National Repository of Grey Literature 2 records found  Search took 0.00 seconds. 
Degassing of small amounts of aluminum alloy melt
Spáčil, Ivo ; Záděra, Antonín (referee) ; Kaňa, Václav (advisor)
The 40 kg melt was degassed by two methods: Immersion of a degassing tablet in a melt by an immersion bell and an argon degassing through a lance with a porous plug. Up-gassing tablets were also used during the experiment. The method of double weighing was used for evaluation. No technically significant degassing was achieved using degassing tablets. After degassing with tablets was observed a decrease in DI (Dichte Index) value with increasing residence time. Excessive dosing of the tablet does not ensure a higher degassing effect, it only ensures a higher turbulence of the reaction. Preheating the degassing tablets before use does not affect degassing. By preheating the up-gassing tablets, their reactivity is reduced. Two immersion bells with different proportions were tested. The bells do not ensure a homogeneous dispersion of bubbles in the melt. By argon degassing through the porous plug, the melt was degassed to a value DI = 1,87 %. The consumption of argon for degassing smaller amounts of melt is higher than for degassing larger amounts of melt. Argon refining is more efficient than using tablets.
Proposition of casting technology of aluminium manifolds cast by tilt method
Spáčil, Ivo ; Kaňa, Václav (referee) ; Roučka, Jaromír (advisor)
Description of the theoretical factors for casting into metal molds. For thin-walled castings it has turned out that the most advantageous method is tilt casting. Tilt casting reduces the turbulence of the melt and reaches a directed solidification. Two molds were tested and measured for the experiment. During measuring the temperature regime was established lower temperature of the pouring basin than the other parts of the mold, which could cause a many of defects. The verification of mold technology has been performed. To achieve the accuracy of the casting, it is necessary to respect the different shrinkage according to the shape of the casting.

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