Integral Hot Gas Pressure Forming of an AA2219 Aluminum Alloy Ellipsoidal Shell

JOM ◽  
2017 ◽  
Vol 69 (4) ◽  
pp. 742-747
Author(s):  
S. J. Yuan ◽  
R. Zhang ◽  
W. W. Zhang
Keyword(s):  
Aluminum Alloy ◽  
Gas Pressure ◽  
Ellipsoidal Shell ◽  
Hot Gas ◽  
Aa2219 Aluminum Alloy

A Time-Dependent Material Model for the Simulation of Hot Gas-Pressure Forming of Magnesium Alloy AZ31

2012 ◽  
Vol 735 ◽  
pp. 198-203 ◽  
Author(s):  
Alexander J. Carpenter ◽  
Eric M. Taleff ◽  
Louis G. Hector ◽  
Jon T. Carter ◽  
Paul E. Krajewski
Keyword(s):  
Experimental Data ◽  
Sheet Material ◽  
Material Model ◽  
Gas Pressure ◽  
Time Dependent ◽  
Dome Height ◽  
Fem Simulations ◽  
Hot Gas ◽  
Magnesium Alloy Az31 ◽  
Az31 Sheet

A time-dependent material constitutive model is developed for the deformation of wrought Mg AZ31 sheet material at 450°C. This material model is used to simulate gas-pressure bulge forming of AZ31 sheet into hemispherical domes. Finite-element-method (FEM) simulations using this material model are compared against experimental data obtained for dome height as a function of forming time under forming conditions identical to those assumed in the simulations. The time-dependent material model predicts experimental dome heights during forming with a quite useful accuracy. The most significant advantage of the time-dependent material model is that it can address the effect of preheating time on forming. Preheating times shorter than ~120 s produce an increase in forming rate. This material model provides a quantitative means of accounting for that effect.

Local Thinning at a Die Entry Radius During Hot Gas-Pressure Forming of an AA5083 Sheet

2010 ◽  
Vol 132 (1) ◽  
Author(s):  
Eric M. Taleff ◽  
Louis G. Hector ◽  
John R. Bradley ◽  
Ravi Verma ◽  
Paul E. Krajewski
Keyword(s):  
Sheet Material ◽  
Sheet Thickness ◽  
Gas Pressure ◽  
Die Geometry ◽  
Fine Grained ◽  
Hot Gas ◽  
Element Simulation ◽  
Mechanism Of Failure ◽  
The Relationship ◽  
Lubrication Conditions

Splitting at regions of local thinning below die entry radii is a critically important mechanism of failure in hot gas-pressure forming of sheet materials. Local thinning is controlled by sheet-die friction and die geometry, as well as sheet material properties. In this study, local thinning is investigated at a particularly severe die entry radius during hot forming of a fine-grained AA5083 sheet at 450°C. Particular emphasis is placed on the relationship between local thinning and sheet-die friction conditions. A simple analysis of the mechanics of this thinning phenomenon is presented. Finite element simulation results are presented for different sheet-die friction conditions. Sheet thickness profiles measured from parts produced in forming experiments using three different lubrication conditions are compared with predictions from simulations. Simulation predictions agree well with experimental data for the occurrence and location of thinning below a die entry radius. Additional insights into sheet-die friction for controlling local thinning and preventing premature necking failure are detailed.

scholarly journals Hot Gas Forming of Aluminum Alloy Tubes Using Flame Heating

2020 ◽  
Vol 4 (2) ◽  
pp. 56 ◽  
Author(s):  
Ali Talebi-Anaraki ◽  
Mehdi Chougan ◽  
Mohsen Loh-Mousavi ◽  
Tomoyoshi Maeno
Keyword(s):  
Aluminum Alloy ◽  
Wall Thickness ◽  
Thickness Distribution ◽  
Forming Process ◽  
Hot Gas ◽  
Axial Feeding ◽  
Flame Heating ◽  
Lathe Machine ◽  
Aluminum Alloy Tube ◽  
Hot Gas Forming

Hot metal gas forming (HMGF) is a desirable way for the automotive industry to produce complex metallic parts with poor formability, such as aluminum alloys. A simple hot gas forming method was developed to form aluminum alloy tubes using flame heating. An aluminum alloy tube was heated by a flame torch while the tube was rotated and compressed using a lathe machine and simultaneously pressurized with a constant air pressure. The effects of the internal pressure and axial feeding on expansion and wall thickness distribution were examined. The results showed that the proposed gas forming method was effective for forming aluminum alloy tubes. It was also indicated that axial feeding is a vital parameter to prevent reductions in wall thickness by supplying the material flow during the forming process.

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