Sand-faced metal mould casting method for manufacturing aerogenerator mainshaft by ductile cast iron

Abstract

The present invention discloses a sand-faced metal mould casting method for manufacturing an aerogenerator mainshaft by ductile cast iron. The method includes the steps as follows: smelting the ductile cast iron with 3.4-4.0% by weight percentage of carbon content in a smelting furnace; after the smelting step, firstly adding 0.15-0.75% by weight of an Inoculin390 pretreating agent according to the weight of the iron liquid in the iron liquid with the temperature 1460+ / -10 DEG C to treat, and then adding 0.2-0.4% by weight of a nucleating agent according to the weight of the ductile cast ironin the iron liquid and stirring it completely before the casting step; and then adding 0.2-0.35% by weight of a nodulizing agent according to the weight of the ductile cast iron; at last, casting theiron liquid with the temperature not less than 1400 DEG C in a metal mould by using a downsprue tundish casting open type side casting system; forming and solidifying the iron liquid into cast feedingby the liquid metal in the riser head, and using the residual heat of the cast to perform a heat treatment. The sand-faced metal mould casting method provided by the invention not only can displace the traditional forging technology, but also can mould productions easily, wherein the cast has the advantages of compact structure, good mechanical property and high production efficiency, and the method of the invention can reduce the production cost by more than 40%.

Description

technical field [0001] The invention belongs to the technical field of production methods of a main shaft of a wind power generator, and in particular relates to a sand-covered metal casting method for manufacturing a main shaft of a wind power generator by using nodular cast iron. Background technique [0002] At present, with the increasingly serious problems of global energy shortage and environmental pollution, finding and choosing green, environmentally friendly and renewable energy has become a major issue faced by countries all over the world. Compared with other energy sources, wind energy in nature not only has large reserves, is widely distributed, is never exhausted, and is 10 times that of water energy, but also has the advantages of fast start-up, short construction period, less basic investment than hydropower station construction, and flexibility. Strong, and can effectively curb the greenhouse effect and sandstorm disasters, green environmental protection and...

AI Technical Summary

Problems solved by technology

However, if the method is directly used to prepare the main shaft of the fan, the following problems will occur: First, due to the high requirements for the strength and plasticity of the main shaft of the fan, especially good impact toughness, the comprehensive mechanical properties of ordinary ductile iron are slightly lower than Therefore, if the production method of ordinary nodular cast iron is used directly, the performance requirements of the main shaft of the fan cannot be fully met in terms of performance;

The main shaft of the fan is a large-scale casting. If it is produced by the same process, due to the thicker sand layer and poor air permeability, more air hole defects are prone to appear in the casting, thereby affecting its performance; Diesel engine crankshafts are small castings, and the top pouring method is used for pouring.

However, when pouring large parts with this method, due to the serious erosion of the mold wall and the serious stirring of the liquid metal, more inclusions are easily formed in the casting, and it is not conducive to the floating of inclusions, which affects the quality of the casting.

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