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    • 10. 发明授权
    • Tooth type drill bit with secondary cutting elements and stress reducing tooth geometry
    • 带二次切割元件的齿型钻头和减少齿几何形状
    • US06347676B1
    • 2002-02-19
    • US09547525
    • 2000-04-12
    • Adrian Vuyk, Jr.
    • Adrian Vuyk, Jr.
    • E21B1016
    • E21B10/16
    • Disclosed is a tooth type rolling cutter earth boring drill bit with secondary cutting elements on the tooth surfaces. The secondary cutting elements provide additional, relatively sharp edges that help cut hard rock. The teeth also have convex radiused buttresses at their bases to reduce the stresses the teeth experience when drilling through extremely hard rock. This allows the tooth bit to survive the high loads encountered when drilling hard, tough rock formations, without breaking the teeth. The combination of teeth with secondary cutting elements and convex radiused buttresses at their base provide a tooth type rotary drill bit that has superior resistance to wear and breakage when drilling through hard, tough rock without significantly reducing the drilling rate of penetration when drilling through soft rock.
    • 公开了一种在牙齿表面具有次切割元件的齿型滚刀式钻孔钻头。 二次切割元件提供额外的相对锋利的边缘,有助于切割坚硬的岩石。 牙齿在其基部还具有凸形的弧形支撑,以减少当穿过极硬的岩石时牙齿所经受的应力。 这可以使钻头在钻破硬,坚硬的岩层时遇到的高负载下生存,而不会破坏牙齿。 齿与二次切割元件的组合以及在其底部的凸形弧形支撑件组合提供了一种齿型旋转钻头,当通过硬质坚硬的岩石钻孔时,具有优异的耐磨损和破损能力,而不会显着降低穿过软岩的钻孔率 。