公开(公告)号：US4579180A

公开(公告)日：1986-04-01

申请号：US610754

申请日：1984-05-16

申请人： Wolfgang Peetz ,  Siegried Klaissle ,  Bernhard Moser ,  August Hausmann

发明人： Wolfgang Peetz ,  Siegried Klaissle ,  Bernhard Moser ,  August Hausmann

IPC分类号： E21B10/44 ,  E21B17/22

CPC分类号： E21B17/22 ,  E21B10/445 ,  B23B2251/046

摘要： A drilling bit having two helical withdrawal grooves which extend from the drilling head in the direction toward the insertion or chucking end. The withdrawal grooves have least slope in the vicinity of the drilling head. In the other regions, the withdrawal grooves have a different slope. As a result, no cross-sectional jumps disposed at uniform intervals are provided on the drilling bit, so that transverse oscillations cannot be reinforced by partially constantly or continuously reflected pulses. A considerable reduction in noise is achieved. Furthermore, the central portion of the drilling bit, which is critical during drilling, receives great rigidity.

摘要翻译： 钻头具有从钻头朝向插入或夹紧端的方向延伸的两个螺旋取出槽。 退出槽在钻头附近具有最小的斜度。 在其他区域中，退出槽具有不同的斜率。 结果，在钻头上没有设置均匀间隔的横截面跳跃，使得横向振荡不能通过部分恒定或连续反射的脉冲来加强。 实现了相当大的噪音降低。 此外，钻孔的中心部分在钻井过程中是关键的，具有很大的刚度。