Topic
Forming processes
About: Forming processes is a research topic. Over the lifetime, 10158 publications have been published within this topic receiving 98704 citations.
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TL;DR: An Al-3% Mg-0.2% Sc alloy was fabricated by casting and subjected to severe plastic deformation through equal-channel angular pressing to a strain of ~8.2?m and increased to?1.1?m when holding at 673 K for 10 min this article.
273 citations
TL;DR: In this paper, a review of the state of the art in micro forming of metals is given, where scaling effects occur in tribological aspects like the friction coefficient, which increases with decreasing specimen size.
Abstract: Micro forming is an appropriate technology to manufacture very small metal parts, in particular for bulk production, as they are required in many industrial products resulting from microtechnology. This paper gives a review of the state of the art in micro forming of metals. The occurring problems in miniaturisation of forming technologies like micro massive forming and micro sheet metal forming are described. One of the problems are scaling effects, which, e.g. occur in tribological aspects like the friction coefficient, which increases with decreasing specimen size. Scaling effects do not only appear within the process but must be taken into account in all other areas of the forming process chain, demanding finally new solutions especially on tool manufacturing and machine concepts.
250 citations
TL;DR: In this paper, a set of coupled viscoplastic constitutive equations for deformation and damage in hot stamping and cold die quenching of AA6082 panel parts are introduced.
Abstract: This paper introduces a set of coupled viscoplastic constitutive equations for deformation and damage in hot stamping and cold die quenching of AA6082 panel parts The equation set can be used to predict viscoplastic flow and plasticity-induced damage of AA6082 under hot forming conditions Deformation and damage depend upon a coupled set of evolving internal state variables, eg dislocation density, which in turn is affected by thermally activated and deformation-dependent recrystallisation and recovery A phenomenological description of damage is derived based on the expected physical scaling with temperature, strain and strain rate The resulting equations were implemented in the commercial software ABAQUS via the user-defined subroutine VUMAT for carrying out forming process simulations An experimental programme was designed, and specialised testing facilities developed for calibrating and validating the FE process modelling results A good agreement between the process simulation and the experimental results has been achieved This confirms that the physical dependencies in the constitutive equations are correctly formed, and that the equations and FE model can be calibrated and used for hot stamping of AA6082 panel parts Further, forming process optimisation was carried out using the model to identify the optimal forming parameters for a basic panel part with a circular hole in the middle The study concludes with a discussion of the potential impact of the constitutive model, experimental characterisation and modelling results on AA6082 panel parts manufacture
247 citations
TL;DR: In this article, a closed-form theoretical analysis of the fundamentals of single point incremental forming is presented, which is based on membrane analysis with bi-directional in-plane contact friction and is focused on the extreme modes of deformation that are likely to be found in singlepoint incremental forming processes.
244 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