Casting furnace temperature was allowed to stand generally refers to the temperature of molten metal, usually higher than the liquidus temperature of the alloy of 50 ~ 110 ℃. For the formation of a crystalline intermetallic compounds tend to be larger alloy casting temperature should be raised. Great propensity for crack alloys, such as flat LC4 type alloy ingot casting temperature can be appropriately reduced. For industrial aluminum casting temperature control in the range of 690 ~ 710 ℃, whichever is low in summer, winter, whichever is the higher value.
Improve precision casting temperature, typically liquid hole length will increase, resulting in a columnar grain structure tendency increases, the crack increase waste and increase the surface segregation surfaced ingot extent thereof. In fact, the casting temperature is increased by 30 ℃, the average temperature of the liquid cavity only increase 1 ~ 2 ℃. Liquid cavity temperature of the melt although only increase 2 ℃, but the impact on the organization and its ingot defects is great. In the production of 10mm diameter aluminum pole, because the casting speed quickly, when the casting temperature is too high, the surface prone to heavy leather Pole phenomenon, like scaly, and can not leak even solidification of molten aluminum.
Casting temperature is too low, it will lead to the expansion of the curing area of the meniscus, thus contributing to the formation of cold shuts ingot surface and increase its depth; and the volume of the order could lead crystal ingot organizations make a significant heterogeneity, reduced Mechanical properties of the ingot. When the casting temperature decreases, the width of the liquid-solid transition area becomes large, the melt viscosity increases when metal solidification exhaust and feeding conditions deteriorate, so that shrinkage, increase the oxide film and slag waste. In the production of 10mm diameter aluminum pole, although casting speed quickly, when the casting temperature is too low, the lower surface of aluminum rod is still prone to cold flow phenomenon, and even the solidification front within the asbestos board diversion into the mouth, pull them or Pole pulled off. http://www.cnwxyszj.com |
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Contact: Zhiyong Lu
Contact: Miss Ma
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