Rolling-extruding composite near-net forming method for large ring piece having outer contour with abrupt-change section

Abstract

The invention discloses a rolling-extruding composite near-net forming method for a large ring piece having an outer contour with an abrupt-change section. The rolling-extruding composite near-net forming method for the large ring piece having the outer contour with the abrupt-change section comprises the following steps: S1, a blank obtained after upsetting and punching is subjected to pre-rolling forming, and a large-diameter ring blank with the rectangular section and uniform wall thickness is obtained; S2, the ring blank subjected to the pre-rolling forming is placed on an extrusion die, the extrusion die comprises a core die with limiting flanges at the two ends and a plurality of petal dies evenly distributed around the axis, the petal dies are provided with multiple stages of extrusion blocks in the axial direction, each stage of extrusion block is controlled by a respective high-pressure push rod to work, multi-direction continuous local incremental radial extrusion is adopted, and the abrupt-change contour of the outer surface of the ring blank is formed step by step in the axial direction, and a special-shaped ring blank is obtained; and S3, the special-shaped ring blank is subjected to radial closed type near-net rolling forming, and the target ring piece is obtained. The method is smaller in forming force, lower in energy consumption, capable of restraining the outer diameter of the ring piece from being increased, high in material utilization rate and capable of greatly improving the comprehensive performance of products.

Description

technical field [0001] The invention belongs to the technical field of plastic processing, and in particular relates to a rolling-extrusion composite near-net forming method for a large-scale ring with sudden change in outer profile. Background technique [0002] The large-scale outer profile sudden change section ring has the geometric characteristics of a straight wall on the inner surface and several sudden steps on the outer surface. It is often used in aviation, aerospace, energy and special carrier equipment. The service environment of this type of ring is complex, changeable and harsh. , so it puts forward extremely high requirements on the overall performance. [0003] Ring rolling is a high-efficiency plastic forming technology for manufacturing high-quality seamless rings. Traditional forging methods are difficult to accurately form large-scale outer contour abrupt cross-section rings. At present, ring rolling is mainly used to form rectangular cross-sections. The...

AI Technical Summary

Problems solved by technology

[0003] Ring rolling is a high-efficiency plastic forming technology for manufacturing high-quality seamless rings. Traditional forging methods are difficult to accurately form large-scale outer contour abrupt cross-section rings. At present, ring rolling is mainly used to form rectangular cross-sections. Rings, and then process sudden steps on the outer surface by cutting. This method not only causes a lot of waste of materials and low processing efficiency, but also destroys the integrity of the metal streamline and weakens the mechanical properties of the rings.

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