Point angles at outer corner and chisel edge corner are proposed to be used as the drill design parameters to determine the type uniquely and the relief Angle is used as a supplement parameter.
针对该钻型的特点，提出用钻尖主刃的外缘和横刃转点处的锋角作为其设计参数值。
Point angles at outer corner and chisel edge corner are proposed to be used as the drill design parameters to determine the type uniquely and the relief Angle is used as a supplement parameter.
针对该钻型的特点，提出用钻尖主刃的外缘和横刃转点处的锋角作为其设计参数值。
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