Wyniki wyszukiwania - BazTech

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Quantitative Prediction of Air Entrainment Defects in Casting Filling Process

Yin Yajun, Xie Yao, Song Yingchen, Shen Xu, Ji Xiaoyuan, Zhou Jianxin

Archives of Foundry Engineering

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2023

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Vol. 23, iss. 4

117--126

EN

Air entrainment defect is a common type of defect in the casting process, which will seriously affect the quality of the casting. Numerical simulation technology can predict the occurrence of casting defects according to the evolution law of liquid metal in the process of filling and solidification. The simulation of air entrainment process is a hot and difficult issue in the field of numerical simulation. The evolution law of air entrainment and the tracking of induced bubbles in the process of metal filling are still lacking. So is the quantitative prediction of trained gas. In this paper, based on the numerical simulation software of Inte CAST, this paper proposes an algorithm for air entrainment search and tracking, which is used to develop a quantitative prediction system for air entrainment. The feasibility of the system is verified through the simulation calculation of the typical test pieces of the air entrainment and the prediction of air entrainment defects of the casting in the process of filling is obtained through the simulation calculation of the actual casting, which can provide a certain guiding role for the optimization of the process in the production practice.

2

Model hydrauliczny zbiornika rurowego. Cz.1. Fazy napełniania

Stec A., Dziopak J.

Zeszyty Naukowe Politechniki Rzeszowskiej. Budownictwo i Inżynieria Środowiska

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2012

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z. 59, nr 2/I

219--230

PL

W pracy przedstawiono zagadnienia dotyczące regulowania spływu ścieków deszczowych i ogólnospławnych z wykorzystaniem rurowych zbiorników retencyjnych, odciążających hydraulicznie systemy kanalizacyjne. Omówiono zasadę działania innowacyjnego zbiornika rurowego, który jest przedmiotem zgłoszenia patentowego. Sformułowano jego model hydrauliczny oraz określono warunki brzegowe jego funkcjonowania w charakterystycznych fazach napełniania poszczególnych sekcji zbiornika.

EN

The work presents the issue concerning the regulation of rainwater and combined wastewater flow with the help of tubular storage reservoirs which relief hydraulically the sewage systems. Operating principle of innovational tubular reservoir, which is the subject of patent application, is discussed. The hydraulic model is presented and boundary conditions of its operating during characteristic phases of individual sections filling are specified.

3

Mathematical modeling of the filling process of a slender mould cavity

Sowa L.

Prace Naukowe Instytutu Matematyki i Informatyki Politechniki Częstochowskiej

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2010

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Vol. 9, nr 2

219-227

EN

In this paper, three mathematical models of the solidification of a thin-walled casting, which take into account the filling process of the mould cavity with molten metal, have been proposed. In the general model, velocity and pressure fields were obtained by solving the momentum equations and the continuity equation, while the thermal fields were obtained by solving the heat conduction equation containing the convection term. In the simplified models, making assumptions relating to both the material and the geometry of the region, the general equations for momentum and continuity have been reduced to single an equation for pressure. This approach leads to the essential acceleration of fluid flow computations. In this model, coupling of the thermal and fluid flow phenomena by changes in the fluidity function and thermophysical parameters of alloy with respect to temperature has been taken into consideration. The problem has been solved by the finite element method.