Discrete Element Simulation on Optimization of Processing Parameters in Dry-Pressing Molding of Ceramic Powders

The discrete element model of dry-pressing molding for Bi2O3 ceramic powders was used to investigate the influences of processing parameters (such as pressure, compression speed, friction coefficient, etc.) on the porosity of green body. The results were compared with those of dry-pressing molding tests. The results show that there was a significant effect on the compaction of green body for pressure, compression speed and friction coefficient, etc. The greater the pressure, the smaller the compression speed, the smaller the friction coefficient between particles and between particles and die, the smaller the forming porosity of green body, the better the compactibility of the green body. In addition, small and uniform particles were close to the upper punch, while large particles were close to the lower punch during the dry-pressing experiments. It was consistent well with the trends of the porosity of green body in the direction of height in discrete element simulation.