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2. 发明公开

EP1666180A1 Drill 有权
标题翻译： Bohrer的
公开(公告)号：EP1666180A1
公开(公告)日：2006-06-07
申请号：EP05010337.3
申请日：2005-05-12
申请人： UNION TOOL CO.
发明人： Wakui, Hideo c/o Union Tool Co. , Takahashi, Shoichi c/o Union Tool Co. , Watanabe, Hidehito c/o Union Tool Co.
IPC分类号： B23B51/02
CPC分类号： B23B51/02 , B23B2251/201 , B23B2251/241 , B23B2251/282 , B23B2251/406 , H05K3/0047 , Y10T408/909 , Y10T408/9097
摘要： To provide a drill which has a small diameter but deteriorates neither in rigidity like the type having two cut blades and two chip discharging grooves nor in cutting chip discharging property like the type having one cut blade and one cutting chip discharge groove, and which is extremely excellent in practical use while performing the enhancement in hole position precision by a simple improvement, there is provided a drill in which a chisel edge 6 is provided at a tip end portion, a spiral first chip discharging groove 1 and a spiral second chip discharging groove 2 are provided, a land portion 3, 4 is provided between the first chip discharging groove 1 and the second chip discharging groove 2, and a cut blade 5 is provided at an edge of a rake surface 7 of the first chip discharging groove 1, characterized in that the first chip discharging groove 1 and the second chip discharging groove 2 are provided asymmetrically with respect to a drill rotational center O and a land portion 3 behind the first chip discharging groove 1 is larger than a land portion 4 behind the second chip discharging groove 2.
摘要翻译：为了提供一种具有小直径的钻头，既不具有如具有两个切割刀片和两个切屑排出槽的类型的刚性也不像具有一个切割刀片和一个切屑排屑槽的类型那样的切屑排出性能而变差通过简单的改进，在实现孔位精度的提高的同时，实用上是极好的，提供了一种钻头，其中在前端部设置有凿子边缘6，螺旋形第一切屑排出槽1和螺旋形第二切屑排出槽如图2所示，在第一排屑槽1和第二排屑槽2之间设置有陆部3,4，并且在第一排屑槽1的前刀面7的边缘设置切割刀片5，其特征在于，第一排屑槽1和第二排屑槽2相对于钻头旋转中心O非对称地设置，并且台肩部分3b 第一排屑槽1比第二排屑槽2后面的陆部4大。

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