A micro deep hole drilling tool with variable core thickness and variable groove width and its sharpening method

Abstract

The invention discloses a tiny deep hole drilling cutter with the variable core thickness and the variable groove width and a sharpening method of the cutter, and belongs to the technical field of machining. The cutter is structurally characterized in that the core thickness and the groove width of a spiral groove are simultaneously increased linearly from a drill point part to the tail part of the spiral groove. According to the drilling cutter, in the process of spiral groove sharpening, by controlling linear increasing of the relative distance of a grinding wheel axis and a drill bit axis, linear increasing of the core thickness is achieved; and by controlling linear increasing of the offset distance of a grinding wheel center and a drill bit center, linear increasing of the groove width of the spiral groove is achieved. According to the tiny deep hole drilling cutter with the variable core thickness and the variable groove width, for characteristics of tiny deep hole drilling and cutting machining of difficulty-machined materials, on the one hand, through the linear increasing of the core thickness from a drill point to the tail part of the spiral groove, the rigidity and the strength of the cutter are improved, and phenomena of bending and breaking-off of the cutter can be reduced; and on the other hand, through the linear increasing of the groove width of the spiral groove from the drill point to the tail part of the spiral groove, a scrap storing space of the cutter is enlarged, the scrap discharging capability of the cutter during tiny deep hole drilling and cutting is improved, phenomenon of torsional fracture of the cutter caused by scrap cutting blocking can be reduced, and the service life of the cutter is improved.

Description

technical field [0001] The invention relates to a micro deep hole drilling tool with variable core thickness and variable groove width and a sharpening method thereof, belonging to the technical field of mechanical processing. Background technique [0002] With the rapid development of science and technology and industrial production, the application of tiny deep holes is becoming more and more widespread, and there are more and more parts with tiny deep holes, such as instrument components of aerospace inertial gyroscopes, jets of aviation / automobile / ship engines. Grease nipples, film cooling holes in turbine engine blades, computer print heads, printed circuit boards, etc. These small deep-hole parts are mostly made of difficult-to-machine materials such as stainless steel, high-strength steel, and titanium alloys. For example, high-temperature and high-pressure parts and engine fuel injectors are often made of 1Cr18Ni9Ti stainless steel. Micro deep hole processing genera...

AI Technical Summary

Problems solved by technology

The rigidity and strength of the small deep hole drilling tool are relatively low, and it is easy to slip and deflect when drilling, and the bending deformation of the tool is easy to cause breakage and damage. Too large can easily cause tool breakage and failure

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