Drill

Abstract

The invention discloses a drill. The drill is formed by a drill handle, a drill body and a drill tip. The drill is characterized in that the drill tip is located at one end of the drill body, the drill tip and the drill body are of an integrated structure, the drill body is connected with the drill handle through an internal thread and an external thread, four semicircular strip-shaped grooves are formed in the periphery of the cylindrical drill handle, a fastening effect is achieved because of groove design, and the embedded drill handle can effectively prevent the drill from sliding off from an installing machine. The drill body is of a stepped conical structure, and the diameter of the drill body gradually decreases from the bottom end to the tip end. Thus, holes of different diameters can be drilled, the drill does not need to be replaced frequently, time is saved, and work efficiency is improved. Two symmetrical chip removal grooves are formed in the drill body of the stepped conical structure, so that accumulation of discharged chips is reduced in the chip removal process, and the problem that the drill cannot run normally is avoided. The drill tip is of a conical structure, so that the stress surface is reduced, drilling strength is enhanced, and hard objects are easily drilled through the drill tip.

Description

technical field [0001] The invention belongs to the field of drill bits, in particular to a stepped drill bit. Background technique [0002] A tool on a drill, drill press, or drilling machine that creates holes in a workpiece or rock. Xu Chi's "Goldbach's Conjecture Oil Head": "In 1956, the drilling materials in our country were a little tight, and the drill bits were not enough." During the work process, the drill bit rotates with the vertical shaft and moves axially at the same time. The soil is cut under the torque and axial force of the drill bit, and loosened under the extrusion and centrifugal force of the working blades, forming a soil flow that is pressed to the pit wall and lifted to the surface along the page. When the soil flow moves to the place where there is no pit wall, the broken soil is thrown around the pit due to the centrifugal force, and the digging process is completed. [0003] Most of the current drill bits use a round-end drill tip, which is prone...

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is that one drill bit cannot drill holes with different apertures, and the problem of drill bit breakage is prone to occur

Images