Abstract
The operation of drawing is widely used in the production of multilayered polymetallic bars and wire. This operation involves pulling a semifinished product through a convergent drawing channel. One example of the use of this technology is the production of bimetallic and trimetallic low-temperature-superconducting semifinished products for the magnetic system of the international experimental thermonuclear reactor (IETR) now being built in Russia [1]. The technology used to make superconductors entails multiple repetitions of the processes of assembling, pressing, drawing, and annealing composite materials. The superconductors being used for the IETR are distinguished by their great length (up to 30 km). The materials lose their superconducting properties if the composite semifinished product ruptures during its fabrication or subsequent welding. Thus, the drawing operation which is used in the technology employed to make superconducting products is the part of the production process that poses the greatest danger of disturbing the integrity of the superconducting semifinished product.
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