公开(公告)号：US5967707A

公开(公告)日：1999-10-19

申请号：US124482

申请日：1998-07-29

Applicant: Fred R. Larson

Inventor： Fred R. Larson

IPC: B23B51/06 ,  B23B51/00 ,  B23B51/02 ,  B23B51/04 ,  B23B35/00

CPC classification number: B23B51/02 ,  B23B51/04 ,  B23B2251/14 ,  B23B2251/201 ,  B23B2251/56 ,  Y10T408/03 ,  Y10T408/5586 ,  Y10T408/9095

Abstract: A short-hole drill bit and short-hole drilling method in which a drill bit has a unitary body with a substantially V-shaped flute and a support pad are provided. The unitary body has a shank portion and a working portion. The flute extends axially along the working portion, and defines a cutting edge and a passive edge at the body periphery. The support pad is located along a portion of the body periphery. The support pad is located with respect to the cutting edge based on a normal cutting force and a tangential cutting force at the cutting edge. The resultant cutting force is directed at the support pad to cause the support pad to center the short-hole drill bit during operation.

Abstract translation: 一种短孔钻头和短孔钻孔方法，其中钻头具有基本上为V形的长槽和支撑垫的整体。 整体具有柄部和工作部。 凹槽沿着工作部分轴向延伸，并且在主体周边处限定切割边缘和被动边缘。 支撑垫沿着身体周边的一部分定位。 基于正常的切削力和切削刃处的切向切削力，支撑垫相对于切削刃定位。 所得到的切割力指向支撑垫，以在操作期间使支撑垫使短孔钻头居中。