smelting aluminium alloy casting process, can be cast, crystallization and cooling performance is most prominent in the process of the performance of the integrated embodiment.
Liquidity, contractility, air tightness and casting stress and suction.
Aluminum alloy these features depends on the alloy composition, but also with casting factors, the heating temperature of alloy and the complexity of the mould, casting riser system, gate shape and so on.
Melting furnace melting furnace alloy casting property 1 liquidity refers to the liquid alloy liquid filling mold ability.
Liquidity can decide the size of the alloy casting complex castings.
Most liquid in the aluminum alloy crystal alloy.
There are many influence factors in liquidity, mainly exist in the composition, temperature, and alloy liquid metal oxide, metal compounds of solid phased particles and other pollutants, but the root of the external factors for pouring temperature and pouring pressure (
Commonly known as pouring head)
The high and low.
In practical production, in the case of alloy have been identified, in addition to strengthening smelting technology (
Refining and slag)
Outside, still must improve casting process (
Sand permeability, exhaust gas and metal mould temperature)
And the casting quality is not affected under the premise of increasing pouring temperature, to ensure that the alloy liquid.
2 contractility shrinkage is one of the main characteristics of the aluminum alloy casting.
Generally speaking, the alloy pouring from liquid to solidify, until cool to room temperature, which is divided into three stages, respectively, solidification shrinkage, and solid liquid contraction contraction.
The contraction of alloy has a decisive influence on casting quality, it affects the shrinkage of casting size, stress and cracks of the formation and size changes.
Usually casting line is divided into body contraction and contraction, general application in practical production line contraction to measure the contractility of alloy.
Aluminum alloy contraction size, usually expressed as a percentage, referred to as the shrinkage rate.
Of hot cracking of hot cracking of aluminum castings, mainly due to the casting shrinkage stress than the binding force between the metal grain, mostly from the fracture surface observation visible cracks along the grain boundary in metal is often oxidation, metallic luster.
Crack extended along grain boundary, the shape is zigzag, wide surface, internal narrower, others through the end of casting.
Aluminum alloy casting crack tendency is also different, this is because the cast aluminum alloy solidification process begin to form a complete framework of crystallization temperature and setting temperature, the greater the difference between the alloy shrinkage rate is, the greater the produce hot cracking tendency are, the greater the even the same kind of alloy due to the structure of the resistance of the casting, casting, pouring process factors such as hot cracking tendency are also different.
Production in rolled cast, or improving pouring system of cast aluminum alloy, the aluminum castings to avoid cracks.
Usually adopt split ring method to detect aluminum casting hot crack.
4 air tightness aluminum castings cast aluminum alloy air tightness refers to the cavity size under the action of high pressure gas or liquid leakage, air tightness actually represent the casting internal organization density and the degree of purity.
Associated with the properties of alloy cast aluminum alloy, alloy solidification range is smaller, also produce loose tendency of the smaller, at the same time generate precipitation porosity is smaller, the higher the air tightness of the alloy is.
Air tightness of the same kind of cast aluminum alloy is good or bad, but also related to the casting process, such as the lower cast aluminum alloy pouring temperature, put cold iron in order to speed up the cooling and solidification under pressure, etc. , all can increase the tightness of aluminum castings.
Impregnation method blocking leakage gap can be used to improve casting air tightness.
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