Hot bulging method for forming rectangular titanium alloy rolled ring into special-shaped ring

Abstract

The invention discloses a hot bulging method for forming a rectangular titanium alloy rolled ring into a special-shaped ring; the hot bulging method comprises the following steps of: sleeving a heated rectangular titanium alloy rolled ring at the periphery of a preheated bulging block of a bulging machine, starting the bulging machine so that the bulging block extrudes the rolled ring along the radial direction on the surface of the inner circumference of the rolled ring till the deformation amount of the rolled ring is 10%-12%, and the rolled ring is formed into a special-shaped ring blank, thereby completing primary bulging, and then leading the special-shaped ring blank to rotate by 45 degrees along a central axis to complete primary rotation; and afterwards, according to the operation, carrying out secondary bulging with 0.9%-1.5% of deformation amount and secondary rotation, third bulging with 0.9%-1.5% of deformation amount and third rotation, and fourth bulging with 0.5%-1% of deformation amount on the special-shaped ring blank, thereby obtaining the special-shaped ring. The dimensional accuracy of the special-shaped ring can reach 0.1%-0.2% of the corresponding dimension; and the special-shaped ring is mainly applied to the fields of aerospace and the like.

Description

technical field [0001] The invention relates to a method for bulging a ring, in particular to a method for thermally expanding a rectangular rolled titanium alloy ring into a special-shaped ring. Background technique [0002] Titanium alloy rectangular ring-rolled pieces (referring to the ring-rolled pieces with a rectangular longitudinal section) or special-shaped ring-rolled pieces (referring to the ring-rolled pieces with a non-rectangular longitudinal section) are rolled by a ring rolling mill, due to the limitations of the rolling process and equipment The dimensional accuracy is generally not high; only when the shape of the ring-rolled piece is ideal and the equipment performance is excellent, the dimensional accuracy can reach 3‰~5‰ of the corresponding size (three thousandths to one thousandths) 5), and because of the high stress of the rolled ring-rolled piece, defects such as warping, deformation or even cracking may easily occur if the control is not good in the ...

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 is only suitable for some materials with small deformation resistance, and its main function is to strengthen the ring. For materials with greater deformation resistance For example, titanium alloys and bulging rectangular rings into special-shaped rings are not applicable; and this method does not disclose in detail how to improve the dimensional accuracy of rings through bulging, but generally draws that the forming accuracy of the retaining ring can be improved. Purpose, that is, this method cannot solve the problem of low dimensional accuracy of ring rolling pieces existing in the prior art

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