Drill structure

Abstract

The invention discloses a drill structure. A drilling edge part is spirally provided with two chip discharging channels, which are in a state of from being separated to being gradually combined from a drill tip end to a drill handle, or in an overlapping state from the drill tip end to the drill handle. The two chip discharging channels are respectively provided with a first depth and a second depth, and the depth change rate of the first depth from the drill tip end to the drill handle is different from that of the second depth. The drill structure has advantages of improving drilling hole performance.

Description

technical field [0001] The invention relates to a drill bit structure, especially a drill bit structure in which two overlapping or separated chip discharge grooves have different depth change rates from the drill tip to the drill shank. Background technique [0002] The development of high-density and high-precision line thinning of electronic circuits on printed circuit boards, the drilling process has used a large number of ultra-small-diameter drills, and under the market competition for high-quality, high-demand and fast-supply printed circuit boards, It is a common expectation and demand to require drills to achieve high precision, high feed rate, good hole wall quality, and processing conditions that do not break during operation; among them, in order to improve operating efficiency and reduce manufacturing costs, for printed circuit boards The through-hole drilling process uses multiple overlapping printed circuit boards for the through-hole drilling process, so a lo...

AI Technical Summary

Problems solved by technology

[0003] Most of the two cutting edges of the traditional drill bit are provided with a spiral chip discharge groove along the axial ring of the drill bit to discharge the waste chips cut by the blade along the chip discharge groove, such as figure 1 Shown is a partial cross-sectional schematic view of a traditional drill bit, as shown in the figure, the two chip discharge grooves 14, 14' formed on the surface of the drill edge portion 12 of the drill bit structure 10 are separated and symmetrically arranged. In this drill bit structure 10, Since the two chip discharge grooves 14, 14' are staggered and spirally surrounded, the width of the chip discharge grooves 14, 14' is limited, which affects the smoothness of chip removal, and causes chips to be blocked on the drill edge 12 during the drilling process. Scratches with the hole wall, affecting the quality of the hole wall

[0004] On the other hand, the two helical chip discharge grooves 14, 14' surrounding the drill portion 12 also cause the thickness of the core inside the drill portion 12 to be greatly reduced, thereby affecting the overall rigidity of the drill structure 10. When rotating at a high speed, the wear and damage of the drill part 12 is accelerated, causing the problem of needle breakage

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