Rolling molding method for nickel-based high-temperature alloy thick-wall ring forge piece

Abstract

The invention discloses a rolling molding method for a nickel-based high-temperature alloy thick-wall ring forge piece. The method comprises the steps that an intermediate billet is designed to be a special-shaped ring billet with a boss in the position close to the inner wall; each size of the special-shaped ring billet is worked out according to the equivolumetric principle; a special mold is designed according to the shape and sizes of the special-shaped ring billet; after a nickel-based high-temperature alloy bar is heated to the deformation temperature, the special-shaped ring billet is prepared under action of the special mold through upsetting, punching and pre-rolling; and the special-shaped ring billet is heated again to the deformation temperature and is rolled to be the thick-wall ring forge piece through proper rolling parameters. By means of the method, the defects of grooves, folding and the like in the rolling process of the thick-wall ring forge piece can be effectively overcome, and the rolling quality of the thick-wall ring forge piece is improved. The method is used for rolling molding of the thick-wall ring forge piece.

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-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

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