An introduction was made to the casting structure and technical requirements of a nodular iron M inlet cylinder,a detail description was made to its casting technology.By help of numeral simulation software,the iron liquid filling mold and solidification situation was analyzed.After casting technology optimization,the castings meeting the technical requirements was successfully produced.Finally,point out:(1)By using unpressured gating system to reduce the entering velocity of ingate to less than 1 m/s,it was possible to reduce casting slag inclusion,and obtain good outer surface quality of casting.(2)By adjusting nodularizing alloy adding amount to control residual Mg content,it was possible relatively better improved the slag inclusion defect of the inlet cylinder.(3)For the M inlet cylinder casting,selecting the upper pouring temperature limit of 1 320～1 340℃ had no obvious influence to shrinkage porosities defects.
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