23 2月 Ceramic Filters Foundry India
Ceramic Filters Foundry India removes the non-metallic inclusions in the aluminum alloy melt and adopts the furnace flux treatment. The technology of ceramic foam filtration outside the furnace has long become an important method for the purification of molten aluminum.
Reflected in the alloying, purification, and refinement processing technology of the smelting process. The smelting of aluminum alloy is the first step in the aluminum alloy processing process, and it is also a crucial link.
Aluminum rod casting
Aluminum alloy profiles are divided into industrial aluminum and civil aluminum. The composition of aluminum alloys for different purposes is different. Before the extrusion of the profile, the aluminum profile needs to be cast with an alloy aluminum rod that matches the purpose.
The specific aluminum rod casting process is as follows
a. Purchase of pure aluminum and aluminum ingots.
b. Alloy casting, melting the pure aluminum aluminum ingot in a melting furnace, then adding other alloy components, and then pouring it into the grinding tool to cool and shape to form the alloy aluminum rod to be extruded.
Ceramic Filters Foundry India is a porous ceramic product with an open porosity of 80-90% and a bulk density of only 0.3-0.6gcm”. It has a unique three-dimensional network framework and interpenetrating pore structure.
The foam ceramic filter plate filters and removes impurities, which can significantly improve the quality of ingots and reduce the waste rate. Since then, the corresponding research and development of ceramic foam filter materials have been promoted in the metallurgical industry.
Common problems of aluminum alloy
1. The surface of the ingot is uneven, with many honeycomb holes and cracks
A. When the silicon content of the alloy reaches about 12%, the crystallization temperature interval of the alloy becomes narrow, and shrinkage cavities and shrinkage porosity will occur on the top of the ingot during solidification.
This is caused by the nature of the alloy itself, which is the characteristic of eutectic silicon aluminum alloy. ADC-12 alloy especially produces this phenomenon. When the silicon content is below 10.5%, cracking will not occur.
B. The shaking (vibration) of the conveyor belt accelerates the solidification of the alloy liquid, resulting in an increase in shrinkage cavities, shrinkage porosity, and honeycomb-shaped pores. This is caused by external factors and has no effect on the internal quality.
C. It is closely related to the ratio of raw and cooked raw materials.
2. The thick molten soup has poor fluidity and is difficult to die-cast. If it is heated again, it is easy to overheat
The ceramic foam filter mechanism is generally described as diffusion interception and inertial collision interception or screening, sedimentation and deep bed filtration.
The State Key Laboratory of Tsinghua University established a three-dimensional physical model and a two-phase flow model for the filtration mechanism of ceramic foam, and carried out simulation calculations, which is very helpful for our research on the filtration and purification of molten aluminum.
However, the process of filtering and purifying molten aluminum by foam ceramics is very complicated, and it is also a complicated process of high temperature physical chemistry and metallurgical dynamics. As for screening collision, settlement, interception and filtration, it is better to understand.
Correctly choose Ceramic Filters Foundry India to improve the cleanliness of aluminum melt
1. The selection of Ceramic Foam Filters For Casting is first determined according to the impurity content in the aluminum melt and the transfer flow rate of the melt to the quality requirements of the final cast product.
①There is a large amount of impurities and the quality of the casting products is average. A foam ceramic filter plate with a larger mesh can be selected, and a glass cloth coarse filter is added in front of the filter plate. At this time, it is important to filter the semi-continuous casting with glass cloth first. It can intercept the flow slag when the eye is opened and the slag washed down by the launder to prevent clogging of the filter plate.
②The quality requirements of the casting products are high, and the new type of foam ceramic filter with small hole mesh, that is, large mesh number, is selected.
2. When choosing a filter plate, you should also watch the color, take pictures and burn the objects.
① The color is pure and free of impurities, indicating that the material is uniform. The hands are not sticky, indicating that the surface is not sprayed with adhesive and will not cause secondary pollution.
②Holding the filter plate with one hand, and clapping the filter plate with the other hand, the ceramsite slag is continuously dropped, indicating that it is a poor quality filter plate, which will cause secondary pollution of the aluminum liquid.