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The authors of this paper propose and provide scientific substantiation for a new technique of producing bimetallic wire from precious metals for jewelry chains. The method is protected with a patent of the Russian Federation. The authors did calculations to define the processing regimes of cold rolling and drawing that would ensure a uniform distribution of the drawing force between the passes thus minimizing the required drawing force parameters. The PROVOL software was used for calculations that accounted for the actual production environment of the Gulidov Krasnoyarsk Non-Ferrous Metals Plant (aka JSC «Krastsvetmet»). The software has a certificate of state registration. Using the developed regimes, experimental studies were conducted to obtain a bimetallic wire with the core made of 925 silver alloy and the shell made of 585 gold alloy. A trial run of the technique, which was conducted by JSC «Krastsvetmet» to produce bimetallic wire for Singapore style chains, resulted in quality products. A study of the structure and properties of long-length deformed semi-finished products showed that the use of the new technique lead to enhanced strength and performance of the bimetallic wire for jewelry chains preventing defects during the chain bending process. Thus, the authors propose a new technique for producing bimetallic semi-finished products from precious metals alloys that helps improve the quality and expand the assortment of finished jewelry products.

Study of the technique to produce bimetallic deformed semi-finished products for jewelry chains made from red gold