Thermal Decomposition Behaviour of Foundry Sand for Cast Steel in Nitrogen and Air Atmospheres

Chen, Shoukun; Zhang, Jinjia; Xu, Kaili; Xu, Qingwei

doi:10.1155/2020/8121276

Cited by 3 publications

(2 citation statements)

References 51 publications

(100 reference statements)

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“…To build mathematical models of the formation of the process properties of the mixture, the regression models were used, and their parameters were determined based on the experimental data. The investigated dependencies, which were generally non-linear, were used to choose control actions [23,24].…”

Section: Resultsmentioning

confidence: 99%

Robust methods for controlling casting processes and the quality of castings

Ponomarenko,

Yevtushenko,

Yevtushenko

et al. 2023

IOP Conf. Ser.: Earth Environ. Sci.

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The paper considers the ways of controlling the processes of producing good-quality castings by using robust methods based on the identification of objects under uncertainty, adaptive control methods, stabilization methods for automatic control systems and their mathematical description. The purpose of the paper is to practically elaborate on the task of creating robust technologies for casting based on the study of the stochastic dispersion models of the casting process parameters and to develop a method for stabilizing the casting processes and a method for stabilizing the quality parameters of the castings. The regular patterns of the stochastic dispersion of the casting process parameters were investigated based on the mechanical performance of the casting alloys, their chemical composition, the physical and mechanical properties of the molding mixtures, the dimensions of the castings, and the features of the casting production process such as pouring temperature, element loss during melting and mold hardness. The results of the conducted investigations have shown that to describe the stochastic dispersion of the casting process parameters, it is appropriate to use the Johnson system of distributions. A method for stabilizing the casting quality parameters was developed. It has been shown that it is more efficient to stabilize the strength and improve the dimensional accuracy of the casting simultaneously. With the existing production process, the dimensional accuracy of the casting corresponds to Grade 11 according to GOST 26645-85. With the increase of the dimensional accuracy grade, the metal content of the casting can be reduced by 16.3% after reaching Grade 10, by 20.4% after reaching Grade 9, and by 24.2% after reaching Grade 8.

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Section: Resultsmentioning

confidence: 99%

Robust methods for controlling casting processes and the quality of castings

Ponomarenko,

Yevtushenko,

Yevtushenko

et al. 2023

IOP Conf. Ser.: Earth Environ. Sci.

View full text Add to dashboard Cite

show abstract

“…Predicted variance decomposition: e variance decomposition [27][28][29][30][31][32][33][34][35] is conducted to attribute the variance of the endogenous variables, to analyze the contribution of each structural impact to its change, and to judge the importance of the impact of different variables. erefore, the variance decomposition of the real estate price index can more clearly explore the importance of the variables affecting it.…”

Section: Model Stationarity Testmentioning

confidence: 99%

The Correlation between Monetary Policy and Housing Price Change Based on a VAR Model

Feng

2022

Mathematical Problems in Engineering

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In early 2020, the global economy was severely hit by the COVID-19 pandemic. Governments, including China, have adopted expansionary fiscal policies to stimulate demand and quantitative easing to increase the money supply to boost the economy by lowering lending rates. This paper starts from the influence of monetary policy on housing price mechanism, tries to explore the monetary policy on interest rate and money supply, finally establishes the VAR model, empirically analyzes the effectiveness of the impact of monetary policy on housing price changes, and makes a policy suggestion to demonstrate the necessity of consideration when stimulating the economy, to avoid housing price rise too fast, which affects the people's livelihood, and to have a negative impact on social sustainable development.

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The Use of Barley Malt as a Binder in Molding Sand Technology

et al. 2022

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The aim of this study was to attempt to use barley malt as a natural, organic binder in the technology of molding sand. TGA analysis of the binder was performed, during which temperatures of thermal decomposition of its components were determined. The results of TG/DTG analysis show that a loss of ~75% of mass of the MB binder is organic matter. Over 50% of this is starch. The results indicate the possibility of using a binder made of barley malt as a binding material for quartz sand grains. This fact was confirmed by tests carried out with use of SEM. During the observations, it was found that barley malt forms smooth bridges connecting individual grains of quartz sand. The typical properties of molding sands with barley malt were also determined, compared to sands containing commonly used binders. At the same time, the influence of the content of this binder on flowability, permeability, strength properties, and wear resistance was assessed. It has been found that increasing the binder content in molding mass results in an increase in strength and wear resistance, as opposed to flowability and permeability. Test castings were also made. It was found that the addition of a binder made of barley malt has a positive effect on the surface quality of castings. This was confirmed by roughness measurements of the test castings. At the same time, a tendency to excessive gas evolution during pouring was shown, with higher contents of this binder. Moreover, greater amounts of barley malt in the molding sand (MB 5%) as compared to the lower content (MB 2%) increased the thickness of the burnt layer of the sand by 25%. This is due to the exothermic reaction when more binder is burnt. It is extremely important from the point of view of the regeneration of molding sand.

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Thermal Decomposition Behaviour of Foundry Sand for Cast Steel in Nitrogen and Air Atmospheres

Cited by 3 publications

References 51 publications

Robust methods for controlling casting processes and the quality of castings

Robust methods for controlling casting processes and the quality of castings

The Correlation between Monetary Policy and Housing Price Change Based on a VAR Model

The Use of Barley Malt as a Binder in Molding Sand Technology

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