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Hydrodynamic modelling of hydrostatic magnesium extrusion
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Abstract:
Wilson’s hydrodynamic model of the hydrostatic extrusion process is extended to meet the geometry found on residual billets The transition from inlet
to work zone of the process is not considered sharp as in the model of Wilson but as a rounded edge, modelled by a parabolic function It is shown that
this rounded edge has a considerable influence on the predicted film thickness Furthermore, it is shown that for hydrostatic extrusion of magnesium with castor oil as pressure medium, it is not possible to generate full film lubrication in the work zone of the hydrostatic extrusion processread more
Citations
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Contact model for hydrostatic extrusion of magnesium
TL;DR: In this paper, the fraction of real area of contact α converges to almost one within 40% of the work zone in the Westeneng contact model, which is suitable for any asperity geometry.
DissertationDOI
Friction phenomena in hydrostatic extrusion of magnesium
TL;DR: In this paper, the surface quality of the hydrostatic extrusion products is determined in the work zone, where the actual deformation takes place, and a lubrication model is developed based on the well-known Reynolds equation.
References
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Journal ArticleDOI
Sheet metal forming of magnesium wrought alloys — formability and process technology
Eckart Doege,K. Dröder +1 more
TL;DR: In this paper, the results of deep drawing tests with magnesium alloys AZ31B, AZ61B, and M1 showed very good formability in a temperature range between 200 and 250°C, and the influence of forming speed on limit drawing ratio has been investigated.
BookDOI
Tribology Data Handbook
TL;DR: In this paper, the authors present an extended version of the Industrial Tribology Data Handbook for the IoT and Big Data, which includes additional information about friction, wear, and erosion.
Journal ArticleDOI
An Isothermal Hydrodynamic Lubrication Theory for Hydrostatic Extrusion and Drawing Processes With Conical Dies
W. R. D. Wilson,J. A. Walowit +1 more
TL;DR: In this article, Snidle et al. carried out a straightforward plastohydrodynamic analysis of the hydrostatic extrusion process under isothermal conditions and obtained an expression for the non-dimensional extrusion pressure in terms of the geometry of the process, the state of augmentation, and the pressure coefficient of viscosity of the lubricant.
Book
Tribology Data Handbook: An Excellent Friction, Lubrication, and Wear Resource
TL;DR: Lubricant Properties Typical Lubricating Oil Properties Comparison of Properties of Synthetic Fluids Polyalphaolefins Organic Esters Polyalkylene Glycols Phosphate Esters Silicones Perfluoroalkylpolyethers Polychlorotrifluoroethylenes Polybutenes Vegetable Oils: Structure and Performance Additives Greases Solid Lubricants Viscosity of Liquids, Aqueous Solutions, and Liquid Metals Gas Properties Typical lubrication Specifications for Equipment Comparison of Viscosynthetic Classifications Military Specifications Air Compressor
Journal ArticleDOI
A hydrodynamjc model of hydrostatic extrusion
TL;DR: In this article, it is shown that, above some critical value of Sommerfeld number, a condition of hydro-dynamic lubrication may exist, and an elementary theory is developed which is consistent with experimental results, the viscosity of typical lubricants and the pressure dependence of viscosities of the lubricant.