Discrete Element Simulation Research on Filling of Powder for Cemented Carbide Cutting Blades in Cavity
In the forming process of cemented carbide cutting blades,the quality of powder filling in the mold cavity will directly affect the quality of the molded parts.Realizing the dense filling of powder in the mold cavity is the key to improving the quality of powder metallurgy products.In this paper,the filling process of the mold cavity during the preparation of cemented carbide cutting blades was studied by the discrete element method(DEM),and ready-to-press(RTP)materials were used as the research object.The DEM models of RTP particles and the power distribution process were established.The powder distribution process was divided into two stages:blanking and particle filling.The packing density and particle segregation were taken as the evaluation indexes for the powder distribution quality inside the mold cavity.The influence of the physical properties of the powder,the geometric structure of the cavity,and the powder distribution technology on the powder distribution effect was analyzed.The results demonstrate that the particle distribution coefficient,the insertion ratio of the feed tube,and the translation speed of the filling shoe are pivotal factors influencing the packing density of the powder within the mold cavity.Specifically,when the particle distribution coefficient(n)is set to 0.5;the insertion ratio of the feed tube is 50%,and the translation speed of the filling shoe is 100 mm/s,an optimal particle packing density is achieved.By optimizing the key parameters derived from simulation results,the powder distribution effect is enhanced,offering guidance for practical production.
powder metallurgycemented carbide cutting bladesmold fillingdiscrete element simulation
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