Roll forming method for stainless steel thick-wall ring forged piece

Abstract

The invention discloses a roll forming method for a stainless steel thick-wall ring forged piece. The roll forming method comprises the steps that a middle blank is firstly designed into a special-shaped ring blank with a boss nearby the inner wall; all dimensions of the special-shaped ring blank are calculated based on the equivolumetric principle; a dedicated mold is designed according to the shape and dimensions of the special-shaped ring blank; after a stainless steel rod is heated to deformation temperature, upsetting, punching and pre-rolling are carried out, the special-shaped ring blank is manufactured under the action of the dedicated mold; the special-shaped ring blank is reheated to the deformation temperature, and is rolled into the thick-wall ring forged piece in cooperation with proper rolling parameters. According to the method, the defects of grooves, folding and the like occurring in the rolling process of the thick-wall ring forged piece can be effectively overcome, and the rolling quality of the thick-wall ring forged piece can be improved. The method is used for roll forming of the thick-wall ring forged 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 stainless steel 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 height of t...

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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