SU1722858A1 - Method for production of thick-walled shells from laminated plastics - Google Patents

Abstract

The invention relates to the manufacture of shells of composite materials by the winding method, in particular, to methods for producing thick-walled shells of laminated plastics, and can be used in the manufacture of large-sized pipes and other products. The method of making thick-walled laminated plastics shells involves winding a material (tape) with a different binder content on the mandrel: from 10-25% in the first layer to 30-45% in the latter, while the binder content is distributed linearly across the thickness of the binder. After winding, the billet is heated to the curing temperature, which allows improving the quality of the products. 1 tab.

Description

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The invention relates to the manufacture of shells made of composite materials by the winding method, in particular, to methods for producing thick-walled shells of laminated plastics, and can be used in the manufacture of large-sized pipes and other products.

A known method of manufacturing thick-walled shells of laminated plastics involves winding the material on the mandrel and heating it to a curing temperature.

This method leads to the appearance of different density across the shell, which affects the physicomechanical characteristics of the material and, therefore, does not provide an adequate product quality.

Closest to the present invention is a method for making thick-walled

shells of laminated plastics, including winding the material on the mandrel and heating it to the curing temperature, while winding is carried out with materials with different curing temperatures, laying the inner part of the workpiece from a material with a lower curing temperature, and outer - from a material with a higher curing temperature after which heating is carried out with sequential exposure at the curing temperature of the inner, and then the outer parts of the workpiece.

The disadvantage of this method is that in the manufacture of a thick-walled shell of reinforced plastics by winding a tape (rope) impregnated with a polymer binder on a mandrel

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the inner shells are more tightly wound during winding than outer shells.

The purpose of the invention is to improve the quality of the product.

The goal is achieved by the fact that in the method of manufacturing thick-walled shells of laminated plastics, including layer-by-layer winding of a fiber-filled preform material impregnated with a thermosetting binder, on a mandrel and heating the billet to a curing temperature, the content of the binder in the blank material during layering on the mandrel is increased linearly from 10–25% in the first layer to 30–45% in the last.

A tape impregnated with a polymeric binder is wound on a mandrel, with the first layer of the preform being laid with a tape containing 10-25% binder, and the last with a binder content of 30-45%, the binder content is distributed linearly in the preform material.

Example 1. In the manufacture of an AF-1 OBO-grade fiberglass shell based on T-10-80 glass fabric (GOST 19170-73) impregnated with AF-U binder (OST 92-0957-74), Laying layer-by-layer winding of T-10-80 glass fabric onto the mandrel, while the content of AF-10 binder in T-10-80 glass fabric is varied linearly in the thickness of the workpiece from 15% of the binder content in the first wound layer of the workpiece to 30% in the last layer. Changing the content of AF-10 binder in fiberglass T-10-80 over the layers of the workpiece is carried out by squeezing rollers installed after the impregnation bath with the binder or in front of the fabric stacker on the mandrel. After that, the workpiece is cured at 160 ° C. During curing, the workpiece is evacuated.

PRI mme R 2. In the manufacture of the carbon-fiber shell of the UP-URAL-Tr-Eho brand based on the URAL-Tr-312-15-Echo fabric (TU 6-06-4108-84) and the binder FN (TU 6 -05-1187-75) Ural-Tr-312-15-Echo fabric is layered on the mandrel, and the content of the binding FN in the fabric varies linearly in thickness of the preform from 25% of the binder in the first layer of the preform to 40 % in the last layer. At the end of the winding, the workpiece is cured at 155 ° C4, OMP. When curing the workpiece, it is evacuated.

Example 3. In the manufacture of an EF-32-301 plastic shell on the basis of the T-11 fabric (GOST 19170-73) and the EF-32-301 binder (OST 92-0957-74), layer-by-layer winding is performed T-11 fabric on the mandrel, while the content of the binder EF-32-301 in T-11 fabric varies linearly across the thickness of the workpiece from 10% to 35%. Then production of the billet at 175 ° C and pressure of 1.0 MPa.

Example 4. In the manufacture of a casing of plastic based on T-11 fabric (GOST 19170-73) and a binder, PN-605 (TU 6-05- 431-78), the fabric is layered at Thereby, the content of the binder in the fabric is varied by layers of the preform, i.e. linear through the thickness of the workpiece from 25% in the first layer to 45% in the last layer. Then the workpiece is cured at 150 ° C and a pressure of 1.0 MPa.

The table shows comparable comparative data on the different densities of the shells in the thickness of plastics obtained by the proposed method and the method of the prototype.

Under the thickness of the workpiece material, a characteristic was chosen for its thickness, determined by the dependence

to 100% 1

where the density of the material of the inner part of the workpiece, kg / m;

pi is the material density of the outer part of the workpiece, kg / m3.

The high value of the different densities in the prototype method is explained by the non-uniform compaction of the material of the workpiece along its thickness at. curing, curving and peeling layers of the outer part of the workpiece at the time of curing the inner part of the workpiece.

The use of the proposed method allows, in comparison with the known ones, to improve the quality of the product by ensuring uniformity of compaction of the material of the workpiece in thickness when it is cured, reducing the different density of the material in the thickness of the shell, eliminating the curvature of the layers of the outer part of the workpiece during curing of the layers of the inner part of the workpiece.

Claims (1)

Claims The method of manufacturing thick-walled shells of laminated plastics, including layer-by-layer winding of a material of a fiber-filled preform material impregnated with a thermosetting binder onto a mandrel and heating the billet to a curing temperature, characterized in that, to improve the quality of the product, the content of the binder in the material is when layered winding on the mandrel increase linearly from 10-25% in the first layer to 30-45% in the last layer.