotation axis of the upper and lower rotary dies (4), the blade edge (12) is slid on the roller die guiding face (6) in an inward radial direction to be pressed against an outer peripheral portion (10) of the blank (1) which is protruded from the blank housing recess (5), whereby the outer peripheral portion (10) is slit into two parts in the thickness direction to form slotted parts (10a, 10b).

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First Claim