Effect of Vacuum Degree on Pinhole of Vacuum Counter-Pressure Casting Molten Aluminum Alloy

Abstract:

During vacuum counter-pressure casting, the vacuumization is an important stage for thin-wall and complicated aluminum alloy castings. Through testing and an analyzing numbers of pinhole and pinhole grade of aluminum alloy samples under different vacuum degree, the effect of vacuum degree on pinhole of vacuum counter- pressure casting molten aluminum alloy is studied. The results indicate vacuum degree has greater effect on pinhole of molten aluminum alloy in vacuumizing process. The smaller vacuum degree is, the more numbers of pinhole of the samples are, and the higher pinhole grade of the samples is. Therefore, when vacuum degree is small, pinhole of molten aluminum alloy appears easily. So the vacuum degree doesn’t choose too small, but for thin-wall and complicated aluminum alloy castings, the vacuum degree doesn’t choose too big either. Appropriate vacuum degree is from 20 KPa to 40 KPa.

• Periodical: Applied Mechanics and Materials (Volumes 278-280)
• Pages: 381-384
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.278-280.381
• Online since: January 2013
• Authors: Qing Song Yan, Zi Peng Tu, Gang Lu, Bai Ping Lu, Chang Chun Cai, Shou Yin Zhang
• Keywords: Molten Aluminum Alloy, Pinhole, Vacuum Counter-Pressure Casting, Vacuum Degree

References

[1] Huan Yu, Bowen Xiong, Qingsong Yan, Zhifeng Xu, Changchun Cai: Advanced Materials Research Vol. 129-131(2010), p.189.

[2] E. Momchilov: Journal of Materials Science and Technology Vol. 2 (1994), p.3.

[3] Xuanpu Dong, Naiyu Huang, Shusen Wu: Foundry Vol. 51 (2002), p.415 (In Chinese).

[4] Qingsong Yan, Huan Yu, Zhifeng Xu, Bowen Xiong, Changchun Cai: Journal of Alloys and Compounds Vol. 501 (2010), p.352.

[5] Qingsong Yan, Huan Yu, Bokang Wei, Zhifeng Xu, Changchun Cai: The Chinese Journal of Nonferrous Metals Vol. 18 (2008), p.1051 (In Chinese).

[6] G.D. Chandley: Material Reseacher Innovate Vol. 31 (1999), p.14.

[7] Xuanpu Dong, Naiyu Huang, Zitang Fan: Hot Working Technology Vol. 5 (2003), p.15 (In Chinese).

[8] L. Siaminwe, A. J. Clegg: Material Science and Technology Vol. 15 (1999), p.812.

[9] C.H. Caceres, C.J. Davidson, J.R. Griffiths: Metallurgic Materials Transactions A Vol. 30A (1999), p.2611.

[10] Shoupeng Wang: castings forming theory and technology basis, first ed., Northwestern Polytechnical University Press, Xi'an, 1994 (In Chinese).