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Evaluation of porosity in gravity - cast Al - alloy castings
Staňková, Markéta ; Nová, Iva (referee) ; Čech, Jaroslav (advisor)
Solving of this diploma thesis is evaluation porosity in sequence on mechanical properties from different Al alloys. Castings were made by gravity casting to the iron-mould or gravity casting to the sand. Measurements (mechanical properties, porosity, DAS - dendrite arm spacing, shape factors and sphericity) were statistically analysed and dependencies which were detected were processed to the graphs.
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Costs reduction in production of Al-alloy castings
Nováková, Lucie ; Lána, Ivo (referee) ; Roučka, Jaromír (advisor)
This thesis deals with solving the most serious internal defects in castings made of aluminum alloys which are cast in sand molds in Slévárna a modelárna Nové Ransko Ltd. The problem solving contains a description of the problematic castings with the investigation of the structure and phases and subsequent detailed analysis of their production. The Author of this thesis also examines the influence of Fe and Mn on a possible formation of the internal porosity with the help of test meltings with the evaluation of the internal structural change. The Author’s design solution is a close checking of chemical composition with regard to the ratio Mn / Fe present in the alloy, the purchase of Foundry Degassing Unit to reduce gassiness of melted metals and better control of gassiness with the help of the appropriate equipment for the density Dichte index.
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Processes leading to achievement of higher surface quality of steel castings
Tomková, Jana ; Veselý, Pavel (referee) ; Záděra, Antonín (advisor)
The subject of this thesis is to verify effect of aluminium powder in ground refractory coatin, which is intended for casting od steel castings to organic bonded moulds. The pre-sence of aluminium powder in ground coating was expertised on term of coating in itself - that means immunity to heat shock, penetration etc., and in term of influence on formation of surface defects etc. Outputs of this thesis are: setting of optimum amount of aluminium powder in ground coating and statistically verified analysis of effects of modified coating in term of creation of defects
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Costs reduction in production of Al-alloy castings
Nováková, Lucie ; Lána, Ivo (referee) ; Roučka, Jaromír (advisor)
This thesis deals with solving the most serious internal defects in castings made of aluminum alloys which are cast in sand molds in Slévárna a modelárna Nové Ransko Ltd. The problem solving contains a description of the problematic castings with the investigation of the structure and phases and subsequent detailed analysis of their production. The Author of this thesis also examines the influence of Fe and Mn on a possible formation of the internal porosity with the help of test meltings with the evaluation of the internal structural change. The Author’s design solution is a close checking of chemical composition with regard to the ratio Mn / Fe present in the alloy, the purchase of Foundry Degassing Unit to reduce gassiness of melted metals and better control of gassiness with the help of the appropriate equipment for the density Dichte index.
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Processes leading to achievement of higher surface quality of steel castings
Tomková, Jana ; Veselý, Pavel (referee) ; Záděra, Antonín (advisor)
The subject of this thesis is to verify effect of aluminium powder in ground refractory coatin, which is intended for casting od steel castings to organic bonded moulds. The pre-sence of aluminium powder in ground coating was expertised on term of coating in itself - that means immunity to heat shock, penetration etc., and in term of influence on formation of surface defects etc. Outputs of this thesis are: setting of optimum amount of aluminium powder in ground coating and statistically verified analysis of effects of modified coating in term of creation of defects
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Evaluation of porosity in gravity - cast Al - alloy castings
Staňková, Markéta ; Nová, Iva (referee) ; Čech, Jaroslav (advisor)
Solving of this diploma thesis is evaluation porosity in sequence on mechanical properties from different Al alloys. Castings were made by gravity casting to the iron-mould or gravity casting to the sand. Measurements (mechanical properties, porosity, DAS - dendrite arm spacing, shape factors and sphericity) were statistically analysed and dependencies which were detected were processed to the graphs.
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