SU1142302A1 - Method of manufacturing shaped articles from composite materials - Google Patents

Abstract

A METHOD FOR MAKING PRODUCTS OF COMPLEX PROFILE FROM COMPOSITE MATERIALS, including making the preform fabrics in the shape of the product being made, imparting the product form to the space in it, impregnating it with a polymeric binder, then curing it, making it harder. the forms of the manufactured product are carried out by impregnating the binder of individual annular zones along the length of the workpiece, followed by the formation of rigid annular strips introduced into the cavity of the workpiece ring expansion.

Description

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The invention relates to the processing of composite materials and can be used in various sectors of the national economy in the production of gas ducts, valves and other tubular products of a complex profile.

A known method of manufacturing pipes of a complex profile involves winding material onto the mandrel 1.

The disadvantage of this method is the complexity of the design of the used mandrel, which must be collapsible or destructible, which complicates and increases the cost of manufacture of curved pipes.

A known method of manufacturing products of a complex profile from composite materials includes making a fabric blank according to the shape of the product to be made, shaping the product into space in the space, impregnating with a polymeric binder and then curing it 2.

The disadvantage of this method is to obtain a shell that is not closed in cross section of the form, while contour elements specially made for each shell are required to give the preset to a given shape, which complicates the method.

The purpose of the invention is to reduce the complexity of manufacturing products.

The goal is achieved in that according to the method of manufacturing products of a complex profile from composite materials, including making a fabric blank according to the shape of the product to be made, shaping the shape of this product in it, impregnating with a polymeric binder and then curing it, shaping the blank of the product to be manufactured is done by connecting individual annular zones along the length of the workpiece with the subsequent formation of rigid annular bands introduced into the cavity of the workpiece by ring-opening.

FIG. 1 shows a scan of the workpiece from transverse strips of fabric; in fig. 2- scan of the workpiece from the longitudinal strips of fabric; in fig. 3 — bending operations; in fig. 4 and 5 - the form of the sewn billet; in fig. 6 - forming annular bands; in fig. 7, 8, and 9 are embodiments of annular spikes; in fig. 10, 11 - giving the blank the shape of the manufactured product.

The method of manufacturing complex profile products from composite materials is carried out as follows.

Depending on the conditions of orientation of the reinforcing threads of the fabric relative to the axis of the product, the fabric is cut into transverse 1

(see Fig. 1), or longitudinal 2 (see Fig. 2) strip. In the first case, the weft 3 is oriented along the AB axis, in the second - the warp 4,

With the formation of a fabric blank of a given geometrical dimensions, bands 1 and 2 are ssushivaet on lines m and 4. Then sshchite bands 1 and 2, bend along the axis AB and spread out with a given overlap 5 so as to form trapeziums on both sides of the axis AB with extension to line m CD and Ci DI. Loosely, the trapezium overlap 5 is sushchayu along the edges of the seam b and in the center of schv 7, and the coincident lines CD and Cj DI schvom 8, form a multi-layer sleeve 9.

The multilayered sleeve 9 prepared in this way is put on an annular unclenching 10, where it is stretched with a screw 11, a spring 12 and an annular strip 13 of elastic material, 0 forming a ring 14. At the same time, this section of the multilayer sleeve 9 is pre-saturated with a thermosetting binder 15 ( cm, fig. 7), which is cured during the molding of the ring 14. Heating is carried out using the radiator 16.

Thermoplastics may be used as a binder. In this case (see Fig. 8), when forming the multi-layer sleeve 9, between the layers of woven strips 1 0 and 2, the strips 17 are made of a thermoplastic material, which is melted by means of the radiator 16 and then cooled.

In the manufacture of products of larger diameter (see Fig. 9), ring lining 18 is molded to increase the stiffness of the rings 14.

After the ring 14 is formed, the annular unclenching 10 is moved inside the sleeve 9 to a predetermined distance where the next ring G4 is being formed. In this way, the shape of the product to be made is shaped into the preform.

To give the final shape, the sleeve 9 is placed with rings 14 on the collars 19 mounted on the uprights 20, and with the help of the straps 21 attached to the stops 22, they are stretched (see Fig. 10).

The predetermined shape of the product can be provided by sagging (see Fig. 11). In this case, the sleeve 9 is guided over the edge of the ring 14 with the help of a pull 21.

Then the entire sleeve 9 is impregnated with binders and cured.

Thus, this invention allows to significantly reduce the complexity of the process of manufacturing products 5 complex profile while maintaining its quality.

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Claims (1)

METHOD FOR PRODUCING COMPLEX PROFILE PRODUCTS from composite MATERIALS, including fabricating workpieces according to the shape of the manufactured product, shaping the product in space, impregnating it with a polymer binder and then curing it, characterized in that, in order to reduce the complexity of manufacturing the product, shaping the workpiece the manufactured product is carried out by impregnating a binder of individual annular zones along the length of the workpiece with subsequent molding of rigid annular bands introduced into the cavity billet ring expansion. FIG. 1 1 G42302