scholarly journals Influence of varying sheet material properties on dry deep drawing process

2019 ◽  
Vol 651 ◽  
pp. 012012
Author(s):  
K Krachenfels ◽  
B Rothammer ◽  
R Zhao ◽  
S Tremmel ◽  
M Merklein
Keyword(s):  
Material Properties ◽  
Deep Drawing ◽  
Sheet Material ◽  
Drawing Process ◽  
Deep Drawing Process

A Study on Initial Blank Design to Minimize Earing in Multi-Stage Deep Drawing Process for Rectangular Cup Using High Strength Steel Material

2013 ◽  
Vol 652-654 ◽  
pp. 1971-1975
Author(s):  
Pan Liu ◽  
Tae Wan Ku ◽  
Beom Soo Kang
Keyword(s):  
Deep Drawing ◽  
Sheet Material ◽  
Simulation Models ◽  
Drawing Process ◽  
Element Analysis ◽  
Normal Anisotropy ◽  
Deep Drawing Process ◽  
Initial Blank ◽  
Multi Stage ◽  
Blank Shape

Multi-stage deep drawing process for rectangular cups with extreme aspect ratio using finite element analysis is performed. The process is mainly consists of four forming stages including blanking, drawing, ironing and trimming. However, main deformation of the rectangular cup is completed during the drawing-ironing procedure. Tool design and blank modification for the multi-stage deep drawing process are presented. To consider the deep drawing and the ironing operations, the multi-stage deep drawing process is applied to obtain the rectangular cup by using each numerical simulation models from first to fifth drawing. Based on the design results of the initial blank, the multi-stage deep drawing process is performed, but it is shown that severe earing phenomenon is occurred at the upper flange part. To solve the severe deformation at the upper flange due to normal anisotropy of the used sheet material, initial blank modification is carried out. The simulation results for the rectangular cup are compared with the final configuration before and after the modification of the blank shape. The predicted result is confirmed that the modified blank shape not only improve the quality of a deep-drawn product but also reduce the cost of production.

scholarly journals Experimental and Numerical Assessment of the Hot Sheet Formability of Martensitic Stainless Steels

2020 ◽  
Vol 4 (4) ◽  
pp. 122
Author(s):  
Peter Birnbaum ◽  
Enrique Meza-García ◽  
Pierre Landgraf ◽  
Thomas Grund ◽  
Thomas Lampke ◽  
...  
Keyword(s):  
Stainless Steels ◽  
Deep Drawing ◽  
Sheet Material ◽  
Uniaxial Tensile ◽  
Process Conditions ◽  
Uniaxial Tensile Test ◽  
Drawing Process ◽  
Deep Drawing Process ◽  
Martensitic Stainless Steels ◽  
Sheet Formability

Hot formed sheet components made of Martensitic Stainless Steels (MSS) can achieve ultra-high strengths in combination with very high corrosion resistance. This enables to manufacture complex lightweight sheet components with longer lifespan. Nevertheless, the hot formability of MSS sheets has not been accurately evaluated considering high temperatures and complex stress and strain states. In this work, the hot sheet formability of three MSS alloys under thermomechanical process conditions was investigated. Initially, mechanical properties of this sheet material were determined by uniaxial tensile test. Finite Element Method (FEM) simulation of a hot deep drawing process was performed under consideration of thermo physical calculated material models using the software JMatPro® and Simufact Forming® 15.0. The resulting strains and cooling rates developed locally in the work piece during the forming process were estimated. The numerical results were validated experimentally. Round cups were manufactured by hot deep drawing process. The resulting maximum drawing depth and hardness were measured. In general, all three alloys developed very good formability at forming temperatures between 700 and 900 °C and increased hardness values. However, they are highly susceptible to chemical composition, austenitization temperature, dwell time, and flange gap. A statistic approach is given to explain the correlation between hardness and its influencing factors.

