Forming strategies and Process Modelling for CNC Incremental Sheet Forming

Hirt, Gerhard; Ames, J.; Bambach�, Markus; Kopp, Reiner

doi:10.1016/s0007-8506(07)60679-9

Cited by 223 publications

(119 citation statements)

References 4 publications

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“…In terms of damage evolution, the decrease of the sheet thickness (or increase of the tool radius) shifts the Mohr circle to the tensile region, thus increasing the hydrostatic stress and the accumulated damage. This result is consistent with the findings of Hirt et al (2004). The higher formability of SPIF process, compared to conventional stamping, is explained in terms of the meridional stress.…”

Section: Damage and Fracture Predictionsupporting

confidence: 92%

“…Porosity-induced damage within SPIF process has been studied, for instance, by Lievers et al (2004) and Hirt et al (2004). Lievers et al (2004) presented a novel method to identify void nucleation parameters of a Gurson model using SPIF.…”

Section: Damage and Fracture Predictionmentioning

confidence: 99%

“…Quadrangular SPIF pyramids for different aluminum alloys and wall angles were formed by Lievers et al (2004), allowing an easy measurement of porosity. Hirt et al (2004) performed a simulation of a truncated pyramid formed using multi-stage forming, using a partial die. To study the stress state, the Gurson-TvergaardNeedleman (GTN) model was used together with shell elements.…”

Section: Damage and Fracture Predictionmentioning

confidence: 99%

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Damage prediction in single point incremental forming using an extended Gurson model

Guzmán

Yuan

Duchêne

et al. 2018

International Journal of Solids and Structures

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Single point incremental forming (SPIF) has several advantages over traditional forming, such as the high formability attainable by the material. Different hypotheses have been proposed to explain this behavior, but there is still no straightforward relation between the particular stress and strain state induced by SPIF and the material degradation leading to localization and fracture. A systematic review of the state of the art about formability and damage in SPIF is presented and an extended Gurson-TvergaardNeedleman (GTN) model was applied to predict damage in SPIF through finite element (FE) simulations. The line test was used to validate the simulations by comparing force and shape predictions with experimental results. To analyze the failure prediction, several simulations of SPIF cones at different wall angles were performed. It is concluded that the GTN model underestimates the failure angle on SPIF due to wrong coalescence modeling. A physically-based Thomason coalescence criterion was then used leading to an improvement on the results by delaying the onset of coalescence.

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Section: Damage and Fracture Predictionsupporting

confidence: 92%

Section: Damage and Fracture Predictionmentioning

confidence: 99%

Section: Damage and Fracture Predictionmentioning

confidence: 99%

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Damage prediction in single point incremental forming using an extended Gurson model

Guzmán

Yuan

Duchêne

et al. 2018

International Journal of Solids and Structures

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“…Consecutive toolpaths, corresponding to virtual parts with increasing wall angles, are being executed in a multi-step procedure. Typically a large offset from the backing plate is favoured for the first passes since this allows for more bending, avoiding extreme strains near the top of the part [6][7] [8]. The aim of this paper is to further investigate the mechanics behind the multi-step forming approach to contribute to a better understanding of the material relocation mechanism underlying the enlarged process window.…”

Section: Theoretical Background and Objectivementioning

confidence: 99%

Process window enhancement for single point incremental forming through multi-step toolpaths

et al. 2008

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Single point incremental forming suffers from process window limitations which are strongly determined by the maximum achievable forming angle. Forming consecutive, intermediate shapes can contribute to a significantly enlarged process window by allowing steeper maximum wall angles for a range of part geometries. In this paper an experimentally explored multi-step toolpath strategy is reported and the resulting part geometries compared to simulation output. Sheet thicknesses and strains achieved with these multi-step toolpaths were verified and contribute to better understanding of the material relocation mechanism underlying the enlarged process window.

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“…Recently, many studies concentrated on the toolpath correction/optimisation. The ISF toolpath can be corrected by using error compensation based on trial fabrications [11], a feature-based toolpath generation strategy [12], a Multivariate Adaptive Regression splines (MARS) correction strategy [13], iterative algorithms based on a transfer function [14], and an artificial cognitive system [15]. Moreover, some in-process toolpath correction approaches were performed in SPIF based on a control strategy using spatial impulse responses of the process [16] and a MPC strategy [17].…”

Section: Introductionmentioning

confidence: 99%

Part accuracy improvement in two point incremental forming with a partial die using a model predictive control algorithm

Kearney

Wang

et al. 2017

Precision Engineering

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.Part accuracy improvement in two point incremental forming with a partial die using a model predictive control algorithm.Precision Engineering http://dx.doi.org/10. 1016/j.precisioneng.2017.02.006 This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. Research highlights: Flexible forming technologies are becoming increasingly significant with the rise of small batch and customised production in the market. work. The enhanced control algorithm is able to correct the toolpath in both the vertical and horizontal directions. In the newly-added horizontal control module, intensive profile points in the evenly distributed radial directions of the horizontal section were used to estimate the horizontal error distribution along the horizontal sectional profile during the forming process. The toolpath correction was performed through properly adjusting the toolpath in two directions based on the optimised toolpath parameters at each step. A case study for forming a non-axisymmetric shape was conducted to experimentally validate the developed toolpath correction strategy. Experiment results indicate that the two-directional toolpath correction approach contributes to part accuracy improvement in TPIF compared with the typical TPIF process that is without toolpath correction.

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Forming strategies and Process Modelling for CNC Incremental Sheet Forming

Cited by 223 publications

References 4 publications

Damage prediction in single point incremental forming using an extended Gurson model

Damage prediction in single point incremental forming using an extended Gurson model

Process window enhancement for single point incremental forming through multi-step toolpaths

Part accuracy improvement in two point incremental forming with a partial die using a model predictive control algorithm

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