PURPOSE: To enable preliminary machining and shearing to be carried out in one process by performing at first, said preliminary machining in which grooves are formed at a prescribed interval on the whole periphery of the side surface of a wire material by use of a blade which revolves in the direction perpendicular to the axis core of the wire material and by performing shearing work along said grooves by use of a shearing tool.

CONSTITUTION: A wire material M is shifted by a prescribed distance in the direction of arrow B, and grooves MA are cut successively by the turning of a cutting tool 8. When a cylindrical body 6 is retreated, the cutting tool 8 and a roller 12 are separated from the wire material M. When the grooves MA are formed at a prescribed interval by the repetition of the operation described the above, the material is inserted into a shearing tool 2 through a supporting die 1 and sheared by the sliding of the tool 2 in the direction of arrow C, and then discharged.