Numerical Simulation And Preparation Technology Of UHMWPE Sinter Plate Filter Substrate Forming Process

Aiming to resolve the problems of complex processing technique, unpublished prescription of raw material, import dependence, high price and limited polularization in Sinter plate filter producing, preparing the sinter plate filter substrate by the way of powder suppression sintering with ultra high molecular weight polyethylene (UHMWPE) instead of the conventional composite material is studied herein. The numerical simulation and experiment method were adopted to study the effect of particle sizes of UHMWPE and volume compression ratio on the performance of the substrate of the filter. Accoring to the particular function acquirement of sinter plate filter, the R&D of UHMWPE sinter plate filter substrate is preformed to obtain optimalizing parameters, which provides guidance of UHMWPE sinter plate filter substrate producing.The relationship between particle sizes of UHMWPE and loose density is studied by experiment. The effect of forming pressure on green density, porosity and compression ratio was investigated through powder cold forming, and the UHMWPE compression strain-stress curves varied with different particle sizes were obtained. Results indicated that the loose density decreases with the particle size reduces, green density and compression ratio increases with the forming pressure rising, while the porosity decreases. The results provide reference for material characteristic configuration in numerical simulation and producing process formulation.Based on the powder yield model of Shima-Oyane, the numerical simulation is performed to study the influence of particle size and volume compression ratio on powder flow and relative green density in the UHMWPE sinter plate filter compression forming process. The feasibility of Shima-Oyane model in silumation of polymer powder compression process is validated therein.It is concluded that the relative density distribution tends to be uniform while the volume compression ratio and particle size reduces, and the relative density increases with the volume compression ratio rises and particle size decreases. The optimal process parameters,which was400-450μm for particle size and1.7for volume compression ratio were obtained by preparing UHMWPE sinter plate filters in various process parameter and taking measurement of key parameters for product properties. Scanning electron microscope(SEM) were used to observe the qualified parts. The result showed that there was numerous3D space in the porous material with smooth surface, which were connected to each other and the shape of sintering neck is good.It can be concluded that it is a effective way of UHMWPE powder suppression sintering to prepare Sinter plate filter substrate. The comparation of simulation result and experimental result indicates that the Shima-Oyane model is a reliable method to study compression process of UHMWPE porous materials.