SU1836761A3 - Contact element manufacture technique - Google Patents

Description

The invention relates to the production of electrical connectors and can be used in the manufacture of integral molded fork elastic contact elements consisting of petals, boxes and shank.

The purpose of the invention is to improve the quality of contacts by eliminating the formation of microcracks.

This goal is achieved by local replacement of the nickel layer necessary for corrosion protection in two layers:

= a nickel layer with a thickness that avoids the appearance of cracks during bending, and a tin layer that allows to achieve the necessary anti-corrosion effect.

First, a nickel layer is applied over the entire contact surface with a thickness that avoids cracking during shaping. and then, in the zone of the working lobes, the nickel thickness is brought to the norm of the sublayer for gold, and after the gold covers the zone of the working sections of the lobes, the rest of the contact surface is coated with tin to the length until it mates with the gold coating. Since tin is a soft material, the areas covered by it do not give cracks during the formation of the box; the maximum possible yield is obtained.

In FIG. 1 shows a tape (segment) after cutting down the reamer of contact elements, where 1 is a petal, 2 is a box. 3 shank, 4 - carrier tape with technological holes 5: in FIG. 2 - nickel coating of the entire workpiece; in FIG. 3 - an increase in the nickel coating thickness of the petal zone: in FIG. 4 - gold coating of the zone of the petals; in FIG. 5 - 180 ° turn and tin alloy coating of the box area, the shank and the carrier tape; in FIG. 6 - contact element after shaping.

Example. A tape wound on a drum after passing through a die stamp

Ί836761 AZ takes the form of FIG. 1. This tape from the reamers of contact elements is also wound on a drum - for transmission to the galvanic section. Then the tape, consisting of reamers of contact elements, 5 is pulled through a nickel plating bath (Fig. 2, surface A) and a layer is applied with a thickness that avoids the appearance of cracks during bending. Through _{: the} next bath the tape passes at the south elevated, local nickel is produced to the norm of the sublayer under the gold surface • in the zone of the petals. Then the tape passes the washing baths, then the local gilding bath again again only the surface of the B-zone of the petals, then the washing bath again, after which the tape rotates 180 ° and passes the local tinning bath with the tin alloy of the carrier tape, shank and box zone for a length of 20 before pairing with a gold coating, passing the bath with the petals up - FIG. 5, surface C.

Further, the well-known process of forming the box, calibrating, 25 possible orientation, installing contacts in the insulator and disconnecting the contacts from the workpiece (from the carrier tape) continues.

So, reducing the nickel sublayer on the sections of the box to be bent to a thickness of 30 to avoid cracking during bending, and coating these sections with tin alloy, which allows achieving the necessary anti-corrosion effects, has the positive effect of improving the quality of the contacts, as a result, the% yield is increased.

In addition, the tinned shanks are ready for soldering and no additional operation is required for their tinning after assembly.

Claims (1)

Claim A method of manufacturing contact elements consisting of petals, a box and a shank, including cutting down from the reamer of the contact element reamers, sequential electroplating first of all of the reamer surface of the contact elements with nickel, then with gold of the working zone of the petals, shaping and calibration, installation in the insulator and separation of the contact elements from the tape characterized in that, in order to improve the quality of the contacts, nickel plating is carried out in two stages, first cover the entire surface ^{4 of the} contact layer the nickel is thick in order to avoid cracking during further shaping of the contacts, and then in the zone of the working lobes the nickel thickness is adjusted to the norm of the sublayer for gold, and after covering the working zone of the petals with gold, the remaining contact surface is coated with tin to the length until it is mated to the gold coating . Piece of tape Fig.2 Nickel plating Fig. 3 Local nickel plating FigA Fig.5 Fig Local Local background (sla5 οποία) Editor Compiled by Tehred M. Morgenthal Proofreader M. Andrushenko Order 3024 Circulation Subscription VNIIIPI of the State Committee for Inventions and Discoveries under the State Committee for Science and Technology of the USSR 113035, Moscow, Zh-35, Raushskaya nab., 4/5 Production and Publishing Combine Patent, Uzhgorod, 101 Gagarin St.