A New Technique for the Investigation of Tribological Behavior of Sliding Pairs Used in Hot Forming Processes

2008 ◽  
Author(s):  
Vjekoslav Franetovic
Keyword(s):  
Tribological Behavior ◽  
Hot Forming ◽  
New Technique ◽  
Aluminum Sheet ◽  
Forming Process ◽  
The Real ◽  
Plastic Forming ◽  
Quick Plastic Forming ◽  
A New Technique ◽  
Interacting Surfaces

Hot forming of aluminum sheet is highly influenced by the tribological behavior of the interacting surfaces of sliding pairs. Here we describe a new technique to investigate tribo-pair candidates for Quick Plastic Forming (QPF) and warm forming processes. This technique represents a bench type simulation of the real forming process where the sheet and tool interact by sliding against each other in a single motion (slide/stroke).

scholarly journals Development of numerical tool for hybrid manufacturing process for titanium sheet metal forming

2020 ◽  
Vol 321 ◽  
pp. 04026
Author(s):  
Mohamed ACHOURI
Keyword(s):  
Aerospace Industry ◽  
Material Behavior ◽  
Hot Forming ◽  
Simulation Tool ◽  
Forming Process ◽  
Simulation Strategy ◽  
Super Plastic ◽  
Plastic Forming ◽  
Aeronautical Industry ◽  
Super Plastic Forming

The use of titanium in the aerospace industry has grown considerably in recent years in conjunction with the development of composite aircraft. In this way, improving titanium forming has become an important issue for the industry, both for productivity objectives and the ability to deliver basic parts according to the needs imposed by aircraft delivery rates, as well as for cost objectives. Currently, hot forming of titanium parts can be achieved through two processes: Super-plastic forming (SPF) or Hot Forming (HF). The aeronautical industry wanted to develop an innovative process for the manufacture of titanium parts by coupling the HF and SPF processes in order to exploit the advantages of these two technologies. The development of a mixed HF / SPF process will thus not only improve the rates and allow better control of the quality of the formed parts (thickness homogeneity), but also, by allowing forming at lower temperatures, this hybrid process presents a large interest at the energy plan. The study was devoted to the development of a hybrid HF/SPF process, carried out at a common temperature, allowing the “pre-forming” of the part in HF mode and the “calibration” of the part in SPF mode, while respecting a global cycle time compatible with the objectives of the aerospace industry and guaranteeing the quality expected for the final complex part. Improving the performance of the final part requires a development of numerical simulation tool of the forming process. The available simulation tool (ABAQUS/ Standard) must be adapted to define the best simulation strategy according to the simulated parts; moreover, it remains imperative to determine the input data (material behavior laws of titanium alloys) adapted to the cases to be treated (strain rate and process temperature).

Tribological Testing of Graphite and Boron Nitride Lubricant Formulations for High Temperature Aluminum Sheet Forming Processes

2007 ◽  
Author(s):  
M. David Hanna ◽  
Paul E. Krajewsk ◽  
James G. Schroth
Keyword(s):  
High Temperature ◽  
Boron Nitride ◽  
Superplastic Forming ◽  
Solid Lubricants ◽  
Sheet Forming ◽  
Aluminum Sheet ◽  
Plastic Forming ◽  
Quick Plastic Forming ◽  
Performance And Evaluation

The tribological behavior of AA5083 aluminum sheet sliding against tool steel impacts the quality of components manufactured with the elevated temperature metal forming processes such as Quick Plastic Forming (QPF), Superplastic Forming (SPF), or warm forming. This study focuses on the tribological performance and evaluation of alternative solid lubricants using a flat-on-flat tribo-tester to simulate sheet forming at high temperature applications. Improved lubricant formulations containing boron nitride with graphite additions were found to enhance lubricity while maintaining good adherence to the surface of the aluminum blank at a temperature of 450°C.

High-Temperature Forming of a Vehicle Closure Component in Fine-Grained Aluminum Alloy AA5083: Finite Element Simulations and Experiments

2010 ◽  
Vol 433 ◽  
pp. 197-209 ◽  
Author(s):  
Louis G. Hector ◽  
Paul E. Krajewski ◽  
Eric M. Taleff ◽  
Jon T. Carter
Keyword(s):  
Finite Element ◽  
High Temperature ◽  
Sheet Thickness ◽  
Alloy Sheet ◽  
Forming Process ◽  
Material Models ◽  
Fine Grained ◽  
Plastic Forming ◽  
Quick Plastic Forming ◽  
Forming Defects

Fine-grained AA5083 aluminum-magnesium alloy sheet can be formed into complex closure components with the Quick Plastic Forming process at high temperature (450oC). Material models that account for both the deformation mechanisms active during forming and the effect of stress state on material response are required to accurately predict final sheet thickness profiles, the locations of potential forming defects and forming cycle time. This study compares Finite Element (FE) predictions for forming of an automobile decklid inner panel in fine-grained AA5083 using two different material models. These are: the no-threshold, two-mechanism (NTTM) model and the Zhao. The effect of sheet/die friction is evaluated with five different sheet/die friction coefficients. Comparisons of predicted sheet thickness profiles with those obtained from a formed AA5083 panel shows that the NTTM model provides the most accurate predictions.

