PVC-O pipe fluid blowing-up type bell mouth forming process

Abstract

The invention discloses a PVC-O pipe fluid blowing-up type bell mouth forming process. The PVC-O pipe fluid blowing-up type bell mouth forming process comprises the following steps of: inserting a core mold into a pipe; adsorbing the pipe under a negative pressure and heating; locking and closing a cavity; carrying out high-pressure fluid blowing-up forming; and separating the core mold from the pipe. According to the invention, through negative pressure adsorption, the inner wall of the heated pipe is tightly attached to the outer wall of the core mold, so that the PVC-O pipe is prevented from retracting in the axial direction in the heating process; and therefore, the orientation characteristic of the bell mouth part of the PVC-O pipe is achieved, the strength, toughness and impact resistance of the bell mouth part are improved, the problem that a bell mouth manufactured through a traditional process is prone to breakage and crack is solved, and the water conveying safety of the PVC-O pipe is guaranteed.

Description

technical field [0001] The invention relates to the field of PVC-O pipe production equipment, in particular to a PVC-O pipe fluid inflation type socket forming process. Background technique [0002] PVC-O pipe is a kind of oriented pipe obtained by heating PVC-U pipe to a high elastic state and biaxially stretching. It has the characteristics of high strength, high toughness and impact resistance. The traditional PVC-O pipe socket forming process widely used at present is: one end of the pipe is heated and inserted into the flaring mold, and the built-in forming slider is opened under the action of force, and the softened pipe wall is propped up by mechanical force, and then cooled and shaped. Disadvantages of this process: During the molding process of the PVC-O pipe socket, high temperature heating is required, and the molecular biaxial orientation structure that has been finalized will shrink under heating, losing orientation characteristics, and making the strength of th...

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Problems solved by technology

[0003] The purpose of the present invention is to provide a PVC-O pipe fluid inflation type socket forming process, which solves the problem that the strength, toughness and impact resistance of the PVC-O pipe socket in the background technology are greatly reduced after processing and forming

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