SU813514A1 - Method of joining glass plastic rod with metallinc fittings - Google Patents

Description

(54) METHOD OF CONNECTING GLASS-PLASTIC ROD WITH METAL FITTINGS

one

The invention relates to electrical engineering, in particular, to methods of combining fiberglass rods with metal fittings. Such rods are used to fasten wires, busbars, etc., under high voltage. The most critical element in determining the mechanical strength of an insulating device of this type is the unit for embedding a fiberglass rod into metal reinforcement.

Known methods for connecting insulators with metal reinforcement by crimping using elastic pads are positioned between the reinforcement and the surface of the insulator Cl.

There is also known a method of joining a fiberglass rod with metglichny reinforcement, for example, a cap, which includes placing the reinforcement on the rod with a gap between the surfaces being glued and then pressing the reinforcement. This method is implemented as follows. A fiberglass rod is inserted into the metal cap and subjected to all-round compression on a hydraulic press. To implement

uniform reduction and creation of the necessary distribution of pressures along the tip length of the matrix and punches of complex shape, as well as high dimensional accuracy in the manufacture of tips and rods to maintain a sufficiently small gap 2.

The disadvantages of this method. The need to use high-power press hubs to meet and maintain high precision in the manufacture of rods and heads, which is required to preserve the integrity of fiberglass during crimping.

The purpose of the invention is to increase. The mechanical strength of the zone of joining metal valve with a fiberglass rod and simplifying the manufacturing technology.

This goal is achieved by the fact that according to the method of connecting the fiberglass rod with metal fittings, for example, with a cap,

5, which includes placing the reinforcement on the rod with a gap between the fastened surfaces and the subsequent crimping of the reinforcement, the gap before the crimping of the reinforcement is filled with powder, for example metal, and the crimping is performed by pulsed, for example explosive loading. Pulsed, in particular, explosive crimping allows to achieve significantly higher pressures in the connection zone without destroying fiberglass. The explosive method of crimping does not require expensive equipment and high precision when processing the connected elements, it is simpler and can be used in field conditions. . In the case of pulsed (explosive) crimping, the intermediate layer between the metal reinforcement and the fiberglass rod acquires fundamental importance. In a pulsed crimping method without an intermediate layer, the strength of the joint is low, and cracks appear in the fiberglass rod. As the intermediate layer, as experiments have shown, it is necessary to use a material that is able to effectively absorb the impact energy and is compressed under the influence of / impact loads so as to withstand sufficiently high shear loads that occur during the operation of the finished joint. As materials placed in the intermediate layer, porous metallic and nonmetallic materials (powdered meshes, fibers, spongy materials, etc.) should be used. It is assumed that the role of the porous intermediate layer is that it, in the process of pulsed loading, suppresses excessive sharp shock loads on the fiberglass rod, while at the same time it is pressed, and sufficient shear strength is obtained during the pressing process. In this case, a reliable fit of the intermediate layer of carbon fiber to the fiberglass rod and to the metal reinforcement is ensured. The advantages of the pulsed (explosive) method of crimping metal reinforcement on a fiberglass rod consist in obtaining a higher specific strength in the fiberglass-metal zone, which makes it possible to erase fiberglass in the manufacture of insulators, to reduce the structural height of the insulator and its weight; eliminating the need for precise adjustment of fiberglass walls and holes of metal reinforcement, as well as the dimensions of the matrix, which greatly simplifies the technology of connecting metal reinforcement with a fiberglass rod; simplifying the process of forming the pressure profile in the fiberglass-metal zone, which ensures optimal pressure distribution during the operation of the structures. The connection of the fiberglass rod with metal reinforcement is carried out as follows. I A fiberglass rod is inserted into the metal reinforcement, the free space around the rod is filled up with powder, an explosive is positioned symmetrically outside the metal reinforcement and the explosion is initiated by one of the known methods. When the explosive is detonated on the surface of metal reinforcement, the latter comes in motion and in: it raises the shock wave in the intermediate layer of powder material. As a result of the explosive effect, the powder used as an intermediate layer is pressed and, filling the entire space between the metal reinforcement and the core, provides a firm connection of the fiberglass with the metal reinforcement. The required stress profile is created in the zone where the metal fittings are connected to the fiberglass rod. This is achieved either by imparting the required variable thickness to the metal reinforcement, or by a corresponding change in the power of the explosive on the surface of the metal reinforcement by changing the thickness of the explosive layer. The invention can be used in connection of a fiberglass rod with a metal tip, as well as when sealing several fiberglass rods in metal fittings. FIG. 1-5 depict embodiments of the method. FIG. Figure 1 shows the layout of the elements on the metal plate 5 during the crimping of metal reinforcement 1 (cap) on a fiberglass rod 2 with an intermediate layer of powdered material 3 placed between them using the initiation of explosive 4. In FIG. Figures 2 and 3 show the layout of elements on a metal plate 5 when pressing Metallic reinforcement 1 onto a fiberglass rod 2 with an intermediate / layer of powdered material 3 placed between them by initiating an explosive 4 to create a variable stress pattern in the zone of the metallic reinforcement with fiberglass rod. FIG. 2, the required stress profile is achieved by imparting the required variable thickness to the metal reinforcement. FIG. 3, this is achieved by a corresponding change in the explosive power on the surface of the metal reinforcement by changing the thickness of its layer. FIG. 4 shows a metal connection

the cap 1, the inner surface of which has an annular protrusion 6, with a fiberglass rod 2 in the presence of an intermediate layer 3. In FIG. 5, axisymmetric embedding of the fiberglass rods 2 in the metal reinforcement 1 in the presence of an intermediate layer 3 is shown.

The invention was tested with an axially symmetric connection of a fiberglass rod on an epoxy-polyester bond with a 20-mm grit with a metal cap made of steel. The tests show the high strength of the resulting compound.

Claims (2)

1. Handbook of electrical materials. Ed. Yu. V. Korir, 5 whom and others. V.1, p.2, SEI, 1959,0.297. 2. Electrificazrone, 1971, b, pp. 287-290. Pu.J tpui.2