CS214518B1 - Method of mass soldering of metal chains - Google Patents

Abstract

The invention relates to the field of jewelry production. It solves the problem of eliminating the possibility of mutual connection of two or more chains during their mass soldering in a bundle in a continuous gas furnace as a result of the release of the separator and their surface. The essence of the invention is that to increase the adhesion of the separating mass to the surface of the chains, the chains are moistened before its application.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention

The purpose of soldering metal chains is to increase the mechanical properties, i.e. to increase the strength and to reduce the risk of breaking. . '

The prior art soldering method consists in thoroughly cleaning the chain with subsequent application of the solder mixture, which is manually wiped into the space between the wire ends of the individual links, resulting in the joining of both ends during soldering. In order to prevent soldering of cells between them, a separator, which is a slip or float chalk, is used. In this operation, the so-called slipping, there is perfect prcmísehí and wrapping of individual cells with a separator. The actual brazing takes place in a continuous gas furnace at a temperature of 700 to 1050 ° C, while the throughput time depends on the thickness of the brazed chain and on the flame intensity. After brazing, a manual stretching is performed, which is a check of the strength of the chain. This is followed by pickling, rinsing, drying and bundling.

A disadvantage of this present method of soldering metal chains is the soldering of only one chain in a continuous gas furnace. In the case of mass soldering of the whole chain of chains, they are often soldered to each other due to the imperfect adhesion of the separating powder mass when the chains hit each other. Locations with soldered cells must be removed mechanically, resulting in economic losses.

These drawbacks are overcome by the brazing process of the metal chains according to the invention, in which the entire bunch of chains provided with the brazing mixture is passed through the braze through a continuous furnace, the principle being to moisten the bunch of chains before wrapping with the release material.

By the method according to the invention, the release mass moistened in a liquid, e.g. water, adheres to the individual chain links so as to form a perfect wrap around them which prevents their soldering to one another during soldering operations.

This exemplary embodiment of the bulk soldering method illustrates the invention in more detail without restricting it in any way.

The bundle of tombac chains after thorough rinsing in tri-chloroethylene is wiped with solder, ie solder is inserted between the wire ends at the end of the wire (by the end), which fuses the individual links by melting. The solder used is a mixture of powdered brass (Ms 60), castor oil and tri-chloroethylene. The chain bundle thus treated is then moistened with water. Upon wetting, so-called slipping is carried out, i.e. wrapping the individual cells with a powder slide (aqueous magnesium silicate) to prevent soldering of the cells with each other, after which the chain of bands is soldered in a continuous gas soldering furnace at a temperature of 85 ° C.

Claims (1)

SUBJECT OF THE INVENTION Method of mass soldering of metal chains in a bundle in a continuous brazing furnace provided with a solder mixture, characterized in that the bundle of chains is moistened before being wrapped with a release material.