Method for thermally bulging high-temperature alloy rectangular ring rolled member

Abstract

The invention discloses a method for thermally bulging a high-temperature alloy rectangular ring rolled member. The method comprises the following steps of: sleeving a hot rolled high-temperature alloy rectangular ring rolled member on the periphery of a pre-heated bulged block in a bulging machine, and starting the bulging machine to enable the bulged block to extrude the ring rolled member from the inner circumferential surface of the ring rolled member in a radial direction, so that bulging for the first time is completed, wherein the bulging temperature is 800-850 DEG C, the bulging time is 20-30 s, the pressure maintaining time is 9-10 s, and the deformation is 0.6-0.8%; rotating the ring rolled member along a central axis for 45 DEG, so that rotating for the first time is completed; then, carrying out bulging for the second time according to the above operations, wherein the bulging temperature is 770-820 DEG C, the bulging time is 20-30 s, the pressure maintaining time is 17-18 s, and the deformation is 0.7-0.9%; rotating the ring rolled member again according to the first rotary direction, so that rotating for the second time is completed; and carrying out bulging for the third time according to the above operations, wherein the bulging temperature is 740-790 DEG C, the bulging time is 30-40 s, the pressure maintaining time is 25-28 s, and the deformation is 0.8-1%. The size precision of the bulged ring rolled member can be up to 0.001-0.002 of that of corresponding sizes. The ring rolled member disclosed by the invention is mainly applied to the fields, such as 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 high-temperature alloy rectangular ring rolling piece. Background technique [0002] After the high-temperature alloy rectangular ring-rolled piece (referring to the ring-rolled piece with a rectangular cross-section in the longitudinal section) is rolled by the ring rolling mill, due to the influence of the rolling process and equipment limitations, its dimensional accuracy is generally not high; only in the shape of the ring-rolled piece 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. If the control is not good in the follow-up processing process, defects such as warping, deformation and even cracking may easily occur. [0003] The Chinese invention patent specification CN 101367104A published on February 18, 2009 discloses a hydraul...

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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, superalloys 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, this method cannot solve the existing problems. The problem of low dimensional accuracy of ring rolling parts in

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