Wind-power equipment casting and manufacturing method thereof

Abstract

The invention relates to the technical field of manufacturing of wind-power generating equipment, in particular to a wind-power equipment casting and a manufacturing method thereof. The wind-power generating casting comprises the following chemical components in percentage by mass: 3.60-3.80 percent of C, 2.2-2.4 percent of Si, less than 0.25 percent of Mn, 0.006-0.015 percent of K, 0.006-0.015 percent of Na, 0.008-0.015 percent of Bi, 0.015-0.028 percent of Sb, 0.002-0.004 percent of Sr, 0.035-0.055 percent of Ba, 0.035-0.055 percent of Ca, 0.030-0.050 percent of Al, 0.032-0.055 percent of Mg, less than 0.03 percent of P, less than 0.01 percent of S and the balance of Fe. In the method, an electric furnace is adopted for smelting, and low-manganese waste steel and graphite are added instead of cast iron, supplementary iron and carbon for serving as major raw materials; for further improving the performance of the wind-power casting, a small quantity of micro-alloy elements such as bismuth, antimony, potassium, sodium, strontium, calcium, barium, aluminum and the like are added, so that the graphite is refined, the spheroidizing effect of the graphite is improved, and the effect of preventing degraded spheroidization is achieved; spheroidizing treatment with pure magnesium is performed; and inoculation treatment is performed by using a ferrite spheroidal graphite cast iron inoculant before casting. The wind-power equipment casting has the advantages of simple and convenient production process, low cost, high intensity and high toughness at room temperature and low temperature.

Description

technical field [0001] The invention relates to the technical field of wind power generation equipment manufacturing, in particular to a wind power equipment casting and a preparation method thereof. Background technique [0002] Wind energy is the most promising renewable energy except hydropower. The use of wind power can provide clean energy without producing greenhouse gases. At present, large-scale MW-level wind turbines have entered the stage of mass production, and the main models are 1~3MW wind turbines. Wind power castings for large-scale wind turbines mainly include hubs, bases (cabin seats), bearing housings, gearbox boxes, etc. Casting materials such as hubs and bases (cabin seats) are generally made of ductile iron at home and abroad. Since wind power equipment is erected and operated at a high place, it is not convenient for frequent maintenance. The maintenance period determined during equipment design is usually 20 years, or even 30 years. Therefore, there ...

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Problems solved by technology

[0005] However, the large-scale wind power castings manufactured by the above-mentioned disclosed technology still have low low-temperature impact toughness and poor safety in use. This is related to the poor quality of domestic pig iron and the large number of harmful elements in domestic pig iron.

In order to ensure the performance of wind power castings, imported pig iron is generally used in the production of domestic wind power castings, especially for wind power castings exported abroad, most of them use imported pig iron. Although imported pig iron has few impurities, its price is high, which leads to the production cost of wind power castings increase, business efficiency declines

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