Method of coating the inside of a cylindrical member

Abstract

Abstract IN PREFERRED FORM THE INVENTION INVOLVES COATING THE INSIDE OF A PERMANENT MOLD USED IN CENTRIFUGAL CASTING, THE COATING BEING AN INSULATING REFRACTORY. THE MOLD IS ROTATED AT A SPEED SUCH THAT THE COATING MATERIAL SUPPLIED AS LIQUID OR SLURRY WILL BE SPREAD OVER THE INSIDE OF THE MOLD BY CENTRIFUGAL ACTION. WHILE THE MOLD IS ROTATING AN UNBROKEN STREAM OF THE COATING MATERIAL OF SUITABLE CONSISTENCY OR VISCOSITY, WHICH WILL SOLIDIFY ON PASSAGE OF TIME, IS DIRECTED INTO THE MOLD IN AN AXIAL DIRECTION FROM ONE END THEREOF AND AT SUCH AN INCLINATION TO THE AXIS AND WITH SUCH FORCE THAT IT WILL IMPINGE UPON THE INNER SURFACE OF THE MOLD ADJACENT BUT SPACED FROM THE OPPOSITE END WHEREUPON ITS MOMENTUM WILL CAUSE IT TO FLOW TOWARD SAID OPPOSITE END AND PART OF IT TO REACH SAID OPPOSITE END AFTER IMPINGES ON THE SURFACE OF THE MOLD. THIS STREAM AFTER BEING ALLOWED TO FLOW FOR A SUFFICIENT TIME TO COAT THE PORTION OF THE MOLD BETWEEN ITS POINT OF INITIAL IMPINGEMENT AND SAID OPPOSITE END, DIRECTED AT A GRADUALLY LOWERING ANGLE OR PRESSURE OR FROM A GRADUALLY RECEDING PORTION SO THAT IT PROGRESSIVELY IMPINGES AT POINTS CLOSER TO SAID ONE END UNTIL THE ENTIRE INTERIOR OF THE MOLD IS COATED. THE FLOW OF COATING MATERIAL IS THEN SHUT OFF AND ROTATION CONTINUED UNTIL THE COATING SOLIDIFIES SUFFICIENTLY THAT IT WILL REMAIN IN PLACE.

Inventors

• 👤 Nathan Janco

Bibliographic Details