Research Of Particle Behavior In The Material Layer Extrusion Of Roller Press

The roller press was designed on the basis of crushed material layer extrusion theory which had achieved the best results in the cement industry, but during the material extrusion process,we still lack of adequate understanding about particles and particles, particle interactions with the roller force and movement law. Therefore, the discrete element technique was used, in-depth study of the roller press material layer extrusion flow behavior of particles can not only optimize the structure and working condition of the roller press, but also enrich layer of extrusion material theory.During the material layer extrusion process the mechanical characteristics of discrete particle was analysed. Based on the discrete element software EDEM and three-dimensional modeling software Solid works, the particle mechanics simulation model was established. The relation of the mechanical characteristics and main parameters during the material layer extrusion process was studied. The analysis of orthogonal test method was used to simulate the flow field of roller press to obtain the main factors which impacts of particle compressive force, particle size, velocity, roller gap, the optimal program is the angular velocity 1.875rad / s, particle size 30mm , roller gap 32mm. Analysis of roller angular velocity, particle size parameters of particles on the impact of maximum pressure and found the angular velocity, particle size and the maximum compressive Force relationship.The optimal parameters on the flow field was used in the discrete particle dynamic simulation. The Compressive Force,Normal Force and Tangential Force distribution of material layer in the process of extrusion were obtained. Analysis showed that the material layer extrusion pressure in the shear stress is always present, but which plays a major role is the Normal Force, particles are not broken extrusion shearing. Contact force from the force chain particles is described in terms of the flow field which is the cause of particle force fluctuations. From the perspective of discrete particles dynamics, the material layer extrusion three-stage theory was well explained.It showed that well control of particle movement will increase roller press yields instructive.The finite element analysis of the frame of roller press , the stress distribution and maximum stress of the column bearing surface, the upper and lower beams were obtained. Then minimizing the objective quality of the frame optimized and getted the desired results. Modal Analysis on the frame, getting the frame of the first six natural frequencies and corresponding mode shapes. Find the large deformation area of vibration model, after optimization design of components, the corresponding deformation decreased significantly and relative displacement diagram tended to be stable. The roller press can opereate safely under different conditions.