Aiming at the defects(Crushed core)of the crankcase ventilation channel of the gravity-cast aluminum alloy cylinder head,the forming causes of the defects and the casting process were analyzed using fishbone diagram analysis method.By optimizing and adjusting the structures of the crankcase ventilation channel sand core(blowby core),the frame core,and the riser core to adjust the fit gap between the cores,and by adding the working position apparatus and an alarm device for the cores setting tooling,the final casting process methods was determined through production verification.These methods fundamentally eliminated the defects(Crushed core)of crankcase ventilation channel in the cylinder head,improved the casting quality,also reduced the scrap rates.
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