HOT ISOTHERMAL ROLL FORMING METHOD OF TITANIUM ALLOY

摘要

A manufacturing method for a hot isothermal roll formed article of a Ti-6Al-4V titanium alloy, which is far economical than other methods by substantially reducing the number of manufacturing processes and simplifying a manufacturing mechanism contributing to the manufacturing processes, and improves strength reliability of the article by maximally using fluidity of metal structures, is provided. A method for hot isothermal roll forming of a titanium alloy comprises the steps of: (a) manufacturing a preform(110) for manufacturing a final roll formed article; (b) mounting the manufactured preform on a mandrel(220) of a roll forming apparatus(200); (c) increasing temperature of the mandrel and the preform to a processing temperature of 800 to 1000 deg.C at which microstructures of the titanium alloy can be spheroidized in a heating furnace; (d) rotating the preform at a rotary speed corresponding to a forming strain rate of a titanium alloy formed article ranging from 10^-3 to 10^-5/sec by the roll forming apparatus; and (e) roll forming the roll formed article into a final shape. The step(b) is performed by mounting the manufactured preform on a mandrel installed between a spindle(210) and a tailstock(230) of the roll forming apparatus and formed in an electric resistance furnace that is a reheating furnace(300), the step(d) is performed by driving the spindle of the roll forming apparatus to rotate the preform, and the step(e) is performed by roll forming the preform in a hot isothermal section while moving a forming roll(240) along a rotary central shaft of the preform.