Deformation Optimization for Inconel718 Superalloy Sheet Hydroforming Numerically and Experimentally

2011 ◽  
Vol 133 (6) ◽  
Author(s):  
Xu Yong-chao ◽  
Han Cong ◽  
Yuan Shijian
Keyword(s):  
Deep Drawing ◽  
Diameter Ratio ◽  
Drawing Ratio ◽  
Uniform Thickness ◽  
Minimum Thickness ◽  
Sheet Hydroforming ◽  
Hydromechanical Deep Drawing ◽  
Loading Paths ◽  
Reverse Deep Drawing

For deep cylindrical cups with a large height-diameter ratio, it is difficult to be hydroformed in one stroke. Reverse deep drawing is necessary after deep drawing. Deformation optimization was performed to achieve a large drawing ratio and uniform thickness. An inconel718 superalloy deep cup was investigated numerically and experimentally. For a larger total drawing ratio 3.1, different deformations were analyzed for hydromechanical deep drawing and reverse hydromechanical deep drawing under the condition of different loading paths. Effects of deformations were discussed on the thickness. Typical defects were analyzed for different deformation. Optimal deformation was determined for hydromechanical deep drawing and reverse hydromechanical deep drawing. The results show that a superalloy cup with a total drawing ratio 3.1 could be successfully hydroformed, and the minimum thickness is 0.65 mm.

scholarly journals Investigation on the Effect of Type of Cooling on the Properties of Aluminum Alloy during Warm/Hot Hydromechanical Deep Drawing

Symmetry ◽  
2018 ◽  
Vol 10 (9) ◽  
pp. 362 ◽  
Author(s):  
Gaoshen Cai ◽  
Chuanyu Wu ◽  
Dongxing Zhang
Keyword(s):  
Mechanical Properties ◽  
Aluminum Alloy ◽  
Microstructure Evolution ◽  
Deep Drawing ◽  
Water Cooling ◽  
Sheet Hydroforming ◽  
Hydromechanical Deep Drawing ◽  
Different Types ◽  
Warm Hydroforming ◽  
The Stability

The warm sheet cylindrical deep drawing experiment of aluminum alloy was carried out and macro-mechanical properties and microstructure evolution of hydro-formed cups with different cooling medium were analyzed, which aimed to investigate the effects of different types of cooling on mechanical properties and microstructure of cylindrical cups hydro-formed by warm Hydro-mechanical Deep Drawing (HDD). Results show that, under the condition of warm hydroforming, the mechanical properties such as yield stress and ultimate strength were influenced very little by air or water cooling. Grain coarsening of these hydro-formed cups can be inhibited to a certain extent with subsequent rapid water cooling. Moreover, it shows that the processing with warm sheet hydroforming and subsequent rapid cooling of 7075-O aluminum alloy has a positive significance in maintaining the stability of macro mechanical properties and inhibiting the degradation of the microstructure of materials.

On the Scale Dependence of Micro Hydromechanical Deep Drawing

2016 ◽  
Vol 725 ◽  
pp. 689-694 ◽  
Author(s):  
Hideki Sato ◽  
Kenichi Manabe ◽  
Tsuyoshi Furushima ◽  
Dong Bin Wei ◽  
Zheng Yi Jiang ◽  
...  
Keyword(s):  
Deep Drawing ◽  
Hydrodynamic Lubrication ◽  
Radial Pressure ◽  
Plasticity Theory ◽  
Minimum Thickness ◽  
Feature Size ◽  
Hydromechanical Deep Drawing ◽  
Compression Effect ◽  
Counter Pressure ◽  
Lubrication Effect

Tooling feature size to minimum thickness becomes small in micro scale products and its ratio affects the deformation behavior in micro sheet forming significantly. In this study, the effect of this relative tooling feature size on drawing characteristics and effects to improve the drawability, such as friction holding effect, hydrodynamic lubrication effect and compression effect by blank edge radial pressure, in micro hydromechanical deep drawing (MHDD) are investigated using plasticity theory and numerical simulation. The results show that the micro drawing characteristics in MHDD can be improved by applying counter pressure. However, the required fluid pressures for friction holding and hydrodynamic lubrication effects increase as the relative punch diameter and/or die shoulder radius to thickness decrease, although the compression effect by radial pressure on the blank edge is independent of the relative tooling feature size.

Investigation of consecutive two-stage hydrodynamic deep drawing of aluminum cylindrical cups

2021 ◽  
pp. 095440542110622
Author(s):  
Seyed Hassan Alavi Hashemi ◽  
Seyed Mohammad Hossein Seyedkashi
Keyword(s):  
Deep Drawing ◽  
Diameter Ratio ◽  
Drawing Ratio ◽  
Drawing Process ◽  
Effective Parameters ◽  
Limit Drawing Ratio ◽  
Deep Drawing Process ◽  
Hydrodynamic Deep Drawing ◽  
Element Simulation ◽  
Simulation Results

In the deep drawing process, achieving a higher drawing ratio has always been considered by researchers. In this study, a new concept of hydrodynamic deep drawing with two consecutive stages without additional operations such as annealing is proposed to increase the limit drawing ratio of the cups. The effective parameters were investigated numerically and experimentally in the forming of Al1200 cylindrical cups. At first, the desired value of punch diameter ratio was determined based on finite element simulation results and was utilized to increase the cup formability. Next, the effects of pressure paths on the cup thickness, separation, and rupture were studied in each forming stage. The cup formability was investigated based on a new proposed framework to obtain the maximum possible limiting drawing ratio, and the desired conditions were determined. Finally, a cup was formed with a high drawing ratio of 3.4 which was a good achievement in comparison with the literature.

