Rock bit cutter cones having metallurgically bonded cutter inserts
    2.
    发明公开
    Rock bit cutter cones having metallurgically bonded cutter inserts 失效
    Konisches Gesteinsschneidwerkzeug mit metallisch gebundenenSchneideinsätzen。

    公开(公告)号:EP0142941A1

    公开(公告)日:1985-05-29

    申请号:EP84307183.8

    申请日:1984-10-18

    IPC分类号: E21B10/52 E21B10/22 B22F7/08

    摘要: A rock bit cutter cone (10) for a drill bit (12) is disclosed wherein hard carbide cutter inserts (26) are metallurgically bonded into an interior core (28) of the cone through a cladding (34). The cladding (34) is bonded on to the exterior surface of the core (28) by a powder metallurgy process. The cladding (34) retains the inserts (26) in the core (28). A thin layer or coating (44) of a suitable metal, preferably nickel, is provided on the carbide insert (26) prior to mounting into the core (28). The coating (44) prevents degradation of the carbide through loss of carbon into the core (28) during the powder metallurgy process and accommodates mismatch of thermal expansion between the cutter insert (26) and the core (28). The interior of the cone is formed to provide bearing surfaces (34, 40) either by conventional techniques, or by powder metallurgy processes. Bearing surfaces formed in the interior of the core by powder metallurgy processes may be hard so as to permit an open bearing structure for the drill bit.

    摘要翻译: 公开了一种用于钻头(12)的钻头铣刀锥(10),其中硬质合金刀具刀片(26)通过包层(34)冶金地结合到锥体的内部芯(28)中。 包层(34)通过粉末冶金工艺结合在芯(28)的外表面上。 包层(34)将插入件(26)保持在芯部(28)中。 在安装到芯(28)之前,在碳化物插入件(26)上提供合适的金属(优选镍)的薄层或涂层(44)。 涂层(44)通过在粉末冶金过程期间通过将碳损失到芯(28)中来防止碳化物的降解,并且适应刀片插入件(26)和芯部(28)之间的热膨胀失配。 锥体的内部形成为通过常规技术或通过粉末冶金方法提供轴承表面(34,40)。 通过粉末冶金工艺在芯部内部形成的轴承表面可能是困难的,从而允许用于钻头的开放的轴承结构。