Roll forming method for cobalt-based superalloy thick-wall ring forgings

Abstract

The invention discloses a roll forming method for cobalt-based superalloy thick-wall ring forgings. The roll forming method comprises the following steps: designing an intermediate billet into specially-shaped ring billets each of which is provided with a lug boss close to the inner wall; calculating the size of each specially-shaped billet according to an isovolumetric principle; designing a special die according to the shape and size of each specially-shaped ring billet; heating a cobalt-based superalloy rod to a deformation temperature, carrying out upsetting, punching and pre-rolling, and then manufacturing the cobalt-based superalloy rod into specially-shaped ring billets under the action of the special dies; heating the specially-shaped ring billets to the deformation temperature again, and rolling the specially-shaped ring billets into the thick-wall ring forgings by matching with appropriate rolling parameters. According to the method disclosed by the invention, the defects of grooves, folding and the like occurring in the thick-wall ring forging rolling process can be effectively overcome, and the rolling quality of the thick-wall ring forgings can be improved. The roll forming method can be used for roll forming of the thick-wall ring forgings.

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 cobalt-based superalloy thick-walled ring forging. Background technique [0002] The rolling forming of the ring refers to the plastic forming method in which the wall thickness is reduced and the inner and outer diameters are increased under the action of the rolling force of the main roll and the core roll. When this forming method produces thick-walled ring forgings, the flow velocity of the metal material near the inner and outer walls of the ring is higher than that of the metal material in the middle part, and the greater the wall thickness, the greater the difference between the two , if a rectangular ring blank is used for rolling forming, grooves will appear on the upper end surface of the formed thick-walled ring forging, that is, the height of the part near the outer wall and the part near the inner wall is greater than the hei...

AI Technical Summary

Problems solved by technology

The first method will destroy the metal flow line on the end face of the forging, reduce the strength of the ring, and waste materials

Although the second method suppresses the height increase on both sides of the inner wall and the outer wall, it is easy to cause excessive metal materials to flow to the upper ends of the inner wall and the outer wall, where they accumulate and form folds; and if the pressing speed of the cone roller is too high Fast, it will also cause a serious temperature rise on the end face of the forging, which will seriously affect the quality of the forging

Images