Preparation and Antifriction Characteristics of Groove Texture on YG8 Cemented Carbide Surface

Groove textures were machined on the surface of YG8 cemented carbide by optical fiber laser processing equipment. The effect of laser processing parameters on the texture size and morphology was studied, and the optimum laser processing parameters were obtained. Four sinusoidal groove textures with different directions were machined on the surfaces of cemented carbide with the optimum laser processing parameters, and the antifriction characteristics of the texture under dry friction conditions were studied. The results show that with increasing laser power, increasing scanning time or decreasing scanming speed, the size of groove texture increased, but too high laser power or too many scanning times coarsened the texture bottom. The optimum laser processing parameters were laser power of 40 W, scanning speed of 100 mm·s^-1 and scanning times of 200; with these parametens, the groove texture had relatively good surface morphology with width of 160 μm and depth of 15 μm. At the load of 2 N and the sliding speed of 20 mm·s^-1, the antifriction effect of the sinusoidal groove texture with sinusoidal center line at 0° to the friction direction was better than those with sinusoidal center lines at 30°, 60° and 90° to the friction direction, and the friction coefficient was 25% lower than that of the smooth sample.