RU2516233C2 - Method for making weight-reduced pipe (case) of electric connector - Google Patents

Abstract

FIELD: electricity.

SUBSTANCE: invention is related to electric connectors intended for electrical switching between devices of space rockets and aircraft. The pipe is made compound. The threaded section for coupling with the electric connector case is made as a thin-wall ring with an inner thread. The ring is placed into a cavity of a step-like shell from the step side of the maximum diameter and the ring and shell are connected by electric pulse action. The shell is formed of a thin-wall round billet in the form of a seamless step-like cup with a bottom shaped at the step end of the minimum diameter. The bottom is removed partially by circular bead forming and the bead is curled inside of the cup as an inner collar. The collar is expanded from the inside thus forming at the end of the step with the minimum diameter an external collar intended for fixation of the cable shielding.

EFFECT: improving reliability of the pipe by exclusion of its coupling with its geneatrix, performing coupling thread of standard profile, providing reliable electric coupling and low transient resistance between the cable shielding and the electric connector case.

7 dwg

Description

The invention relates to the field of electrical engineering, in particular to electrical connectors designed for switching electrical circuits between devices of rocket and space and aviation equipment, where the question of the need to improve the overall mass characteristics of products is particularly acute.

The typical design of the electrical connection pipe is a thin-walled design that includes four main functional areas: the connection area with the electrical connection housing, the mounting wire placement area, the cable trunk forming zone, and the cable trunk mounting and outlet area.

In most commercially available electrical connectors, the pipe connections (enclosures) of the electrical connectors that limit the installation space and form the cable trunk are made either by turning from a bar, as in PC connectors, or by casting with subsequent machining, as in 2PM connectors. The use of such technologies does not significantly reduce the weight and dimensions of the nozzles, increases their complexity and manufacturing time, and therefore the cost of the connectors.

Significantly helps to improve these indicators, the application of the technical solution according to RF patent No. 2403659 "Method for the manufacture of lightweight pipe (casing) of the electrical connector", in which the sheet blank is folded and its edges are fastened at the joints, forming a shell from which sections of the working surfaces of the pipe are formed by pulsed force directed towards the forming surfaces of the snap, while the perimeter of the inner surface of the shell in any cross section is equal to or greater them perimeter of the inner working surface of the pipe in the same cross section. From fragments of the shell not involved in the formation of the working surfaces of the nozzle, two-layer profiled stiffeners are formed. The height of the ribs, the type of profile, as well as the number and location relative to the working surfaces are selected based on the technical requirements for a particular pipe. If necessary, the layers of profiled stiffeners are brought together, up to contact, and connected to each other, for example, using glue, spot or electric pulse welding, etc.

To reduce the overall dimensions of the nozzle, profiled stiffeners are pressed against the sections of the working surfaces of the nozzles and connect them to each other in the same way as connecting the layers of ribs.

To ensure reliable fastening of the abutting edges of the shell, at least one of the abutting edges is placed between the layers of one of the profiled stiffeners.

The specified method allows to ensure the stability of the wall thickness of the thin-walled pipe, especially at the locations of its working surfaces, while reducing the thickness of the flat workpiece, which, in turn, reduces the weight of the pipe. At the same time, it is possible to produce complex spatial thin-walled equal-strength branch pipe connectors with a high accuracy in the arrangement of their working surfaces.

The specified method is adopted as a prototype.

The disadvantage of this method is the presence of a junction of the edges along the generatrix of the shell, which leads to local thickening of the shell and the unevenness of the shielding properties, due to the presence of transition resistance to circular current, which may occur when external magnetic fields are applied to the pipe.

Another disadvantage of the proposed technical solution is the increased transition resistance between the body of the electrical connector and the nozzle, due to the inability to form a thread profile on a thin-walled nozzle that meets existing standards.

The aim of the proposed technical solution is to increase the reliability of the pipe by eliminating the joint along the generatrix of the pipe and performing a profile of the mating thread that meets current standards.

These goals are achieved by the fact that the pipe is made integral, while the threaded section for docking with the body of the electrical connector is made in the form of a thin-walled docking ring with a thread on its inner surface, which is placed in the cavity of the stepped shell from the side of its step of maximum diameter and connected by electric pulse effect, and the step shell is formed from a round sheet blank in the form of a seamless step cup, at the end of the step of the minimum diameter of which azuyut bedplate, bedplate stepped nozzle is partially removed to form an annular flanging which zavaltsevyvayut inside glass as an internal annular projection, an inner annular ledge distribute inside, forming a step at the minimum diameter end of the outer annular projection for fixing cable shielding.

