Investigations on hole-flanging by paddle forming and a comparison with single point incremental forming

Besong, Lemopi Isidore; Buhl, Johannes; Bambach�, Markus

doi:10.1016/j.ijmecsci.2019.105143

Cited by 22 publications

(5 citation statements)

References 35 publications

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“…Shear due to tool rotation also increases formability [14]. This is demonstrated by a slight twist along the flange length and finite element analysis of the process [10]. The increase in formability of the steel at high temperatures is attributed to softening of the steel as the energy needed to activate slip planes within grains of the material is reduced and the material can be deformed without failure.…”

Section: Results Of Hot Tensile Testsmentioning

confidence: 99%

“…Besong et al [10] introduced high-speed tool rotation to conventional hole flanging of 0.8mm thick Aluminum EN AW-6181-T1 blanks to reduce equipment cost and process time associated with heating the blanks in existing hot hole flanging process variants. The self-stabilising nature of axisymmetric tool rotation permits high-speed rotation with negligible kinematic effects acting on the machine tool.…”

Section: Introductionmentioning

confidence: 99%

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Increasing the Forming Limits in Hole Flanging of Dual-Phase (DP) 1000 Steel Using Punch Rotation

Besong

Buhl

Härtel

et al. 2022

KEM

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Dual-phase (DP) steels are widely used in sheet metal stamping. However, they are typically characterized by low hole expansion ratios. Since hole flanging is very often applied to sheet metal parts, solutions for improving hole flangeability are needed. In this study, high-speed punch rotation is applied in hole flanging of DP 1000 to generate frictional heat and increase formability. The flanges were formed using a punch rotating at 8000 rev/min and varying axial feeds. A maximum hole expansion ratio (HER) of 3.6 is obtained in the tests compared to ~1.58 in conventional hole flanging. The high formability is explained by the high temperature recorded in the process. The effects of temperature and strain rate on the formability of DP 1000 are examined by tensile tests conducted at different conditions. The tensile tests show an increase in formability at high temperatures. Optical microscopy at the flange edge reveals a change in the microstructure of the steel from the characteristic dual phase to a martensitic structure with elongated grains.

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Section: Results Of Hot Tensile Testsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Increasing the Forming Limits in Hole Flanging of Dual-Phase (DP) 1000 Steel Using Punch Rotation

Besong

Buhl

Härtel

et al. 2022

KEM

Self Cite

View full text Add to dashboard Cite

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“…In the articles [7,8,9] it is shown in detail, on specific examples, that the results of calculations of hole diameter for flanging according to the above formulas have significant differences among themselves. At the same time, as stated, the condition of volume constancy is not followed, what does not allow building a three-dimensional model of the workpiece and using modern methods to analyze its stress-strain state in the deformation process and assess the strength of finished products.…”

Section: Methodsmentioning

confidence: 99%

Determination of technological parameters and tool for flanging holes from sheet blanks

et al. 2020

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In the article the parameters of shaping operations of internal axisymmetric cylindrical flanging are considered. The article is written to improve the quality and speed of flanging round holes development from sheet blanks and tooling construction by increasing the accuracy of hole diameter calculation for flanging in the automated mode of building three-dimensional models of workpiece and a flanged product. Given formulas increase the accuracy of hole diameter calculation for flanging, taking into account the deformed condition of the sheet blank. The accuracy of the hole diameter calculation for flanging according to the given formulas is determined by comparing the mass of the workpiece with the mass of the flanged part. CAD system algorithm for automated construction of the flanged parts sketch and determination of technological parameters is implemented. The parameterized scheme of a typical construction of a flanging stamp is presented. The constructed schemes allow making changes in their parameters and providing automatic representation of calculation results and also their correct graphic interpretation. Discussion of the article results allows drawing conclusions about correctness of the given mathematical model and its applicability for the automated construction of three-dimensional models of the flanged details that will allow simplifying technological development and constructed documentation with simultaneous increase of their accuracy and reducing costs of production preparation.

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“…Many recent studies have used these common specimens. 30,[34][35][36][37][38][39][40][41][42][43][44][45][46] However, few other more complex parts have been studied. For example, the incremental forming of a spherical cavity, 47 used to analyze the effects of geometrical parameters on the mechanical properties of parts manufactured by incremental forming.…”

Section: Studied Partsmentioning

confidence: 99%

The incremental sheet forming; technology, modeling and formability: A brief review

Said

2022

Proceedings of the Institution of Mechanical Engineers, Part E:

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The constant need to improve manufacturing processes and production methods, with the aim of making these processes more flexible and precise, and subsequently solving problems of conformity, quality of manufactured parts and productivity, drives manufacturers to develop original manufacturing techniques. The incremental sheet metal forming process, one of these novel techniques, has attracted a great deal of attention in recent decades. This paper presents a review of recent work done in this area and captures ideas for future work based on studies conducted by several researchers. A review of advanced investigations considering the following terms of interest: process, tools, formability, modeling and simulation is developed. Overall, it can be said that ISF process still requires further research to exploit the fabrication of new materials such as novel nanocomposites and Functionally graded materials (FGM). Test the performance of 4- and 5-axis CNC machines to manufacture industrial parts. Finally, apply new hybrid technics at the aim to improve the geometric accuracy, formability and the productivity of ISF process.

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Investigations on hole-flanging by paddle forming and a comparison with single point incremental forming

Cited by 22 publications

References 35 publications

Increasing the Forming Limits in Hole Flanging of Dual-Phase (DP) 1000 Steel Using Punch Rotation

Increasing the Forming Limits in Hole Flanging of Dual-Phase (DP) 1000 Steel Using Punch Rotation

Determination of technological parameters and tool for flanging holes from sheet blanks

The incremental sheet forming; technology, modeling and formability: A brief review

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