Isostatic Pressing
There are two ways of isostatic pressing, one is to heat the extruded or molded raw product to a certain temperature and put it into the isostatic pressing mold; the other is to put the prepared powder into the mold. The mold filled with materials is placed in a sealed high-pressure tank, and the pressure is uniformly pressurized in the high-pressure tank, and the pressure is generally 100-200MPa. Isostatic pressing has the lowest production efficiency, but can produce finished graphite with better isotropy. Vibration molding is generally a molding method for producing aluminum carbon products or large-scale graphite electrodes and carbon electrodes. At present, it can also be used to shape special graphite. Because vibration molding equipment is relatively simple and the purchase price is low, it has become the first choice of some small special graphite factories. Main molding equipment.
Isostatic pressing
The molding process of isotropic graphite is mostly changed from compression molding to isostatic pressing. Hydraulic isostatic pressing equipment is mainly composed of elastic molds, high-pressure vessels, frames and hydraulic systems. Elastic molds are generally made of rubber or resin synthetic materials. The size and shape of material particles have a great influence on the life of elastic molds. Mold design is a key technical issue in hydroisostatic pressing. Elastic molds are closely related to the size and homogeneity of products. . Most of the high-pressure vessels are thick-walled metal cylinders processed by machine tools after direct casting of high-strength alloy steel. Around the reinforced cylinder, etc. The hydraulic system is composed of low-pressure pump, high-pressure pump, supercharger and various valves. At the beginning, the low-pressure pump with larger flow supplies oil, and after reaching a certain pressure, the high-pressure pump supplies oil, and the supercharger further increases the pressure in the high-pressure container. liquid pressure.
Wet bag cold isostatic press
This method hangs the mold in a high-pressure container, and several molds can be loaded according to the size of the product, which is suitable for products with small batches, small sizes and complex shapes. The production of carbon products mainly uses wet bag method cold isostatic press.
Dry bag cold isostatic press
This method is suitable for products with large size and large production volume. At this time, the cold isostatic press equipment is also different from the cold isostatic press used in the wet bag method. The pressure punch, stopper and ejector are added. This method fixes the elastic mold in the high-pressure container and uses the stopper to position it, so it is also called the fixed mold method. During production, the powder is loaded into the mold with a pressure punch and the upper opening is closed. When pressurizing, the liquid medium is injected into the periphery of the elastic mold in the container to pressurize the mold. It is not necessary to take out the mold when demolding, and the formed green body is ejected by the ejector mechanism, and this kind of isostatic pressing equipment is often used for mass production of special refractory materials.
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