Thermal bulging method for aluminum alloy special-shaped ring-rolled piece

Abstract

The invention discloses a thermal bulging method for an aluminum alloy special-shaped ring-rolled piece. The method comprises the following steps of: assembling a hot-rolled aluminum alloy special-shaped ring-rolled piece on the periphery of a preheated bulging block in a bulging machine, and starting the bulging machine to make the bulging block extrude the ring-rolling piece radially from the inner circumferential surface of the ring-rolled piece to finish first bulging, wherein the bulging temperature is 350-410 DEG C, the bulging time is 15-20 seconds, the dwelling time is 11-14 seconds, and the deflection is 0.4-0.8 percent; rotating the ring-rolled piece by 45 degrees along a central axis to finish a first rotation; performing second bulging according to the operation above, wherein the bulging temperature is 300-370 DEG C, the bulging time is 20-30 seconds, the dwelling time is 16-18 seconds, and the deflection is 0.5-1.1 percent; rotating the ring-rolled piece once according to a first rotating direction to finish second rotation; and performing third bulging according to the operation above, wherein the bulging temperature is 270-330 DEG C, the bulging time is 30-40 seconds, the dwelling time is 25-28 seconds, and the deflection is 0.5-1.1 percent. The size accuracy of the bulged ring-rolled piece can be up to 1-2 per thousand of a corresponding size; and the aluminum alloy special-shaped ring-rolled piece is manly applied to the 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 an aluminum alloy special-shaped ring rolling piece. Background technique [0002] Aluminum alloy special-shaped ring-rolled pieces (referring to 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 special-shaped ring-rolled pieces When the shape is ideal and the performance of the equipment is excellent, the dimensional accuracy can reach 3‰~5‰ (three thousandths to five thousandths) of the corresponding size. , 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 CN 101367104A published on February 18, 2009 discloses a hydraulic bulging stre...

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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. It is only generally concluded that the purpose of improving the forming accuracy of the retaining ring can be achieved, that is, this method cannot solve the size of the special-shaped ring rolling that exists in the prior art. The problem of low precision

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