Wyniki wyszukiwania - BazTech

1

Identification of Substitute Thermophysical Properties of Gypsum Mould

Bernat Ł., Popielarski P.

Archives of Foundry Engineering

|

2020

|

Vol. 20, iss. 1

5--8

EN

Simplifications used in simulation program codes require the use of substitute parameters in the material databases (also called apparent or substitutive). On the one hand, they formally fit into the records used in the heat flow model, porosity, properties etc. and on the other hand they should be determined in conditions most similar to the real casting-mould system. The article presents results of a research on thermophysical parameters of gypsum mould used for precision casting moulds. Experiments were carried out on a cylindrical mould made of Plasticast gypsum, in which the heat source was a cylinder filled with liquid aluminium alloy of the temperature of 655°C. Energetic validation was carried out by using the NovaFlow&Solid ver. 6.3 simulation code. As a result of validation tests, substitute thermophysical parameters of gypsum were determined. For determined parameters, best-fit of solidification time from the experiment and simulation was obtained and the curves of gypsum mass heating were satisfactorily recreate.

2

The Use of Rapid Prototyping Methods to Perform Flexible Pattern Mold for Compressor Turbine Casting in the Gypsum Molds

Wańczyk K., Gil A., Kowalski P.

Archives of Foundry Engineering

|

2015

|

Vol. 15, iss. 3 spec.

95--98

EN

There are many different casting technologies and their selection depends on the criteria to be met by a cast made. One of the less frequently used precision casting technology is a technology that uses gypsum block forms. From many years are available pre-mixed gypsum for the various alloys, and mold making technology itself can be based on melted wax models or models permanent removed from the mold after hardening the gypsum mix. In case of use permanent models to produce them may be used various types of flexible materials. This solution allows you to make complicated models that can be removed from the mold only by the fact that they are flexible and at the same time capable of large elastic deformations.

3

Ocena możliwości wykorzystania w odlewnictwie gipsu syntetycznego uzyskanego podczas procesu mokrego odsiarczania spalin w energetyce

Biernacki R., Haratym R., Krzyńska A.

Archives of Foundry Engineering

|

2012

|

Vol. 12, iss. 1s

5--8

PL

Przedstawiono analizę możliwości wykorzystania w odlewnictwie gipsu odpadowego (syntetycznego) uzyskiwanego w procesie odsiarczania spalin w energetyce. Energetyka jest jednym z największych producentem SO2. W celu ochrony środowiska i obniżenia ilości zanieczyszczeń stosuje się odsiarczanie spalin metodą mokrą. W wyniku tego procesu powstaje gips odpadowy, który może być stosowany w praktyce. Przeprowadzono badania, w wyniku których określono sposoby przygotowania tego gipsu do wykonywania form odlewniczych. W artykule oceniono skład chemiczny, wytrzymałość i przepuszczalność form z uzyskanego gipsu syntetycznego, porównano je z właściwościami gipsu odlewniczego GoldStar XL oraz właściwościami form ceramicznych. Zbadano strukturę gipsów, wykonano badania na derywatografie oraz określono energochłonność procesu wytwarzania gipsu odpadowego w instalacji mokrego odsiarczania. Po analizie zebranych danych można stwierdzić, że gips syntetyczny może być używany jako materiał na formy odlewnicze. Nie obserwuje się znaczącego spadku najważniejszych właściwości, a z drugiej strony istnieje wiele dodatkowych korzyści, w tym niskie zużycie energii, obniżenie kosztów i zmniejszenie wpływu na środowisko.

EN

This article investigates possible use of waste gypsum (synthetic), recovered via flue-gas desulfurization from coal-fired electric power plants, in foundries. Energy sector, which in Eastern Europe is mostly composed from coal-fired electric power plants, is one of the largest producers of sulfur dioxide (SO2). In order to protect the environment and reduce the amount of pollution flue-gas desulfurization (FGD) is used to remove SO2 from exhaust flue gases of fossil-fuel power plants. As a result of this process gypsum waste is produced that can be used in practical applications. Strength and permeability tests have been made and also in-depth analysis of energy consumption of production process to investigate ways of preparing the synthetic gypsum for casting moulds application. This paper also assesses the chemical composition, strength and permeability of moulds made with synthetic gypsum, in comparison with moulds made with traditional GoldStar XL gypsum and with ceramic molds. Moreover examination of structure of synthetic gypsum, the investigations on derivatograph and calculations of energy consumption during production process of synthetic gypsum in wet flue-gas desulfurization were made.

4

Evaluation of synthetic gypsum recovered via wet flue-gas desulfurization from electric power plants for use in foundries

Biernacki R., Haratym R., Kwapisz J.

Archives of Foundry Engineering

|

2012

|

Vol. 12, iss. 3

5-8

EN

This article investigates possible use of waste gypsum (synthetic), recovered via flue-gas desulfurization from coal-fired electric power plants, in foundries. Energy sector, which in Eastern Europe is mostly composed from coal-fired electric power plants, is one of the largest producers of sulfur dioxide (SO2). In order to protect the environment and reduce the amount of pollution flue-gas desulfurization (FGD) is used to remove SO2 from exhaust flue gases of fossil-fuel power plants. As a result of this process gypsum waste is produced that can be used in practical applications. Strength and permeability tests have been made and also in-depth analysis of energy consumption of production process to investigate ways of preparing the synthetic gypsum for casting moulds application. This paper also assesses the chemical composition, strength and permeability of moulds made with synthetic gypsum, in comparison with moulds made with traditional GoldStar XL gypsum and with ceramic moulds. Moreover examination of structure of synthetic gypsum, the investigations on derivatograph and calculations of energy consumption during production process of synthetic gypsum in wet flue-gas desulfurization were made. After analysis of gathered data it's possible to conclude that synthetic gypsum can be used as a material for casting mould. There is no significant decrease in key properties, and on the other hand there is many additional benefits including low energy consumption, decreased cost, and decreased environmental impact.

5

Proces wysokotemperaturowego wygrzewania form gipsowych dla odlewnictwa artystycznego

Pawlak M.

Archiwum Odlewnictwa

|

2006

|

R. 6, nr 19

213-220

PL

W opracowaniu przedstawiono wyniki badań gipsowej formy blokowej stosowanej w odlewnictwie artystycznym. Badania obejmują rozkład temperatury w formie oraz ocenę zmian strukturalnych jej materiału w czasie wygrzewania wysokotemperaturowego dla formy wilgotnej i wstępnie suszonej w ciągu naturalnym.

EN

In this work the investigations of the gypsum block mould are presented. It showed the temperature profile and the structural changes of gypsum up to anhydrite II in the wet and dry test mould in firing process in the range of temperature 250-750 C.