Manufacturing method of pipeline elbow made of composite material

Abstract

The invention provides a manufacturing method of a pipeline elbow made of a composite material, which comprises the following steps of: producing an integral elbow male die, wherein the diameter of the integral elbow male die is 6-10mm larger than that of an elbow die, and producing an inner one-way fiber shell and an outer one-way fiber shell on the integral elbow male die, wherein centering angles of cross sections of the inner one-way fiber shell and the outer one-way fiber shell are 90-180 DEG; producing a lining layer on the elbow die by using one layer of surface mat, two layers of chopped strand mats and annularly wound continuous fiber winding yarns, wherein the outer diameter of the lining layer is equal to the diameter of the integral elbow male die; mounting the inner one-way fiber shell and the outer one-way fiber shell on the lining layer, and arranging the continuous fiber winding yarns and roving cloths alternately to reach a designed thickness; and demolding the elbow die to complete the production after the curing. In the invention, the of designability advantage of the composite material is sufficiently utilized, a laminated structure is optimized, the capacity of bearing a draw-press stress produced by a bending moment of the elbow is improved, risks of leakage and fracture of the elbow are reduced, weak links in a glass steel pipeline are solved, and the stability of the whole pipeline is improved.

Description

technical field [0001] The invention relates to a manufacturing technology of a pipeline elbow, in particular to a manufacturing method of a composite material pipeline elbow with a small diameter (D≤450mm). Background technique [0002] For composite pipe elbows with small diameters (D≤450mm), the current manufacturing method is to use unidirectional fibers and checkered cloth strips for hoop winding on the manufactured elbow male mold, and form them after the resin is cured. For composite elbows manufactured by this process, the strength between fiber bundles and the strength along the fiber direction are much lower. When the pipeline is subjected to high internal pressure or water hammer, cracks are likely to occur between the hoop fiber bundles and the overlap of the grid cloth, resulting in leakage or rupture. Contents of the invention [0003] The technical problem to be solved by the present invention is to propose a method for manufacturing a composite pipe elbow ...

AI Technical Summary

Problems solved by technology

When the pipeline is subject to high internal pressure or water hammer, cracks are likely to occur between the hoop fiber bundle and the lap of the grid cloth, resulting in leakage or rupture