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    • 106. 发明授权
    • Methods of forming earth-boring rotary drill bits
    • 形成钻孔旋转钻头的方法
    • US07802495B2
    • 2010-09-28
    • US11271153
    • 2005-11-10
    • James A. OxfordJimmy W. EasonRedd H. SmithJohn H. StevensNicholas J. Lyons
    • James A. OxfordJimmy W. EasonRedd H. SmithJohn H. StevensNicholas J. Lyons
    • B21K5/04E21B10/54
    • E21B10/00B22F7/062B22F7/08B22F2003/245B22F2005/001B22F2005/002B22F2998/10C22C29/08E21B10/62B22F3/1021B22F3/162
    • Methods of forming earth-boring rotary drill bits include providing a bit body, providing a shank that is configured for attachment to a drill string, and attaching the shank to the bit body. Providing a bit body includes providing a green powder component having a first region having a first composition and a second region having a second, different composition, and at least partially sintering the green powder component. Other methods include providing a powder mixture, pressing the powder mixture to form a green component, and sintering the green component to a final density. A shank is provided that includes an aperture, and a feature is machined in a surface of the bit body. The aperture is aligned with the feature, and a retaining member is inserted through the aperture. An earth-boring bit includes a bit body comprising a particle-matrix composite material including a plurality of hard particles dispersed throughout a matrix material. A shank is attached to the bit body using a retaining member.
    • 形成钻孔旋转钻头的方法包括提供钻头体,提供构造成用于附接到钻柱的柄,以及将柄连接到钻头体上。 提供有点体包括提供具有第一组分的第一区域和具有第二不同组成的第二区域并且至少部分地烧结绿色粉末组分的绿色粉末组分。 其他方法包括提供粉末混合物,挤压粉末混合物以形成绿色组分,并将绿色组分烧结至最终密度。 提供了一种柄,其包括孔,并且特征被加工在钻头体的表面中。 孔与该特征对准,并且保持构件插入穿过该孔。 一种钻孔钻头包括一个包括一颗粒基复合材料的钻头体,该复合材料包括分散在基体材料中的多个硬颗粒。 使用保持构件将柄连接到钻头体上。