Four-blade drill bit for forming elliptical hole

Abstract

The invention discloses a four-edged drill for making elliptical holes, which comprises a tip, a drill body, a casing, a pin opening, a cutting device, drill teeth, a drill handle, a connecting device and a fixing hole. The beneficial effects of the present invention are: the drill has a compact structure and is easy to use. The drill body is a four-edged drill, and blades are arranged in an array outside the cutting device, which can improve chip breaking effect. The tip is a cone structure, and the cutting device is an eccentric structure. It is used to make elliptical holes, and the drill teeth are equipped with chip grooves. When the drill bit is advanced, it prevents debris from clogging and makes the advancement more difficult. The surface of the drill body is coated with a metal layer, which has high smoothness and drilling accuracy. The connecting device There is a pin opening on one side, which can be fixed by pins. The inner side of the fixing hole is provided with threads, which can firmly install the drill bit on the drilling machine to prevent the drill bit from moving. There is a buckle inside the casing, and the drill teeth are installed on the drill handle. Inside the top, the drill teeth can rotate flexibly and have strong stability during work.

Description

technical field [0001] The invention relates to a four-edged drill bit, in particular to a four-edged drill bit used for making elliptical holes, and belongs to the field of drill bit equipment. Background technique [0002] Drills are used to drill through holes or blind holes on solid materials, and can ream existing holes. Commonly used drills mainly include twist drills, flat drills, center drills, deep hole drills and trepanning drills. Although reaming drills and countersinking drills cannot drill holes in solid materials, they are customarily classified as drill bits. When digging a hole, the drill bit rotates with the vertical shaft and moves axially at the same time. The soil is affected by the torque of the drill bit and It is cut under the action of axial force, and is broken under the extrusion of working blades and centrifugal force, forming a soil flow that is pressed to the pit wall, and at the same time lifted along the page to the surface. When the soil flow...

AI Technical Summary

Problems solved by technology

[0003] At present, there are some deficiencies in the four-edged drill bit. Some drill teeth are not provided with chip pockets. Blades and drills have low propulsion efficiency, insufficient sharpness, and poor practicability

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