Manufacturing process of polycrystalline diamond machining tool

Abstract

The invention discloses a manufacturing process of a polycrystalline diamond machining tool. The manufacturing process comprises the steps of aligning and fixing a polycrystalline diamond cutter headblank and a cutter handle blank by adopting a welding fixture, and then performing vacuum welding; forming 72 to 80 cutting edges which are annularly and uniformly distributed in one end, which is farfrom the cutter handle blank, of the polycrystalline diamond cutter head blank through laser cutting, and forming chip grooves between adjacent cutting edges, wherein the width of the cutting edges is 0.03 to 0.1 mm, the surface roughness Ra of each cutting edges is 0.1 to 0.4 mum, and the helical angle of each cutting edge is 45 to 65 degrees. The 72-to-80-edge polycrystalline diamond machiningtool prepared by adopting the manufacturing process has the advantages of good wear resistance, long service life, high workpiece machining efficiency and short machining time, and products which aremachined by adopting the polycrystalline diamond machining tool have the advantages of good dimensional stability, low detection frequency and low rejection rate.

Description

Technical field [0001] The invention relates to the technical field of tool processing, in particular to a manufacturing process of a polycrystalline diamond processing tool. 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 machining accuracy and machining 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, which is a regular tetrahedral structure in space. The carbon atoms of this structure The bonding force is extremely high, and the macroscopically shows extremely high hardness. [0003] Currently, diamond tools mainly include single crystal diamond (MCD) tools, polycrystalline d...

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Problems solved by technology

[0004] Compared with polycrystalline diamond tools and diamond-coated tools, diamond-coated tools have 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. The tool is prone to coating peeling during high-speed milling, resulting in coating failure

The traditional polycrystalline diamond tool is made by directly welding the polycrystalline diamond cutting edge to the cemented carbide blade or the cutter body, also called the welding piece pcd contour knife, but there are polycrystalline diamond processing with more complex shapes The problem that the cutting tool is difficult to process cannot meet the requirements of high precision and long life

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

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