Aluminum Casting Products pouring temperature

Although aluminum casting temperature is about 700

, but actually look like liquid metal contact parts with the temperature not exceed 500 . The temperature range is exactly the gasification of polystyrene decomposition region. At this point, look like material into gas and liquid, while the formation of a small amount of combustion products CO and CO2. Therefore, in the casting of aluminum or other low melting point alloys do not produce black smoke, only the white mist of gas through the sand, and riser precipitation. Under reasonable conditions, Aluminum Casting, one could not due to surface defects caused by decomposition products of traces of mold that is cast Aluminum Casting polystyrene surface do not appear similar to the iron and steel castings as the surface defect. However, as polystyrene decomposition products of the interaction between gas and liquid aluminum to the surface of Aluminum Casting silver lost its original luster.

It should be noted, poly ethylene in the temperature range of Coach Bags, there is no cracking burning phenomenon. In addition, look at the casting process the liquid aluminum alloy material to draw from a lot of heat (699 kJ / kg) for the decomposition of gasification, unlike cast iron cast steel or aluminum, as a lot of heat release associated with combustion (18 630 kJ / kg) to compensate for heat loss due to gasification. This will inevitably result in contacts with the appearance of the transition office alloy cooling, so that part of the liquid phase decomposition gasification too late, but the concentration or pressure in the metal surface on the wall to the type and form of cold wall, subcutaneous gasification or other defects. However, the aluminum pouring temperature is too high is not allowed. As easily lead alloy suction to reduce the mechanical properties of castings. To do this, select the appropriate casting temperature and casting speed on the obtained quality Aluminum Casting is very important.

Aluminum Casting vibration parameters should be based on the structure and model to choose the form of clusters, for most castings, generally should be used one-way vertical vibration, the more complex castings for the structure, the level of vibration can be considered one-way or two-dimensional and three-dimensional vibration. Vibration amplitude of a great influence on the dry sand molding, with acceleration that vibration intensity. For the general complexity of the cNeedle Valve and model cluster, acceleration between the 10 ~ 20m/s2. The amplitude is the impact of model to maintain a certain rigidity of the important vibration parameters, the amplitude of EPC is generally 0.5 ~ 3mm. More subtle vibration timing, casting and model should be combined with cluster structure selection. But the overall control of vibration for about 10 to 30 seconds is appropriate. While the bottom sand, half buried cluster model the vibration time is shorter as far as possible, all embedded cluster model of time after the vibration are generally longer.

Aluminum Casting Products pouring temperature

By: qingyang745

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