薄壁球墨铸铁小件生产技术

薄壁小件是指壁厚在 4～ 15mm ,模数 <0 .8cm ,质量 <2 0kg ,结构均匀或有孤立热节的铸件。对薄壁球铁小件 ,生产中可以通过控制化学成分 ,球化、孕育工艺 ,防止产生白口及碳化物 ,提高球化级别 ;通过强化浇注系统充填与补缩 ,并配合冷铁、溢流技术防止铸件冷隔、浇不足、气孔、夹渣等充填性缺陷 ,消除铸件热节、浇口根、冒口根的缩孔、缩松等收缩缺陷

Production Process of Thin Section Ductile Iron Castings

Thin section ductile iron casting, whose thickness is from 4 mm to 15 mm,modulus is less than 0.8 cm,weight is less than 20 kg,have well distributed structures and isolated hot spots. On the basis of thin section ductile iron casting, white,carbide have been prevented and controlled by means of chemical composition,techniques of spheroidization and inoculation. Otherwise, defects such as cold shut,misrun,porosity,conclusion have been prevented,meanwhile,defects of the shrinkage and porosity located at the hot spot,root of riser have been eliminated by means of gating and feeding system, techniques of chill and over flow riser.