Publications by authors named "Karel Gryc"
The article focuses on the issue of improving the efficiency of a Foundry Degassing Unit (FDU) via operational testing of aluminium alloys during casting at MOTOR JIKOV Slévárna a.s..
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- The study focuses on using physical modeling to explore how inert gas injection via rotors impacts the aluminum refining process, testing two distinctly designed industrial impellers.
- Researchers varied key factors like gas flow rate, rotor speed, and rotor height, investigating their effects on the performance of both new and worn rotors.
- Findings revealed that worn impellers were more effective at removing hydrogen from the liquid, and additional metallographic analysis was conducted to confirm the model test results based on industrial parameters.
Article Synopsis
- The article discusses the importance of sustainable methods for obtaining metallic materials, particularly aluminium and its alloys, to support environmental conservation and resource management.
- It highlights a common refining technique that involves blowing inert gas into liquid aluminium using a rotating impeller, emphasizing the need for optimal flow rates and rotor speeds to improve efficiency and reduce costs.
- The research presented involves physical modeling to identify the best ratios of inert gas flow rate to impeller speed, analyzing the dispersion of gas bubbles and the rate of oxygen removal in the refining process.
One of the most important indicators of casting quality is porosity. The formation of pores is largely conditioned by the presence of hydrogen in the batch and subsequently in the melt. The gasification of the melt is the primary factor increasing the porosity of casts.
View Article and Find Full Text PDFThe paper presents the results of tests carried out during the refining of the AlSi9Cu3(Fe) alloy in industrial conditions at the FDU stand. In the tests, three different rotors made of classical graphite, fine-grained graphite and classical graphite with SiC spraying were tested for the degree of wear. A series of tests was conducted for five cases-0% to 100% of consumption every 25%-corresponding to the cycles of the refining process.
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