Preparation and Structural Optimization of Diamond-Coated Tools for CFRP Drilling
This paper addresses the problems of the short service life of traditional carbide-coated tools for carbon fiber composite(CFRP)drilling,defects such as burrs on the processed workpiece,and large fluctuations in hole machining roughness.The machining performance of diamond-coated tools with different coating structures and different edge structures was prepared and compared.The results show that when diamond-coated tools are used for drilling CFRP materials,the composite structure of microcrystalline diamond(MCD)/nano-crystalline diamond(NCD)has better abrasion resistance and longer service life than a single MCD-coated structure;the cutting edge structure can be optimized by decreasing the inverted cone of the drill bit and the angle of the tip and increasing the front angle of the slot,the front angle and width of the back of of the chip pocket at drill tip.The average roughness of the machined hole diameter of the diamond-coated tools with optimized cutting edge structures is significantly reduced,and the roughness extreme difference is reduced from 4.105µm to 0.848µm.
diamond-coated toolscomposite materialsdrilling and machining
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