A method for integral profiling extrusion of multi-nozzle thin-walled pipelines

Abstract

The invention provides a multi-nozzle integral profiling extrusion method for thin-walled pipelines, comprising the following steps: making a hollow tube blank and a mold, the mold including an upper punch and a lower punch; assembling the hollow tube blank and the mold; controlling the upper punch and the lower punch to extrude the hollow shell, so that the hollow shell forms a forging with a plurality of nozzles; demoulding the forging; The forging is subjected to an elongation operation until the forging reaches a predetermined size to form a thin-walled pipeline. The present invention bidirectionally extrudes the thicker hollow tube blank by the upper punch and the lower punch to form a forging with multiple nozzles, and the forming effect of the nozzle is better; at the same time, the forging is elongated to form a thin wall The pipeline will not damage the overall structure of the thin-walled pipeline.

Description

technical field [0001] The invention relates to the technical field of pipeline forming, in particular to a method for integral profiling and extrusion of a thin-walled pipeline with multiple nozzles. Background technique [0002] In the traditional near-net-shape manufacturing process, for large-scale nuclear power main pipelines with asymmetric nozzles, the forming of the nozzles requires first forging a cylinder with flanges, and then gas cutting or machining to remove the excess nozzles. Remove and finally extrude the nozzle part to form. This method has low material utilization, and in the gas cutting process, the uneven temperature of the billet and the multi-fire forging will bring potential risks to the performance of the forgings. However, if the thin-walled tube blank is directly extruded, it is easy to cause instability, but it is difficult to control the flow direction of the metal after the instability, and it is difficult to fit the nozzle cavity with the nozz...

AI Technical Summary

Problems solved by technology

This method has a low material utilization rate, and in the process of gas cutting, the uneven temperature of the blank and the forging of multiple fires will bring potential risks to the performance of the forging

However, if the thin-walled tube billet is directly extruded, although it is very prone to instability, it is difficult to control the flow direction of the metal after the instability, and it is difficult to fit the nozzle part with the nozzle cavity, and the forming quality of the nozzle is difficult. ensure

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