Composite twist drill

Abstract

The invention discloses a composite twist drill. The composite twist drill comprises a main cutting part, an auxiliary cutting part and a handle part, the auxiliary cutting part and the handle part are both hard alloy bodies, and the main cutting part is a polycrystalline diamond sheet; the auxiliary cutting part comprises two blade petals, and two spiral chip grooves are formed between the two blade petals; the front end faces of the two blade petals and the outer side face of the polycrystalline diamond sheet form a head conical face, two connecting faces are formed on the head conical face, and each connecting face comprises a main rear cutter face, an auxiliary rear cutter face and a notch end face; and each spiral chip groove and two intersecting lines between the end face of the corresponding first notch and the adjacent first main rear cutter face form a main cutting edge, and the two main cutting edges are connected through two drill tip transition arcs. The composite twist drill is high in abrasion resistance, capable of effectively preventing a drill tip from tipping, long in service life, capable of improving the quality of the machined surface and capable of being applied to drilling machining of metal and nonmetal composite materials which are high in abrasion resistance and difficult to machine, especially hard particle / fiber reinforced composite materials.

Description

technical field [0001] The invention relates to the technical field of metal or non-metal material removal processing in the machinery industry, in particular to a composite twist drill. Background technique [0002] Hard particle-reinforced metal matrix composites have been widely used as high-performance structural materials in aerospace, transportation vehicles, etc. due to their high specific strength, high specific stiffness, and excellent wear resistance, resistance to organic liquids, and solvents. The application of hard granular aluminum-based composite materials in traffic vehicles can significantly reduce the weight of vehicles and improve their friction resistance and prolong their service life. However, it is precisely because of the effect of the hard reinforcing phase of the composite material that its machinability becomes poor, and higher requirements are placed on the anti-adhesion, chipping resistance and wear resistance of the tool. The currently widely ...

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Problems solved by technology

[0003] (1) The tool is severely worn, and built-up edge is easy to form on both sides of the drill tip, or chipping occurs, and the service life of the drill bit is extremely short;

[0004] (2) The quality of the processed surface deteriorates and cannot meet the requirements;

[0005] (3) The wear resistance of the tool is obviously insufficient. For porous workpieces that require more than 12 holes, a single drilling tool sometimes cannot even complete the processing of a workpiece. The processing efficiency is low and the quality is unstable, which cannot meet the mass production requirements of the product.

[0006] For the drilling of hard particle-reinforced metal matrix composites, the failure during processing is mainly manifested as built-up edge and edge damage. Built-up edge and reinforcement phase are the factors that affect the surface roughness of hard particle-reinforced metal matrix composites. Built-up edge will promote the formation of scales during the cutting process, which will reduce the surface processing quality; the abnormal wear of the drill bit is chipping, edge chipping and sharpening

A lot of exploration and experiment work have been carried out at home and abroad, but there is still no relevant mature and standardized drill bit that can be selected and used to solve the above problems

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