Method for thermally bulging special titanium alloy ring rolled member

Abstract

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.

Description

technical field [0001] The invention relates to a bulging method for a ring, in particular to a thermal bulging method for a titanium alloy special-shaped ring rolling piece. Background technique [0002] Titanium alloy special-shaped ring-rolled pieces (referring to ring-rolled pieces with non-rectangular longitudinal sections) are rolled by ring rolling mills. Due to the influence of rolling process and equipment limitations, their dimensional accuracy is generally not high; only in special-shaped ring-rolled pieces When the shape is ideal and the performance of the equipment is excellent, the dimensional accuracy can reach 3‰~5‰ (three thousandths to five thousandths) of the corresponding size. , If the control is not good in the subsequent processing steps, defects such as warping, deformation and even cracking may easily occur. [0003] The Chinese invention patent specification CN101367104A published on February 18, 2009 discloses a hydraulic bulging strengthening pro...

AI Technical Summary

Problems solved by technology

Since this method relies on the flexible contact between the liquid and the inner peripheral surface of the ring to cold-expand the rectangular ring, it can only be suitable for some materials with small deformation resistance. Its main function is to strengthen the ring. Materials such as titanium alloys and special-shaped rings are not applicable; and this method does not disclose in detail how to improve the dimensional accuracy of the ring through bulging, but it is generally concluded that the purpose of improving the forming accuracy of the retaining ring can be achieved, that is, the method It cannot solve the problem of low dimensional accuracy of special-shaped ring rolling pieces in the prior art

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