Roll-extrusion combined near-net-shaping method for rings with sudden changes in outer contour

Abstract

The invention discloses a method for rolling, extruding and compounding near-net forming of a large-scale outer contour sudden cross-section ring, comprising the steps of: S1. Pre-rolling the blank after upsetting and punching to obtain a ring blank with a uniform wall thickness and a large-diameter rectangular cross-section ; S2, place the pre-rolled ring blank on the extrusion die. The extrusion die includes a core die with limit flanges at both ends and a number of lobe dies evenly distributed around the axis, and the lobe dies are set along the axial direction. There are multiple stages of extrusion blocks, and each stage of extrusion blocks is controlled by its own high-pressure push rod. Multi-directional continuous local incremental radial extrusion is used to form the abrupt contour of the outer surface of the ring blank step by step along the axial direction to obtain special shapes. Ring blank; S3. The target ring is obtained by forming the special-shaped ring blank through radial closed near net rolling. The method has smaller forming force and lower energy consumption, can restrain the outer diameter of the ring from growing, has high material utilization rate, and greatly improves the comprehensive performance of the product.

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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