Influence of some relevant process parameters on the dimensional accuracy in incremental forming: a numerical and experimental investigation
TL;DR: In this article, an integrated numerical/experimental procedure is proposed in order to limit the shape defects between the obtained geometry and the desired one, with the aim to quantify the geometrical discrepancies.
About: This article is published in Journal of Materials Processing Technology.The article was published on 2004-11-10. It has received 174 citations till now. The article focuses on the topics: Forming processes & Formability.
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TL;DR: Asymmetric Incremental Sheet Forming has the potential to revolutionize sheet metal forming, making it accessible to all levels of manufacturing as discussed by the authors, and has been shown to be a state-of-the-art in sheet metal manufacturing.
973 citations
TL;DR: In this paper, the deformation mechanism of incremental sheet forming (ISF) is examined experimentally through forming specially prepared copper sheets, and the authors measured the strain distributions through the thickness of the sheets are measured for two configurations of ISF: two-point incremental forming (TPIF) and single point incremental forming(SPIF).
330 citations
TL;DR: In this article, a particular application is carried out taking into account the development of an innovative technique to produce a customised ankle support, exalting the role that this technology may play when single complex product has to be manufactured.
269 citations
Cites background from "Influence of some relevant process ..."
...In this contest, a previous work of the authors has shown hat it is possible to improve the geometrical accuracy of the nal product, reducing the discrepancies up to the 70%, with proper selection of these parameters [4]....
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...More in detail, in this kind of application but, in general, in all the operations in which Incremental Forming processes are involved, one of the main drawbacks is represented by the discrepancies between the desired shape and the obtained one [4]....
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TL;DR: In this article, a wide recognition of the research efforts in this field is presented, taking into account some general considerations on the difference sources of shape and dimensional errors, as well as the influence of the most relevant parameters.
228 citations
TL;DR: In this paper, the authors presented an innovative and viable method to test the thinning limits of sheet metals in Negative Incremental Forming along with verification of the Cosine's law of thickness distribution.
Abstract: Single Point Incremental Forming (SPIF) is an emerging sheet-metal-forming technology, capable of manufacturing complex parts at low cost for small to medium-batch production. The present paper is focused on presenting an innovative and viable method to test the thinning limits of sheet metals in Negative Incremental Forming along with verification of the Cosine's law of thickness distribution. The Cosine's law was verified by comparing the experimentally measured thicknesses of incrementally formed parts with those predicted by the law. To test the thinning limit of a sheet metal, the idea is based on the forming of an axi-symmetric part varying its slope with depth corresponding to varying thinning. An arc of a circle was selected as generatrix to model such an axi-symmetric part. Based on the Cosine's law, mathematical expressions were derived to predict the thickness distribution along the depth of the part and the thinning limit of the sheet-metal. The Aluminum sheet metal was used as an experimental material. In order to test its thinning limit, the axi-symmetric part, modeled with a generatrix arc, was formed incrementally until it cracked. Thickness of the fractured part was measured at various points along its depth and compared with that predicted by the Cosine's law. The maximum thinning at a point, at which thickness followed the Cosine's law, was called the thinning limit of the sheet metal. In order to obtain accurate results, four such parts having the same generatrix design were formed. Based on these results, several axi-symmetric and asymmetric parts were formed at fixed slopes. It was found that the thinning limits obtained from the parts formed at fixed slopes were a little lower than those obtained from the parts modeled with the same generatrix design. As conclusion, a strategy to test the lowest possible thinning limits of sheet metals has been proposed. The proposed method is capable to test the thinning limits of sheet metals at reduced processing time and cost.
212 citations
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TL;DR: Specific issues addressed include characterization of geometric models and related surface representations, segmentation and surface fitting for simple and free-form shapes, multiple view combination and creating consistent and accurate B-rep models.
Abstract: In many areas of industry, it is desirable to create geometric models of existing objects for which no such model is available. This paper reviews the process of reverse engineering of shapes. After identifying the purpose of reverse engineering and the main application areas, the most important algorithmic steps are outlined and various reconstruction strategies are presented. Pros and cons of various data acquisition techniques are described with related problems of boundary representation model construction. Specific issues addressed include characterization of geometric models and related surface representations, segmentation and surface fitting for simple and free-form shapes, multiple view combination and creating consistent and accurate B-rep models. The limitations of currently known solutions are also described, and we point out areas in which further work is required before reverse engineering of shape becomes a practical, widely-available engineering tool.
1,243 citations
TL;DR: In this article, material formability in incremental forming has been investigated and several tests were developed, aimed to the achievement of different straining conditions in the material and consequently to the determination of Forming Limit Diagrams for progressive forming operations.
243 citations
TL;DR: In this paper, an incremental sheet metal forming process controlled three dimensionally by a computer has been accomplished, where a small local region of a sheet blank deforms incrementally by moving a hemispherical head tool over an arbitrary surface.
225 citations
01 Jan 1992
49 citations