Two screw locking crown drill bits in V -arrangement location

The utility model relates to a two screw locking crown drill bits in V -arrangement location, stifled including drilling rod, crown blade, housing screw and spiral shell, the drilling rod contains work portion, neck and stalk portion, and work portion is equipped with spiral chip groove, and the back of a knife blade is equipped with the cooling hole along the axial, the stalk portion is the cylinder form, is equipped with single direct -cooled but hole along the axial, the neck is equipped with the through hole that feeds through the cooling hole of the work portion back of a knife blade and the list of stalk portion direct -cooled but hole mutually, is equipped with the radial screw hole that feeds through mutually with it on the through hole, and it is stifled that radial screw hole department is furnished with the spiral shell, the terminal surface of drilling rod work portion is equipped with the V - constant head tank that is used for to hat tooth blade location, and V - constant head tank both sides are equipped with and are used for joining in marriage soon the fastening screw of housing screw, and the crown blade passes through the housing screw and fastens in the V - constant head tank. Spiral inner -cooling structure, the on the premise of that does not reduce drilling rod intensity reduces brill wand core favors, helps increasing the chip removal space, V -arrangement location structure contact surface is big, and positioning accuracy is high, crown blade recess is convenient for, and the convenience clamps in follow -up technologies such as surface coating.