Aiming at the loose defects

shrinkage defects and pore defects in the ZL205A medium and large base castings

the initial casting process was analyzed

and the internal quality and mechanical properties of the product were tested.In addition

the reasons for the defects were analyzed.Some key technological measures were put forward

such as opening a channel for discharging slag

increasing pouring temperature

reducing pouring speed

increasing top mounting edge

and using chilling iron

graphite and chromite sand to quench the casting as a whole

those defects were eliminated

and the qualified ZL205A medium and large base casting was produced sucessfully.