发明申请
- 专利标题: TWIST DRILL
- 专利标题(中): 麻花钻
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申请号: US12681714申请日: 2008-10-22
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公开(公告)号: US20100215452A1公开(公告)日: 2010-08-26
- 发明人: Masaaki Jindai , Yoshiji Sato , Makoto Abe
- 申请人: Masaaki Jindai , Yoshiji Sato , Makoto Abe
- 优先权: JP2007-278427 20071026
- 国际申请: PCT/JP2008/069118 WO 20081022
- 主分类号: B23B51/02
- IPC分类号: B23B51/02
摘要:
A flute spread angle θ in a drill axis-perpendicular section of a spiral flute is defined, a region of the flute taking part in chip treatment is formed along a first circle along an cutting edge of a concave curve and a second circle inscribed in this circle, both of the first circle and the second circle are circumscribed on a third circle expressing the web thickness, the radius R of the first circle and the radius R1 of the second circle are in the range of 0.40 D to 0.70 D and in the range of 0.15 D to 0.30 D respectively, and a drill rotational direction front portion of the spiral flute is formed on the second circle to be closer to the drill center than a fourth circle having a diameter of 0.65 D.
公开/授权文献
- US08545141B2 Twist drill 公开/授权日:2013-10-01