Machining tool of polycrystalline diamond tool bit

Abstract

The invention discloses a machining tool of a polycrystalline diamond tool bit. The machining tool comprises a tool bit and a tool handle which is connected to the tool bit, and the tool bit comprisesa base layer and a polycrystalline diamond cutting layer covering the base layer; the polycrystalline diamond cutting layer comprises a cutting main body and 32-36 cutting edges, wherein the cuttingedges are annularly and uniformly distributed on the cutting main body, and the adjacent cutting edges form chip removal grooves; and the tool bit and the tool handle are cylinders. According to theinvention, the polycrystalline diamond layer comprises the cutting main body and the 32-36 cutting edges which are annularly and uniformly distributed on the cutting main body, the adjacent cutting edges form the chip removal grooves, so that the requirement for machining the polycrystalline diamond machining tool with a multi-cutting-edges and a complex shape in a machining process is met; due tothe fact that the cutting edge and the cutting main body are both polycrystalline diamond, the cutting edge does not need to be adhered to the cutting main body, so that the polycrystalline diamond machining tool is good in abrasive resistance and long in service life and is higher in workpiece machining efficiency for machining a workpiece.

Description

technical field [0001] The invention relates to the technical field of cutting tools, in particular to a cutting tool for processing polycrystalline diamond cutting heads. Background technique [0002] Diamond tools have the characteristics of extremely high hardness and wear resistance, high thermal conductivity, low thermal expansion coefficient, low friction coefficient, and low affinity with non-ferrous metals, which enable them to obtain high processing accuracy and processing efficiency in high-speed cutting. The processing characteristics of diamond tools are determined by the crystal structure of diamond. In diamond crystals, each carbon atom forms a covalent bond with four adjacent carbon atoms, and has a regular tetrahedral structure in space. The carbon atoms of this structure The binding force between them is extremely high, and it shows extremely high hardness on the macroscopic scale. [0003] At present, diamond tools mainly include monocrystalline diamond (M...

AI Technical Summary

Problems solved by technology

[0004] Compared with polycrystalline diamond tools and diamond-coated tools, the latter has problems such as weak bonding between the diamond coating and the cemented carbide substrate, and a large difference in thermal expansion coefficient between the coating and the substrate, resulting in internal stress. Coating peeling is prone to occur during milling, leading to coating failure

[0005] However, due to the addition of binders, the existing polycrystalline diamond tools have lower hardness and wear resistance than diamond-coated tools, but they do not have the serious bonding force problem of diamond-coated tools, but there are more blades. Polycrystalline diamond machining tools with complex shapes are difficult to process, and cannot meet the requirements of high precision and long life

At present, there are few reports on polycrystalline diamond processing tools with complex shapes with a large number of blades (the number of blades is greater than or equal to 10)

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