SU1208587A1 - Method of manufacturing glass-reinforced plastic rods - Google Patents

Abstract

The invention relates to a method of manufacturing glass-reinforced plastic rods having a cavity, designed to accommodate fasteners. In order to reduce the material consumption of fiberglass rods while maintaining their equal strength in the cavity zone, the latter is molded by inserting a process liner into a bundle of impregnated glass fibers immediately before pulling them through the forming die. Then a bundle of fibers with an insert is pulled through the forming die with simultaneous heat treatment. The liner can be removed from the cured product before cutting or after cutting, and, if necessary, left in the product and used as a piece of reinforcement. 3 il. from 5S (L GS about 00 00 00 J

Description

The invention relates to electrical engineering and power engineering, and can be used in the manufacture of rod antenna insulators, stretch elements of supporting structures, traverse bars, and deep well pumps, etc.

The purpose of the invention is to reduce the material capacity of fiberglass rods while maintaining their equal strength in the cavity zone to accommodate fasteners.

FIG. 1 shows the manufacturing scheme for the fiberglass rods in FIG. 2 - fiberglass rod with technological contribution; in fig. 3 - the cross section of the stern with the insert.

The method is carried out in the following manner.

The glass fiber material is unwound from the bobbin spool 1. Then using guides 2 and 3. the glass fiber material 4 enters the propietic bath 5 with a thermosetting binder. The impregnated fibrous material 4 passes through the guideline 6 into the vacuum chamber 7, after which an insert 8 is inserted into the impregnated glass fiber material corresponding to the configuration that one wishes to receive in the product. The impregnated glass fiber material 4 with the inlay 8 is pulled through the forming die plate 9 with the heater 10 by means of a pulling device 11, the liner 8 is removed from the cured product 12 immediately before cutting or after cutting the product. If necessary, the liner is left in the product and later used as an element of reinforcement.

The geometrical dimensions of the liner B are selected from the conditions for the free passage of the voluminous material with the insert through the forming die plate 9, and the cross-sectional area of the liner 8 is determined by the formula

t

-5 1 where s

euft 0,90g))

- the cross-sectional area of the insert a; Sf. - hole area mold

R

spy die;

- technological coefficient of filling the product with fiber, defined as the ratio of the total

cross-sectional area of fibers to the total cross-sectional area of the product.

Example. Fiberglass rods are manufactured for rod insulators with a mounting cavity designed to connect the rod to the reinforcement using a wedge. In that

case, the case 8 is implemented as. a thin plate (Fig. 2), the transverse edges of which have cylindrical ends 13. The width of the insert is chosen from the condition of free passage through the die plate on one side and the minimum gap between the insert and die plate on the other. The length of the liner is chosen based on the requirements for the wedge joint. In cross-section, the insert 8 has a rounding radius (FIG. 3) equal to the radius of the internal hole of the die. The diametral section area of the cylindrical end 13 of the insert 8 in accordance with formula (1) is equal to:

7J

6k l

(2)

4 0.90 G

where Sgi is the area of the diametrical section of the cylindrical end;

dj, is the diameter of the inner hole of the die; K is the technological coefficient of filling the rod with fiberglass.

The liner is coated with an anti-adhesive composition, for example, a SKT rubber solution in toluene, or is made of a material that does not have adhesion to the binder, for example, from a fluoroplastic.

The proposed method ensures the equality of the number of glass fibers in the areas of fixing the rods in the reinforcement and outside these areas, which reduces the material consumption of the rods (due to ensuring their equal strength throughout the length) and their cost .. In addition, due to the decrease in

surface defects in the manufacture of 1-r. Research Institute of rods increases their reliability.

Claims (1)

Invention Formula A method of making fiberglass rods, consisting in molding cavities in them to accommodate fasteners, in which a bundle of glass fibers is impregnated with a thermosetting binder, drawn through a forming die, heat treatment materials are cut and cut, characterized in that, in order to reduce material consumption while maintaining The SRI of equal strength of the rod in the zone of the cavity for placing the fastening elements, the cavity is molded by introducing a technological contribution into the bundle of impregnated glass fibers before pulling through the forming die. FIG. 2 TO Editor A.Revin fig.Z Compiled by V.Payma Tehred M. Parotsay Proofreader L. Pilipenko Order 295/59 Circulation 644 Subscription VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 Branch PPP Patent