Miniature drill bit

Abstract

The invention is applicable to the technical field of drill bit structures, and discloses a miniature drill bit. The miniature drill bit comprises a drillstock and a drill body arranged at one end ofthe drillstock, the drill body comprises a cutting part and a guide part, the guide part is arranged between the cutting part and the drillstock, the cutting part comprises two main cutting edges andspiral grooves corresponding to the two main cutting edges, the two main cutting edges are arranged on the end surface of the cutting part, the two spiral grooves spirally extend from the end surfaceof the cutting part to the direction of the guide part and intersect and stop at the front end of the guide part, a main chip removal groove and an auxiliary chip removal groove which extend spirallyfrom the front end of the guide part to the direction of the drillstock are formed in the guide part in parallel, and the front ends of the main chip removal groove and the auxiliary chip removal groove communicate with the intersection of the two spiral grooves. The miniature drill bit has the advantages that the overall rigidity of the drill bit can be improved, the problem that a cutting edge is broken in the drilling process of a PCB can be effectively solved, and the size precision of a machined hole site can be improved.

Description

technical field [0001] The invention belongs to the technical field of drill bits, in particular to a micro drill. Background technique [0002] With the requirements of halogen-free environmental protection for PCB boards, processing is becoming more and more difficult. The anti-breakage performance and hole position requirements of extremely small drills below Φ≤0.20 are getting higher and higher. [0003] At present, in the anti-breakage performance of extremely small drills, single-fluted drills have obvious advantages over conventional double-edged ordinary drills. However, the improvement of the single-groove drill is limited to adjusting the helix angle and core thickness taper to balance the rigidity and dust removal performance of the drill; so for small drills for PCBs below Φ≤0.20, the dust removal performance can be improved without reducing the drill. The rigid structure is very meaningful for the design of small drills below Φ≤0.20. Contents of the inventio...

AI Technical Summary

Problems solved by technology

However, the improvement of the single-groove drill is limited to adjusting the helix angle and core thickness taper to balance the rigidity and dust removal performance of the drill; so for small drills for PCBs below Φ≤0.20, the dust removal performance can be improved without reducing the drill. The rigid structure is very meaningful for the design of small drills below Φ≤0.20

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