Rolling forming method of constructional steel complex special-shaped section ring-type element

Abstract

The invention discloses a rolling forming method of a constructional steel special-shaped section ring element and aims to roll a complex special-shaped section ring-type element which is complete in appearance, high in size accuracy and good in structure and performance, and is distributed along the external shape of the element. The technical scheme is that after being heated, constructional steel bar materials which are discharged according to specifications are formed into a rectangular pre-rolling semi-finished product through upsetting, punching and looping rolling; after being heated, the rectangular pre-rolling semi-finished product is rolled into a special-shaped pre-rolling semi-finished product by a pre-rolling inner forming module and a pre-rolling outer forming module in a pre-rolling special-shaped hole pattern, wherein the shape of the special-shaped pre-rolling semi-finished products are opposite to that of a finished rolling special-shaped section ring element; after being heated, the special-shaped pre-rolling semi-finished product is rolled into a special-shaped section ring element by a finished inner forming module and a finished rolling outer forming module, in the rolling process, the special-shaped pre-rolling semi-finished product widens along a radial direction in the finished rolling groove, and the metal inside the special-shaped pre-rolling semi-finished product flows from a place with more metal to a place with less metal according to preset volume flow rates. The ring element is mainly used for barrel-type revolved bodies of an aviation aircraft.

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 ring piece with complex special-shaped cross-section of structural steel. 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 101279343A published on October 8, 2008 discloses a rolling form...

AI Technical Summary

Problems solved by technology

Since this method adopts the rectangular pre-rolled billet to directly roll 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 of the complex special-shaped cross-section structural steel ring, due to the complex metal flow of the rectangular pre-rolled billet in the rolling pass during the rolling process, the interaction interface between the rectangular pre-rolled billet and the rolling pass The situation is complicated, and the rolling process has obvious nonlinear, time-varying, and unsteady characteristics. As a result, the special-shaped cross-section rings formed by rolling are prone to defects such as insufficient cross-section profile, folds on the outer surface, and scales on the end surface, which affect The dimensional accuracy and structural properties of the final rolled ring parts may lead to the scrapping of the ring parts in severe cases, which is not conducive to the precision rolling forming of special-shaped cross-section ring parts

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