Summary
Due to the cyclic nature of the process of semi-continuous hydrostatic extrusion, deformations arise particularly at the die throat affecting the final dimensions and causing localised indentations of the product.
In the present work, a finite element analysis of the die has been compared with a previous solution using the point matching technique. No satisfactory agreement was achieved. Results were also compared with the experimental work previously carried out and good agreement was obtained.
Experimental work carried out by the authors confirmed the effect of changing the seal position on the final dimensions and form of the product. The optimum seal position is the one which gives the minimum local indentation of the product at the die throat on cycling the pressure; this can be predicted from the theoretical analysis.
The analysis can also be used to predict the most highly stressed portion of the die and hence enable the maximum allowable cyclic pressure to be determined.
This is a preview of subscription content, log in via an institution to check access.
Preview
Unable to display preview. Download preview PDF.
References
H. D. Conway (1960). The approximate analysis of certain boundary value problems. J. Appl. Mech. Trans. Am. Soc. Mech. Engrs, 82, 275
I. U. Ojalvo and F. D. Linzer (1965). Improved point matching techniques. J. Mech. Appl Math., XVIII, Pt.I, 41–56
B. M. Irons and O. C. Zienkiewicz (1968). The isoparametric finite element system—a new concept in finite element analysis. Research Report No. C/R/84/68, Civil Eng. Dept., University of Wales, Swansea (March)
G. C. Nayak (1971). Plasticity and large deformation problems by the finite element method. Ph.D. Thesis, Civil Eng. Dept., University College of Swansea
D. J. Naylor (1974). Stresses in nearly incompressible materials by finite elements with application to the calculation of excess pore pressures. Int. J. Numerical Methods in Eng., 8, (3), 443–460
E. Hinton, F. C. Scott and R. E. Ricketts (1975). Local least squares stress smoothing for parabolic isoparametric elements. Int. J. Numerical Methods in Eng., 9 (1), 235
A. W. Duffill, C. J. Hooke and P. B. Mellor (1968). Design of straight conical dies for hydrostatic extrusion. Proc. 9th Int. MTDR Conf., 487–94
A. P. Green. Plane strain theories of drawing. Proc. Inst. Mech. Engrs., 174, 847
A. W. Duffill and P. B. Mellor (1968). A comparison of wire drawing and hydrostatic extrusion through straight conical dies. Proc. 9th Int. MTDR Conf., 247
S. Kamyab (1972). On pressure distribution and frictional conditions in hydrostatic extrusion dies. Ph.D. Thesis, Mech. Eng. Dept., Imperial College
H. Kudo and D. Matsubara. Stress analysis in cylindrical dies of finite length subjected to a band of internal pressure. The Government Mechanical Laboratory, Tokyo, Japan
J. B. Hawkyard and W. Johnson (1967). An analysis of the changes in geometry of a short hollow cylinder during axial compression. Int. J. Mech. Sci., 9, 163–82
Author information
Authors and Affiliations
Editor information
Editors and Affiliations
Copyright information
© 1976 Macmillan Publishers Limited
About this chapter
Cite this chapter
Alexander, J.M., Said, M.E. (1976). The Effect of Seal Position on Stresses and Deformations in Dies for Semi-Continuous Hydrostatic Extrusion. In: Koenigsberger, F., Tobias, S.A. (eds) Proceedings of the Sixteenth International Machine Tool Design and Research Conference. Palgrave, London. https://doi.org/10.1007/978-1-349-81544-9_64
Download citation
DOI: https://doi.org/10.1007/978-1-349-81544-9_64
Publisher Name: Palgrave, London
Print ISBN: 978-1-349-81546-3
Online ISBN: 978-1-349-81544-9
eBook Packages: Palgrave Social & Cultural Studies CollectionSocial Sciences (R0)