Large and medium-sized hollow castings

such as lathe bed castings on machine tool

were produced increasing in EPC

in which processing operation could be simplified greatly with a lower production cost due to the absence of wooden pattern preparation as well as a shorter production cycle.However

there exists casting defects frequently such as downslide

swell

misrun and so on

resulting in rejection

in the production of large and medium-sized hollow casting in EPC.For such castings

the special measures should be considered

including adding exhausting-channel or other mechanism

enlarging pressure head

increasing pressure-iron as well as setting special gating system

which could effectively reduce or decrease casting defects

improving the quality of castings and qualified rate.