Thermal bulging method of stainless-steel irregular ring rolled piece

Abstract

The invention discloses a thermal bulging method of a stainless-steel irregular ring rolled piece, and the method comprises the following steps of: sleeving the hot-rolled stainless-steel irregular ring rolled piece on the periphery of a pre-heated bulging block in a bulging machine; starting the bulging machine so that the ring rolled piece is squeezed from the inner circumference surface of the ring rolled piece in a radial direction, thus completing primary bulging, wherein the bulging temperature is 910-970 DEG C, the bulging time is 18-30 seconds, the pressure holding time is 8-9 seconds and the deformation amount is 0.9-1.1%; rotating the ring rolled piece around a center axis for 45 degrees, thus completing primary rotation; carrying out secondary bulging according to the previous steps, wherein the bulging temperature is 870-930 DEG C, the bulging time is 18-30 seconds, the pressure holding time is 12-14 seconds and the deformation amount is 0.8-1%; rotating the ring rolled piece according to a primary rotating direction again, thus completely secondary rotation; and carrying out tertiary bulging according to the previous steps, wherein the bulging temperature is 820-890 DEG C, the bulging time is 28-40 seconds, the pressure holding time is 18-20 seconds and the deformation amount is 0.6-0.9%. The size precision of the bulged ring rolled piece can reach 0.1-0.2% of the corresponding size. The bulged ring rolled piece formed by using the method disclosed by the invention is mainly used for fields of aerospace and the like.

Description

technical field [0001] The invention relates to a bulging method for a ring, in particular to a thermal bulging method for a stainless steel special-shaped ring rolling piece. Background technique [0002] Stainless steel special-shaped ring-rolled pieces (referring to the ring-rolled pieces whose longitudinal section is non-rectangular section) 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 the shape of special-shaped ring-rolled pieces In the case of ideal and excellent equipment performance, the dimensional accuracy can reach 3‰~5‰ (three thousandths to five thousandths) of the corresponding size, and the special-shaped ring after rolling has a large stress. 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 publi...

AI Technical Summary

Problems solved by technology

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, this method cannot solve the dimensional accuracy of the special-shaped ring rolling existing in the prior art low problem

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