Abstract
The paper presents the results of studies of the structure and properties of a wire with a diameter of 0.5 mm from an alloy of the Al-REM system with a rare-earth metal content of 7–9%. Wire obtained as a result of the implementation of the technology of its manufacture using the methods of casting into an electromagnetic mold (EMM), continuous extruding, and drawing. The rheological properties of the metal of continuously cast round billets from the experimental alloy obtained using an electromagnetic mold are determined. The modeling and analytical assessment of the possibility of carrying out the process of combined rolling-extruding (CRE) of such billets in a closed box-type roll groove of a continuous extruding unit are carried out. The features of metal shaping have been studied. The temperature-speed and technological parameters were found at which the CRE process can be carried out in a stable mode of operation. Data have been obtained for the forces acting on the die and rolls during rolling-extruding. The results of experimental studies of the process of obtaining longish deformed semi-finished products from an experimental alloy on the laboratory unit CRE-200 and the pilot plant unit CRE-400 are presented. The structure of the metal has been studied; data on the ultimate tensile strength, yield strength, relative elongation, and electrical resistance of hot-extruded rods and wires in cold-worked and annealed states have been obtained. It was found that the proposed processing modes make it possible to obtain by the method of combined rolling-extruding rods with a diameter of 9 mm in industrial conditions from longish billets with a diameter of 18 mm, cast by means of EMM. Wire in a cold-deformed and annealed state with a diameter of 0.5 obtained by drawing from the rods with a diameter of 9 mm from an experimental alloy of the Al-REM system containing 7–9% rare-earth metals with the required physical and mechanical properties.
Highlights
Deformed longish semi-finished products in the form of rods, wire rods and wires made of aluminum alloys are widely used for the manufacture of electrical products [1-5]
In the manufacture of electrical conductors for aircraft operating at elevated temperatures high-alloyed aluminum alloys with rare earth metals (REM) are most used, which have the necessary complex of mechanical, electrical properties and thermal resistance
This is due to the fact that in the rolling zone there is a decrease in the contact area of the billet with the rolls along the corner elements of the groove and the value of the force supplied by the rolls decreases
Summary
Deformed longish semi-finished products in the form of rods, wire rods and wires made of aluminum alloys are widely used for the manufacture of electrical products [1-5]. In the manufacture of electrical conductors for aircraft operating at elevated temperatures (up to 250 °C) high-alloyed aluminum alloys with rare earth metals (REM) are most used, which have the necessary complex of mechanical, electrical properties and thermal resistance. Since these alloys have a limited resource of plastic properties the use of traditional technologies for obtaining deformed semi-finished products from them (for example, discrete extrusion on horizontal hydraulic extruders) has not found wide application in industry. This led to a high cost of semi-finished products due to the high labor intensity and high energy consumption for their production
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
