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公开(公告)号：US5230593A
公开(公告)日：1993-07-27
申请号：US863373
申请日：1992-04-03
IPC分类号： B23B51/02
CPC分类号： B23B51/02 , B23B2251/18 , B23B2251/241 , B23B2251/406 , Y10T408/78 , Y10T408/9097
摘要： A twist drill includes a cylindrical body having an axis of rotation therethrough and having a forward end which contacts a workpiece. The body has a spiral flute formed in an outer peripheral surface thereof so as to extend spirally along a length thereof to the forward end and a land disposed adjacent to the flute. The flute has a first wall facing in the direction of rotation of the body and a second wall extending from an inner end of the first wall to the outer periphery of the body. The first wall terminates at the forward end in a first cutting lip having a radially outermost end disposed on the outer periphery of the body. The second wall is concavely shaped when viewed from the forward end and formed so that, assuming a first line extending from the outermost end perpendicular to a second line which connects the outermost end and the axis of the body, the maximum distance between the first line and the second wall is set to range between 0.45 D and 0.65 D, wherein D is a diameter of the body.
摘要翻译： 麻花钻包括具有穿过其中的旋转轴线的圆柱体，并且具有接触工件的前端。 本体具有形成在其外周表面中的螺旋槽，以便沿其长度螺旋地延伸到前端，以及邻近该凹槽设置的平台。 凹槽具有面向主体的旋转方向的第一壁和从第一壁的内端延伸到主体的外周的第二壁。 第一壁在前端处终止于具有设置在主体的外周上的径向最外端的第一切割唇缘中。 第二壁从前端观察时为凹形，并且形成为使得从最外端垂直于连接最外端和主体轴线的第二线延伸的第一线，第一线之间的最大距离 并且第二壁设定在0.45D和0.65D之间的范围，其中D是主体的直径。
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公开(公告)号：US5088863A
公开(公告)日：1992-02-18
申请号：US605353
申请日：1990-10-30
IPC分类号： B23B51/02
CPC分类号： B23B51/02 , B23B2251/18 , B23B2251/241 , B23B2251/406 , Y10T408/78 , Y10T408/9097
摘要： A twist drill includes a cylindrical body having an axis of rotation therethrough and having a forward end which contacts a workpiece. The body has a spiral flute formed in an outer peripheral surface thereof so as to extend spirally along a length thereof to the forward end and a land disposed adjacent to the flute. The flute has a first wall facing in the direction of rotation of the body and a second wall extending from an inner end of the first wall to the outer periphery of the body. The first wall terminates at the forward end in a first cutting lip having a radially outermost end disposed on the outer periphery of the body. The second wall is concavely shaped when viewed from the forward end and formed so that, assuming a first line extending from the outermost end perpendicular to a second line which connects the outermost end and the axis of the body, the maximum distance between the first line and the second wall is set to range between 0.45D and 0.65D, wherein D is a diameter of the body.
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公开(公告)号：US4983079A
公开(公告)日：1991-01-08
申请号：US283916
申请日：1988-12-13
IPC分类号： B23B51/02
CPC分类号： B23B51/02 , B23B2251/18 , B23B2251/241 , B23B2251/406 , Y10T408/78 , Y10T408/9097
摘要： A twist drill includes a cylindrical body having an axis of rotation therethrough and having a forward end which contacts a workpiece. The body has a spiral flute formed in an outer peripheral surface thereof so as to extend spirally along a length thereof to the forward end and a land disposed adjacent to the flute. The flute had a first wall facing in the direction of rotation of the body and a second wall extending from an inner end of the first wall to the outer periphery of the body. The first wall terminates at the forward end in a first cutting lip having a radially outermost end disposed on the outer periphery of the body. The second wall is concavely shaped when viewed from the forward end and formed so that, assuming a first line extending from the outermost end perpendicular to a second line which connects the outermost end and the axis of the body, the maximum distance between the first line and the second wall is set to range between 0.45D and 0.65D, wherein D is a diameter of the body.
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