Near-net compound forming method for large ring with sudden change in wall thickness

Abstract

The invention discloses a near-net composite forming method for a large-scale sudden change in wall thickness ring. The small-diameter rectangular cross-section ring billet after forging and punching is heated and kept warm, taken out and put on a hot-rolled ring machine for rolling. When the outer diameter grows to Stop rolling when the target size is reached to obtain a large-diameter rectangular cross-section ring billet, take it out and heat it for heat preservation; put the large-diameter rectangular cross-section ring billet into the forming mold for thermoforming, obtain the desired shape of the special-shaped cross-section ring billet, take it out and heat it for heat preservation; Ring rolling near-net shape—put the special-shaped cross-section ring billet on the ring rolling machine for fine ring rolling, and use special-shaped rolls to form the ring section profile, and stop rolling when the outer diameter grows to the target size to obtain rings with abrupt wall thickness ; Put the ring with sudden change in wall thickness on the bulging machine quickly, and use the waste heat to perform thermal bulging to improve the dimensional accuracy and roundness and improve the distribution of residual stress. After bulging to the target size, continue to hold the pressure, and take it out after cooling to room temperature. Get the target ring. This method has high forming precision.

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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