Process for forming special-shaped ring workpieces from bearing steel rectangular rolled ring workpieces by hot bulging

Abstract

The invention discloses a process for forming special-shaped ring workpieces from bearing steel rectangular rolled ring workpieces by hot bulging, which includes: sleeving a heated bearing steel 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 8%-11% 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%-2% and completing the secondary rotation; completing the tertiary bulging with deformation of 0.5%-1% and completing the tertiary rotation; completing the fourth bulging with deformation of 0.5%-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 a rectangular ring rolling piece of bearing steel into a special-shaped ring. Background technique [0002] Rectangular ring-rolled pieces of bearing steel (referring to ring-rolled pieces whose longitudinal section is a rectangular section) or 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 limitation of 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 is not...

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 dimensional accuracy of the ring rolled piece existing in the prior art low problem

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