MACHINE FOR MANUFACTURING SHELL MOULDS FOR LOST-PATTERN PRECISION CASTING

摘要

A machine for the manufacture of lost-pattern shell-moulds for precision casting, comprising a plurality of eliminable central pattern armatures or a group of eliminable patterns, each fixed on an operating head by means of which the pattern or cluster is successively dipped into immersion tanks of liquid refractory slurry and of refractory grains in fluidized suspension, in which the armature is rotatably mounted about three axes of rotation, the first being the vertical axis of a roundabout carrying operating heads on frames and bringing the heads by a discontinuous movement on rotation, successively above the various tanks located round the roundabout, the second axis of continuous rotation coinciding substantially with that of the armature and the third axis, perpendicular to the second, passing through the center of a circumference to which the second axis is tangential, the armature being external to the circumference while the roundabout, each armature and each operating head are respectively driven by first, second and third motors, the first and third motors being controlled automatically in such manner that the rotation of the armatures and their operating heads about their third axis is an angularly limited pivotal movement sufficient to dip the pattern or the cluster of patterns into each tank and to remove them from the tanks during the interruptions in the rotation of the roundabout.