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    HIGH-SPEED PROCESSING TAP
    1.
    发明公开
    HIGH-SPEED PROCESSING TAP 有权
    HIGH-SPEED DRILL

    公开(公告)号：EP1611983A8

    公开(公告)日：2006-05-10

    申请号：EP04716346.4

    申请日：2004-03-02

    申请人： Yamawa Mfg. Co., Ltd. ,  Kennametal, Inc.

    发明人： AKAKI, S., Yamawa Mfg. Co., Ltd. ,  MITSUI, M., Yamawa Mfg. Co., Ltd. ,  HENDERER, Willard E.

    IPC分类号： B23G5/06

    CPC分类号： B23G5/06 ,  Y10T408/90467 ,  Y10T408/906

    摘要： A high-speed forming tap (1) for cutting and forming a female screw by cutting edges (E) of a screw portion (2) fed in synchronous with the rotation of a machine tool. The high-speed forming tap is characterized in that chamfers (CF) are provided at a bevel lead (2a) of the screw part (2). The chamfers (CF) start from the cutting edge (E) and are provided along ridgelines (R) between a crest face (2e) and flanks, or a following flank (2c) and a leading flank (2d). This structure enables the shape of the edges of the tap leading portion to be stably maintained and high-speed, smooth female screw cutting with high accuracy, and provides a tap with long life.