---

Machining processes are the most important method to production in the industry. In these processes, the friction in tool-chip surface during the machining is one of the affecting factors on surface quality of work piece. The generated heat by friction, augment the tool wear mechanism and increase the wear rate of cutting edge which leads to reduction the surface quality. The high talent of aluminum to built-up edge formation during machining has the undesirable effect on the surface quality. In the present study in order to improvement the cooling-lubrication conditions in machining of 6061 aluminum alloy, a new cutting tool with creating micro-grooves on its rake face was developed to achieve the improving of cutting fluid transfer to machining zone and reducing the friction between tool-chip surface. Two types of micro-grooves have been created by laser machining process. Specimens by changing the machining parameters and types of the applying of cutting fluid to machining zone were machined. The experimental results obtained from surface roughness survey and prepared images of work piece surface by scanning electron microscope (SEM) and optical microscope showed that by creating the micro-grooves, the delivery conditions of cutting fluid to machining zone has improved and its effect to reduction of surface roughness is clearly visible. By comparison the results of two micro-grooves showed that direction of grooves is the most important parameters in its design, so that the perpendicular texture is not only improves the surface quality but also increase the surface roughness compared to non-texture tool.

---

Due to high ability of built-up edge formation during aluminum machining, this study aim to reducing adhesive wear and increasing surface integrity of 5052 aluminum alloy workpiece has been focused on creating different surface texture on tungsten carbide cutting tool. For this purpose, four types of micro-grooves such as parallel and perpendicular to cutting edge and also pit and cross mode have been created on rake face by laser machining process. In addition to the types of texture, three methods of cooling-lubrication condition include: dry machining, flood mode without pressure and flood mode with high-pressure along with various holder and cutting inserts (with chip-breaker and without chip-breaker) as well as three levels of cutting speed (fixed feed rate and depth of cut) were considered as process variables. The experimental results obtained from surface roughness survey of the machined parts along with prepared images of optical microscopy from the workpiece surface showed that the presence of parallel micro-grooves significantly improves the cooling-lubrication conditions of the tool-chip surface and its effect on numerical reduction of surface roughness value and reduction of density of defective regions on the workpiece surface is visible. The prepared images by scanning electron microscope (SEM) of the tool rake face showed that the presence of chip-breaker did not significantly effect on reduction of adhesion wear in the machining of aluminum alloy but micro-texture can be largely improved the adhesion wear area compared to non-textured tool (with chip-breaker or without chip-breaker).