Research On Powder Metallurgy Powder Loading Process Based On EDEM

The researches in the past ten years shows that powder filling process affect the ultimate quality of powder metallurgy products greatly, the purpose of filling is to deliver the powder into the die cavity in a reasonable way of distribution. This distribution is related to the interaction of powder and physical characteristics, such as the shape of parts, powder to powder and the boots movement between the mold. Therefore, in order to achieve nearly uniform density of powder metallurgy products we have to study of these factors deeply. Discrete element method in numerical simulation of powder metallurgy powder filling process in particles particle tracking and spatial analysis, the velocity distribution of the particles of the powder at any time, mass distribution and stress etc., powder metallurgy parts structure parameters optimization and powder process parameters optimization provide reference data and for preparation high performance powder metallurgy parts to provide theoretical and technical guidance, on a subsequent powder pressing part quality improvement is of great significance.With the use of edem software, analysis powder filling process simulation in the powder metallurgy, to establish scale model of the powder loading process in edem. By simulating powder flow pattern in the different time and get it’s picture; then study on the same conditions of iron filling powder process with the experiment, and get characteristics of iron powder flow pattern picture in different time with the high-speed camera, simulation results and experimental results agree better and analyze the difference. Finally according to the powder particles of Different Poisson’s ratio, coefficient of restitution, static friction coefficient, dynamic friction coefficient design the orthogonal experiment, and obtained the optimum parameters, small coefficient of friction powerful on the powder flow.In the study of the filling process, the static, the powder feeding and the different density of the powder particles were analyzed. The numerical simulation of the static state of the powder feeding shoe is obtained at different time, such as the flow condition of the different time, the change of the indirect contact force vector and the velocity of the particle swarm. Send boots powder movement under different speed multiple numerical simulation, obtained the powder in the process of particle group with send the motion state of the powder boots, powder loading in the particle velocity changes, have different conveying powder boots of speed cavity in the powder filling rate, generate and check the. The curves According to two different density of powder particles, two columns, two layers, random and uniform mixing simulation was made to obtain the variation of loading rate, the powder mass distribution in the cavity, the probability of filling different density powder and so on.Finally the classic cross shaped parts and common gear were filled with the powder of that aspect of cross shaped parts of different sizes for the group of numerical simulation to obtain the distribution of mass and pressure distribution and analysis of transverse dimensions and depth of powder filling pressure changes and quantitative assessment of its influence, this round of loading powder study won the packed powder particle movement trend, speed changes, for loading powder after different portion of the powder pressure variation and quality to obtain more homogeneous powder products to provide guidance.