FEA Of Metal Cutting Process Based On Ti(C, N)-based Cermets Cutter

Machining of metals is a major processing technique. As the increasing demands of precision equipments in electronic, optical and biological field, the dimension of the product becomes smaller; As a result, the quality requirements of cutting product becomes higher. Consequently, it is significant for either traditional or advanced machining technique to study cutting process, master the law of machining and to optimize the cutting process.Firstly, the Ti(C,N)-based cermet cutters were prepared through liquid-phase sintering method; The material performance were measured and calculated. Secondly, based on rigid-plastic finite element method, machining finite element models of different rake angles were built, and the cutting process of Ti(C,N)-based cermet cutters were simulated; the reasons of tool wear were analyzed through main cutting force, distribution of cutting temperature as well as stress condition. Lastly, machining tests of Ti(C,N)-based cermet cutters were implemented; the tool wear curves of different rake angles were obtained.Some important conclusions from the study are drawn as follows: Firstly, with the increasing of rake angle, main cutting force, cutting temperature and also equivalent stress on tools are falling down. Secondly, at the early stage of metal cutting, the wear area on tool is increasing rapidly, then slowing down; and the wear performance ofγ=10°cutter is the best of all. Generalized from all the factors above, the optimum rake angle of Ti(C,N)-based cermet cutters can be inferred when machining AISI1045 steel. Thirdly, the chip curling radius is related with the workpiece material: workpiece of better plasticity will turn up bigger curling radius of chip, so the chip will break more easily. The results of simulation and machining test are of well coincident, which proves the validity of the numerical simulation.The consequence of the issue indicates that the FEM of metal cutting could not only predict the main physical elements in cutting process, but also provide a feasible method for both the study of metal cutting theory and the development-research of new style cutter; Furthermore, it is very significant to study metal cutting more effectively.