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Hot extrusion, cooling and electric spark machining process of tungsten steel mold

Aug 25, 2018

During the processing of tungsten steel molds, a series of processing techniques, such as hot extrusion, cooling, and electric processing, are involved, and the operation modes are also various. When the tungsten steel mold is extruded, the barrel and the extrusion nozzle need to be heated, which is mainly suitable for the molding agent system which needs heating to improve the plasticity during extrusion.

 

With the wide application of advanced technologies such as photoelectric control technology and microprocessor technology in the extruder, the automation degree and production efficiency of the extruder are increasing. If the porous mold technology is adopted, the menstrual pad technology is adopted to make the extrusion of the small-diameter high-precision spiral hole rod possible, and the double tilt technology is adopted to make the feeding operation more convenient.

 

In order to obtain good alloy properties of the tungsten steel mold, the cooling rate should be as fast as possible, and the cooling process is roughly divided into two stages, from the sintering temperature to about 1000, the first stage, and natural cooling. Argon gas is introduced from 1000, the cooling valve and the cooling fan are turned on, and the charge is forcedly cooled, and the cooling is continued until the temperature is less than 100, which is the second stage.

 

When tungsten steel mold EDM is used, it is generally necessary to remove excess metal in the tungsten steel mold cavity by mechanical processing, leaving less margin and then performing spark electrode processing. EDM can process small holes with difficult cutting, narrow slits or parts with lettering, and has high processing precision. It is suitable for processing cavities with inlaid structure. If the surface roughness after wire cutting cannot meet the requirements, it needs Polishing the cavity.

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