This paper analyses that tip Angle of drill bit influences on cutting capability and life of twist drill, when the material and shape of work piece is different.
分析了工件材料、形状不同时，钻尖顶角的大小对麻花钻切削性能及寿命的影响，介绍了麻花钻的钻尖顶角的选择。
The model includes of important characteristics of drill bit and drilling operation, i. e. sectional geometrical property of drill, spiral Angle, speed and cutting force created during drilling.
该模型包括了钻头以及钻削操作的重要特性，即钻头的截面几何特征、螺旋角、转速和钻削过程中产生的切削力。
A set of calculating formulae for vertical milling teeth of drilling bit cones is derived herein from cutting rows with Angle cutters.
本文从尖角铣刀割圆出发，拟出了一套钻头牙轮直铣齿的计算公式。
A set of calculating formulae for vertical milling teeth of drilling bit cones is derived herein from cutting rows with Angle cutters.
本文从尖角铣刀割圆出发，拟出了一套钻头牙轮直铣齿的计算公式。
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