Iron pretreatment purpose and pouring process for wind power castings

- Dec 12, 2018 -

Wind power castings, which are also one of the castings, are mainly used in wind power plants and in the wind power industry. Therefore, it is necessary to carry out the familiarity and understanding of this kind of casting, so as to know what it is and how to use it correctly and rationally, and then realize the full utilization of the product.

 

1. Will wind power castings be used in small wind turbines?

In small wind turbines, wind power castings are used and will be used more because it is an important part of the unit. In the price of this type of wind turbine, there are different prices from ordinary wind turbines, but the basic purchase considerations are the same, all need to take into account the origin, parameters, quality, price, manufacturer And the six factors of product after-sales service.

 

2. Why do wind power castings have higher requirements in manufacturing?

With the rapid development of wind power, its demand is increasing. Large parts used in wind power generation, such as hubs and bases, are usually cast with cast iron as a large casting. The wall thickness is thick and the weight is large. Good comprehensive mechanical properties and strict requirements on the production process. Therefore, higher requirements have been put forward on raw material quality, process control and overall process route in order to meet different requirements in the manufacture of wind power castings.

 

3. Why should the iron liquid be pretreated during the casting process of wind power castings?

In the casting process of wind power castings, the pretreatment of the molten iron is to use a suitable pretreatment agent to improve the intrinsic quality of the molten iron and form a stable nucleation point before the spheroidizing operation, which can create favorable conditions for further spheroidization reaction. . In addition, pretreatment can bring some benefits, which are: improve the anti-recession ability of the casting, increase the absorption rate of Mg, increase the number of graphite pellets per unit area, increase the spheroidization rate, reduce shrinkage and eliminate Shrink, purify the iron and remove the inclusions in the molten iron to facilitate the removal of debris.

 

4. Casting process of wind power castings

The casting process of wind power castings is generally carried out by using two ladle. The pouring requires a high flow rate rapid pouring, and the pouring time and pouring temperature are appropriate. In addition, the casting should be heat-insulated in the mold to slowly cool it and improve the plasticity of the casting. Moreover, if the casting is slowly cooled, it is equivalent to one heat treatment, so that the residual stress is effectively eliminated. The mechanical properties, metallographic structure and intrinsic quality of the castings can meet the technical requirements and provide the necessary parameters for the mold design.www.xihuafoundry.com