Method for rolling and shaping nickel-based high-temperature alloy special-shaped ring forging

Abstract

The invention discloses a rolling and shaping method for a nickel-based high temperature alloy heterotypic ring forging in order to obtain the alloy heterotypic ring forgings with excellent tissues and properties as well as realize accurate rolling. The method includes the following steps: alloy bar material is heated, carried out continuous upsetting and deformed by 60 to 65 percent so as to be made into a solid cake and then is punched again to lead the alloy bar material to be made into a hollow round cake after the aperture dimension of the alloy bar material is 30 to 35 percent of the dimension of the outer diameter thereof; a rectangle ring blank is obtained after the hollow round cake is heated, rolled circularly and deformed by 20 to 25 percent; a rectangle pre-rolling blank is obtained after the rectangle ring blank is heated, rolled circularly and deformed by 20 to 25 percent again; the pre-rolling blank is heated and arranged in a rolling die of a ring rolling machine and becomes a heterotypic ring forging after being rolled and deformed by 40 to 45 percent in a section groove of the die. When in expansion, the broadening speed of the pre-rolling blank along the radial direction is 2mm / s to 15mm / s with a radial rolling force of 40000kg to 220000kg. The method is mainly used for the shaping of the heterotypic ring forging of an aeroengine or a gas turbine. The method can be adopted to obtain the heterotypic ring forging that is arranged in a flow line along the outline of a part.

Description

technical field [0001] The invention relates to a rolling forming method of a ring forging, in particular to a rolling forming method of a nickel-base superalloy special-shaped ring forging. Background technique [0002] Special-shaped ring forgings of aero-engines or ground gas turbines made of nickel-based superalloys (such as GH4169 and other material grades), such as casings and other parts, require forgings to have good performance and structural stability due to long-term work in harsh environments . [0003] The Chinese invention patent specification CN 1586754A published on March 2, 2005 discloses a method for rolling and forming a ring with an outer step section. The longitudinal section of the ring is a non-rectangular outer step shape, that is, the ring The piece belongs to a special shape of the special-shaped ring forging. The method includes blanking, billet making, rolling and subsequent processing. The special-shaped rings rolled by this method are realized...

AI Technical Summary

Problems solved by technology

When using this process to roll special-shaped rings of different shapes, the roll type needs to be replaced again, and frequent change of roll type will increase manufacturing costs, prolong the production cycle, and is not conducive to equipment maintenance

[0004] The above ring forming method does not disclose the specific process steps of rolling nickel-based superalloy special-shaped ring forgings. The amount of deformation has a great influence on the structure and performance of ring forgings. If the amount of deformation is not selected correctly, it will cause defects such as coarse grains, crushing, cracking, and flashing of ring forgings, which will affect the delivery and use of forgings.

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