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    • 3. 发明授权
    • Rotary drill bits
    • 旋转钻头
    • US4720371A
    • 1988-01-19
    • US854178
    • 1986-04-21
    • David Shirley
    • David Shirley
    • B22F5/10B22F7/06E21B10/46E21B10/56E21B10/567B22F3/26
    • E21B10/567B22F5/10B22F7/06E21B10/46B22F2005/001B22F2005/103
    • A method of manufacturing by a powder metallurgy process a rotary drill bit including a bit body having an external surface on which cutting elements are mounted, and a passage for supplying drilling fluid to the surface of the bit. The method comprises forming a hollow mould for moulding at least a portion of the bit body, packing at least part of the mould with powdered matrix material, and infiltrating the material with a metal alloy in a furnace to form a matrix. Before the mould is packed with the powdered material, formers are positioned on the interior surface of the mould to project into the interior of the mould space and form sockets to receive nozzles, or studs on which the cutting elements are mounted. According to the invention, the formers are formed from material, such as austenitic stainless steel, having a coefficient of thermal expansion not less than that of the matrix material. The formers may have a surface coating of a ceramic, such as boron nitride, or other material which does not wet or react with the binder alloy or matrix material.
    • 一种通过粉末冶金工艺制造的旋转钻头的方法,所述钻头包括具有安装切割元件的外表面的钻头体,以及用于向钻头表面供应钻井流体的通道。 该方法包括形成用于模制钻头体的至少一部分的中空模具,用粉末状基体材料填充模具的至少一部分,并在炉中用金属合金渗透材料以形成基体。 在模具填充粉末材料之前,成形器定位在模具的内表面上,以突出到模具空间的内部,并形成插座以接收其上安装切割元件的喷嘴或螺柱。 根据本发明,成形体由诸如奥氏体不锈钢的材料形成,其热膨胀系数不小于基体材料的热膨胀系数。 成型体可以具有陶瓷的表面涂层,例如氮化硼或不与粘合剂合金或基质材料一起湿润或反应的其它材料。
    • 4. 发明授权
    • Rotary drill bits
    • 旋转钻头
    • US4700790A
    • 1987-10-20
    • US706060
    • 1985-02-26
    • David Shirley
    • David Shirley
    • E21B10/56E21B10/573E21B10/62E21B10/58
    • E21B10/573E21B10/62Y10T29/49876Y10T29/49945
    • A rotary drill bit for use in drilling or coring deep holes in subsurface formations comprises a bit body having a shank for connection to a drill string, a plurality of cutting elements mounted at the surface of the bit body, and a passage in the bit body for supplying drilling fluid to the surface of the bit body. At least some of the cutting elements are each mounted on a stud which is received in a socket in the bit body, there being provided within the socket and disposed around at least a portion of the periphery of the stud resiliently compressible retaining means, such as a corrugated sleeve, which is formed separately from the stud and bit body and is resiliently compressed between the stud and the wall of the socket so as frictionally to retain the carrier in the socket.
    • 用于在地下构造中钻孔或取芯深孔的旋转钻头包括钻头体,其具有用于连接到钻柱的柄,安装在钻头体的表面处的多个切割元件和钻头体中的通道 用于将钻井液供给钻头体的表面。 至少一些切割元件分别安装在被接收在钻头体中的插座中的螺柱上,并且设置在该插座内并且设置在螺柱弹性可压缩保持装置的周边的至少一部分周围,例如 波纹套筒,其与螺柱和钻头体分开形成并且在螺柱和插座的壁之间弹性压缩,以便摩擦地将托架保持在插座中。