薄壁壳型件的内压铸造工艺及模具设计

Internal Pressure Casting Technology and Mould Design of Thin Shell Castings

针对某厂家生产的一种薄壁壳型件在铸造过程中容易产生气孔、缩松和裂纹等缺陷,专门设计了一套针对此铸件的铸造工艺及模具。在液体金属充填型腔之前,先将气体沿液态金属填充的方向以超过充填的速度抽空,充型速度为0.5 m/s,结晶时型腔内部压力为5 MPa,保压时间为200 s,浇注温度为(720±10)℃,模具预热温度为250℃。生产实践表明:该铸造工艺及模具结构合理,产品合格率高,极大地减少了气孔和缩松,有效地防止了铸造裂纹的产生。

A set of casting technology and mould of thin shell castings was designed aiming at pores, shrinkage porosities, cracks and other defects in the process of casting. Before the liquid metal filling into the cavity, first evacuating gas along the liquid metal filling direction, the filling speed is 0.5 m/s, the pressure in the inside of cavity is 5 MPa, keeping time is 200 s, pouring temperature is （720±10） ℃, mold preheating temperature is 250 ℃. Production practice shows that the casting technology and mould structure is reasonable, so the products have high quality, the pores and shrinkage porosities reduce greatly, and effectively prevent the casting cracks.