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公开(公告)号：EP0136912A1
公开(公告)日：1985-04-10
申请号：EP84306722.4
申请日：1984-10-02
CPC分类号： B21K1/56 , F16B25/0084 , F16B25/103
摘要： A self-drilling screw (1) having a head at one end and a forged drilling end configuration at the other. The drilling end configuration comprises a pair of longitudinally extending flutes (9) which are separated by land portions (8) and which extend through a tapered tip end (5) to form two cutting edges (21). The forging operation is performed in such a way as to promote complete formation of the tip end (5) and that may be achieved by inhibiting material flow away from that tip end (5) or by promoting extrusion of material towards the tip end (5). The drilling end portion (16) of the screw (1) is of elliptical cross section having a minor axis in the region of 60 to 80% of the major axis, and a fillet (22) is formed in the base of each flute (9) at the tip end portion of the flute (9). Each fillet (22) has a flat surface (23) arranged generally parallel to the screw axis and angularly relative to the adjacent cutting edge (21) of the tip end (5). At least one interuption (11), which may be a depression or a projection, is formed on each of a plurality of side surfaces (8) of the drilling end portion (16). Also, each flute (9) may comprise two end to end portions (14, 15) which extend at different angles to the longitudinal axis of the screw (1).
摘要翻译： 自钻螺钉（1），其一端具有头部，另一端具有锻造的钻孔端构造。 钻孔端构造包括一对纵向延伸的槽纹（9），它们由陆部（8）分开并延伸穿过锥形尖端（5）以形成两个切割刃（21）。 锻造操作以促进顶端（5）的完全形成的方式进行，并且可以通过抑制远离该尖端（5）的材料流动或通过促进材料朝向顶端（5）挤出来实现 ）。 螺杆（1）的钻孔端部（16）具有椭圆形横截面，其短轴在长轴的60至80％的范围内，并且在每个凹槽的基部中形成圆角（22） （9）的尖端部分。 每个圆角（22）具有大致平行于螺杆轴线并且相对于尖端（5）的相邻切削刃（21）成角度地布置的平坦表面（23）。 在钻孔端部（16）的多个侧表面（8）的每一个上形成至少一个可以是凹陷或突起的插入件（11）。 此外，每个槽（9）可以包括两个端部与端部（14,15），其以与螺钉（1）的纵向轴线不同的角度延伸。
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公开(公告)号：EP0136912B1
公开(公告)日：1989-12-20
申请号：EP84306722.4
申请日：1984-10-02
CPC分类号： B21K1/56 , F16B25/0084 , F16B25/103
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