An improved model for predicting limiting drawing ratio

Verma, Rahul Kumar; Chandra, Sudeshna

doi:10.1016/j.jmatprotec.2005.10.006

Cited by 31 publications

(11 citation statements)

References 11 publications

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“…These parameters include die radius, unit BHF, friction coefficient, etc. [8][9][10]. They work together and have coupled influence on the forming process.…”

Section: Orthogonal Designmentioning

confidence: 99%

Finite element simulation on the deep drawing of titanium thin-walled surface part

Gao

Kou

et al. 2010

Rare Metals

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The deep drawing of titanium thin-walled surface part was simulated based on a self-developed three-dimensional finite element model. After an investigation on forming rules, a virtual orthogonal experimental design was adopted to determine the significance of processing parameters, such as die radius, blank holder force, and friction coefficient, on the forming process. The distributions of thickness and equivalent plastic strain of the drawn part were evaluated. The results show that die radius has a relative major influence on the deep drawing process, followed by friction coefficient and blank holder force.

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“…These parameters include die radius, unit BHF, friction coefficient, etc. [8][9][10]. They work together and have coupled influence on the forming process.…”

Section: Orthogonal Designmentioning

confidence: 99%

Finite element simulation on the deep drawing of titanium thin-walled surface part

Gao

Kou

et al. 2010

Rare Metals

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“…to lower tribological loads, however Choudhury et al (2006) have observed that, with the increase of friction coefficient the blank holder force decreases, Verma and Chandra (2006) concludes that the limiting drawing ratio (LDR) decreases with increase in the friction. On the other hand, Sutcliffe et al (2003) and Matuszak (2000) have shown that the lubrication regime is critical for formation of the transfer layer.…”

Section: Introductionmentioning

confidence: 99%

Experimental device for tribological measurement aspects in deep drawing process

Roizard¹,

Pothier²,

Hihn³

et al. 2009

Journal of Materials Processing Technology

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“…The models take into account important parameters such as the mechanical properties of the metal as well as the geometry of the cup and the friction coefficient. Recently, some researchers modified the classical analytical models to consider other effects such as bending/unbending and die arc region geometry . The LDR is calculated when equilibrium cannot be achieved anymore.…”

Section: Introductionmentioning

confidence: 99%

“…A constant Coulomb's friction coefficient, µ , is assumed in the model. The radial friction stress ( σ r0 ) is calculated from the blank holding force (BHF), assumed constant, as

σ_{r0} = \frac{BHF \times μ}{π t_{0} \times r_{0}}

in which r 0 is the radius of the rim of the deformed sheet.…”

Section: Introductionmentioning

confidence: 99%

Formability of AHSS under an Attach–Detach Forming Mode

Majidi

Barlat

Lee

et al. 2014

steel research int.

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In this work, a direct-drive digital servo-press functioning with a non-conventional punch displacement profile was used to enhance the drawability of DP780 and TR780 steel sheet samples. Cup drawing tests were conducted under multiple detachments between the tools and the partially deformed part. The experiments were conducted with a special die set-up that provides a decreasing blank holding force scheme during the test. The results were compared with those obtained with the same die set-up but with a more traditional V-type punch motion, which continuously keeps the contact between tool and work-piece. The percentage of successfully drawn cups and the depth of the fractured cups were considered to evaluate the performance of this approach. In addition, two sets of friction tests were conducted with a flat die on a specially designed testing machine. The friction coefficient was measured as a function of the normal contact pressure, which varies spatially and temporally during drawing. FE simulations were conducted in order to explain the differences in experimental results obtained using conventional and unconventional punch motions. In particular, the roles of a variable friction coefficient as well as that of springback after detachment of the tool from the blank were investigated. It was demonstrated that the combination of these two effects successfully explain the higher drawing performance achieved using the attach-detach mode.

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An improved model for predicting limiting drawing ratio

Cited by 31 publications

References 11 publications

Finite element simulation on the deep drawing of titanium thin-walled surface part

Finite element simulation on the deep drawing of titanium thin-walled surface part

Experimental device for tribological measurement aspects in deep drawing process

Formability of AHSS under an Attach–Detach Forming Mode

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