Rotary drill bit
    73.
    发明公开
    Rotary drill bit 失效
    旋挖钻机。

    公开(公告)号:EP0082122A2

    公开(公告)日:1983-06-22

    申请号:EP82850231.0

    申请日:1982-11-15

    申请人: Santrade Ltd.

    IPC分类号: B23P15/28 E21B10/22

    摘要: A rotary drill bit comprising a roller cutter (13) rotatably carried over a bearing system, which comprises a friction bearing (14). For purposes of ensuring sufficient hardness of the cooperating friction surfaces and lubrication thereof and optimizing cutting ability and fatigue resistance the bearing surface (28) of the roller cutter (13) is surface-hardened by means of a thermal hardening method and provided with a solid lubricant (27), and the bearing surface (29) of the bearing pin (12) is provided with a wear resistant deposit having higher wearability than the surface-hardened bearing surface.