Produltion Technology of As-cast Large-Scale High Strength Nodular Cast Iron
The eccentric gear material is QT700-2,its mass is 2853kg,its hardness is 230HB,and the biggest wall thickness is 218 rmm,but if castings do no heat treatment,it is difficult to meet the requirements of the products.By lowering the original iron liquid silicon content,adopting the long-term nucleating agent increased inoculation quantity and reasonable control unpacking time,the quality of the products were ensured.The castings surface temperatures were measured by using hand-held sand temperature measuring equipment.The sand temperatures after pouring control at 660-700 ℃,and unpacking time controls for 10.5 h,the castings after unpacking remove the surface sand.The castings produced by this process,do not need the heat treatment,which cna save the cost of production.
NETL
NSTL
万方数据
维普
