Effect of anisotropy and prebulging on hydromechanical deep drawing of mild steel cups

Zhang, Shihong; Jensen, Morten Rikard; Nielsen, Kjeld; Danckert, Joachim; Lang, Lihui; Kang, Di

doi:10.1016/s0924-0136(03)00656-3

Cited by 25 publications

(15 citation statements)

References 8 publications

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“…Zhang et al [1] - [3] studied effects of anisotropy, pre-bulging, counter pressure and blank holder force on formability of several parts such as round cups, parabolic cups and rectangular boxes in hydromechanical deep drawing process using both finite element analysis simulations and experiments. Lang et al [4] - [5] investigated forming of a complex square cup and a round cup using the hydromechanical deep drawing process with uniform pressure by both experiments and finite element analysis simulations.…”

Section: Introductionmentioning

confidence: 99%

FEA-Based Optimization of Blank Holder Force and Pressure for Hydromechanical Deep Drawing of Parabolic Cup using Greedy Search and RSM Methods

Intarakumthornchai¹,

Jirathearant²,

Thongprasert³

et al. 2010

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ABSTRACT2-D interval halving and response surface methods are presented to determine optimal process parameters of linear pressure and constant blank holder force profiles for hydromechanical deep drawing of a parabolic cup using finite element analysis. The optimization goal is to obtain the process parameters that minimize part thinning without any cracks and wrinkles. Part thinning and geometry-based wrinkle constraint functions are employed to quantify cracking and wrinkling severity. A response surface of part minimum thickness as a function of maximum internal pressure and blank holder force is constructed by using the data collected during the 2-D interval halving method. The optimum process parameters are then determined from the obtained surface. It is found that the method is capable to determine the optimal blank holder force and linear pressure profiles for hydromechanical deep drawing of the parabolic cup. KEYWORDS2-D interval halving method, response surface method, hydromechanical deep drawing, finite element analysis.

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Section: Introductionmentioning

confidence: 99%

FEA-Based Optimization of Blank Holder Force and Pressure for Hydromechanical Deep Drawing of Parabolic Cup using Greedy Search and RSM Methods

Intarakumthornchai¹,

Jirathearant²,

Thongprasert³

et al. 2010

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“…Pre-bulging is believed to be able to avoid wrinkles and to improve thickness distribution, thus the limit drawing ratio can be increased [1]. When pre-bulging is used, the unsupported portion of the blank between the punch and the blankholder is forced to bulge upwards (in the direction opposite to the punch displacement) [1].…”

Section: Introductionmentioning

confidence: 99%

“…When pre-bulging is used, the unsupported portion of the blank between the punch and the blankholder is forced to bulge upwards (in the direction opposite to the punch displacement) [1]. As a result, tensile stresses are produced in the circumferential direction of the extended portion so that the compressive stresses due to the drawing deformation are released [1]. The tension forces in the radial direction are also increased by the pre-bulging pressure, the body wrinkles are thus repressed.…”

Section: Introductionmentioning

confidence: 99%

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confidence: 99%

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Pre-bulging influence on an inverse drawn shape obtained with Hydromechanical Deep Drawing (HDD)

et al. 2010

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The HDD process performance and the quality of the formed parts can be influenced by many process variables, such as: fluid pressure, blankholder force, pre-bulging pressure, friction and punch speed [1]. Many studies report how pre-bulging characterization may be done in accordance with the fluid pressure variation [2] or with the maximum bulge height [3][4] value. In this paper, the authors use the maximum bulge height to characterize prebulging levels influence on the process feasibility. The effects of three different pre-bulging levels as well as the traditional geometric and process parameters on a specific component characterized by an inverse drawn shape have been analyzed. In the experimental phase, for each considered process condition the Thickness Reduction (TR) has been detected on the formed component in sixteen different points of interest, to verify numerical and experimental correlation. The good accuracy shown by the numerical model allowed to develop an appropriate numerical campaign to obtain an ANOVA analysis to evaluate the pre-bulging heights influence on TR distribution. The obtained results have shown that the pre-bulging height influences the TR distribution significantly but in a less way than punch radius and blankholder forces profile.

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“…The counter pressure path has an important effect on formability, and the variation of sheet thickness is expected to influence counter pressure path and hence the safe working zone ( Ref 7,8). Also in hydromechanical deep drawing, it is expected that the punch roughness affects drawability and the minimum required counter pressure (Ref 9,10).…”

Section: Introductionmentioning

confidence: 99%

Effect of Sheet Thickness and Punch Roughness on Formability of Sheets in Hydromechanical Deep Drawing

Kumar

Satapathy

Kumar

2010

J. of Materi Eng and Perform

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The importance of hydromechanical deep drawing is due to certain advantages over conventional deep drawing such as better formability, reduced number of manufacturing steps, improved surface finish, etc. Due to this, the potential applications of hydromechanical deep drawing have increased in the recent years. In this process, sheet metal parts are formed with the assistance of fluid pressure. The present work addresses the effect of sheet thickness and punch roughness on the formability of interstitial-free steel sheets in hydromechanical deep drawing. Experimental work has been done to study the influence of counter pressure on drawability by varying the sheet thickness and punch roughness. Finite element method has been used to simulate the process, and the results have been found to be in good agreement with the experimental results. It has been found out that the minimum required counter pressure for successful drawing increases with increase in sheet thickness. Drawability of 1.2 mm thick sheet improved with increase in punch roughness. As the punch roughness increases, the minimum required counter pressure decreases because of improved friction holding effect. For the same punch roughness, the minimum required counter pressure increases with increase in draw ratio.

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Effect of anisotropy and prebulging on hydromechanical deep drawing of mild steel cups

Cited by 25 publications

References 8 publications

FEA-Based Optimization of Blank Holder Force and Pressure for Hydromechanical Deep Drawing of Parabolic Cup using Greedy Search and RSM Methods

FEA-Based Optimization of Blank Holder Force and Pressure for Hydromechanical Deep Drawing of Parabolic Cup using Greedy Search and RSM Methods

Pre-bulging influence on an inverse drawn shape obtained with Hydromechanical Deep Drawing (HDD)

Effect of Sheet Thickness and Punch Roughness on Formability of Sheets in Hydromechanical Deep Drawing

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