Topic
Material flow
About: Material flow is a research topic. Over the lifetime, 3050 publications have been published within this topic receiving 36844 citations. The topic is also known as: material stream.
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TL;DR: In this paper, all production steps in the manufacture of disks made of SAE 5120 prior to heat-treatment were analyzed by means of design of experiments (DoE) and the influence of hardenability, pre-heat treatment, forging temperature, and feed rate and partition of material removal in cutting on the distortion of disks were investigated.
Abstract: In order to minimize shape deviations in hardening of gear wheels, all production steps in the manufacture of disks made of SAE 5120 prior to heat-treatment were analyzed by means of design of experiments (DoE). The influence of hardenability, pre-heat treatment, forging temperature, and feed rate and partition of material removal in cutting on the distortion of disks were investigated. Standard case hardening of the disks led to a characteristic shape change called “dishing”. The statistical analysis of the test results has proven that dishing of disks is mainly affected by the partition of the material removal in the considered case. In additional experiments dishing could be eliminated (on average) by an optimized partition of the material removal. However, results from experiments with spray-formed disks and with disks using a different forming strategy imply that the material flow combined with material inhomogeneities are the physical causes for dishing rather than the partition of material removal.
49 citations
TL;DR: The new "Dynamic Probabilistic Material Flow Analysis (DPMFA)" method, combining dynamic material flow modeling with probabilistic modeling, is presented in this paper and is implemented as a simulation framework in Python to support experts from different domains in the development of their application models.
Abstract: Material flow modeling constitutes an important approach to predicting and understanding the flows of materials through the anthroposphere into the environment. The new "Dynamic Probabilistic Material Flow Analysis (DPMFA)" method, combining dynamic material flow modeling with probabilistic modeling, is presented in this paper. Material transfers that lead to particular environmental stocks are represented as systems of mass-balanced flows. The time-dynamic behavior of the system is calculated by adding up the flows over several consecutive periods, considering changes in the inflow to the system and intermediate delays in local stocks. Incomplete parameter knowledge is represented and propagated using Bayesian modeling. The method is implemented as a simulation framework in Python to support experts from different domains in the development of their application models. After the introduction of the method and its implementation, a case study is presented in which the framework is applied to predict the environmental concentrations of carbon nanotubes in Switzerland. Presentation of a probabilistic modeling method for representing dynamic mass flows.Implementation as simulation framework.Case study: Exposure modeling of carbon nanotubes for Switzerland.
49 citations
TL;DR: In this paper, a conceptual balanced-flow model and a plastic material flow model were used to describe the material flow behavior, and the origin of the downward material flow in the advancing side was discussed.
Abstract: Material-flow behavior during friction-stir welding of 6082-T6 aluminum alloy has been visualized by marker insert technique. Four stacked layers were evolved in welding nugget zone (WNZ) in the transverse section. The material-flow behavior in vertical direction was detected by observing the distribution of Cu foil fragments and Al-Cu intermetallic compounds. The downward and upward flows encounter each other at the advancing side in the material depositing process, changing the morphology of WNZ. A conceptual balanced-flow model and a plastic material-flow model were used to describe the material-flow behavior, and the origin of the downward material flow in the advancing side was discussed. The excess-material flow derived by the welding tool due to the existence of the tilt angle is crucial to the weld formation.
49 citations
Patent•
14 Mar 2007TL;DR: In this article, a heat-resistant partition for regulation of bed material flow is arranged between positions I and II of a downcomer 12 of a separator 8 and of a supply flow passage 25 in plane of a fluidized bed gasification furnace.
Abstract: A fluidized bed gasification system is provided in which bed material and raw material are passed throughout a fluidized bed gasification furnace so that raw material is gasified with higher gasification efficiency to improve gasification productivity. A heat-resistant partition 32 for regulation of bed material flow is arranged between positions I and II of a downcomer 12 of a separator 8 and of a supply flow passage 25 in plane of a fluidized bed gasification furnace 2. As a result, the bed material introduced via the downcomer 12 is directed to a supply flow passage 25 through a circuitous flow passage 33 throughout the fluidized bed gasification furnace 2 defined by the heat-resistant partition 32.
48 citations
TL;DR: Wang et al. as mentioned in this paper investigated the folding defect formation and avoidance in axisymmetrical flanged parts via FEM simulation based on the simulated material flow behavior, the defect formation mechanism is revealed and an avoidance mechanism through the dynamic change of tooling geometry is proposed The mechanism is realized by implementation of a sliding insert in die structure to control material flow and further to avoid the formation of folding defect.
48 citations