Near-net composite forming method for large wall thickness sudden change ring part

Abstract

The invention discloses a near-net composite forming method for a large wall thickness sudden change ring part. The method comprises the steps of: carrying out heating and heat preservation on a forged and punched small-diameter rectangular-section ring blank, taking out the small-diameter rectangular-section ring blank, and placing the small-diameter rectangular-section ring blank on a hot ring rolling mill for rolling, stopping rolling when the outer diameter is increased to a target size to obtain a large-diameter rectangular-section ring blank, taking out the large-diameter rectangular-section ring blank, and carrying out heating and heat preservation; placing the large-diameter rectangular-section ring blank in a forming die for hot forming, obtaining a special-shaped-section ring blank in the required shape, taking out the special-shaped-section ring blank, and carrying out heating and heat preservation; finish ring rolling and near-net forming, specifically, placing the special-shaped-section ring blank on the ring rolling mill for finish ring rolling, carrying out near-net forming through a special-shaped roller to obtain the section contour of the ring part, and stopping rolling when the outer diameter grows to the target size to obtain the wall thickness sudden change ring part; and rapidly placing the wall thickness sudden change ring part on a bulging machine, carrying out thermal bulging through waste heat to improve the dimensional accuracy and the roundness and to improve residual stress distribution, continuing to maintain pressure after bulging is carried out to the target size, cooling the ring part to room temperature and then taking out the ring part to obtain a the target ring part. According to the method, the forming accuracy is high.

Description

technical field [0001] The invention belongs to the technical field of plastic processing, and in particular relates to a near-net compound forming method for a large-scale abrupt change in wall thickness ring. Background technique [0002] Large rings with sudden change in wall thickness refer to rings with a diameter of more than 1 meter in which the shape of the cross-sectional profile changes sharply, such as casing rings. Rings with such complex structures are usually formed into rectangular cross-section rings by ring rolling, and then A large number of cutting processes are required to obtain the desired shape of the special-shaped cross-section ring. This method not only has low material utilization and low processing efficiency, but also destroys the distribution of metal streamlines and weakens the mechanical properties of the ring. Contents of the invention [0003] The purpose of the present invention is to provide a near-net compound forming method for a large...

AI Technical Summary

Problems solved by technology

[0002] Large rings with sudden change in wall thickness refer to rings with a diameter of more than 1 meter in which the shape of the cross-sectional profile changes sharply, such as casing rings. Rings with such complex structures are usually formed into rectangular cross-section rings by ring rolling, and then A large number of cutting processes are carried out to obtain the desired shape of the special-shaped cross-section ring. This method not only has low material utilization rate and low processing efficiency, but also destroys the metal streamline distribution and weakens the mechanical properties of the ring.

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