Round rod casting machine crystallizer graphite ring/Graphite ring for aluminum rod casting/Oil and gas graphite ring for aluminum rod casting

Manufacturing process of graphite ring for round rod casting 1. Raw material preparation

? First, use high-quality graphite raw materials. Generally, high-purity graphite powder is used, and the purity is preferably above 99%. The particle size of these graphite powders must meet the requirements, usually between a few microns and tens of microns. For example, you can choose graphite powder of 10-30 μm, because the appropriate particle size contributes to good bonding between particles during the subsequent molding process.

? Depending on the specific needs of the product, a small amount of binder may also be added. The binder can be phenolic resin, etc. The addition amount generally accounts for about 5% - 15% of the total raw materials. The purpose is to enhance the bonding force between graphite particles so that the formed graphite ring has sufficient strength.

2. Mixing process

? Put the prepared graphite powder and binder into special mixing equipment, such as a powerful mixer. The stirring time generally ranges from 30 minutes to several hours to ensure that the graphite powder and binder are fully and evenly mixed. During the mixing process, some additives can also be added appropriately to improve the performance of the graphite ring. For example, adding antioxidants can improve the antioxidant capacity of graphite rings and extend their service life.

3. Molding process

? Compression molding: This is the more common method. The mixed raw materials are placed into a specially designed mold, which is shaped according to the final size and shape of the graphite ring. A certain pressure is applied on the press, and the pressure range is generally between tens of MPa and hundreds of MPa, such as 50-300MPa, so that the raw materials are formed in the mold. This method can precisely control the shape and size of the graphite ring and has high production efficiency.

? Isostatic pressing: For some graphite rings with complex shapes or high density and strength requirements, isostatic pressing can be used. Put the raw materials into an elastic mold and put them into a high-pressure container, and apply pressure evenly through the liquid medium, which can be as high as 100-500MPa. This method can make the graphite ring bear uniform force in all directions, thereby obtaining higher density and strength.

4. Sintering process

? The formed graphite body needs to be sintered. The sintering temperature is generally between 800 - 2800°C, depending on the type of graphite and the required properties. During the high-temperature sintering process, the binder will undergo carbonization and other reactions, and the graphite particles will be more tightly bonded, increasing the density and strength of the graphite ring. The sintering time is usually from several hours to tens of hours, such as 6 - 12 hours, to ensure sufficient sintering.

5. Machining and surface treatment

? Sintered graphite rings may need to be machined to meet precise dimensional requirements. Lathes, grinders and other equipment can be used to process the inner diameter, outer diameter and height of the graphite ring. The processing accuracy can reach about ±0.01mm.

? In order to further improve the performance of the graphite ring, surface treatment can also be carried out. For example, impregnation treatment is performed, and the graphite ring is impregnated with some high temperature resistant and anti-oxidation materials to enhance its antioxidant capacity and corrosion resistance. The impregnating material can be a metal salt solution or an organic compound solution, etc.

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