Novel hard alloy inner-cooling deep hole twist drill

Abstract

The invention discloses a novel hard alloy inner-cooling deep hole twist drill. The novel hard alloy inner-cooling deep hole twist drill comprises a cylindrical handle part and a cutter body arranged on the cylindrical handle part, the cutter body comprises a cutting edge part and a transition neck part connected with the cylindrical handle part and the cutting edge part, chip grooves are formed in the cutting edge part, and the cutting edge part adopts the front inverted cone and rear parallel core thickness design. The chip grooves intersect with the solid part of the cutter body to form two auxiliary cutting edges and two edge flaps, the cutting edge part is provided with two rear cutter faces and two chip containing grooves, the two rear cutter faces intersect to form a chisel edge, the two rear cutter faces intersect with the two chip grooves to form two main cutting edges, the two rear cutter faces intersect with the two chip containing grooves to form two inner cutting edges, and the cutting rake angles of the main cutting edges and the inner cutting edges are different. According to the novel hard alloy inner-cooling deep hole twist drill, the problems that the deep hole machining cutting temperature is high, chip removal is not smooth, the cutter rigidity is poor, vibration deflection is prone to happening during drilling, consequently, the cutter is worn, the cutting edge is broken, and a drill rod is broken are solved.

Description

technical field [0001] The invention belongs to the technical field of deep hole twist drills, and in particular relates to a novel cemented carbide internal cooling deep hole twist drill. Background technique [0002] In metal cutting processing, the hole drilling process accounts for about 40% to 50% of the total cutting processing, especially in the aerospace and automobile manufacturing industries, and the production of drill bits accounts for about 60% of the total output of cutting tools. . Among them, the twist drill is one of the most common hole drilling tools, and it is also one of the tools with the largest loss in mechanical cutting, while the deep hole twist drill is used for the ratio of drilling depth to drilling diameter not less than 12 deep hole processing. [0003] Hole drilling is a processing method in a semi-closed state. Due to its semi-closed nature, the friction between the tool and the workpiece is large and the cutting temperature is high during ...

AI Technical Summary

Problems solved by technology

Compared with ordinary twist drilling, deep hole machining has a deeper cutting hole and a longer chip removal distance. When the coolant pressure is insufficient, the chips cannot quickly take away the heat generated during the cutting process, resulting in the cutting edge of the drill bit due to high temperature. It will cause plastic deformation and wear, and it is also prone to chip blocking, resulting in chip blocking or drill chipping, and even the phenomenon that the drill bit is broken due to too much torque.

[0004] In addition, due to the large overhang of the deep-hole twist drill and the poor rigidity of the process system, vibrations are easily generated during the drilling process, resulting in poor cutting positioning accuracy and easy deflection of the drill hole. In severe cases, the drill bit may even break and affect Machining accuracy and production efficiency

Therefore, it is necessary to design a new type of cemented carbide internal cooling deep hole twist drill to solve the problem of high cutting temperature, poor chip removal, poor tool rigidity, easy vibration and deflection during drilling, resulting in tool wear, cutting edge chipping, etc. Drill pipe breakage and other problems

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