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Systems for the manufacture of cavities

A product and cavity technology, which is applied in the field of systems for manufacturing products with a cavity, can solve the difficulties in processing, installation, disassembly and maintenance, increase the difficulty of mandrel stability and precise positioning, and the length of the mandrel and mandrel is long, etc. problem, to achieve the effect of simple and reliable adjustment method, uniform and accurate wall thickness, and guaranteed rigidity

Active Publication Date: 2019-08-20
COVESTRO DEUTSCHLAND AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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.

Method used

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  • Systems for the manufacture of cavities
  • Systems for the manufacture of cavities
  • Systems for the manufacture of cavities

Examples

Experimental program
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Effect test

no. 1 example

[0038] figure 2 is a side view of the first preferred embodiment of the system for manufacturing cavity products of the present invention. Except for the shape of the mandrel, the basic structure of this embodiment is the same as figure 1 Much the same as shown. Such as figure 2 As shown, the system starts from figure 2Starting from the left side, there are a mandrel fixing and adjusting device 5 , a stepped mandrel 4 ′, a fiber impregnation system 3 and a mold 1 . In this embodiment, the fiber impregnation system 3 can be a low-pressure injection box, and the inlet pressure of the injected resin is 0.001-0.1 MPa. Alternatively, the fiber impregnation system 3 can also be a high-pressure injection box, and the inlet pressure of the injected resin is 0.1-15 MPa. The mandrel fixing and adjusting device 5 , the injection box and the mold 1 are each firmly connected to the mold base 2 by at least one fastener, wherein the mandrel fixing and adjusting device 5 is movable al...

no. 2 example

[0043] image 3 is a side view of the second preferred embodiment of the system for manufacturing cavity products of the present invention. Except for the shape of the mandrel, the basic structure of this embodiment is the same as figure 1 and 2 Much the same as shown. Such as image 3 As shown, the system starts from image 3 Arbor fixing and adjusting device 5, tapered mandrel 4", fiber impregnation system 3 and mold 1 are arranged from the left side of the . In this embodiment, fiber impregnation system 3 can be a low-pressure injection box, and the inlet of the injected resin The pressure is 0.001~0.1MPa. Or, the fiber impregnation system 3 can also be a high-pressure injection box, and the inlet pressure of the injected resin is 0.1~15MPa. The mandrel fixing and adjusting device 5, the injection box and the mold 1 are each fastened by at least one The parts are firmly connected to the formwork 2, wherein the mandrel fixing and adjusting device 5 is movable along the ...

no. 3 example

[0048] Figure 4 is a top view of the third preferred embodiment of the system for manufacturing cavity products of the present invention. Except for the shape of the mandrel, the basic structure of this embodiment is the same as Figures 1 to 3 Much the same as shown. Such as Figure 4 shown, from Figure 4 From the left side, the mandrel fixing and adjusting device 5 , variable cross-section mandrel group 40 , fiber impregnation system 3 and mold 1 are arranged. In this embodiment, the fiber impregnation system 3 can be a low-pressure injection box, and the inlet pressure of the injected resin is 0.001-0.1 MPa. Alternatively, the fiber impregnation system 3 can also be a high-pressure injection box, and the inlet pressure of the injected resin is 0.1-15 MPa. The mandrel fixing and adjusting device 5 , the injection box and the mold 1 are each firmly connected to the mold base 2 by at least one fastener, wherein the mandrel fixing and adjusting device 5 is movable along ...

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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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B29C70/52B29C70/54
Inventor 陈湛周志平李志江S·托雷斯艾斌
Owner COVESTRO DEUTSCHLAND AG
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