Roll-forming method of GH4648 high temperature alloy complex deformed section ring unit

Abstract

The invention discloses a roll-forming method of a GH4648 high temperature alloy complex deformed section ring unit. The method is used for rolling of complex deformed section ring units which are complete in appearance, high in accuracy of size, excellent in structure and performance, and distributed along the outline of a part. According to the technical scheme, GH4648 high temperature alloy bars blanked by specification are heated and then treated with jumping-up, punching and twice small deformation ring rolling to form rectangular pre-rolled compact, heated rectangular pre-rolled compact is rolled in a pre-rolled section groove by a pre-rolled inner pattern module and a pre-rolled outer pattern module to form deformed pre-rolled compact which is in a structural shape contrary to that of the finally rolled deformed section ring unit, and heated deformed pre-rolled compact is rolled in a finally rolled section groove by a finally rolled inner pattern module and a finally rolled outer pattern module to form the deformed section ring unit. During the rolling, the deformed pre-rolled compact widens along the radial direction in the finally rolled section groove and metal inside flows from places with more metal to places with less metal according to a predetermined volume flow rate. The ring unit is mainly used for revolving body components like a cylindrical shell used in fields like aerospace.

Description

technical field [0001] The invention relates to a rolling forming method of a ring piece, in particular to a rolling forming method of a GH4648 superalloy complex special-shaped section ring piece. Background technique [0002] With the rapid development of industries such as aviation, aerospace, ships, nuclear energy, gas turbines, and wind power generation, higher requirements are placed on the forming dimensional accuracy, structure and performance of ring parts, and the rolling technology of ring parts is also moving towards With the development in the direction of near-net shape, the cross-sectional shape of rolled-formed ring parts is becoming more and more complex, and the difficulty of roll-forming is becoming more and more difficult. How to obtain ring parts distributed along the shape of parts is the premise of precision roll-forming. [0003] The Chinese invention patent specification CN 101279346A published on October 8, 2008 discloses a rolling forming method of...

AI Technical Summary

Problems solved by technology

Since this method adopts the rectangular pre-rolled billet to be directly rolled into special-shaped ring parts, it can only roll and form simple-shaped special-shaped cross-section ring parts under normal circumstances; if this method is used to roll complex-shaped special-shaped cross-section ring parts When the groove surface also has a convex table surface with a complex cross-section GH4648 superalloy ring, due to the complex metal flow of the rectangular pre-rolled billet in the rolling pass during the rolling process, the interaction between the rectangular pre-rolled billet and the rolling pass The interface conditions are complex, and the rolling process has obvious nonlinear, time-varying, and unsteady characteristics, resulting in the rolling and forming of special-shaped cross-section rings that are prone to defects such as insufficient cross-section contours, folds on the outer surface, and fish scales on the end surface. Affects the dimensional accuracy and structural properties of the final rolled ring parts, and in severe cases, it can also lead to the scrapping of the ring parts, which is not conducive to the realization of precision rolling forming of special-shaped cross-section ring parts

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