Method for forming irregular ring piece by utilizing stainless-steel rectangular ring rolled piece through thermal bulging

Abstract

The invention discloses a method for forming an irregular ring piece by utilizing a stainless-steel rectangular ring rolled piece through thermal bulging, comprising the following steps of: sleeving the heated stainless-steel rectangular ring rolled piece on the periphery of a pre-heated bulging blockin a bulging machine; starting the bulging machine so that the ring rolled piece is squeezed by the bulging block in a radial direction along the inner circumference surface of the ring rolled piece and becomes the irregular ring blank after being deformed for 11-13%, thus completing primary bulging; rotating the irregular ring blank for 45 degrees along an center axis, thus completing primary rotation; carrying out secondary bulging with the deformation amount of 1.8-2% and secondary rotation on the irregular ring blank according to the previous steps; carrying out tertiary bulging with the deformation amount of 1.4-1.6% and tertiary rotation on the irregular ring blank according to the previous steps; and carrying out quartus bulging with the deformation amount of 1.2-1.4% and quartus rotation on the irregular ring blank according to the previous steps, so as to obtain the irregular ring piece. The size precision of the irregular ring piece can reach 0.1-0.2% of the corresponding size. The irregular ring 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 ring bulging method, in particular to a method for forming a special-shaped ring by thermal expansion of a stainless steel rectangular ring rolling piece. Background technique [0002] Stainless steel rectangular ring-rolled pieces (refer to the ring-rolled pieces with a rectangular longitudinal section) or special-shaped ring-rolled pieces (refer 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 five thousandths ), and due to the high stress of the rolled ring, defects such as warping, deformation or even cracking may easily occur if the control is not good in the subsequent proce...

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 problem of low dimensional accuracy of the ring rolling in the prior art The problem

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