Investigation of Micro/Milli Flexible Deep Drawing Process

2012 ◽  
Vol 445 ◽  
pp. 241-246
Author(s):  
Ihsan Irthiea ◽  
Graham Green ◽  
Safa Hashim
Keyword(s):  
Deep Drawing ◽  
Material Model ◽  
Drawing Process ◽  
Flexible Forming ◽  
Forming Technology ◽  
Stainless Steel 304 ◽  
Application Potential ◽  
Volume Production ◽  
A New Technique ◽  
Metallic Foils

Flexible forming technology provides significant application potential in the manufacturing of complex shaped components even at miniaturized levels. The most attractive characteristic of this technology is simplicity, and its feasibility for prototype processes and low-volume production. The main purpose of this study is to clarify the decisive characteristics of micro deep drawing of metallic foils by using flexible forming technology. In this work a new technique is adopted using rigid punch, rigid holder and rubber pad, so that a particular gap is allocated between the blank holder and a fixed plate to allow the rubber pad to expand through it. The key process parameters studied here are rubber hardness, rubber-pad dimensions, drawing velocity, and initial gap value. Stainless steel 304 foils are used with thickness of 0.1mm. To investigate the effect of soft material properties, urethane rubber with hardness of 20, 40 and 60 shore A is utilized. Also, the punch diameter used in this study is 4mm. Moreover, many drawing experiments are conducted with punch velocities range of (0.1mm/s-100mm/s) to show the effect of process velocity. FEA using the commercial software ABAQUS/Standard is used to simulate the drawing process at micro scale. A hyperelastic material model is adopted to define the flexible pad and an elastic-plastic model is defined for the blanks.

Hydromechanical Deep Drawing of Funerary Vases: A Suitable Alternative to the Traditional Forming Processes

2007 ◽  
Vol 344 ◽  
pp. 485-492 ◽  
Author(s):  
Paolo Bortot ◽  
Elisabetta Ceretti ◽  
Antonio Fiorentino ◽  
Claudio Giardini
Keyword(s):  
Deep Drawing ◽  
Experimental Tests ◽  
Single Step ◽  
Drawing Process ◽  
Production Environment ◽  
Suitable Alternative ◽  
Hydromechanical Deep Drawing ◽  
Casting Technology ◽  
Fe Simulations ◽  
Volume Production

In the present paper a feasibility study of a funerary vase, made of stainless steel, using the Hydromechanical Deep Drawing process, is presented. The component is currently made of bronze and manufactured by die casting technology in a low volume production environment. To investigate the part feasibility, several FE simulations were implemented using the Aquadraw tool of the explicit FE code Pam Stamp 2G 2005®. The FE simulations showed that HDD process can produce the part in one single step without the requirement of finishing operations such as painting or polishing. Furthermore experimental tests were conducted and the first prototypes were successfully produced.

Experimental Study of the Small Lubrication Holes on the Die Shoulder on the Formability in Cylindrical Cup Deep-Drawing

2010 ◽  
Vol 37-38 ◽  
pp. 428-431
Author(s):  
Yu Qing Shi
Keyword(s):  
Deep Drawing ◽  
Mechanical Characteristics ◽  
Experimental Methods ◽  
Sheet Forming ◽  
Drawing Process ◽  
Forming Process ◽  
Deep Drawing Process ◽  
Forming Quality ◽  
Forming Technology ◽  
Cylindrical Cup

Wrinkling and tearing are major defects that usually occur in the deep-drawing process. This study presents a new sheet forming technology, together with machining small lubrication holes on the die shoulder. Deep drawing process of cylindrical cups with flange is investigated. Mechanical characteristics of die shoulder with small lubrication holes in deep drawing are analyzed. Numerical simulation and experimental methods are used to determine the influence on formability of machining small lubrication holes on the die shoulder. The results show that this new sheet forming process can improve formability and forming quality.

NUMERICAL SIMULATION OF DEEP DRAWING PROCESS OF ALUMINUM ALLOY SHEET USING CRYSTAL PLASTICITY

2008 ◽  
Vol 22 (31n32) ◽  
pp. 5901-5906
Author(s):  
JUNG GIL SHIM ◽  
YOUNG TAG KEUM
Keyword(s):  
Numerical Simulation ◽  
Aluminum Alloy ◽  
Crystal Plasticity ◽  
Deep Drawing ◽  
Texture Evolution ◽  
Material Model ◽  
Alloy Sheet ◽  
Drawing Process ◽  
Aluminum Alloy Sheet ◽  
Deep Drawing Process

In this study, the FEM material model based on the crystal plasticity is introduced for the numerical simulation of deep drawing process of A5052 aluminum alloy sheet. For calculating the deformation and stress in a crystal of aluminum alloy sheet, Taylor's model is employed. To find the texture evolution, the crystallographic orientation is updated by computing the crystal lattice rotation. In order to verify the crystal plasticity-based FEM material model, the strain distribution and the draw-in amount are compared with experimental measurements. The crystal FEM strains agree well with measured strains. The comparison of draw-in amount shows less 1.96% discrepancy. Texture evolution depends on the initial texture.

