Analysis and Optimization of Crown Bubble Defects in Aluminum Piston Casting
Crown bubbles are the main casting defects of piston with casted crown,which is also one of the main causes of engine piston failure.Through the reproduction test of crown bubbles,the influence of aluminum liquid tem-perature,pouring speed,filter mesh structure,and filter position on the defect was investigated.The results indicate that the missing filter or position deviation are the main causes of crown bubbles,which is further verified by simulation analysis.By optimizing the structure of fixation groove in filter,the deviation of filter position is effectively solved and the crown bubbles are eliminated.The casting missing filter was identified by infrared sensor to ensure the timely detec-tion of leakage.
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