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RESEARCH PRODUCT

Filling defects in a ceramics forming process

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Publisher Summary This paper presents a simple semi-heuristic method to predict mold filling defects in a porcelain forming process. It involves both a mechanical modelling of this process as a squeezing flow, and a postprocessing calculus that unable a defects prediction as soon as the shape and the size of artistic reliefs are known. This shape analysis is carried out with a multi resolution wavelet analysis. The chapter models the filling stage and to propose a criterium to avoid any filling defect that could waste the quality of the drawings. It illustrates a simplified modelling of the process during which the “turning” stage is approximated by the deformation under pressure of a Norton Hoff ceramics paste squeezed between the mandrel and the averaged surface of the mold. The problem is solved with the Hele Shaw equations generalized to the case of a Norton Hoff's materials on an axisymetrical shell with appropriate boundary conditions.