Abstract ▼ AI-Helper

Ductile Cast Iron is widely applied to the various industries such as the automobile parts, the heavy equipment parts and the agricultural parts. The solution of the quality problem is necessary as the customer demands is diversified. The study is focused on understanding the casting process and red...

Ductile Cast Iron is widely applied to the various industries such as the automobile parts, the heavy equipment parts and the agricultural parts. The solution of the quality problem is necessary as the customer demands is diversified. The study is focused on understanding the casting process and reducing the quality problem caused by the air bubble defect and the porosity defect of the parts which is made of Ductile Cast Iron. In case of the Forklift housing part, it has many possibilities of the porosity defects which is the main reason for the oil leakage problem and it should degrade the performance of the part. The quality of the casting part typically depends on how to come the molten metal into a mold. In this study, the casting design is made in order to work for the casting process of the casting housing. The mold designs are made based on two cases between Core and No Core. In case of the mold including Core Chill is inserted. The specimen is analyzed by the spectrum analyzer and the tension tester. The specimen organization of graphite is analyzed by the image analysis system and the proportion of Nodular graphite test is able to analyze the results and attain the proportion of Nodular graphite. The specimen organization is magnified a 100 times by The metallurgical microscope. The part of 130mm hight(In case of core, In case of no core) is machined with 3mm after fixing it by a chuck in order to find out a defect. The results of 633.1N/mm2, 639.4N/mm2 are met for the tensile strength standard(471N/mm2) through the several tests for the tensile strength with A type(no core) and B type(core) which are a delicate difference. The proportion of Nodular graphite is the image analysis system and there is difference of the porosity change depending on the shape of A type and B type which are made from the numerical color. The porosity of 5%∼30% occurs the section 15∼18 and the porosity of 2%∼3% occurs the section 32∼34. The propose of the test is for the reduction of the porosity by inserting core into the chill as making the molten metal flow better.

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