Near-net composite rolling forming method for large outer contour abrupt change section ring piece

Abstract

The invention discloses a near-net composite rolling forming method for a large outer contour abrupt change section ring piece, which comprises the following steps of: according to the size and shape of a target annular forge piece, segmentation treatment is carried out on the target annular forge piece, and the size of a special-shaped ring blank as an intermediate product is determined; then, the size of the initial rectangular-section ring blank is determined, after the initial rectangular-section ring blank is machined, a female die is installed on the outer side of the initial rectangular-section ring blank, a core die is installed on the inner side of the initial rectangular-section ring blank, and continuous local radial extrusion is conducted on the rectangular-section ring blank to obtain the intermediate product special-shaped ring blank; and the intermediate product special-shaped ring blank is subjected to near-net composite rolling, during near-net composite rolling, a main roller, an auxiliary roller and a guide roller are installed on the outer side of the intermediate product special-shaped ring blank, and a core roller is installed in the intermediate product special-shaped ring blank. According to the near-net composite rolling forming method for the large outer contour abrupt change section ring piece provided by the invention, the size precision is high, the material utilization rate is high, the later machining cost is greatly reduced, and meanwhile the mechanical property of a product is greatly improved.

Description

technical field [0001] The invention relates to the technical field of rolling methods, in particular to a near-net composite rolling forming method for large-scale rings with sudden changes in outer contour. Background technique [0002] The large-scale outer contour sudden change section ring refers to a ring member with a diameter of more than one meter, a straight wall on the inner surface, and a plurality of abrupt deep groove steps on the outer surface. Such rings are widely used in the key components of major equipment in the fields of aerospace, petrochemical and ships, and have high requirements for the comprehensive performance of products. Ring rolling is an advanced special manufacturing technology with high efficiency, high quality, low consumables, and low energy consumption. It is a process method for producing high-quality seamless rings through continuous plastic deformation of billets. However, the volume distribution of the ring billet needs to be reasona...

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Problems solved by technology

Although this method can produce such components, it also causes a lot of waste of raw materials and reduces processing efficiency; moreover, machining destroys the integrity of the original metal streamline of the component and weakens the mechanical properties of the ring.

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