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Possibilities of pressure die casting of iron alloys

Ružbarský Juraj, Sitko Jacek

Management Systems in Production Engineering

2019

nr 4 (27)

199--204

The current trends of production of casts are directed towards production of components disposing of higher accuracy, increased quality of surface and homogenous structure. In case of a thin-walled cast the development of speed of pressing and of pressure was observed inside the mould cavity during pressure die casting of ferrous alloys. In case of die casting of ferrous alloys the attention was paid to life service of a pressing piston and of a filling chamber. The optimal temperature of the steel casting ranges from 1600 to 1750°C and optimal mould temperature ranged from 220 to 260°C. The residues having occurred in gates reached the hardness of 38 HRC and in case of casts the value was of 45 HRC. Influence of acting of resistance pressure on the thinwalled casts only minimally. With the increasing resistance pressure the structure becomes more fine-grained and along with the increasing thickness of the wall the influence of the resistance pressure increases as well. Technology of pressure die casting of iron alloys can be compared with the pressure die casting technology of aluminium alloys. As standard, for pressure die casting the cast irons with carbon content of lower than 3% are recommended.

Theory of similarity at pressure dies

Ragan E., Ružbarský J.

Archives of Foundry Engineering

2008

Vol. 8, iss. 2

121-122

We get from equations for laminar and turbulent flow criterion equations containing competent criteria without size. Two processes at pressure die casting are similar when their corresponding criteria are equal. We can introduce instead of the real flow the similar model flow. It is possible to introduce then the coefficients of size and pressure similarity for the model liquids of the alloy AlSi water, mercury, woods metal, and tin solder that is in the table.