METHOD AND APPARATUS FOR MANUFACTURING CYLINDRICAL CERAMIC TUBES HAVING LOCALIZED IMPRINTS ON THEIR INNER FACES

摘要

ABSTRACTA method of making imprints on the walls of portions of a tube obtainedby the continuous molding of a ceramics-based paste and the cutting upof the tube, wherein immediately after the tube portions have been moldedand are still deformable, they are placed on means parallel with the axisof the tube portions for rotating them around their axes of revolution,means are applied to the rotary means for exerting a pressure on at leasta portion of the tubes so that such portions are clamped between the rotarymeans and the pressure-exerting means, the pressure-exerting means or therotary means are provided with at least one imprint-making tool, the oreach tool having a main direction which does not coincide with the directionof the axes of revolution of the tube portions, and means are applied tocreate a second relative movement between the tube portion and the or eachtool, so that there is substantially no sliding between the tube portionand the or each tool.Application to the making of tubes for enrichment by gas diffusion.