日本金属学会誌

J. Japan Inst. Metals, Vol. 69, No. 8 (2005),
pp. 723-726

Pore Defect Control in Die Casting by Compression Loading

Yoshihiko Hangai1, Soichiro Kitahara2 and Shigeyasu Amada1

1Department of Mechanical System Engineering, Faculty of Engineering, Gunma University, Kiryuu 376-8515
2Gundai Co., Ltd., Isesaki 372-0854

Abstract:

Although die casting enables high productivity, pore defects in the die castings are unavoidable. These pore defects influence the mechanical properties or air leakage efficiency of the products. To reduce the number of pore defects, we performed compression tests on front housings of car air conditioners made by aluminum alloy die casting (ADC12) at room temperature. Because of plastic deformation, the porosity of the die castings becomes lower as the compression strain of the specimen becomes higher, particularly in the middle area of the specimen where the porosity is high. However, the efficiency of the reduction of the porosity and damage of the products differs depending on the condition of compression load. Consequently, it is necessary to investigate the condition of the compression load in order to render this method applicable in practice.


(Received 2005/4/25)

Keywords:

die casting, aluminum alloy, pore defect, compression load, plastic deformation


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