Wear behavior of microgroove texture of cemented carbide tool prepared by laser surface texture

Abstract

In this paper, two types of textures, such as U-grooves and diamond pits, are designed according to the deformation of carp scales, earthworm surface, and shark shield scales. Four kinds of U-shaped and rhombic textures with different gradients were fabricated on the surface of cemented carbide YT15 by femtosecond laser processing technology. Combined with the dynamic pressure lubrication theory, the influence of unidirectional convergent gradient texture on the friction coefficient and wear volume of the worn surface was systematically studied. The lubrication mechanism of unidirectional convergent gradient texture on the cutting performance and surface tribological properties of the tool were explored. The influence of non-gradient texture and unidirectional convergent gradient texture on the friction performance was compared. The optimal texture shape and the design parameters were found. The effective physical quantities to judge the dynamic pressure lubrication effect were theoretically solved. The experimental results were demonstrated and a complete unidirectional convergent gradient texture research system was established. In the cutting experiment, two kinds of U-shaped texture and diamond texture were prepared on the surface of YT15 cemented carbide tool, and the cutting experiment of 45 # quenched and tempered steel with different tools was carried out on CDE6140 A ordinary horizontal lathe. The cutting force generated by each group of experiments was measured using the cuttingDC-IH89B piezoelectric dynamometer. The average friction coefficient was calculated by the theoretical formula of tool–chip contact. The microstructure of the worn tool was observed under the scanning electron microscope. Compared with the cutting wear of the ordinary unstructured tool, the tribological properties and the cutting performance of the textured tool were analyzed.