Ultra-long hard alloy deep hole twist drill for deep hole processing

Abstract

The invention discloses an ultra-long hard alloy deep hole twist drill for deep hole processing. The ultra-long hard alloy deep hole twist drill comprises a handle part and a blade part which are coaxially arranged, wherein two spiral chip grooves are formed along a central axis on the blade part, and the two chip grooves define a back part; a supporting surface is arranged on the upper surface ofthe blade part; the supporting surface guides for drilling; a U-shaped cooling slot is formed in the supporting surface, a vortex angle which is a cutting edge is arranged at the left side of the blade part, a transverse blade, a secondary blade and a primary blade are arranged on the cutting edge, a crossed part of the primary blade and the secondary blade is provided with a transition blade through circular-arc transition; and the secondary blade, the transition blade and the primary blade are sequentially connected to form continuous cutting edges which are symmetrically distributed with respect to a center cross line, and are connected through the transverse blade. According to the ultra-long hard alloy deep hole twist drill for deep hole processing disclosed by the invention, the supporting surface for a drill bit, spiral angles of the chip grooves, a slot shape, a core thickness, and a circular-arc transition shape of a cutting edge hole are designed in a targeted mode, so thatdrill bit rigidity, chip removal performance and edge hole strength are perfectly unified, and therefore, precision is improved by 100%, and the service life of a tool is prolonged by 8-20 times.

Description

technical field [0001] The invention belongs to the technical field of cutting tools, and in particular relates to an ultra-long hard alloy deep hole twist drill for deep hole processing. Background technique [0002] With the rapid development of the machinery industry, the quality and efficiency of mechanical parts processing are getting higher and higher. Traditional processing techniques such as high-speed steel drills, gun drills, and reaming drills have the following shortcomings: low processing efficiency, poor hole surface quality , the hole position is poor, and the life of the drill bit is short, which is far from meeting the current requirements. [0003] Take the crankshaft of automobile engine and the hydraulic valve block in construction machinery, which have a large amount of deep hole processing in the parts, as examples. The main material of these two types of parts is alloy steel, and the hardness of the processed material is high (HRC26~32), and the tensil...

AI Technical Summary

Problems solved by technology

[0002] With the rapid development of the machinery industry, the quality and efficiency of mechanical parts processing are getting higher and higher. Traditional processing techniques such as high-speed steel drills, gun drills, and reaming drills have the following shortcomings: low processing efficiency, poor hole surface quality , the position of the hole is poor, and the life of the drill bit is short, which is far from meeting the current requirements.

Due to the high precision of these two types of parts, the processing technology has been upgraded from traditional drilling machines to fully automatic CNC special machine tools. Fully automatic CNC special machine tools are basically imported and expensive. Without improving processing efficiency, manufacturing The cost has risen sharply, and the processing accuracy and efficiency of traditional high-speed steel drills cannot meet the requirements. Although the accuracy of gun drilling meets the requirements, the efficiency cannot meet the requirements.

Moreover, when manufacturing traditional high-speed steel drills and reaming drills, it is impossible to achieve central cooling, only external cooling, and the cooling efficiency is low

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