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Principle of vibration molding in carbon process
Views: 155 Update date: Jul 17,2020

In carbon process, it is sometimes required to produce large-size products, such as large-scale anode for aluminum reduction cell, carbon block for blast furnace, etc. If the extrusion process is used, the power of the extruder will be very large. This kind of large-scale extruder has complex structure, large investment, unreasonable economy, and can not suppress abnormal products. In the 1960s and 1970s, the vibration molding method was developed and applied. Under the suitable technological conditions and the parameters of vibration molding, the products meeting the quality standard can be produced by vibration molding.

 

During vibration molding, the molding mold is fixed on the vibration table, the paste is added into the mold, and the material surface is added with a small amount of pressure with a heavy hammer. After the shaking table is started, the mold and the paste in the mold are in a strong vibration state due to the strong vibration of the table. The amplitude of the vibration is small, but the frequency is high (2000-3000 times / min). -The inertia force of paste particles is produced under vibration, The inertial forces produced by them are also different, which leads to the stress on the interface of particles. When the stress exceeds the cohesive force of paste, the relative displacement of paste particles is caused. At the same time, under the strong vibration, the internal friction force between the material particles and the external friction force of the paste on the inner wall of the mold decreased sharply. The almost flowing paste quickly fills every corner of the mold. Under the action of the heavy hammer, the internal pores of the paste decreased and the density increased gradually, forming a regular appearance of the raw products.

 

The heavy hammer used in the slender products is larger than that in the thick and short products. This is because the carbon paste has a poor ability to transmit pressure. If the weight is smaller than the pressure, the pressure of the heavy hammer on the paste will decrease from top to bottom, which will reduce the density of the lower part.


 




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