Systems for the manufacture of cavities

Abstract

The invention relates to a system for manufacturing a product with a cavity. The system comprises a core shaft fixing and adjusting device (5), core shafts (4', 4'' and 40), a fiber impregnating system (3) and a mold (1), wherein the core shafts (4', 4'' and 40) penetrate through the fiber impregnating system (3) so as to enable fibers impregnated with resin to be cured into a profile (7) in the mold (1); and at least one part of the core shafts (4', 4'' and 40) is a variable-section core shaft. Since the core shaft with the variable section is adopted, the size of the core shaft close to an inlet of the mold is designed to be consistent to the cavity of the product, and the size of the core shaft far away from the inlet of the mold is designed to be relatively large gradually, the rigidity of the core shafts can be guaranteed, the deformation of the core shafts is not easy, and the jittering in the mold is not easy, so that the uniform and accurate wall thickness of the product is ensured.

Description

technical field [0001] The present invention relates to a system for the manufacture of cavity-filled articles using a mandrel of variable cross-section, particularly suitable for use in the pultrusion process for the manufacture of fiber-reinforced composite materials such as polyurethane-based materials. Background technique [0002] There are quite a few products with one or more cavities in pultruded products. The production process of pultruded products with cavity requires not only the use of molds, but also the use of mandrels and corresponding fiber impregnation systems. Therefore, traditional systems for manufacturing products with cavities all use a mandrel fixing and adjusting device to adjust the position of the mandrel. [0003] figure 1 A system for manufacturing cavity-filled articles is shown, which is common in the prior art. From figure 1 The mandrel fixing and adjusting device 5, the fiber impregnation system 3 and the mold 1 are arranged on the left s...

AI Technical Summary

Problems solved by technology

However, this is difficult to achieve in practice, especially when the cavity is small

[0006] In the polyurethane composite pultrusion molding process, since polyurethane is sensitive to moisture and the operation time is very short, a closed fiber impregnation system (such as an injection box) is usually used, so that the mandrel must be suspended in the injection box and the mold. This results in a longer mandrel length than is typically used in the pultrusion process, further complicating the difficulty of maintaining stable and precise positioning of the mandrel

Such a long mandrel has various difficulties in various aspects such as processing and manufacturing, installation and disassembly, and maintenance.

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