RU2152306C1 - Method of manufacture of articles from thermoplastic composite materials by winding - Google Patents

Abstract

FIELD: manufacture of structural materials in aeronautical engineering, electrical engineering, shipbuilding, mechanical engineering, oil-and-gas industry, construction engineering and medical industry. SUBSTANCE: method includes preheating of semifinished items. Matrix component is molten, wound on mandrel and force is applied at area where filaments are laid on mandrel. Reinforcing and matrix filaments are used fibrous semifinished items. Preheating is combined with impregnation of reinforcing filaments by means of hot roller. In applying the force at area where filaments are laid on mandrel, article is molded by means of additional hot roller. EFFECT: reduced duration of technological cycle; reduced power requirements; improved service characteristics of thermoplastic composite material. 1 dwg

Description

 The invention relates to the manufacturing technology of structural materials for the aviation, electrical, shipbuilding, engineering, oil and gas, construction, medical industries and is intended for the manufacture of products from thermoplastic composite materials (TCM) by winding.

 Known methods of manufacturing products from thermoplastic composite materials by winding various types of fibrous semi-finished products, when the whole process is divided into two stages. One of the methods is to use a combination of alternating reinforcing and matrix (thermoplastic) fibers according to the “fiber technology” method [1], when after winding the fiber system onto the mandrel, the obtained preform is formed by one of the known methods (press, autoclave, etc.).

 The main disadvantages of this method include significant costs for material and technical equipment (press, autoclaves, etc.), as well as the low productivity of the process.

 The closest in technical essence and the achieved results to the proposed invention is a method of manufacturing products from TCM by the method of winding, in which the fibrous semi-finished products are preheated, the matrix component of the semi-finished products is melted, wound on the mandrel and apply force in the place of laying the fibers on the mandrel [2].

 The disadvantages of this method are, firstly, the double heating of the thermoplastic material to the melting temperature and, therefore, the danger of negative changes in mechanical and other properties as a result of thermo-oxidative degradation, and secondly, the low productivity of the process.

 The aim of the invention is to reduce the time of the technological cycle of production, reduce energy-intensive jobs and, as a result, increase the operational characteristics of the thermoplastic composite material in the product.

 This goal is achieved due to the fact that reinforcing and matrix fibers are used as fibrous semi-finished products, preliminary heating is combined with the beginning of the impregnation of the reinforcing fibers by means of a hot rolling roller, and when a force is applied at the place of laying the fibers on the mandrel, the product is formed using an additional hot roller.

 The winding circuit is shown in the drawing. The method is carried out in one stage as follows. The threads of two types - non-fusible reinforcing 1 and fusible matrix 2 are unwound from different bobbins and, passing through the collecting ring 3 and the folding mechanism 4, are laid on a thermally insulated mandrel 5. When laying, they alternate through one.

 Next, the threads pass through a system of hot rolling rollers 6 and 7. The first roller 6 (top) in the direction of rolling carries out the rolling of the threads, transporting the matrix threads (in case of breakage), and also preheating, while the reinforcing fibers are impregnated. Before the second roller, the fibers are melted using a jet of hot air supplied from the nozzle 8, and the roller 7 (side) monolizes the melt, that is, the product is formed on the mandrel. After winding, the product is cooled and removed from the mandrel.

 Example. The process was carried out according to the scheme depicted in the drawing. Unidirectional rings of standard size were wound (diameter 150 mm, width 10 mm). For winding, polycaproamide yarns and fiberglass yarns (VMP composition) were used. Technological process parameters are given in table. 1. The physicomechanical characteristics of the obtained materials were determined (Table 2).

 Thus, the proposed method provides a one-stage technological process, which makes it possible, firstly, to increase the operational characteristics of the composite material in the product, to reduce the energy consumption of the process due to a significant reduction in the time of temperature exposure to the thermoplastic matrix, and secondly, to significantly increase the productivity of the process due to Combining operations of winding a workpiece, impregnating reinforcing fibers and molding a product.

Literature
1. Fiber technology for processing thermoplastic composite materials / G.S. Golovkin, V.A. Goncharenko, V.P. Dmitrenko et al. Ed. G.S. Golovkina.- M .: Publishing House of the Moscow Aviation Institute, 1993, 232 p.

 2. Pat. 2053124 RF, IPC B 29 C 53/72. A method of manufacturing a composite product (prototype).

Claims (1)

 A method of manufacturing products from thermoplastic composite materials by the method of winding, in which the fibrous semi-finished products are preheated, the matrix component of the semi-finished products is melted, wound on the mandrel and a force is applied at the place of laying the fibers on the mandrel, characterized in that reinforcing and matrix fibers are used as the fibrous semi-finished products, preliminary heating is combined with the impregnation of reinforcing fibers by means of a hot rolling roller, and when a force is applied at the place of laying windows on the mandrel carry out the molding of the product using an additional hot roller.

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