Simulation And Experimental Study On The Meso-scale Cutting Of Tungsten Carbide YG18

Tungsten carbide are widely used in mold industry because of its excellent properties.Due to its extremely difficult machinability,it mainly used grinding,EDM,ECM and other ways to machining at present,therefore,with the disadvantage of lower processing efficiency and higher processing cost has been unable to meet the needs of multi variety,small batch,personalized processing currently.For this reason,this paper carried out the meso-scale cutting process of the tungsten carbide YG18 as the main research object,through the combination of the orthogonal cutting experiments and two-dimensional finite element simulation to obtain the constitutive model parameters of the tungsten carbide material,then the three-dimensional finite element simulation of milling machining was carried out and the milling test was validated,finally,the cutting parameters were optimized and the machining test of tungsten carbide mold was carried out to the hope of providing a new way for the processing of the tungsten carbide mold.The main research work are summarized as follows:(1)On the basis of the orthogonal cutting experiments of tungsten carbide YG18,a 2D simulation model of cutting tungsten carbide YG18 was established in DEFORM software.By comparing the cutting force and chip morphology obtained by simulation and experimental,the parameters of the Johnson-Cook model and the Brozzo failure model of the tungsten carbide materials were obtained.(2)Based on the parameters of the material model obtained by the 2D cutting simulation,the 3D milling simulation model of the tungsten carbide YG18 was established to analyze the chip formation and chip morphology under different cutting parameters,and the trend of milling force under different cutting parameters was discussed.Finally,it provided a reference for the design of cutting parameters for milling experiments of tungsten carbide.(3)Based on the results of the 3D milling simulation,the milling experiments of tungsten carbide YG18 was carried out.The trend of milling force under different parameters was analyzed and compared with the milling force of three-dimensional simulation to verify the accuracy of the threedimensional simulation results.On this basis,the changing rule of milling force,surface roughness and tool wear state with cutting parameters were analyzed to select the best cutting parameters.Finally,the verification experiment of tungsten carbide mold was finished.