scholarly journals Development of reversed deep drawing without blank-holder for producing brass elliptical cup

2018 ◽  
Vol 7 (2) ◽  
pp. 578
Author(s):  
Ali Hassan ◽  
Hani Aziz ◽  
Ola Hussein
Keyword(s):  
Finite Element ◽  
Deep Drawing ◽  
Major Axis ◽  
Minor Axis ◽  
Drawing Process ◽  
Clearance Ratio ◽  
Blank Holder ◽  
Deep Drawing Process ◽  
Reverse Deep Drawing ◽  
A New Technique

A new technique “Reverse Deep Drawing Process” without blank holder was adopted, for the single stage to produce an elliptical cup through an elliptical die. In this process an elliptical-cup is produced by pushing an elliptical blank using a hollow elliptical punch through an elliptical die in a single stroke. FEM via ANSYS is used to analyze this process. The clearance ratio was varied to study its effect on some parameters of this process like load, stress, strain, thickness distributions. A die with clearance =1mm and blank thickness=1mm gave the best drawability in this technique and no wrinkling observed on the product but it has minimum earring. Several attempted have been done to get the shape and dimensions of the blank, the major axis (a) =85mm & the minor axis (b) =65 mm was the better blank for this process to produce elliptical cup of major axis is twice minor axis. Good agreements are evident between the experimental and finite element results; the discrepancy is 4.0797% for load-extension and 0.852% for the wall thickness in minor axis and 1.145% in major axis.

Deep drawing of cup shell by powder cavity flexible forming technology

2017 ◽  
Vol 24 (4) ◽  
pp. 766-772 ◽  
Author(s):  
Ya-hong Xue ◽  
Ke Chen ◽  
Cun-jie Fan ◽  
Jun-ting Luo
Keyword(s):  
Deep Drawing ◽  
Flexible Forming ◽  
Forming Technology

New Approach for Wrinkle Prediction in Deep Drawing Process

2015 ◽  
Vol 639 ◽  
pp. 459-466
Author(s):  
Fei Han ◽  
Ranko Radonjic
Keyword(s):  
Sheet Metal Forming ◽  
Deep Drawing ◽  
Metal Forming ◽  
Optical Measurement ◽  
Thin Sheet ◽  
Drawing Process ◽  
New Approach ◽  
Deep Drawing Process ◽  
Forming Technology ◽  
Buckling Test

Due to the extensive use of thin sheet metals to reduce weight of car bodies, wrinkling is becoming a more common and one of the most undesirable defects in sheet metal forming processes. Recent experiments at the Institute for Metal Forming Technology (IFU), University of Stuttgart, indicated that the buckling test using modified specimens can enhance accuracy for the predication of wrinkling [1]. In this paper a new method to predict the onset of the wrinkling will be introduced, and results of this test will be compared with real deep drawing parts. The wrinkle heights will be considered an evaluated regarding to results obtained by an optical measurement system.

Evaluation of the quality for sheet deep drawing using a magnetorheological fluid (MRF)

2015 ◽  
Vol 29 (24) ◽  
pp. 1550141 ◽  
Author(s):  
Feng Li ◽  
Peng Xu ◽  
Xiaochong Sui ◽  
Fujian Zhou
Keyword(s):  
Electric Current ◽  
Deep Drawing ◽  
Thickness Distribution ◽  
Magnetorheological Fluid ◽  
304 Stainless Steel ◽  
Drawing Process ◽  
Force Transmission ◽  
Boundary Circle ◽  
Deep Drawing Process ◽  
Forming Technology

Sealing problems, subsequent cleaning processes and poor force transmission effect etc. series of problems which strongly restrict the development and application of traditional medium pressure-based sheet forming technology. To overcome these problems, the magnetorheological fluid (MRF) can be used as the alternative force transmission medium. In this study, the deep drawing process of a 304 stainless steel sheet using MRF was investigated. The die cavity was filled with MRF and electric current was used to quantitatively adjust the magnetic fields distribution, which then controls the deformation behavior of the forming sheet. As compared to the conventional deep drawing process, experimental results clearly show that significant improvement in the produced sample quality was obtained when using the MRF with the electric current of 2 A. These improvements include: the height of the boundary circle reduces by 20%, the wall thickness distribution is more uniform, the rebound ratio correspondingly reduces from 9.6% to 0.67%, and the degree of sticking mode and the size precision are significantly increased. The results of this study provide scientific guidance to solve the bottleneck in the traditional deep drawing forming technology. The potential applications of the MRF-based new deep drawing technology to improve the product quality were explored.

Sign in / Sign up

Export Citation Format

Share Document