Cause Analysis and Improvement Measures of Porosity Defects in 2.5L Diesel Engine Cylinder Castings
In the process verification and small batch production stage of 2.5 L diesel engine cylinder block castings,the pores in the water jacket part are the most prominent casting defects,which are mainly caused by the ineffective gas discharge from the water jacket sand core and the low liquid iron temperature at the isolated high point of the water jacket structure.By adding internal runners to optimize the pouring system,setting exhaust channel circuits to increase the exhaust of the water jacket sand core,and increasing the pouring temperature,the problem of porosity defects in the water jacket has been effectively solved.After production verification,the proportion of defective waste products of pump holes has decreased significantly,from about 11%to about 0.6%.
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