Abstract
The density of vacuum counter-pressure cast aluminum alloy samples under grade-pressuring condition was studied. The effect of grade pressure difference and time on the density of aluminum alloys was discussed, and the solidification feeding model under grade-pressuring condition was established. The results indicate the grade-pressured solidification feeding ability of vacuum counter-pressure casting mainly depends on grade pressure difference and time. With the increase of grade pressure difference, the density of all the aluminum alloy samples increases, and the trend of change in density from the pouring gate to the top location is first decreasing gradually and then increasing. In addition, in obtaining the maximum density, the optimal grade-pressuring time is different for samples with different wall thicknesses, and the solidification time when the solid volume fraction of aluminum alloy reaches about 0.65 appears to be the optimal beginning time for grade-pressuring.
Article PDF
Similar content being viewed by others
Avoid common mistakes on your manuscript.
References
Yan Qingsong, Yu Huan, Wei Bokang, et al. Microstructure and properties of vacuum counter-pressure cast aluminum alloy. China Foundry, 2006, 3(2): 113–116.
Yan Qingsong, Cai Qizhou, Wei Bokang, Y et al. Simulation of fuzzy control systems for nonferrous alloy vacuum counter-pressure casting. Transactions of Nonferrous Metals Society of China, 2005, 15(4): 873–877.
Yu Huan, Xiong Bowen, Yan Qingsong. Effects of gating system on the flow behaviors during vacuum counter-pressure casting thin wall aluminum alloy. Advanced Materials Research, 2010, 129-131:189–193.
Yan Qingsong. Process and theory of vacuum counter-pressure casting thin-wall aluminum alloy Castings based on intelligent control. Dissertion, Huazhong University of Science and Technology, Wuhan, 2006. (In Chinese)
Dong Xuanpu, Huang Naiyu, Fan Zitian. Study on filling mold of metallic liquid in vacuum differential pressure casting. Hot Working Technology, 2003(5): 15–17. (In Chinese)
Yan Qingsong, Yu Huan, Lu Gang, et al. Effect of crystallization pressure on secondary dendrite arm spacing of vacuum counter-pressure casting aluminum alloy. The Chinese Journal of Nonferrous Metals, 2014, 24(5): 1194–1199. (In Chinese)
Akad AT. Counter-pressure casting: The processes which occur during casting and crystallization. Foundry Trade Journal, 1989, 21(10): 744–750.
Kovacheva R, Bachvarov G, Dafinova R. Influence of the Counter Pressure Casting Conditions on the Microstructural Characteristics of AISi7Mg Castings. Journal of Materials Science and Technology, 1996, 12(1): 42–56.
Dong Xiuqi, Wang Dong. Theory and practice of low pressure casting and counter-pressure casting. Beijing: China Machine Press, 2003. (In Chinese)
Yan Qingsong, Yu Huan, Wei Bokang, et al. Solidification feeding behavior and model of vacuum counter-pressure casting technology. The Chinese Journal of Nonferrous Metals, 2008, 18(6): 1051–1057. (In Chinese)
Yan Qingsong, Yu Huan, Xu Zhifeng, et al. Effect of holding pressure on the microstructure of vacuum counter-pressure casting aluminum alloy. Journal of Alloys and Compounds, 2010, 501:352–357.
Yu Huan, Yu Zirong, Yan Qingsong, et al. Grade-pressuring filling and solidification process of vacuum counter-pressure casting. China Patent, 200910186024.X, 2009.
Xiong Bowen, Lin Xin, Wang Zhenjun, et al. Microstructures and mechanical properties of vacuum counter-pressure casting A357 alloys solidified under grade-pressurising: effects of melt temperature. Materials Science & Engineering A, 2014, 611: 9–14.
Davies V. Feeding range determination by numerically computed heat distribution. International Journal of Cast Metals Research, 1975, 11(2): 33–4.
Li Xinlei. Study on the large scale counter-gravity casting equipment and its control technology. Dissertion, Northwestern Polytechnical University, Xi’an, 2004. (In Chinese)
Bower T F, Brody H D, Flemings M C. Measurements of solute redistribution in dendritic solidification. Transaction of the Metallurgical Society of AIME, 1966, 236: 624–633.
Pedersen K M, Tiedje N. Temperature measurement during solidification of thin wall Iron. Part 2: Numerical simulations. Measurement, 2008, 41: 341–348.
Kubo K, Pehlke R. Mathematical modeling of porosity formation in solidification. Metallurgical Transactions B, 1985, 16B: 359–363.
Kovacheva R, Bachvarov G, Dafinova R. Influence of the Counter Pressure Casting Conditions on the Microstructural Characteristics of AISi7Mg Castings. Journal of Materials Science and Technology, 1996, 12(1): 42–56.
Author information
Authors and Affiliations
Corresponding author
Additional information
Male, born in 1973, Ph.D., Professor. Research interest: precision forming technology of metals.
This research was financially supported by the National Natural Science Foundation of China (No. 51261025).
Rights and permissions
About this article
Cite this article
Yan, Qs., Yu, H., Lu, G. et al. Density and solidification feeding model of vacuum counter-pressure cast aluminum alloy under grade-pressuring conditions. China Foundry 13, 133–138 (2016). https://doi.org/10.1007/s41230-016-5103-1
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s41230-016-5103-1