Self-cooling technology for machined twist drill and machining method for machined twist drill

Abstract

The invention provides a self-cooling technology for a machined twist drill and a machining method of the machined twist drill, and mainly relates to a machined twist drill. The machined twist drill is characterized in that a spiral secondary cutting blade is arranged on each spiral strip; a spiral secondary cutting face is formed along the outer side of the spiral secondary cutting blade; a spiral cutting face is formed in the front of the spiral secondary cutting blade in the cutting direction; the surface at the top of the front end of the spiral cutting face of the spiral strip at the front end in the axial center of the cutter head is a rear cutting face; the spiral cutting face is intersected with the rear cutting face to form a cutting blade; the included angle between the cutting blade and the spiral secondary cutting blade is set to be a flat blade, an arc-shaped blade or an inclined blade; a notch blade or a trapezoidal blade is arranged on the inner side of the flat blade, the arc-shaped blade or the inclined blade; a drill point or a stepped drill point is convexly arranged in the center of the cutting blade; the surface of the back side opposite to the spiral cutting face in the rotation direction of the machined twist drill is a rear spiral face; at least one spiral groove is formed in a rear spiral face, or spiral platforms are machined on the two sides of the spiral groove, or a water pipe is arranged in the spiral groove, or spiral sealing faces are arranged or welded on the spiral platforms, the shank portion of the top end of the spiral groove or the shank portion of the top end of the spiral platforms is provided with a cooling hole communicated with the spiral groove or the water pipe, and the top end of the shank portion or the shank is provided with a connecting port communicated with the outside.

Description

Technical field: [0001] The invention relates to a self-cooling technology and a processing method of a machine-added twist drill, which are used in drilling machine processing and fitter maintenance. Background technique: [0002] At present, the twist drill used in mechanical processing is composed of chisel edge, cutting edge, helical minor cutting edge, and side edge. The cutting edge and helical minor cutting edge are roughly in a single structure, with poor centering structure and protruding to the outside of the helical surface. Parts are easy to break, these twist drills are extremely undurable, especially when drilling and milling workpieces with high hardness, a large amount of heat is generated, resulting in a decrease in the hardness of the cutter head, resulting in wear of the cutter head, and the cooling technology becomes the bottleneck of the tool use , It is difficult to inject the coolant directly into the cutting place with ordinary technology, and the ide...

AI Technical Summary

Problems solved by technology

[0002] At present, the twist drill used in mechanical processing is composed of chisel edge, cutting edge, helical minor cutting edge, and side edge. The cutting edge and helical minor cutting edge are roughly in a single structure, with poor centering structure and protruding to the outside of the helical surface. Parts are easy to break, these twist drills are extremely undurable, especially when drilling and milling workpieces with high hardness, a large amount of heat is generated, resulting in a decrease in the hardness of the cutter head, resulting in wear of the cutter head, and the cooling technology becomes the bottleneck of the tool use , it is difficult to inject the coolant directly into the cutting place with ordinary technology, and the ideal cooling effect cannot be achieved.

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