High-precision drill bit

Abstract

The invention discloses a high-precision drill bit, comprising a tool body and cutting blades; the tool body is composed of a shank portion, a cutting end portion and a peripheral surface located between the shank portion and the cutting end portion; the cutting blades are located on the cutting end portion; a cooling channel penetrating from the shank portion to the cutting end portion is formed in the tool body; a chip pocket for removing chips is formed in the peripheral surface; shaft guiding bar groups are arranged at positions, corresponding to every cutting blades, on the peripheral surfaces; each shaft guiding bar group comprises at least two shaft guiding bars; every two adjacent shaft guiding bars in each shaft guiding bar group, the peripheral surface and a surface machined define a sealing region; at least one communicating hole is formed in each part, between every two adjacent shaft guiding bars in each shaft guiding bar group, of the peripheral surface; and each communicating hole communicates with the cooling channel. The high-precision drill bit has the characteristics of low circumferential stress on each shaft guiding bar, high precision and long service life.

Description

technical field [0001] The invention relates to a high-precision drill bit, in particular to a vibration-resistant high-precision drill bit with a plurality of guide bar structures for high-precision processing. Background technique [0002] When the high-precision drill bit is cutting, the cutting end is mainly subjected to cutting force, and the chips can only be discharged from the cutting end through the chip groove. Quickly discharged from the chip flute, the chip flute generally has a large chip space, so the ratio between the core thickness of the chip flutes on the peripheral surface of the high-precision drill bit and the diameter of the high-precision drill bit is small, and the changing deflection It is easy to cause the cutting end to vibrate following the low-strength peripheral surface. In order to reduce the vibration of the tool during the machining of the connecting hole, people set one or more shaft guide strips around the high-precision drill bit, and the ...

AI Technical Summary

Problems solved by technology

However, when the contact area between the shaft guide strip and the processing surface is too large, severe friction will occur between the shaft guide strip and the processing surface, which will greatly increase the cutting load and cause severe cutting vibration. However, if the shaft guide strip and the processing surface contact area are reduced, the shaft guide When the bar is designed to be narrow, it will reduce the guiding effect of the shaft guide bar and reduce the surface processing quality. At the same time, the narrow shaft guide bar is prone to chipping when cutting

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