Rolling forming method of structural steel thick-wall ring forging

Abstract

The invention discloses a rolling forming method of a structural steel thick-wall ring forging. The method comprises the following steps: firstly designing an intermediate billet as a specially-shaped ring billet with a lug boss adjacent to the inner wall; calculating each size of the specially-shaped ring billet according to an equivolumetric principle; designing a special mold according to the shape and size of the specially-shaped ring billet; heating a structural steel bar to reach a deformation temperature, upsetting, perforating and pre-rolling the structural steel bar, and preparing the structural steel bar into a specially-shaped ring billet under the effect of the special mold; reheating the specially-shaped ring billet to reach the deformation temperature, and rolling the specially-shaped ring billet to form a thick-wall ring forging by matching with an appropriate rolling parameter. According to the method, the defects such as grooves, folding and the like in the rolling process of the thick-wall ring forging can be effectively solved, and the rolling quality of the thick-wall ring forging can be improved. The method is used for rolling and forming the thick-wall ring forging.

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 structural 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 ...

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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