Production tooling and production method of a solid-wall co pipe

Abstract

The invention relates to a production tooling of a solid-wall CO pipe. An expansion mold is arranged between an extrusion die and a vacuum water cooling device; the expansion mold is fixed on a core mold via a screw rod; the expansion mold is coniform; a thin end of the expansion mold faces towards the extrusion die; a thick end of the expansion mold faces towards the vacuum water cooling device; the expansion mold is in smooth transition from the thin end to the thick end; the relationship among the diameter D1 of the thin end of the expansion mold, the diameter d of the core mold and the diameter D2 of the thick end of the expansion mold is as follows: D1 is greater than 0.8d and less than 0.95d, and D2 is greater than 1.8d and less than 2.2d. A solid-wall CO pipe blank plasticized and extruded by a tapered twin-screw extruder still has plasticity under the shield of hot air at 110-130 DEG C; after expansion by the expansion mold, the wall thickness of a pipe wall has better uniformity; a dense layer structure is generated; stress on the pipe wall is offset by an interatomic acting force in a molecular chain; the molecular chain is stretched; physical properties such as mechanical strength, toughness and cracking resistance of the pipe are greatly improved.

Description

technical field [0001] The invention belongs to the technical field of production of solid-wall CO pipes, and in particular relates to a production tool and a production method of solid-wall CO pipes. Background technique [0002] In the prior art, after using a conical twin-screw extruder to plasticize and extrude a solid-walled CO tube, it is cooled and preformed through the air section and directly entered into a vacuum water cooling device for solidification and molding. See figure 1 , the diameter of the solid-wall CO tube is determined by the outer mold and core mold of the extrusion die. In the production process, due to the fluctuation of feed pressure and temperature, the wall thickness of the PVC pipe often changes slightly, reducing its strength; and the molecular structure in the pipe wall is randomly distributed, and its strength and toughness are difficult to further improve. These are all constraints. Application of solid wall CO tubes. Contents of the inve...

AI Technical Summary

Problems solved by technology

In the production process, due to the fluctuation of feed pressure and temperature, the wall thickness of the PVC pipe often changes slightly, reducing its strength; and the molecular structure in the pipe wall is randomly distributed, and its strength and toughness are difficult to further improve. These are all constraints. Application of solid wall CO tube

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