Precision casting at the time of production and processing for different casting will take different methods to carry on the processing, production of castings will be more quality, so precision casting iron in hot and cold processing is a kind of what kind of different style?1, precision casting, hot iron is on the casting or die head was independent of supplement the entity, or placed outside the shell body of non-metallic materials heat preservation;Can achieve in the process of casting solidification cooling, heat preservation and smooth feeding channel of castings.2, precision casting, cold iron is placed outside the casting shell metal body;Often in sand casting sand mold casting technology, sand core metal surface or placed inside cavity;Cold iron to prevent the shrinkage cavity, shrinkage porosity formation of castings, to ensure the casting quality plays a more important role.
length, width and height size with a hot iron (stick), cold iron.E = "Verdana" > 800 ℃ to 1200 ℃, and between the three kinds of materials use temperature rise in turn.Low plasticity, high brittleness is iron chromium aluminum is the chief drawback of electrothermal alloy material, especially between 400 ℃ to 800 ℃, use for a long time can make the material in precipitation "CrFe" type metal compounds, lead alloy plastic fell sharply, appear serious embrittlement phenomenon, so iron chromium aluminum series electric heating alloy material to avoid forming in this temperature region and use.Surface load refers to the unit surface area on the electric heating element for electrical values.The surface of the material using load intensity is higher, shorter service life of the material, but also the consumption of materials of the smaller.So, reasonable choice of components heat load intensity, the electric heating element has high thermal efficiency, long service life, the comprehensive effect of saving material.