| 摘要 |
PROBLEM TO BE SOLVED: To prevent breaking down of a punch due to molding pressure while molding a self-drilling screw vane in a given measurement without fail. SOLUTION: This invention is referred to a vaned drill part manufacture device wherein a punch 30, having a forge molding face 31 for forge molding a drill part, discharge grooves and a vane, is arranged in a vaned self drilling screw to which a cutting blade is formed along the two discharge grooves formed on a drill part and a non screw part. A top end of a vane forming part 34 for forming the vane is slanted downwardly to outer direction while the top end is closed. Because of this structure, right and left vanes being formed simultaneously when the drill part is molded are always obtainable in the identical shape as meat is fully filled in the vane forming part and, the meat dose not overflow from the upper part of the punch. Thereby, even if screw threads are rolled on a foot part, an outer appearance is not fouled. Also, since the meat is easily filled in the vane forming part, a vane cutting blade is accurately formed.
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