The essence of the method is illustrated by drawings in figures 1-7.

Figure 1 shows the assembly drawing of the pipe (casing) of the electrical connector.

Figure 2 shows a thin-walled docking ring.

Figure 3, 4 shows two projections of a sheet blank.

Figure 5 shows a seamless stepped glass molded from a sheet blank.

Figure 6 shows a fragment of a stepped glass with a step of minimum diameter and a partially removed bottom and an annular flange formed at its end.

Figure 7 shows a fragment of a stepped glass at the end of which an annular flange is sealed inside the glass with the formation of the minimum diameter of the inner annular protrusion at the end of the step.

A lightened docking ring 2 is obtained from a thin-walled tubular billet, for example, by machining on metalworking equipment with an internal thread 3 that meets existing standards and the external threaded surface of the tail of the body of the electrical connector for which the pipe is intended.

For the manufacture of a stepped shell 4 of a lightweight pipe 1 of an electric connector of complex spatial shape, a round billet 5 is used, which is cut out from a flat thin-walled material, for example, from aluminum foil. From the obtained preform 5, a step glass 6 is formed, for example, by rotational extrusion, with an open step 7 of maximum diameter on one side and a step 8 of minimum diameter with bottom 9, on the other. The bottom 9 of the stepped glass 6 is partially removed, for example, by cutting, and the remaining part, in the form of an inner ring flange 10, is rolled inside the step 8 with a minimum diameter, forming an inner ring protrusion 11, which is distributed from the inside and form an outer ring at the end of the step 8 of the minimum diameter ledge 12.

Lightweight docking ring 2 is placed in the cavity of the stepped shell, from the side of its open step 7 of the maximum diameter. After that, they are interconnected by electric pulse exposure.

After mounting the cable conductors to the contacts of the electrical connector, the pipe 1 is connected to the body of the electrical connector through the thread 3 of the lightweight connecting ring 2, the cable shielding is stretched to the step 8 of the pipe with a minimum diameter, fixed with a bandage, and the mounting space inside the pipe is filled through the process opening with a foam compound. After it is cured, the cable termination unit in the connector is able to reliably withstand operational factors.

Improving the reliability of the pipe is ensured by the stability of its size and electrical characteristics, which, in turn, leads to an improvement in its operational properties.

The shielding properties of the nozzle depend on the thickness of the material of the flat workpiece and can vary widely.

The experimental samples of the nozzles were made of aluminum foil with a thickness of 0.15-0.3 mm. Docking rings were performed by machining thin-walled aluminum pipes.

Implementation of the proposed method allows:

- to provide increased accuracy in the molding of the working elements of the pipe;

- to ensure stability of wall thicknesses of various sections of the pipe in the areas of its working surfaces;

- provide additional strength and rigidity of the pipe and the stability of its size;

- to ensure the stability of electrical parameters by eliminating the junction of the edges along the generatrix of the pipe and improving the quality of the mating thread;

- reduce energy consumption in the manufacture of the pipe and increase the efficiency of its production.

Information sources

1. Romanovsky V.P. Handbook of cold stamping. M .: Mechanical Engineering, 1971.

2. Stepanov V.G., Shavrov I.A. High-energy pulsed metal processing methods. L .: Engineering, 1975.

3. I.V. White, S.M. Fartik, L.T. Khimenko Handbook of magnetic pulse processing of metals. Publishing House at Kharkov State University. Publishing Association "Vishka Shkola", 1977. 55 p.

4. RF patent No. 2113041.

5. RF patent No. 2110381.

6. RF patent No. 2403659 (prototype).

Claims (1)

A method of manufacturing a lightweight pipe (casing) of the electrical connector, in which the thin-sheet blank is molded in the form of a stepped shell with portions of the working surfaces of the pipe, including a threaded section for mating with the case of the electrical connector, characterized in that the pipe is made integral, while the threaded section for docking with the body of the electrical connector is performed in the form of a thin-walled docking ring with a thread on its inner surface, cat The second shell is placed in the cavity of the stepped shell from the side of its open step of maximum diameter and connected by electric pulse action, the stepped shell is formed from a round sheet blank in the form of a seamless stepped cup, the bottom of the step of the minimum diameter forms a bottom, the bottom of the stepped cup is partially removed, forming an annular flanging, which is rolled inside the glass in the form of an inner annular protrusion, the inner annular protrusion is distributed from the inside, forming and end rungs with a minimum diameter of the external annular projection for fixing cable shielding.

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