Novel sizing mold for silicon core tube

The utility model relates to a novel sizing mold for a silicon core tube and belongs to the technical field of processing molds for optical cable protective outer tubes. The sizing mold comprises a machine head body, a flow diversion shuttle, an internal mold, a core mold and a mouth mold; the sizing mold is characterized in that a mouth mold sleeve is mounted at a right end of the mouth mold through an inner hexagonal bolt and a mouth mold sleeve fixing block; a core mold sleeve is mounted at a right end of the core mold through an inner hexagonal bolt and a core mold sleeve fixing block. The mouth mold sleeve and the core mold sleeve are mounted on the mouth mold and the core mold of the steel sizing mold in a sleeving manner respectively, so that a product is very high in surface smoothness and fine and smooth in inner and outer walls after materials used for manufacturing the silicon core tube are subjected to a treatment process from shock heating to shock cooling; precipitates are not adhered to the mouth mold, so that the continuity of production is guaranteed; the sizing mold is simple to manufacture, convenient to operate and low in production cost; problems that burrs easily appear on inner and outer walls, the smoothness is poor and a large amount of precipitates are adhered to the mouth mold due to a fact that a silicon core tube is subjected to extrusion molding directly through a gap between a steel mouth mold and a core rod at high temperature in the prior art are solved.