Numerical Simulations in Reconfigurable Multipoint Forming

Păunoiu, Viorel; Cekan, P.; Gavan, Eugen; Nicoarǎ, Dumitru

doi:10.1007/s12289-008-0021-4

Cited by 19 publications

(11 citation statements)

References 4 publications

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“…The process is flexible to accommodate rapid changes in product design without affecting tooling costs. Many investigations have been conducted to develop the MPF technique [1][2][3][4]. Walczyk and Hardt [1] reviewed MPF die design techniques, which include construction of the die model, clamping of the pin matrix, containment frame and load capacity.…”

Section: Introductionmentioning

confidence: 99%

“…For a given pin setup, a large number of numerical simulations are required to obtain the design shape without defects. Paunoiu et al [4] investigated the impact of the pin network type on the deformation process in MPF with a fixed configuration. Sheet thickness, stress, forming force and spring back were used as measures to evaluate the process.…”

Section: Introductionmentioning

confidence: 99%

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Optimisation of multi-point forming process parameters

Abosaf

Essa

Alghawail

et al. 2017

Int J Adv Manuf Technol

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The need for sheet metal forming using reconfigurable dies has increased due to rapid changes in part design to meet customer requirements, especially in the automotive industry. Reconfigurable dies have relatively low manufacturing cost compared with solid dies, and the same tool can be readily changed to produce different parts. Previous investigations have focused on avoiding defects without taking into account the effects of process on the quality characteristics of fabricated parts. This study investigated the influence of parameters, such as the elastic cushion thickness, coefficient of friction, pin size and radius of curvature, on the quality of parts formed in a flexible multi-point stamping die. The aim was to determine the optimum values of those parameters. Finite element modelling was employed to simulate the multi-point forming of hemispherical parts. Using the response surface method, the effects of process parameters on wrinkling, deviation from the target shape and thickness variation were investigated and the process parameters yielding the best product quality characteristics were obtained. The results show that pin size and radius of curvature have the greatest influence on wrinkling and deviation between formed and target shapes, while coefficient of friction, pin size and radius of curvature significantly affect thickness variation.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Optimisation of multi-point forming process parameters

Abosaf

Essa

Alghawail

et al. 2017

Int J Adv Manuf Technol

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“…Dentro de los moldes flexibles, los adaptativos son los que pueden tener una mayor incorporación en la industria de la de fabricación CAM. El MPF permite cambios de manera rápida y tantos paneles distintos como se requiera sin tener un molde específico (34), (35) . Esta tecnología no sólo sirve para metales, ya que existen investigaciones sobre plásticos y aerogeles (36) para conseguir la doble curvatura, en la que el sistema funciona simplemente como molde, pudiendo aplicar o no presión, como podemos observar en los moldes flexibles.…”

Section: Moldes Flexiblesunclassified

Nuevos métodos de fabricación digital de paneles de GRC de forma libre

et al. 2018

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Los paneles de forma libre de GRC son de gran aplicación en elementos de fachadas ligeras. Dichos paneles pueden fabricarse a través de una gran variedad de procesos. Sin embargo, a pesar de sus ventajas como la moldeabilidad, durabilidad y ligereza, se ven penalizados por el elevado precio de los correspondientes moldes, sobre todo si no hay una repetición suficiente de las piezas y la forma del panel difiere de lo convencional. Las nuevas tecnologías digitales permiten diversas posibilidades en el campo de la construcción y la producción de moldes con geometrías complejas. En el presente artículo se presenta una serie de métodos recientes en la fabricación de paneles de GRC de forma libre. Se discutirán ventajas e inconvenientes de dichos métodos, sobre todo la importancia del molde y su repercusión económica. Finalmente se extraerán conclusiones sobre la viabilidad técnica y las posibilidades que se abren con este análisis.

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“…They found that a large number of simulations are needed in order to achieve a defect-free design shape. Paunoiu et al [16] researched the effect of the type of the pins on the sheet deformation of sheet metals in MPF with a fixed setup in terms of thickness, developed stress and springback. They found that there is a strong correlation between the pin types and the product quality, and therefore, pin types must be selected carefully optimised.…”

Section: Introductionmentioning

confidence: 99%

Multipoint forming using mesh-type elastic cushion: modelling and experimentation

Tolipov

Elghawail

Abosaf

et al. 2019

Int J Adv Manuf Technol

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There is a growing demand for flexible manufacturing techniques that meet the rapid changes in production technology, processes and innovations. Multipoint forming (MPF) is a flexible sheet metal forming technique where a reconfigurable die can be readily changed to produce various shapes. Parts produced using MPF suffer from geometrical defects such as wrinkling, dimpling and thickness variations. In this paper, a multipoint forming process using a novel mesh-type elastic cushion was proposed in order to improve the quality of the deformed sheet and to minimise the developed defects. Finite element modelling (FEM) and design of experiments (DoE) were used to study the influence of the mesh-type elastic cushion parameters such as the type and the size of the mesh, and the thickness of the cushion on the wrinkling, deviation and thickness variations of the deformed sheet. The results showed that using elastic cushion with square meshes of a size of 3.5 mm and a thickness of 3 mm reduced the wrinkling from 3.18 to 1.98 mm, while the thickness variation improved from 98 to 19 μm. Finally, the deviation from target shape reduced from 1.7848 to 0.0358 mm.

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Numerical Simulations in Reconfigurable Multipoint Forming

Cited by 19 publications

References 4 publications

Optimisation of multi-point forming process parameters

Optimisation of multi-point forming process parameters

Nuevos métodos de fabricación digital de paneles de GRC de forma libre

Multipoint forming using mesh-type elastic cushion: modelling and experimentation

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