Electric smelting forming method of ultra-supercritical low-pressure rotor

Abstract

The invention provides an electric smelting forming method of an ultra-supercritical low-pressure rotor. The method is efficient and low in cost and has the good mechanical property. An electric smelting head and a base material are connected to two electrodes of a power source; in the forming process, a metal raw material wire is conveyed to the surface of the base material through a conveying mechanism and the electric smelting head; under the accumulation protection of granular auxiliary materials, an electric arc is generated between the raw material wire and the base material, and the auxiliary materials are molten to form a melting slag pool; under the composite high-energy heat source effect of the electric arc heat, resistance heat and electric slag heat, the raw material wire is molten, and the raw material wire and the auxiliary materials are continuously conveyed; according to layered slicing data of a forming component, relative moving of the electric smelting head and the base material is controlled, and rapid cooling and layer-by-layer solidification and accumulation of the smelting pool on the base material are achieved; layer-by-layer accumulation is carried out to form a rotor component, and the ultra-supercritical low-pressure rotor is made of 3.5 percent NiCrMoV materials; and the content of C of the metal raw material wire used by an electric smelting device ranges from 0.20 percent to 0.30 percent, the content of C of the materials manufactured through electric smelting ranges from 0.10 percent to 0.18 percent, and the grain size ranges from 7 levels to 10 levels.

Description

technical field [0001] The invention relates to an electrofusion forming method for an ultra-supercritical low-pressure rotor. Background technique [0002] Ultra-supercritical power generation technology is a realistic and effective way to solve the current problems of power shortage, low energy utilization rate and serious environmental pollution in our country. Therefore, in the Twelfth Five-Year Plan, it was clearly proposed by the country as the main development direction of clean coal power generation technology. The country's major heavy-duty casting and forging enterprises such as No. Component development work. [0003] The material selected for the ultra-supercritical low-pressure rotor is 3.5% NiCrMoV, which is made by casting and forging. Compared with the high temperature and high pressure environment requirements of high and medium pressure rotors, the difficulty in preparing low pressure rotors is mainly based on the consideration of power generation efficie...

AI Technical Summary

Problems solved by technology

Due to the size and tonnage of low-pressure rotors and the level of casting and forging technology in my country, chemical segregation, uneven structure, and even cracks are prone to occur during rotor casting and forging and heat treatment operations; on the other hand, low-pressure rotors are developed through traditional casting and forging processes The complexity of the steel process itself (including the research and development of rotor steel materials, the research and development of pure steel smelting, the research and development of forging technology, the research and development of heat treatment technology, etc.) also makes it difficult to control the stability, the quality level is poor, and the scrap rate is high

At present, my country does not have a mature process for ultra-supercritical low-pressure rotor materials, and cannot achieve stable batch production. The required rotor materials mainly rely on imports from Japan, Germany and other countries.

As a result, the price remains high, seriously affecting the progress of project construction, and also restricting the development of my country's heavy equipment manufacturing industry

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