Shot Sleeve Wave Dynamics in the Slow Phase of Die Casting Injection

Journal of Fluids Engineering, Transactions of the ASME - Tập 122 Số 2 - Trang 349-356 - 2000
J. Lo ́pez1, J. Herna ́ndez2, F. Faura1, G. Trápaga3
1E.T.S. de Ingenieros Industriales, Universidad Polite´cnica de Cartagena, 30203 Cartagena, Spain
2E.T.S. de Ingenieros Industriales, UNED, Ciudad Universitaria, 28040 Madrid, Spain
3Department of Materials Science and Engineering Massachusetts Institute of Technology Cambridge MA 02139

Tóm tắt

An analysis is carried out on the wave formed during the slow phase of die casting injection processes. Viscous effects are assumed to be negligible and the problem is treated two-dimensionally using finite amplitude wave theory. Two commonly used types of plunger movements are considered, for which all the possible wave profiles are analyzed in depth as a function of the parameters which characterize the law of acceleration applied to the plunger, the initial shot sleeve filling fraction, and the geometrical characteristics of the problem. Different relationships between the relevant dimensionless parameters of the system are proposed, which make it possible to optimize the injection process, and so reduce the entrapment of air which leads to porosity. The validity of such relationships is analyzed in detail for different ranges of parameters. Some of the results obtained for the optimum acceleration are compared with those of other authors and experimental measurements. Finally, a law of plunger acceleration which would completely eliminate the air from the shot sleeve at the end of the slow phase of injection and minimizes the filling time is derived. [S0098-2202(00)02002-2]

Từ khóa


Tài liệu tham khảo

Campbell, J., 1991, Castings, Butterworth-Heinemann, Oxford.

Garber, L. W. , 1982, “Theoretical Analysis and Experimental Observation of Air Entrapment During Cold Chamber Filling,” Die Cast. Eng., 26, May–June pp. 14–22.

Karni, Y., 1991, “Selection of Process Variables for Die Casting,” Ph.D. thesis, The Ohio State University, Ohio, USA.

Tszeng, T. C., and Chu, Y. L., 1994, “A Study of Wave Formation in Shot Sleeve of a Die Casting Machine,” ASME J. Eng. Ind., 116, No. 2, pp. 175–182.

Thome, M. C., and Brevick, J. R., 1993, “Modeling Fluid Flow in Horizontal Cold Chamber Die Casting Shot Sleeves,” AFS Trans., 101, pp. 343–348.

Brevick, J. R., Armentrout, D. J., and Chu, Y., 1994, “Minimization of Entrained Gas Porosity in Aluminum Horizontal Cold Chamber Die Casting,” Trans. NAMRI/SME, 22, pp. 41–46.

Duran, M., Karni, Y., Br˙evick, J., Chu, Y., and Altan, T., 1991, “Minimization of Air Entrapment in the Shot Sleeve of a Die Casting Machine to Reduce Porosity,” Technical Report ERC/NSM-C-91-31, The Ohio State University.

Lamb, H., 1945, Hydrodynamics, Dover, New York.

Landau, L. D., and Lifshitz, E. M., 1959, Fluid Mechanics, Pergamon Press, Oxford.

Herna´ndez, J., Lo´pez, J., Go´mez P., and Faura, F., 1999, “Influence of Non-Hydrostatic and Viscous Effects on Shot Sleeve Wave Dynamics in Die Casting Injection,” ASME/JSME Fluids Engineering Conference. Forum on Advances in Free Surface and Interface Fluids Dynamics, FED-Vol. 248, San Francisco, CA.

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Thông tin xuất bản

Journal of Fluids Engineering, Transactions of the ASME

Tập 122 Số 2

349-356

Thông tin tác giả