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    • 2. 发明授权
    • Burnishing drill
    • 抛光钻
    • US5312208A
    • 1994-05-17
    • US931323
    • 1992-08-18
    • Kiyotaka ShigaNobuya MatsushitaAkio FukuiTsunehisa YamashitaManabu Shimizu
    • Kiyotaka ShigaNobuya MatsushitaAkio FukuiTsunehisa YamashitaManabu Shimizu
    • B23B51/08B23B51/00B23D77/00B23B51/02
    • B23D77/00B23B51/00B23B2251/207Y10T408/906Y10T408/909
    • A burnishing drill includes a cylindrical shank and a drill body connected to the shank. Drilling edges, first reaming edges and second reaming edges are formed on a first reduced diameter portion, a second reduced-diameter portion and a third reduced-diameter portion respectively located at a foremost end of the drill body. Each of the reaming edges is inclined with respect to the longitudinal axis of the drill at an angle which is set so as to be within a range of between 5.degree. and 30.degree.. During a boring operation using the drill, a hole is drilled by the drilling edges and the drilled hole is then worked by the first reaming edges and the second reaming edges to provide a smooth inner wall in the drilled hole. Since each of the reaming edges is formed to extend radially outward from the foremost end of the drill and incline axially in the rearward direction at a relatively small angle, the centering property can be greatly improved.
    • 抛光钻具包括圆柱形柄和连接到柄的钻体。 钻头边缘,第一铰接边缘和第二铰孔边缘分别形成在分别位于钻体主体的最前端的第一缩径部分,第二缩径部分和第三缩径部分上。 每个铰孔边缘以相对于钻头的纵向轴线倾斜的角度设定为在5°和30°之间的范围内。 在使用钻头的钻孔操作期间,钻孔被钻孔钻出,然后钻孔通过第一铰孔边缘和第二铰孔边缘进行加工,以在钻孔中提供平滑的内壁。 由于每个铰孔边缘都形成为从钻头的最前端径向向外延伸并且以相对较小的角度沿向后方向轴向倾斜,所以可以大大提高定心特性。