Drill bit for processing deep hole with large length-diameter ratio

Abstract

The invention discloses a drill bit for processing a deep hole with a large length-diameter ratio. The drill bit comprises a drill bit body; the drill bit body comprises a drill tip part, a chip removal part and a handle part; the chip removal part is provided with a chip removal groove and a secondary cutting edge extending from the drill tip part to the handle part; the drill tip part is provided with a front tool face, a rear gap face and a transverse edge; the front tool face is crossed with the rear gap face to form a main cutting edge; the main cutting edge is formed by connecting a linear inner edge and a curved outer edge; the linear inner edge is connected with the transverse edge; the curved outer edge comprises an arc cutting edge, a linear cutting edge and an arc transition edge; the arc cutting edge and the arc transition edge are raised into the chip removal groove; the arc cutting edge is connected with the secondary cutting edge; and the arc transition edge is connected with the linear inner edge. The drill bit for processing the deep hole with the large length-diameter ratio has the advantages of simple structure, good durability, strong chip cutting and removal capabilities and high cutting efficiency.

Description

technical field [0001] The invention relates to metal cutting technology, in particular to a drill bit for deep hole processing with a large length-to-diameter ratio. Background technique [0002] There are many types of cutting tools for deep hole machining. At present, extra-long twist drills, gun drills, BTA drills and self-guided jet drills are commonly used. They have certain shortcomings in manufacturing and use, such as the difficulty of chip removal for extra-long twist drills. During the drilling process, after drilling 2 to 3 times the depth of the hole, it is necessary to frequently lift the tool to remove chips. The lubrication and cooling conditions of the cutting edge are poor, the cutting temperature is high, the service life of the drill bit is low, the rigidity of the drill bit is poor, and it is easy to cause self-excited vibration. Gun drills, BTA deep hole drills and self-guided jet drills require cemented carbide as the blade in manufacturing, and it is ...

AI Technical Summary

Problems solved by technology

Although the centering performance of the drill bit of this invention is better than that of the standard drill bit, its drill tip is not convenient for grinding, and the production is difficult and costly.

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