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Reasons for pin holes formation in ductile iron castings
Opačitý, Radim ; Palán, Petr (referee) ; Šenberger, Jaroslav (advisor)
The aim of this thesis was to analyze the formation of defects in a given casting of ductile cast iron EN - GJS - 600-3 cast in sand molds bentonite, which is formed jolting with coining and then find a solution to remedy these defects. To resolve this issue, the influence of the composition of the sand mixture, the effect of metal flow in a cavity forms and the influence of deoxidation of metal in the presence of defects. Obtained results showed the importance of the influence Reoxidation metal cavity mold. Specifically, in this case succeeded in reducing the incidence of PINHOLES. Removal of PINHOLES to achieve deoxidation aluminum melt. This has reduced the production of nonconforming castings under 3% from the original 6.5%.
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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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Reasons for pin holes formation in ductile iron castings
Opačitý, Radim ; Palán, Petr (referee) ; Šenberger, Jaroslav (advisor)
The aim of this thesis was to analyze the formation of defects in a given casting of ductile cast iron EN - GJS - 600-3 cast in sand molds bentonite, which is formed jolting with coining and then find a solution to remedy these defects. To resolve this issue, the influence of the composition of the sand mixture, the effect of metal flow in a cavity forms and the influence of deoxidation of metal in the presence of defects. Obtained results showed the importance of the influence Reoxidation metal cavity mold. Specifically, in this case succeeded in reducing the incidence of PINHOLES. Removal of PINHOLES to achieve deoxidation aluminum melt. This has reduced the production of nonconforming castings under 3% from the original 6.5%.
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|
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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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