The Effect of Boron Nitride Lubricant Thickness and Steel Surface Condition on Tribological Behavior of P20 Steel/5083 Aluminum Sliding Pairs at High Temperature

2008 ◽  
Author(s):  
M. David Hanna ◽  
Vjekoslav Franetovic
Keyword(s):  
Boron Nitride ◽  
Tribological Behavior ◽  
Surface Condition ◽  
Lubricant Thickness ◽  
Test Technique ◽  
Uncoated Steel ◽  
Plastic Forming ◽  
Quick Plastic Forming ◽  
Speed Method

The tribological behavior of AA5083 aluminum sheet sliding against tool steel impacts the quality of components manufactured with the Quick Plastic Forming (QPF) process. The effect of boron nitride lubricant thickness on the tribological performance of different coated steel/AA5083 pairs utilizing a recently developed reciprocating flat-on-flat tribological test technique was investigated. In most cases of coated and uncoated steel, the time-to-contact increased by a factor of ten when the BN thickness was increased from 8.4 μm to 14.5 μm. The tribological tests with a low sliding speed method (0.1 Hz) confirmed the previous observations conducted at 0.5 Hz in which nitrocarburizing of the tool surface decreased adhesion of aluminum to the steel during sliding contact.

Overview of Quick Plastic Forming Technology

2007 ◽  
Vol 551-552 ◽  
pp. 3-12 ◽  
Author(s):  
Paul E. Krajewski ◽  
James G. Schroth
Keyword(s):  
General Motors ◽  
Future Research ◽  
Forming Process ◽  
Forming Technology ◽  
Complex Shapes ◽  
Plastic Forming ◽  
Quick Plastic Forming ◽  
Process Material

General Motors has developed Quick Plastic Forming (QPF) as a hot blow forming process capable of producing aluminum closure panels at high volumes. This technology has been successfully implemented for automotive liftgates and decklids with complex shapes. This talk will review key elements of the QPF process, describe some of the technical achievements realized in this process, and identify areas for future research in process, material, and lubricant development.

Brachytherapy in Prostate Cancer: The use of QuickLink® System Within the Real-Time Technique. A New Technique is Presented

2009 ◽  
Vol 76 (1) ◽  
pp. 41-44 ◽  
Author(s):  
E. Gastaldi ◽  
L. Chiono ◽  
F. Gallo ◽  
M. Schenone ◽  
G. Ninotta ◽  
...  
Keyword(s):  
Prostate Cancer ◽  
Real Time ◽  
New Technique ◽  
The Real ◽  
A New Technique

Improved Tribological Performance of Tribo-Pairs by Optimization of Sliding Speed: Implications for Hot Forming Processes

2008 ◽  
Author(s):  
Vjekoslav Franetovic
Keyword(s):  
Cost Effectiveness ◽  
Friction Coefficient ◽  
Tribological Performance ◽  
Hot Forming ◽  
Sliding Speed ◽  
Plastic Forming ◽  
Quick Plastic Forming ◽  
Aluminum Panels ◽  
The Cost

The tribology of hot forming processes is highly critical for the quality of formed aluminum panels and the cost-effectiveness of hot forming. In this report a flat-on-flat experimental technique for tribological evaluation of a single stroke was used to investigate the effect of sliding speed on the operative friction coefficient (FC) and tribological failure of the tribo-pairs used in Quick Plastic Forming (QPF) and warm forming processes.

Improved Hot Aluminum Forming Tribology by Anodization

2007 ◽  
Author(s):  
Vjekoslav Franetovic ◽  
James G. Schroth
Keyword(s):  
Tribological Behavior ◽  
Laboratory Scale ◽  
Local Interaction ◽  
General Motors ◽  
Aluminum Surface ◽  
Steel Tool ◽  
Plastic Forming ◽  
Quick Plastic Forming

The process of Quick Plastic Forming (QPF) developed by General Motors involves hot aluminum forming at ∼450°C, and has formability advantages over conventional stamping of aluminum or steel. However, there are still no fully satisfactory solutions for the problem of local interaction/sticking between the aluminum blank and the tool, and the eventual transfer of some aluminum to the steel tool after repeated forming cycles. In this paper we show that the process of anodizing aluminum prior to forming greatly diminishes the interaction of aluminum with steel at QPF forming temperatures. Significantly improved tribological behavior of the aluminum surface after anodization as compared to lubricated aluminum was shown on a laboratory scale with flat-on-flat reciprocating experiments.

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