2-series and 7-series aluminum alloy casting method
A technology of aluminum alloy and crystallizer, which is applied in the field of aluminum alloy casting to achieve the effect of increasing casting difficulty, reducing influence and improving cooling effect
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Embodiment 1
[0037] The occurrence of thermal cracks in aluminum castings is mainly due to the fact that the shrinkage stress of the castings exceeds the bonding force between the metal grains, and most of them occur along the grain boundaries. From the observation of the crack fracture, it can be seen that the metal at the crack is often oxidized and loses its metallic luster. The cracks extend along the grain boundaries, the shape is zigzag, the surface is wider and the inner part is narrower, and some of them penetrate the entire end face of the casting.
[0038] The crack tendency of different aluminum alloy castings is also different. This is because the greater the difference between the temperature at which a complete crystalline framework begins to form during the solidification process of cast aluminum alloys and the solidification temperature, the greater the alloy shrinkage rate and the greater the tendency to generate thermal cracks. , Even the same alloy has different tendency ...
Embodiment 2
[0055] Casting begins when the dummy tip is filled and the molten metal touches the walls of the mold. The height of the metal level in the mold plays a major role in the rate of heat transfer through the mold walls. Other factors that affect the rate of heat transfer through the mold wall are:
[0056] The condition of the inner wall of the crystallizer: the smoother the wall of the crystallizer, the less oxidation, the greater the heat dissipation through the wall of the crystallizer. For this reason, preferably, an independent oil chamber is designed on the upper cover of the crystallizer. During casting, the oil chamber continuously and automatically leaks oil to the graphite lining to increase the lubricating effect of the crystallizer. The graphite lining is made of high-strength and high-toughness graphite for casting. The graphite lining is designed with a taper, and the taper angle ranges from 174° to 179°, which can reduce the contact friction between the aluminum a...
Embodiment 3
[0086] Casting begins when the dummy tip is filled and the molten metal touches the walls of the mold. The height of the metal level in the mold plays a major role in the rate of heat transfer through the mold walls. Other factors that affect the rate of heat transfer through the mold wall are:
[0087] The condition of the inner wall of the crystallizer: the smoother the wall of the crystallizer, the less oxidation, the greater the heat dissipation through the wall of the crystallizer. For this reason, preferably, an independent oil chamber is designed on the upper cover of the crystallizer. During casting, the oil chamber continuously and automatically leaks oil to the graphite lining to increase the lubricating effect of the crystallizer. The graphite lining is made of high-strength and high-toughness graphite for casting. The graphite lining is designed with a taper, and the taper angle ranges from 174° to 179°, which can reduce the contact friction between the aluminum a...
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