Drilling bit

Abstract

The invention provides a drilling bit which comprises a handle portion and a blade portion. The blade portion comprises a cuttings forming area, a cuttings discharging area and a grinding wheel retreating area which are sequentially connected, the grinding wheel retreating area is connected with the handle portion, and diameter of a drilling core gradually increases from one end, close to the handle portion, of the cuttings forming area to one end, away from the handle portion, of the cuttings forming area, gradually decreases from one end, close to the handle portion, of the cuttings discharging area to one end, away from the handle portion, of the cuttings discharging area and gradually decreases from one end, close to the handle portion, of the grinding wheel retreating area to one end, away from the handle portion, of the grinding wheel retreating area. The drilling bit is simple, reasonable and compact in structure, cutting performance of the drilling bit can be guaranteed while shape and length of sections of cuttings are effectively controlled to avoid cuttings blockage, and friction between the cuttings and the surface of a groove as well as the inner wall of a drilled hole is reduced, so that friction heat is reduced, and accuracy of the drilled hole and surface quality of the inner wall of the drilled hole are improved.

Description

technical field [0001] The invention relates to cutting tool technology, in particular to a drill bit. Background technique [0002] The drill bit is a cylindrical base body composed of a shank and a cutting edge, and the cutting edge has a groove, and the groove extends helically from the end face forming the drill point along the axis of the drill bit. At present, the main difficulty of drill drilling is how to effectively control the discharge of chips. First of all, with the increase of the drilling depth of the drill bit, it becomes more and more difficult to discharge chips, and chip blocking is prone to occur, affecting the drilling process of the drill bit, and even causing the bit to break in severe cases. During the drilling process, the chips are separated from the body of the material to be cut through shear slip by the main cutting edge of the drill tip, and curl along the surface of the groove to form a chip shape similar to a conical spiral. As the drilling ...

AI Technical Summary

Problems solved by technology

[0006] The object of the present invention is to propose a drill to effectively control the cross-sectional shape of chips while ensuring the cutting performance of the drill, aiming at the problems that the above-mentioned existing drill is not conducive to chip removal, resulting in short drill life, poor drilling efficiency and quality and length, to avoid chip blocking, reduce the friction between chips and the surface of the groove and the inner wall of the drilled hole, thereby reducing frictional heat, and improving the accuracy of the drilled hole and the surface quality of the inner wall

Images