Active-type chip-breaking drill bit

Abstract

The invention provides an active-type chip-breaking drill bit, comprising a head part and a handle part. In the head part, a chip groove is arranged on the cylinder of a central axis; a back is the entity part for forming the chip groove; the chip groove and the intersecting line of the back in the axial direction form a main cutting edge; the chip groove and the intersecting line of the back in the radial direction form an auxiliary cutting edge; the main cutting edge and the auxiliary cutting edge are intersected to from a cutter tip; a chip-breaking groove is arranged in the chip groove and is parallel to the main cutting edge; and a chip dividing groove is arranged on the main cutting edge and is perpendicular to the main cutting edge. The chip-breaking groove parallel to the main cutting edge is arranged in the chip groove, and the chip-breaking groove enables the chippings to additionally deform to enable the chipping to be broken after being distorted in order to ensure the smooth discharging of the chipping; and the chip-breaking groove is arranged to cut the chipping into two to three sections along the diameter direction, thereby being more beneficial to discharging the chipping smoothly. The active-type chip-breaking drill bit is widely suitable for the drilling of the difficulty processed materials in aerospace, military industry weapons and other civilian fields.

Description

technical field [0001] The invention relates to a high-speed, ultra-hard precision cutting tool, in particular to a self-breaking chip drill for hole machining of high-toughness and high-strength materials (such as stainless steel, titanium alloy, nickel-based cobalt-based and other difficult-to-machine materials). Background technique [0002] At present, difficult-to-machine materials are widely used in many industries such as aviation manufacturing, military industry and weapons, and gas turbines. [0003] Compared with general steel, the cutting of difficult-to-machine materials is mainly reflected in the following aspects: 1) The tendency of work hardening is large. For example, the hardness of GH4169 unstrengthened matrix is ​​about HRC37, and the surface after cutting produces about 0.03 mm. In the hardened layer, the hardness increases to about HRC47, and the hardening degree is as high as 27%. The work hardening phenomenon has a great influence on the tool life, and...

AI Technical Summary

Problems solved by technology

The main difficulties in hole machining of difficult-to-machine materials are: 1) The cutting force is large, which consumes a lot of power of the machine tool; 2) Hole machining is a semi-closed cutting, which generates high cutting heat and chips that are difficult to break. It is difficult to discharge away from the tool tip in time, causing tool wear More severe; 3) In the hole machining of difficult-to-machine materials, the tool wear is much faster than that of ordinary steel, and tool materials with better cutting performance are required

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