Quick change chip removing drill bit

Abstract

The invention provides a quick change chip removing drill bit. The quick change chip removing drill bit comprises a drill handle and a cutter body coaxial with the drill handle. A spiral groove is formed in the cutter body, a drill point is arranged at the top end of the cutter body, and two rear cutter faces in central symmetry are arranged on the drill point. Each rear cutter face comprises a stepped first cutter face, a stepped second cutter face, and a third cutter face formed by coping towards the second cutter face along a back ridge of a drill bit, a spiral chip guide cambered face is arranged in the spiral groove along a tail ridge of the drill bit, rear ditch ridges of the first cutter face, the second cutter face and the third cutter face and the tail ridge of the top of the cutter body are simultaneously coped in the chisel edge direction, a first coping face and a second coping face are formed on the front face of the cutter body, an annular groove is formed in the drill handle along the outer peripheral face, and multiple hemispherical blind holes are formed in the drill handle.

Description

technical field [0001] The invention belongs to the technical field of tools, and in particular relates to a twist drill, especially a quick-change chip-cutting drill. Background technique [0002] With the continuous development of science and technology, new materials are constantly emerging, and new requirements are constantly put forward for drill bits. Especially when drilling difficult-to-machine materials, because the main edge of the traditional twist drill is long and the cutting width is wide, the chips are curled into spiral coils, which occupies a large space, resulting in poor chip removal and difficult flow of cutting fluid. The cutting heat at the cutting edge of the twist drill tip rises sharply, and the cutting edge is in a semi-closed state during drilling. Due to the limitation of the drill groove space, the chips cannot be discharged smoothly in time, which is easy to cause chip blocking and entanglement, resulting in The hardness of the cutting edge dec...

AI Technical Summary

Problems solved by technology

Especially when drilling difficult-to-machine materials, because the main edge of the traditional twist drill is long and the cutting width is wide, the chips are curled into spiral coils, which occupies a large space, resulting in poor chip removal and difficult flow of cutting fluid. The cutting heat at the cutting edge of the twist drill tip rises sharply, and the cutting edge is in a semi-closed state during drilling. Due to the limitation of the drill groove space, the chips cannot be discharged smoothly in time, which is easy to cause chip blocking and entanglement, resulting in The hardness of the cutting edge decreases rapidly, the wear increases, and the cutting ability is lost. In severe cases, the drill bit can be twisted, and it is easy to pile up and jam in the drilling hole. The increase of drilling force will aggravate the wear of the drill bit, and even cause the bit to be broken or burned, reducing the service life of the drill bit. Affect processing efficiency and processing quality

[0003] During the processing of drilling tools, the type of the drill bit will be constantly replaced according to the needs. The current quick-change drill bit includes a drill shank, a drill rod, and a cutter head. The drill shank is provided with an annular groove. It also provides a certain axial limit and circumferential limit, but the axial limit and circumferential limit are still not very reliable, and the structure of the quick-change drill itself is relatively simple, and major changes cannot be made

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