Expendable pattern casting method for manufacturing aerogenerator mainshaft by ductile cast iron

Abstract

The present invention discloses an expendable pattern 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% carbon content in a smelting furnace; after the smelting step, firstly adding 0.2-0.8% by weight of an Inoculin390 pretreating agent according to the weight of the iron liquorin the iron liquid with the temperature 1460+ / -10 DEG C to treat, and then adding 0.25-0.4% by weight of a nucleating agent according to the weight of the ductile cast iron in 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 the iron liquid with the temperature not less than 1400 DEG C into a moulding box with module; forming and solidifying the iron liquid into cast feeding by the liquid metal in the riser head, and using the residual heat of the castto perform a heat treatment. The expendable pattern 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 a production method of a main shaft of a wind power generator, and in particular relates to a lost foam 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 other c...

AI Technical Summary

Problems solved by technology

Although this method solves the problems existing in the traditional sand casting method to a certain extent, if the method of this factory is directly used to prepare the main shaft of the fan, the following problems will occur: First, because the graphite in the gray cast iron used in this method is Flake distribution, flake graphite has a strong splitting ability to the matrix, which is easy to cause stress concentration, resulting in poor strength, low toughness, and high brittleness of the casting. However, the main shaft of the fan requires high strength and good plasticity, so it is prepared with gray cast iron. The performance of the main shaft of the fan can not meet the requirements; secondly, because the cylinder head of the diesel engine and gasoline engine prepared by this method is a small casting, the small casting has a short pouring time, a fast solidification speed, a small amount of gasification and easy process parameters. Therefore, it is easy to obtain castings with less porosity defects and better casting quality

The main shaft of the fan is a large-scale casting. If the same process is used to produce it, due to the long pouring time, slow solidification speed, large amount of gasification and gasification of the pattern, and difficult control of process parameters, the obtained casting has many pores and defects and the quality of the casting is poor; 3. When the lost foam casting is assembling the mold, it is assembled into a mold with the same size as the real object by using several small pieces cut into pieces. If the casting is small, the assembly accuracy is easy to guarantee

However, due to the large castings of the fan main shaft, it is easy to cause large deviations, which will not only affect the quality of the castings, but may also cause the castings to be scrapped; fourth, because the diesel engine and gasoline engine cylinder heads prepared by this method are small castings, in the The top pouring method is used for pouring

If a large part such as the main shaft of the fan is poured by the top pouring method, due to the large amount of poured liquid metal and the strong impact force, on the one hand, the mold wall will be severely washed away; More gas and inclusions are formed, and it is not conducive to the floating and removal of gases and inclusions, which will eventually affect the quality of castings

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