Drill Structure

A drill bit comprises a knife rod (1), which has a tip with two cutting inserts (5, 5') located on a main plane (C-C), and the cutting insert (5, 5') has a short central cutting edge with orientation on the common second plane (E-E). The cutting edge forms a point-like central cutting edge for entering the workpiece, and thus the drill bit is in pairs. On the knife rod, two chip-draining grooves (6, 6') are arranged, and the chip-draining grooves (6, 6') extend from the tip to the end. On any cross-section along the bar, the chip-removal grooves are located in the radial opposite position of each other on the pipe plane, and the pipe plane extends by 90 degrees to the common edge band plane (F-F) of the two blades on both sides of the tube, and the bar has the greatest rigidity in that plane. The orientation of the second plane (E-E) of the center cutting edge is approximately 90 degrees at the main rigid direction (F-F) of the base of the blade plane or the bar.

A drilling bit that can be mitigated by a sudden change in drilling status, so that the drilling operation is stable, even when large particles of chips are produced, the drilling efficiency is not reduced.

Its roughly radiant configuration of the cutting edge, with at least 2 main cutting edge, and in the circular direction between the main cutting edge and the main cutting edge, at least two subcutting cutting edge, the main cutting edge has the main cutting edge as its cutting edge, the inner end of the main cutting edge is located in the center of rotation, the outer end is located in the outer edge of the rotation trajectory of the cutting edge.

The side cutting edge has a side cutting edge as its cutting edge, the inner end of the adhesion is located in the outer diameter side of the part away from the center of rotation, and the outer end is located in the position of the outer edge of the rotation trajectory that deviates from the cutting edge to the center of the rotation.

A drill bit with multiple cutting edge parts configured at the front of the drill bit, and an axis drill body with a handle on the base end side of the cutting edge and a handle on the base end;

The cutting edge has a cutting edge formed by the joint edge of the cutting face and the rear gap face to the front side, and the cutting edge is configured as approximately radiant from the outer diameter side of the center side of the drill bit rotation;

It uses the composite action of the rotation action and the action of the axis direction for impact cutting, which is characterized by the cutting edge having at least 2 main cutting edge parts, and the main cutting edge with the circumference between the main cutting edge and the main cutting edge in the direction of the circumference, at least 2 side cutting edge;

The main cutting edge has the main cutting edge as its cutting edge, the inner end of the main cutting edge is located in the center of the rotation, the outer end is located in the outer edge of the rotation trajectory at the cutting edge, the secondary cutting edge has a subcutting edge as its cutting edge, the inner end of the sub-cutting edge is located in the part of the deviation from the outer diameter of the outer edge of the cutting edge of the rotation trajectory.