Ellipsoidal drill bit

Abstract

The invention provides an ellipsoidal drill bit, which comprises a handle part for clamping and transmitting power, and a drill bit work part, wherein the handle part comprises a drill stock and a drill neck; the drill neck is provided with a minor cutting edge and two or three spiral grooves; the drill bit work part is arranged on the end part of the drill neck, and comprises a drill tip; a main cutting edge and a chisel edge are arranged on the end face of the top end of the drill tip; the diameter from the drill tip to the handle part is gradually reduced so as to form a back taper shape; the main cutting edge is in an arc shape; the chisel edge is in an 'S' shape; arc-shaped edges are respectively formed on two sides of the chisel edge; a passing hollow is formed between the arc-shaped edges and the chisel edge. The ellipsoidal drill bit has the advantages of high efficiency, long service life and good drilling quality during the drilling process. The main cutting edge is arranged to be in the arc shape, a front angle of each point on the main cutting edge is changed to form a shape of small outside and large inside, and the length of the cutting edge is increased, so that the cutting load in the unit length is reduced, the heat radiation condition is improved, and the durability is improved by more than 10 times.

Description

technical field [0001] The invention relates to an ellipsoid drill bit. Background technique [0002] Twist drill is the most widely used hole processing tool. Usually the diameter ranges from 0.25 to 80 mm. It is mainly composed of the working part of the drill bit and the handle. There are two spiral grooves in the working part, which are shaped like twists, hence the name. In order to reduce the friction between the guide part and the hole wall when drilling, the twist drill gradually decreases in diameter from the drill tip to the shank, and is in the shape of an inverted cone. The helix angle of the twist drill mainly affects the size of the rake angle on the cutting edge, the strength of the blade blade and the chip removal performance, usually 25° to 32°. The spiral groove can be processed by milling, grinding, hot rolling or hot extrusion, and the front end of the drill bit is sharpened to form a cutting part. The front angle of the cutting part of the st...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a kind of ellipsoidal surface drill bit to solve the main cutting edge in the prior art. Due to the large friction, the cutting temperature rises during use, the wear of the outer corner of the drill bit is relatively large, and the roughness of the processed surface deteriorates, which affects the drill bit. Durability, shortening the service life of the drill bit and other issues

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