Finite Element Numerical Simulation And Experimental Study On The Process Of Pulverized Coal Compaction

Powder compaction is one of the most important processes in powder forming process.The task of powder forming theory is to analyze and study the forming rules of various powders.In this paper,based on the fem software MSC.Marc,based on the iso-oyane powder yield criterion model,this paper studies the pulverization of coal powder by moulding method.First of all,in the study of theory and technology of coal powder moulding forming analysis of general category of compression molding theory of powder compacting equation,the applicable scope,main characteristics and the theoretical basis of the quantitative describes the crushing theory and equation medium pressure billet density and the central issue of relation between various process parameters.To Shima Oyane yield criterion are derived and corrected Shima-Oyane yield criterion model forms and numerical control parameters and control parameters,the coefficient and the coefficient values input to Marc powder parameter Settings,complete Shima-Oyane yield criterion model for accurate form of pulverized coal mould pressing forming numerical simulation.Then,the simulation model of powder moulding was established,and the geometric model was established in the simulation model of coal powder molding.Selecting the poisson ratio and elastic modulus suitable for pulverized coal pulverization to establish the property sheet of coal powder materials;A suitable contact algorithm is selected to apply the contact constraint to the coal powder,and the contact body definition is studied in the numerical simulation of pulverized coal powder.Select the appropriate loading method to control the rigid body movement;According to the above research,the setting of contact conditions in coal powder simulation is completed.The analysis of the iterative method is suitable to solve the nonlinear problem in the simulation of coal powder forming.When all the definition Settings are completed,the operation is submitted,and a finite element numerical simulation analysis is performed on the coal powder.Second,using powder apparent density meter to moulded coal pulverized coal forming experiment to get the initial relative density,and the specific values,and finally completed the powder in the Marc parameter Settings and Shima-Oyane yield criterion model is established in this paper.Under different thrust pressure to moulded coal forming experiment,get don't have to suppress pressure forming compact density,through the get experimental data suitable for pulverized coal forming mold pressing pressure.Finally,through the numerical simulation process of coal powder molding,the distribution of internal stress of the blank under different pressing pressure is studied to improve the stress concentration in the blank.On average relatively compact density experimental value and comparing the simulation value and validate the mould pressing forming experiments of choice whether pressure is the most suitable for pulverized coal mould pressing forming process of pressing pressure,and the experimental values of density and simulated values comparative analysis to illustrate Shima-Oyane yield criterion model of pulverized coal is appropriate for moulding powder forming process numerical simulation research.The relative density and minimum value of the blank are obtained by analyzing the linear graph of the overall relative density distribution.The axial and radial displacement of the powder body was obtained by analyzing the axial and radial displacement of the powder body.Based on the above research,the feasibility of MSC.Marc in the field of pulverized coal powder forming was determined,as well as whether the compaction forming of coal powder met the Shima-Oyane powder yield criterion model.