Process for forming special-shaped ring workpieces from aluminum alloy rectangular rolled ring workpieces by hot bulging

Abstract

The invention discloses a process for forming special-shaped ring workpieces from aluminum alloy rectangular rolled ring workpieces by hot bulging, which includes: sleeving a heated aluminum alloy rectangular rolled ring workpiece onto the periphery of a preheated bulging block in a bulging machine, squeezing the rolled ring part by the bulging block radially from the inner circumference surface of the rolled ring part after starting the bulging machine, completing the primary bulging after the rolled ring part is deformed by 10%-18% to form a special-shaped ring blank, completing the primary rotation by rotating the special-shaped ring blank around the center axis by 45 degrees; completing the secondary bulging by repeating the above steps to deform the specials-shaped ring blank by 1.3%-2% and completing the secondary rotation; completing the tertiary bulging with deformation of 1.3%-2% and completing the tertiary rotation; completing the fourth bulging with deformation of 0.8%-1%; and finally obtaining the special-shaped ring workpiece. The dimension precision of the special-shaped ring workpiece can be 1%.-2%. of the corresponding dimension, and is mainly used for making rotor parts such as cylindrical casings and the like in the aerospace field.

Description

technical field [0001] The invention relates to a ring bulging method, in particular to a method for thermally expanding an aluminum alloy rectangular ring rolled piece into a special-shaped ring. Background technique [0002] Aluminum alloy rectangular ring-rolled pieces (referring to the ring-rolled pieces with a rectangular longitudinal section) or special-shaped ring-rolled pieces (referring to the ring-rolled pieces with a non-rectangular section in the longitudinal section) are rolled by the 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 one thousandths) 5), and because of the high stress of the rolled ring-rolled piece, defects such as warping, deformation or even cracking may easily occur if the control i...

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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