Papers by Keyword: Coated Tools

Abstract: This study reports an experimental investigation about the wear behavior of TiN and TiCN coated carbide tools during the face milling of pearlitic and ferritic ductile cast iron. Pearlitic ductile cast iron caused the highest cutting forces and flank wear in both TiN and TiCN coated tools. Due to its protective effect, the TiCN coated carbide tool outperformed the TiN coated carbide tool regarding flank wear. The main issue when face milling ferritic ductile cast iron with TiN coated tools was notching wear. The principal reason for notch wear was pointed as adhesive wear caused for the high tendency of ferrite to adhere on the tool. The results demonstrated that the TiCN coating did not showed notching wear when face milling ferritic ductile cast iron, therefore a good choice of coating material can prevent notching wear.

Abstract: Cutting tool temperature which mainly depended on the tool-chip interface temperature has crucial effect on the tool service performance and its life. It is essential to investigate the heat conduction in the cutting tool in order to define the temperature distribution on the cutting tool during machining. Advanced coating materials are adopted to deposit on the carbide substrate to enhance the tools’ cutting performance. Thus, the influence of coating layers on the heat transfer during the cutting process has been an important research topic. Advantage software was employed to simulate the cutting process in this paper. The influences of coating materials on the temperature distribution in the cutting tools were investigated. The study results show that KCU10 cutting tool with TiAlN/TiN coating layers shows good thermal properties than that of KT315 cutting tool with TiN/TiC/TiN coating layers. The cutting temperature along the tool-chip contact length shows increasing trend first with the distance from the tool tip point and then decreasing after the tool-chip separation point. Under the same coating thickness, TiAlN coating material presents better thermal properties than TiN coating material.

Abstract: The research focused on the finite element simulation of the surface residual stress and took an experiment to get cutting temperature and cutting force by changing different groove and coated tools. Then it analyzed the influence of cutting and tool parameters on cutting force and temperature. Finally, the results reached a conclusion about the way that the tools with different groove and coating influenced the residual stress. The coated tools reduced the residual tensile stress in the machined surface. The axial and tangential residual stress was tensile stress and the tangential residual stress was larger than the axial in machining.

Abstract: Metal cutting processing is the most fundamental, most widely and the most important processing in industrial production. Because the development of mechanical manufacturing level plays a very important role in the coating technology material machining process. A coated carbide cutting tool with its high hardness and high wear resistance, good chemical stability and extensive compatibility characteristics, is widely applied in the metal cutting processing field. The author mainly studies the cutting force contrast between coated carbide cutting tools and not coated ones. Cutting tests have testified that if PVD technology applied on cutting, the cutting force of hard alloy cutter will alter with the change of feeds (f), depth of cutting (ap) and cutting velocity (v). The experiment suggests that the size of three-way cutting force of either the brand ZP25 hard alloy cutter or the carbide cutter by employing matrix ZP25 hard alloy cutter to respectively using PVD technology coat TiN or TiCN coating is successively FZP25>FTiCN>FTiN. The main reason for this is that the difference of frictional factor of the three kinds of cutter material and the workpiece material.

Abstract: A coated carbide cutting tool with its high hardness and high wear resistance, good chemical stability and extensive compatibility characteristics, is widely applied in the metal cutting processing field. It is one of the cutting tools, belonging to the current focus research and development project of all countries in the world. The author mainly studies the cutting force contrast between coated carbide cutting tools and not coated ones. At the same time study them on the rake face friction coefficient contrast and the chip deformation coefficient contrast so as to explain the reasons for coated cutting tool cutting force decrease. The research indicates that, in machining course, applying physical vapor deposition coated technology (PVD) of carbide cutting tools cutting force change with feeds, cutting depth and speed is the same as not coated carbide cutting tools. But coated carbide cutting tools cutting force is obviously less than that of not coated carbide cutting tools. The main reason is that the friction coefficient between the two kinds of cutting tool materials and the workpiece is different. The result of study will help popularization and application of coated carbide cutting tools.

Abstract: In the present study, an experimental investigation has been carried out in an attempt to monitor tool wear progress in turning Inconel 718 with coated carbide inserts under the wet cutting condition. First, each experimental test was conducted with a new cutting edge and the turning process was stopped at a certain interval of time. Secondly, the indexable insert was removed from the tool holder and the flank wear of the insert was measured using a three-dimensional digital microscopy (VHX-600E); and then the insert was clamped into the tool holder for the next turning experiment. The final failure of tool wear surfaces were examined under a scanning electron microscope (SEM) equipped with an energy dispersive X-ray spectrometer (EDS). It is indicated that significant flank wear was the predominant failure mode, and the abrasive, adhesive and oxidation wear were the most dominant wear mechanisms which directly control the deterioration and final failure of the cutting tools.

Abstract: The study is about an experimental investigation of the different factors influencing the temperature occurring at the coating/substrate and chip interface when machining Assab steels 760 and DF2 with two different coated carbide tools. Results show that tool temperature was higher when turning Assab steel 760. Temperature along the major flank face was higher that that at the minor flank. However, the magnitude of temperature was lower than expected with maximum only around 260 oC near the tool tip. The performance of Al2O3 coated WC inserts appeared to be better compared to TiN coated WC inserts. The cutting temperature was lower with alumina coated tools. While turning Assab DF2 steel, cutting temperature was lower compared to Assab 760 steel for the same coated tool.