Compared with the flat flank, conical flank, cylindrical flank and other drills, Auger Drill Bit drill is a new type of drill. Due to the limitation of the structure, the chisel edge of the flat, conical, cylindrical and other drill bits is actually subjected to the extrusion grinding process, so the chisel edge is It is easy to wear, and the axial penetration force is large when cutting; in addition, the centering ability of the drill is greatly enhanced.
A twist drill with a helical cutting flank includes a cutting part that rotates around the axis and a shank part that matches the jacket. The groove, the cutting part is also provided with a blade back respectively connecting the outer peripheral edges of the two grooves, and it is characterized in that: the groove and the blade back form two spiral cutting flanks at the front end of the cutting part, and the two The flank faces intersect with each other at the drill core to form an S-shaped core cutting edge and two main cutting edges. The main cutting edge is smoothly connected with the S-shaped core cutting edge through the cutting edge connecting part; the cutting flank starts from The main cutting edge is formed by the smooth connection of the main flank face, the transition face and the end face of the cutting flank. In the invention, the helical cutting flank intersects to form a smooth connection between the S-shaped drill core cutting edge and the main cutting edge, which greatly reduces stress concentration, further improves drilling feed rate and centering ability, and is easy to be widely popularized.
