精密ろ過膜による加工液のろ過 : 第4報, 旋回流を用いた研削加工液のクロスフロー精密ろ過

抄録

Recent developments in the precision grinding technology of advanced ceramics have been remarkable. However, ceramic swarf floating in grinding fluids causes scratches on the ground surface, deteriorating the surface finish. Ceramic swarf is extremely fine hard nomagnetic substance and this shape is relatively particulate with low specific gravity. Therefore, the removal of ceramic swarf by the conventional filtration system becomes very difficult. In this report, the experimental and theoretical analyses of the cross-flow microfiltration of grinding fluids were examined and the influence of swirling flow of suspension on the membrane permeation flux was clarified. A swirling flow type inlet was set on the front edge of a cross-flow microfiltration apparatus. Cross flow microfiitration of grinding fluids was carried out using a cellulose-type membrane for microfiltration, with a pore diameter of 1μm. The influences of Reynolds number, feed concentration on the membrane Permeation flux and the solute rejection, respectively were examined. A filtration model based on the lateral migration theory was applied to calculate the time-decline curve of the membrane Permeation flux. The calculated results agreed qualitatively with the experimental results and the adequacy of this model was confirmed.