研究了锥面麻花钻后刀面的成型，建立了钻尖的数学模型，由此确定了后角的计算公式。
The forming of flank of conical twist drill was studied and mathematical model of twist drill tine was founded in order to get formula of back clearance.
研究了锥面麻花钻后刀面的成型，建立了钻尖的数学模型，由此确定了后角的计算公式。
The forming of flank of conical twist drill was studied and mathematical model of twist drill tine was founded in order to get formula of back clearance.
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