Method for thermally bulging aluminium alloy rectangular ring rolled piece

Abstract

The invention discloses a method for thermally bulging an aluminium alloy rectangular ring rolled piece. The method comprises the following steps: sleeving a hot rolled aluminium alloy rectangular ring rolled piece on the peripheries of preheated bulging blocks in a bulging machine and starting the bulging machine to ensure the bulging blocks to radially extrude the ring rolled piece from the inner circumferential surface of the ring rolled piece to complete first bulging, wherein the bulging temperature is 330-400 DEG C, the bulging time is 15-20 seconds, the dwell time is 12-14 seconds and the deformation amount is 0.5-0.9%; then ensuring the ring rolled piece to rotate 45 degrees along a central axis to complete first rotation; later, carrying out second bulging according to the above operations, wherein the bulging temperature is 290-350 DEG, the bulging time is 18-30 seconds, the dwell time is 13-16 seconds and the deformation amount is 0.6-1%; rotating the ring rolled piece again in the first rotation direction to complete second rotation; and then carrying out third bulging according to the above operations, wherein the bulging temperature is 250-320 DEG C, the bulging time is 25-35 seconds, the dwell time is 20-23 seconds and the deformation amount is 0.6-1.1%. The dimensional accuracy of the bulged ring rolled piece can be 1-2 per mill of the corresponding dimension. The method is mainly used in the fields such as aerospace.

Description

technical field [0001] The invention relates to a bulging method for a ring, in particular to a thermal bulging method for an aluminum alloy rectangular ring rolling piece. Background technique [0002] Aluminum alloy rectangular ring-rolled pieces (referring to ring-rolled pieces with rectangular cross-section in longitudinal section) are generally not high in dimensional accuracy due to the influence of rolling process and equipment limitations after being rolled by ring rolling mills; only in the shape of 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. 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 CN101367104A published on February 18, 2009 discloses a hydraulic bulging strengthening process for ...

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Problems solved by technology

However, this method does not disclose in detail how to improve the dimensional accuracy of the ring through bulging, but only generally concludes 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 ring rolled piece existing in the prior art low problem

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