Production method for large thick-wall nickel-contained ring forgings

Abstract

The invention discloses a production method for large thick-wall nickel-contained ring forgings. According to the technical scheme, the method comprises the steps of blank forming, ring rolling and heat treatment. The generation of inner circle collapse and grooves of the upper end face is effectively avoided by increasing the height of a blank, reasonably distributing the radial and axial deformation amounts and increasing the feed rate of a conical roller in the ring rolling process. The ring forgings are spread out after being rolled, are subjected to air cooling to be 250-350 DEG C and then are loaded into a furnace for annealing. Therefore, the requirements for the microstructure, performance and the like of rolled steel are met.

Description

technical field [0001] The invention belongs to the technical field of production of iron and steel materials, and relates to a production method of a ring forging, in particular to a production method of a large thick-walled nickel-containing ring forging. Background technique [0002] Ring rolling, also known as rolling or reaming, through the repeated coordinated deformation of the material in the radial and axial double deformation zones, makes the ring blank produce sufficient plastic deformation and volume transfer during the growth process, combined with reasonable temperature control , can obtain an optimized material microstructure, thereby forming high-quality high-quality ring parts. The ring rolling process plays an important role in the production of medium and small ring parts such as bearing rings and gear blanks. With the rapid development of industry, whether it is electric power, offshore oil platforms, civil ships, or extra-large heavy machinery, military ...

AI Technical Summary

Problems solved by technology

[0005] (1) The weight of large thick-walled nickel-containing ring forging blanks often exceeds 5t, and the blank volume is large. It is difficult to reasonably distribute the diameter and axial deformation of the final ring forging blank size during the ring rolling process, resulting in grooves or upper edges on the upper end surface of the ring forging. Collapse of the inner circle of the end face

By increasing the production allowance in the height and inner diameter direction of the ring forging, defects such as grooves can be turned off, but the yield of the ring is low;

[0006] (2) By increasing the heating temperature of the ring forgings, the hot-working plasticity of the steel is increased. Although this method eliminates the groove defects on the upper end surface of the large ring forgings, due to the high final rolling temperature of the rings, the grains of the finished ring forgings are coarse. uneven organization;

[0007] (3) Large-scale thick-walled nickel-containing ring forgings have large dimensions, and the thermal processing process is in a state of high temperature, high pressure and unstable forming, and the finished ring forgings have a large ellipse

[0008] (4) In the later stage of ring rolling, due to the rapid growth rate of the ring diameter and the failure to adjust the force of the holding roller in time, the ellipticity of the ring will eventually be large, but the ring size is large and the ring wall is thick, so the ellipticity is not easy be corrected;

Images