Deformation Behavior of Single Prismatic Battery Cell Cases and Cell Assemblies Loaded by Internal Pressure

2021 ◽  
pp. 1-16
Author(s):  
Thanh Nguyen ◽  
Jie Deng ◽  
Brian Robert ◽  
Weinong Chen ◽  
Thomas Siegmund
Keyword(s):  
Finite Element ◽  
Cell Wall ◽  
Internal Pressure ◽  
Wall Thickness ◽  
Material Properties ◽  
Deep Drawing ◽  
Cell Wall Thickness ◽  
Drawing Process ◽  
Battery Cell ◽  
Deep Drawing Process

Abstract The safety of electrochemical energy storage system depends on the structural integrity of the call containment. Nominal values of cell case dimensions and material properties are the standard inputs for the mechanical analysis of prismatic lithium-ion batteries. However, such data usually does not account for any considerations on the influence of the manufacturing processes of the cell case. This study investigates the effects of the cell wall thickness and elastic modulus, resulting from deep-drawing process, on the cell and cell assembly response. It is found that the deep-drawing process degrades Young’s modulus relative to standard values and leads to a spatial variation the wall thickness of the cell case. The use of actual cell case material properties and cell wall thickness values is required to obtain validated finite element models of the battery cell case. Using experiments on internal pressure loaded single battery cells and finite element computations, it is demonstrated that the use of nominal cell casing characteristics significantly underestimates the resistance provided by the cell case to counter swelling of the active battery components.

Analytical and numerical investigation of wrinkling limit diagram in deep drawing of two-layer sheets with experimental verification

2021 ◽  
pp. 146442072098531
Author(s):  
AH Bamdad ◽  
R Hashemi
Keyword(s):  
Material Properties ◽  
Deep Drawing ◽  
Analytical Approach ◽  
Experimental Tests ◽  
Drawing Process ◽  
Blank Holder Force ◽  
Blank Holder ◽  
Deep Drawing Process ◽  
Layer Stacking ◽  
The Impact

Wrinkling, which is primarily caused by insufficient blank holder force, is a significant issue that induces inconsistencies in forming parts, particularly in the deep drawing process. In this article, an investigation of the wrinkling in the deep drawing process of two-layer sheets is performed through an analytical approach, numerical method, and experimental tests. Increasing in the blank holder force, the process is under control by the proposed algorithm. Consequently, it aims to find the minimum required blank holder force to avoid wrinkling. The energy technique is utilized to predict the wrinkling in the analytical approach. Similarly, finite element simulations are implemented to investigate the effect of forming parameters on wrinkling. The experimental tests are performed to verify the analytical and numerical results. The impact of the material properties and stacking sequences (lay-up) on blank holder force and forming force are studied. Results show that the optimum blank holder force is dependent on the material properties, blank geometry, and layer stacking sequences. Also, a good agreement between analytical, numerical, and experimental results is achieved.

Wrinkling Prediction of Rectangular Cup Deep Drawing Process for Aluminum Alloy Sheets by Using the Modified Yoshida Buckling Test

2020 ◽  
Vol 856 ◽  
pp. 143-151
Author(s):  
Tanongsak Bunyan ◽  
Suthep Yiemchaiyaphum ◽  
Sansot Panich
Keyword(s):  
Aluminum Alloy ◽  
Deep Drawing ◽  
Yield Criterion ◽  
Sheet Material ◽  
Side Wall ◽  
Fe Model ◽  
Drawing Process ◽  
Deep Drawing Process ◽  
Wall Area ◽  
Buckling Test