A Study on DOE Methods for Hydromechanical Deep Drawing Process Parameters

2012 ◽  
Vol 217-219 ◽  
pp. 1602-1608 ◽  
Author(s):  
Mehmet Halkacı ◽  
Huseyin Selcuk Halkaci ◽  
Mevlut Turkoz ◽  
Behçet Dağhan
Keyword(s):  
Process Parameters ◽  
Deep Drawing ◽  
Design Method ◽  
Performance Criteria ◽  
Drawing Ratio ◽  
Robust Parameter Design ◽  
Effective Parameters ◽  
Hydromechanical Deep Drawing ◽  
Robust Parameter ◽  
Blank Diameter

Formability of sheet metals can be increased by Hydromechanical Deep Drawing (HDD) process. Formability of the deep drawn cups is generally assessed by Limiting Drawing Ratio (LDR) which is the ratio of the blank diameter to punch diameter. In order to increase LDR by HDD, process parameters of the HDD should be arranged properly. Arranging of the process parameters requires a great knowledge about the effects of the process parameters to certain performance criteria of the process. Determining of the effects of the process parameters by full factorial experiments is a hard duty. Hence certain statistical methods that decrease the number and the cost of the experiments and reduce the time should be used to find effective parameters and their appropriate levels. In this study orthogonal experimental array was applied and effective process parameters were determined by analyzing predicted data with Taguchi's robust parameter design method and ANOVA method. Then the results were compared with each other to evaluate differences between the methods. By using the appropriate levels of the parameters the LDR of AA 5754 aluminum alloy which uses in automotive industry intensely was determined.

Production of Tapered Cups by Sequential Deep Drawing of Sheet Metals Using Drawn Cups as a Part of Punch

1993 ◽  
Vol 115 (2) ◽  
pp. 224-229 ◽  
Author(s):  
K. Yamaguchi ◽  
K. Kanayama ◽  
M. H. Parsa ◽  
N. Takakura
Keyword(s):  
Deep Drawing ◽  
Drawing Ratio ◽  
Drawing Process ◽  
Sheet Metals ◽  
Deep Drawing Process ◽  
Drawing Method

A new deep drawing process of sheet metals is developed to facilitate small-lot production of deep cups with large drawing ratio. In this process, unlike the conventional deep drawing method, a few drawn cups are always stacked on the punch and used as a part of punch for the subsequent deep drawing of a given blank. Before drawing a new blank, a drawn cup which is in contact with the punch is stripped off. The repetition of such stripping and drawing operations makes it possible to carry out both the first-stage drawing and the subsequent slight redrawings in one drawing operation using only one pair of punch and die. In this paper, this new deep drawing process is applied to the production of tapered cups and the main feature of the process is shown.

Experimental Investigation on Hydromechanical Deep Drawing of Aluminum Alloy with Heated Media

2012 ◽  
Vol 83 (3) ◽  
pp. 230-237 ◽  
Author(s):  
Lihui Lang ◽  
Baosheng Liu ◽  
Tao Li ◽  
Xiangni Zhao ◽  
Yuansong Zeng
Keyword(s):  
Experimental Investigation ◽  
Aluminum Alloy ◽  
Deep Drawing ◽  
Hydromechanical Deep Drawing

Formability and Process Conditions of Magnesium Alloy Sheets

2005 ◽  
Vol 488-489 ◽  
pp. 453-456 ◽  
Author(s):  
Shi Hong Zhang ◽  
Yong Chao Xu ◽  
G. Palumbo ◽  
S. Pinto ◽  
Luigi Tricarico ◽  
...  
Keyword(s):  
Deep Drawing ◽  
Tensile Tests ◽  
Process Conditions ◽  
Drawing Ratio ◽  
Temperature Range ◽  
Fine Grained ◽  
Axial Tensile ◽  
Die Surface ◽  
Lower Temperature Range ◽  
Lower Temperature

Comparing the formability with each other, extrusion and various rolling experiments were carried out to make fine-grained AZ31 Mg sheets, and uni-axial tensile tests were carried out at different strain rates and temperatures to investigate the effect of different variables. A warm deep drawing tool setup with heating elements, which were distributed under the die surface and inside the blank holder, was designed and manufactured, and deep drawing was performed. Extruded Mg alloy AZ31 sheets exhibit the best deep drawing ability when working in the temperature range 250-350°C. Extruded and rolled sheets of 0.8 mm thick were also deep drawn in the lower temperature range 105-170°C，showing good formability and reaching a Limit Drawing Ratio up to 2.6 at 170°C for rolled sheets. At last, a sheet cup 0.4 mm thick was deep drawn successfully at 170 °C.

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