Fabrication of Al/Cu Composite Using Multiple Hydrostatic Extrusion Process and Its Material Properties

PRICM ◽  
2013 ◽  
pp. 1401-1407
Author(s):  
TaeHyuk Lee ◽  
YoungJune Lee ◽  
YiHa Kim ◽  
HaGuk Jeong ◽  
JongHyeon Lee
Keyword(s):  
Material Properties ◽  
Extrusion Process ◽  
Hydrostatic Extrusion

A Study on Hydrostatic Extrusion of Al Duo-Casted Billet

2012 ◽  
Vol 630 ◽  
pp. 18-22 ◽  
Author(s):  
Jong Sup Lee ◽  
Yong Bae Kim ◽  
Geun An Lee ◽  
Dong Su Bae ◽  
Jun Pyo Park ◽  
...  
Keyword(s):  
Material Properties ◽  
Hydrostatic Stress ◽  
Extrusion Process ◽  
Optical Microscope ◽  
Al Alloys ◽  
Extrusion Ratio ◽  
Hydrostatic Extrusion

In this study, a Hydro Co-Extrusion Process of Al-Mn/Al-Si hybrid alloys prepared by electromagnetic duo-casting was investigated. Sleeve of the duo-casted billets is 3003 Al-Mn alloy and core is 4004 Al-Si alloy. It is expected hydrostatic stress during the HCE process enhances formability of materials and minimize any defects in extruded billets due to different material properties between two Al alloys. The duo-casted billet was extruded at temperature of 423K and with extrusion ratio of 5. Finally, the effect of the HCE on microstructure of the billet was investigated by an optical microscope.

Investigation of Friction Using Non-Newtonian Lubricant Model in Hydrostatic Extrusion of Tungsten Alloy

2015 ◽  
Vol 813-814 ◽  
pp. 541-549
Author(s):  
Pankaj Tomar
Keyword(s):  
Extrusion Process ◽  
Friction Model ◽  
Hydrostatic Extrusion ◽  
Work Zone ◽  
Tungsten Alloy ◽  
Contact Friction ◽  
Hard Material ◽  
Lubricating Layer ◽  
Lubricant Viscosity

Friction at die/billet interface is a complex phenomenon affected by various operating and process parameters in metal forming industries. In presence of lubricating layer at the interfacial contact friction effect is reduced and enhances tool life and surface quality of product. The lubricant viscosity is strongly dependent on pressure and temperature during deformation of hard material and an accurate prediction of lubricants viscosity leads to realistic results in the work zone. Therefore, the paper incorporates numerical simulation of friction at the die/billet interface in hydrostatic extrusion of tungsten alloy 93W for three different lubricants whose rheology is represented by a Non-Newtonian friction model. The billet heating effect is incorporated in the investigation and results show that the co-efficient of friction varies in a range (0.058 to 0.062) along the work zone for various lubricating conditions in hydrostatic extrusion process.

A Thermal Hydrodynamic Lubrication Theory for Hydrostatic Extrusion of Low Strength Materials

1976 ◽  
Vol 98 (2) ◽  
pp. 335-342 ◽  
Author(s):  
R. W. Snidle ◽  
B. Parsons ◽  
D. Dowson
Keyword(s):  
Plastic Deformation ◽  
Theoretical Analysis ◽  
Thermal Effects ◽  
Hydrodynamic Lubrication ◽  
Extrusion Process ◽  
Lubrication Theory ◽  
Lubricant Film ◽  
Hydrostatic Extrusion ◽  
Solid Friction ◽  
Hydrodynamic Lubrication Theory

The paper presents a theoretical analysis of hydrodynamic lubrication in the hydrostatic extrusion process which includes a consideration of thermal effects in the lubricant film arising from the work of plastic deformation. A Newtonian lubricant with an exponential pressure-temperature-viscosity relationship has been assumed and allowance has been made for the effects of redundant deformation of the worked material. The results of the theory are compared with those from previous isothermal and solid friction theories.

An Elasto-Plasto-Hydrodynamic Lubrication Analysis of the Hydrostatic Extrusion Process

1973 ◽  
Vol 95 (2) ◽  
pp. 113-122 ◽  
Author(s):  
R. W. Snidle ◽  
D. Dowson ◽  
B. Parsons
Keyword(s):  
Plastic Deformation ◽  
Thermal Effects ◽  
Preliminary Analysis ◽  
Hydrodynamic Lubrication ◽  
Numerical Procedure ◽  
Extrusion Process ◽  
Lubricant Film ◽  
Hydrostatic Extrusion ◽  
Small Influence ◽  
Theoretical Results

The authors describe a numerical procedure for the solution of the problem of hydro-dynamic lubrication in the hydrostatic extrusion process. The lubricant is assumed to be a Newtonian fluid and in this preliminary analysis it is assumed that the yield strength of the worked material remains constant. Elastic deformation of the billet as it enters and leaves the die is considered but this effect is found to have only a small influence upon the thickness of the lubricant film which is generated. Thermal effects arising from plastic deformation of the billet and viscous dissipation in the lubricant film are also considered. Theoretical results are presented showing the influence of die angle and reduction ratio upon values of film thickness and extrusion pressure for two materials.

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