METHOD FOR HOT BULGE-FORMING TITANIUM ALLOY IRREGULARLY-SHAPED RING-ROLLED WORKPIECE

摘要

A method for hot bulge-forming a titanium alloy irregularly-shaped ring-rolled workpiece, having the steps of: sleeving a hot-rolled titanium alloy irregularly-shaped ring-rolled workpiece (10) over the periphery of a preheated bulge-forming block (3) in a bulge-forming machine, activating the bulge-forming machine to allow the bulge-forming block to squeeze the ring-rolled workpiece along the radial direction from the inner circumferential surface of the ring-rolled workpiece, thus completing a first bulge-forming, where the temperature for bulge-forming is between 790°C and 850°C, where the time for bulge-forming is between 14s and 19s, where the time for pressure-keeping is between 11s and 13s, and where the amount of deformation is between 0.3% and 0.8%; then, rotating the ring-rolled workpiece by 45° along the central axis, thus completing a first rotation; subsequently, performing, on the basis of said procedures, a second bulge-forming, where the temperature for bulge-forming is between 760°C and 820°C, where the time for bulge-forming is between 14s and 19s, where the time for pressure-keeping is between 11s and 13s, and where the amount of deformation is between 0.5% and 1%; rotating once again the ring-rolled workpiece in the direction of the first rotation, thus completing a second rotation; and performing, on the basis of said procedures, a third bulge-forming, where the temperature for bulge-forming is between 720°C and 790°C, where the time for bulge-forming is between 18s and 25s, where the time for pressure-keeping is between 15s and 17s, and where the amount of deformation is between 0.7% and 1%. The method increases dimensional accuracy of the ring-rolled workpiece, and eliminates for same the shortcomings of deformation and warping.