The rationality of design affects the yield of aluminum alloy die casting
Die casting technology has been widely used in the field of machinery manufacturing, among which aluminum alloy die casting has been widely used.
The application of die-casting technology in the field of mechanical manufacturing is expanding day by day, in whichaluminum alloy die-castingis widely used.
aluminum alloy die-casting has obvious characteristics. The cooling speed of aluminum liquid is fast, which has a strong chilling effect on aluminum alloy die-casting parts. The casting has fine grains, dense structure, high comprehensive mechanical properties, accurate size and smooth surface, which improves the quality and reduces the uncertainty affecting the casting quality, and is especially suitable for mass production. Good structure can reduce machining allowance and riser size. Compared with other die castings, the process yield and billet utilization rate are improved, and the casting cost is relatively reduced. Due to its flexibility, versatility and low cost, aluminum alloys still have specific advantages and occupy a certain position p>
Aluminum alloy has high thermal conductivity and small volume heat capacity. In the process of flowing, the temperature of molten metal will drop rapidly. Molten aluminum is active, easily inhaled and oxidized. If the oxide film formed on the surface is always intact during casting, it will protect the molten aluminum below from secondary oxidation. If the casting is unstable or unstable, the oxide film will be damaged, and the oxide slag on the surface will be involved in the aluminum liquid below, which is difficult to float to the surface again, and it is also difficult for various gases. Due to the similar density of aluminum and aluminum oxide, slag inclusion in the casting and high shrinkage, shrinkage cavity, pinhole, slag inclusion and other casting defects are easy to occur. Therefore, the smooth casting of aluminum alloy die castings is particularly important p>
In actual production, it is difficult to organically combine the advantages of traditional metal gravity gating system. If the filling stability (bottom injection) is emphasized, the reasonable cavity heat distribution cannot be obtained; Emphasize rationality The heat distribution of the cavity (top pouring) will lose the pouring stability. Therefore, the traditional metal mold gravity casting process has a long history of low yield and blank utilization p>