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       The definition of compaction: in a mold or other container, under the action of external force, the process of compacting powder into a prescribed shape and size.

 

Pressing process

 

process: pressing-drying-processing and cleaning

 

The pressing process includes four steps of weighing, charging, pressing and demolding. Weighing can be done by gravimetric method or volumetric method. Drying of the green compact When rubber is used as the forming agent, in order to completely remove the residual gasoline and moisture in the green compact to improve the strength of the green compact and eliminate the internal stress of the compact, the green compact must be dried and paraffin wax is used as the forming agent. It should not be dried, because paraffin wax has a low melting point, it will penetrate to the surface of the compact during the drying process, which will reduce the strength of the compact. Drying is generally carried out in a steam drying cabinet or an electric drying cabinet. The drying temperature is generally 100~130℃, and the drying time is 12~48. For high efficiency, infrared drying can also be used. At this time, a higher temperature (150 ~200℃) and a shorter time (0.5~1 hour). Processing and cleaning of compacts Some cemented carbide products are not suitable to be directly pressed into product shapes at one time, which requires processing of compacts after drying (such as chamfering, beveling and round corners). This kind of processing is usually carried out on a "universal grinder" with a 150-mesh silicon carbide grinding wheel. The cleaning is mainly to use emery cloth and felt to remove the brushes, sticky materials, etc. on the surface of the compact, and to repair slight gaps and corners, and finally check the shape and size of the compact, and whether there are pressing defects.




Wococarbide

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