风电球墨铸铁行星架铸造工艺研究

Research on Casting Process of a Ductile Iron Planet Carrier for Wind Power Generation

对风电球墨铸铁行星架的铸造工艺进行了系统的研究,并利用Magma数值模拟软件进行了工艺优化。针对行星架的结构特点和技术要求,浇注系统采用底注多内浇道进铁液。在工艺上,将冒口与冷铁相结合,严格控制化学成分,采用多次孕育,选取钇基重稀土球化剂,适当降低浇注温度,可有效改善铸态组织,提高铸件致密度和材质性能。正火时应特别注意冷却方式,以保证珠光体含量,从而提高铸件力学性能。

The casting process of a ductile iron planet carrier for wind power generation was investigated and the numerical simulation software MAGMA-Soft was used for the casting process optimization.According to the structure characteristics and technical requirements of the planet carrier,the bottom gating and multiple ingates system has been selected for the casting process.By combining to use risers and chills,accurately controlling the chemical composition,adopting the multi inoculation and the Y-based heavy rare earth nodulizer and properly lowering the pouring temperature,the as-cast metallographic structure of the planet carrier casting can be modified,and the density and properties of the casting can be improved.Special attention should be paid to the cooling method during the normalizing of the casting to ensure the content of pearlite in the microstructure and improve the mechanical properties of the casting.