The Study On The Preparation And Cutting Performance Of DLC Cutting Tool

With the development of precision cutting processing industry since the new century,more and cutting performance and machining precision and machining reliability requirements on cutting tools is higher, while the traditional tools are often unable to meet the higher requirements. In this paper, Cr doped diamond-like carbon composite films were prepared by using physical vapor deposition (PVD) cathodic arc ion plating technology on cemented carbide cutters with diameter of 6mm. The mechanical properties of DLC coatings were investigated by measuring the film bonding force,microhardness and thickness of the coatings. The use of coated tools and cutting tools are high-speed dry milling of 2A50 Aluminum Alloy and AZ91D magnesium alloy, change experiment using YDCB- Ⅲ 05 dynamometer measuring milling force, wear on the surface quality of the workpiece, chip morphology and cutting tool after the experiment. The simulation processing of DLC coated cutting tools Aluminum Alloy different thickness by the 3D simulation software Deform-3D,observe the trend with the coating thickness of the cutting force and cutting heat, analysis of the effect of thickness on the cutting performance of coated tools. The main conclusions of this study are as follows:(1) Using ICS-04 ARC PRO coating equipment, Cr doped diamond composite films were prepared on the surface of cemented carbide by cathodic arc ion plating technology. The experimental results show that the film bonding strength of Cr doped DLC films reaches the standard HF-1 grade, the thickness of the films is 2um, and the hardness of the films is HV3000.(2) The use of diamond coated cemented carbide tool and coated carbide tools were of high speed dry cutting of 2A50 Aluminum Alloy and AZ91D magnesium alloy, the experimental results show that DLC coating can effectively reduce the cutting force in cutting process, improve the surface quality of the workpiece, the cutting tool life is prolonged more than 2 times.(3) Simulation results show that the cutting force and cutting temperature followed the same variation in coating thickness increases from lum to 3um, cutting force and cutting temperature decreases with the increase of the thickness of the cutting tool life, also increased;in the coating thickness increases from 3um to 6um, cutting force and cutting temperature increases with the thickness of the coating, cutting down life.