An investigation of step taper-shaped punch in piercing process using finite element method

Thipprakmas, Sutasn; Rojananan, Siriporn; Paramaputi, Pravitr

doi:10.1016/j.jmatprotec.2007.06.022

Cited by 24 publications

(18 citation statements)

References 4 publications

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“…This analytical code includes automatic mesh generation, which allows users to specify the remeshing and optimization criteria for an intelligent mesh based on the behavior of the solution. In addition, this analytical code generates cut surface features [12][13][14] and flange shapes [3,6,10,11] that are in good agreement with those obtained experimentally. Table 1 shows the process parameters used in punching and flange-forming operations.…”

Section: The Fem Simulation and Experimental Proceduressupporting

confidence: 61%

“…The punching and flangeforming speeds were set at 4 mm/s. Given the use of lubricants during the punching and flange-forming phases, the Coulomb friction model with a friction coefficient of 0.1 was applied as in previous research [3,6,[10][11][12]. Rectangular elements of approximately 5,000 elements were set for the workpiece, and a fine mesh density was assigned to the deformation zone.…”

Section: The Fem Simulation and Experimental Proceduresmentioning

confidence: 99%

“…To display the fundamental failure and form of the cut surface in the FEM simulation, the ductile fracture criteria were considered and the element deletion routine utilized in this FEM code was also considered. The ductile fracture (b) flanging-forming operation The critical fracture value was determined by comparing the FEM simulation results of tensile testing and punching operation with experimentally observed results [11][12][13][14].…”

Section: The Fem Simulation and Experimental Proceduresmentioning

confidence: 99%

“…The conventional cut surface features consist of four portions of die-roll, smooth surface, crack, and burr [12,13]. In addition, poor squareness generally occurs on the conventional cut surface [12,13].…”

Section: Effects Of Upward and Downward Burr Orientation Flange-formimentioning

confidence: 99%

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Finite element analysis of flange-forming direction in the hole flanging process

Thipprakmas

Phanitwong

2011

Int J Adv Manuf Technol

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The hole flanging process, in which a pre-holed workpiece is expanded by a larger punch, is frequently used in many industries. However, due to the large number of process parameters and their complicated relationships, poor flange edge squareness is commonly generated and results in an increase of secondary operation. In this study, to improve the quality of flange parts, finite element method (FEM) was used to investigate the flange-forming mechanism and effects of upward and downward burr orientation flange-forming directions. Laboratory experiments were performed to validate the accuracy of the FEM simulation results. The FEM simulation results clearly explained the flange-forming mechanism, as well as the effects of flange-forming direction, based on stress distribution analysis. Upward and downward burr orientation flange-forming directions were suitably applied for large and small hole expansion ratios, respectively. In addition, the effects of other process parameters related to the flangeforming direction, including punching clearance, flange thickness, and hole expansion ratios, were also investigated. The FEM simulation results showed good agreement with the laboratory experiments. These results showed that to achieve good squareness at the flange edge, the use of upward and downward burr orientation flange-forming direction and its relation to the other process parameters need to be considered.

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Section: The Fem Simulation and Experimental Proceduressupporting

confidence: 61%

Section: The Fem Simulation and Experimental Proceduresmentioning

confidence: 99%

Section: The Fem Simulation and Experimental Proceduresmentioning

confidence: 99%

Section: Effects Of Upward and Downward Burr Orientation Flange-formimentioning

confidence: 99%

See 2 more Smart Citations

Finite element analysis of flange-forming direction in the hole flanging process

Thipprakmas

Phanitwong

2011

Int J Adv Manuf Technol

Self Cite

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“…Therefore, the improvement of the quality of the sheared edge of punched sheets is useful for increasing the fatigue life. Thipprakmas et al [7] have improved the quality of the punched edge of aluminium sheets by shaving with a taper punch. Kim et al [8] have developed a burr-free punching process consisting of mechanical half piercing and hydro counter punching.…”

Section: Introductionmentioning

confidence: 99%

Punching process including thickening of hole edge for improvement of fatigue strength of ultra-high strength steel sheet

Kadarno

Mori

Abe

et al. 2014

Manufacturing Review

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-A punching process including thickening of a hole edge of an ultra-high strength steel sheet with a taper punch and step die was developed to improve fatigue strength of the punched sheet. In this process, the sheet was punched by the bottom of the punch, and subsequently the hole edge was thickened by the taper of the punch and the corner step of the die. The taper angle of the punch and the step height of the die were optimised to increase the amount of thickening. The quality of the sheared edge for the thickened punched sheet was improved by ironing with the taper of the punch, and compressive residual stress was generated around the hole edge. Seizure on the surface of the punch was prevented by VC-coating for repeated punching and realistic punching speed. It was found that the present punching process including thickening is effective in improving the fatigue strength of the punched ultra-high strength steel sheet and in preventing occurrence of delayed fracture.

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Influence of punch shape on geometrical profile and quality of hole piercing-flanging under high pressure

Liu

Jing

Liu

et al. 2016

Int J Adv Manuf Technol

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An investigation of step taper-shaped punch in piercing process using finite element method

Cited by 24 publications

References 4 publications

Finite element analysis of flange-forming direction in the hole flanging process

Finite element analysis of flange-forming direction in the hole flanging process

Punching process including thickening of hole edge for improvement of fatigue strength of ultra-high strength steel sheet

Influence of punch shape on geometrical profile and quality of hole piercing-flanging under high pressure

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