Miniature four-blade drill bit and machining method thereof

Abstract

The invention relates to the technical field of drill bits, and discloses a miniature four-blade drill bit and a machining method thereof. The miniature four-blade drill bit comprises a drill rod. A drill end is formed at the bottom end of the drill rod, and a drill point is formed in the center of the drill end. Four chip containing grooves spirally formed in the axial direction of the drill rod are sequentially formed in the outer circumference of the drill rod at intervals. Four main cutting blades are formed on the lateral side of the drill end and sequentially surround the drill point. Four transverse blades are formed at the drill end, sequentially surround the drill point and are intersected at the drill point. As the four main cutting blades are formed on the lateral side of the drill end, when drilling is carried out through the drill bit, four supporting points are formed at the drill end, the balance of the drill bit is improved, and abrasion of the main cutting blades is reduced; the four chip containing grooves can increase chip discharging space, and the length of the transverse blades is sufficient, the core thickness can be increased accordingly, and the rigidity of the drill bit is greatly improved accordingly; in this way, in the drilling process of the drill bit, the drill bit breaking probability is greatly reduced.

Description

technical field [0001] The invention relates to the technical field of drill bits, in particular to a miniature four-edged drill bit and a processing method thereof. Background technique [0002] At present, the PCB board is a component widely used in electronic products. In the process of processing the PCB board, a drill is often required to drill the PCB board. [0003] refer to figure 1 and 2 As shown, in the prior art, the drill bit commonly used in PCB board drilling has two symmetrical cutting edges and two symmetrical chip pockets 11, and the drill bit of this structure has the following defects: [0004] 1) The rigidity is small; especially for small drills, because there are two symmetrical chip pockets 11, the thickness of the drill core becomes very thin, so the rigidity becomes smaller and the drill is prone to breakage; [0005] 2) The chisel edge is long; therefore, when the drill bit is drilling, the friction between the drill point and the PCB board is la...

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a miniature four-edged drill bit, which aims to solve the problem that in the prior art, the drill bit used for PCB board drilling has the defects of low rigidity, long chisel edge and easy wear, which leads to the problem that the drill bit is prone to breakage

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