Nowadays, the industry has been growing interest in lightweight material for automotive and cookware manufacturing. The formability of sheet material is an important issue in these industries. The wrinkling behavior is one of the most failure in sheet metal forming and is often occurred in deep drawing process in cookware manufacturing. In this work, the developed wrinkling limit curves (WLCs) using experimental and numerical simulation of a modified Yoshida buckling test were precisely used to predict the wrinkling behavior of rectangular cup deep drawing for aluminum alloy sheets grade AA5054-O and AA5052-H32. The Industrial parts, the rectangular cup deep drawing was firstly performed for both investigated aluminum sheets for obtaining the wrinkling initiation on the side wall area of deep drawing parts. Subsequently, the experimental formed parts were carefully measured the draw-in of deformed blank sheets and drawing depth to validate the finite element (FE) model. Then, the FE simulation of the corresponding drawing tests were calculated, by which were implemented with the Hill’48 yield criterion and Swift hardening law to descript anisotropic plastic deformation. As a result, the local principle Major and Minor principle strains of observed wrinkle areas were gathered in the side wall area of the rectangular cup deep drawing test. Finally, the developed WLCs of aluminum alloy sheets were applied to predict the wrinkling formation of the formed deep drawing parts. Comparatively, the influence of different aluminum alloy grades on the WLCs and wrinkling behavior were explicitly investigated.

Analytical Solutions and Finite Element Modelling of Deep Drawing Process for Cylindrical Metal Cups

2010 ◽  
Vol 443 ◽  
pp. 104-109
Author(s):  
Jeerachai Supasuthakul ◽  
Peter D. Hodgson ◽  
Matthias Weiss ◽  
Chun Hui Yang
Keyword(s):  
Finite Element ◽  
Process Design ◽  
Material Properties ◽  
Deep Drawing ◽  
Finite Element Modelling ◽  
Analytical Models ◽  
Finite Element Models ◽  
Drawing Process ◽  
Deep Drawing Process ◽  
Cylindrical Metal

Analytical modelling of deep drawing process is of value in preliminary process design to illustrate the influence of major variables including friction and strain hardening on punch loads, cup dimensions and process limits. In this study, analytical models including theoretical solution and a series of finite element models are developed to account for the influences of process parameters including friction coefficient, tooling geometry and material properties on deep drawing of metal cups. The accuracy of both the theoretical and finite element solutions is satisfactory compared with those from experimental work.

scholarly journals Effect of Tool Geometry Parameters on the Formability of a Camera Cover in the Deep Drawing Process

Materials ◽  
2021 ◽  
Vol 14 (14) ◽  
pp. 3993
Author(s):  
Thanh Trung Do ◽  
Pham Son Minh ◽  
Nhan Le
Keyword(s):  
Deep Drawing ◽  
Thickness Distribution ◽  
Metal Flow ◽  
Sheet Thickness ◽  
Side Wall ◽  
Tool Geometry ◽  
Drawing Process ◽  
Nose Radius ◽  
Deep Drawing Process

The formability of the drawn part in the deep drawing process depends not only on the material properties, but also on the equipment used, metal flow control and tool parameters. The most common defects can be the thickening, stretching and splitting. However, the optimization of tools including the die and punch parameters leads to a reduction of the defects and improves the quality of the products. In this paper, the formability of the camera cover by aluminum alloy A1050 in the deep drawing process was examined relating to the tool geometry parameters based on numerical and experimental analyses. The results showed that the thickness was the smallest and the stress was the highest at one of the bottom corners where the biaxial stretching was the predominant mode of deformation. The problems of the thickening at the flange area, the stretching at the side wall and the splitting at the bottom corners could be prevented when the tool parameters were optimized that related to the thickness and stress. It was clear that the optimal thickness distribution of the camera cover was obtained by the design of tools with the best values—with the die edge radius 10 times, the pocket radius on the bottom of the die 5 times, and the punch nose radius 2.5 times the sheet thickness. Additionally, the quality of the camera cover was improved with a maximum thinning of 25% experimentally, and it was within the suggested maximum allowable thickness reduction of 45% for various industrial applications after optimizing the tool geometry parameters in the deep drawing process.

Blank shape optimization in the deep drawing process by sun method

2021 ◽  
Author(s):  
Hamidreza Gharehchahi ◽  
Mohammad Javad Kazemzadeh-Parsi ◽  
Ahmad Afsari ◽  
Mehrdad Mohammadi
Keyword(s):  
Shape Optimization ◽  
Deep Drawing ◽  
Drawing Process ◽  
Deep Drawing Process ◽  
Blank Shape Optimization ◽  
Blank Shape

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.

Sign in / Sign up

Export Citation Format

Share Document