变密度微织构自润滑刀具切削纯铁材料的试验研究

Friction at the tool-chip interface may be reduced by introducing a lubricant into the tool-chip interface, the effectiveness of which can be enhanced by surface texturing the tool. Micro-grooves with even density and micro-grooves with different even densities that high density at the area close to tool nose and low density at the area away from tool nose were fabricated employing laser on the rake face of carbide tools, with a view to facilitating lubricant penetrate and retention, then solid lubricant (molybdenum disulfide) was applied to fill micro-textures to form micro-textured self-lubricating tools (GT and VGT). Dry cutting experiments in machining pure iron were carried out with micro-texture self-lubricating tools and conventional turning tool on the numerical control lathe, and the cutting performances of them were compared. Results confirm that surface micro-texture can improve the friction between the tool and chip effectively under the condition of lubricant, meanwhile, it can also increase the tool adhesive wear resistance evidently. VGT tools show better cutting performance in comparison with GT tools.