Analysis and Process Measures for Sink of Grey Cast Iron Crankcase
In order to solve the problems of sink defects in thick parts of SC10E series crankcase,methods such as chilling casting defect location,reducing the influence of return charge on the sink tendency of casting,changing inoculant,and so on were adopted.Specific measures include that install chromite sand cores on the tops of the defect locations;modify furnace charge ingredient ratio,namely new pig iron∶return charge∶steel scrap=2∶4∶5∶3.5 before modification and new pig iron∶return charge∶steel scrap=2∶0∶8;replace RECaBa inoculant with Si75Sr1.5 inoculant.After the implementation of the measures,the sink defect rate of this product is greatly reduced,and the problem of high casting scrap rate of this product is completely solved.
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