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    • 5. 发明授权
    • Polycrystalline diamond cutting element
    • 多晶金刚石切割元件
    • US5848657A
    • 1998-12-15
    • US777213
    • 1996-12-27
    • Gary Martin FloodDavid Mark JohnsonFriedel Siegfried KnemeyerBradley Earl Williams
    • Gary Martin FloodDavid Mark JohnsonFriedel Siegfried KnemeyerBradley Earl Williams
    • E21B10/52E21B10/56E21B10/567E21B10/573E21B10/46
    • E21B10/5673E21B10/52E21B10/5735
    • The present invention relates to a novel domed polycrystalline diamond cutting element wherein a hemispherical diamond layer is bonded to a tungsten carbide substrate, commonly referred to as a tungsten carbide stud. Broadly, the inventive cutting element includes a metal carbide stud having a proximal end adapted to be placed into a drill bit and a distal end portion. A layer of cutting polycrystalline abrasive material disposed over said distal end portion such that an annulus of metal carbide adjacent and above said drill bit is not covered by said abrasive material layer. The geometry of the diamond cutting element provides control of interfacial stresses and reduces fabrication costs. The diamond cutting element may contain a pattern of ridges or bumps integrally formed in the abrasive layer which ridges are designed to cause high localized stresses in the rock, thus starting a crack. By initiating cracks in localized areas, the crushing action could be performed with less force.
    • 本发明涉及一种新颖的圆顶多晶金刚石切割元件,其中半球形金刚石层结合到通常称为碳化钨螺柱的碳化钨基底上。 广义地说,本发明的切割元件包括金属硬质合金柱,其具有适于放置在钻头和远端部分中的近端。 一层切割多晶磨料,设置在所述远端部分上方,使得邻近和高于所述钻头的金属碳化物的环形空间未被所述研磨材料层覆盖。 金刚石切割元件的几何形状提供对界面应力的控制并降低制造成本。 金刚石切割元件可以包含在研磨层中一体形成的脊或凸起的图案,其中脊被设计成在岩石中引起高的局部应力,从而开始裂纹。 通过在局部区域中引发裂纹,可以以较小的力进行破碎作用。