通过数学分析将麻花钻前刃面端截面曲线归纳成广义渐开线；

With mathematic analysis the end section curve of front blade of twist drills is induced into generalized involute;

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通过数学分析将麻花钻前刃面端截面曲线归纳成广义渐开线；

With mathematic analysis the end section curve of front blade of twist drills is induced into generalized involute;

youdao