Manufacturing method of high-temperature alloy Nimonic80A order shaft forging forged by radial forging machine

Abstract

The invention discloses a manufacturing method of a high-temperature alloy Nimonic80A order shaft forging forged by a radial forging machine. The purpose of the invention is that a proper hot deformation parameter is selected by a hydraulic-type radial forging machine, so that the order shaft forging with the qualified shape and ideal structure and performance is manufactured by one heat forging, and the manufacturing method is used for manufacturing a valve. The following technical solution is applied to the manufacturing method, namely a Nimonic80A alloy order shaft forging process is that the order shaft is forged and formed in a deformation process such as the following model: cogging with a quick forging press and performing one heat forging and eight-step forging by the radial forging machine; the heating temperature, the final forging temperature and the deformation process are designed and precisely controlled. The beneficial effect of the manufacturing method is that the order shaft is manufactured by the following model: cogging with a quick forging press and performing one heat forging and eight-step forging by the radial forging machine; the outline, size and allowable deviation of the order shaft forging meets the size marking of the drawing; tensile property, hardness and impact at ambient temperature and high temperature are qualified through once inspection; the grain size from the centre to the edge is less than 5 levels through high-magnification inspection, the level different is one, and the grain texture is uniform.

Description

technical field [0001] The invention belongs to the field of metal material manufacturing, and discloses a method for manufacturing a high-temperature alloy stepped shaft forging made by a hydraulic radial forging machine, which is mainly used for the production of a high-temperature alloy Nimonic80A forging. Background technique [0002] Nimonic80A alloy is widely used in aviation, ship valves, steam turbines and other fields. This alloy is used in a large amount in ship engine valve parts. Only South Korea purchases more than 1,000 tons in the world a year. However, in the past, metallurgical The factory provides forged or rolled straight rods, and the valve factory uses subsection upsetting or welding to manufacture valve parts. Segmented upsetting method: the first step is upsetting, through local induction heating, local upsetting, and then solution softening treatment; the second step upsetting is heated by the end of the resistance wire furnace, and upsetting is perfo...

AI Technical Summary

Problems solved by technology

Segmented upsetting method: the first step is upsetting, through local induction heating, local upsetting, and then solution softening treatment; the second step upsetting is heated by the end of the resistance wire furnace, and upsetting is performed by a hydraulic press. The manufacturing process of this process is complicated , the production efficiency is low, the temperature of the connection is low due to local heating, the degree of transverse tensile deformation is large, and cracks are easily generated

Welding method: the bonnet and the valve stem are connected together by welding process, the process is simple, but the quality of the weld cannot be guaranteed

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