Hot forging, cold rolling and cold rotary forging are commonly used to manufacture
Nb-Ti single - core
titanium alloy bar. But in cold rolling or cold forging often appear flapping or other defects, the need for surface repair, time-consuming, labor, very unreasonable.
Nb-Ti bars are produced by cold-spun silver to 12.6 mm diameter, annealed at 800℃ and stretched to 3.2 mm diameter. This ensures the finish of the surface and roundness of the titanium rod. The emulsion of molybdenum disulfide, graphite powder, AGAR, trichloroethylene and water is mixed and coated on the surface of titanium alloy bar.
The cold drawing process of Nb25-70%Zr(weight) alloy was studied. The relationship between the tensile die Angle, friction coefficient and tensile force was determined, and the appropriate lubricant was selected. Both
Nb-Zr and Nb-Ti have the properties of aiding tensile, which is suitable for dry Nb-Ti bars.
The experiment proves that the choice of lubricant is the key to the success of stretching. Graphite powder and molybdenum disulphide are added to water and volatile solution, transferred into emulsion and coated on the surface of titanium alloy rod. After drying, a layer of dense film is formed on the surface of titanium alloy rod. This film has large pressure and is not easy to fall off. The tensile die Angle is 12-16°, but the edge Angle is 18-20° better.
