High strength and high durability drill bit

Abstract

A high-strength highly-durable drill bit comprises a long and narrow component with a longitudinal axis, a shank capable of being mounted to a rotary machine and a cutting end. The cutting end at least comprises a first cutting edge and a second cutting edge which are symmetrically arranged on two opposite sides of the axis. Each cutting edge comprises a straight chisel edge portion with one end intersected with the axis and an arc cutting connection portion smoothly connected with a main cutting portion and the chisel edge portion. The at least two straight chisel edge portions and two arc connection portion edges are formed on the drill bit, so that centering of the drill bit is enhanced remarkably, chip breaking capability is enhanced remarkably, cutting resistance is lowered, the chisel edge portions are protected, and durability is improved significantly.

Description

technical field [0001] The invention relates to a cutting tool for hole processing, in particular to a drill bit, which is suitable for hole processing of various materials and has durability. Background technique [0002] A drill bit is a general term for a class of tools used to drill through holes or blind holes in solid materials and to ream existing holes. Its conventional types such as: twist drill, flat drill, deep hole drill, reaming drill and center drill, etc. [0003] Ordinary twist drills commonly used at present usually do not use chisel edge grinding. During the cutting process of the drill bit, especially when cutting high-hardness materials, the chisel edge without grinding is too long, so that the durability of the tool is low, and the precision of the processed holes is poor, resulting in a large number of scrapped or unqualified workpieces. [0004] In order to improve the heat dissipation at the tip of the drill bit and reduce the overheating damage of ...

AI Technical Summary

Problems solved by technology

But there are still some deficiencies, such as: the processing technology is complicated, and the arcs on the two cutting edges must be processed by high-performance CNC grinding machines to make the arcs on the two cutting edges accurately tangent to the drill tip. Most of these equipment are imported and expensive; The centering performance is poor, and the centering ability of the arc-shaped drill point is far worse than that of ordinary simple chisel edge grinding; the chip breaking performance is not good, although the arc-shaped drill point protects the chisel edge of the drill point, it also makes the drilling The chips in the chip cannot be fully extended and deformed, so that the chip cannot be broken at all. In actual processing, due to the entanglement of long chips, the drill bit is often broken and scrapped after only a few times of processing; Self-regrinding must be sent back to the tool manufacturer, and the cost of repeated use is high

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